JPH02167626A - Measuring/positioning method in electric discharging machine - Google Patents

Abstract

PURPOSE:To realize automation by performing the positioning of an electrode of high accuracy even in case of the electrode being in a complicated shape, in positioning the electrode with high accuracy at the part to be worked of a work roughly fitted to a diesinking discharging machine. CONSTITUTION:A work 106 having reference holes 111 at two places is placed on a fitting jig 103, a measuring probe 203 is fitted to a main shaft 201 as well and the reference holes 111 at two places of the work 106 are detected by using the measuring probe 203 with the positions of the reference spheres 112, 113, 114 located on the fitting jig 103 as origins. Then, based on this detection result the inclination of the work 106 as well as the working reference point of the work 106 are stored by calculating them. An electrode is then fitted to a main shaft 201 and the center point of the electrode is stored by detecting it by using the reference spheres 112 - 114. Then, based on the working reference point and inclination of the work 106 and the stored data concerning the center point of the electrode, the electrode fitted to the main shaft 201 is moved to the working position of the work 106.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a measurement and positioning method in an electrical discharge machine for highly accurate positioning of an electrode on a machined part of a work roughly attached to the electrical discharge machine.

[Prior art] Electrical discharge machines such as mold-boring electrical discharge machines are widely used for manufacturing complex molds, etc., and recently, machines incorporating NC (numerical control) devices and ATC (automatic electrode changing devices) have been widely used. Automatic electrical discharge machines have also appeared.

In addition, as mold products become smaller and more dense, the machining accuracy of electric discharge machines is required to be as high as an error tolerance of ±3 to 6 mm in some cases. It is hoped that this will become a reality.

By the way, the machining degree of the electric discharge machine is on the holder on the main body!
Since the positioning accuracy greatly depends on the positioning accuracy between the placed workpiece and the electrode attached to the spindle, it is essential to correct errors in the mounting of the workpiece and spindle before machining, especially in NC-controlled electrical discharge machines. be.

Figures 17 to 122 are intended to outline a conventional method for adjusting the position between a workpiece and an electrode.

Fig. 17 is a conceptual diagram of the positioning method, Fig. 18 shows the parallel alignment work of the work, Fig. 17 (a) is a plan view, Fig. 19 (b) is a partially cutaway front view, and Fig. 19 is a Figure 20 is a front view showing the electrode centering work, and Figure 20 shows the parallel electrode alignment work. Figure 12I (a) is a left side view, Figure 12I (b) is a right side view, and Figure 21 is a view of the workpiece. FIG. 22 is a conceptual diagram showing a positioning method when there are workpieces at multiple locations, and FIG. 22 is a plan view showing the centering work of an electrode having a complicated shape.

Conventional positioning between the workpiece and the electrode involves TIJ adjustment so that the processing reference line 106b passing through the processed portion 106a of the workpiece 106 is parallel to the plane coordinate axis (X-axis or Y-axis), as shown in 17UA. (Parallel alignment of workpiece)
, the reference point 106c on the processing reference line 106b is determined, and the center OT of the electrode 202 is determined (electrode centering). 1t8i202 so that the side surface of the electrode 202 is parallel to the plane coordinate axis (parallelization of the electrode) First, the center OT of the electrode 202 is moved to the center of the workpiece 106a using the reference point 1O6C as the origin.
The electrode 202 is now positioned with respect to the processed portion 106a of 06.

Here, the parallel alignment of the workpiece 106 is carried out by providing a turntable 400 on the one-body cheatle 101 as shown in FIG. I was doing it. That is, two wooden reference pins 401, 401 are set up on the processing reference line 106b of the workpiece 106, and the sides of the electrode 202 are brought into contact with these reference pins 401 from four directions, and the coordinates of each contact point are used to determine the position of each reference pin 401. Center 0. ,． 0. , find. Center 0, . 0
．． , is the processing reference line 106b, so the line segment connecting the centers 0□ and O□ of the reference pin 401 is
Parallel alignment can be achieved by adjusting the rotary table 400 so that it is parallel to the axis (Y-axis).

In order to perform this parallelization work with micron precision,
The intuition of experts played a major role.

Note that the reference point 106c on the processing reference line 106b is normally set at the center point of the line segment connecting the centers OPl+Op□ of the reference pin 401, so the center 0. ,.

It is inevitably found if a line segment connecting OP2 is detected.

On the other hand, the centering of the electrode 202 is as shown in FIG.
By bringing the side surfaces of the electrode 202 into contact with a reference sphere 402 installed in the electrical discharge machine from four directions, the coordinates of the contact points were determined.

In addition, as shown in FIG. 20, parallelization of the quasi-pole 202 can be achieved by moving the main shaft 201 and attaching the electrode 202 to the probe 403 of the indicator installed in the electrical discharge machine.
This was done by touching the side of the machine and rotating the main shaft while visually checking the display on the indicator. Skill was required to perform this work with high precision.

[Problems to be Solved] The conventional positioning method between the workpiece and the electrode described above requires skill to align the workpiece 106 and the electrode 202 in parallel, and even a highly skilled person cannot achieve an accuracy of ±6P. However, it was impossible to satisfy the accuracy requirement of less than 5 l.

Further, as shown in FIG. 21, workpieces 106a and 106d are formed at multiple locations on the workpiece 106.

106e, each machining reference line 106
b, 106f, and 106g had to be reset to align them in parallel, which had the disadvantage of complicating the positioning work.

Furthermore, as shown in FIG. 22, an electrode 20 with a complicated shape
When centering 2d using the reference ball 402, generally,
The vertices El, E2, E3, and E4 were searched, and the electrode center was calculated based on the coordinates of these vertices. However, it is difficult even for an expert to find the position of the vertex in a complex shape using the reference sphere 402, and
Since it cannot be converted into C, it has been an obstacle in automating the positioning work between the workpiece and the electrode.

The present invention has been made to solve these problems, and by realizing automation, it can be used not only in normal cases but also in cases where the workpiece has multiple parts to be machined or where the electrode has a complex shape. The purpose of the present invention is to provide a measurement and positioning method for a die-sinking electrical discharge machine that can easily and accurately position an electrode with respect to a workpiece, even if the electrode is placed on the workpiece.

[Means for solving problem a] In order to achieve the above object, the first invention, a method for measuring and positioning in an electric discharge machine, involves placing a workpiece having two reference positions on a mounting tool, and Attach a measurement probe to the mounting jig, use the measurement probe to detect two reference positions on the workpiece, using the position of the reference gauge on the mounting jig as the origin, and set the processing standard for the workpiece based on the detection results. The inclination of the workpiece is calculated and memorized together with the point, and then an electrode is attached to the main shaft, and the center point of the electrode is detected and memorized using the reference gauge.

This method moves the electrode attached to the spindle to the processing position of the workpiece based on stored data regarding the processing reference point and inclination of the workpiece and the center point of the electrode.

In addition, the second invention, a measurement and positioning method for a die-sinking electric discharge machine, involves placing a workpiece having reference positions at two locations on a mounting jig, attaching a measurement probe to the main shaft, and placing the workpiece on the mounting jig. Using the position of the reference gauge located at as the origin, detect two reference positions of the workpiece using the measurement probe, and based on the detection results, calculate and store the machining reference point of the workpiece as well as the inclination of the workpiece. Then, an electrode is attached to the main shaft, and the center point and inclination of the electrode are detected and memorized using the reference gauge.

This method moves the electrode attached to the spindle to the processing position of the workpiece based on stored data regarding the processing reference point and inclination of the workpiece, and the center point and inclination of the electrode.

Here, it is preferable to appropriately use a plurality of the reference gauges, particularly as a 2nd & semi-gauge.

The measurement range can be further expanded by using a reference sphere and a reference block, which will be described later.

[Examples] Examples of the present invention will be described below with reference to the drawings.

Figures 1 to 15 are diagrams for explaining the present invention in detail, of which Figure 1 is a perspective view showing the external appearance of a die sinking electrical discharge machine, and Figure 2 is an enlarged view of the ATC portion of the machine. FIG. 3 is an enlarged perspective view of the top surface of the main body table.
FIG. 4 is a block diagram showing the electrical configuration of the control device.

First, the configuration of a die sinking electrical discharge machine for carrying out the measurement and positioning method of this embodiment will be explained with reference to FIGS. 1 to 4.

In FIG. 1, ioo is a processing machine main body, and a main body table lot is provided at the center of the upper surface, and a main shaft 201 is further provided above the main body table 101 via a column 200. on the other hand.

300 is a control device for NC controlling each part of the processing machine main body and for automating the measurement and positioning method of this embodiment.

An electrode 202 for electric discharge machining and a measurement probe 20.3 for carrying out the method of the present invention are attached to the main shaft 201.

As shown in FIG. 2, an ATC 204 is provided on the side of the main shaft 201 to automatically replace the electrodes 202 and measurement probes 203 and attach them to the main shaft 201.
Further, on the side of the column 20-0, a tool stocker 205 is provided that automatically supplies various electrodes 202 and measurement probes 203.

In other words, 1 a measurement probe 203 necessary for measurement and positioning in the method of the present invention and a predetermined electrode 2 necessary for electrical discharge machining work;
02 is a tool stocker 2 placed at a fixed supply position.
From 05 onwards, based on the control signal from the ATC 204 or the control unit 21300, it is clamped and transported to the main shaft 201 for installation.

In addition, the main shaft 201 moves in the X, Y directions, and up and down directions according to control signals from the control device 300, and can rotate around the axis.
The angle is controlled with high precision, with each angle divided into 60,000 units.

As shown in FIG. 3, on the top surface of the main body table 101,
A mounting jig 103 for a member 102 is provided for mounting the workpiece, and in this embodiment, a rectangular flat workpiece is mounted using the member 102.
It is possible to attach two lids together. That is,
The mounting jig 103 includes a positioning guide block 104a,
104b, and the fixing claw 105 is engaged with the engagement surface 102c of the workpiece mounting member 102 with the two mutually contacting edges 102a, 102b of each workpiece mounting member 102 in contact with the guide blocks 104a, 104b. At the same time, the mounting work can be easily performed by simply tightening the fixing claws 105 with bolts. Here, the engagement surface 102c of the workpiece mounting member 102 is an inclined surface, and the fastening force of the fixed claw 105 is applied to the positioning guide block 104.
a.

Since the action is applied in the direction of the corner where 104b contacts, it is possible to achieve a state of installation without wobbling.

In this embodiment, two workpieces 1O6 can be fixed to the upper surface of the workpiece attachment member 102. As the fixing means, a temporary positioning pin 107 for fitting into a reference hole of the workpiece 106, which will be described later, or two pins planted on the upper surface of the workpiece mounting member 102 corresponding to each workpiece 106 are used. In order to prevent this, the fixing piece 108 can be fastened to a screw hole 110 with a screw 109.

In this embodiment, the workpiece 106 is, for example, a steel block with a circular cross section for forming a small cavity, such as a mold for manufacturing the main plate of a wristwatch. In this work 106, reference holes 111 and 111 are pre-drilled at two symmetrical positions with respect to the center Ow.

In FIG. tj43, 112, 113, and 114 are reference spheres of different sizes, and 115 is a reference block formed into a rectangular parallelepiped, each of which is fixed to the edge of the mounting jig 103. It consists of a reference gauge in the measurement and positioning method.

As shown in FIG. 4, the control unit W1300 includes measurement processors 301. n constant calculation processor 302゜measurement result storage device 303. The main part consists of a set error correction processor 304.

The measurement processor 301 includes a reference gauge position measurement unit 305
．． It has a workpiece measuring section 306 and an electrode measuring section 307, and each of these sections inputs predetermined measurement command data from a data reading processor 308, performs measurements to be described later by controlling the spindle 201, and performs measurement calculations on the measurement results. Output to processor 302. Here, the work measuring section 30
6 and the electrode measurement unit 307 receive data on the workpiece and electrode to be measured (for example,
It is possible to input the shape and size of the workpiece and perform measurements according to the type of workpiece and electrode.

The measurement calculation processor 302 calculates and processes the measurement results input from the measurement processor 301, and calculates the reference gauge position, workpiece information (center position and tilt angle of the workpiece, etc.), 'rr
! , calculate polar information (type information center position, tilt angle, etc.).

The measurement result storage device 303 includes the measurement calculation processor 302
A workpiece information storage device 311 that stores the workpiece measurement results calculated in , and an electrode information storage device 312 that stores electrode information.
It is made up of.

The set error correction processor 304 includes a work set error correction section 313 and an electrode error correction section 314.
The position of the workpiece 106 is corrected based on the workpiece information from. In addition, the electrode error correction unit 314 or the electrode information storage device 2
The position of the electrode 202 is corrected based on the electrode information input from 1312.

Next, the measurement and
The positioning method will be explained based on FIGS. 5 to 14.

FIG. 5 is a flowchart showing the implementation procedure of the measurement/positioning method of this embodiment, and FIG. 6 is a perspective view showing the operation of the workpiece measuring probe.

First, operate the tool stocker 205 and ATC 204, attach the measurement probe 203 to the main shaft 201 (Fig. Recognize the coordinates of the main axis 201 (Figures 5 and 6).

Next, the reference sphere 113 is positioned by bringing the tip of the measuring probe 203 into contact with a standard sphere (for example, 113) of an appropriate size (Fig. 5.6 ■). This positioning is shown in Fig. 4. This is performed under the control of the reference gauge position measuring section 305 shown in FIG.

Figure 7 shows the positioning operation of the reference sphere.
) is a front view, and (b) is a plan view. As shown in these drawings, the positioning of the reference sphere 113 is based on the reference sphere 11.
3, the measurement probe 203 is contacted from above and from four mutually perpendicular directions (x, y directions) on the horizontal plane.

As a result of this measurement operation, the measurement probe 203
The height coordinates (Z-axis coordinates) of the main axis 201 when it touches the upper end of 3 or the height of the reference sphere 113, and the height coordinates of the main axis 201 at the four points where the measurement probe 203 makes contact from the X and Y directions.
Based on the plane coordinates of 01, the plane position of the center point, that is, the plane position of the center point of the reference sphere 113 can be calculated.

This calculation is carried out by the measurement@calculation processor 302 shown in FIG.
Executed by

After positioning the 2 & semi-sphere 113, the measurement probe 203 is relatively moved above the reference block 115, and the reference block 115 is positioned (Fig. 5.6 -).

FIG. 8 is a front view showing the positioning operation of this reference block. That is, as shown in the figure, the measurement probe 20
3 is lowered, and the coordinates of the main axis 201 when it contacts the top surface of the reference block 115 are determined, and these coordinates are set as the position coordinates of the reference block 115.

Positioning of the reference sphere 113 and reference block 1 described above
The respective position coordinates obtained by the 15 positionings (these are collectively referred to as "reference gauge positioning") serve as the reference (origin) for subsequent measurements, positioning, and processing.

After positioning the M semi-gauge, the measurement probe 203 is relatively moved above the workpiece 106 attached to the workpiece attachment member 102 on the mounting jig 103, and the workpiece 106 is measured (FIGS. 5 and 6).

FIG. 9 shows a method for measuring the workpiece 106.
(a) is an enlarged cross-sectional view of the reference hole in the workpiece, (b)
is also an enlarged plan view, and FIG. 3(c) is a conceptual diagram showing the measurement results.

First, as shown in (a) and (b) of the same figure, the measurement probe 203 is lowered and brought into contact with the upper surface of the workpiece 106.

As a result, the height of the workpiece 106 is kept constant al, and then the measurement probe 203 is inserted into the reference hole 111, and is relatively moved in four directions (X, Y directions) perpendicular to each other, and brought into contact with the inner surface of the reference hole 111, respectively. Then, the plane coordinates of the main axis 201 at each contact point are input to the workpiece measurement unit 306 of the control device 300, and based on the plane coordinates of each contact point, the arithmetic processor 302 determines the position of the center point, that is, the center point of the reference hole 111. Calculate the plane coordinates (x,,y,) of.

Similarly, the plane seat In (Xb, Yb) of the center point of the other reference hole 111 of the workpiece 106 is calculated, and from these measurement results, the inclination angle θ of the workpiece 106 is calculated.
The measurement calculation processor 302 calculates the center Ow digit 22 (X, , Y, ) as the machining reference point of the workpiece 1 and the workpiece 106 based on the following equation. Here, Xb-=Xb X, Yb-=Yb Y-...(I
).

The above-mentioned workpiece measurement is performed on each workpiece attached to the workpiece mounting member 102 on the mounting jig 103 (in this embodiment,
The process is performed sequentially for 4 workpieces) 106. and,
Measurement results of workpiece 106 (position of center Ow, inclination θl)
is stored in the work information storage device 311 shown in FIG.

After the measurement of the workpiece is completed, in order to reduce measurement errors and obtain high accuracy, the above-mentioned reference ball 113 is positioned again with the a constant probe 203 rotated 180 degrees around the axis (Figs. 5 and 6). ). In other words, if the measurement probe 203 is attached to the main shaft 201 at an angle, the main shaft 201
The measurement probe 203 does not align with the center of the mouth, resulting in a measurement error. Therefore, the measurement probe 203 is
The reference sphere 113 is rotated 80 degrees, and in this state, the reference sphere 113 is positioned again. If there is an error between the data and the first measurement, the error is corrected by taking the average value of the remeasurement results.

Next, the tool stocker 205 and the ATC 204 are activated, and instead of the measurement probe 203, all the electrodes 202 necessary for machining are sequentially attached to the main shaft 201 (FIG. 5), and electrode measurement is performed.

Figure 10 shows an example of the shape of an electrode used in die-sinking electrical discharge machining. Figure 10 (a) is a front view of a round hole pipe-shaped electrode;
The same figure (b) is also a bottom view, the same figure (c) is a front view of a simple irregular bottom type electrode, the same figure (d) is also a bottom view, and the same figure (e
) is a front view of a simple irregular-shaped inclined bottom electrode, FIG. 2(f) is a bottom view, FIG.

The electrode measurement consists of measuring the electrode height, measuring the polar parallelism, and measuring the electrode center, and the measurement contents differ depending on the shape of the electrode 202. That is, the round hole vibrator type electrode 202a (
Fig. 10 (a), (b)) and complex irregular bottom electrode 2
02d (same figure (g).

Regarding (h)), W polar parallelism is not measured.
In addition, a complex irregular bottom-shaped electrode 202d and another electrode 202a
, 202b, and 202c differ in the method of measuring the center of the electrode.

The electrode height is measured by bringing the tip of the electrode 202 into contact with the top end of the reference sphere 113 or the top surface of the reference block 115. In other words, the height coordinate of the main axis 201 (Z-axis coordinate) when the electrode 202 contacts ) indicates the height of the electrode 202, where the measurement of the electrode height is as shown in FIG. 10(e),
The reference block 115 is used for the simple odd-shaped inclined bottom electrode 202c shown in (f), and the other electrode 202a.

The reference sphere 113 is used for 202b and 202d.

This is because in the case of the simple odd-shaped inclined bottom electrode 202c, since the bottom surface is inclined, a contact state can be more reliably obtained with the upper surface of the reference block 115. In addition, the measurement results of the electrode height will be used in the subsequent measurement 1 positioning and processing.
This is used as control data when moving the electrode 202 up and down.

Figure 11 shows the method for measuring electrode parallelism.
Figure a) is a front view, figure (b) is a bottom view, and figure (c) is a conceptual diagram showing the measurement results.

The electrode parallelism is measured with respect to the simple irregular bottom electrode 202b and the simple irregular inclined bottom electrode 202c, and as shown in FIGS.
This is carried out by contacting the two points PL and Ps at both ends of the side surface of the electrode 202 (Fig. 5 ■).
(1') Plane coordinates (Xt, Y+), (x,.

y2) is sent to the measurement calculation processor 302 via the electrode measurement section 307 shown in FIG. Then, the measurement calculation processor 302 calculates the inclination angle θ of the electrode 202 based on the following equation.

X+t=X+ Y2. Y12=YI Y2”・(
■) X here, 2. Y, ,indicates the distance between each contact point,p,,,p,on the X,Y coordinate axes.

FIG. 12 shows a method for measuring the electrode center for electrodes other than the complex irregular bottom type electrode 202d. FIG. 12 (a) is a bottom view showing the measurement points of the electrode in the same method, and FIG. FIG. 2C is a bottom view showing the relationship between the amount of deviation of the center of the main axis and the center of the electrode.

By the way, since the main axis center 01 and the electrode center 07 are generally not coaxial, it is only possible to directly measure the plane coordinates of the electrode center OT. Therefore, in this embodiment, the main axis 0. The electrode center Oa is determined from the plane coordinates of (tpJ5 diagram o).

That is, arbitrary points Q,,Q, on each side of the electrode 202 as shown in FIG. 12(a).

Q, , Q, are brought into contact with the reference sphere 113 as shown in FIG. plane coordinates (X3.Y
)) are respectively measured by the electrode measuring section 307 (see FIG. 4).

The electrode 202 is rotated 180 degrees around the main axis center O5,
Perform the above measurement again and find that the spindle center is 0. plane coordinates (x,
, y4).

Then, the degree measurement calculation processor 302 calculates the deviations ΔX, ΔY of the main axis center O, on the X and Y axes before and after rotating the electrode 202 by 180 degrees, and further calculates the electrode center Oa by the following steps. (See @Figure 12 (c))
.

△X=X, -X,, ΔY=Y:+ -Y4 ・ (V
l) On X, YIkb between main axis center 08 and electrode center 01 (') distance tll X ffT+ Y 3T is Xjt
=ΔX÷2, Yzt=ΔY+ 2 − (Vi[
) The plane seat m of the center OT of the electrode (XT, Ya〉 is
X7 = Xz + X3 r, Yt =
Yx +Y:l? ... (Vl) FIG. 13 is a bottom view showing a method for measuring the electrode center regarding the complex irregularly shaped bottom electrode 202d.

In the case of the complex odd-shaped bottom-shaped electrode 202d, as shown in the same figure, the electrode 202d is rotated 0 degrees, 180 degrees, -90 degrees, and -270 degrees around the main axis 201, and the sides of the reference block 115 are rotated. force IjI].

Then, the four vertices R1 and Rt of the same electrode 202d
, R1, R- automatically contact the reference block 115, so no complicated operation is required. Then, the plane coordinates of the main axis 201 in each contact state are measured, and the point located at the center of each of these plane coordinates is determined. Measure the plane coordinates of the calculation processor 3
02 indicates the plane coordinates of this center point, that is, the position of the electrode center.

The measurement results of the electrode parallelism (inclination θ2) and the electrode center OT described above are stored in the electrode information storage device 312 shown in FIG. 4 for each electrode 202 required for processing (see FIG.
).

After the above measurement and positioning operations are completed, the electrode 202 necessary for electrical discharge machining is attached to the spindle 201 and machining work begins. (
m5f3@) First, the center OT of the Ttt pole 202 is warped tO6(7
) to the center Ow (FIG. 5, 4)), at this time, the measurement data regarding the electrode center 0° is read out from the electrode information storage device 312, and the measurement data regarding the workpiece center Ow is also read out from the workpiece information storage device 311. Based on the data, the set error correction processor 304 corrects the relative position error (FIG. 5, Q, ■).

Next, the center Oa of the electrode 202 is relatively moved from the center Ow of the workpiece 106 to the center position of the part to be processed. Then, measurement data regarding the inclination θ2 of the electrode 202 is read out from the electrode information storage device 312, and measurement data regarding the inclination θ1 of the workpiece 106 is read out from the workpiece information storage device 311, and based on these data, the set error correction processor 304 Correct the tilt error (Fig. 5 [Stock], ■).

FIG. 14 is a plan view showing the relative positional relationship between the workpiece and the electrode. As is clear from the figure.

There is an error of 0L-02 between the inclination θ of the work 106 with respect to the X axis and the inclination θ2. Therefore, in the case of the relative positional relationship as shown in the figure, if the main shaft 201 is rotated by 01-02 in the clockwise direction in the figure, the workpiece 106 and the electrode 20
2 is corrected.

By the way, since the workpiece 106 is still tilted O1 with respect to the X axis, if the electrode 202 is moved from the center Ow of the workpiece 106 to the center of the workpiece based on the design drawing, , a positional deviation x, y of the electrode occurs due to the above-mentioned inclination θ1, and as a result, a constant relative positional error Xc,
Yc is generated. These relative position errors X c , Y c are derived from the following equations when the main axis 20 is
It is corrected by moving 1. Note that this correction is automatically performed by a known rotation function that the electrical discharge machine has.

In the case of the complex irregular bottom-shaped electrode 202d, the parallelism between the workpiece 106 and the electrode 202 is set in advance, and the respective centers 0, . Only the relative position error of 0T is corrected.

After correcting the error between the workpiece 106 and the electrode 202 as described above and positioning the electrode 202, the electrode 202 is lowered toward the part to be processed of the workpiece 106,
Perform electrical discharge machining.

FIG. 15 is a perspective view showing the operation of the electrode during electrical discharge machining. As shown in the figure, electric discharge machining is performed on four works 106 attached to the workpiece attachment member 102 on the attachment jig 103 while sequentially moving the electrode 202. At this time, the above-described error correction between the work 106 and the electrode 202 is performed for each work 106.

By the way, when, for example, four electrodes 202 are required for each of the four workpieces 106 from rough machining to finishing machining as in this embodiment, conventionally, two measurements, two positioning and machining operations are required for each workpiece. Because these were performed independently, a total of 16 electrodes were required. On the other hand, according to the method of this embodiment, each workpiece 106 is sequentially processed, and if the processing order is set as shown in the table below, the four 'fiL8i' Four workpieces 106 can be processed.

Furthermore, even when a single workpiece 106 has a plurality of workpiece parts, by reading out the workpiece measurement results and electrode measurement results stored in the measurement result storage device 303, the distance between the workpiece 106 and the electrode 202 can be adjusted. Since errors such as relative position 2t and #l can be corrected, there is no need to perform measurement work for each part to be machined, and the work can be simplified and speeded up.

Note that the present invention is not limited to the above-mentioned embodiment, and can be applied to electrical discharge machining using electrodes other than those shown in FIG. can also be applied.

Although the above embodiment has been described for an electric discharge machine having a structure in which the main shaft 201 moves in the X and Y directions, it can also be applied in exactly the same manner to a structure in which the main body table lot moves in the X and Y directions.

The reference position on the workpiece is not limited to the reference hole 111 as in the above embodiment, but also the conventional reference pin 401 (first
(See Figure 8).

Furthermore, the processing reference point on the workpiece was made to coincide with the workpiece center Ow in the above embodiment, but as shown in FIG. It may be set to Further, as shown in FIG. 2B, one reference position (the center of the reference hole 111) may be set as the processing reference point 04. In addition, in the same figure (b), the processing reference point oQ is made to coincide with the workpiece center Ow.

[Effects of the Invention] As explained above, according to the method of the present invention, most of the measurement and positioning work in die-sinking electric discharge machining can be automated. Even if the electrode has a complicated shape, the electrode can be easily and accurately positioned relative to the workpiece.

[Brief explanation of the drawing]

1 to 15 are diagrams for explaining the present invention in detail.
The figure is an enlarged perspective view of the ATC part of the same processing machine.
4 is a block diagram showing the electrical configuration of the control device, FIG. 5 is a flowchart showing the procedure for implementing the measurement and positioning method of this embodiment, and FIG. 6 is an enlarged perspective view of the top surface of the main body. is a perspective view showing the operation of the workpiece measurement probe. Figure 7 shows the positioning operation of the reference sphere.
) is a front view, (b) is a plan view, No. 8I2I is a front view showing the positioning operation of the reference block, FIG. 9 is a method for measuring the workpiece, and (a) is the reference hole in the workpiece. Figure 10 (b) is an enlarged plan view, Figure (C) is a conceptual diagram showing the measurement results, and Figure 10 shows an example of the shape of an electrode used in die-sinking electrical discharge machining. Figure (a
) is a front view of the round-hole pipe-shaped electrode, (b) is a bottom view, (c) is a front view of a simple irregular bottom-shaped electrode, (d) is a bottom view, and ( e) is a front view of a simple irregular-shaped inclined bottom electrode, (f) is a bottom view, and (g)
) is a front view of a complex irregular bottom-shaped electrode, FIG. 11 (h) is a bottom view, and FIG. 11 shows a method for measuring electrode parallelism. is a bottom view, the same figure (c
) is a conceptual diagram showing the measurement results, and Figure 12 shows a method for measuring the center of the electrode for electrodes other than complex irregular bottom type electrodes. , the same figure (b) is a bottom view showing the measurement operation, the same figure (C
) is a bottom view showing the relationship between the deviation amount of the main axis center and the electrode center, Fig. 13 is a bottom view showing the method for measuring the electrode center regarding a complex irregular bottom electrode, and Fig. 14 is the relative position between the workpiece and the electrode. FIG. 15 is a plan view showing the relationship, and a perspective view showing the operation of the electrode during electrical discharge machining. FIGS. 16(a) and 16(b) are plan views showing application examples in which the setting of the machining reference point of the workpiece is changed. Figures 17 to 22 are intended to outline the conventional method of positioning between a workpiece and an electrode. Figure 17 is a conceptual diagram of the positioning method, and Figure 18 is a process for parallelizing the workpiece. Figure (a) is a plan view, and figure (b) is a partially cutaway front view. Figure 19 is a front view showing the electrode centering work, Figure 20 []
Figure 21 shows the parallel alignment work of the electrodes; Figure 21 (a) is a left side view, Figure 21 (b) is a right side view, and Figure 21 shows the positioning method when the workpiece has multiple parts to be machined. The conceptual diagram shown in FIG. 22 is a plan view showing the centering work of an electrode having a complicated shape. 100: Processing machine main body 101 "Main body table 102:
Workpiece mounting member 103: Mounting jig 106: Workpiece
111: Reference hole 112.113, 114: Reference ball 115: Reference block 2oo: Column 201: Main shaft 2o2. Electrode 203/Measurement probe 3
00: Control device 301: Measurement processor, 302: Measurement calculation processor 303: Measurement result storage device 306: Work measurement section 307: Electrode measurement section 308:
Data reading processor 311, work information storage device 312: electrode information storage device 313: work set error correction section 314: electrode error correction section

Claims (2)

[Claims] (1) Place a workpiece having two reference positions on a mounting jig, attach a measurement probe to the main shaft, and use the measurement probe to measure the The two reference positions of the workpiece are detected, and based on the detection results, the machining reference point of the workpiece and the inclination of the workpiece are calculated and memorized. Next, an electrode is attached to the spindle, and the electrode is adjusted using the reference gauge. The electric discharge is characterized in that the electrode attached to the spindle is moved to the machining position of the workpiece based on the stored data regarding the machining reference point and inclination of the workpiece and the center point of the electrode. Measurement and positioning methods for processing machines. (2) Place a workpiece having two reference positions on the mounting jig, attach a measurement probe to the main shaft, and use the measurement probe to measure the The two reference positions of the workpiece are detected, and based on the detection results, the machining reference point of the workpiece and the inclination of the workpiece are calculated and memorized. Next, an electrode is attached to the spindle, and the electrode is adjusted using the reference gauge. detects and memorizes the center point and inclination of the electrode, and moves the electrode attached to the spindle to the processing position of the workpiece based on the memorized data regarding the processing reference point and inclination of the workpiece and the center point and inclination of the electrode. A measuring and positioning method for an electric discharge machine characterized by: