JP4479549B2 - NC machining equipment - Google Patents

Description

  The present invention relates to an NC machining apparatus (numerically controlled machining apparatus).

Conventionally, an NC processing device (numerical control processing device) processes various parts or products such as a mold of a resin molded product. For example, in the case of a mold, the NC machining apparatus creates a concave or convex mold by processing the surface of the workpiece. When inspecting the shape of a workpiece after processing (in this case, a mold), generally, an inspection operator uses various highly accurate measuring instruments such as calipers to measure the dimensions of various positions on the workpiece. Measure and inspect.
In addition, as a method of measuring various positions on the workpiece using the NC machining apparatus, the workpiece after machining using the touch sensor attached to the spindle of the NC machining apparatus according to the conventional technique described in Patent Document 1 is used. There has been proposed an NC program creation method for measuring coordinates on the surface of the machine and automatically creating NC program data from the measured coordinates.
JP-A-5-108130

When inspection of a workpiece after machining is performed by an inspection operator using a measuring instrument such as a caliper, it is very troublesome. In addition, the accuracy of the inspection result may vary depending on the skill level of the inspection operator.
Further, if the conventional technique described in Patent Document 1 is applied, it is conceivable to inspect the workpiece after machining by measuring the coordinates of various positions on the workpiece after machining by the touch sensor. However, in the method described in Patent Document 1, although the distance in the depth direction (Z-axis direction in FIG. 1) at one point on the surface of the workpiece can be measured, the horizontal direction (X-axis direction in FIG. The distance in the Y-axis direction) cannot be measured. Moreover, it takes a very long time to measure various positions one by one by the operator's operation. For this reason, it is difficult to measure the shape of the workpiece after processing with the technique described in Patent Document 1.
The present invention was devised in view of the above points, and it is possible to more easily measure the shape of a workpiece by an NC machining apparatus equipped with a touch sensor, and for difficult to measure points. It is an object of the present invention to provide an NC machining apparatus capable of appropriate treatment.

As means for solving the above-mentioned problems, the first invention of the present invention is an NC machining apparatus as described in claim 1.
NC machining apparatus according to claim 1 is provided with a touch sensor that outputs in contact with the workpiece after machining a signal related to the shape of the workpiece after processing continuously with the control means and the memory means, after machining of the workpiece It is an NC processing device that can measure the shape.
The said storage means, a measurement program for measuring the shape of the workpiece after machining, the three-dimensional geometric model of the workpiece after machining, and a measurable condition stored.
And said control means, when determining whether to satisfy the measurable conditions at the contact position between the workpiece after machining with the touch sensor on the basis of said measurement program said three-dimensional shape model data, the touch sensor Estimating the angle formed by the sensor approach direction indicating the direction of contact with the workpiece after machining and the surface of the workpiece based on the three-dimensional shape model data at the contact position between the touch sensor and the workpiece after machining, When the angle is equal to or greater than the measurable threshold without adjusting the angle, it is determined that the measurable condition is satisfied, and the operation of the touch sensor is controlled based on the determination result.
Furthermore, a display means for displaying a three-dimensional work shape based on the three-dimensional shape model data is provided, and the display means has a position that satisfies the measurable condition and a position that does not satisfy the measurable condition in the displayed three-dimensional work shape. Are displayed in an identifiable manner.

Further, in the NC processing device according to the present embodiment, the control unit determines that the measurable condition is satisfied when a drag from the workpiece at a contact position between the touch sensor and the workpiece is equal to or greater than a measurable threshold. To do.

Further, in the NC machining apparatus according to the present embodiment, the control means includes a sensor approach direction indicating a direction in which the touch sensor is brought into contact with the workpiece, and a surface of the workpiece at a contact position between the touch sensor and the workpiece. When the formed angle is equal to or greater than the measurable threshold, it is determined that the measurable condition is satisfied.

The second invention of the present invention is an NC machining apparatus as set forth in claim 2 .
The NC processing apparatus according to claim 2, an NC machining apparatus according to claim 1, wherein, in the contact position is determined not to satisfy the measurable conditions, the signal from the touch sensor Discard or remove the touch sensor from the workpiece after processing .

Further, the NC machining apparatus according to the present embodiment, the control means, at the contact position is determined not to satisfy the measurable conditions, reducing the moving speed of the touch sensor.

Further, the NC processing device according to the present embodiment includes a display unit that displays a three-dimensional workpiece shape based on the three-dimensional shape model data, and the display unit is configured to display the three-dimensional workpiece shape as follows: A position that satisfies the measurable condition and a position that does not satisfy the measurable condition are displayed so as to be distinguishable.

The third invention of the present invention is an NC machining apparatus as set forth in claim 3 .
An NC machining apparatus according to a third aspect is the NC machining apparatus according to the first or second aspect , further comprising a spindle on which either the touch sensor or the tool is mounted, and the storage means includes a workpiece. A machining program to be machined is stored.
And the control means is a spindle that indicates a locus of the spindle that is attached with the touch sensor guided by the measurement program, based on a spindle machining locus that indicates a locus of the spindle that is attached by the tool guided by the machining program. Determine the measurement trajectory.

The fourth invention of the present invention is an NC machining apparatus as set forth in claim 4 .
The NC machining device according to claim 4 is the NC machining device according to claim 3 , wherein the control means performs the measurement program based on the shape of the workpiece after machining based on the three-dimensional shape model data. A spindle measurement locus indicating a locus of the spindle on which the touch sensor to be guided is mounted is determined.

The fifth invention of the present invention is an NC machining apparatus as set forth in claim 5 .
The NC processing device according to claim 5 is the NC processing device according to claim 3 or 4 , wherein the control means is configured to determine each position on the workpiece after processing based on the measurable condition. Based on this, a spindle measurement locus indicating the locus of the spindle on which the touch sensor is mounted, which is guided by the measurement program, is determined.

If the NC processing device according to claim 1 is used, the touch sensor can be moved while being in contact with the workpiece, and the shape of the workpiece can be continuously measured using signals continuously output from the touch sensor. (Measurement shape data can be created as a continuous shape rather than measuring the position of each point). Thereby, it can measure in a very short time compared with the method of measuring many points one by one.
It should be noted that the part where measurement is difficult with the touch sensor on the workpiece is measured at the portion where the tip of the touch sensor and the workpiece contact based on the three-dimensional shape model data stored in the storage means and the measurement program. The possible conditions can be determined, and appropriate measures can be taken according to the determination result (for example, measurement is not performed at places where measurement is difficult).
Thereby, the shape of a workpiece | work can be measured more easily.

Further , according to the NC processing apparatus described in the present embodiment , for example, based on the pressing force of the touch sensor and the angle (the angle formed between the direction in which the touch sensor is brought into contact with the work and the work surface at the contact position), The magnitude of the drag generated in the touch sensor (generated in the normal direction of the workpiece surface at the contact position) is obtained. And when the magnitude | size of the calculated | required drag is more than a measurable threshold value, it determines with the site | part on the said workpiece | work satisfying measurable conditions.
Thereby, the location where measurement is difficult can be determined appropriately.

Further, according to the NC machining apparatus according to claim 1, when performing the determination of the measurable conditions, instead of drag, the sensor approaching direction (the direction of contacting the touch sensor to work), the touch sensor and the workpiece Judgment is made using the angle between the contact position and the workpiece surface. And when the said angle is more than a measurable threshold value, it determines with the site | part on the said workpiece | work satisfying measurable conditions.
Thereby, the location where measurement is difficult can be determined appropriately.

Further , according to the NC machining apparatus of the second aspect , for example, at a position that does not satisfy the measurable condition (position on the workpiece), the signal from the touch sensor is discarded (data is captured but not used), or touch Move the sensor away from the workpiece (does not capture data). In this case, since measurement shape data cannot be created for a portion that does not satisfy the measurable condition, three-dimensional shape model data is used for that portion.

Moreover, according to the NC processing apparatus described in the present embodiment, the speed at which the touch sensor is moved is reduced at a position where the measurable condition is not satisfied (position on the workpiece). By moving the touch sensor at a low speed at a location that does not satisfy the measurable condition, the reliability of the signal from the touch sensor can be improved.

In addition, according to the NC machining apparatus of the first aspect, the operator can confirm the position that satisfies the measurable condition and the position that does not satisfy the measurable condition in the three-dimensional workpiece displayed on the display means. It is.

Further, according to the NC machining apparatus according to claim 3, for example, the trajectory of the spindle measured in the horizontal direction of the main shaft working path moving the spindle in the machining program (the direction perpendicular to the direction of pressing the tool to the workpiece) A trajectory. As a result, the spindle measurement trajectory can be automatically determined, which is convenient. In addition, the spindle machining locus can be traced by the spindle measurement locus, and the shape of the workpiece can be measured more easily and more appropriately.

In addition, according to the NC machining apparatus of the fourth aspect of the present invention, the spindle measurement trajectory avoiding the concavo-convex portion is estimated in order to estimate the shape of the workpiece based on the three-dimensional shape model data, for example, to measure the waviness of the workpiece surface. It is possible to automatically determine, or to automatically determine the spindle measurement trajectory in which the uneven portion is selected in order to measure the uneven position on the workpiece surface.

According to the NC machining apparatus of the fifth aspect , for example, the control means automatically obtains the spindle measurement locus satisfying the measurable condition and moves the touch sensor (spindle).
Thereby, it is possible to measure the shape of the workpiece more easily.

The best mode for carrying out the present invention will be described below with reference to the drawings.
● [Appearance of NC processing equipment and characteristics of touch sensor, etc. (Figs. 1 and 2)]
FIG. 1 shows a schematic external view of an embodiment of an NC processing apparatus 10 of the present invention. 2A shows a schematic external view and a schematic characteristic diagram of the touch sensor TS, and FIG. 2B shows a schematic configuration of the NC processing apparatus 10 shown in FIG.
An NC machining apparatus 10 according to the present invention includes a main shaft 20 that can be moved in three orthogonal directions (X axis, Y axis, Z axis), and a tool K (machining means) provided on the movement of the main shaft 20 and the main shaft 20. And a control means 30 for controlling the drive. The movable direction is a direction from the main shaft 20 toward the workpiece W (in the case of FIG. 1, the Z-axis direction) and a direction perpendicular to the direction (in the case of FIG. 1, the X-axis direction or the Y-axis direction). What is necessary is just to be able to move in at least two directions.

  The spindle 20 can be provided with (attached to) at least one of the tool K and the touch sensor TS. As shown in the example of FIG. 1, the spindle 20 includes a spindle 20 of a type in which the tool K or the touch sensor TS is attached to the tool K or the touch sensor TS, and the spindle 20 is replaced with the touch sensor TS. A spindle 20 of a type in which a tool K and a touch sensor TS are attached to each head part on the spindle 20 having a plurality of head parts and the head part facing the workpiece W can be freely changed is also included. Both types of spindles 20 can “select and provide (attach) at least one of the tool K and the touch sensor TS”.

The control means 30 includes an input means 30a for inputting an instruction from an operator, a display means 30b for displaying an input state, a machining state, and the like, a machining program (NC program) for machining the workpiece W, and a workpiece W Storage means 30d (FIG. 2B) storing a measurement program for measuring the shape, three-dimensional shape model data of the workpiece after machining (for example, three-dimensional shape data indicating an ideal shape of the workpiece after machining), and the like. ))). In the schematic configuration shown in FIG. 2B, various interfaces (between the touch sensor TS and the CPU 30c, between the input means 30a and the CPU 30c, etc.) are omitted.
The measurement program includes a spindle measurement locus that indicates the locus of the spindle that moves the touch sensor TS on the workpiece W in the direction perpendicular to the pressing direction, a program that determines the spindle measurement locus, and the movement position and touch of the touch sensor TS. There are a program for creating measurement shape data based on a signal from the sensor TS, a program for correcting the created measurement shape data, and the like.

When the spindle 20 is provided with the tool K, the control means 30 (CPU 30c of the control means 30) can machine the workpiece W fixed to the table TB based on the machining program stored in the storage means 30d. is there.
When measuring the shape of the surface of the workpiece W, the touch sensor TS is pressed against the workpiece W in the direction from the main shaft 20 toward the workpiece W (in the case of FIGS. 1 and 2, the Z-axis direction). The tip portion TSS of the touch sensor TS is biased in the pressing direction (in the case of FIGS. 1 and 2 in the Z-axis direction) by an elastic member such as a spring, and can slide in the pressing direction. When the touch sensor TS pressed against the workpiece W is moved at a predetermined speed in a direction perpendicular to the pressing direction (in the case of FIG. 1, the X-axis direction or the Y-axis direction), the tip TSS is moved to the workpiece W. It moves parallel to the pressing direction according to the unevenness. Then, the touch sensor TS outputs a signal related to the distance (stroke amount or slide amount) that the tip portion TSS has moved according to the unevenness (see FIG. 2A).

  When the spindle 20 is provided with the touch sensor TS, the control means 30 (the CPU 30c of the control means 30) controls the spindle movement means 22 based on the measurement program stored in the storage means 30d and performs machining with the tool K. The tip portion TSS of the touch sensor TS is pressed against the surface of the workpiece W (pressed from a slidable direction), and the touch sensor TS is moved in a direction perpendicular to the pressing direction. And the control means 30 (CPU30c of the control means 30) changes the shape of the workpiece | work W based on the direction and speed which moved the touch sensor TS, and the signal from the touch sensor output according to the unevenness | corrugation of the workpiece | work W. Measurement shape data measured continuously can be created.

● [Example of how to create measurement shape data (Figs. 3 and 4)]
Next, FIG. 3 shows an example of measurement shape data created by measuring the surface of the workpiece W after processing. In the example of FIG. 3 (A), the surface of the workpiece W after processing is formed in a shape in which a substantially rectangular parallelepiped (in this example, a trapezoidal shape having a divergent shape) is left at the center, and the periphery thereof is cut into a concave shape. ing.
For example, the control means 30 presses the tip portion TSS of the touch sensor TS against the point A in FIG. 3A and moves it at the speed V to the point B along the X-axis direction, and the moved speed and direction and the touch sensor TS. The measurement shape data as shown in the example of FIG. The control means 30 knows itself about the X coordinate and the Y coordinate of the main shaft 20 that is moving, by moving the main shaft 20. Further, the Z coordinate of the tip portion TSS of the touch sensor TS can be converted based on the Z coordinate of the spindle 20 and a signal from the touch sensor TS.

Similarly, the control means 30 presses the tip portion TSS of the touch sensor TS against the point C in FIG. 3A and moves it at the speed V to the point D along the Y-axis direction. Based on the signal from the sensor TS, it is possible to create measurement shape data as shown in the example of FIG.
These “measured shape data obtained by continuously measuring the surface shape of the workpiece W” are created in a plurality of directions at a plurality of locations on the workpiece W, and the created plurality of measured shape data are measured positions and If arranged according to the direction, the shape of the workpiece W can be three-dimensionally represented as shown in FIG.

However, when the touch sensor TS is moved on the XY plane while being in contact with the surface of the workpiece W, depending on the uneven shape of the workpiece W, it may be difficult to measure the tip portion TSS in the Z-axis direction. For example, as shown in FIG. 4A, when the touch sensor TS is moved in parallel to the X-axis direction, the tilt angle of the surface of the workpiece W changes extremely with respect to the movement direction of the touch sensor TS or a large descending In the case of inclination (angle 90 ° in the example of FIG. 4A), the tip portion TSS of the touch sensor TS may generate “jump” or “vibration” in a part of the workpiece W. Further, as shown in FIG. 4B, in the case of an upward inclination in which the inclination angle of the surface of the work W is large with respect to the moving direction of the touch sensor TS (an angle of 90 ° in the example of FIG. 4B), the tip TSS. May not be able to follow the surface of the workpiece W.
Therefore, it is determined whether or not measurement is possible according to the uneven shape of the workpiece (whether or not the measurement condition is satisfied), and the touch sensor TS is determined depending on whether or not the measurement condition is satisfied. To control the operation (change the control method for movement). In addition, if the control method related to the movement of the touch sensor TS is changed, the measurement shape data created based on the signal from the touch sensor TS may be affected, so the measurement shape data creation method is also changed.

● [Determination of measurable conditions and processing when the measurable conditions are not satisfied (FIGS. 5 and 6)]
Next, a method for determining the measurable condition will be described with reference to FIGS.
The storage means 30d stores 3D shape model data of the workpiece W. Then, the control means 30 determines the angle (angle θ1) formed by the surface on the workpiece W that the tip portion TSS of the touch sensor TS pressed against the workpiece W from the pressing direction and the pressing direction of the tip portion TSS is 3 It is estimated from the shape of the workpiece W based on the dimensional shape model data.
That is, the control means 30 estimates the shape of the workpiece W from the three-dimensional shape model data, and estimates “to which position” and “from which direction” on the estimated workpiece W to press the tip portion TSS of the touch sensor TS. it can. Further, the pressing force Fs that the tip portion TSS presses against the workpiece W in the pressing direction can be recognized based on a signal from the touch sensor TSS (in accordance with the slide amount of the tip portion TSS, the tip portion This is because the restoring force of an elastic member such as a spring urging the TSS changes).

FIG. 5A shows an example in which the angle (θ1) formed between the surface of the workpiece W in contact with the tip portion TSS and the pressing direction of the tip portion TSS is relatively large, and FIG. An example in which the angle (θ1) is relatively small is shown. FIG. 6 shows an example in which the state of the touch sensor TS that moves the surface of the workpiece W is represented by a three-dimensional shape.
In the example of FIGS. 5A and 5B, the angle between the pressing direction of the tip portion TSS and the part of the workpiece W that is in contact with the tip portion TSS is θ1. The pressing force Fs pressed by the distal end portion TSS in the pressing direction can be decomposed into a force Fa in a direction along the surface of the workpiece W and a force Fb in a direction perpendicular to the surface of the workpiece W. A force Fr that is opposite to the force Fb (normal direction) and has the same magnitude as Fb is the drag Fr that the tip TSS receives from the surface of the workpiece W.
(Magnitude of drag Fr) = (Magnitude of pressing force Fs) * sin (θ1).
When the magnitude of the drag Fr is small, as shown in FIG. 5 (B), the surface is a surface having a small angle (θ1) formed by the surface of the workpiece W and the pressing direction of the tip portion TSS (a surface having a large inclination angle with respect to the moving direction). The tip TSS is in contact. In addition, it is preferable that the control means 30 controls the position of the front-end | tip part TSS of the Z-axis direction so that the pressing force Fs may become a magnitude more than predetermined value.

When the magnitude of the drag Fr is small (when the angle θ1 is small as shown in FIG. 5B), the part on the workpiece W that is in contact with the tip TSS may not be an expected part on the surface of the workpiece W. There is sex. In such a part, it may be difficult to increase the drag Fr (for example, when the angle (θ1) is 0 (zero)).
In order to determine such a part, it may be determined whether or not the magnitude of the drag Fr is equal to or greater than a measurable threshold.
The control means 30 is configured to detect the angle (θ1) between the part and the pressing direction (estimating the shape of the work W based on the three-dimensional shape model data) at the part of the work W that the tip portion TSS of the touch sensor TS contacts. And the magnitude of the drag Fr according to the pressing force Fs is determined. If the magnitude of the drag Fr is equal to or greater than the measurable threshold, it is determined that the measurable condition is satisfied, and the magnitude of the drag Fr is less than the measurable threshold. If it is, it is determined that the measurable condition is not satisfied.

In a region that does not satisfy the measurable condition, the signal from the touch sensor TS is discarded (for example, the signal corresponding to “jump” or “vibration” shown in FIG. 4A is ignored), or the touch sensor TS is removed from the workpiece W. (For example, the “unfollowable” portion shown in FIG. 4B is separated and passed (moved in a direction opposite to the pressing direction so that the tip TSS does not contact the workpiece W)).
In this case, since measurement shape data cannot be created for a part that does not satisfy the measurable condition, for example, measurement shape data of a part that does not satisfy the measurable condition may be created based on the three-dimensional shape model data (in this case) It is possible to identify that the shape of the part is not a shape based on an actual measurement but a shape based on three-dimensional shape model data).

In the above description, the measurable condition is determined by the magnitude of the drag force Fr. However, the measurable condition is determined by estimating the shape of the workpiece W based on the three-dimensional shape model data, and the workpiece W contacting the tip portion TSS. You may make it determine whether the angle ((theta) 1) which a site | part and a pressing direction make is more than a measurable threshold value. In this case, when the angle (θ1) is greater than or equal to the measurable threshold, the measurable condition is satisfied, and when the angle (θ1) is less than the measurable threshold, it is determined that the measurable condition is not satisfied.
When determining the measurable condition, the control means 30 can determine the part on the workpiece W that the tip portion TSS is currently in contact with, as well as the workpiece that is not in contact with the tip portion TSS. It is also possible to determine a part on W (for example, by predicting a destination part). (Because the 3D shape of the workpiece W can be estimated based on the 3D shape model data)

Even if the magnitude or angle (θ1) of the drag Fr is less than the measurable threshold, if the touch sensor TS is moved at a low speed (for example, about several mm / sec), a signal from the touch sensor TS is used. For example, if the angle θ1 is small but the target part is tilted downward, moving the touch sensor TS at a low speed suppresses “jumping” and “vibration”. There are cases where it is possible.
For example, when a low speed threshold value smaller than the measurable threshold value is set and the measurable threshold value> (magnitude of drag Fr or angle (θ1)) ≧ low speed threshold value is satisfied, the signal from the touch sensor TS is discarded or It is also possible to reduce the moving speed without taking off and use the signal from the touch sensor TS to create measurement shape data.
In the example shown in FIGS. 5A and 5B, the speed at which the touch sensor TS is moved in the section A2 is lower than the moving speed in the section A1 or section A3.
The measurable threshold value, the low speed threshold value, and the like for the drag force Fr may be experimentally obtained as appropriate values according to the speed at which the touch sensor TS is moved, the surface finishing accuracy of the workpiece W during processing, the pressing force Fs, and the like. .

● [Display to workers]
The NC processing apparatus 10 described in the present embodiment can measure the shape of the workpiece more easily and can take appropriate measures for a place where measurement is difficult. Since the work shape is conventionally measured by the touch sensor TS provided in the NC processing apparatus 10 which has been performed by a worker using a measuring instrument such as a vernier caliper, the measurement can be performed more easily.
For example, when the measurement shape data is created using the touch sensor TS, the control unit 30 displays the three-dimensional shape workpiece W on the display unit 30b based on the three-dimensional shape model data stored in the storage unit 30d. . Then, the tip measurement trajectory (the trajectory in which the tip sensor TSS is in contact with the workpiece surface by moving the touch sensor TS in a direction perpendicular to the pressing direction is shown on the displayed workpiece W. FIG. (Trajectory indicated by the dotted line in (C)) is displayed, and the portion that does not satisfy the measurable condition in the tip measurement trajectory displayed on the workpiece W is displayed in an identifiable manner. Note that the display of the tip measurement trajectory is omitted, a three-dimensional workpiece W is displayed, and the surface of the workpiece W is either “a position that satisfies the measurable condition” or “a position that does not satisfy the measurable condition”. It may be displayed so that it can be identified.
As a result, the operator is determined to be “satisfied” in the determination of the measurable condition by the control means 30, the part on the tip measurement trajectory that is actually measured, and “not satisfied” is actually determined. It is convenient because it can clearly grasp the location that is not measured.

● [Method for determining the measurement trajectory (tip measurement trajectory and spindle measurement trajectory) (FIG. 7)]
There are various methods for determining the measurement trajectory (the tip measurement trajectory and the spindle measurement trajectory), and examples of the measurement trajectory determination method will be described below in order.
The “tip measurement trajectory” in the description is a trajectory on the workpiece surface with which the tip TSS of the touch sensor TS contacts, and the “spindle measurement trajectory” causes the tip TSS to trace the “tip measurement trajectory”. This is a trajectory of the main spindle for the purpose, and is a trajectory at a position slightly away from the workpiece W (a little away from the pressing direction).

[1. Method instructed by the operator]
In this method, the operator instructs the tip measurement trajectory of the tip portion TSS to be brought into contact with the workpiece surface, and the control means 30 automatically determines the spindle measurement trajectory for moving the spindle from the indicated tip measurement trajectory.
In the three-dimensional shape model data stored in the storage unit 30d, each position of the workpiece W has unique coordinates (X, Y, Z). The operator displays the three-dimensional workpiece W on the display means 30b, and indicates the measurement start position and the measurement end position by specifying an arbitrary position of the displayed workpiece W with an input means such as a mouse. Is possible. The operator can instruct a plurality of measurement trajectories (tip measurement trajectories) by instructing a plurality of combinations of “measurement start position and measurement end position”.

The control means 30 reads the coordinates of the measurement start position designated on the workpiece W displayed on the display means 30b and the coordinates of the designated measurement end position, and sets a straight line connecting the read coordinates to the tip portion measurement locus. Is recognized and stored in the storage means 30d, and a spindle measurement trajectory for moving the spindle 20 is determined and stored in the storage means 30d.
And the control means 30 moves touch sensor TS (spindle 20) based on the spindle measurement locus memorize | stored in the memory | storage means 30d, when producing measurement shape data.

[2. Method by which control means determines based on machining program]
In this method, the control means 30 automatically determines the tip measurement locus from the machining program, and automatically determines the spindle measurement locus from the tip measurement locus.
When the spindle 20 is provided with the tool K (machining means), the control means 30 moves the position of the spindle 20 based on the machining program stored in the storage means 30d, and the work W is moved with the tool K provided on the spindle 20. Can be processed. Therefore, the control means 30 can recognize the spindle machining locus indicating the locus of the tool K (ie, the spindle 20) that moves on the workpiece W when machining the workpiece W. In some cases, the machining result may be measured by tracing the spindle machining locus.

For example, the spindle machining locus has components in the pressing direction (Z-axis direction) in which the tool K is pressed and in the direction (X-axis direction or Y-axis direction) perpendicular to the pressing direction. When determining the spindle measurement trajectory based on the spindle machining locus, for example, the component in the direction perpendicular to the pressing direction (X-axis direction or Y-axis direction) is extracted from the component of the spindle machining locus to determine the spindle measurement locus. Alternatively, the spindle machining locus is projected onto the workpiece surface (projected in the pressing direction) to obtain the tip measurement locus (the tip measurement locus in this case is illustrated by a dotted line in FIG. 7A). It is possible to determine and determine the spindle measurement locus from the tip portion measurement locus.
For example, as shown in the example of FIG. 7A, during machining, the control means 30 moves the tip of the tool K along the locus indicated by the dotted line from the “In” position, and the tool K is moved to the workpiece W in some places. Processing is performed by pressing or the like, and the processing ends at the position “Out”. In this place, the locus in the direction in which the tool K is pressed against the workpiece W is ignored, the tip measurement locus of the component perpendicular to the pressing direction is determined, and the spindle measurement locus is determined from this tip measurement locus.

[3. Method by which control means determines based on uneven portion of workpiece shape]
In this method, the control means 30 automatically determines the tip measurement locus from the target three-dimensional data, and automatically determines the spindle measurement locus from the tip measurement locus.
The control unit 30 recognizes the uneven portion of the shape of the workpiece W based on the three-dimensional shape model data stored in the storage unit 30d, and determines the tip portion measurement locus based on the uneven portion.

For example, when the waviness shape of the surface of the workpiece W is desired to be measured, the tip portion measurement locus that avoids the uneven portion of the workpiece W is determined. The control means 30 recognizes each surface of the workpiece W (surface 1 to surface 11 in the example of FIG. 7B) from the estimated three-dimensional shape of the workpiece W, determines the tip measurement locus on each surface, and determines the main axis. Determine the measurement trajectory.
In the case of the example shown in FIG. 7B, the control means 30 includes the tip portion measurement locus for measuring the surface M1, the tip portion measurement locus for measuring the surface M2, the tip portion measurement locus for measuring the surface M11, and the like. A tip measurement locus (illustrated by a dotted line in FIG. 7B) avoiding the uneven portion is determined, and each spindle measurement locus is determined from these.

For example, when it is desired to measure the position and shape of the uneven portion on the surface of the workpiece W, the tip measurement trajectory passing through the uneven portion of the workpiece W is determined. The control means 30 recognizes each surface of the workpiece W (surface 1 to surface 11 in the example of FIG. 7B) from the estimated three-dimensional shape of the workpiece W, and determines a tip measurement trajectory that passes through a plurality of surfaces. Then, the spindle measurement trajectory is determined.
In the case of the example shown in FIG. 7C, the control means 30 determines the tip measurement trajectory (illustrated by a dotted line in FIG. 7C) passing through a plurality of surfaces, and determines each spindle measurement trajectory therefrom. To do.

[4. Method in which control means determines based on determination result of measurable condition]
In this method, the control means 30 automatically determines the tip measurement locus from the workpiece shape estimated from the target three-dimensional data and the determination result of the measurable condition of each part of the estimated workpiece shape. The spindle measurement trajectory is automatically determined from the measurement trajectory.
The control means 30 can estimate the shape of the workpiece W based on the three-dimensional shape model data stored in the storage means 30d. Then, the control means 30 can determine whether or not each of the estimated parts of the workpiece W satisfies the measurable condition, automatically determines a tip measurement locus that satisfies the measurable condition, It is possible to automatically determine the spindle measurement locus from the tip portion measurement locus.

The NC processing apparatus 10 of the present invention is not limited to the appearance, configuration, determination method, control method, and the like described in the present embodiment, and various modifications, additions, and deletions can be made without changing the gist of the present invention. is there.
Further, the above (≧), the following (≦), the greater (>), the less (<), etc. may or may not include an equal sign.

1 is a schematic external view of an embodiment of an NC processing apparatus 10 of the present invention. FIG. 2 is a diagram showing a schematic appearance and characteristics of a touch sensor TS and a schematic configuration of the NC processing apparatus 10. It is a figure explaining the example of the method of producing measurement shape data. It is a figure explaining an example in case measurement is difficult in tip part TSS of touch sensor TS. It is a figure explaining the determination method of measurable conditions. It is a figure which shows the example which represented the mode of touch sensor TS which moves the surface of the workpiece | work W with the three-dimensional shape. It is a figure explaining the example of the determination method of a measurement locus | trajectory (a tip part measurement locus | trajectory and a spindle measurement locus | trajectory).

DESCRIPTION OF SYMBOLS 10 NC processing apparatus 20 Main shaft 22 Main shaft moving means 30 Control means 30a Input means 30b Display means 30c CPU
30d storage means Fs pressing force Fr drag K tool (machining means)
TB table TS Touch sensor TSS Tip W Work

Claims (5)

A touch sensor for outputting in contact with the post-processing work signals concerning the shape of the workpiece after processing continuously and the control means and memory means, a measurable NC machining apparatus the shape of the workpiece after processing ,
Wherein the storage means, a measurement program for measuring the shape of the workpiece after machining, the three-dimensional geometric model of the workpiece after machining, a measurable condition is stored,
The control means includes
When determining whether to satisfy the measurable conditions at the contact position between the workpiece after machining with the touch sensor on the basis of said measurement program said three-dimensional shape model data, contact the touch sensor on the workpiece after processing Estimating the angle formed by the sensor approach direction indicating the direction to be moved and the surface of the workpiece based on the three-dimensional shape model data at the contact position between the touch sensor and the workpiece after processing, and adjusting the angle If the angle is equal to or greater than the measurable threshold, it is determined that the measurable condition is satisfied, and the operation of the touch sensor is controlled based on the determination result.
Furthermore, a display means for displaying a 3D workpiece shape based on the 3D shape model data is provided,
The display means includes
In the displayed three-dimensional workpiece shape, a position that satisfies the measurable condition and a position that does not satisfy the measurable condition are displayed in an identifiable manner.
NC processing device characterized by that. The NC processing device according to claim 1 ,
The control means discards the signal from the touch sensor or causes the touch sensor to leave the workpiece after processing at a contact position determined not to satisfy the measurable condition.
NC processing device characterized by that. The NC processing device according to claim 1 or 2 ,
A spindle for mounting either the touch sensor or the tool;
The storage means stores a machining program for machining a workpiece,
The control means is a spindle measurement indicating a locus of the spindle attached with the touch sensor guided by the measurement program based on a spindle machining locus showing a locus of the spindle attached with the tool guided by the machining program. Determine the trajectory,
NC processing device characterized by that. The NC processing device according to claim 3 ,
It said control means, based on the shape of the workpiece after processing by the three-dimensional shape model data, determines the spindle measurement trajectory indicating the locus of the main shaft equipped with the touch sensor guided by said measurement program,
NC processing device characterized by that. The NC processing device according to claim 3 or 4 ,
The control means determines a spindle measurement trajectory indicating a trajectory of the spindle equipped with the touch sensor guided by the measurement program based on a determination result of each position on the workpiece after machining based on the measurable condition. To
NC processing device characterized by that.

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