JP2016140943A - Gear chuck device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear chuck device capable of processing the gear of a highly accurate and wide form by a simple device configuration.SOLUTION: A gear chuck device 100 includes a pressing body 105 for pressing respective tooth surfaces 91a and 91b constituting at least three tooth spaces 91 in a processed gear 90. The pressing body 105 has a pressing surface 105a formed at one end of a round rod body and a receiving surface 105b formed at the other end. The pressing surface 105a includes two flat surfaces extending flat oppositely to the tooth surfaces 91a and 91b. The pressing bodies 105 are respectively held by three holding parts 104 supported by three distortable and deformable deforming parts 103. Each of the three holding parts 104 is stored in a holder guide 110 in the slidable contact of a holder side sliding surface 104 which is an outer peripheral part with a guide side sliding surface 110a including a slope.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gear chuck device that concentrically holds a gear to be processed, which is a workpiece, on a rotation center axis of a main shaft of a machine tool.

  Conventionally, in various machine tools such as a lathe, a milling machine, or a machining center in which a center hole is machined in the center of a gear after forming gear teeth, the work gear that is a work piece with respect to the rotation center axis of the machine tool is used. A gear chuck device is used to align the rotation center axes.

  For example, the following Patent Document 1 discloses a gear chuck including a steel ball that is fitted into each of six tooth grooves in a gear to be processed, and a work fixing device that fixes the gear to be processed by pressing a side surface of the gear to be processed. An apparatus is disclosed.

Japanese Patent Laid-Open No. 08-99205

  However, the gear chuck device described in Patent Document 1 includes a steel ball for centering the workpiece gear and a workpiece fixing device for fixing the workpiece gear, so that the configuration of the device is complicated. And there was a problem of upsizing. Further, in the gear chuck device described in Patent Document 1, the finger claws constituting the workpiece fixing device project in front of the gear to be processed, that is, on the side where the blade for processing the center hole of the gear to be processed is disposed. Since the blade is supported by a long arm to avoid physical interference with the fingernail, the processing accuracy of the center hole is lowered and the types of gears that can be processed are limited. There was a problem.

  The present invention has been made to address the above problems, and an object of the present invention is to provide a gear chuck device capable of processing a wide range of gears with high accuracy and a simple device configuration.

  In order to achieve the above object, a feature of the present invention is a gear chuck device that holds a work gear that is a work piece concentrically on a rotation center axis of a main shaft of a machine tool, and is a gear chuck device that includes at least three of the work gears. A pressing body that is inserted into each tooth groove and pressed against two tooth surfaces that constitute each tooth groove, and a holding portion that holds the at least three pressing bodies on the radially outer side of the gear to be machined, A pressing member pressing means for pressing the at least three pressing bodies against the workpiece gear by displacing the holding portion toward the rotation center axis side of the workpiece gear to hold the workpiece gear; The pressing surfaces pressed against the two tooth surfaces are configured as a flat surface extending flat or a curved surface extending along the two tooth surfaces.

  According to the feature of the present invention configured as described above, the gear chuck device includes a pressing body that is pressed into at least three tooth grooves in the workpiece gear, and a pressing body pressing that presses each of the pressing bodies into each tooth groove. Means for centering and fixing the gear to be processed on the basis of the tooth surface, so that the gear to be processed can be held with high accuracy with a simple device configuration, and the side of the gear to be processed is By being opened, it is possible to process a wide variety of gears. In the gear chuck device, since the pressing surface of the pressing body pressed against the tooth surface of the gear to be processed is formed of a flat surface or a curved surface along the tooth surface, the tooth surface of the gear to be processed generates a press mark or a scratch. Can be held without.

  According to another aspect of the present invention, in the gear chuck device, the holding unit includes a pressing body position adjusting mechanism that adjusts the position of the at least three pressing bodies toward the rotation center axis of the gear to be processed. There is to be.

  According to another feature of the present invention configured as described above, the gear chuck device includes a pressing body position adjusting mechanism that holds each pressing body so that the position of the workpiece gear with respect to the rotation center axis side can be adjusted. The rotation center axis of the gear to be machined can be exactly matched to the rotation center axis of the machine tool. Thereby, the gear chuck device can improve the processing accuracy of the gear to be processed by the machine tool.

  According to another aspect of the present invention, in the gear chuck device, the pressing body is formed in a round bar shape, and the holding portion has a holding hole that holds the pressing body in a state in which the pressing body can rotate and slide in the circumferential direction. Is to have.

  According to another feature of the present invention configured as described above, the gear chuck device has a holding body in which the pressing body is formed in a round bar shape and the holding portion holds the pressing body in a state in which the pressing body can rotate and slide in the circumferential direction. Since it has a hole, these operations can be facilitated by rotating and sliding the pressing body when the gear to be processed is attached and detached. In particular, this is effective in a gear in which a gear to be processed is formed by twisting a tooth groove such as a helical gear.

  Another feature of the present invention is that in the gear chuck device, the pressing body pressing means has flexibility to displace the holding portion in a radial direction of the gear to be processed, and has a holding portion and a spindle of the machine tool. A guide side composed of a deformed portion formed between a draw bar that advances and retreats along the axial direction and an inclined surface that contacts the outer surface of the holding portion and extends along one of the advancing and retreating directions of the draw bar And having a sliding surface.

  According to another aspect of the present invention configured as described above, the gear chuck device includes a deforming portion in which the pressing body pressing unit is connected to the draw bar and a guide side configured by an inclined surface extending along one of the forward and backward directions of the draw bar. Therefore, when the draw bar advances or retreats, the holding portion is displaced toward the gear to be processed through the bending deformation of the deformation portion. Thereby, the gear chuck device can simultaneously approach or separate the three pressing bodies respectively held by the three holding portions from the gear to be processed.

It is side surface sectional drawing which shows the outline of a structure of the gear chuck apparatus based on this invention. It is a front view which shows the outline of a structure of the pressing body holder and workpiece | work receiving body in the gear chuck apparatus shown in FIG. 1 in the state holding the to-be-processed gear. FIG. 3 is an enlarged front view partially showing a state in which the pressing body shown in FIG. 2 presses the tooth surface in the tooth groove of the gear to be processed. (A), (B) has shown the outline of the structure of the pressing body in the gear chuck apparatus shown in FIG. 1, (A) is a side view of a pressing body, (B) is a front view of a pressing body. is there. (A), (B) has shown the outline of the structure of the adjustment bolt in the gear chuck apparatus shown in FIG. 1, (A) is a side view of an adjustment bolt, (B) is a front view of an adjustment bolt. is there. It is side surface sectional drawing which shows the outline of a structure of the gear chuck apparatus which concerns on the modification of this invention. It is a front view which shows the outline of a structure of the gear chuck apparatus shown in FIG. It is an enlarged front view which shows the state which the pressing body which concerns on the other modification of this invention is pressing the tooth surface within the tooth space of a to-be-processed gear.

  Hereinafter, an embodiment of a gear chuck device according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional side view schematically showing the configuration of a gear chuck device 100 according to the present invention. The gear chuck device 100 is a mechanical device that is attached to a main shaft that is rotationally driven in a machine tool such as a lathe, a milling machine, or a machining center, and detachably holds a workpiece gear 90 that is a workpiece. In FIG. 1, the work gear 90 is indicated by a two-dot chain line.

(Configuration of Gear Chuck Device 100)
The gear chuck device 100 includes a pressing body holder 101. The pressing body holder 101 is a part that holds the pressing body 105 so as to be pressed against the tooth groove 91 of the gear 90 to be processed, and is configured by forming a metal material into a cylindrical shape. More specifically, the pressing body holder 101 mainly includes a base portion 102, a deformation portion 103, and a holding portion 104.

  The base portion 102 is formed in a cylindrical shape, and an internal thread is formed on its inner peripheral surface to which a holder nut 113 described later is screwed. The deformable portion 103 is a portion that extends in the axial direction from each of three circumferentially spaced positions on one end surface (the right side in the drawing) of both end surfaces of the base portion 102, and projects from the outer peripheral surface of the base portion 102. Are formed in a plate shape curved in a curved shape. These three deformable portions 103 are formed to have elasticity to bend and deform inward and outward with respect to the central axis of the pressing body holder 101.

  As shown in FIG. 2, the holding portion 104 is a portion that detachably holds the pressing body 105, and projects from one end of the three deformable portions 103 to the radially outer side and the inner side of the pressing body holder 101, respectively. Is formed. In this case, on each outer peripheral surface of the three holding portions 104, a holder-side sliding surface 104a that is tapered outward in the radial direction so as to slide on a holder guide 110 described later is formed. Further, the inner peripheral surfaces 104b of the three holding portions 104 are formed as circular arc surfaces having an inner diameter slightly larger than the outer diameter of the gear 90 to be processed.

  On the other hand, inside these three holding portions 104, holding holes 104c are formed in a state of penetrating from the inner peripheral surface 104b to the holder-side sliding surface 104a, and a pressing body 105 is formed in each of these holding holes 104c. Are provided. An adjustment bolt 106 is provided inside the holding portion 104 in a direction orthogonal to the three pressing bodies 105.

  As shown in FIGS. 3 and 4A and 4B, the pressing body 105 is a pin-shaped component that is pressed against the two tooth surfaces 91a and 91b constituting the tooth groove 91 of the gear 90 to be machined. The pressing surface 105a is formed at one end of the round bar, and the receiving surface 105b is formed at the other end. The pressing body 105 is formed of a material (tool steel or the like) having higher wear resistance than the tooth surfaces 91a and 91b of the gear 90 to be processed or a surface treatment (surface quenching, nitriding treatment, carburizing treatment, or the like).

  The pressing surface 105a is a portion that is pressed against the two tooth surfaces 91a and 91b of the gear 90 to be processed, and is constituted by two flat surfaces that extend flatly facing the tooth surfaces 91a and 91b. In this case, the two planes constituting the pressing surface 105a are formed at angles that contact the tooth surfaces 91a and 91b when the pressing surface 105a is inserted into the tooth gap 91, and the apex at which the two planes intersect each other. That is, one tip portion of the pressing body 105 is formed of a curved surface. Therefore, the two planes constituting the pressing surface 105a are formed at an angle corresponding to the tooth groove shape of the gear 90 to be processed. The pressing surface 105a can be used in common for a wide range of gears by setting the angle between the two planes to 30 ° or more and 50 ° or less, preferably 40 °.

  The receiving surface 105b is a portion that is pressed by the adjusting bolt 106, and is formed in a conical shape that tapers outward. The pressing body 105 is fitted inside the holding portion 104 so as to be slidable in the central axis direction (radial direction) of the pressing body holder 101 and in the circumferential direction of the pressing body 105. In this case, the holding unit 104 is provided with a set screw 105 c for fixing the position and the circumferential direction of the pressing body 105 in a direction orthogonal to the pressing body 105.

  As shown in FIGS. 5A and 5B, the adjustment bolt 106 is a shaft-like component for defining the amount of protrusion of the pressing body 105 from the inner peripheral surface of the holding portion 104. It is comprised by the part 106a, the 1st guide part 106b, the pushing part 106c, and the 2nd guide part 106d. The screw portion 106a is a portion where the adjustment bolt 106 is screwed in the holding portion 104, and is constituted by a male screw. The first guide part 106b is a part for guiding and maintaining the adjustment bolt 106 in the direction perpendicular to the pressing body 105 in the holding part 104 in cooperation with the second guide part 106d, and is formed in a columnar shape. ing.

  The pressing portion 106c is a portion that presses the receiving surface 105b of the pressing body 105 and displaces the pressing body 105 toward the gear 90 to be processed, and is formed to expand in a tapered shape toward the second guide portion 106d. The second guide portion 106d is a portion for guiding and maintaining the adjustment bolt 106 in the direction perpendicular to the pressing body 105 in the holding portion 104 in cooperation with the first guide portion 106b, and is formed in a columnar shape. Has been. A concave hexagon hole for rotating the adjustment bolt 106 within the holding portion 104 is formed on the end surface of the second guide portion 106d.

  The adjusting bolt 106 has a screw portion 106 a screwed in a direction perpendicular to the pressing body 105 inside the holding portion 104 with the end face of the second guide portion 106 d exposed at the end face of the holding portion 104. . In this case, the holding portion 104 is provided with a set screw 106 e for fixing the position and rotation direction of the adjustment bolt 106 in a direction perpendicular to the adjustment bolt 106.

  The holder guide 110 is a component for displacing the three holding portions 104 inward while holding the pressing body holder 101 so as to be slidable in the axial direction of the pressing body holder 101. The holder guide 110 is formed of a metal material in a cylindrical shape. It is configured. A guide-side sliding surface 110 a is formed on the inner peripheral portion of one end (right side in the drawing) of the holder guide 110. The guide-side sliding surface 110a is a portion for the three holder-side sliding surfaces 104a in the pressing body holder 101 to slide to displace the holding portion 104 inward, and is tapered toward the outside in the axial direction. It is spread and formed. The holder guide 110 is formed such that one end (right side in the drawing) of the holder guide 110 projects in a flange shape, and the projecting portion is fixed to the end surface of the outer cylinder 111 with a bolt.

  The outer cylinder 111 is a component that holds the holder guide 110 in a accommodated state, and is configured by forming a metal material into a cylindrical shape. An outer cylinder base 112 is attached to the outer cylinder 111 by bolts on the end surface opposite to the side on which the holder guide 110 is attached. The outer cylinder base 112 is a part for attaching the gear chuck device 100 to a main shaft of a machine tool (not shown), and is configured by forming a metal material into a cylindrical shape. The outer cylinder base 112 is formed with a cylindrical connecting portion 112a that is fitted to the spindle of the machine tool on the side opposite to the side on which the outer cylinder 111 is attached, and a draw bar DB extending from the spindle of the machine tool passes therethrough. A through-hole 112b is formed. In FIG. 1, the draw bar DB is indicated by a two-dot chain line.

  The holder nut 113 is a component for advancing and retracting the pressing body holder 101 in the direction of the central axis of the pressing body holder 101, and a wing projecting radially outward from three positions in the circumferential direction of the outer peripheral portion of the metal cylindrical body A portion 113a is provided. These three wing portions 113a are portions that are screwed to the inner peripheral surface of the base portion 102 of the pressing body holder 101, and are formed with male screws. In the holder nut 113, the outer peripheral portion of the cylindrical body is held by the work receiving base 115 in a state where the draw bar connector 114 is provided inside the cylindrical body.

  The draw bar connector 114 is a component for connecting the tip of the draw bar DB extending from the main axis of the machine tool to the holder nut 113, and is configured by forming a metal material into a cylindrical shape. The drawbar connector 114 has one end (the left side in the figure) fitted to the end of the drawbar DB with a screw and the other end (the right side in the figure) to the holder nut 113 via a ring plate-like cap 116. It is attached with bolts.

  The workpiece receiving base 115 is a component that supports the workpiece receiving body 117 while accommodating the holder nut 113 in a state in which the holder nut 113 can be advanced and retracted in the central axis direction of the holder nut 113, and is one end (left side in the figure) of a metal cylinder. The part is formed in a flange shape with overhang. In the work receiving base 115, a through-hole through which the three wings 113a pass is formed in a part of a cylindrical body. In addition, the workpiece receiving base 115 has a flange portion 115a projecting outward in the radial direction fitted into the inner peripheral surface of the holder guide 110, and a workpiece receiving member 117 is provided at the end opposite to the flange portion 115a. .

  The workpiece receiver 117 is a part for defining the position in the central axis direction of the workpiece gear 90 held by the pressing body holder 101, and is configured by forming a metal material into a cylindrical shape. The work receiver 117 is formed with a fitting portion 117a that is abutted against the end surface of the workpiece receiving base 115 at one end (the left side in the drawing) and is fitted to the inner peripheral portion. Three workpiece receiving portions 117b are formed in a state protruding from the opposite end. These work receiving portions 117b are portions against which the side surfaces of the workpiece gear 90 are abutted, and are uniformly arranged on the end surface of the work receiving body 117 along the circumferential direction. In the present embodiment, the workpiece receiving portion 117b is formed with a protruding amount at which the pressing body 105 is located at the center portion of the tooth groove of the gear 90 to be processed. In FIG. 2, the workpiece receiver 117 is indicated by a two-dot chain thin line.

(Operation of the gear chuck device 100)
Next, the operation of the gear chuck device 100 configured as described above will be described. The gear chuck device 100 is attached to a spindle (not shown) of a machine tool (for example, a lathe) that performs machining by machining a center hole 92 formed of a through hole at the center of the workpiece gear 90. In this case, in the gear chuck device 100, the connecting portion 112a of the outer cylinder base 112 is attached to the main shaft of the machine tool in a state where the draw bar connecting tool 114 is connected to the distal end portion of the draw bar DB included in the machine tool.

  First, the operator positions the three pressing bodies 105. The positioning of the pressing body 105 is an operation for matching the rotation center axis of the work gear 90 held by the pressing body 105 with the rotation center axis of the lathe main shaft. Specifically, the operator prepares a master gear 90M which is an ideal finished product in which each part such as the tooth groove 90, the tooth surfaces 91a and 91b and the center hole 92 in the gear 90 to be processed is accurately formed. Temporary chucking is performed by the three pressing bodies 105.

  In this case, the operator loosens the set screws 105c and 106e in the gear chuck device 100 so that the pressing bodies 105 and the adjustment bolts 106 are slidable in the axial direction and the circumferential direction, respectively. By rotating the adjustment bolt 106 using a tool (not shown), the adjustment bolt 106 is displaced toward the end face side of the holding portion 104. Thereby, the pressing body 105 can be displaced radially outward of the holding portion 104 in the holding portion 104 when the adjustment bolt 106 is displaced to the end face side of the holding portion 104.

  Next, the operator inserts the master gear 90M into the inside of the three pressing bodies 105 and abuts against the work receiving portion 117b of the work receiving body 117, and then enters the tip of each pressing body 105 into the tooth gap 91. Thus, the pressing surfaces 105a are brought into contact with the tooth surfaces 91a and 91b. In this case, since each pressing body 105 is in a free state, the operator can move each pressing body 105 along the shape and position of the tooth gap 91 while sliding each pressing body 105 in the axial direction and the circumferential direction. The position and orientation can be determined. Further, the operator can project the pressing body 105 from the inner peripheral surface 104b of the holding portion 104, that is, the master gear 90M side, by screwing the adjusting bolt 106 into the holding portion 104.

  Next, the operator pulls the draw bar DB by operating the machine tool and displaces it to the left in the figure (see the broken line arrow in FIG. 1). As a result, in the gear chuck device 100, the pressing body holder 101 is slid to the left side in the drawing via the draw bar connector 114 and the holder nut 113. In this case, the pressing body holder 101 is in contact with the guide-side sliding surface 110a of the holder guide 110 via the holder-side sliding surface 104a in a state where the holding portion 104 is supported by the deformable portion 103 that can be bent and deformed. . For this reason, the holding portion 104 is pushed by the guide-side sliding surface 110a according to the slide displacement of the pressing body holder 101, whereby the holding portion 104 is deformed by the deformation portion 103 (refer to the broken line arrow in FIG. 1) to the master gear 90M side. It is displaced to.

  In this case, since the pressing body 105 is slidably held in the holding portion 104 in the axial direction and the circumferential direction, the pressing body 105 is pressed against the tooth surfaces 91a and 91b of the master gear 90M so as to be axial and circumferential. And the pressing surface 105a is pressed against the tooth surfaces 91a and 91b (see FIGS. 2 and 3). Thus, the master gear 90M is held by the three pressing bodies 105. That is, the draw bar connector 114, the holder nut 113, the pressing body holder 101, and the holder guide 110 correspond to the pressing body pressing means according to the present invention.

  Next, the operator uses a runout measuring device (not shown) such as a dial gauge capable of measuring the runout of the center hole 92 to align the rotation center axis of the master gear 90M with the rotation center axis of the main spindle of the machine tool. . In this case, the operator adjusts the position at which the three pressing bodies 105 hold the master gear 90 </ b> M by adjusting the protruding amounts of the three pressing bodies 105 through the turning operation of the three adjustment bolts 106. The rotation center axis of the master gear 90M can be aligned with the rotation center axis of the main axis of the machine tool.

  Next, when the rotation center axis of the master gear 90M is aligned with the rotation center axis of the main spindle of the machine tool, the operator fastens the set screws 105c and 106e to fix the positions of the pressing body 105 and the adjustment bolt 106. . Thereby, the gear chuck device 100 is fixed at a position where the three pressing bodies 105 can hold the workpiece gear 90 by positioning the rotation center axis of the workpiece gear 90 on the rotation center axis of the main spindle of the machine tool. It becomes. That is, the adjustment bolt 106 corresponds to the pressing body position adjusting mechanism according to the present invention.

  Next, the operator pushes the draw bar DB by operating the machine tool and displaces it to the right side in the figure. As a result, in the gear chuck device 100, the pressing body holder 101 is slid to the right in the drawing via the draw bar connector 114 and the holder nut 113, so that the holding portion 104 is displaced to the holder nut 113 side to hold the master gear 90M. The state is released. Therefore, the operator can finish the positioning operation of the three pressing bodies 105 by taking out the master gear 90M from the inside of the three holding portions 104.

  Next, the operator causes the gear chuck device 100 to hold the workpiece gear 90 in order to machine the center hole 92 in the workpiece gear 90. Specifically, the operator prepares the gear 90 to be processed and holds it on the gear chuck device 100. In this case, the gear 90 to be processed is prepared with heat treatment for forming the tooth gap 91 by gear cutting on the metal material and adjusting the hardness of the tooth surfaces 91a and 91b. That is, in the gear 90 to be processed, the processing of the tooth surfaces 91a and 91b is completed (substantially formed). In this case, in the gear 90 to be processed, it is preferable that the prepared hole of the center hole 92 is processed, but the prepared hole may not be processed.

  Next, the operator inserts the workpiece gear 90 into the inside of the three pressing bodies 105 and abuts against the work receiving portion 117b of the work receiving body 117, and then puts the front end portion of each pressing body 105 into the tooth groove 91. The gear 90 to be processed is temporarily held by causing the pressing surfaces 105a to contact the tooth surfaces 91a and 91b. In this case, when the work gear 90 is a spur gear, the operator inserts the work gear 90 in parallel with the rotation center axis of the main spindle of the machine tool, and when the work gear 90 is a helical gear. The work gear 90 is inserted while rotating about the rotation center axis of the main shaft of the machine tool. Further, in this case, since the deforming portion 103 of the pressing body 105 extends in parallel to the rotation center axis of the main spindle of the machine tool and the holding portion 104 does not grip the workpiece gear 90, the operator is in an open state. 90 can be smoothly inserted.

  Next, the operator pulls the draw bar DB by operating the machine tool and displaces it to the left in the figure (see the broken line arrow in FIG. 1). As a result, in the gear chuck device 100, the pressing body holder 101 is slid and displaced to the left in the drawing via the draw bar connector 114 and the holder nut 113, so that the three pressing bodies 105 are rotated by the gear 90 to be processed. It is pushed out to the center axis side and pressed against the tooth surfaces 91a and 91b of the gear 90 to be machined (see FIGS. 2 and 3).

  In this case, the pressing surface 105a of the pressing body 105 is formed as a flat surface, and the tooth surfaces 91a and 91b are formed as curved surfaces formed of involute curves. For this reason, in the gear chuck device 100, the pressing surface 105a contacts the tooth surfaces 91a and 91b by line contact or surface contact by elastic deformation of at least one of the both, so that the tooth surface 91a is pressed by pressing the pressing surface 105a. , 91b can hold the workpiece gear 90 without causing any press marks or scratches.

  Next, the worker performs machining on the central hole 92 of the workpiece gear 90. Specifically, the operator operates the machine tool to rotate the main shaft to rotate the gear chuck device 100 and the work gear 90 and to bring the cutting tool included in the machine tool into contact with the work gear 90 to thereby make a center hole. 92 is cut. Even in this case, since the pressing surface 105a is in line contact or surface contact with the tooth surfaces 91a and 91b, the gear chuck device 100 causes the tooth surfaces 91a and 91b to be pressed and scratched by the pressing surface 105a. The workpiece gear 90 can be processed without any problems. The gear chuck device 100 holds the workpiece gear 90 through the finished tooth surfaces 91a and 91b, and the center axis of rotation of the workpiece gear 90 by the centering operation by the master gear 90M is the main axis of the machine tool. Since it coincides with the rotation center axis, the center hole 92 can be machined with high accuracy. In this machining, the gear chuck device 100 and the workpiece gear 90 may be fixed, and the machining may be performed by rotating the blade to be machined on the workpiece gear 90.

  Next, when the machining of the center hole 92 of the gear 90 is finished, the operator pushes the draw bar DB by operating the machine tool and displaces it to the right in the figure. As a result, in the gear chuck device 100, the pressing body holder 101 is slid to the right in the drawing via the draw bar connector 114 and the holder nut 113, so that the holding portion 104 is displaced to the holder nut 113 side. The holding state of the master gear 90M is released. Therefore, the operator can finish the machining operation of the center hole 92 to the workpiece gear 90 by taking out the workpiece gear 90 from the inside of the three holding portions 104.

  As can be understood from the above description of operation, according to the above embodiment, the three gears 91 are pressed into the three tooth grooves 91 of the gear 90 to be processed, and the gear 90 to be processed is based on the tooth surfaces 91a and 91b. Therefore, the machined gear 90 can be held with high accuracy with a simple device configuration, and the side of the machined gear 90 is open, so that a wide variety of gears can be used. Processing can be performed. Further, in the gear chuck device 100, since the pressing surface 105a of the pressing body 105 pressed against the tooth surfaces 91a and 91b of the gear 90 to be processed is a flat surface, the pressing marks 105a and 91b of the gear 90 are pressed. And can be held without causing scratches.

  Furthermore, in carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention. In the description of the modified example, the same reference numerals are assigned to the same parts as those in the above-described embodiment that are not newly assigned reference numerals.

  For example, in the above-described embodiment, the gear chuck device 100 is configured to displace and press the pressing body 105 toward the gear 90 to be processed by a pressing body pressing unit including the deformable portion 103 and the guide side sliding surface 110a. However, the pressing body pressing means only needs to be configured to be able to displace the pressing body 105 in the direction of the rotation center axis of the gear to be processed and press it against the tooth surfaces 91a and 91b, and is not necessarily limited to the above embodiment. It is not something.

  For example, as shown in FIGS. 6 and 7, the gear chuck device 200 can be configured by a chuck 210 as a pressing body pressing unit. The chuck 210 is a tool generally used for fixing a workpiece mainly in a machine tool such as a lathe or a milling machine. The chuck 210 is formed on the end surface of the cylindrical chuck body 211 from the outside or the inside of the workpiece. It has a plurality of master jaws 212 (three in this modification) that approach and grip the outer peripheral surface or inner peripheral surface of the workpiece. The master jaw 212 is a component that is radially arranged in the chuck body 211 and is displaced in the radial direction. In FIG. 7, the workpiece receiver 220 is indicated by a two-dot chain thin line.

  The chuck 210 is attached with one workpiece receiver 220 and three holding portions 222 are attached to the chuck 210 via three jaw bases 221, respectively. The workpiece receiver 220 is configured in the same manner as the workpiece receiver 117 in the above-described embodiment, and specifically, the fitting portion 220a corresponding to the fitting portion 117a and the workpiece receiving portion 220b corresponding to the workpiece receiving portion 117b. Are each provided. In the workpiece receiver 220, an air hole 220c is formed so as to penetrate between the end surface of the fitting portion 220a and the tip of the workpiece receiver 220b. The air hole 220c presses and fixes the workpiece gear 90 against a receiving member (not shown) by air supplied from the machine tool side, and uses the pressure change to supply the contact degree of the workpiece gear 90 to the receiving member (parallelism). ) Is a flow path for performing confirmation.

  The three jaw bases 221 are metal parts that hold the holding portion 222, and are attached to the master jaw 212 in the chuck 210. The three holding portions 222 are metal parts corresponding to the holding portion 104 in the above-described embodiment, and are each configured by a block body that is curved in an arc shape in plan view. Similar to the holding unit 104 in the above-described embodiment, these holding units 222 include the pressing body 105 in the holding hole 222c corresponding to the holding hole 104c and the adjustment bolts 106 in the direction perpendicular to the holding hole 222c. Are mounted on the jaw base 221. The holding portion 222 includes an inner peripheral surface 222b corresponding to the inner peripheral surface 104b, like the holding portion 104 in the above embodiment, but the outer peripheral surface 222a is formed in a curved surface corresponding to the jaw base 221. Yes.

  In the gear chuck device 200 configured as described above, the operator operates the machine tool to displace the master jaw in the chuck 210 in the direction of the broken line arrow in FIG. The gear 90 to be machined disposed inside the holding portion 222 can be held by the pressing body 105 by operating the 105c and 106 and the adjusting bolt 106 (see FIG. 3). Further, in this gear chuck device 200, the operator operates a machine tool to discharge air through the air holes 220 c and arranges the workpiece gear 90 that is disposed on the workpiece receiver 220 (not shown). Can be pressed against and held.

  In the gear chuck device 200 according to this modification, the chuck 210 includes three master jaws 212. However, the number of master jaws 212 may be two or four or more. is there. In the gear chuck device 200, air is discharged through the air holes 220c to hold the workpiece gear 90 by the workpiece receiving surface 220b and a receiving member (not shown). Of course, the processed gear 90 may be held.

  Further, in the embodiment and the modified example, the gear chuck devices 100 and 200 are configured to hold the workpiece gear 90 by inserting the pressing body 105 into the three tooth grooves 91 of the workpiece gear 90. . However, the gear chuck devices 100 and 200 may be configured to hold the workpiece gear 90 by inserting the pressing body 105 into at least three tooth grooves 91 in the workpiece gear 90.

  Moreover, in the said embodiment and the said modification, the pressing surface 105a in the pressing body 105 was comprised with the plane. However, the pressing surface 105a of the pressing body 105 may be in contact with the tooth surfaces 91a and 91b by line contact or surface contact. Therefore, the pressing surface 105a of the pressing body 105 can be configured by a curved surface extending along the tooth surfaces 91a and 91b, for example, as shown in FIG. In this case, for example, when the tooth surfaces 91a and 91b are formed as convex curved surfaces, the pressing surface 105a is configured as a concave curved surface extending along the convex curved surface. In addition, the pressing surface 105a can also be comprised by a convex curved surface, and the pressing surface 105a can also be comprised by the curved surface which consists of the same involute curve as the tooth surfaces 91a and 91b in this case.

  In the embodiment and the modification, the pressing surface 105 a of the pressing body 105 is configured to press the tooth surfaces 91 a and 91 b on the pitch circle of the gear 90 to be processed. However, the pressing surface 105a of the pressing body 105 only needs to press the tooth surfaces 91a and 91b, and does not necessarily have to be on the pitch circle. Therefore, the pressing surface 105a can also be configured as a flat surface or a curved surface that presses on a surface other than the pitch circle deviated from the pitch circle on the tooth surfaces 91a and 91b. In this case, when the gear chuck device 100 holds the workpiece gear 90, the gear chuck device 100 may cause a pressing mark or a flaw on the tooth surfaces 91 a and 91 b due to plastic deformation exceeding elastic deformation. It is possible to suppress the occurrence of rattling and abnormal noise when 90 is used.

  In the embodiment and the modified example, the pressing body 105 is slidably held in the holding holes 104c and 222c of the holding portions 104 and 222 in the circumferential direction and the axial direction, and the adjustment bolt 106 is used. Thus, the amount of protrusion from the inner peripheral surfaces 104b and 222b can be adjusted. As a result, the gear chuck devices 100 and 200 can facilitate the gripping and centering work of the master gear 90M. That is, the gear chuck devices 100 and 200 do not need to position and assemble the holding portions 104 and 222 with high accuracy.

  However, the gear chuck devices 100 and 200 can be configured by fixing the pressing body 105 to the holding portions 104 and 222. In this case, the gear chuck devices 100 and 200 need to be positioned and assembled with high accuracy so that the rotation center axis of the gear 90 to be processed matches the rotation center axis of the main axis of the machine tool. However, the holding holes 104c and 222c and the adjusting bolt 106 are not required in the holding portions 104 and 222, and the centering operation using the master gear 90M is not required. Further, the gear chuck devices 100 and 200 are configured to hold the pressing body 105 by providing only the holding holes 104c and 222c in the holding portions 104 and 222, thereby preparing the gear 90 to be attached and detached. it can.

  Further, the gear chuck devices 100 and 200 according to the above-described embodiment and the above-described modified examples can be widely applied to cylindrical gears, specifically, spur gears, helical gears, helical gears, or screw gears. . The gear chuck devices 100 and 200 according to the above-described embodiment and the above-described modified examples can be used by being mounted on various machine tools other than hobbing machines such as a lathe, a milling machine, a machining center, a grinding machine, or a drilling machine. The processing gear 90 can also be used by being mounted on an inspection device and a measurement device that perform inspection and measurement.

DB ... Drawbar,
90 ... Workpiece gear, 90M ... Master gear, 91 ... Goth groove, 91a, 91b ... Tooth surface, 92 ... Center hole,
100 ... gear chuck device,
DESCRIPTION OF SYMBOLS 101 ... Pressing body holder, 102 ... Base part, 103 ... Deformation part, 104 ... Holding part, 104a ... Holder side sliding surface, 104b ... Inner peripheral surface, 104c ... Holding hole, 105 ... Pressing body, 105a ... Pressing surface, 105b ... receiving surface, 105c ... set screw, 106 ... adjustment bolt, 106a ... screw part, 106b ... first guide part, 106c ... pushing part, 106d ... second guide part, 106e ... set screw,
DESCRIPTION OF SYMBOLS 110 ... Holder guide, 110a ... Guide side sliding surface, 111 ... Outer cylinder, 112 ... Outer cylinder base, 112a ... Connection part, 112 ... Through-hole, 113 ... Holder nut, 113a ... Blade | wing part, 114 ... Drawbar connection tool, 115 ... Work receiving base, 115a ... Flange portion, 116 ... Cap, 117 ... Work receiving body, 117a ... Fitting portion, 117b ... Work receiving portion,
200 ... gear chuck device,
210 ... Chuck, 211 ... Chuck body, 212 ... Master jaw,
220 ... Work receiving body, 220a ... Fitting part, 220b ... Work receiving part, 220c ... Air hole, 221 ... Jaw base, 222 ... Holding part, 222a ... Outer peripheral surface, 222b ... Inner peripheral surface, 222c ... Holding hole.

Claims (4)

A gear chuck device that concentrically holds a work gear that is a work piece on a rotation center axis of a main spindle of a machine tool,
A pressing body that is inserted into at least three tooth grooves in the gear to be processed and pressed against two tooth surfaces that form the tooth grooves, respectively.
A holding portion for holding the at least three pressing bodies on the radially outer side of the workpiece gear;
A pressing body pressing means for holding the processed gear by pressing the at least three pressing bodies against the processed gear by displacing the holding portion toward the rotation center axis side of the processed gear;
The pressing pin is
The gear chuck device, wherein the pressing surfaces pressed against the two tooth surfaces are each formed of a flat surface extending flat or a curved surface extending along the two tooth surfaces. The gear chuck device according to claim 1,
The holding part is
A gear chuck device comprising a pressing body position adjusting mechanism that adjusts the positions of the at least three pressing bodies toward the rotation center axis side of the gear to be processed. In the gear chuck device according to claim 1 or 2,
The pressing body is formed in a round bar shape,
The holding part is
A gear chuck device having a holding hole for holding the pressing body in a state in which the pressing body can rotate and slide in the circumferential direction. In the gear chuck device according to any one of claims 1 to 3,
The pressing body pressing means is
A deformable portion formed between the holding portion and a draw bar that advances and retreats along the axial direction of the main axis of the machine tool, and has flexibility to displace the holding portion in the radial direction of the workpiece gear; ,
A gear chuck device comprising: a guide-side sliding surface configured by an inclined surface that is in contact with an outer surface of the holding portion and extends along one of the advance and retreat directions of the draw bar.

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