JP2019177423A - Nc processing apparatus and method of manufacturing processed component - Google Patents

Abstract

To provide an NC processing apparatus and a method of manufacturing a processed component that enable position data having higher reliability than before to be measured at each measurement point of a work having been processed.SOLUTION: An NC processing apparatus 10 and a method of manufacturing a processed component according to the present invention are characterized in that: a target 49 is fitted to a movable part of the NC processing apparatus 10 together with a probe 45; and position data on the target 49 is measured by a laser trucker 50 as substitute data for position data on each measurement point of a workpiece W. Namely, the laser trucker 50 different from position sensors 21S-24S used for processing the workpiece W measures position data at each measurement point of the workpiece W, so position data having higher reliability than before can be measured.SELECTED DRAWING: Figure 1

Description

  In the present invention, after machining a workpiece with a machining tool by an NC program, a probe is attached instead of the machining tool, and the tip of the probe is sequentially brought into contact with a plurality of measurement points of the workpiece, and each of these measurement points is measured. The present invention relates to an NC processing apparatus that measures the position data of and a manufacturing method for manufacturing a processed part using such an NC processing apparatus.

  Conventionally, in this type of NC machining apparatus, a position sensor of a servo motor provided for controlling the position of a machining tool is also used for measuring position data of a measurement point using a probe (for example, a patent) Reference 1). The position data of the measurement point is used for workpiece shape inspection.

Japanese Patent No. 5359651 (paragraph [0002])

  However, in the above-described conventional NC machining apparatus, the position sensor used when machining the workpiece and the position sensor used for the shape inspection of the workpiece after machining are the same, and therefore erroneous due to erroneous detection of the position sensor. Even if a workpiece is machined into a shape, it may occur that it cannot be found by shape inspection.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an NC machining apparatus capable of measuring position data with higher reliability than before with respect to each measurement point of a workpiece after machining. To do.

  In order to achieve the above object, according to the first aspect of the present invention, after machining a workpiece with a machining tool by an NC program, a probe is attached instead of the machining tool, and the tip of the probe is attached to the tip of the workpiece. In an NC processing apparatus that sequentially contacts a plurality of measurement points and measures the position data of each measurement point, the target attached to the movable part of the NC processing apparatus together with the probe, and the position data of the target are measured. A laser tracker, a trigger signal output unit that outputs a trigger signal based on a contact detection signal output from the probe each time the tip of the probe contacts each measurement point, and the trigger signal is output Each time, the position data of the target measured by the laser tracker An NC processing apparatus and a position data storage means for storing as a substitute data position data.

  In the invention of claim 2, the NC program is changed when a change accompanying a change in a three-dimensional vector from the tip of the probe to the target is made after the measurement of the position data of the target is started. The NC processing device according to claim 1, further comprising first reference data acquisition means for measuring the position data of the target with respect to the common measurement point before and after and storing the target data in the position data storage means.

  In the NC program according to the present invention, when the workpiece is moved after the measurement of the position data of the target is started, the three measurement points that are common on the workpiece are measured before and after the movement. The NC processing apparatus according to claim 1, further comprising a second reference data acquisition unit that measures target position data and stores the target position data in the position data storage unit.

  According to a fourth aspect of the present invention, the NC program includes a two-time contact process in which the tip of the probe is brought into contact with the workpiece twice at the measurement point. A first abutting process for obtaining the probe control position data when the abutting detection signal is changed at the time of the separation, and a first abutting process for pressing the probe tip against the workpiece and separating the probe tip position; A second abutting process for moving the tip of the probe to a position that just abuts against the workpiece based on the data, and the trigger signal output unit outputs the trigger signal output from the probe in the second abutting process. 4. The NC machining apparatus according to claim 1, wherein a trigger signal is output based on the contact detection signal.

  Here, “moving the tip of the probe to a position just in contact with the workpiece” means “moving the tip of the probe to a position that does not deviate as much as possible from the position at the moment of contact with the workpiece”. .

  The invention according to claim 5 is provided with error calculation means for calculating an error between the dimension of the workpiece and the design dimension based on the position data of the target. It is NC processing apparatus as described in.

  According to a sixth aspect of the present invention, after a workpiece is machined by a machining tool of an NC machining apparatus, a target is attached together with a probe to a movable part of the NC machining apparatus instead of the machining tool, and position data of the target is obtained by a laser tracker. The probe is brought into a measurable state, and the tip of the probe is sequentially brought into contact with a plurality of measurement points of the workpiece. At that time, the position data of the target is detected by the laser tracker based on the contact detection signal output from the probe. Is measured, and based on the target position data, it is determined whether or not the workpiece is a processed part having a shape as designed, and the processed part is manufactured.

  In the NC machining apparatus and the machining part manufacturing method of the present invention, the target is attached to the movable part of the NC machining apparatus together with the probe, and the position data of the target is measured by the laser tracker as substitute data for the position data of each measurement point of the workpiece. Is done. That is, according to the present invention, the position data of each measurement point of the workpiece is measured by a laser tracker that is different from the position sensor used when processing the workpiece. Measurement can be performed. Compared to the case where an operator manually places targets at all measurement points set on a workpiece and measures position data with a laser tracker, accurate measurement of position data takes less time. It can be performed. Furthermore, after the workpiece is machined by the NC machining device, position data can be measured while the workpiece is fixed to the jig, so additional machining is possible when the workpiece has not been machined correctly. Can be done quickly and easily. In this case, as in the fifth aspect of the invention, if an error calculating means for calculating an error between the workpiece dimension based on the target position data and the designed dimension is provided, it is quickly determined whether or not to perform additional machining. Can be judged.

  According to the second aspect of the present invention, the shape of the entire workpiece can be accurately specified even if the posture change or replacement of the probe is performed after the start of measurement of the target position data.

  According to the invention of claim 3, even if the workpiece is moved after the measurement of the target position data is started, the shape of the entire workpiece can be accurately specified. As a result, it is possible to specify the shape of a workpiece that is so large that position data cannot be measured without moving the workpiece.

  According to the invention of claim 4, the contact state of the probe with the workpiece is stable, and stable position data can be measured.

The perspective view of NC processing device concerning a 1st embodiment of the present invention. Block diagram of NC machining equipment Perspective view of workpiece processed by NC processing equipment NC program flowchart for machining Side view of the probe Flow chart of NC program for measurement Flowchart of the double hit process Block diagram of a personal computer running a data analysis program The perspective view of NC processing device concerning a 2nd embodiment Block diagram of a personal computer running a data analysis program The perspective view of the probe and workpiece | work of NC processing apparatus concerning 3rd Embodiment

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. An NC processing apparatus 10 according to the present invention includes the processing machine main body 11 shown in FIG. 1, a laser tracker 50, and a personal computer 69 shown in FIG. As shown in FIG. 1, the processing machine main body 11 includes a workpiece jig 19 extending in the front-rear direction and a first movable base 12 standing upright across the workpiece jig 19. The first movable base 12 is slidably engaged with rails 12R, 12R extending in the front-rear direction on both sides of the work jig 19. Further, a second movable base 13 extending in the left-right direction is assembled to the front surface of the pair of leg portions 12K, 12K in the first movable base 12 so as to be movable up and down. Further, a third movable base 14 is assembled at the middle portion in the left-right direction of the second movable base 13 so as to be capable of linear movement left and right. A tool holding portion 15 generally called a “main shaft” protrudes downward from the third movable base 14. The tool holding part 15 is provided with a tapered hole (not shown) opened downward in the center, and rotates around the tapered hole.

  As shown in FIG. 2, the processing machine body 11 includes first to fourth servomotors 21 to 24 as drive sources. These first to fourth servomotors are provided with position sensors 21S to 24S, respectively. Then, the position of the first movable base 12 is controlled by the first servo motor 21, the position of the second movable base 13 is controlled by the second servo motor 22, and the position of the third movable base 14 is moved by the third servo motor 23. In addition, the tool holding unit 15 is rotationally driven by the fourth servo motor 24.

  As shown in FIG. 2, the controller 30 of the processing machine main body 11 receives servo amplifiers 21A to 24A for driving the first to fourth servo motors 21 to 24 and command data to the servo amplifiers 21A to 24A. A main control unit 31 is provided. The main control unit 31 includes a memory 32 and a CPU 33. The CPU 33 executes the machining NC program stored in the memory 32, so that the workpiece W can be machined into a machined part having a predetermined shape.

  3A shows the workpiece W before being processed by the processing machine body 11, and FIG. 3B shows the workpiece W after being processed by the NC processing apparatus 10. Yes. The unprocessed workpiece W is, for example, an aluminum plate having a thickness of 80 mm or more, a width of 500 mm or more, and a length of 2000 mm or more, and fixing screw holes (not shown) are formed at a plurality of positions on the lower surface. A workpiece W, which is an aluminum plate, is fixed on a support base 99 provided in the work jig 19 shown in FIG. 1, and the support base 99 is fixed to the main body of the work jig 19.

  The processing machine main body 11 cuts the entire workpiece W in the thickness direction, the horizontal direction, and the longitudinal direction, and then processes the plurality of quadrangular concave portions 91 in the vertical and horizontal directions as shown in FIG. As a result, the workpiece W has a structure in which the lattice-like ribs 93 having a uniform wall thickness are provided on the bottom plate 92 having a uniform thickness. The corners of the opening edge of each recess 91, the corners of the upper surface outer edge of the entire workpiece W, the corners of the lower surface outer edge of the entire workpiece W, and the corners of the four corners of the entire workpiece W are respectively C Perform chamfering. As described above, the processing of the workpiece W is completed, and the workpiece W processed into a shape within a tolerance that is predetermined with respect to the design shape becomes a completed processed part.

  An example of a processing tool 40 used when processing the workpiece W is shown on the left side of FIG. Each processing tool 40 has a structure including a tool main body 40B at the lower end portion of the tapered shaft portion 40A, and the tapered shaft portion 40A is fitted and attached to the tapered hole of the tool holding portion 15. In FIG. 1, an end mill is shown as an example of a processing tool, but a milling cutter, a chamfering tool, or the like may be used in addition to the end mill.

  FIG. 4 shows an example of a machining NC program PG1 for machining the workpiece W. For example, when the CPU 33 executes the machining NC program PG1, the tool data is read from the data table stored in the memory 32 (S10). In the data table, a processing tool 40 and a probe 45 as an inspection tool, which will be described later, are registered by a tool number. The tool name, the length to the tip of the tool, the radius of rotation, etc. are associated with the tool number. Tool data is set.

  When the reading of the tool data (S10) is completed, the processing tool 40 to be attached to the tool holding unit 15 is displayed on the monitor 34 provided in the controller 30 (S11). Therefore, when the operator attaches the designated processing tool 40 to the tool holding unit 15 and turns on the confirmation button provided on the console 35 of the controller 30 (YES in S12), the attached processing tool 40 is used. Processing is executed (S13). When the machining process is completed, the machining tool 40 to be attached next to the tool holding unit 15 is displayed on the monitor 34 (S14), and the same operation is repeated thereafter. When all the machining processes are completed, a message notifying that the machining has been completed is displayed on the monitor 34, and the machining NC program PG1 is terminated. The change of the tool may be automatically performed by a tool changer (not shown).

  Now, when the machining NC program PG1 is finished, as shown in FIG. 1, the probe 45 is attached to the tool holding unit 15, and the position data is measured using the laser tracker 50. As a specific example of the probe 45, FIGS. 5A to 5C show first to third probes 45A to 45C. Hereinafter, when the first to third probes 45A to 45C are not distinguished, they are simply referred to as probes 45.

  The probe 45 has a probe main body 40C at the lower end of a tapered shaft portion 40A having the same shape as that of the processing tool 40. Like the processing tool 40, the probe 45 is fitted and mounted in a tapered hole (not shown) to hold a tool holding portion. 15 is attached. In the probe main body 40C, a detection bar 46 extends from a base portion 42 fixed to the tapered shaft portion 40A, the detection bar 46 is supported by the base portion 42 in a movable state, and an elastic member provided in the base portion 42 is used. The detection bar 46 is urged to the origin position. Then, in the first and second probes 45A and 45B, the detection bar 46 moves so as to move linearly from the origin position toward the base portion 42 side, and in the third probe 45C, the detection bar 46 is at the upper end portion. Rotate in an arbitrary direction from the origin position around the center.

  A sphere 47 is provided at the tip of the detection bar 46. Further, in the second probe 45B, orthogonal bars 46A and 46A protrude in four directions from a position near the tip of the detection bar 46, and a sphere 47 is also provided at the tip of the orthogonal bar 46A. Then, when the spheres 47 are pressed against the workpiece W, the detection bar 46 moves from the origin position. Then, the contact detection signal output from the probe 45 to the main control unit 31 is turned on.

  A target 49 is fixed to the base portion 42 of each probe 45. The target 49 is generally called a reflector, and has three orthogonal reflecting surfaces, and reflects light in the incident direction regardless of which direction the light enters the target 49. ing. Here, when the probe 45 is attached, the tool holding unit 15 is fixed to be non-rotatable by a servo lock by the fourth servo motor 24 or a brake provided in the fourth servo motor 24. The tip of the probe 45 and the target 49 are kept constant in a three-dimensional relative positional relationship, that is, not accompanied by a change in the three-dimensional vector from the tip of the probe 45 to the target 49. The probe 45 and the target 49 are translated by the processing machine body 11. Thereby, by measuring the position data of the target 49, the substitute data of the position data of the measurement point on the workpiece W can be measured.

  The position data of the target 49 is measured by the laser tracker 50. The laser tracker 50 is commercially available from Leica, API (Automated Precision Inc.), FARO, and the like. Specifically, the laser tracker 50 of the present embodiment includes a head portion 64 that can pivot on an upper end portion of a stand 63 with casters 62, and a pair of opposing walls 64A and 64A provided on the head portion 64. A horizontal rotation shaft (not shown) of the mirror 54 (see FIG. 2) is interposed between them. Then, the head portion 64 is rotated about the vertical axis with respect to the stand 63 by the θ-axis motor 55 shown in FIG. 2, and the mirror 54 is rotated about the horizontal axis with respect to the head portion 64 by the γ-axis motor 56. To do.

A half mirror 52 and a laser light source 51 are provided below the mirror 54 in the laser tracker 50, and a laser light receiving unit 53 is provided on the side of the half mirror 52.
When the laser tracker 50 is operated, the orientation of the mirror 54 is changed by the θ-axis motor 55 and the γ-axis motor 56 so that the mirror 54 always faces the direction facing the target 49. In addition, the laser tracker 50 determines the position of the target 49 in the three-dimensional space, the three-dimensional position data (the distance L to the target 49, the turning angle θ of the mirror 54, and the vertical swing angle γ of the mirror 54 ( L, θ, γ). Then, the position data measured when receiving the trigger signal from the outside is stored in the memory 61.

  The turning angle θ and the longitudinal oscillation angle γ are calculated from detection results of position sensors 55S and 56S (for example, an encoder, a resolver, etc.) provided in the θ-axis motor 55 and the γ-axis motor 56, and the distance L is generally Measured by the principle of a typical laser distance sensor. The position data is written into the memory 61 by the CPU 60 provided in the laser tracker 50. The CPU 60 and the memory 61 when writing the position data in the memory 61 correspond to the “position data storage means” according to the present invention.

  Among the workpieces W shown in FIG. 3 (B), for example, a plurality of measurement points for measuring position data using the laser tracker 50 are provided on each inner side surface and bottom surface of each recess 91, and A plurality of each of the lower surface, each side surface, and the upper surface of the workpiece W are set, and at least one is set for all the chamfered surfaces that have been chamfered. For example, 500 to 1000 measurement points are set in total. Yes.

  FIG. 6 shows an example of a measurement NC program PG2 for measuring the position data of these measurement points. For example, when the CPU 33 executes the measurement NC program PG2, the tool data of the first to third probes 45A to 45C used in the measurement NC program PG2 is read from the data table (S20). Then, in the following process, a “twice contact process” in which the tip of any one of the first to third probes 45A to 45C is brought into contact with each measurement point of the workpiece W twice. And a trigger signal is output to the laser tracker 50.

  The “twice application process” is performed as follows. That is, as shown in FIG. 7, with respect to each measurement point of the workpiece W, the tip of the probe 45 is measured with respect to the measurement point from a position away from the air toward the measurement point. It moves at a high speed (S50). When the tip of the probe 45 comes into contact with the measurement point of the workpiece W, that is, when the contact detection signal from the probe 45 is turned on (YES in S51), the probe 45 is moved away from the measurement point at a low speed. (S52). When the tip of the probe 45 is separated from the measurement point of the workpiece W, that is, when the contact detection signal from the probe 45 is turned off (YES in S53), the control position data for the tip of the probe 45 at that time (YES) Position data based on the position sensors 21S to 24S of the first to fourth servomotors 21 to 24) are temporarily stored in the cache memory of the CPU 33 (S54).

  Next, the tip of the probe 45 is again approached at a low speed from the position stored as the control position data (S55), and when the contact detection signal is turned on (YES in S56), the probe 45 is moved. Stop (S57). As a result, the tip of the probe 45 is stopped at a position where it just contacts the workpiece W. That is, the tip of the probe 45 is stopped at a position that does not deviate as much as possible (within the range of detection performance of the probe 45) from the position at the moment of contact with the workpiece W. Further, based on the contact detection signal at this time, a trigger signal is output to the laser tracker 50 (S58), and the position data of the measurement point on the workpiece W that can be calculated by a known technique in the processing machine body 11 is obtained. Store in the memory 32 (S59). Note that the CPU 33 when executing the processing of step S58 described above corresponds to the “trigger signal output unit” according to the present invention.

  The overall flow of the measurement NC program PG2 is as follows. As shown in FIG. 6, when the measurement NC program PG2 is executed, as described above, after reading the tool data (S20), an instruction message for attaching the first probe 45A to the tool holding unit 15 is displayed on the monitor 34 (see FIG. 6). S21). Therefore, when the operator attaches the designated first probe 45A to the tool holding unit 15 and turns on the confirmation button of the console 35 (YES in S22), a first reference data acquisition process (S23) is performed. In the first reference data acquisition process (S23), the above-described “twice application process” is performed on the reference point P1 set in advance on the workpiece W. For example, as shown in FIG. 3B, the reference point P <b> 1 is arranged at the center in the longitudinal direction on the chamfered surface of one long side at the outer edge of the upper surface of the workpiece W. Then, the “double hitting process” is performed on the reference point P 1, and the position data corresponding to the reference point is measured by the laser tracker 50 and stored in the memory 61.

  Following the first reference data acquisition process (S23), a first position data acquisition process (S24) is performed. In this first position data acquisition process (S24), using the first probe 45A, for example, the measurement points on the bottom surface of all the recesses 91, all the measurement points on the top surface of the entire workpiece W, and the top surface of the workpiece W A “twice contact process” is performed on all chamfered measurement points arranged on the side, and the position data corresponding to each measurement point is measured and stored in the laser tracker 50. At that time, the processing machine body 11 stores in the memory 32 the position data of the measurement points on the workpiece W that can be calculated by a known technique.

  Next, an instruction message for attaching the second probe 45B to the tool holding unit 15 is displayed on the monitor 34 (S25). When the confirmation button is turned on (YES in S26), a second reference data acquisition process (S27) is performed. . In the second reference data acquisition process (S27), the same process as the first reference data acquisition process (S23) is performed, and the position data corresponding to the reference point P1 is measured and stored in the laser tracker 50. Next, the second position data acquisition process (S28) is performed, the sphere 47 of the orthogonal bar 46A of the second probe 45B is brought into contact with all the measurement points on the lower surface of the entire workpiece W, and the position data corresponding to these measurement points is obtained. The laser tracker 50 measures and stores the data, and the processing machine main body 11 stores the measurement point position data in the memory 32.

  Next, an instruction message for attaching the third probe 45C to the tool holding unit 15 is displayed on the monitor 34 (S29). When the confirmation button is turned on (YES in S30), a third reference data acquisition process (S31) is performed. The position data corresponding to the reference point P1 is measured by the laser tracker 50 and stored in the same manner as in the first and second reference data acquisition processes (S23, 27). Next, the third position data acquisition process (S32) is performed, and the laser tracker 50 measures position data corresponding to the measurement points on the inner side surfaces of all the recesses 91 and all the measurement points on each side surface of the entire workpiece W. The processing machine body 11 stores the measurement point position data in the memory 32. When the third position data acquisition process (S32) is accommodated, the measurement NC program PG2 ends. In the present embodiment, the CPU 33 when executing steps S23, S27, and S31 described above corresponds to the “first reference data acquisition unit” according to the present invention.

  As shown in FIG. 2, the personal computer 69 is connected to the laser tracker 50 and the controller 30, and when the measurement NC program PG2 ends, the position data stored in the memory 61 of the laser tracker 50, the processing machine, and the like. The position data stored in the memory 32 of the main body 11 is captured. Further, the personal computer 69 captures the three-dimensional CAD data (that is, design data) of the workpiece W. Then, by executing a predetermined data analysis program, the personal computer 69 functions as the coordinate conversion unit 70, the probe difference correction unit 71, the sphere contact position correction unit 72, etc. shown in FIG. It is determined whether or not it has been processed into a street shape.

  In the following description, the position data stored in the memory 61 of the laser tracker 50 is appropriately referred to as “external measurement position data”, and the position data stored in the memory 32 of the processing machine body 11 is appropriately This is referred to as “internal measurement position data”.

  A coordinate conversion unit 70 in FIG. 8 takes in external measurement position data specified by the coordinate system (L, θ, γ) of the laser tracker 50 and converts the data into data of a coordinate system of three orthogonal axes.

  The probe device difference correction unit 71 receives external measurement position data of the orthogonal three-axis coordinate system from the coordinate conversion unit 70, and from the position of the target 49 when the sphere 47 of the second probe 45B is brought into contact with the reference point P1. The vector up to the position of the target 49 when the sphere 47 of the first probe 45A is brought into contact with the reference point P1 is obtained as a “second probe correction vector”, and the sphere 47 of the third probe 45B is determined as the reference point. A vector from the position of the target 49 when it is brought into contact with P1 to the position of the target 49 when the sphere 47 of the first probe 45A is brought into contact with the reference point P1 is referred to as a “third probe correction vector”. Ask. Then, correction is performed by adding the second probe correction vector to each position vector of each external measurement position data measured by the second probe 45B, and each position vector of each external measurement position data measured by the third probe 45C. Correction is performed by adding a correction vector for the third probe. As a result, the external measurement position data measured by the second and third probes 45B and 45C are all converted to the external measurement position data measured by the first probe 45A. That is, actually, the external measurement position data measured using the first to third probes 45A, 45B, and 45C are all measured by the probe instrument difference correction unit 71 using only the first probe 45A. Aligned to the external measurement position data.

  Next, the spherical contact position correction unit 72 corrects the difference in contact of the probe 45 with the work W on the sphere 47 so that all external measurement position data is applied to the work W at the center point of the sphere 47 of the probe 45. Convert to position data when touching. Specifically, it can be determined from the design orientation of the surface of the workpiece W which position of the sphere 47 of the probe 45 abuts on which position the workpiece W abuts at each measurement point. Further, the radius of the sphere 47 can be known from the specifications of the probe 45 or the like. Then, the sphere contact position correcting unit 72 obtains a vector from the contact point of the sphere 47 to the center point as a radius correction vector for each measurement point as a radius correction vector, and each external after correction by the probe instrument difference correcting unit 71 is corrected. Correction is performed by adding a radius correction vector to each position vector of the measurement position data.

  In other words, the correction is performed by the probe instrument difference correction unit 71 and the sphere contact position correction unit 72, so that all of the external measurement position data makes the center point of the sphere 47 of the first probe 45A contact the work W. Time target 49 position data (this is appropriately referred to as “coordinate unified position data”), and the coordinate unified position data of these targets 49 are substantially on the workpiece W measured by the laser tracker 50. The position data of the measurement point. Then, the data comparison / discriminating unit 73 includes so-called raw data before correction of the external measurement position data, the coordinate unified position data after correction, the internal measurement position data measured by the processing machine body 11, and the three-dimensional data. The CAD data is collected in the inspection data file F1 and stored in the memory of the personal computer 69.

  Further, the data comparison / determination unit 73 takes in external measurement position data, which is coordinate coordinate position data, internal measurement position data, and three-dimensional CAD data. Then, by a known technique, a machining error is obtained from the shape of the workpiece W specified from the internal measurement position data and the shape of the workpiece W specified from the three-dimensional CAD data, and the machining error is set in advance. Sub-shape determination is performed to determine whether or not the error range is entered. Similarly, a machining error is obtained from the shape of the workpiece W specified from the external measurement position data and the shape of the workpiece W specified from the three-dimensional CAD data, and the machining error is set in a preset allowable error range. A main shape determination is performed to determine whether or not the vehicle is in. In the main shape determination, when the determination result that the machining error is within the allowable error range is obtained, the inspection data file F1 is stored on the disk as inspection data. Then, along with the disk, the workpiece W is fed to the subsequent process as a processed part manufactured by the NC processing apparatus 10.

  On the other hand, in the main shape determination, when the determination result that the processing error is not within the allowable error range is obtained, if the processing error can be corrected, the additional processing part for the correction When the machining error cannot be corrected, a message notifying that effect is displayed on the monitor 76. When the workpiece W is additionally machined, the above-described measurement NC program PG2 is side-executed, and the inspection data file F1 after the additional machining is created and stored. The determination result of the sub-shape determination is displayed on the monitor 76 as reference information.

  As described above, in the NC processing apparatus 10 and the manufacturing method of the processed part of the present embodiment, the target 49 is attached to the movable part of the NC processing apparatus 10 together with the probe 45, and the position data of the target 49 is measured for each workpiece W. It is measured by the laser tracker 50 as substitute data for the point position data. That is, according to the present embodiment, the position data of each measurement point of the workpiece W is measured by the laser tracker 50 different from the position sensors 21S to 24S used when the workpiece W is processed. It becomes possible to measure position data with high reliability.

  Compared to the case where the operator manually places the target 49 at all the measurement points set on the workpiece W and measures the position data with the laser tracker 50, the accurate position can be obtained in a short time. Data can be measured. Further, when the position data is measured, the contact process between the probe 45 and the workpiece W is stabilized since the contact process between the probe 45 and the workpiece W is performed twice. Data can be measured. In addition, since the probe device difference correction unit 71 is provided, the shape of the entire workpiece W can be accurately specified even if the probe 45 is replaced after the measurement of the position data is started.

  Further, after the workpiece W is machined by the NC machining apparatus 10, the position data can be measured while the workpiece W is fixed to the workpiece jig 19, so that the workpiece W is machined correctly. If not, additional processing can be performed quickly and easily. Furthermore, in the present embodiment, it is quickly determined whether or not to perform additional machining in which an error between the dimension of the workpiece W based on the position data of the target 49 and the designed dimension is calculated by the personal computer 69 provided in the NC machining apparatus 10. Judgment can be made.

[Second Embodiment]
FIG. 9 shows the processing machine main body 11V of the present embodiment. The processing machine main body 11V is attached so that the arm 14A is suspended from the third movable base 14 of the processing machine main body 11 of the first embodiment, and the revolving part 14B is revolved horizontally at the lower end of the arm 14A. It has been. Moreover, the lower end part of the turning part 14B is divided into two branches, and a wrist 14C is attached to the inside of the two-branch structure part so as to be rotatable around a horizontal axis. The tip of the list 14C is a tool holding portion 15 to which the processing tool 40 or the probe 45 described above can be attached. Furthermore, the workpiece jig 19V includes, for example, a support table 19W that moves back and forth by a ball screw mechanism, and the workpiece W is supported by a support base 99 fixed on the support table 19W.

  In the NC processing apparatus 10V of this embodiment, when measuring the position data of the measurement point of the workpiece W, the posture of the probe 45 is changed as appropriate, and the tip of the probe 45 is brought into contact with an arbitrary position of the workpiece W. be able to. When the posture of the probe 45 is changed, the tip of each probe 45 is assigned to the common reference point P1 before and after the change of the posture of the probe 45, as in the case where the probe 45 is replaced in the first embodiment. Accordingly, the position data is measured and stored in the memory 61. Thus, the external measurement position data measured by the probe 45 having the same posture are actually measured by the probe device difference correcting unit 71 described in the first embodiment, and actually measured by the probe 45 having the same posture. Can be aligned with position data.

  When the workpiece W is moved by the workpiece jig 19V, the position data is measured by bringing the tip of the probe 45 into contact with the three reference points set in advance on the workpiece W or a portion that moves together with the workpiece W. I do. These three reference points are set so as not to be aligned. Then, position correction is performed by a work movement correction unit 74 (see FIG. 10) configured when the data analysis program is executed on the personal computer 69. That is, for example, when the workpiece W is changed to the first position, the second position, and the third position, the first point connecting the reference points P1, P2, and P3 measured at the first position. A second triangle connecting the triangle and the reference points P1, P2, and P3 measured at the second position and a third triangle connecting the reference points P1, P2, and P3 measured at the third position are obtained. Then, a second conversion formula for superimposing the second triangle on the first triangle is obtained, and a third conversion formula for superposing the third triangle on the first triangle is obtained. Then, all of the position data measured at the second position is converted by the second conversion formula, and all of the position data measured at the third position is converted by the third conversion formula. Thereby, in practice, the external measurement position data measured by changing the position of the workpiece W can be aligned with the external measurement position data measured by fixing the workpiece W at the same position.

[Third Embodiment]
This embodiment is a modification of the second embodiment, and the processing when the posture of the probe 45 is changed is different. That is, in the present embodiment, when the posture of the probe 45 is changed, the plurality of reference points 19P on the flat reference surface 19M set in advance and the plurality of reference holes 19H set in advance are provided with each probe 45. The position data is measured at the tip. Specifically, as shown in FIG. 11, the upper surface on the support table 19W described in the second embodiment is set as a reference surface 19M, and a plurality of reference points P1 are set on the reference surface 19M. Then, before and after the posture change of the probe 45, the tip of the probe 45 is brought into contact with a plurality of reference points P1, and the position data in the vertical direction (Z direction) of the target 49 before and after the posture change of the probe 45 is different. Are detected and the average of them is obtained. A plurality of holes formed on the support table 19W are set as a plurality of reference holes 19H. Then, before and after the posture change of the probe 45, the tip portion of the probe 45 is brought into contact with the plurality of reference holes 19H, and the position data in the front-rear direction (X direction) of the target 49 before and after the posture change of the probe 45 is different. And a difference in position data in the horizontal direction (Y direction) of the target 49 is detected, and an average of them is obtained. The correction vector for the second probe described in the first embodiment is obtained from the position data in the vertical direction, the front-rear direction, and the horizontal direction thus obtained. By adopting such a configuration, the accuracy of the correction vector is improved.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

(1) In the first embodiment, the position data of all the measurement points set on the workpiece W are measured using the processing machine main body 11 and the laser tracker 50. Position data of some measurement points is measured by the processing machine main body 11 and the laser tracker 50, and for the remaining measurement points, for example, the operator manually places the target 49 on the measurement points of the workpiece W. Alternatively, Leica T-Probe may be used as a probe, and the tip of the probe may be manually brought into contact with the measurement point of the workpiece W, and the position data of the measurement point may be measured by the laser tracker 50. .

(2) In the first embodiment, the position data is measured by the “twice application process” in which the tip of the probe 45 is applied twice to the reference point and all measurement points. However, the reference point and all measurement points are measured. Alternatively, the position data may be measured by a process in which the tip of the probe 45 is applied once.

(3) In the first embodiment, the target 49 is attached to each of the first to third probes 45A, 45B, 45C. However, when the probe 45 is moved by the processing machine main body 11, The target 49 may be attached to a part other than the probe 45 as long as the relative position is kept constant. Specifically, for example, the target 49 may be attached to the front surface of the third movable base 14 in the processing machine body 11.

(4) In the first embodiment, the reference point P1 is set to the workpiece W. However, if the point does not change before and after the probe 45 is replaced, the reference point P1 is disposed at a position other than the workpiece W. May be.

10, 10V processing device 11, 11V processing machine main body 30 controller 31 main control unit 32 memory 33 CPU (trigger signal output unit, first reference data acquisition means)
40 processing tool 45 probe 49 target 50 laser tracker 60 CPU (position data storage means)
61 Memory (Position data storage means)
PG1 NC program for machining PG2 NC program for measurement W Workpiece

In order to achieve the above object, according to the first aspect of the present invention, after machining a workpiece with a machining tool by an NC program, a probe is attached instead of the machining tool, and the tip of the probe is attached to the tip of the workpiece. In an NC processing apparatus that sequentially contacts a plurality of measurement points and measures the position data of each measurement point, the target attached to the movable part of the NC processing apparatus together with the probe, and the position data of the target are measured. A laser tracker, a trigger signal output unit that outputs a trigger signal based on a contact detection signal output from the probe each time the tip of the probe contacts each measurement point, and the trigger signal is output Each time, the position data of the target measured by the laser tracker A position data storage means for storing as a substitute data position data, the NC program, the measurement point, tip twice against process to twice abut on the work of the probe is provided, the 2 The contact process includes a first contact process in which the tip of the probe is pressed against the work and then separated, and the probe control position data is acquired when the contact detection signal changes during the separation. A second abutting process for moving the tip of the probe to a position just abutting against the workpiece based on the control position data, and the trigger signal output unit includes the probe in the second abutting process. It is an NC processing device that outputs a trigger signal based on the contact detection signal output from the machine.
Here, “moving the tip of the probe to a position just in contact with the workpiece” means “moving the tip of the probe to a position that does not deviate as much as possible from the position at the moment of contact with the workpiece”. .

The invention according to claim 4, any one of claims 1 to 3 error calculation means for calculating an error between the dimensions of the design and dimensions of the workpiece based on the position data of the target is provided It is NC processing apparatus as described in.

In the fifth aspect of the present invention, after a workpiece is machined by a machining tool of an NC machining apparatus, a target is attached together with a probe to a movable part of the NC machining apparatus instead of the machining tool, and position data of the target is obtained by a laser tracker. The probe is brought into a measurable state, and the tip of the probe is sequentially brought into contact with a plurality of measurement points of the workpiece. At that time, the position data of the target is detected by the laser tracker based on the contact detection signal output from the probe. was measured, based on the position data of the target, it said workpiece manufacturing method der the workpiece to produce the workpiece to determine whether or not it is working part geometry as designed, each At the measurement point, the tip of the probe is brought into contact with the workpiece twice, and the contact detection signal is generated at the time of separation after the first contact. The position data for control of the probe at the time of the change is acquired, the probe is moved toward the work based on the position data for control, and the second contact is performed. It is a manufacturing method of the processed component which measures the position data of the target with the laser tracker based on the contact detection signal output from the probe.

In the NC machining apparatus and the machining part manufacturing method of the present invention, the target is attached to the movable part of the NC machining apparatus together with the probe, and the position data of the target is measured by the laser tracker as substitute data for the position data of each measurement point of the workpiece. Is done. That is, according to the present invention, the position data of each measurement point of the workpiece is measured by a laser tracker that is different from the position sensor used when processing the workpiece. Measurement can be performed. Compared to the case where an operator manually places targets at all measurement points set on a workpiece and measures position data with a laser tracker, accurate measurement of position data takes less time. It can be performed. In addition, since the position data is measured by the application process twice, the contact state of the probe with the workpiece is stable, and stable position data can be measured. Furthermore, after the workpiece is machined by the NC machining device, position data can be measured while the workpiece is fixed to the jig, so additional machining is possible when the workpiece has not been machined correctly. Can be done quickly and easily. In that case, as in the invention of claim 4 , if an error calculating means for calculating an error between the workpiece dimension based on the target position data and the designed dimension is provided, it is quickly determined whether or not the additional machining is performed. Can be judged.

FIG. 6 shows an example of a measurement NC program PG2 for measuring the position data of these measurement points. For example, when the CPU 33 executes the measurement NC program PG2, the tool data of the first to third probes 45A to 45C used in the measurement NC program PG2 is read from the data table (S20). Then, in the following processing, the tip of one of the probe 45 of the first to third probe 45 a to 45 c, a "twice against process" which abut over twice to each measurement point of the work W Then, a trigger signal is output to the laser tracker 50.

Claims (6)

After machining a workpiece with a machining tool according to the NC program, a probe is attached instead of the machining tool, and the tip of the probe is sequentially brought into contact with a plurality of measurement points of the workpiece, and each of the measurement points is measured. In NC processing equipment that measures position data,
A target attached to the movable part of the NC processing apparatus together with the probe;
A laser tracker for measuring the position data of the target;
A trigger signal output unit that outputs a trigger signal based on a contact detection signal output from the probe every time the tip of the probe contacts each measurement point;
An NC machining apparatus comprising position data storage means for storing position data of the target measured by the laser tracker as substitute data for position data of the measurement point each time the trigger signal is output.   In the NC program, after the start of measurement of the position data of the target, when a change accompanied by a change of a three-dimensional vector from the tip of the probe to the target is performed, before and after the change, The NC processing apparatus according to claim 1, further comprising first reference data acquisition means for measuring position data of the target with respect to a measurement point and storing the data in the position data storage means.   In the NC program, when the workpiece is moved after the measurement of the position data of the target is started, the position data of the target with respect to three common measurement points on the workpiece is measured before and after the movement. The NC processing apparatus according to claim 1, further comprising second reference data acquisition means for storing in the position data storage means. The NC program includes a two-time contact process in which the tip of the probe is brought into contact with the workpiece twice at the measurement point,
In the two-step contact process, the tip of the probe is pressed against the workpiece and then separated, and the first contact for obtaining the control position data for the probe when the contact detection signal changes during the separation. And a second abutting process for moving the tip of the probe to a position just abutting against the workpiece based on the control position data,
4. The NC machining apparatus according to claim 1, wherein the trigger signal output unit outputs a trigger signal based on a contact detection signal output from the probe in the second contact processing. 5. .   5. The NC machining apparatus according to claim 1, further comprising an error calculation unit configured to calculate an error between a dimension of the workpiece based on the position data of the target and a design dimension. After machining the workpiece with the machining tool of the NC machining apparatus, a target is attached together with the probe to the movable part of the NC machining apparatus instead of the machining tool so that the position data of the target can be measured by the laser tracker.
The tip of the probe is sequentially brought into contact with a plurality of measurement points of the workpiece, and at that time, the position data of the target is measured by the laser tracker based on a contact detection signal output from the probe,
A method for manufacturing a machined part, wherein the machined part is produced by determining whether or not the workpiece is a machined part having a shape as designed based on position data of the target.

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