JP5312429B2 - Rotating tool machining method and wire electric discharge machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately adjust the dimension of the outermost diameter of a rotary tool to a set value. <P>SOLUTION: The rotary tool 10 formed by providing a blade part 14 in a tool raw material is dividably fitted to a rotary dividing device 20 around the rotation axis L0 extending in the horizontal direction, and a wire electrode 9 is moved along machining points P in the top surface of the blade part 14 to machine the blade part 14 with the energy discharged from the wire electrode 9. This machining method of the rotary tool using the wire electric discharge machine includes: a measuring step of measuring the top surface position of the blade part 14 of the rotary tool 10 fitted to the rotary dividing device 20; a dividing position lead-out step of leading out the target dividing position so that the machining points P of the top surface of the blade part 14 and the rotary axis L0 become the same height based on the measurement result in the measuring step; and a machining step of dividing the rotary tool 10 to the target dividing position led out in the dividing position lead-out step and for moving the wire electrode 9 along the machining points P of the top surface of the blade part 14 of the rotary tool 10 to machine the blade part 14. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a rotary tool machining method using a wire electric discharge machine and a wire electric discharge machine.

  Conventionally, a rotary tool such as an end mill is attached to a rotary indexing device, and while the rotary tool is indexed and positioned, the wire is moved relative to the rotary tool in the radial direction and the axial direction and protruded from the outer peripheral surface of the rotary tool. 2. Description of the Related Art A wire electric discharge machine that processes the tip of a cutting blade is known (see, for example, Patent Document 1). In the wire electric discharge machine described in Patent Document 1, a PCD chip is attached to the kerf on the outer peripheral surface of the rotary tool, the attachment error is measured, and the angle of the wire and the rotation angle of the rotary tool are set based on the measured values. Then, the rotation angle of the rotary tool and the movement amount of the wire in the axial direction are controlled while maintaining the set wire angle. Specifically, the rotary tool is processed by moving the wire inward in the radial direction by a correction amount from the outer diameter portion of the rotary tool while holding the wire in a vertical state.

JP 2003-117733 A

  By the way, for a rotary tool such as an end mill, when machining a workpiece with high accuracy, the dimension from the rotation center of the rotary tool to the tip of the cutting edge, that is, the dimension of the outermost diameter of the rotary tool is precisely matched to the design value. This is very important. However, in the electric discharge machine described in Patent Document 1, the rotary tool is processed by moving the wire radially inward from the outer diameter portion of the rotary tool by a correction amount while rotating the rotary tool. It is difficult to adjust the outermost diameter dimension of this to the design value with high accuracy.

The present invention attaches a rotary tool provided with a blade portion to a tool material so that it can be indexed to a rotary indexing device around a rotation axis extending in the horizontal direction, and a wire is formed along a processing point on the upper surface of the blade portion. A rotary tool machining method using a wire electric discharge machine, in which a rotary tool and a wire electrode are moved relative to each other so that the electrode moves, and a blade portion is machined by discharge energy from the wire electrode. Based on the measurement process for measuring the upper surface position of the blade part of the attached rotary tool and the measurement result in the measurement process, a target index position is derived so that the machining point on the upper surface of the blade part is at the same height as the rotation axis. The rotary tool is indexed to the index position deriving step and the target index position derived in the index position deriving step, and the wire electrode is moved along the machining point on the upper surface of the rotary tool blade to machine the blade. Processing process to Characterized in that it contains.
Further, the present invention relates to a rotary indexing device that can detachably grip a rotary tool provided with a blade portion on a tool material and can index around a rotation axis extending in the horizontal direction, and a rotary indexing device. A wire electrode that is close to the blade portion of the attached rotary tool and processes the blade portion by discharge energy, a moving means that moves the wire electrode relative to the workpiece, and a control means that controls the rotary indexing device and the moving means And a measuring means for measuring the upper surface position of the blade part of the rotary tool attached to the rotary indexing device, the control means based on the measurement result by the measuring means, The rotary indexing device and the moving means are arranged so that the rotary tool is indexed so that the machining point on the upper surface of the blade is at the same height as the rotation axis, and the wire electrode moves along the machining point on the upper surface of the blade after indexing. To control The features.

  According to the present invention, the rotary tool is indexed so that the machining point on the blade upper surface of the rotary tool is at the same height as the rotation axis of the rotary indexing device, and the wire electrode is moved along the machining point on the blade upper surface. Since it did in this way, a blade part can be processed on the same plane as a rotating axis, and the dimensional accuracy of the outermost diameter of a rotary tool can be improved.

The front view of the wire electric discharge machine which concerns on embodiment of this invention. The perspective view which shows an example of a workpiece | work. The figure which shows an example of processing operation by the wire electric discharge machine of FIG. The figure explaining the effect of this invention. The block diagram which shows the structure of the measurement control part of FIG. The figure which shows an example of the measurement operation | movement by the wire electric discharge machine of FIG. The figure explaining the processing point position of a cutting blade upper surface, and a measurement point position. FIG. 8 is a diagram for explaining measurement point positions in a measurement mode (one point measurement, two point measurement) different from FIG. 7. The flowchart which shows an example of the process performed by the measurement sequence process part of FIG. 6 is a flowchart showing an example of the three-point measurement process of FIG. 6 is a flowchart showing an example of the four-point measurement process in FIG. The figure explaining the measurement point position in the measurement mode (all point measurement) different from FIG. The block diagram which shows the structure of the process control part of FIG. The figure which shows the modification of FIG.

  Hereinafter, embodiments of a wire electric discharge machine according to the present invention will be described with reference to FIGS. FIG. 1 is a front view of a wire electric discharge machine according to an embodiment of the present invention, and FIG. 2 is a perspective view showing an example of a workpiece W processed by the wire electric discharge machine. In FIG. 1, the left and right directions and the up and down directions are defined as shown, and the front side and the back side in the direction perpendicular to the paper surface are defined as the front side and the rear side (front and rear direction), respectively. The left-right direction, the front-rear direction, and the up-down direction are parallel to the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively.

  In the present embodiment, as shown in FIG. 2, a rod-shaped rotary tool 10 such as an end mill or a reamer is used as the workpiece W. The tool 10 includes a substantially cylindrical shank portion 11 and a tool portion 12 on the proximal end side and the distal end side along the tool axis L1 direction which is the tool rotation center. A cut groove 13 is formed in the tool portion 12 along the direction of the tool axis L1, and a thin plate-like cutting blade 14 such as a PCD chip is attached to the processed surface of the cut groove 13 by brazing or the like. The end portion of the cutting blade 14 protrudes outward in the axial direction from the tip surface of the tool portion 12 and protrudes radially outward from the outer peripheral surface of the tool portion 12. That is, the cutting edge 14 defines the outermost diameter of the tool 10.

  In the figure, the cutting blade 14 is provided at one place in the circumferential direction (single blade), but a plurality of cutting blades 14 may be provided symmetrically in the circumferential direction. For example, rotating with a plurality of cutting blades 14 such as two (two blades) every 180 degrees, three (three blades) every 120 degrees, four (four blades) every 90 degrees, etc. A tool 10 can be formed. Further, a plurality of cutting blades 14 can be provided apart from each other in the axial direction as a tapered stepped shape with the tool portion 12 extending to the tip (see FIG. 7).

  As shown in FIG. 1, a work mounting base 2 is supported on the upper portion of the bed 1. The work mounting base 2 has a pair of left and right side wall portions 2b extending upward from the base portion 2a, and the rotary indexing device 20 is mounted on the upper surface of one side wall portion 2b. The rotary indexing device 20 is provided with a chuck 21 that holds a workpiece W along a horizontal axis L0 parallel to the X axis, and the chuck 21 has a rotational axis L1 that coincides with the axis L0. In this state, the shank portion 11 of the tool 10 is attached. The chuck 21 is driven to rotate about the axis L0 by a servo motor in the rotary indexing device, for example, and thereby the tool 10 can be indexed and positioned around the horizontal axis parallel to the X axis (hereinafter referred to as the C axis). .

  A processing tank 3 is provided on the bed 1 so as to surround the workpiece mounting base 2 and the rotary indexing device 20, and a processing liquid tank 4 is accommodated in the bed 1 below the processing tank 3. Water or oil is used as the processing liquid. A column 5 is erected on the rear side of the work mounting base 2, and a Y-axis slider 6 is supported on the top of the column 5 through a linear feed mechanism so as to be slidable in the front-rear direction. An X-axis slider 7 is supported on the Y-axis slider 6 so as to be slidable in the left-right direction via a linear feed mechanism. On the X-axis slider 7, a V-axis slider 22 that is movable in the V-axis direction parallel to the Y-axis is supported via a linear feed mechanism. A U-axis slider 23 that is movable in the U-axis direction parallel to the X-axis is supported on the front surface of the V-axis slider 22 via a linear feed mechanism. A quill 8 is supported on the front surface of the U-axis slider 23 by a linear feed mechanism so as to be movable up and down. The linear feed mechanism includes, for example, a ball screw and a servo motor that rotationally drives the ball screw.

  The upper head 15 is attached to the lower end of the quill 8, and the lower head 16 is disposed below the upper head 15, that is, in the concave space 17 inside the pair of left and right side walls 2b. A wire electrode 9 is supported on the upper head 15 and the lower head 16 in the vertical direction. The wire electrode 9 is fed between the heads 15 and 16 by a feeding means (not shown).

  A support arm 18 is integrally attached to the X-axis slider 7. The support arm 18 extends from the rear of the work mounting base 2 into the recessed space 17, and the lower head 16 is supported by the front end portion of the support arm 18 and is integrally connected to the upper head 15 via the support arm 18. ing. As a result, the upper head 15 and the lower head 16 can move integrally in the front-rear and left-right directions, and the wire electrode 9 moves relative to the workpiece W in the X-axis and Y-axis directions orthogonal to the workpiece W while maintaining the vertical posture. To do. Further, the upper head 15 can be moved relative to the lower head 16 in the front-rear and left-right directions by the U-axis slider 23 and the V-axis slider 22, and the wire electrode 9 can be inclined at a desired angle with respect to the vertical line.

  At the time of machining the workpiece, the machining fluid is supplied from the machining fluid tank 4 into the machining tank 3 via a pump (not shown), and the wire electrode 9 is disposed at a minute interval from the workpiece W. During this period, a pulse voltage is applied from the machining power source. As a result, a discharge is generated between the workpiece W and the wire electrode 9, and the workpiece W is processed. At this time, while the work W is indexed around the C axis by the rotary indexing device 20, the wire electrode 9 is moved to a desired inclination angle by driving the X-axis slider 7, the Y-axis slider 6, the U-axis slider 23, and the V-axis slider 22. Then, the workpiece W is moved along the machining point of the workpiece W to machine the workpiece W. That is, in the wire electric discharge machine according to the present embodiment, the rotary tool 10 is machined by 5-axis machining of XYUVC axes.

  The operation of the wire electric discharge machine, that is, the driving of the servo motors for the X axis, Y axis, U axis and V axis, the servo motor for C axis, and the like is controlled by the control device 30. The control device 30 includes an arithmetic processing device having a CPU, ROM, RAM, and other peripheral circuits, and includes a measurement control unit 31 and a processing control unit 32. The measurement control unit 31 automatically measures the position of the upper surface of the cutting blade 14 of the rotary tool 10 as described later, and acquires data (machining rotation angle) necessary for workpiece machining based on the measured value. The machining control unit 32 creates a machining program based on the acquired data, and controls the servo motor according to the machining program.

  FIG. 3 is a diagram illustrating an example of a machining operation when machining the outer diameter portion of the cutting blade 14 while moving the wire electrode 9 in the direction of the rotation axis of the workpiece W. The tool 10 is shown in front view. In the drawing, the solid line 14a corresponds to the side end face (see FIG. 2) on the outer diameter side of the cutting edge 14 processed by the wire electrode 9, and the cutting edge 14 is attached obliquely with respect to the axis L0. Yes. 3A to 3D correspond to before processing, at the start of processing, at the middle, and at the end of processing, respectively.

  As shown to Fig.3 (a), before the process start, the workpiece | work W is set to the reference position which is a reference | standard of indexing positioning. At the reference position, the absolute angle θ around the C axis is 0 degree, and the upper surface of the cutting blade 14 is located below the axis L0 over the entire area. As shown in FIG. 3B, at the start of machining, the workpiece W is indexed so that the machining point P1 at one end in the axial direction of the cutting blade 14 is positioned on the axis L0, and the machining point P1 is machined by the wire electrode 9. Is done. As shown in FIG. 3C, at the intermediate time, the workpiece W is indexed so that the machining point P2 of the intermediate portion in the axial direction of the cutting blade 14 is located on the axis L0, and the machining point P2 is machined by the wire electrode 9. The As shown in FIG. 3D, at the end of machining, the workpiece W is indexed so that the machining point P3 at the other axial end of the cutting edge 14 is positioned on the axis L0, and the machining point P3 is determined by the wire electrode 9. Processed. As described above, at the time of workpiece machining, the rotary indexing device 20 is rotated around the C axis according to the machining point position so that the machining points P1 to P3 are at the same height as the axis L0, and the workpiece W is continuously moved. Will be determined.

  As a result, when the line segment connecting the axis L0 and the processing point P is L2 and the horizontal line orthogonal to the axis L0 is L3 as shown in FIG. 4A, the angle Δθ formed by L2 and L3 is 0 degree. The workpiece W is always machined at the same height as the axis L0. For this reason, as in the case of processing a planar workpiece, the workpiece W can be set to a desired outermost diameter simply by setting the position of the wire electrode 9 from the axis L0 (reference position). The dimension of the outermost diameter can be adjusted to the design value easily and accurately. On the other hand, when the workpiece W is machined at a height other than the same height as the axis L0 (Δθ ≠ 0) as shown in FIG. 4B, after measuring the inclination angle of the cutting edge 14 with respect to the axis L0, It is necessary to calculate the machining point position corresponding to the outermost diameter at the rotation angle Δθ using a trigonometric function or the like. For this reason, a calculation error occurs, and it is difficult to accurately match the outermost diameter dimension to the design value.

  The machining control unit 32 creates a machining program including an indexing command for the workpiece W so that the machining point position is at the same height as the axis L0. As a precondition, the measurement control unit 31 executes the following processing. Is done. FIG. 5 is a block diagram illustrating a configuration of the measurement control unit 31. The measurement control unit 31 is centered on the measurement sequence processing unit 310, the machining program setting unit 311, the program interpretation unit 312, the interpolation processing unit 313, the servo control unit 314, the data input unit 315, and the data storage unit 316. And have. The measurement controller 31 receives a signal from the input device 33 and inputs / outputs a signal from the measurement probe 34. The measurement control unit 31 outputs control signals to the servo motors 35a to 35c for the X axis, the Y axis, and the C axis.

  The input device 33 is configured by an input monitor such as a touch panel operated by a user, for example, and a signal from the input device 33 is input to the measurement sequence processing unit 310 via the data input unit 315. The input information in this case includes various information related to the measurement of the upper surface position of the cutting blade 14, such as the number N of blades in the circumferential direction of the rotary tool 10, the measurement program PG, the measurement start angle θa, and the measurement start command. The measurement program PG is selected according to the number of measurement points on the upper surface of the cutting edge by the measurement probe 34. In the present embodiment, one of the four measurement programs PG1 to PG4 is measured: measuring one point on the upper surface of the cutting edge, measuring two points, measuring three points, and measuring the same point as the machining point P (all point measurement). One is selected. The XY coordinates of the measurement points used in the one-point measurement, the two-point measurement, and the three-point measurement are selected automatically or stored in the memory in advance in association with the measurement programs PG1 to PG3.

  As shown in FIG. 6, the measurement probe 34 is attached to the tip of a support arm 37 extending from the base body 36, and the base body 36 is attached to the side surface of the upper head 15. At the time of measuring the upper surface position of the cutting blade 14, the wire probe 9 is removed from the upper head 15, and then the measurement probe 34 is arranged coaxially with the wire electrode 9 and so that the probe tip is at the same height as the axis L0. The By providing the measurement probe 34 integrally with the upper head 15, the measurement probe is driven by the servo motors 35a and 35b while keeping the tip of the probe at the same height as the axis L0 (while keeping the position in the Z-axis direction constant). 34 can be moved to an arbitrary measurement point position on the XY plane.

  FIG. 6 shows the cutting edge 14 with a dotted line when the workpiece W is at the reference position. At the reference position, the upper surface of the cutting edge is positioned below the axis L0, and the upper surface of the cutting edge is separated from the measurement probe 34. In this state, after the measurement probe 34 is moved to the measurement point position, when the workpiece W is rotated in the A direction (forward rotation), the upper surface of the cutting edge 14 comes into contact with the measurement probe 34 as indicated by a solid line. Further, when the workpiece W at the contact position is rotated in the B direction (reverse rotation), the cutting blade 14 is separated from the measurement probe 34. The measurement probe 34 outputs an on signal when the cutting blade 14 abuts, and outputs an off signal when separated.

  In the machining program setting unit 311 of FIG. 5, a machining program including machining point data at the machining point P of the workpiece W is set in advance via a CAD / CAM system or the like. FIG. 7A is a diagram illustrating an example of a processing point P set on the upper surface of the cutting edge 14. In FIG. 7A, two cutting blades 14A and 14B are attached to be separated in the axial direction. The processing points P1 to P7 are points indicating the processing position of the upper surface of the cutting edge by the wire electrode 9, and the processing program includes a predetermined position P0 (for example, the end surface of the chuck 21) on the axis L0 as the origin (X = Y = Z). = 0), the XY coordinates of the processing points P1 to P7 are set in a block format. Outline lines PA1 and PA2 obtained by sequentially connecting the processing points P1 to P3 and P4 to P7 which are block end points correspond to the outer shape of the cutting edge 14.

  In the machining program, for example, block end points are set in a range other than the cutting edge 14 such as Pa to Pf (non-machining points). A bending straight line obtained by sequentially connecting the block end points Pa, Pb, P1 to P3, Pc to Pe, P5 to P7, and Pf becomes a moving path PA0 of the wire electrode 9. In this case, the center position of the wire electrode 9 and the actual processing position differ by an amount corresponding to the wire diameter. Therefore, the amount of deviation between the actual machining position and the center position of the wire electrode 9 is set in advance as a diameter correction amount, and the position of the wire electrode 9 is corrected by this diameter correction amount at the time of workpiece machining, and the machining position is set to the machining point. Align with the position of P accurately.

  The correction of the wire electrode position is performed when the wire electrode 9 is at the position (processing position) where the cutting blade 14 is to be processed (diameter correction on), and is not performed when the wire electrode 9 is in the non-processing position (diameter correction off). In the example of FIG. 7A, the diameter correction is turned on at the block end points Pb, Pe immediately before the first processing points P1, P5 on the cutting edge 14, and the block end point Pc, next to the final processing points P3, P7. The diameter correction is turned off at Pf. These block end points Pb, Pc, Pe, and Pf are set in the machining program as command points that output not only coordinate values but also diameter correction on command and off command. In the present embodiment, the radius correction on range refers to a range excluding block end points for commanding radius correction on / off, that is, ranges of processing points P1 to P3 and P4 to P7. When machining with the wire electrode 9 inclined with respect to the vertical line, the machining program includes not only the XY coordinate data (X-axis and Y-axis data) of the machining point P, but also the inclination angle of the wire electrode 9 or the upper head. A deviation amount between the lower head 16 and the lower head 16 (U-axis and V-axis data) is also set.

  The program interpretation unit 312 reads and interprets the machining program and outputs it to the measurement sequence processing unit 310. The measurement sequence processing unit 310 executes processing (to be described later) (FIGS. 9 to 11) based on signals from the data input unit 315, the program interpretation unit 312 and the interpolation processing unit 313, and creates a measurement program. . Then, based on the measurement program, a control signal is output to the program interpreter 312 so that the measurement position of the upper surface of the cutting edge is measured by the measurement probe 34, and a new machining program is created based on the measurement result by the measurement probe 34. The data (processing rotation angle) necessary for creating the data is stored in the data storage unit 316.

  FIG. 7B is a diagram illustrating an example of a measurement position on the upper surface of the cutting edge by the measurement probe 34, particularly a measurement position when three-point measurement (measurement program PG3) is selected. In the figure, Q1 to Q3 are measurement points on the cutting edge 14A, Q4 to Q6 are measurement points on the cutting edge 14B, and the positions (XY coordinates) of these measurement points Q1 to Q6 are block end points on the measurement program. Are set in advance by the user via the input device 33 and stored in the memory. The points Qa to Qf in the figure are equal to the block end points Pa to Pf (FIG. 7A) set in the machining program, and these block end points Qa, Qb, Q1 to Q3, Qc to Qe, Q4 to A bent straight line connecting Q6 and Qf sequentially becomes a moving path PA3 of the measurement probe 34.

  In this case, the measurement points Q1 to Q3 on the cutting edge 14A and the measurement points Q4 to Q6 on the cutting edge 14B are set to points that are not on one straight line. Therefore, by measuring the positions of the three points Q1 to Q3 and Q4 to Q6 on the upper surface of the cutting edge with the measurement probe 34, the plane formula of the upper surface of the cutting edges 14A and 14B can be calculated. In the present embodiment, by using a plane formula on the upper surface of the cutting edge, as shown in FIG. 3, the index position (machining) of the workpiece W for making the machining points P1 to P3 and P4 to P7 have the same height as the axis L0. Rotation angle).

  When one-point measurement (measurement program PG1) is selected, one measurement point Q1 is set on the cutting blade 14 as shown in FIG. 8A, and the position of the measurement point Q1 is the measurement probe. 34 is measured. In this case, it is assumed that the upper surface of the cutting edge is on a plane passing through the axis L0, the plane formula of the upper surface of the cutting edge is calculated from the measurement point Q1 and the axis L0, and the workpiece W is machined at each machining point using the plane formula. Find the rotation angle.

  When two-point measurement (measurement program PG2) is selected, two measurement points Q1 and Q2 are set on the cutting edge 14 as shown in FIG. 8B, and the positions of the measurement points Q1 and Q2 are set. Is measured by the measurement probe 34. In this case, a virtual line L2 perpendicular to both the straight line L1 passing through Q1 and Q2 and the axis L0 is calculated, and the cutting blade upper surface is on a plane that intersects the virtual line L2 perpendicularly and includes the straight line L1. Assuming that, the plane equation is calculated, and the machining rotation angle of the workpiece W at each machining point is obtained using the plane equation. In addition, when the straight line L1 and the straight line L0 cross or are parallel, it is assumed that the cutting blade upper surface is on a plane including both the straight line L1 and the straight line L0.

  On the other hand, when all-point measurement (measurement program PG4) is selected, the machining points P1 to P3 and P4 to P7 in FIG. 7A are set as measurement points as they are, and the machining points P1 to P3 and P4 are set as they are. The position of ~ P7 is measured by the measurement probe 34. For this reason, the processing rotation angle of the workpiece | work W in each processing point P1-P3, P4-P7 can be calculated | required as it is from a measured value, without calculating the plane type of a cutting-blade upper surface.

  The interpolation processing unit 313 calculates the target movement amount of each axis for moving the measurement probe 34 to the measurement position. Further, a target rotation angle around the C axis of the workpiece W is calculated based on an on / off signal from the measurement probe 34. For example, when an ON signal is output from the measurement probe 34, that is, when the tip of the measurement probe 34 comes into contact with the upper surface of the cutting blade, the workpiece W rotates to a predetermined measurement start angle θa in the direction B of FIG. The target rotation angle is calculated as follows. The measurement start angle θa is set to an angle at which the entire cutting blade is sufficiently separated from the probe 34, that is, an initial position angle (θa = 0), for example, as indicated by a dotted line in FIG. On the other hand, when an OFF signal is output from the measurement probe 34 and a workpiece normal rotation command to be described later is output from the measurement sequence processing unit 310, the workpiece W rotates in the A direction until the upper surface of the cutting edge comes into contact with the probe 34. The target rotation angle is calculated as follows.

  The servo control unit 314 controls the X-axis and Y-axis servomotors 35a and 35b so that the movement amount of the measurement probe 34 becomes the target movement amount calculated by the interpolation processing unit 313. Furthermore, the servo motor 35c of the rotation index device 20 is controlled so that the rotation angle of the workpiece W becomes the calculated target rotation angle.

  Here, the measurement process in the measurement sequence processing unit 310 will be described. FIG. 9 is a flowchart illustrating an example of measurement processing executed by the measurement sequence processing unit 310. The processing shown in this flowchart is started when a measurement start command is input through the input device 33 after the measurement probe 34 is arranged coaxially with the wire electrode 9, for example. Before starting the measurement process, the measurement probe 34 is set at an initial position (for example, Qa in FIG. 7B) separated from the workpiece W, and the workpiece W is set at an angle (θa = 0) of the initial position. Yes.

  In step S1, a power-on signal is output to the measurement probe 34. As a result, the measurement probe 34 can output an ON signal. In step S <b> 2, a signal from the input device 33 is read via the data input unit 315, and a signal (machining program information) from the machining program setting unit 311 is read via the program interpretation unit 312.

  In step S3, based on the signal from the data input unit 315, it is determined whether one-point measurement, two-point measurement, three-point measurement, or all-point measurement is selected as the measurement program PG. If it is determined in step S3 that one-point measurement is selected, the process proceeds to step S100. If two-point measurement is determined to be selected, the process proceeds to step S200. If three-point measurement is determined to be selected, the process proceeds to step S300. If it is determined that the point measurement is selected, the process proceeds to step S400.

  If automatic selection is selected, one of one point measurement, two point measurement, three point measurement, or all point measurement is selected depending on how many measurement points are within the radius correction ON range. . Specifically, if there is one measurement point from the radius correction ON command to the radius correction OFF command, one point measurement, two points measurement, three points measurement, three points measurement, four points or more all points Automatically select measurement.

  FIG. 10 is a flowchart illustrating an example of the three-point measurement process in step S300. In step S301, the machining program set by the machining program setting unit 311 is read and a measurement program PR3 for three-point measurement is created. In this case, instead of the machining points P1 to P3 and P4 to P7 in FIG. 7A, measurement points Q1 to Q3 and Q4 to Q6 in FIG. Keep it. In the following description, the diameter correction is not performed regardless of the output of the diameter correction ON signal so that the block end point becomes the target position of the measurement probe 34.

  As a result, the movement path PA3 of the bent linear measurement probe 34 along the Qa, Qb, Q1 to Q3, Qc to Qe, Q4 to Q6, and Qf is set in the measurement program PR3 as shown in FIG. 7B. Is done. Note that commands other than the movement of the upper head 15 set in the machining program (for example, a machining power on / off command) are canceled in the measurement program PR3. The diameter correction on / off command itself set in the machining program is left as it is in the measurement program.

  In step S302, control signals are output to the X-axis and Y-axis servomotors 35a and 35b via the program interpretation unit 312, and the measurement probe 34 is sequentially moved to the block end position based on the measurement program PR3. In step S303, based on the diameter correction ON / OFF command output for each block end point, whether or not the measurement probe 34 is within the range in which the diameter correction ON command is output, that is, Q1 to Q3 in FIG. It is determined whether or not the measurement probe 34 is located in any of Q4 to Q6.

  If step S303 is affirmed, the process proceeds to step S304. If negative, the process returns to step S302. In step S <b> 304, a workpiece normal rotation command is output to the interpolation processing unit 313 via the program interpretation unit 312. Accordingly, the interpolation processing unit 313 calculates a target rotation angle such that the workpiece W rotates at a predetermined speed in the A direction of FIG. 6 and controls the servo motor 35c for the C axis via the servo control unit 314. As a result, the upper surface of the cutting edge of the tool 10 approaches the measurement probe 34.

  When the upper surface of the cutting edge comes into contact with the measurement probe 34, an ON signal is output from the measurement probe 34 to the interpolation processing unit 313. Thereby, the interpolation processing unit 313 sets the target rotation angle to 0 and stops the drive of the servo motor 35c for the C axis, and causes the measurement sequence processing unit 310 to rotate the current rotation angle of the workpiece W, that is, the reference position (θ = 0). To the rotation angle θq until the upper surface of the cutting edge comes into contact with the probe 34 is output. Thereafter, the interpolation processing unit 313 controls the servo motor 35c via the servo control unit 314 with the target rotation angle as the measurement start angle θa. Thereby, the workpiece W rotates in the B direction, the upper surface of the cutting edge is separated from the measurement probe 34, and the workpiece W is stopped at the measurement start angle θa.

  In step S305, it is determined whether or not the rotation angle θq is input from the interpolation processing unit 313 to the measurement sequence processing unit 310. When step S305 is affirmed, the process proceeds to step S306, and when negative, the process returns to step S304. In step S306, the rotation angle θq is stored in the memory. In step S307, it is determined whether or not the measurement of the rotation angles θq1 to θq6 at all measurement points Q1 to Q6 on the upper surface of the cutting edge has been completed. If step S307 is negative, the process returns to step S302, the measurement probe 34 is moved to the next measurement point, and the same processing is repeated. Accordingly, the rotation angles θq1 to θq6 of the workpiece W when the upper surface of the cutting edge comes into contact with the probe 34 can be acquired at all the measurement points Q1 to Q6.

  If step S307 is affirmed, the process proceeds to step S308, and each cutting edge is obtained by a well-known arithmetic expression using the XY coordinates of the measurement points Q1 to Q3 and Q4 to Q6 and the measured rotation angles θq1 to θq3 and θq4 to θq6. The plane formula of the upper surfaces of 14A and 14B is calculated. In step S309, by using this plane formula, machining rotation angles θp1 to θp7 at which the machining points P1 to P7 (FIG. 7A) on the upper surface of the cutting edge are the same height as the axis L0, that is, Z = 0, are respectively obtained. Calculate. In step S310, the calculated processing rotation angles θp1 to θp7 are stored in the data storage unit 316.

  In step S311, 1 is added to an integer n representing the number of repetitions of a series of processes, and n is updated. Note that n is set to 0 in the initial state. In step S312, it is determined whether or not n is equal to the number N of the cutting edges 14 in the circumferential direction, that is, whether or not the positions of all the cutting edges 14 in the circumferential direction have been measured. If step S312 is negative, the process proceeds to step S313, and a control signal is output to the servo motor 35c for the C axis via the program interpretation unit 312, and the workpiece W is rotated in the A direction (or B direction) by 360 / N degrees. Let At this time, the work W is rotated after the measurement probe 34 is temporarily retracted to the initial position Qa so that the work W and the measurement probe 34 do not interfere with each other. Next, the process returns to step S <b> 302, and the same processing is repeated for the cutting blade 14 provided in another cutting groove 13. On the other hand, if step S312 is negative, the three-point measurement process ends.

  Note that the one-point measurement process in step S100 and the two-point measurement process in step S200 and the three-point measurement process in step S300 calculate the number of measurement points on the upper surface of the cutting edge and the plane formula of the upper surface of the cutting edge. Only the arithmetic expression is different, and the other processing is the same. Therefore, the description of the one-point measurement process and the two-point measurement process is omitted. On the other hand, in the all-point measurement process in step S400, it is not necessary to calculate the plane formula of the upper surface of the cutting edge. Hereinafter, the all-point measurement process will be described.

  FIG. 11 is a flowchart illustrating an example of the all-point measurement process, and FIG. 12 is a diagram illustrating measurement positions in the all-point measurement process. In step S401, the machining program set by the machining program setting unit 311 is read to create a measurement program PR4 for measuring all points. In this case, the machining points P1 to P7 in FIG. 7A are used as they are as the block end points of the measurement program. As a result, as shown in FIG. 12, measurement points Q1 to Q7 are set at the same positions as the processing points P1 to P7 in FIG. 7A, and block end points Qa, Qb, Q1 to Q3, Qc to Qe, Q4 to A bent straight line connecting Q7 and Qf in sequence becomes the moving path PA4 of the measurement probe 34. This movement path PA4 is the same as the movement path PA0 of the workpiece electrode 9 (FIG. 7A). As in the case of the three-point measurement process, commands other than the movement of the upper head 15 set in the machining program are canceled in the measurement program PR4. In addition, when the all-point measurement process is executed, the diameter correction is not performed regardless of whether the diameter correction ON signal is output.

  In step S402, control signals are output to the servo motors 35a and 35b for the X axis and the Y axis via the program interpretation unit 312, and the measurement probe 34 is sequentially moved to the block end position based on the measurement program PR4. In step S403, based on the diameter correction ON / OFF command output for each block end point, whether or not the measurement probe 34 is within the range in which the diameter correction ON command is output, that is, one of Q1 to Q7 in FIG. It is determined whether or not the measurement probe 34 is located.

  When step S403 is affirmed, the process proceeds to step S404, and when negative, the process returns to step S402. In step S404, a workpiece normal rotation command is output to the interpolation processing unit 313 via the program interpretation unit 312. As a result, the workpiece W rotates in the direction A in FIG. 6 at a predetermined speed, the upper surface of the blade portion of the tool 10 contacts the measurement probe 34, and the measurement probe 34 outputs an ON signal. When the ON signal is output from the measurement probe 34, the interpolation processing unit 313 outputs the current rotation angle θq of the workpiece W to the measurement sequence processing unit 310 and controls the servo motor 35 c via the servo control unit 314. And the workpiece W is rotated in the B direction until the measurement start angle θa.

  In step S405, it is determined whether or not the rotation angle θq is input from the interpolation processing unit 313. If step S405 is affirmed, the process proceeds to step S406. If negative, the process returns to step S404. In step S406, the rotation angle θq is stored in the memory. In step S407, it is determined whether or not the measurement of the rotation angles θq1 to θq7 at all measurement points Q1 to Q7 on the upper surface of the cutting edge has been completed. If step S407 is negative, the process returns to step S402, the measurement probe 34 is moved to the next measurement point, and the same processing is repeated. As a result, at all measurement points Q1 to Q7, the rotation angles θq1 to θq7 of the workpiece W from the reference position until the upper surface of the cutting edge comes into contact with the probe 34 can be acquired. In this case, since the measurement points Q1 to Q7 are the same as the machining points P1 to P7, the rotation angles θq1 to θq7 stored in the memory become the machining rotation angles θp1 to θp7.

  If step S407 is affirmed, the process proceeds to step S408, where 1 is added to an integer n representing the number of repetitions of a series of processes, and n is updated. In step S409, it is determined whether or not n is equal to the number N of the cutting blades 14 in the circumferential direction. If step S409 is negative, the process proceeds to step S410, a control signal is output to the servo motor 35c for the C axis via the program interpretation unit 312, and the workpiece W is rotated in the A direction (or B direction) by 360 / N degrees. Let Next, the process returns to step S402, and the same processing is repeated for the cutting edge 14 provided in another cutting groove 13. On the other hand, if step S409 is negative, the all-point measurement process ends.

  Next, the processing control unit 32 in FIG. 1 will be described. FIG. 13 is a block diagram illustrating a configuration of the machining control unit 32. In the figure, the same parts as those in FIG. The machining control unit 32 is centered on the program conversion processing unit 321, and includes a program storage unit 322, a machining program setting unit 311, a program interpretation unit 312, an interpolation processing unit 313, a servo control unit 314, and a data input unit 315. And have. In particular, when compared with the measurement control unit 31, the machining control unit 32 is unique in that it has a program conversion processing unit 321 and a program storage unit 322 and does not have a data storage unit 316. A signal from the input device 33 and a signal from the data storage unit 316 are input to the processing control unit 32. The machining control unit 32 outputs control signals to the servo motors 35a to 35e for X axis, Y axis, C axis, U axis, and V axis.

  The machining program set in the machining program setting unit 311 includes machining point data of the machining point P of the workpiece W, that is, data for X axis, Y axis, U axis and V axis of each machining point, and diameter correction. This includes data on the block end point for performing the on / off command, the on / off command for the machining power source, and the like. A signal from the input device 33 is input to the program conversion processing unit 321 via the data input unit 315 and signals from the machining program setting unit 311 and the data storage unit 316 are input. The input information from the input device 33 includes the cutting edge 14 such as the number N of blades in the circumferential direction of the rotary tool 10, a machining start command, a machining via point, a finishing allowance, a driving amount in the X axis direction, a driving amount in the Y axis direction, and the like. Various information on the processing of

  The program conversion processing unit 321 reads the machining point data (data for X axis, Y axis, U axis, and V axis) of each machining point P read from the machining program setting unit 311 from the data storage unit 316. The rotation angle θp data (C-axis data) is added to convert the machining program. That is, the 4-axis machining program is rewritten to a 5-axis machining program. The rewritten program is stored in the program storage unit 322 as a new machining program.

  The program interpretation unit 312 reads and interprets this new machining program, calculates the target movement amount and target rotation angle of each axis by the interpolation processing unit 313 based on the signal from the program interpretation unit 312, and passes through the servo control unit 314. Control signals are output to the servomotors 35a to 35e. In this case, when the machining position changes from one machining point to the next machining point, the interpolation processing unit 313 obtains the target movement amount of the wire electrode 9 between the machining points and the target rotation angle of the workpiece W by interpolation processing. . As a result, the workpiece W rotates around the C axis in accordance with the machining position, and the workpiece W can be machined with the machining position on the upper surface of the cutting edge always set to the same height as the axis L0.

The operation of the rotary tool machining method by the wire electric discharge machine according to the present embodiment is summarized as follows.
(1) Measuring process Before processing the workpiece W, first, the upper surface position of the cutting blade 14 is measured. In this measurement process, the user arranges the measurement probe 34 below the upper head 15, and selects a desired measurement mode from one point measurement, two point measurement, three point measurement, and all point measurement via the input device 33. Select. For example, when the size of the cutting edge 14 is small, the error may increase as the number of measurement points increases. In this case, for example, one-point measurement or two-point measurement is selected. On the other hand, when the cutting edge 14 is sufficiently large and it is desired to ensure the measurement accuracy of the upper surface of the cutting edge with the minimum number of measurement points, three-point measurement is selected. If the upper surface of the cutting edge cannot be approximated accurately with a flat type, all-point measurement is selected.

  The measurement control unit 31 creates measurement programs PR1 to PR4 according to the selected measurement mode (steps S301 and S401), and servos for the X axis, Y axis, and C axis according to the measurement programs PR1 to PR4. A control signal is output to the motors 35a to 35c. As a result, the measurement probe 34 moves to the measurement position on the upper surface of the cutting edge of the tool 10 attached to the rotary indexing device 20 (steps S302 and S402). In this case, with the workpiece W rotated in advance to the measurement start angle θa and the cutting blade 14 retracted, the tip of the measurement probe 34 is moved on the XY plane while maintaining the same height as the axis L0, and the measurement probe is moved. When 34 reaches the measurement point position, the workpiece W is rotated around the C axis, and the upper surface of the cutting edge is brought into contact with the measurement probe 34 (steps S304 and S404). The rotation angle θq of each measurement point at this time is stored in the memory (steps S306 and S406).

(2) Index position deriving step If any one of the one-point measurement, two-point measurement, and three-point measurement is selected as the measurement mode, the rotation of each measurement point when the upper surface of the cutting edge comes into contact with the measurement probe 34 Based on the angle θq, a plane formula of the upper surface of the cutting edge is calculated (step S308). Then, based on this plane formula, a processing rotation angle θp, that is, a target index position, at which each processing point P becomes the same height as the axis L0, is calculated and stored in the data storage unit 316 of the measurement control unit 31 ( Step S310). On the other hand, if all-point measurement is selected as the measurement mode, the measurement point Q and the machining point P are the same, and the rotation angle θq at the measurement point Q is stored in the data storage unit 316 as the machining rotation angle θp as it is. (Step S406).

(3) Processing Step When the processing rotation angle θp at each processing point P is obtained as described above, the wire electrode 9 is stretched between the upper head 15 and the lower head 16 and processing of the workpiece W is started. In this machining process, the machining rotation angle θp data is added to the machining point data to create a new machining program, and by executing the new machining program, the X axis, Y axis, C axis, and U axis The servo motors 35a to 35e for the V axis are controlled. As a result, the workpiece W is determined at the machining rotation angle θp at each machining point P, the machining point P is automatically adjusted to the same height as the axis L0, and the wire electrode 9 moves along the machining point P. Then, the workpiece W is processed by the discharge energy from the wire electrode 9. For this reason, the dimension of the outermost diameter of the workpiece W is determined only by the distance in the Y-axis direction between the wire electrode 9 and the axis L0, and the dimensional accuracy of the outermost diameter of the rotary tool 10 can be improved.

According to the present embodiment, the following operational effects can be achieved.
(1) The tip of the measurement probe 34 is set at the same height as the axis L0 of the rotary indexing device 20, and the rotation angle at which the cutting blade upper surface contacts the measurement probe 34 at the measurement position Q on the cutting blade upper surface of the rotary tool 10 θq is measured, and based on this rotation angle θq, a machining rotation angle θp is derived so that the machining point P on the upper surface of the cutting edge is at the same height as the axis L0. Then, the workpiece W is determined at the machining rotation angle θp at each machining point P, the wire electrode 9 is moved along the machining point P, and the end of the cutting edge 14 is machined by the discharge energy from the wire electrode 9. did. Thereby, the edge part of the cutting blade 14 can be processed on the same plane as the axis line L0, and the dimension of the outermost diameter of the rotary tool 10 can be matched with a design value accurately.
(2) Since the rotation angle θq at the measurement point on the upper surface of the cutting edge is simply measured, and it is not necessary to measure the inclination angle of the cutting edge 14 with respect to the axis L0, the cutting edge 14 is in any direction three-dimensionally. Even if it is attached with an inclination, the position of the machining point can be obtained with high accuracy.

(3) Since the measurement mode for measuring the upper surface position of the cutting blade 14 can be selected by a command from the input device 33, the optimum measurement of the cutting blade upper surface position is possible according to the shape of the cutting blade 14 and the like. It is.
(4) When the measurement mode of one-point measurement, two-point measurement, or three-point measurement is selected, the plane formula of the cutting blade upper surface is calculated based on the measured value θq of the upper surface position of the cutting blade 14, and this plane formula Thus, the machining rotation angle θp at the machining point P is calculated, so that the machining rotation angle θp can be efficiently obtained with a small number of measurement points.
(5) When the all-point measurement mode is selected, the machining point position on the upper surface of the cutting blade is measured, and the measured value θq is set as the machining rotation angle θp, so that the change from the machining program to the measurement program PG4 is minimal. It is easy to create the measurement program PG4. In the all-point measurement mode, even when the upper surface of the cutting edge cannot be approximated by a plane method, such as when the upper surface of the cutting edge is curved, the work point P is set to the same height as the axis L0. Can be processed.

(6) Since the measurement programs PG1 to PG4 are created in a predetermined machining program format, the measurement programs PG1 to PG4 can be easily created for the user who is used to creating the machining program, and the upper surface position of the cutting blade 14 Can be easily measured.
(7) When there are a plurality of cutting blades 14 in the circumferential direction, the measurement program created for the cutting blade 14 in one phase is similarly applied to the cutting blades 14 in another phase. Since it did in this way (step S311-step S313, step S408-step S410), a measurement program can be comprised easily.

  In the above-described embodiment, the processing at the measurement control unit 31 measures the upper surface position of the cutting blade 14 by bringing the upper surface of the cutting blade into contact with the measurement probe 34 (measurement process), and based on the measurement result, The machining rotation angle θp (target index position) at which the machining point P on the upper surface of the cutting edge is the same height as the axis L0 is calculated (index position derivation process), but the index position derivation process is performed by the machining control unit 32. You may make it perform by the process in. That is, only the measured rotation angle θq may be stored in the data storage unit 316, and the program conversion processing unit 321 may perform a planar calculation on the upper surface of the cutting edge and a calculation of the processing rotation angle θp.

  In the above embodiment, the machining control unit 32 creates and stores a new machining program. However, the configuration of the machining control unit 32 is not limited to that described above. FIG. 14 is a block diagram illustrating a modification of the machining control unit 32. In FIG. 14, the program interpretation unit 312 reads and interprets the machining program set by the machining program setting unit 311, and controls the servo motors 35 a to 35 e via the interpolation processing unit 313 and the servo control unit 314. On the other hand, a signal from the data storage unit 316 is taken into the data processing unit 323, and the data processing unit 323 recognizes the processing point P by the signal from the program interpretation unit 312 and sets the processing rotation angle θp corresponding to the processing point P. The data is output to the interpolation processing unit 313. Accordingly, the rotation angle of the workpiece W can be controlled so that the machining point P is at the same height as the axis L0 without rewriting the original machining program. Note that the user may be able to select either the method shown in FIG. 13 (program conversion method) or the method shown in FIG. 14 (real-time control method) via the input device 33.

  In the above embodiment, the rotation angle θq is measured when the workpiece W is rotated from the reference position so that the upper surface position of the cutting edge 14 coincides with the height of the axis L0, but the rotation of the workpiece W is fixed. In this state, the measurement probe 34 may be lowered until it comes into contact with the upper surface of the cutting edge, and the position of the upper surface of the cutting edge 14 may be measured by measuring the probe position when it comes into contact with the upper surface of the cutting edge. Although the measurement program is created and the upper surface position of the cutting blade 14 is automatically measured, the upper surface position of the cutting blade 14 may be measured by manual operation without creating the measurement program. The upper surface position of the cutting blade 14 may be measured by means other than the measurement probe 34, and the configuration of the measuring means is not limited to the above.

  Although the wire electrode 9 can be moved in the X-axis direction and the Y-axis direction by driving the servo motors 35a and 35b, any moving means may be used as long as the wire electrode 9 can be moved relative to the workpiece W. Good. The workpiece W may have any shape as long as it is configured as the rotary tool 10 provided with a blade portion in the tool material. Therefore, the cutting groove 13 is machined into the tool material and the cutting blade 14 is attached. However, the configuration of the blade portion is not limited to this, for example, the outer peripheral surface of the cylindrical tool material itself is processed to remove the blade portion. You may make it form.

  The rotary indexing device 20 indexes the workpiece W so that the machining point P on the upper surface of the cutting edge becomes the same height as the axis L0, and moves the wire electrode 9 along the machining point P on the upper surface of the cutting blade after indexing. As long as the servo motors 35a to 35e are controlled, the internal configuration of the control device 30 as the control means may be any. In the above embodiment, the wire electric discharge machine is configured as a five-axis machine that can move in the X-axis, Y-axis, U-axis, V-axis, and C-axis directions, but the X-axis, Y-axis, and C-axis. You may comprise as a triaxial processing machine which can move to an axial direction. That is, the wire electric discharge machine according to the present invention is characterized in that the machining point on the upper surface of the blade portion is calculated at the same height as the rotation axis, and the present invention is implemented as long as the features and functions of the present invention can be realized. It is not limited to the wire electric discharge machine of the form.

DESCRIPTION OF SYMBOLS 9 Wire electrode 10 Rotating tool 14 Cutting blade 20 Rotation indexing apparatus 30 Control apparatus 31 Measurement control part 32 Process control part 35a-35e Servo motor

Claims (6)

A rotary tool provided with a blade on the tool material is attached to a rotary indexing device so that it can be indexed around a rotation axis extending in the horizontal direction, and the wire electrode moves along the machining point on the upper surface of the blade A rotating tool and a wire electrode are moved relative to each other, and the blade portion is processed by the discharge energy from the wire electrode.
A measuring step of measuring an upper surface position of the blade portion of the rotary tool attached to the rotary indexing device;
Based on the measurement result in the measurement step, an index position derivation step for deriving a target index position such that the machining point on the upper surface of the blade portion is at the same height as the rotation axis;
The rotary tool is indexed to the target index position derived in the index position deriving step, and the wire electrode is moved along the processing point on the upper surface of the blade part of the rotary tool to process the blade part. Processing steps,
The processing method of the rotary tool characterized by including. In the processing method of the rotary tool according to claim 1,
In the measurement step, the rotary tool machining method of measuring a rotation angle when the rotary tool is rotated from a reference position so that an upper surface position of the blade portion to be measured coincides with a height of the rotation axis. In the processing method of the rotary tool according to claim 1 or 2,
In the measurement step, the upper surface position of one point or a plurality of points of the blade part is measured,
In the index position deriving step, a plane equation of the upper surface of the blade portion is calculated based on the measurement value obtained in the measurement step, and the processing of the rotary tool for deriving the target index position based on the plane equation Method. In the processing method of the rotary tool according to claim 1 or 2,
In the measuring step, the position of the processing point on the upper surface of the blade portion is measured,
In the index position derivation step, the rotary tool machining method in which the measurement value in the measurement step is the target index position. In the processing method of the rotary tool of any one of Claims 1-4,
In the measuring step, a rotating tool machining method in which a measurement program is created based on a machining program in which machining point positions are determined in advance, and the measurement program is executed to measure the upper surface position of the blade portion. A rotary indexing device capable of detachably gripping a rotary tool provided with a blade portion on a tool material and indexing around a rotation axis extending in the horizontal direction;
A wire electrode that is proximate to the blade portion of the rotary tool attached to the rotary indexing device and processes the blade portion by discharge energy;
Moving means for moving the wire electrode relative to the workpiece;
An electric discharge machine comprising the rotary indexing device and a control means for controlling the moving means,
A measuring means for measuring an upper surface position of the blade portion of the rotary tool attached to the rotary indexing device;
The control means indexes the rotary tool based on the measurement result of the measuring means so that the machining point on the upper surface of the blade portion is at the same height as the rotation axis, and the upper surface of the blade portion after indexing. A wire electric discharge machine that controls the rotary indexing device and the moving means so that the wire electrode moves along a machining point.

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