JP5176975B2 - Stator coil shape inspection method and shape inspection jig - Google Patents

Description

  The present invention relates to a stator coil shape inspection method suitably used for a stator coil that constitutes a vehicle drive motor mounted on, for example, a hybrid vehicle or an electric vehicle, and a shape inspection jig used for stator coil shape inspection. About.

  For example, some motors mounted on automobiles have a configuration in which a stator coil is covered with a case made of aluminum or the like. Here, the stator coil is obtained by winding a plurality of coils around a stator core (stator core). Specifically, the stator core constituting the stator coil has, for example, an annular outer shape and a plurality of teeth (inner teeth) on the inner side. A coil is inserted into a slot formed between adjacent teeth and wound around the stator core. For example, in the case of a three-phase motor, a U-phase coil, a V-phase coil, and a W-phase coil are provided, and these phase coils are inserted into predetermined slots and wound around teeth. In the stator coil configured as described above, coil ends, which are coil portions, are formed on the top and bottom (front and back) of the stator core. The coil end portion is a portion covered by the case in the motor.

  In the motor having such a configuration, from the viewpoint of ensuring insulation between the coil end portion of the stator coil and the case covering the stator coil, the shape of the coil end portion of the stator coil is examined (hereinafter referred to as the coil end portion). "Coil end shape inspection") may be performed. That is, in the coil end shape inspection, it is determined whether or not the shape (outer shape) of the coil end with respect to the case having a predetermined shape is a shape that secures a space necessary for insulation between the case and the coil end. Is done.

  In such coil end shape inspection, use of a technique for measuring a three-dimensional shape of an object, called a light cutting method, has been studied. In the light cutting method, a workpiece (measuring object) is irradiated with slit light (slit light by laser light or the like). On the surface of the workpiece irradiated with the slit light, a light cutting line (bright line of reflected light) is formed according to the cross-sectional shape. The light cutting line formed on the surface of the workpiece is received and imaged by imaging means such as a camera. Based on the imaged light cutting line, the principle of triangulation is used to measure the three-dimensional coordinates of each point on the surface of the workpiece (on the light cutting line). Such measurement is performed while the slit light is scanned (scanned) with respect to the workpiece, whereby the three-dimensional shape of the workpiece is measured.

  When such a light cutting method is used for coil end shape inspection, for example, inspection in the following manner is performed. That is, the stator coil serving as a work has a substantially annular shape including a coil end portion. For this reason, the stator coil is supported so as to be rotatable about the central axis in the substantially annular shape when the coil end shape is inspected. On the other hand, a plurality of measuring instruments including a configuration for irradiating slit light, such as a laser projector, and a configuration for imaging a light cutting line, such as a camera, are used for, for example, stator coils on the front side and the back side of the stator core. And installed in a predetermined location.

  Then, the irradiation of the slit light to the coil end and the imaging of the light cutting line formed on the surface of the coil end by the irradiation of the slit light are performed at a certain position with respect to the rotating stator coil (with respect to a predetermined position). The scanning position of the irradiated slit light is relatively changed by the rotation of the stator coil. Thereby, irradiation of slit light and imaging of a light cutting line are performed over the entire circumference of the coil end portion.

  In such coil end shape inspection, there are measurement error due to an error in the mounting position of the measuring instrument, a dimensional error of the measuring instrument, a phenomenon that may occur in the structure of the stator coil transport mechanism (rotating mechanism), and the like. This may cause problems such as detection omissions. Note that the dimensional error of the measuring instrument can be evaluated by using, for example, a block gauge if the measuring instrument attached to the predetermined place in the inspection facility is removed from the facility side. However, it is difficult to evaluate a dimensional error of the measuring instrument if the measuring instrument is attached to a predetermined place in the inspection facility.

  Further, a phenomenon that may occur structurally in the stator coil transport mechanism as a cause of measurement error is a shift of the rotational axis with respect to the stator coil transport mechanism. The deviation of the rotational axis of the stator coil can be evaluated by a physical method using a dial gauge or the like, for example. However, the measured value of the deviation of the rotational axis due to the dial gauge or the like does not necessarily match the measurement error in the measuring instrument caused by the deviation of the rotational axis. In other words, the evaluation of the deviation of the rotational axis by a physical method using a dial gauge or the like is unlikely to be an evaluation of the entire inspection facility including the stator coil transport mechanism and the measuring instrument. For this reason, according to a physical method using a dial gauge or the like, the measurement error of the entire inspection facility based on the deviation of the rotation axis of the stator coil is unclear.

  Patent Document 1 discloses a technique for detecting a shift in the angle and position of a measuring instrument such as an image sensor in an inspection system based on an optical cutting method. In Patent Literature 1, a marker having a known shape or the like is measured on an inspection facility, whereby a shift in the angle and position of a measuring instrument such as an image sensor is detected.

  Specifically, the marker irradiated with the slit light is detected by the image sensor and displayed on the screen of the display device. Then, based on the deviation of the image on the screen from a predetermined appropriate position, the deviation of the angle of the measuring instrument such as the image sensor and the horizontal / vertical position is detected. By applying such a technique to the coil end shape inspection using the optical cutting method, it may be possible to confirm and evaluate an error in the mounting position of the measuring instrument.

  However, according to the content disclosed in Patent Document 1, relative evaluation between a measuring instrument and a belt conveyor (conveying mechanism) that conveys a measurement object, such as a positional deviation of a measuring instrument such as an image sensor. Only has been done. In other words, in Patent Document 1, a displacement of the measuring instrument is detected on the assumption that the marker measured as described above is always at the same position in relation to the transport mechanism. For this reason, in the technique of Patent Document 1, it can be said that the measurement error due to the uncertainty of the transport mechanism itself is unexpected. Moreover, in the technique of patent document 1, the dimensional error which a measuring instrument has is not considered.

  As described above, in the coil end shape inspection using the optical cutting method, an error in the mounting position of the measuring instrument, a dimensional error of the measuring instrument, and a phenomenon that may occur due to the structure of the stator coil transport mechanism (rotating mechanism) There is a need for a method for confirming and evaluating measurement errors caused by the above.

JP-A-8-75435

  The present invention has been made in view of the problems as described above, and the problem to be solved is that, in the shape inspection by the optical cutting method, it is not necessary to remove the measuring instrument from the inspection equipment, and the inspection. An object of the present invention is to provide a stator coil shape inspection method and a shape inspection jig capable of confirming and evaluating errors in inspection facilities that affect accuracy.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, a captured image of reflected light obtained by irradiating a target object with slit light is a stator coil having a stator core and a coil end formed by a coil wound around the stator core. Based on the captured image acquired for each part of the stator coil by continuously changing the scanning position of the slit light with respect to the stator coil by using the obtained light cutting method, the quality determination of the shape of the coil end part is made A method for inspecting a shape of a stator coil that performs surface processing suitable for acquisition of the captured image, and that protrudes in a substantially annular shape with respect to a predetermined reference surface following the shape of the coil end with respect to the stator core Using a shape inspection jig having a coil end portion formed as: A ridge line portion between a first shape portion that is a shape portion that forms a slit along a plane passing through a center line determined for the coil end portion, and an end surface portion on the protruding direction side of the coil end portion and a peripheral surface portion along the protruding direction And a second shape portion that is a shape portion that forms a vertex in a cross-sectional shape along a plane passing through the center line, and the shape inspection jig has a shape of the shape of the coil end portion. In the state set in the same manner as the stator coil to be inspected, the first shape portion is used to adjust the irradiation position of the slit light on the basis that the slit light overlaps the slit, and the first The front in the image about the second shape portion in the captured image obtained by the light cutting method using the second shape portion and the target object as the shape inspection jig As a reference the position corresponding to the vertex overlaps the position of the center of the imaging device for acquiring the captured image, and performs adjustment of the imaging position of the captured image.

  In the stator coil shape inspection method according to claim 2, in the stator coil shape inspection method according to claim 1, the second shape portion may be the apex portion of the ridge line on each of the inner peripheral side and the outer peripheral side of the coil end portion. It is formed at the part.

  The stator coil shape inspection method according to claim 1 or 2, wherein the shape inspection jig includes a plurality of plane portions perpendicular to the slit light irradiation direction. It further has a third shape portion which is a shape portion formed with a known dimension in the light irradiation direction, and the third shape portion is used, and the target object is the shape inspection jig. The captured image is obtained by comparing the dimension between the plurality of plane portions in the image of the third shape portion in the captured image obtained by the light cutting method and the known dimension between the plurality of plane portions. The dimensions are adjusted.

  According to a fourth aspect of the present invention, in the shape inspection method for a stator coil according to the third aspect, the third shape portion forms the plurality of flat portions on each of an inner peripheral side and an outer peripheral side of the coil end portion. It is.

  5. The stator coil shape inspection method according to claim 1, wherein the shape inspection jig has a cross-sectional shape along a plane passing through the center line for the shape inspection. It further has a fourth shape portion that is a constant shape portion over the entire circumference of the jig, and is obtained by the optical cutting method using the fourth shape portion and using the target object as the shape inspection jig. The shape inspection for continuously changing the scanning position of the slit light with respect to the shape inspection jig based on variations in measurement points for forming an image of the fourth shape portion in the captured image The amount of eccentricity with respect to rotation in which the direction along the center line, which is the movement of the jig, is the rotation axis direction is grasped.

  According to a sixth aspect of the present invention, in the stator coil shape inspection method according to the fifth aspect, the shape inspection jig is set in the same manner as the stator coil in which the shape of the coil end portion is inspected. In addition, at least one of the scanning of the slit light with respect to the shape inspection jig is performed a plurality of times with the acquisition of the measurement points, thereby measuring variations in the measurement points.

  In a seventh aspect of the present invention, in the shape inspection method for the stator coil according to the fifth or sixth aspect, the shape inspection jig has a maximum outer shape allowed as a non-defective product with respect to the outer shape of the coil end portion. A light cutting formed on the surface of the fifth shape portion obtained by the light cutting method further including a fifth shape portion which is a shape portion to be formed and having a target object as the shape inspection jig. A reference measurement point group, which is a set of measurement points in the captured image that captures a line, is moved in the direction of reducing the maximum outer shape based on variations in the measurement points, and becomes a determination criterion in the quality determination Created as reference data and captured the light cutting line formed on the surface of the coil end portion obtained by the light cutting method using the target object as the stator coil The actual measurement point is the measurement point in the serial captured image, by comparing with the reference data, and performs the quality judgment.

  According to an eighth aspect of the present invention, a captured image of reflected light obtained by irradiating a target object with slit light is obtained by using a stator coil having a stator core and a coil end formed by a coil wound around the stator core as an inspection object. Based on the captured image acquired for each part of the stator coil by continuously changing the scanning position of the slit light with respect to the stator coil using an optical cutting method, the quality of the shape of the coil end part is determined. A jig for shape inspection used in a shape inspection method of a stator coil, which is subjected to a surface treatment suitable for acquisition of the captured image, and substantially follows a predetermined reference surface following the shape of the coil end with respect to the stator core. The coil end has a coil end portion formed as an annular projecting portion. The center at the ridge line portion between the first shape portion that is a shape portion that forms a slit along a plane passing through the center line determined with respect to the end surface portion on the protruding direction side of the coil end portion and the peripheral surface portion along the protruding direction A second shape portion that is a shape portion forming a vertex in a cross-sectional shape along a plane passing through a line, and is set in the same manner as the stator coil in which the shape of the coil end portion is inspected The first shape portion is used, the slit light irradiation position is adjusted based on the fact that the slit light overlaps the slit, the second shape portion is used, and the light cutting An imaging element for acquiring the captured image at a position corresponding to the vertex in the image of the second shape portion in the captured image acquired by being a target object of the method Based on the overlap in the position of the center of the one in which the adjustment of the imaging position of the captured image is performed.

  The shape inspection jig according to claim 8, wherein the second shape portion includes the ridge line portions on the inner peripheral side and the outer peripheral side of the coil end portion. Is formed.

  In a tenth aspect of the present invention, in the shape inspection jig according to the eighth or ninth aspect, the shape inspection jig includes a plurality of plane portions perpendicular to the irradiation direction of the slit light. A third shape portion that is a shape portion that is formed with a known dimension in the irradiation direction, and the third shape portion is used as a target object of the light cutting method. Adjustment of the dimension in the captured image by comparing the dimension between the plurality of plane portions in the image of the third shape portion in the acquired captured image with the known dimension between the plurality of plane portions. Is done.

  In the eleventh aspect of the present invention, in the shape inspection jig according to the tenth aspect, the third shape portion forms the plurality of planar portions on each of an inner peripheral side and an outer peripheral side of the coil end portion. is there.

  The shape inspection jig according to any one of claims 8 to 11, wherein the shape inspection jig has a cross-sectional shape along a plane passing through the center line. The imaging obtained by further having a fourth shape portion that is a constant shape portion over the entire circumference of the tool, and using the fourth shape portion as a target object of the light cutting method The shape inspection jig for continuously changing the scanning position of the slit light with respect to the shape inspection jig based on variations in measurement points for forming an image of the fourth shape portion in the image. The amount of eccentricity with respect to rotation in which the direction along the center line, which is movement, is the rotation axis direction is grasped.

  According to claim 13, in the shape inspection jig according to claim 12, the shape inspection jig is set in the same manner as the stator coil in which the shape of the coil end portion is inspected. In addition, at least one of the scanning of the slit light with respect to the shape inspection jig is performed a plurality of times with the acquisition of the measurement points, whereby the variation of the measurement points is measured.

  14. The shape inspection jig according to claim 12 or claim 13, wherein the shape inspection jig forms a maximum outer shape allowed as a non-defective product with respect to the outer shape of the coil end portion. And a light cutting line formed on the surface of the fifth shape portion obtained by being a target object of the light cutting method. The reference measurement point group that is a set of measurement points in the captured image is moved in the direction of reducing the maximum outer shape based on the variation of the measurement points, as reference data that becomes a determination criterion in the quality determination The captured image obtained by capturing the light cutting line formed on the surface of the coil end portion created and obtained by the light cutting method using the target object as the stator coil Actual measurement point is kicking measurement points, by being compared with the reference data, in which the quality determination is performed.

As effects of the present invention, the following effects can be obtained.
That is, according to the present invention, in the shape inspection by the light cutting method, it is possible to confirm and evaluate the error of the inspection equipment that affects the inspection accuracy without requiring removal of the measuring instrument from the inspection equipment.

The figure which shows the structure of the shape inspection apparatus which concerns on one Embodiment of this invention. The figure which similarly shows the general view of a shape inspection apparatus. The figure which shows an example of a two-dimensional image. The perspective view which shows a master work. The figure which shows the measurement state about the slit part of a masterwork. The figure which shows the measurement state about the vertex formation part of a masterwork. The figure which shows the slit image about a vertex formation part. The figure which shows the preferable form about a vertex formation part. The figure which shows the measurement state about the level | step-difference part of a master work. The figure which shows the slit image about a level | step-difference part. The figure which shows the preferable form about a level | step-difference part. The figure which shows the measurement state about the cyclic | annular part of a master work. The figure which shows the slit image about an annular part. The B partial enlarged view in FIG. Explanatory drawing about creation of a coil end tolerance shape. The flowchart which shows an example of the creation flow of the coil end tolerance shape including the accuracy confirmation in a test | inspection facility. The figure which shows one Example of a master work.

  In the shape inspection of the stator coil constituting the motor, the present invention uses an optical cutting method to determine whether the shape of the coil end portion is good or not, and has an actual shape having a good shape as a determination criterion (a comparison target). Instead of a workpiece, a master workpiece which is a workpiece for a determination standard having a predetermined shape or the like is used. Then, by including a predetermined shape portion in the master work, the master work is intended to be used as a jig for the arrangement of measuring instruments in the shape inspection by the optical cutting method. Embodiments of the present invention will be described below.

  As shown in FIGS. 1 and 2, a stator coil shape inspection apparatus (hereinafter simply referred to as “shape inspection apparatus”) 1 according to the present embodiment uses a stator coil 10 as an inspection object (workpiece). The stator coil 10 has a stator core 10a and a coil end 10b formed by a coil wound around the stator core 10a. The stator coil 10 has a substantially annular shape as a whole. The stator coil 10 of the present embodiment constitutes a three-phase motor for driving a vehicle mounted on an automobile or the like.

  The stator core 10a has an annular outer shape and a plurality of teeth (inner teeth) on the inside thereof. A coil is inserted into a slot formed between adjacent teeth and wound around the stator core 10a. Since the stator coil 10 of the present embodiment constitutes a three-phase motor as described above, a U-phase coil, a V-phase coil, and a W-phase coil are provided, and the coils of these phases are inserted into predetermined slots. Is wound around the teeth. In the stator coil 10 configured as described above, coil ends 10b that are coil portions are formed above and below (front and back) the stator core 10a (see FIG. 2). In the stator coil 10, the coil end 10 b is covered with a case (not shown) to constitute a motor.

  In the motor having the above-described configuration, the shape inspection apparatus 1 is configured with respect to the stator coil 10 from the viewpoint of ensuring insulation between the coil end 10b portion of the stator coil 10 and the case covering it. The shape of the end 10b is inspected. That is, in the shape inspection apparatus 1, whether or not the shape (outer shape) of the coil end 10b with respect to the case having a predetermined shape is such that a necessary space for insulation between the case and the coil end 10b is ensured. Is judged (good or bad judgment).

  The shape inspection apparatus 1 uses an optical cutting method for acquiring a two-dimensional image that is a captured image of reflected light obtained by irradiating the target object with the slit light 11 when determining the quality of the coil end 10 b of the stator coil 10. Use. Therefore, the shape inspection apparatus 1 includes an apparatus configuration for performing the light cutting method.

  That is, as shown in FIG. 1, the shape inspection apparatus 1 according to the present embodiment includes a laser projection unit 2 as an irradiating unit, a camera 3 as an imaging unit, and a calculation control unit 5 as a calculation unit. Device 4.

  The laser projector 2 uses the stator coil 10 that is an inspection object (work) as an object to be irradiated with the slit light 11, and irradiates the stator light 10 with the slit light 11. The laser projector 2 is configured as a laser output unit having a laser transmitter, a cylindrical lens (cylindrical lens), or the like, which is a light source of laser light such as an infrared semiconductor laser.

  That is, in the laser projector 2, laser light emitted from the laser transmitter is converted into slit light (laser sheet) 11 by passing through a cylindrical lens (not shown). Then, the slit light 11 projected from the laser projector 2 is irradiated to the stator coil 10. A light cutting line (bright line of reflected light) 12 is formed on the surface of the stator coil 10 irradiated with the slit light 11 from the laser projector 2 in accordance with the cross-sectional shape thereof.

  The camera 3 images reflected light obtained by irradiating the stator coil 10 with the slit light 11 by the laser projector 2. That is, the camera 3 images the light cutting line 12 formed on the surface of the stator coil 10 by the slit light 11 irradiated by the laser projector 2.

  The camera 3 is a light receiving sensor that receives a laser beam (reflected light) reflected by the light cutting line 12, that is, the surface of the stator coil 10, and is configured by an imaging element such as a CCD image sensor or a CMOS image sensor. The camera 3 receives the light cutting line 12 formed on the surface of the stator coil 10 and picks up an image thereof, whereby an image of the light cutting line 12 (hereinafter also referred to as “slit image”) of the imaging element. Obtained as a two-dimensional image 13 (see FIG. 3) on the imaging surface. The camera 3 includes a light receiving lens (not shown) that receives reflected light from the surface of the stator coil 10 when the light cutting line 12 is imaged on the imaging surface.

  The camera 3 is arranged in a state where the optical axis (light receiving axis) is shifted by a predetermined angle with respect to the irradiation direction (light projecting axis direction) of the slit light 11 from the laser light projecting unit 2. Image data about the optical cutting line 12 imaged by the camera 3 is sent to the control device 4.

  The arithmetic control unit 5 provided in the control device 4 measures the three-dimensional coordinates of each point on the light cutting line 12 from the two-dimensional image 13 including the light cutting line 12 imaged by the camera 3. That is, the arithmetic control unit 5 is based on the image data of the two-dimensional image 13 captured by the camera 3, the position of the laser projector 2, the position of the lens center of the light receiving lens, and the surface of the stator coil 10. From the incident angle of the reflected light to the camera 3 and the like, the three-dimensional coordinates of each point (irradiation point) on the light cutting line 12 on the surface of the stator coil 10 are measured by the principle of triangulation.

  That is, the three-dimensional coordinates of each point on the light cutting line 12 become measurement data (position data corresponding to the cross-sectional shape of the coil end 10b) by the arithmetic control unit 5. The contour line of the coil end 10b is measured by the measurement data for one light cutting line 12.

  Then, the arithmetic control unit 5 acquires a two-dimensional image 13 that is a captured image of reflected light obtained by irradiating the stator coil 10 with the slit light 11, and based on the two-dimensional image 13, the coil end 10 b is obtained. The shape quality determination (hereinafter also referred to as “shape quality determination”) is performed. That is, the arithmetic control unit 5 uses data (reference data) as a determination criterion that is set in advance when determining the quality of the shape as will be described later as a comparison target of measurement data for the stator coil 10 that is an inspection object. The quality of the shape is determined by comparison. By determining whether the shape is good or bad, it is determined whether the stator coil 10 is a good product or a defective product.

  The position of the slit light 11 applied to the stator coil 10 is scanned (scanned) and updated at predetermined intervals. Thereby, the two-dimensional image 13 including the optical cutting line 12 corresponding to each scanning position (irradiation position) of the slit light 11 with respect to the stator coil 10 is obtained. That is, the arithmetic control unit 5 continuously obtains measurement data at each scanning position (irradiation position) of the slit light 11 with respect to the stator coil 10.

  When scanning the slit light 11 with respect to the stator coil 10, the shape inspection apparatus 1 according to the present embodiment has the following configuration. As shown in FIG. 1, in the shape inspection apparatus 1 of this embodiment, the laser projector 2 and the camera 3 are accommodated in the case 6 in a predetermined positional relationship. That is, the laser projector 2 and the camera 3 are housed in the case 6 and configured as a light cutting scanner 7 that is an integral unit.

  As shown in FIG. 2, the shape inspection apparatus 1 according to the present embodiment includes four light cutting scanners 7 (7a, 7b, 7c, 7d). Two of these four optical cutting scanners 7 are provided for each of coil ends 10b formed vertically on the stator coil 10 via the stator core 10a (up and down in FIG. 2, the same applies hereinafter). In addition, the two optical cutting scanners 7 provided for the upper and lower coil ends 10b are arranged such that one optical cutting scanner 7 is provided from the outside and the other optical cutting scanner 7 is provided for the coil end 10b having a substantially annular shape. Irradiates slit light 11 from the inside.

  Specifically, as shown in FIG. 2, the shape inspection apparatus 1 according to the present embodiment includes four light cutting scanners 7 a, 7 b, 7 c, and 7 d as the light cutting scanner 7. The light cutting scanner 7a irradiates the upper coil end 10b with the slit light 11 from obliquely upward on the outside. Similarly, the optical cutting scanner 7b irradiates the upper coil end 10b with the slit light 11 obliquely from above. The optical cutting scanner 7c irradiates the lower coil end 10b with the slit light 11 obliquely from the outside. Similarly, the light cutting scanner 7d irradiates the lower coil end 10b with the slit light 11 from obliquely below the inner side.

  The slit light 11 irradiated by these four optical cutting scanners 7 has a circumferential direction of the stator coil 10 as a scanning direction with respect to the stator coil 10 having a substantially annular shape as a whole. In the present embodiment, in the relationship between the stator coil 10 and the light cutting scanner 7, the stator coil 10 rotates about the central axis direction in the substantially annular shape as the rotation axis direction, so that the slit light 11 is relative to the stator coil 10. Scanned.

  The portion of the stator coil 10 that is irradiated with the slit light 11 is a portion that includes at least the portion of the coil end 10b where the quality determination is performed. Accordingly, the slit light 11 is sequentially applied to at least the entire coil end 10b by rotating the stator coil 10 in a state where the slit light 11 is irradiated to the stator coil 10 by the four light cutting scanners 7. Will be irradiated.

  The stator coil 10 and the optical cutting scanner 7 are supported with respect to the support device 20. The support device 20 includes a support base 21 configured in a flat plate shape. The support base 21 is supported at a predetermined height position so as to be substantially parallel to the floor surface or the like by a columnar leg portion 22 provided on a plate surface on one side (lower side) thereof. The stator coil 10 is rotatably supported with respect to the support base 21. The stator coil 10 is supported on the support base 21 so as to be rotatable with the central axis direction as the rotation axis direction as described above by a rotation drive mechanism using, for example, a motor as a drive source (see arrow A).

  The stator coil 10 is supported with respect to the support base 21 such that the upper and lower coil ends 10b are exposed on the upper side and the lower side of the support base 21, respectively. That is, the stator coil 10 is supported with respect to the support base 21 in a state of passing through the support base 21 in the vertical direction. Optical cutting scanners 7a and 7b (hereinafter also referred to as “upper optical cutting scanners 7a and 7b”) disposed on the upper side of the support base 21 are provided for the coil end 10b exposed on the upper side of the support base 21. The optical cutting scanners 7c and 7d (hereinafter also referred to as “lower optical cutting scanners 7c and 7d”) disposed on the lower side of the support base 21 with respect to the coil end 10b exposed on the lower side of the support base 21. Provided.

  The upper light cutting scanners 7 a and 7 b are supported by an upper support stay 24 provided in the support device 20. The upper support stay 24 is provided on the upper surface side of the support base 21. For example, as shown in FIG. 2, the upper support stay 24 includes two column portions 24 a erected with respect to the upper surface of the support base 21, and a beam portion 24 b that connects these at the upper end portion of each column portion 24 a. And is configured in a substantially gate shape as a whole. With respect to the upper support stay 24, the upper light cutting scanners 7a and 7b are appropriately arranged so as to have a predetermined posture with respect to the stator coil 10 supported by the support base 21 in accordance with the irradiation direction of the slit light 11. It is supported by the method.

  The lower light cutting scanners 7c and 7d are arranged and supported by the same configuration as that of the upper light cutting scanners 7a and 7b on the lower side of the support base 21. That is, the lower light cutting scanners 7c and 7d are provided on the lower support stay 25 which is provided on the lower side of the support base 21 and has two pillar portions 25a and a beam portion 25b and is configured in a substantially gate shape as a whole. The stator coil 10 is supported in a predetermined posture.

  In this manner, the stator device 10 and the support device 20 that supports the four light cutting scanners 7 scan the stator light 10 with the slit light 11 irradiated from each light cutting scanner 7. That is, the slit light 11 is rotated by rotating the stator coil 10 supported by the support base 21 in a state where the slit light 11 is irradiated from each light cutting scanner 7 supported in a predetermined posture in the support device 20. The scanning position (irradiation position) of the stator coil 10 is continuously changed in the circumferential direction of the stator coil 10.

  Thereby, the two-dimensional image 13 about each scanning position of the slit light 11 which is irradiated with respect to the stator coil 10 and is updated at predetermined intervals while being scanned in the circumferential direction is acquired. That is, the two-dimensional image 13 including the light cutting line 12 reflecting the cross-sectional shape of each part of the stator coil 10 is acquired at each scanning position of the slit light 11 updated a predetermined number of times (for example, about 2,000 times). The

  Note that the configuration for scanning the slit light 11 with respect to the stator coil 10 is not limited to the present embodiment. When scanning the slit light 11, for example, a configuration including a mirror that is rotatably provided and reflects the slit light 11 may be used. In such a configuration, the reflection direction of the slit light 11 by the mirror is deflected by the angle of the mirror, so that the slit light 11 is scanned with respect to the stator coil 10.

  Further, in the present embodiment, a configuration in which the stator coil 10 side moves (rotates) is employed as a configuration for scanning the slit light 11 with respect to the stator coil 10, but the configuration is not limited thereto. That is, at least one of the stator coil 10 and the light cutting scanner 7 is movably provided so that the slit light 11 irradiated to the stator coil 10 moves in the scanning direction relative to the stator coil 10. If it is. In the present embodiment, the number of the four light cutting scanners 7 provided is not particularly limited. That is, the shape inspection apparatus 1 may be provided with one or more light cutting scanners 7.

  The control device 4 includes an input unit 14 and a display unit 17 in addition to the calculation control unit 5 that measures the three-dimensional shape of the stator coil 10.

  The arithmetic control unit 5 controls a series of operations of the shape inspection apparatus 1. The calculation control unit 5 includes a storage unit that stores a program and the like, a development unit that expands the program and the like, a calculation unit that performs a predetermined calculation according to the program, a storage unit that stores a calculation result and the like by the calculation unit, and the like.

  Specifically, a configuration in which a CPU, a ROM, a RAM, an HDD, or the like is connected by a bus, or a configuration that includes a one-chip LSI or the like is used as the arithmetic control unit 5. As the arithmetic control unit 5, in addition to a dedicated product, a commercially available personal computer, a workstation, or the like in which the above program is stored is used.

  The input unit 14 is connected to the calculation control unit 5 and inputs various information / instructions related to the operation of the shape inspection apparatus 1 to the calculation control unit 5. As the input unit 14, a commercially available keyboard, mouse, pointing device, button, switch or the like is used in addition to a dedicated product.

  The display unit 17 is connected to the calculation control unit 5, and displays the operation status of the shape inspection apparatus 1, the input content from the input unit 14 to the calculation control unit 5, the inspection result by the shape inspection apparatus 1, and the like. The display content by the display unit 17 includes a slit image 15 that is an image of the light cutting line 12. As the display unit 17, in addition to a dedicated product, a commercially available monitor, a liquid crystal display, or the like is used.

  As described above, the shape inspection apparatus 1 according to the present embodiment uses the stator coil 10 as an inspection object, and uses the optical cutting method to continuously change the scanning position of the slit light 11 with respect to the stator coil 10. Based on the two-dimensional image 13 acquired for each of the ten parts, the shape quality determination is performed.

  A stator coil shape inspection method (hereinafter simply referred to as “shape inspection method”) according to the present embodiment, which is performed using the shape inspection apparatus 1 having the above-described configuration, will be described. The shape inspection method according to the present embodiment is obtained for each part of the stator coil 10 by continuously changing the scanning position of the slit light 11 with respect to the stator coil 10 using the optical cutting method with the stator coil 10 as an inspection object. Based on the two-dimensional image 13, the quality of the shape is determined.

  In the shape inspection method according to the present embodiment, a master work 30 (see FIG. 4) different from the stator coil 10 as an actual work is used to acquire and create reference data that is a determination reference in shape quality determination. . That is, by comparing the reference data acquired / created using the master work 30 with the measurement data acquired for the stator coil 10 as the inspection object, the shape quality determination for the stator coil 10 is made. Done.

  As shown in FIG. 4, the master work 30 in the present embodiment as a whole has a schematic outer shape with respect to the outer shape of the stator coil 10 that is an actual work. Therefore, the master work 30 is formed on the stator core portion 31 corresponding to the stator core 10a of the stator coil 10 and on both sides in the vertical direction (substantially annular central axis direction) with respect to the stator core portion 31. And a coil end portion 32 which is a portion corresponding to the coil end 10b.

  In the drawings showing the master work 30 such as FIG. 4 used in the following description, one end (upper side) of the coil end portions 32 respectively formed on the upper and lower sides of the stator core portion 31 in the master work 30 is shown. Only the part 32 is illustrated in detail. However, the upper and lower coil end portions 32 have the same shape with respect to the stator core portion 31 (for example, a shape that is symmetrical up and down via the stator core portion 31).

  Further, the upper coil end portion 32 of the stator core portion 31 is related to the upper light cutting scanners 7a and 7b, and the lower coil end portion 32 is related to the lower light cutting scanners 7c and 7d. And the relationship with respect to the coil end part 32 of each optical cutting scanner 7 is also the same. Therefore, in the following, description will be given using the light cutting scanner 7 (upper light cutting scanners 7a and 7b) arranged on one side (upper side), and one of the light cutting scanners 7 arranged on the same side in the vertical direction. Alternatively, the description of the optical cutting scanner 7 (lower optical cutting scanners 7c and 7d) arranged on the other side (lower side) will be omitted as appropriate.

  The stator core portion 31 has an annular outer shape formed by an outer peripheral surface portion 31a that forms a substantially cylindrical outer peripheral surface and end surface portions 31b that form an annular flat surface positioned above and below the outer peripheral surface portion 31a. The stator core portion 31 is a large-diameter portion of the stator coil 10 having a substantially annular shape as a whole. Coil end portions 32 are formed on the upper and lower end surface portions 31 b of the stator core portion 31.

  In the stator core portion 31, a plurality of bolt boss portions are provided on the outer peripheral surface portion 31a (see FIG. 17, bolt boss portion 31c). The bolt boss portion is a portion corresponding to a bolt boss portion (not shown) provided on the stator core 10 a in the stator coil 10. The bolt boss portion has a bolt hole for attaching the case.

  The bolt boss portion of the master work 30 is used when the master work 30 is set in the same manner as the stator coil 10 in which the shape of the coil end 10b is inspected. That is, the master work 30 is set in a state in which the master work 30 is positioned at the same position and posture as the stator coil 10 with respect to the support base 21 having the rotation drive mechanism using the bolt boss portion provided on the outer peripheral surface portion 31a. Moreover, the bolt boss part which the master work 30 has is used also as the position reference | standard of the coordinate of the measurement point in the two-dimensional image 13, etc. about the master work 30, for example.

  The coil end portions 32 formed above and below the stator core portion 31 are portions that simulate the portion of the coil end 10 b of the stator coil 10. The coil end portion 32 is formed as a substantially annular projecting portion from the upper and lower end surface portions 31 b of the stator core portion 31 with respect to the stator core portion 31. Each coil end portion 32 includes, in part, a limit shape portion 55 that is a shape portion having a maximum outer shape predetermined with respect to the outer shape of the coil end 10 b of the stator coil 10.

  Therefore, in the master work 30, the limit shape part 55 which each coil end part 32 has becomes a shape part which forms the maximum outer shape allowed as a non-defective product with respect to the outer shape of the coil end 10b. Here, the maximum outer shape allowed as a non-defective product included in the coil end portion 32 is set so that insulation in relation to the case attached to the stator coil 10 is sufficiently secured, and the limit of the portion of the coil end 10b is set. It corresponds to the external shape of. That is, the limit shape portion 55 defines the limit outer shape of the coil end 10b portion by its cross-sectional shape.

  The outer shape of the coil end portion 32 is simpler than the outer shape of the coil end 10 b of the stator coil 10. Schematically, the coil end portion 32 includes an end surface portion 32a that is a substantially flat surface portion having a substantially annular shape, and a peripheral surface portion formed on each of the inner side (inner peripheral side) and the outer side (outer peripheral side) of the end surface portion 32a. 32b so as to form a substantially annular outer shape as a whole.

  As shown in FIG. 4, the limit shape portion 55 has a plurality of portions having different heights in the circumferential direction. Here, the height of the limit shape portion 55 is defined as, for example, a vertical dimension with respect to the end surface portion 31 b of the stator core portion 31.

  Specifically, the limit shape portion 55 includes, as three types of shape portions having different heights in the circumferential direction, the first shape portion 55a, the second shape portion 55b, and the third shape portion 55c in descending order of height. Have. The cross-sectional shape in the circumferential direction (the cross-sectional shape parallel to the central axis direction and the radial direction) in each part of the first shape portion 55a, the second shape portion 55b, and the third shape portion 55c is the same in each portion. Become.

  In the present embodiment, the first shape portion 55a, the second shape portion 55b, and the third shape portion 55c constituting the limit shape portion 55 are gathered at one place (as a continuous portion) in the coil end portion 32. Although it exists, it may exist separately in the circumferential direction of the coil end part 32. That is, each shape part which comprises the limit shape part 55 may exist via the other part which forms the coil end part 32 in between.

  The master work 30 of the present embodiment has a shape such as a CAD drawing created based on the maximum outer shape set for the limit shape portion 55 as described above, the outer shape of the stator core 10a of the stator coil 10, and the like. It is formed with reference to the design drawing. As a material constituting the master work 30, for example, aluminum or ceramics is used. However, aluminum is preferably used because of its ease of processing and cost advantages.

  The master work 30 is subjected to a surface treatment suitable for obtaining the two-dimensional image 13. The surface treatment suitable for acquisition of the two-dimensional image 13 is a surface treatment suitable for optical measurement by an optical cutting method. That is, the surface treatment is such that the surface of the master work 30 is in a state suitable for extraction of the light cutting line 12 formed by irradiating the slit light 11.

  The extraction of the light cutting line 12 formed on the surface of the master work 30 becomes easier as the luminance difference between the part of the light cutting line 12 (slit image 15) and the background part in the two-dimensional image 13 increases. Therefore, the surface treatment suitable for obtaining the two-dimensional image 13 is such that the reflectance of the surface of the master work 30 is such that the luminance difference between the light cutting line 12 portion and the background portion in the two-dimensional image 13 is relatively large. It can be said that the surface treatment has a value.

  As the surface treatment applied to the master work 30, for example, an appropriate surface treatment such as alumite treatment or shot blasting is used. In addition, the surface treatment given to the master work 30 should just be given to the part of the coil end part 32 corresponding to the coil end 10b which is an object part of a shape inspection at least.

  As described above, the master work 30 used in the shape inspection method of the present embodiment is subjected to a surface treatment suitable for acquisition of the two-dimensional image 13, and follows a predetermined reference surface following the shape of the coil end 10b with respect to the stator core 10a. This is a shape inspection jig having a coil end portion 32 formed as a portion protruding in a substantially annular shape with respect to the end surface portion 31b. And the master work 30 of this embodiment has the limit shape part 55 as a 5th shape part which is a shape part which forms the largest external shape permitted as a good article about the external shape of the part of the coil end 10b.

  By using such a master work 30, reference data serving as a determination reference in the shape pass / fail determination is acquired and created. In other words, in the shape inspection method of the present embodiment, the master work 30 is used, and the optical cutting line 12 formed on the surface of the limit shape portion 55 obtained by the optical cutting method using the target object as the master work 30 is used. Based on a reference measurement point group that is a set of measurement points in the captured two-dimensional image 13, reference data serving as a determination reference in shape quality determination is created.

  In the following, for convenience of explanation, among the four optical cutting scanners 7 included in the shape inspection apparatus 1 of the present embodiment, one light cutting scanner 7 (for example, slit light from the upper obliquely upper side with respect to the upper coil end 10b). 11 will be described with reference to a two-dimensional image 13 which is measurement data acquired by the optical cutting scanner 7a). However, the shape inspection method described below is performed in the same manner for each of the two-dimensional images 13 acquired by the four light cutting scanners 7 included in the shape inspection apparatus 1.

  FIG. 3 shows an example of reference data at a scanning position where the slit light 11 exists. That is, FIG. 3 is an example of the two-dimensional image 13 captured in a state where the slit light 11 is at a certain scanning position with respect to the limit shape portion 55 of the master work 30. Therefore, in the two-dimensional image 13 shown in FIG. 3, there is a slit image 15 that is an image portion of the light cutting line 12 formed on the surface of the limit shape portion 55 in the master work 30.

  The slit image 15 in the two-dimensional image 13 is a set of measurement points for the light cutting line 12 formed on the surface of the master work 30 (the limit shape portion 55 thereof), that is, the reflected light of the slit light 11. Here, the measurement point corresponds to a pixel in the two-dimensional image 13. In the present embodiment, as shown in FIG. 3, in the two-dimensional image 13, the horizontal direction (left-right direction in FIG. 3) is the X-axis direction, and the vertical direction (vertical direction in FIG. The direction is the Z-axis direction. That is, the position in the two-dimensional image 13 of the measurement point existing on the two-dimensional image 13 is specified by the X coordinate and the Z coordinate on the XZ plane.

  The captured image of the optical cutting line 12 formed by the irradiation of the slit light 11 is a linear image, but has a finite width (line thickness) in the two-dimensional image 13. That is, the width of the captured image with respect to the light section line 12 is longer than the length of one pixel (pixel) in the two-dimensional image 13 and covers a plurality of pixels. Therefore, for example, the slit image center line is extracted based on the luminance distribution (distribution of the output level of the image sensor) in the Z-axis direction (vertical direction) in the two-dimensional image 13.

  That is, in the captured image of the light cutting line 12, a pixel (center point) corresponding to the center position in the Z-axis direction is obtained from the luminance distribution in the Z-axis direction by a predetermined method. The set becomes the slit image center line. That is, in the captured image of the light cutting line 12, a center point in the Z-axis direction is obtained for each X coordinate, and this center point becomes a measurement point in the two-dimensional image 13. Therefore, one measurement point in the two-dimensional image 13 exists for each X coordinate corresponding to each pixel. The set of measurement points, that is, the slit image center line corresponds to the slit image 15. The same applies to the two-dimensional image 13 acquired for the stator coil 10 as the inspection object. A set of measurement points (slit image 15) obtained for the master work 30 becomes a reference measurement point group 15a.

  As described above, the reference data acquired by using the master work 30 is based on the slit image 15 obtained for the limit shape portion 55 of the master work 30. For this reason, the reference data forms a boundary that defines an allowable range for the outer shape of the coil end 10 b of the stator coil 10 in the two-dimensional image 13.

  Moreover, as the reference data acquired by using the master work 30, the first shape part 55a, the second shape part 55b, and the third shape part that the limit shape part 55 has as the parts having different heights in the master work 30 are used. The respective portions 55c can be made common regardless of the scanning position of the slit light 11. That is, as described above, since the first shape portion 55a, the second shape portion 55b, and the third shape portion 55c have the same cross-sectional shape in each portion, the reference data used for these portions corresponds to the same reference data. be able to. As described above, since the reference data is shared regardless of the scanning position of the slit light 11 for the portion having the same cross-sectional shape, the data amount as the reference data can be greatly reduced.

  Such creation of reference data is performed by the arithmetic control unit 5 in the shape inspection apparatus 1 of the present embodiment (see FIG. 1). That is, the arithmetic control unit 5 is a set of measurement points in the two-dimensional image 13 that captures the light cutting line 12 formed on the surface of the limit shape portion 55 obtained by the light cutting method using the target object as the master work 30. Based on a certain reference measurement point group 15a, reference data serving as a determination reference in shape quality determination is created. Specifically, the calculation control unit 5 creates reference data by performing a predetermined calculation or the like according to a predetermined program stored in the storage unit. The created reference data is preset and stored in a storage unit or the like in the arithmetic control unit 5.

  Such reference data is used, and the quality of the shape is determined by comparison with measurement data acquired for the stator coil 10. That is, an actual measurement point, which is a measurement point in the two-dimensional image 13 obtained by capturing the optical cutting line 12 formed on the surface of the coil end 10b, obtained by the optical cutting method using the target object as the stator coil 10, The quality of the shape is determined by comparing with the reference data.

  In the shape pass / fail determination, each actual measurement point acquired for the stator coil 10 is compared with reference data. Specifically, in the two-dimensional image 13, it is determined whether or not each actual measurement point is located outside the reference data. Here, “outside” with respect to the reference data means the outside of the region corresponding to the limit shape portion 55 in the two-dimensional image 13. That is, the reference data corresponds to the cross-sectional shape of the limit shape portion 55 at each scanning position of the slit light 11. For this reason, in the two-dimensional image 13, an inner region that is a region corresponding to the limit shape portion 55 and an outer region with respect to the inner region are partitioned through the reference data. Thus, the outer side of the inner region partitioned by the reference data in the two-dimensional image 13 in this way is the outer side of the reference data.

  Whether or not the actual measurement point is located outside the reference data is determined using, for example, the Z coordinate in the two-dimensional image 13. That is, as shown in FIG. 3, in the two-dimensional image 13, the Z coordinate of the reference data (see measurement point MPs) at a certain X coordinate X1 is Z1. In this case, if the Z coordinate of the actual measurement point obtained with respect to the X coordinate X1 is larger than Z1 (see the actual measurement point MP1), it is determined that the actual measurement point is located outside the reference data. Conversely, if the Z coordinate of the actual measurement point obtained with respect to the X coordinate X1 is not greater than Z1 (if it is equal to or less than Z1, refer to the actual measurement point MP2), the actual measurement point is not located outside the reference data. It is determined.

  The determination as to whether or not each actual measurement point is located outside the reference data (hereinafter also referred to as “inside / outside determination”) is all actual measurement points acquired for the stator coil 10, that is, slit light. This is performed for all actual measurement points in all two-dimensional images 13 acquired at each of the 11 scanning positions.

  In the inside / outside determination, when it is determined that all the actual measurement points of the stator coil 10 are not located outside the reference data (positioned inside), the stator coil 10 is determined to be non-defective. On the other hand, among all the actual measurement points for the stator coil 10, an actual measurement point determined to be located outside the reference data is a basis for determining that the stator coil 10 is defective.

  Such shape pass / fail determination is performed by the arithmetic control unit 5 in the shape inspection apparatus 1 of the present embodiment (see FIG. 1). That is, the arithmetic control unit 5 determines the shape quality by comparing the actual measurement points acquired by the light cutting method in which the target object is the stator coil 10 with the reference data created as described above. Specifically, the calculation control unit 5 determines the shape quality by performing a predetermined calculation or the like according to a predetermined program stored in the storage unit.

  According to the shape inspection of the stator coil 10 of the present embodiment as described above, the shape measurement by the light cutting method can be used without causing a decrease in inspection accuracy due to noise or the like caused by multiple reflection of light or the like. As for the shape of the coil end 10b, it is possible to accurately inspect the presence or absence of a shape defect that leads to an insulation failure with respect to the case with nondestructive (non-contact), automatic, and high speed.

  The master work 30 used in the shape inspection method of the present embodiment as described above is used as a jig for the arrangement or the like of the optical cutting scanner 7 in the shape inspection of the stator coil 10. For this reason, the master work 30 has a predetermined shape portion in addition to the limit shape portion 55 used for creating reference data in the shape quality determination. Hereinafter, a predetermined shape portion (hereinafter referred to as “jig shape portion”) of the master work 30 and how to use the jig shape portion will be described.

  As shown in FIG. 4, the master work 30 of the present embodiment includes a slit portion 51 and a vertex forming portion 52 as jig-shaped portions. In the master work 30 of the present embodiment, the slit portion 51 and the vertex forming portion 52 are formed in the coil end portion 32.

  The slit portion 51 is a shape portion that forms a slit 51 a along a plane passing through the center line determined for the coil end portion 32. That is, the coil end part 32 is formed as a part protruding in a substantially annular shape in the master work 30 as described above. Thus, about the part which protrudes in a substantially annular | circular shape, the centerline C1 (refer FIG. 4) as a straight line which passes along the center position of an annular shape becomes settled. The direction of the center line C1 corresponds to the central axis direction in the substantially annular shape of the master work 30. And the slit 51a formed in the slit part 51 follows the plane which passes along the centerline C1.

  Here, the plane passing through the center line C1 along which the slit 51a extends corresponds to a circumferential section (a section parallel to the direction of the center line C1 and the radial direction) of the coil end portion 32. That is, the slit 51a is along the cross section about the cross-sectional shape which should be acquired about the stator coil 10 or the master workpiece 30 by the optical cutting method. Therefore, the slit 51a has a shape along the radial direction (of the coil end portion 32) of the master work 30 when the master work 30 is viewed in the axial direction (direction of the center line C1).

  The slit 51a is formed by surfaces which are substantially parallel to a plane passing through the center line C1 and which are opposed to each other in parallel or substantially in parallel with a slight interval (interval corresponding to the slit width). That is, the slit portion 51 that forms the slit 51 a is a cut portion along a plane perpendicular to the circumferential direction in the coil end portion 32.

  As described above, the master work 30 of the present embodiment is a shape portion that forms the slit 51a along the plane that passes through the center line C1 defined for the coil end portion 32, as the first shape portion as the jig shape portion. It has as a slit part 51.

  The slit part 51 is used for adjusting the irradiation position of the slit light 11 irradiated from the optical cutting scanner 7 (laser projection part 2 thereof). That is, the slit 51a formed in the slit portion 51 is used as an aim of the slit light 11, and the posture of the optical cutting scanner 7 in the installed state (supported in the support device 20, the same applies hereinafter) (support in the support device 20). By adjusting the posture (assembly angle), the irradiation position of the slit light 11 irradiated from the laser projector 2 provided in a state where the optical cutting scanner 7 is positioned at a predetermined position is adjusted. Is called.

  Specifically, the slit portion 51 is used in a state where the master work 30 is set in the same manner as the stator coil 10. That is, when adjusting the irradiation position of the slit light 11 by the slit 51, the master work 30 is the same as the stator coil 10 in which the shape of the coil end 10b is inspected (hereinafter referred to as “coil end shape inspection”). The position and posture are set (hereinafter simply referred to as “set state”).

  And adjustment of the irradiation position of the slit light 11 by the slit part 51 is performed on the basis that the slit light 11 overlaps the slit 51a in the set state of the master work 30. That is, in the optical cutting method in which the three-dimensional shape is grasped (measured) based on the optical cutting line 12 formed according to the cross-sectional shape by being irradiated with the slit light 11, the measurement range (inspection range) is guaranteed. From such a viewpoint, the slit light 11 that is a sheet-like light (laser sheet) is required to be perpendicular to the rotation direction (circumferential direction) of the stator coil 10.

  Therefore, as shown in FIG. 5, the slit light 11 from the light cutting scanner 7 is applied to the slit 51 a in the master work 30 in the set state. Here, the slit light 11 is irradiated such that the direction of the sheet surface is along the direction of the slit surface of the slit 51a (the direction of the surface forming the slit 51a). And the attitude | position of the optical cutting scanner 7 is adjusted so that the slit light 11 may overlap with the slit 51a.

  As shown in FIG. 5, the slit light 11 overlaps the slit 51a, so that the slit light 11 does not form a light cutting line (see the light cutting line 12) on the surface of the coil end part 32 (slit part 51). Then, it enters the slit 51a. That is, the slit light 11 overlapping the slit 51a corresponds to the slit light 11 entering the slit 51a without being reflected on the surface of the coil end portion 32 (slit portion 51).

  Therefore, in the slit portion 51, the slit 51a is formed to have a slit width that allows the slit light 11 to enter. For example, when the sheet thickness at the focal point of the slit light 11 is about 0.1 mm, the slit width of the slit 51a is set to about 1 mm. Here, when setting the slit width of the slit 51a, the distance from the laser projection unit 2 to the irradiation position of the slit light 11 (the surface of the coil end portion 32) or the sheet thickness due to the deviation of the slit light 11 from the focal point. The spread of the above is taken into consideration.

  As described above, the slit portion 51 as the jig-shaped portion of the master work 30 is used, and the irradiation position of the slit light 11 irradiated from the optical cutting scanner 7 is adjusted. That is, by using the slit portion 51, the parallelism between the slit 51 a and the slit light 11 is confirmed along with the adjustment of the posture of the optical cutting scanner 7.

  The apex forming portion 52 is a portion that forms a corner portion at the ridge line portion between the end surface portion 32 a and the peripheral surface portion 32 b that form the coil end portion 32 in the master work 30. That is, the coil end portion 32 is formed so as to have a substantially annular outer shape from the end surface portion 32a which is a substantially annular portion having a substantially annular shape as described above and the peripheral surface portion 32b on the inner peripheral side and the outer peripheral side. Is done. Thus, in the portion having a substantially annular outer shape, a ridge line portion that is a portion where the end surface portion 32a and the peripheral surface portion 32b intersect is formed. And in the vertex formation part 52, the ridgeline part of the end surface part 32a and both the peripheral surface parts 32b is formed as a corner | angular part.

  Here, with respect to the ridge line portion between the end surface portion 32a and the peripheral surface portion 32b, the “corner portion” is a portion having an angular shape by the end surface portion 32a and the peripheral surface portion 32b. That is, the apex forming portion 52 is at least one of an end surface 52a that is a plane that forms a part of the end surface portion 32a of the coil end portion 32, and a peripheral surface portion 32b on each of the inner peripheral side and the outer peripheral side of the coil end portion 32. It is formed by a peripheral surface 52b which is a curved surface forming a part.

  And the vertex formation part 52 is formed, for example so that the direction of the plane of the end surface 52a and the protrusion direction of the peripheral surface part 32b (protrusion direction of the coil end part 32) may become substantially perpendicular | vertical. In this case, the end surface 52a and the peripheral surface 52b form a substantially right-angled corner at the ridge line portion between the end surface portion 32a and the peripheral surface portions 32b. Thus, the corner portion formed at the ridge line portion between the end surface portion 32a and the peripheral surface portion 32b by the vertex forming portion 52 is a cross-sectional shape in the circumferential direction of the coil end portion 32, that is, a plane passing through the center line C1 (FIG. 4). A vertex is formed in a cross-sectional shape along (hereinafter, also simply referred to as “cross-sectional shape”).

  Therefore, as shown in FIG. 6, vertices are formed in the slit image projected on the two-dimensional image 13 obtained by irradiating the vertex forming unit 52 with the slit light 11 on the master work 30 in the set state. The

  Specifically, as shown in FIG. 7, the slit image 16 for the vertex forming portion 52 (the image of the light cutting line 12 formed on the surface of the vertex forming portion 52) is a linear shape corresponding to the end surface 52a. The image part 16a and the linear image part 16b corresponding to the surrounding surface 52b are included. When the end surface 52a and the peripheral surface 52b form a substantially right angle corner as described above, the image portion 16a and the image portion 16b form a vertex 16c that is a substantially right angle portion.

  As described above, the master work 30 of the present embodiment is configured such that the second shape portion as the jig shape portion is a ridge line between the end surface portion 32a on the protruding direction side of the coil end portion 32 and the peripheral surface portion 32b along the protruding direction. The vertex forming portion 52 is a shape portion that forms a vertex (see the vertex 16c) in the cross-sectional shape along the plane passing through the center line C1.

  The vertex forming unit 52 is used for adjusting the imaging position of the two-dimensional image 13 by the optical cutting scanner 7 (camera 3 thereof). That is, the position of the vertex 16c formed in the slit image 16 with respect to the vertex forming unit 52 is used as a reference, and the position of the optical cutting scanner 7 in the installed state (supporting position in the support device 20) is adjusted, so that the light The imaging position of the two-dimensional image 13 is adjusted by the camera 3 provided in a state where the cutting scanner 7 is positioned at a predetermined location.

  Specifically, as illustrated in FIG. 6, the vertex forming unit 52 is used by irradiating the slit light 11 and acquiring the two-dimensional image 13 in the same manner as the stator coil 10. That is, when the imaging position of the two-dimensional image 13 is adjusted by the vertex forming unit 52, the two-dimensional image 13 including the slit image 16 that is an image of the vertex forming unit 52 is obtained by the optical cutting method using the target object as the master work 30. To be acquired.

  Then, the adjustment of the imaging position of the two-dimensional image 13 by the vertex forming unit 52 is performed by adjusting the center of the imaging element (hereinafter, the position corresponding to the vertex 16c in the slit image 16 in the two-dimensional image 13 to acquire the two-dimensional image 13). It is performed on the basis of overlapping with the position of “sensor visual field center”). That is, in the optical cutting method in which the three-dimensional shape is grasped (measured) based on the optical cutting line 12 formed according to the cross-sectional shape by being irradiated with the slit light 11, the measurement range (inspection range) is guaranteed. From such a viewpoint, the position of the camera 3 that captures the optical cutting line 12 (the imaging position of the two-dimensional image 13) needs to be a predetermined position with respect to the inspection object.

  Therefore, as shown in FIG. 7, in the two-dimensional image 13 (two-dimensional image 13 including the slit image 16) of the vertex forming unit 52, the position of the vertex 16c of the slit image 16 overlaps the position of the sensor visual field center C2. As described above, the position of the light cutting scanner 7 is adjusted. Here, the sensor visual field center C2 corresponds to the center in the visual field range fv (rectangle shown by a broken line) of the camera 3 constituted by the imaging element such as the CCD image sensor as described above. That is, the sensor visual field center C2 corresponds to the position of the optical axis of the camera 3 (light receiving axis, see FIG. 1, straight line 3a).

  The visual field range fv of the camera 3 corresponds to the range of the two-dimensional image 13 acquired by the camera 3. Therefore, the adjustment of the imaging position of the two-dimensional image 13 by the vertex forming unit 52 is performed on the two-dimensional image 13 including the slit image 16. That is, when the master work 30 is set and the two-dimensional image 13 is captured with respect to the vertex forming unit 52, the position of the vertex 16c of the slit image 16 and the position of the sensor visual field center C2 in the two-dimensional image 13 are obtained. Relationship is grasped. Then, the position of the light cutting scanner 7 in the installed state is adjusted so that the position of the sensor visual field center C2 overlaps the position of the vertex 16c.

  In the two-dimensional image 13, the position of the vertex 16 c of the slit image 16 overlaps the position of the sensor visual field center C 2. The vertex is formed at the intersection of the optical axis of the camera 3 of the optical cutting scanner 7 and the projection surface of the slit light 11. This corresponds to the position of the corner of the portion 52 (the corner formed by the end surface 52a and the peripheral surface 52b). Therefore, the vertex forming unit 52 is arranged such that the position of the sensor visual field center C2 overlaps the position of the vertex 16c of the slit image 16 so that the position of the light cutting scanner 7 becomes a suitable position in the shape quality determination. Dimensions including the height (projection height from the end surface portion 31b of the stator core portion 31) are set.

  In this way, the vertex forming unit 52 is measured by the light cutting scanner 7, so that the position of the optical axis of the camera 3 (sensor visual field center C2) and the position of the corner of the measured vertex forming unit 52 (vertex 16c). ) Is measured. Thereby, it can be grasped how much the actual measurement range by the camera 3 of the light cutting scanner 7 is deviated from the set value.

  For example, as shown in FIG. 7, in the two-dimensional image 13 of the vertex forming unit 52, the amount of deviation between the position of the vertex 16c of the slit image 16 and the position of the sensor visual field center C2 is in the X-axis direction (lateral direction). Let ΔX be ΔZ in the Z-axis direction (vertical direction). In such a case, since the position of the vertex 16c is shifted from the position of the sensor visual field center C2, the error of the assembly position of the optical cutting scanner 7 is confirmed. Further, by measuring the values of ΔX and ΔZ, the error of the assembly position of the light cutting scanner 7 is calculated.

  Then, the optical section scanner 7 is translated by ΔX and ΔZ on a predetermined plane along the XZ plane representing the two-dimensional image 13 so that the sensor visual field center C2 coincides with the vertex 16c. The imaging position of the dimensional image 13 is adjusted. In FIG. 7, the visual field range fv1 of the camera 3 after adjusting the imaging position of the two-dimensional image 13 is indicated by a two-dot chain line.

  As described above, the apex forming portion 52 as the jig-shaped portion of the master work 30 is used, and the imaging position of the two-dimensional image 13 is adjusted by the optical cutting scanner 7. That is, by using the vertex forming unit 52, the position of the optical axis of the camera 3 is confirmed along with the adjustment of the position of the optical cutting scanner 7.

  In addition, the shape of the vertex formation part 52 is not limited to this embodiment. The shape of the vertex forming unit 52 may be any shape that forms a vertex that can easily overlap the position of the sensor visual field center C2 in the slit image 16 projected on the two-dimensional image 13.

  However, in the present embodiment, the vertex forming part 52 forms the part that becomes the vertex 16c of the slit image 16 at the ridge line parts on the inner peripheral side and the outer peripheral side of the coil end part 32, respectively. A specific shape of the vertex forming portion 52 in the present embodiment will be described with reference to FIG. In FIG. 8, reference numeral 52 indicates a cross-sectional shape of the vertex forming portion 52.

  As shown in FIG. 8, the apex forming portion 52 includes an end surface 52 a that forms a part of the end surface portion 32 a of the coil end portion 32, and a part of the peripheral surface portion 32 b on each of the inner peripheral side and the outer peripheral side of the coil end portion 32. And the peripheral surface 52b. And in the vertex formation part 52 of this embodiment, a vertex is formed in the ridgeline part of the end surface part 32a and the outer peripheral side peripheral surface part 32b by the end surface 52a and the outer peripheral side (right side in FIG. 8) peripheral surface 52b. The corner portion 52X is formed, and the end portion 52a and the inner peripheral side (left side in FIG. 8) peripheral surface 52b form an apex at the ridgeline portion between the end surface portion 32a and the inner peripheral side peripheral surface portion 32b. 52Y is formed.

  Therefore, for example, as described above, when the end surface 52a and the peripheral surface 52b form a substantially right-angled corner at the ridge line portion between the end surface portion 32a and the peripheral surface portions 32b, the end surface 52a and the peripheral surface 52b are formed. The cross-sectional shape of the apex forming portion 52 includes a side portion 52c corresponding to the end surface portion 31b of the stator core portion 31 and is substantially rectangular. Then, each of the corner 52X on the outer peripheral side and the corner 52Y on the inner peripheral side in the vertex forming part 52 forms the vertex 16c of the slit image 16 in the two-dimensional image 13 (see FIG. 7).

  The corner portion 52X on the outer peripheral side of the apex forming portion 52 captures the two-dimensional image 13 of the light cutting scanner 7a that irradiates the slit light 11 from the obliquely upward outside to the coil end portion 32 of the set master work 30. Used for position adjustment. Similarly, the corner 52Y on the inner peripheral side is used to adjust the imaging position of the two-dimensional image 13 for the optical cutting scanner 7b that irradiates the slit light 11 from the diagonally upper side with respect to the coil end portion 32.

  That is, as shown in FIG. 8, for the optical cutting scanner 7 a located on the outer peripheral side of the coil end portion 32, the sensor visual field center C <b> 2 in the visual field range fv of the camera 3 is positioned at the corner 52 </ b> X on the outer peripheral side in the slit image 16. The imaging position of the two-dimensional image 13 (position of the light cutting scanner 7) is adjusted so as to coincide with the corresponding vertex 16c. Similarly, for the optical cutting scanner 7b located on the inner peripheral side of the coil end portion 32, the sensor visual field center C2 in the visual field range fv of the camera 3 is the vertex corresponding to the inner peripheral corner 52Y in the slit image 16. The imaging position of the two-dimensional image 13 (position of the light cutting scanner 7) is adjusted so as to match 16c.

  As described above, the vertex forming part 52 has portions (corner part 52X and corner part 52Y) to be the vertex 16c of the slit image 16 on the inner peripheral side and the outer peripheral side, respectively, so that one shape part called the vertex forming part 52 is formed. Thus, it is possible to perform position error confirmation and the like for two optical cutting scanners 7 (for example, the upper optical cutting scanners 7a and 7b) located on the same side by one measurement. That is, in the configuration in which the optical cutting scanner 7 is arranged on each of the inner peripheral side and the outer peripheral side of the stator coil 10 as in this embodiment, both internal and external optical cutting is performed by one measurement for one shape portion. The imaging position of the two-dimensional image 13 with respect to the scanner 7 can be adjusted.

  As shown in FIG. 4, the master work 30 of the present embodiment has a stepped portion 53 as a jig-shaped portion. In the master work 30 of the present embodiment, the stepped portion 53 is formed in the coil end portion 32.

  The step portion 53 is a portion that forms a plurality of plane portions perpendicular to the irradiation direction of the slit light 11 from the light cutting scanner 7 (projection direction, see FIG. 1, straight line 2a). Moreover, the dimension (distance between planes, the same hereafter) between adjacent plane parts is known for these several plane parts. That is, the step portion 53 forms a step having a known dimension that is perpendicular to the irradiation direction of the slit light 11.

  As shown in FIG. 4, in this embodiment, the stepped portion 53 forms three flat portions 53 a, 53 b, and 53 c in order from the side closer to the optical cutting scanner 7 with respect to one optical cutting scanner 7. Each of the planar portions 53a, 53b, and 53c is perpendicular to the irradiation direction of the slit light 11. For this reason, the three plane portions 53a, 53b, 53c are parallel to each other.

  For example, when the irradiation direction of the slit light 11 by the light cutting scanner 7 forms an angle of 45 ° with respect to the end surface portion 31b of the stator core portion 31, the end surface portion 31b is used as a reference for each of the flat surface portions 53a, 53b, 53c. The inclination angle to be all is 45 °. Similarly, when the irradiation direction of the slit light 11 forms an angle of 30 °, the inclination angles of the flat portions 53a, 53b, and 53c are 60 °.

  For the three flat portions 53a, 53b, and 53c formed by the step portion 53, the dimensions between the flat portions 53a and 53b and the dimensions between the flat portions 53b and 53c are set to predetermined values in advance. And have known dimensions. Here, the dimension between the different plane parts (in this embodiment, the dimension between the plane parts 53a and 53b and the dimension between the plane parts 53b and 53c) may be the same value or different values.

  As described above, the master work 30 of the present embodiment uses the third shape portion as the jig shape portion as the slit light through the three plane portions 53a, 53b, and 53c perpendicular to the irradiation direction of the slit light 11. 11 as a stepped portion 53 which is a shape portion formed with a known dimension in the irradiation direction.

  The step portion 53 is used for adjusting the dimension in the two-dimensional image 13 by the optical cutting scanner 7 (camera 3 thereof). That is, the dimensions of the image portions corresponding to the plane portions 53a, 53b, and 53c measured from the slit image of the step portion 53 are compared with the known dimensions between the plane portions in the step portion 53, thereby obtaining a two-dimensional image. The dimensions are adjusted at 13.

  Specifically, as shown in FIG. 9, the stepped portion 53 is used when the two-dimensional image 13 is acquired by irradiating the slit light 11 with the light cutting scanner 7 in the installed state in the same manner as the stator coil 10. . That is, as shown in FIG. 10, when adjusting the dimension of the two-dimensional image 13 by the stepped portion 53, the two images including the slit image 18 that is an image of the stepped portion 53 are obtained by the optical cutting method using the target object as the master work 30. A dimensional image 13 is acquired.

  And the adjustment of the dimension in the two-dimensional image 13 by the step part 53 is performed in the two-dimensional image 13 between the three plane parts in the slit image 18 and between the three plane parts 53a, 53b, 53c in the step part 53. This is done by comparison with known dimensions. That is, by measuring the dimension corresponding to the plane part in the slit image 18 for the stepped part 53, the error of the dimension in the two-dimensional image 13 from the known actual dimension is grasped, and the error in the dimension. Based on the above, the dimensions of the two-dimensional image 13 are adjusted.

  As shown in FIG. 10, the slit image 18 for the step portion 53 includes linear image portions 18a, 18b, and 18c corresponding to the flat portions 53a, 53b, and 53c, respectively. In the two-dimensional image 13 including the slit image 18, the dimension (interline distance) ΔS between the image part 18a and the image part 18b and the dimension (interline distance) ΔT between the image part 18b and the image part 18c are measured. .

  Then, the dimension ΔS in the two-dimensional image 13 is compared with the dimension between the plane parts 53 a and 53 b known in the step part 53, and the dimension ΔT in the two-dimensional image 13 is compared with the plane part 53 b. Compared with the dimension between 53c. In this way, the dimensions in the two-dimensional image 13 are compared with the known dimensions for the corresponding shape portion (stepped portion 53), so that the optical cutting scanner 7 (camera 3 of the optical cutting scanner 7 is installed). It is possible to measure and confirm the dimensional error in the two-dimensional image 13 by (1). That is, it is possible to grasp how much the dimension in the two-dimensional image 13 is shifted in comparison with the actual dimension.

  As adjustment of the dimension in the two-dimensional image 13, recalibration (calibration) of the camera 3, correction of a program related to the coil end shape inspection, and the like are performed.

  As described above, the stepped portion 53 as the jig-shaped portion of the master work 30 is used, and the dimensions in the two-dimensional image 13 are adjusted. That is, by using the step portion 53, the dimensional error on the screen of the camera 3 is confirmed.

  Note that the shape of the stepped portion 53 is not limited to the present embodiment. As the shape of the stepped portion 53, a plurality of (at least two) plane portions that are perpendicular to the irradiation direction of the slit light 11 from the optical cutting scanner 7 and have known dimensions between each other are formed. Any shape can be used.

  However, in the present embodiment, the stepped portion 53 forms three flat portions 53a, 53b, and 53c as described above for the inner peripheral side and the outer peripheral side of the coil end portion 32, respectively. A specific shape of the stepped portion 53 in the present embodiment will be described with reference to FIG. In FIG. 11, reference numeral 53 indicates a cross-sectional shape of the stepped portion 53.

  As shown in FIG. 11, the stepped portion 53 faces the irradiation direction of the slit light 11 with respect to the optical cutting scanner 7 on the inner peripheral side (left side in FIG. 11) and the outer peripheral side (right side in the same figure). Three plane portions 53a, 53b, 53c are formed which are directly separated by known dimensions. In other words, the stepped portion 53 has three planar portions 53a, 53b, and 53c for the optical cutting scanner 7a that irradiates the slit light 11 from obliquely upward to the coil end portion 32 of the master work 30 in the set state. It has three plane parts 53a, 53b, and 53c for the optical cutting scanner 7b that irradiates the slit light 11 obliquely from above.

  And in this embodiment, the level | step-difference part 53 is formed as a part which has a mountain-cut shape by the three plane parts 53a, 53b, 53c (total 6 plane parts) with respect to the optical cutting scanner 7 of each of an inner peripheral side and an outer peripheral side. Is done. In other words, the stepped portion 53 is a mountain-shaped portion 53d formed by the flat portion 53a for the optical cutting scanner 7a on the outer peripheral side and the flat portion 53c for the optical cutting scanner 7b on the inner peripheral side, and is also a flat portion for the outer peripheral side. 53b and a crest-shaped portion 53e formed by the inner peripheral plane portion 53b, and a crest-shaped portion 53f formed by the outer peripheral plane portion 53c and the inner peripheral plane portion 53a in total. It has a mountain-shaped part.

  Therefore, as shown in FIG. 11, for example, with respect to the irradiation direction of the slit light 11 from the light cutting scanner 7 on both the inner and outer sides (see the straight line 2 a), the end surface portion 31 b of the stator core portion 31 in the direction of the sectional shape shown in FIG. Is 45 °, the apex angle α2 of each of the mountain-shaped portions 53d, 53e, 53f forming the step portion 53 is 90 °. Similarly, for example, when the irradiation angle α1 for the slit light 11 is 30 °, the apex angle α2 is 60 °. However, the irradiation angle α1 with respect to the slit light 11 may be different between the optical cutting scanner 7a on the outer peripheral side and the optical cutting scanner 7b on the inner peripheral side.

  As described above, the stepped portion 53 has the three flat portions 53a, 53b, and 53c on the inner peripheral side and the outer peripheral side, respectively, so that the single stepped portion of the stepped portion 53 has the same side by one measurement. It becomes possible to check the dimensional error of the two light cutting scanners 7 (for example, the upper light cutting scanners 7a and 7b). That is, in the configuration in which the optical cutting scanner 7 is arranged on each of the inner peripheral side and the outer peripheral side of the stator coil 10 as in this embodiment, both internal and external optical cutting is performed by one measurement for one shape portion. The dimensions of the two-dimensional image 13 for the scanner 7 can be adjusted.

  Moreover, as shown in FIG. 4, the master work 30 of this embodiment has the annular part 54 as a jig | tool shape part. In the master work 30 of the present embodiment, the annular portion 54 is formed in the coil end portion 32.

  The annular portion 54 is a portion in which the cross-sectional shape is constant (does not change) over the entire circumference in the coil end portion 32 that is a portion protruding in a substantially annular shape. That is, the annular portion 54 is a portion having an axial rotation shape centered on the center line C1 and having no shape change around the center line C1. Therefore, the slit image for the annular portion 54 has the same shape over the entire circumference of the coil end portion 32 (of the master work 30).

  As shown in FIG. 4, in the present embodiment, the annular portion 54 is as described above in the coil end portion 32 that is a portion protruding in a substantially annular shape with respect to the end surface portion 31 b of the stator core portion 31 serving as a reference surface. This is a layer portion on the base side (end surface portion 31b side) that does not include other jig-shaped portions. The annular portion 54 has an outer peripheral surface 54 a that forms part of the outer peripheral surface portion 32 b in the base layer side portion of the coil end portion 32. In the outer peripheral surface 54a, the peripheral surface shape centering on the center line C1 is secured over the entire circumference of the coil end portion 32 without being influenced by other jig-shaped portions.

  As described above, the master work 30 of the present embodiment has a fourth shape part as a jig-shaped part, a cross-sectional shape along the plane passing through the center line C1 is a constant shape part over the entire circumference of the master work 30. It has as a certain annular part 54.

  The annular portion 54 is used for grasping the amount of eccentricity about the rotation of the master work 30 (hereinafter referred to as “workpiece eccentric amount”). That is, the master work 30 is rotated with the direction along the center line C1 as the rotation axis direction as a movement for continuously changing the scanning position of the slit light 11 with respect to the master work 30. The amount of eccentricity with respect to the rotation of the master work 30 is the amount of work eccentricity.

  As described above, the annular portion 54 has the outer peripheral surface 54 a having a constant shape over the entire circumference (of the master work 30) of the coil end portion 32. For this reason, with respect to the image portion corresponding to the outer peripheral surface 54a in the slit image obtained by rotating the master work 30 and continuously measuring the annular portion 54 over the entire circumference, measurement points for forming the image portion are provided. It varies according to the amount of work eccentricity.

  In other words, if the workpiece eccentricity is 0, the measurement points for forming the slit image for the annular portion 54 are linear along the outer peripheral surface 54a. The measurement points forming the slit image for 54 vary. Therefore, the work eccentricity is grasped from the variation of the measurement points forming the slit image for the annular portion 54.

  Then, the work eccentricity grasped by measuring the annular portion 54 is reflected in the coil end shape inspection for the stator coil 10 performed while being rotated similarly to the master work 30. Here, the amount of work eccentricity includes the amount of eccentricity of the rotation drive mechanism for rotating the master work 30 as in the case of the stator coil 10, and the deviation between the rotation center of the rotation drive mechanism and the center line C 1 in the master work 30. The amount and the eccentric amount of the master work 30 itself are included.

  Specifically, as shown in FIG. 12, the annular portion 54 is used when the two-dimensional image 13 is acquired by irradiating the slit light 11 with the light-cutting scanner 7 in the installed state similarly to the stator coil 10. . That is, as shown in FIG. 13, when grasping the workpiece eccentricity by the annular portion 54, the two-dimensional image 13 including the slit image 19 that is an image of the annular portion 54 by the optical cutting method using the target object as the master workpiece 30. Is acquired.

  Then, the work eccentricity is grasped by the annular portion 54 based on the variation of the measurement points forming the slit image 19. That is, as the degree of eccentricity of the master work 30 increases, the degree of variation of the measurement points forming the slit image 19 also increases. Therefore, the workpiece eccentricity is grasped from the degree of variation of the measurement points forming the slit image 19 obtained by continuously measuring the annular portion 54 over the entire circumference.

  As shown in FIG. 13, a linear image portion 19 a corresponding to the outer peripheral surface 54 a is obtained as the slit image 19 by measuring the annular portion 54 over the entire circumference by one rotation of the master work 30. That is, the annular portion 54 is a portion that forms an outer peripheral surface 54 a that is a peripheral surface shape centered on the center line C <b> 1 corresponding to the rotation axis of the master work 30. Therefore, when the positional relationship between the rotating master work 30 and the optical cutting scanner 7 is constant, the slit image 19 that is a measurement result of the annular portion 54 for one turn of the master work 30 is a two-dimensional image. A linear image portion 19a appearing at a predetermined position in 13 is obtained.

  As shown in FIG. 14, in the linear image portion 19a as a measurement result for one turn of the master work 30, measurement points forming the image portion 19a exist with variation. Such variation in the measurement points appears as the thickness (width) of the line for the linear image portion 19a (see symbol D).

  The measurement point variation (hereinafter referred to as “measurement point variation D”) that forms the image portion 19 a is determined based on the measurement point on the outer peripheral surface 54 a of the annular portion 54 depending on the measurement position in the circumferential direction of the annular portion 54. Based on being measured to be at different positions. That is, due to the presence of the workpiece eccentric amount, the position of the measurement point that should exist at a predetermined position in the two-dimensional image 13 is shifted depending on the measurement position in the circumferential direction of the annular portion 54, and measurement point variation D occurs. Therefore, the workpiece eccentricity is grasped based on the measurement point variation D.

  As described above, the annular portion 54 as the jig-shaped portion of the master work 30 is used, and the work eccentric amount is grasped. That is, by using the annular portion 54, the eccentric error due to the rotation of the master work 30 is confirmed and evaluated.

  In addition, the shape of the annular part 54 is not limited to this embodiment. The shape of the annular portion 54 may be a shape that forms a portion having no shape change over the entire circumference of the master work 30 in a portion that can be measured by any one of the optical cutting scanners 7. Therefore, the portion measured as the annular portion 54 is measured by the optical cutting scanner 7a that irradiates the slit light 11 obliquely from the outside to the coil end portion 32 of the set master work 30 as in the outer peripheral surface 54a. It may be a part (for example, a part which forms a part of peripheral surface part 32b of the inner circumference side) measured by optical cutting scanner 7b which irradiates slit light 11 from inside diagonally upper part.

  Thus, when grasping | ascertaining the workpiece | work eccentric amount performed using the cyclic | annular part 54, at least any one of the attachment or detachment of the master work 30 with respect to inspection equipment, and the scanning of the slit light 11 with respect to the master work 30 (coil end part 32) is carried out. It is preferable that the measurement point variation D is measured by performing multiple times. That is, when measuring the measurement point variation D, the master work 30 is measured a plurality of times by repeatedly attaching and detaching the master work 30 to / from the inspection facility or by rotating the set master work 30 a plurality of times. Is preferred.

  When acquiring the slit image 19 for the annular portion 54 (acquisition of measurement points forming the image portion 19a), the master work 30 is supported by the support base 21 as an inspection facility and is set. The set master work 30 is rotated once and the annular portion 54 is measured over the entire circumference, whereby the slit image 19 is acquired. Therefore, when the master work 30 is attached to and detached from the inspection facility a plurality of times, measurement points are acquired by rotating the master work 30 in the set state once, and the master work 30 is set in a set state each time. Done.

  That is, the master work 30 is rotated once in the set state, and the slit image 19 for the annular portion 54 is acquired. Then, the master work 30 is once removed from the inspection facility, set again, and rotated once, and the slit image 19 for the annular portion 54 is acquired. In this manner, the master work 30 is set and removed from the inspection facility of the master work 30, that is, the attachment / detachment of the master work 30 to / from the inspection facility is performed a plurality of times with the acquisition of measurement points. And the measurement point dispersion | variation D is measured from the measurement point (image part 19a) for multiple rotation acquired whenever the master workpiece 30 is attached or detached with respect to the inspection equipment.

  When the master work 30 in the set state is rotated a plurality of times, the master work 30 is rotated once as described above, and the slit image 19 for the annular portion 54 is acquired for a plurality of rotations. That is, when the master work 30 in the set state is rotated a plurality of times, the scanning of the slit light 11 with respect to the master work 30 (the coil end portion 32) is performed a plurality of times. Then, the measurement point variation D (see FIG. 14) is measured from the measurement points (image portion 19a) for a plurality of rotations acquired every rotation of the master work 30.

  As described above, when the master work 30 is set and at least one of the scanning of the slit light 11 with respect to the master work 30 is performed a plurality of times with the acquisition of the measurement points forming the image portion 19a. The measurement point variation D is measured. As a result, in addition to the amount of eccentricity of the master workpiece 30 itself, the workpiece eccentricity, the variation of measuring instruments such as the optical cutting scanner 7 that affect the determination result of the inside / outside determination, and the positioning reproducibility of the workpiece with respect to the inspection equipment (workpiece) It is possible to comprehensively grasp and evaluate errors by inspection equipment, including the repetitive error of the set position).

  As described above, the work eccentricity grasped by using the annular portion 54 is reflected in the creation of reference data used for the shape pass / fail determination in the coil end shape inspection. As described above, in determining the quality of the shape, the limit shape portion 55 of the master work 30 is used, and the measurement points in the two-dimensional image 13 capturing the light cutting line 12 formed on the surface of the limit shape portion 55 are used. Based on the reference measurement point group 15a which is a set, reference data serving as a determination reference in the shape pass / fail determination is created (see FIG. 3). Then, when the reference data used for the shape quality determination is created, the reference measurement point group 15a is reduced based on the measurement point variation D representing the work eccentricity.

  That is, in the coil end shape inspection of the present embodiment, the reference measurement point group 15a that captures the light section line 12 formed on the surface of the limit shape portion 55 obtained by the light section method using the target object as the master work 30. Are moved in the direction of reducing the coil end allowable shape on the basis of the measurement point variation D, and are created as reference data serving as a determination reference in the shape pass / fail determination. Here, the coil end allowable shape is the maximum outer shape allowed as a non-defective product with respect to the outer shape of the coil end 10b of the stator coil 10.

  And the actual measurement point which is a measurement point in the two-dimensional image 13 which caught the optical cutting line 12 formed in the surface of the part of the coil end 10b acquired by the optical cutting method which uses the target object as the stator coil 10 is measured. By comparing with reference data reflecting the point variation D, the shape quality determination is performed. That is, the reference data reflecting the measurement point variation D is used in the inside / outside determination performed in the coil end shape inspection.

  Specifically, as shown in FIG. 15, a reference measurement point group 15 a (slit image 15, the same applies hereinafter) acquired by measuring the limit shape portion 55 of the master work 30 is displayed in the two-dimensional image 13. By being moved, it is reduced to a point group 15b indicated by a broken line (hereinafter referred to as “reduced point group 15b”). That is, the reduction point group 15b is obtained by moving the reference measurement point group 15a so as to reduce the coil end allowable shape based on the measurement point variation D.

  Here, with regard to the movement of the reference measurement point group 15a on the two-dimensional image 13, the direction in which the coil end allowable shape is reduced corresponds to the inner direction with respect to the outside of the reference measurement point group 15a. Note that the outside of the reference measurement point group 15a is the same as the “outside” of the reference data as described above. That is, “outside” with respect to the reference measurement point group 15 a means the outside with respect to the region corresponding to the limit shape portion 55 in the two-dimensional image 13.

  Accordingly, the inner direction of the movement of the reference measurement point group 15a is a direction toward the region corresponding to the limit shape portion 55 in the two-dimensional image 13. Therefore, the reduced point group 15b in which the reference measurement point group 15a is moved in the direction of reducing the coil end allowable shape is, for example, the outer shape of the limit shape portion 55 drawn by the reference measurement point group 15a in the two-dimensional image 13. On the other hand, it becomes an aspect which draws the shape reduced similarly in the inside of the standard measurement point group 15a. In other words, the reduction point group 15b is obtained by offsetting the reference measurement point group 15a in the inner direction (the direction in which the coil end allowable shape is reduced).

  Then, the movement from the reference measurement point group 15a to the reduction point group 15b in the two-dimensional image 13 is performed based on the measurement point variation D representing the work eccentricity grasped by using the annular portion 54 as described above. . That is, based on the measurement point variation D, the amount of movement from the reference measurement point group 15a to the reduced point group 15b is derived.

  The movement from the reference measurement point group 15a to the reduction point group 15b based on the measurement point variation D (offset of the reference measurement point group 15a) is moved by, for example, the measurement value of the measurement point variation D. In this case, as described above, for example, when the inside / outside determination is performed using the Z coordinate on the XZ plane representing the two-dimensional image 13, the reference measurement point group 15a has the measurement value of the measurement point variation D in the Z direction. Is moved inward (downward in FIG. 15) by a distance corresponding to (see symbol E).

  The offset of the reference measurement point group 15a is not limited to the case where the measurement value of the measurement point variation D is used as it is as the movement distance of the reference measurement point group 15a. The offset of the reference measurement point group 15a is, for example, a predetermined value derived from the measurement value of the measurement point variation D to the coordinate value (for example, the value of the Z coordinate) in the two-dimensional image 13 for each measurement point of the reference measurement point group 15a. It may be performed by multiplying a coefficient.

  In this way, the reduced point group 15b in which the reference measurement point group 15a is moved based on the measurement point variation D is created as reference data in the inside / outside determination. That is, the reduced point group 15 b forms a boundary that defines an allowable range for the outer shape of the coil end 10 b portion of the stator coil 10 in the two-dimensional image 13. Accordingly, in FIG. 15, the reference point group 15 a (solid line) representing the shape of the limit shape portion 55, the reduced point group 15 b indicated by a broken line represents the coil end allowable shape.

  The point group created as the reference data used for the inside / outside determination is moved (reduced) from the reference measurement point group 15a to the reduced point group 15b based on the measurement point variation D. This corresponds to reduction based on the amount of eccentricity. The reduction of the coil end allowable shape corresponds to a stricter criterion for determining the shape quality.

  In this way, when the reference data used for the inside / outside determination is created, the reference measurement point group 15a is offset based on the measurement point variation D, so that the coil end allowable shape considering the determination error due to the mechanical factor of the inspection facility is taken into account. Can be defined. That is, when creating the reference data, the workpiece eccentricity amount in the inspection facility is reflected as the measurement point variation D, and therefore the allowable coil end shape defined by the reference data has a size incorporating the workpiece eccentricity amount. Thereby, even if there is a workpiece eccentric amount in the inspection facility, the inspection accuracy in the coil end shape inspection can be ensured.

  As described above, the master work 30 according to the present embodiment includes, as the jig-shaped portion, the slit portion 51 that is the first shape portion, the vertex forming portion 52 that is the second shape portion, and the third shape portion. And a ring-shaped portion 54 which is a fourth shape portion. Further, the master work 30 of the present embodiment includes a limit shape portion 55 that is a fifth shape portion as a shape portion used for creation of the coil end allowable shape (creation of reference data). In addition, in the master work 30 of this embodiment, although each of these shape parts is formed in the coil end part 32, it is not limited to this. That is, each shape part of the master work 30 may be partially or entirely formed on the stator core portion 31 of the master work 30.

  An example of a flow for creating a coil end allowable shape including accuracy confirmation in an inspection facility, which is performed using the master work 30 of the present embodiment, will be described with reference to a flowchart shown in FIG.

  As shown in FIG. 16, in this example, first, the irradiation position of the slit light 11 by the slit portion 51 of the master work 30 is adjusted (S110). That is, the slit portion 51 is used, and the posture of the light cutting scanner 7 is confirmed. After the irradiation position of the slit light 11 is adjusted, the entire circumference of the master work 30 is measured (S120). That is, when the master work 30 is set to the inspection facility and rotated, measurement by the optical cutting method is started, and image data (slit image, hereinafter) about each jig shape portion of the master work 30 is included. The same).

  Next, the imaging position of the two-dimensional image 13 is adjusted by the vertex forming unit 52 (S130). That is, based on the image data for the vertex forming unit 52, the error of the assembly position of the optical cutting scanner 7 is confirmed and calculated, and the position of the optical cutting scanner 7 is adjusted. Next, the dimension of the two-dimensional image 13 is adjusted by the step portion 53 (S140). That is, the dimensional error on the screen of the camera 3 is confirmed based on the image data for the step portion 53.

  Next, the workpiece eccentric amount is grasped by the annular portion 54 (S150). That is, the work eccentricity is confirmed based on the image data for the annular portion 54, and the measurement point variation D is measured. Next, data acquisition by the limit shape part 55 is performed (S160). That is, the reference measurement point group 15 a for each part constituting the limit shape part 55 is acquired as image data for the limit shape part 55. In step S160, the coil end allowable shape before being reduced is created from the image data of the limit shape portion 55.

  Then, after the data for the limit shape portion 55 is acquired, the data is reduced based on the work eccentricity (S170). That is, the reference measurement point group 15a is offset as the reduction point group 15b based on the measurement point variation D representing the workpiece eccentricity grasped by the annular portion 54, and the coil end allowable shape is reduced. By the steps S160 and S170, the coil end allowable shape used for the inside / outside determination, that is, the reference data is created. The order of steps S110 to S150 is not particularly limited. However, steps S130 to S150 are performed after step S120.

  As described above, by using the master work 30 of the present embodiment, the coil end in consideration of the measurement error due to the dimensional error of the measurement and the mechanical factor of the inspection facility, and the determination error due to the mechanical factor of the inspection facility. The allowable shape can be created at a time with a measuring instrument such as the light cutting scanner 7 attached to the inspection facility.

  According to the shape inspection method and the master work 30 of the present embodiment described above, in the shape inspection by the optical cutting method, it is not necessary to remove the measuring instrument from the inspection facility, and the error about the inspection facility that affects the inspection accuracy. Can be confirmed and evaluated.

  That is, according to the slit part 51 and the vertex forming part 52 of the master work 30, the irradiation position of the slit light 11 and the imaging position of the two-dimensional image 13 are adjusted while the optical cutting scanner 7 is installed. . That is, the installation angle of the installed optical cutting scanner 7 is guaranteed by the slit portion 51, and the assembly position of the installed optical cutting scanner 7 is confirmed by the apex forming unit 52. Thereby, the measurement range by the light cutting scanner 7 can be guaranteed.

  In addition, according to the stepped portion 53 of the master work 30, the stepped portion 53 is measured by the light cutting scanner 7 in the installed state, thereby confirming a dimensional error for the light cutting scanner 7 in the installed state. Thereby, when confirming the dimensional error of the optical cutting scanner 7, it is not necessary to remove and assemble the optical cutting scanner 7 from the inspection equipment for each confirmation.

  Further, according to the annular portion 54 included in the master work 30, the workpiece eccentricity in the inspection facility is grasped by measuring the annular portion 54 by the light cutting scanner 7 in the installed state. In this way, based on the workpiece eccentricity obtained by measuring the annular portion 54, the coil end allowable shape created by measuring the limit shape portion 55 is reduced. Thereby, since the measurement error due to the mechanical factor of the inspection facility can be taken into consideration in the shape quality determination, the reliability of the inspection by the inspection facility can be improved.

  Then, all the shape parts of the slit part 51, the vertex forming part 52, the step part 53, the annular part 54, and the limit shape part 55 are integrated into one master work 30, thereby confirming the accuracy of the optical cutting scanner 7. In addition, the calibration work can be simplified and the number of man-hours can be reduced.

  An embodiment of the shape inspection jig according to the present invention will be described with reference to FIG. In the description of the present embodiment, the same reference numerals are given to the portions corresponding to the above-described embodiment, and the description thereof is omitted as appropriate. Further, in FIG. 17, only one side (upper side) coil end portion 32 is illustrated among the coil end portions 32 respectively formed on the upper and lower sides of the stator core portion 31 in the master work 30 as the shape inspection jig. . However, the upper and lower coil end portions 32 have the same shape with respect to the stator core portion 31 (for example, a shape that is symmetrical up and down via the stator core portion 31).

  As shown in FIG. 17, the master work 30 according to the present embodiment is made of aluminum and is subjected to a surface treatment suitable for obtaining the two-dimensional image 13, such as an alumite treatment. Further, the master work 30 according to the present embodiment has three (two in the drawing) bolt boss portions 31 c in the stator core portion 31. The three bolt boss portions 31 c are formed on the outer peripheral surface portion 31 a of the stator core portion 31 at substantially equal intervals in the circumferential direction.

  In addition, the master work 30 according to the present embodiment has four slit portions 51 in the coil end portion 32. The four slit portions 51 are formed in the coil end portion 32 at substantially equal intervals in the circumferential direction.

  Further, the master work 30 according to the present embodiment has an annular portion 54 in the stator core portion 31. That is, in the master work 30 according to the present embodiment, the inner side surface of the stator core portion 31 having an annular outer shape forms a cylindrical inner peripheral surface. The entire peripheral portion of the inner side surface of the stator core portion 31 is used as the annular portion 54. In addition, the master work 30 according to the present embodiment has one apex forming portion 52 and one step portion 53 that are jig-shaped portions.

  In addition, the master work 30 according to the present embodiment includes, as the limit shape portion 55, a first shape portion 55a, a second shape portion 55b, and a third shape portion 55c, which are three kinds of shape portions having different heights, and a coil end. The parts 32 are separated in the circumferential direction (with a predetermined interval).

  In the master work 30 according to the present embodiment having each shape portion as described above, as shown in FIG. 17, from the first shape portion 55 a of the limit shape portion 55 in the clockwise direction in the circumferential direction of the coil end portion 32. Along with the apex forming portion 52, the second shape portion 55b of the limit shape portion 55, one slit portion 51, the step portion 53, the third shape portion 55c of the limit shape portion 55, and the other three slit portions 51 Are formed at a predetermined interval. An annular portion 54 is formed on the inner side surface of the stator core portion 31.

  The master work 30 according to this example as described above is used, and the shape inspection method according to the above-described embodiment is actually performed, so that a measuring instrument such as the optical cutting scanner 7 is attached to the inspection facility. This makes it possible to check and evaluate errors in inspection equipment that affect inspection accuracy.

DESCRIPTION OF SYMBOLS 1 Shape inspection apparatus 2 Laser projector 3 Camera 7 Optical cutting scanner 10 Stator coil 10a Stator core 10b Coil end 11 Slit light 12 Optical cutting line 13 Two-dimensional image (captured image)
15 Slit image 15a Reference measurement point group 15b Reduction point group 16 Slit image 16c Vertex 18 Slit image 19 Slit image 30 Master work (shape inspection jig)
31 Stator core portion 31b End surface portion (reference surface)
32 Coil end portion 32a End surface portion 32b Peripheral surface portion 51 Slit portion (first shape portion)
51a Slit 52 Vertex formation part (second shape part)
53 Stepped part (third shape part)
53a, 53b, 53c Plane part 54 Ring part (fourth shape part)
55 Limit shape part (fifth shape part)

Claims (14)

A stator coil having a stator core and a coil end formed by a coil wound around the stator core is used as an inspection object, and an optical cutting method is used to obtain a captured image of reflected light obtained by irradiating the target object with slit light. A stator coil shape inspection method for determining pass / fail of the shape of the coil end portion based on the captured image acquired for each portion of the stator coil by continuously changing the scanning position of the slit light with respect to the stator coil. Because
Surface inspection suitable for acquisition of the captured image is performed, and for shape inspection having a coil end portion formed as a portion projecting in a substantially annular shape with respect to a predetermined reference surface following the shape of the coil end with respect to the stator core Using a jig,
The shape inspection jig is
A first shape portion that is a shape portion that forms a slit along a plane passing through a center line determined for the coil end portion;
A second shape portion which is a shape portion forming a vertex in a cross-sectional shape along a plane passing through the center line at a ridge line portion between an end surface portion on the protruding direction side of the coil end portion and a circumferential surface portion along the protruding direction; Having
With the shape inspection jig set in the same manner as the stator coil where the shape of the coil end is inspected,
Using the first shape portion, on the basis that the slit light overlaps the slit, adjust the irradiation position of the slit light,
Using the second shape portion, the position corresponding to the vertex in the image of the second shape portion in the captured image obtained by the optical cutting method using the target object as the shape inspection jig is the A stator coil shape inspection method, comprising: adjusting an imaging position of the captured image on the basis of overlapping with a center position of an image sensor for acquiring a captured image. The second shape portion is
Forming the apex part at the ridge line part on each of the inner peripheral side and the outer peripheral side of the coil end part;
The stator coil shape inspection method according to claim 1. The shape inspection jig is
A third shape portion that is a shape portion that forms a plurality of plane portions perpendicular to the irradiation direction of the slit light with a known dimension in the irradiation direction of the slit light;
Dimension between the plurality of plane portions in the image of the third shape portion in the captured image obtained by the optical cutting method using the third shape portion and using the target object as the shape inspection jig. 3. The stator coil shape inspection method according to claim 1, wherein the dimension in the captured image is adjusted by comparing with the known dimension between the plurality of planar portions. The third shape portion is
Forming the plurality of planar portions for each of an inner peripheral side and an outer peripheral side of the coil end portion;
The stator coil shape inspection method according to claim 3. The shape inspection jig is
The cross-sectional shape along the plane passing through the center line further has a fourth shape portion that is a constant shape portion over the entire circumference of the shape inspection jig,
Based on variation of measurement points for forming an image of the fourth shape portion in the captured image obtained by the optical cutting method using the fourth shape portion and using the target object as the shape inspection jig. The amount of eccentricity about rotation with the direction along the center line being the movement of the shape inspection jig for continuously changing the scanning position of the slit light with respect to the shape inspection jig The shape inspection method for a stator coil according to any one of claims 1 to 4, wherein the shape is inspected. The shape inspection jig is set in the same manner as the stator coil in which the shape of the coil end portion is inspected, and at least one of scanning of the slit light with respect to the shape inspection jig is performed. , Measuring the variation of the measurement point by performing the measurement point multiple times with the acquisition of the measurement point,
The stator coil shape inspection method according to claim 5. The shape inspection jig is
It further has a fifth shape portion that is a shape portion that forms the maximum outer shape allowed as a non-defective product with respect to the outer shape of the coil end portion,
A reference measurement point group that is a set of measurement points in the captured image that captures a light cutting line formed on the surface of the fifth shape portion acquired by the light cutting method using the target object as the shape inspection jig. Is created as reference data serving as a determination criterion in the pass / fail determination, in which the maximum outer shape is moved based on the variation in the measurement points.
An actual measurement point that is a measurement point in the captured image obtained by capturing a light cutting line formed on the surface of the coil end portion obtained by the light cutting method using the target object as the stator coil is compared with the reference data. To perform the pass / fail judgment.
The stator coil shape inspection method according to claim 5, wherein the stator coil shape is inspected. A stator coil having a stator core and a coil end formed by a coil wound around the stator core is used as an inspection object, and an optical cutting method is used to obtain a captured image of reflected light obtained by irradiating the target object with slit light. A stator coil shape inspection method for determining pass / fail of the shape of the coil end portion based on the captured image acquired for each portion of the stator coil by continuously changing the scanning position of the slit light with respect to the stator coil. A jig for shape inspection used in
A surface treatment suitable for acquisition of the captured image is performed, and has a coil end portion formed as a portion that protrudes in a substantially annular shape with respect to a predetermined reference surface following the shape of the coil end with respect to the stator core,
A first shape portion that is a shape portion that forms a slit along a plane passing through a center line determined for the coil end portion;
A second shape portion which is a shape portion forming a vertex in a cross-sectional shape along a plane passing through the center line at a ridge line portion between an end surface portion on the protruding direction side of the coil end portion and a circumferential surface portion along the protruding direction; Have
In the state set in the same manner as the stator coil where the shape of the coil end is inspected,
Adjustment of the irradiation position of the slit light is performed on the basis that the first shape portion is used and the slit light overlaps the slit,
The position corresponding to the vertex in the image of the second shape portion in the captured image obtained by using the second shape portion and being the target object of the light cutting method is the captured image. A shape inspection jig, wherein the image pickup position of the picked-up image is adjusted with reference to the position of the center of the image pickup device for acquisition. The second shape portion is
Forming the apex part at the ridge line part on each of the inner peripheral side and the outer peripheral side of the coil end part;
The shape inspection jig according to claim 8. The shape inspection jig is
A third shape portion that is a shape portion that forms a plurality of plane portions perpendicular to the irradiation direction of the slit light with a known dimension in the irradiation direction of the slit light;
The third shape part is used, and the dimension between the plurality of plane parts in the image of the third shape part in the captured image acquired by being the target object of the light cutting method, 10. The shape inspection jig according to claim 8, wherein the dimension of the captured image is adjusted by comparison with the known dimension between a plurality of plane portions. The third shape portion is
Forming the plurality of planar portions for each of an inner peripheral side and an outer peripheral side of the coil end portion;
The shape inspection jig according to claim 10. The shape inspection jig is
The cross-sectional shape along the plane passing through the center line further has a fourth shape portion that is a constant shape portion over the entire circumference of the shape inspection jig,
Based on the variation of the measurement points that form the image of the fourth shape portion in the captured image obtained by using the fourth shape portion and being the target object of the light cutting method, The amount of eccentricity with respect to rotation with the direction along the center line, which is the movement of the shape inspection jig for continuously changing the scanning position of the slit light with respect to the shape inspection jig, as the rotation axis direction is grasped. The jig for shape inspection according to any one of claims 8 to 11, wherein the jig is used for shape inspection. The shape inspection jig is set in the same state as the stator coil where the shape of the coil end portion is inspected, and at least one of scanning of the slit light with respect to the shape inspection jig is performed. , The measurement point variation is measured by performing multiple times with the acquisition of the measurement point,
The shape inspection jig according to claim 12, wherein: The shape inspection jig is
It further has a fifth shape portion that is a shape portion that forms the maximum outer shape allowed as a non-defective product with respect to the outer shape of the coil end portion,
A reference measurement point group that is a set of measurement points in the captured image that captures a light cutting line formed on the surface of the fifth shape portion acquired by being the target object of the light cutting method is the measurement. What has been moved in the direction of reducing the maximum outer shape based on the variation of points is created as reference data to be a determination criterion in the quality determination,
An actual measurement point that is a measurement point in the captured image that captures a light cutting line formed on the surface of the coil end portion obtained by the light cutting method using the target object as the stator coil is the reference data. By the comparison, the quality determination is performed.
The jig for shape inspection according to claim 12 or 13, wherein the jig is used for shape inspection.

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