JPS61279453A - Measuring method for machining shape of workpiece in processing machine - Google Patents

Abstract

PURPOSE:To enable the completion of proper machining in a short time by measuring the coordinates of predetermined points on the electrode of an electrospark machining device, a clearance between a workpiece and the electrode made in contact therewith, and the machining shape of a workpiece on the basis of the results of the aforesaid measurements and the electrode shape. CONSTITUTION:A slide table 102 in an X-direction, a slide table 104 in a Y-direction and a slide means 54 in an electrode Z-direction are connected to a driving circuit 56 and move in X, Y and Z directions, driven through said circuit 56. Furthermore, the coordinate of a touch sensor 52 when in contact with the surface of the shape of an electrode 124 is memorized by CPU60. And a plurality of electrode surface coordinates as obtained from the contact of the touch sensor 52 with a plurality of measuring points on the electrode 124 is inputted in a posture operation circuit 62. Furthermore, data stored in CPU60 as an electrode surface coordinate for correct posture is also inputted in the operation circuit 62. In this operation circuit 62, all the aforesaid data are compared for the calculation of proper posture and the result thereof is memorized in CPU60. According to the posture so obtained, a posture control device 42 is driven by a posture correction driving circuit 64.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for measuring the shape of a processed portion of a workpiece during processing. Such a method is suitably applied in electrical discharge machining, etc., where the shape of the tool is directly transferred to the shape of the machined part.

[Conventional technology and its problems]

Electrical discharge machining is commonly used as one of precision machining methods. Electrical discharge machining uses a tool as an electrode to generate an arc discharge in a minute gap between the workpiece and the workpiece, thereby removing a small amount of the workpiece surface and machining the workpiece into a shape that corresponds to the shape of the tool. It is something to do.

According to electrical discharge E, it is possible to machine tough materials and high hardness materials that are difficult to machine into accurate shapes, and the surface can also be made relatively fine.Furthermore, as long as electrodes are made, any shape can be formed. Since it is also possible to process
Processing is used, for example, to manufacture molds for press loading.

A conventional example of an electrical discharge machine used for such electrical discharge machining is shown in FIG.

In the figure, 102 is an X-direction slide table,
104 is a Y-direction slide table provided on the X-direction slide table 102, and a machining liquid storage tank 106 is fixed on the Y-direction slide table 104. 108 is a workbench provided in the tank 106, and a workpiece 110 is fixed on the workbench 108. Note that during machining, a machining fluid such as water or oil is stored in the tank 106. 112 is a column, 1
14 is a tile, 118 is an insulating plate, 118 is a chuck, 120 is a rotary head, 122 is an electrode holder, and 124 is an electrode, that is, a tool.

The rotating head 120 can rotate around the Z direction with respect to the chuck 118. That is, a protrusion 120a facing in the horizontal direction is fixed to the rad 120 for one rotation.
On the other hand, a rotation adjustment screw 118a abuts on the wheel 7 lever 118 from both sides in the rotation direction of the protrusion 120a around the Z direction.

118b is attached. Therefore, two M adjustment screws 11
By operating 8a and 118b, the rad 120 can be rotated relative to the chuck 118.

Further, the electrode holter 122 has adjustment screws f22a and 1 that are brought into contact with the electrode 124 from the X direction and the Y direction.
22b is provided, and the adjustment screws 122a, 12
2b, the inclination of the electrode 124 in the Z direction can be corrected. That is, the adjustment screw 122a
The 1tt pole 124 is rotated by an appropriate angle in the Y direction by operating the 1tt pole 124, and the electrode 124 is rotated by an appropriate angle in the X direction by operating the -force adjustment screw 122b.

During electrical discharge machining, the electrode 124 is connected to the column 112.
is moved downward along the Z direction, and discharge is started at a position where the gap between the electrode 124 and the workpiece 110 becomes minute. Thereafter, the discharge is performed while moving the electrode 124 downward little by little, the discharge is stopped at a predetermined position, and the electrode 124 is moved upward. As a result, work 1
A processed surface corresponding to the shape of the lower and side surfaces of the electrode 124 is formed on the electrode 10 .

However, in conventional electrical discharge machines like the one shown below,
Since the posture of the electrode 8i124 attached to the electrode holder 122 is not necessarily accurate, after attaching the electrode 124, while moving the electrode up and down, the reference plane 124a formed on the electrode surface or the side surface of the electrode 124, 124b is brought into contact with the dial gauge to measure the inclination of the electrode, and based on the measurement results, the iA alignment screws 122a and 122b are operated L[
The 7R pole 124 is rotated around the X direction and around the Y direction, and the workbench is rotated in the
or Y direction to measure the rotation of the electrode around the Z direction, and based on the measurement results, operate the 1111 setting screws 118a and L18b to rotate the electrode 124 around the Z direction. Adjustment to a desired electrode posture is performed by using the following method.

On the other hand, in electrical discharge machining, one electrode is used to
Only one shape can be machined, so multiple electrodes are required when performing complex machining, and electrodes must be replaced in the electric discharge machine. In addition, when machining the same shape in discharge layering, in order to keep the finishing accuracy at a good level, rough machining is first carried out using an electrode for finishing, and then machining is performed using an electrode for finishing. In this case as well, electrode replacement is performed in the electric discharge machine.

Depending on the type of work, it may take up to 10 minutes to finish.
Zero or more itt poles may be used.

Therefore, in conventional electrical discharge machining, the attitude of the electrode is manually measured as shown in L each time the electrode is connected to the electrical discharge machine, and the attitude of the electrode is adjusted within a desired range based on this measurement. things are being done.

For this reason, the time required for the preparation step 1 for closing the discharge layer is long, and no improvement in work efficiency can be expected.

For this reason, attempts have been made to automatically replace the electrodes using an automatic electrode exchange device to reduce the setup process time and manual labor, but current automatic electrode exchange devices are prone to exchange errors. Furthermore, conventionally, the feed dimension of the tool during machining is often set uniformly depending on the tool and the machining section, and therefore sufficient machining accuracy cannot be obtained if the machining is performed in the same position.

In addition, in electrical discharge machining, a machined part is formed with a shape that corresponds to the electrode shape as described above, but in reality, the shape of the machined part changes due to thermal expansion of the workpiece and subtle fluctuations in machining conditions. Change. In other words, even if the electrode position is the same, the shape of the machined part formed will not necessarily be the same.When high machining accuracy is required, it is necessary to take some steps to correct even such minute shape changes. After machining, the shape of the machined part is measured, and based on the measurement results, corrective machining is sometimes performed to remove a small amount using precision feed in order to finally obtain the desired shape.

However, to measure the shape of the machined part for such correction machining, a measuring ball is attached to the electrode holder instead of the conventional electrode.
This was carried out by bringing the measuring ball into contact with the processed part.

However, this measurement method has a problem in that it is not possible to measure delicate shapes smaller than the size of the measuring sphere with high accuracy.

For this reason, it has conventionally been thought that high precision machining cannot be performed automatically in electrical discharge machining.

The above-mentioned problems occur not only in discharge application 1 but also in irJ.

This may also exist in general processing machines that require replacement.

[Means for Solving the Problems] According to the present invention, in order to solve the problems of the prior art as described below, the coordinates of a predetermined point in one or more of one container are determined in advance by 31
The tool is moved relative to the workpiece and brought into contact with the adding surface, and the gap distance between the tool and the workpiece in the above movement direction is measured by the amount of movement of one tool at this time. The present invention is characterized in that the coordinates of the point on the machining section corresponding to the L tool predetermined points are calculated by calculation from the one or more gap distances thus measured, the coordinates of the tool predetermined points, and the tool shape.

A method for measuring the shape of a machined part of a workpiece in a processing machine is provided.

[Example] Hereinafter, specific examples of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a specific example of an electric discharge machine used in a machining system to which this practical addition 1: part shape measurement method is applied. In this figure, the same members as in FIG. 12 are given the same reference numerals, and their explanations will be omitted.

In the figure, 42 is an attitude control device. 44 is an insulating plate, 46 is an electrode mounting face plate, 48 is a pull stud chuck, and 50 is an electrode holder. Also,
52 is a touch sensor.

The L posture control device 42 has the electrode 124 side (that is, the lower side)
It can be rotated independently around this direction, around the Y direction, and around the Z direction, and this rotation is performed by a command from an appropriate drive circuit (described later).

Further, FIG. 2 is a block diagram showing the configuration of a control system of the electrical discharge machine shown in FIG. 1 above.

In the figure, an X-direction slide table 102, a Y-direction slide table 104, and an electrode Z force surface sliding means 54 of the electrical discharge machine main body are connected to a drive circuit 56.
They are moved in the X direction, Y direction, and X direction, respectively, by means of a specific circuit. Further, the coordinates of the touch sensor 52 when the touch sensor 52 moves in the X direction, Y direction, and Z direction and touches the shaped surface of the electrode 124 can be stored in the CPU 60. Then, a plurality of electrode surface coordinates obtained by bringing the touch sensor 52 into contact with a plurality of measurement points of the electrode 124 are manually inputted to the posture margin calculating circuit 62, and further stored in the CPU 60 as coordinates of the electrode surface in the correct posture. The data stored in the arithmetic circuit 62 is also input to the arithmetic circuit 62.
In this case, the amount of posture is calculated by comparing these data.

The results are stored within the CPU. Based on this amount of attitude, the attitude correction drive circuit 64 controls the attitude control device 42.
is driven. As a result, the attitude control device is driven to bring the attitude 41 closer to the correct attitude.

Incidentally, an electrode exchange device 2!66 is also connected to the CPU 60.

FIG. 3 is a schematic flow sheet showing an example of the above-mentioned Kandy system.

First, the electrode exchange device 66 performs electrode exchange on the electrode holder 50 of the electrical discharge machine (step 3-1).
In this electrode exchange, if the electrode used for the previous machining is attached to the electrode holder 50 of the electric discharge machine, it will be replaced with a new electrode, and if the electrode is attached to the pull-stat chuck. If not, only a new electrode will need to be installed. At this time, in order to correct the tilted position due to attitude control, an attitude control orientation command signal is sent from the CPU 60 to the attitude correction drive circuit before the next electrode exchange. After the orientation, the end signal is received from the attitude control device and the electrode exchange operation is started.

After a new electrode is installed in the electric discharge machine, control is performed to correct the orientation of the electrode (step 3-2).This electrode orientation control involves measuring the orientation of the installed electrode. After that, it is determined whether the posture is within the desired tolerance range, and if it is not within the range (9), the electrode posture is corrected, the posture is further measured, and this is repeated to obtain the desired accuracy. This is done by taking an inner posture.

After the newly attached electrode is in the desired posture, the electric discharge machine is operated to move the electrode close to the workpiece and perform electric discharge machining (step 3-3).

Through the above steps, accurate electric discharge machining regarding the electrode is completed. Subsequently, in order to perform accurate electrical discharge machining using another electrode, steps 3-1 to 3-3 may be repeated.

Next, details of the electrode attitude control step 3-2 will be explained.

During machining, the electrode moves in the Y direction relative to the workpiece, so when measuring the posture of the electrode, the rotation angle around the What is necessary is to find the rotation angle around the X direction and the Z direction, that is, the Z rotation.

Therefore, a rectangular electrode 124 as shown in FIG.
In this case, the coordinates of the electrode plane on a plane parallel to the Z-X plane are measured in order to obtain the X-axis. As measurement points, for example, two points (Xl, X2) from the side surface of the electrode or two points (X3, X4) from the bottom surface of the electrode are selected. Similarly, the coordinates of the electrode plane on a plane parallel to the Y-Z plane are measured in order to obtain the Y direction. As the Is fixed points, for example, two locations (yl, yz) from the side surface of the electrode or two locations (V3.'74) from the bottom surface of the electrode are selected.

Furthermore, in order to obtain the Z rotation, the coordinates of the electrode surface on a plane parallel to the X-Y plane are measured. The measurement points are, for example, two locations on the side surface of the electrode (zl.

22) or (23, 24).

In the case of a round electrode as shown in the 41st threshold (b),
Since there is no need to take Z rotation into consideration, it is sufficient to measure the X direction and the Y direction in the same manner as in the case of the square electrode.

Furthermore, in the case of a round upper pole, the Z coordinate in the F plane parallel to the x-Z plane and the plane parallel to the Y-Z+- plane, as shown in Figure 4 (C). Two different sets of measurement points W1
~W4 and w5~wB can also be selected. Then, calculate the coordinates of the center point Wl from the coordinates of the measurement points w1 to w4, and further.

The coordinates of the center point W2 are calculated from the coordinates of the measurement points W5 to W8, and the direction of the line connecting wl and w2 is determined by calculation, from which the X direction and Y height can be determined.

The electrode coordinate measurement described above can be performed, for example, as follows.

First, the coordinate system is set so that the origin is located inside the 1-conform part. In FIG. 4(a), when measuring the X tension, the measurement point X1. For X2, 22Xl', X2 is located at an appropriate distance from the measurement point in the
The touch sensor 52 is positioned at ', and these are used as starting points for coordinate measurement of the measurement point. Also, measurement point X3. X4
, the touch sensor 52 is positioned at positions x3' and x4' separated by an appropriate distance in the Z direction from the measurement point, and these are the starting points for coordinate measurement of the measurement point. The setting is performed by teaching in advance according to the type of electrode.In llp, the above-mentioned measurement starting point for the electrode is stored as data in the CPU 60 before starting the electrode posture measurement for actual machining. For example, the X-direction slide table 102, the Y-direction slide table 104, and the Z-direction slide means 54 are manually operated to position the touch sensor 52 at the above-mentioned starting point, and the touch sensor 5 at that time is
There is a method of storing the coordinates of 2 in the CPU 60. In the case of a large electrode as shown in FIG. 4(b), instead of setting the measurement start point by manual teaching for all measurement points x1 to x4 and yt'''ya, for example, the measurement point x1.

x2. Manually teach only the measurement start point for x3, and automatically set the measurement start points for other measurement points X4, 71 to y4 from the three measurement start point coordinates set in L based on the axial symmetry of the electrode. You can also do that. Such automatic setting can be easily performed by incorporating a program into the CPU 60 in advance. Furthermore, instead of performing such manual teaching, the data of the starting point coordinates may be directly input to the CPU 60 and stored.

The above description has been made regarding the measurement of the X direction, but the same applies to the measurement of the Y direction and the Z rotation.

In the case of measurement as shown in FIG. 4(c), for example, only the measurement start point for measurement points wl, w2, and w5 is taught without moving, and the other measurement points w3,
The measurement starting points for w4, w6 to W8 are shown in Figure 4 above (
It can also be set automatically in the same way as in case b).

When the measurement starting point is set as in 1 above, it is only necessary to move the touch sensor 52 in the predetermined direction in the direction in which the absolute value of the coordinates becomes smaller when measuring the electrode coordinates. , movement control becomes easier. Furthermore, the touch sensor is moved between each measurement point, for example, along the X, Y, or Z direction so as not to collide with the electrode 124.

A flow sheet of the attitude control process as described above is shown in FIG.

That is, first, after moving the touch sensor 52 to the first measurement starting point, the coordinates of the first measurement point are measured, and the coordinates of the second and subsequent measurement points are similarly measured, and the X direction towel is measured. The coordinate measurements regarding the rotation are completed, and then the coordinate measurements regarding the Y direction orientation and Z rotation are similarly completed (step 5-1).

Posture amount calculation is performed based on the coordinates thus measured (step 5-2).

Next, the attitude state star obtained by the calculation is compared with the correct attitude state amount stored in advance in the CPU 60 as a reference (step 5-3), and if the difference is within the allowable value, Next, the process moves on to the processing process.

On the other hand, if it is outside the allowable value, the posture control bag 2142 is driven to rotate the electrode 124 at an appropriate angle around the X direction, Y direction and/or Z direction (step 5-4), Then, return to step 5-1.

Next, the details of step 3-3 will be explained.

Before moving on to actual machining, check the positional relationship between the electrode and the work; 1
, 1, and the electrode feed dimension is calculated. Figure 6 (a
) and (b) are diagrams for explaining a method of calculating the electrode feed dimension.

The results of the electrode coordinate measurement performed after the posture correction is completed in the posture control step 3-2 are used to calculate the electrode feed dimension. That is, after measuring the electrode coordinates, the posture amount is calculated based on the measured values, and if it is found to be within the allowable range in comparison with a reference value, the measured values represent the coordinates of the electrodes. Therefore, the feed dimension can be calculated from these coordinates and the position coordinates of the workpiece 110 fixed on the workbench 108.

In FIG. 6(a), a specific example of calculating the feed dimension regarding the tapered electrode 124 will be described.

First, measurement point X1. The angle θ is calculated from the difference in the X coordinate of X2. Then, the Y coordinate of the 0 point P where the X coordinate of Sada P is calculated from the angle 0, the X coordinate of the measurement point x2, and the X coordinate of the measurement point x3 is the measurement point x1.

x2. It is the same as the Y coordinate of x3, and the X coordinate of one point P is the same as the X coordinate of measurement point X3. As a result, the coordinates of point P can be determined.

On the other hand, the coordinates of the point Q on the workpiece 110 with respect to the touch sensor 52 are measured in advance (that is, when the workpiece 110 is fixed to the workbench 108). Then, attach the measuring ball so as to bring the measuring ball into contact with point Q of the workpiece 110.
X-direction slide table 102. The Y-direction slide table 104 and the Z-direction slide means 54 are driven, and then the A1 constant method is driven so as to contact the touch sensor 52, and from the amount of movement at this time, the point Q of the workpiece 110 with respect to the touch sensor 52 is determined. The coordinates of are found. Note that the coordinates of point Q may be measured by directly bringing the measuring ball into contact with point Q as described above, but as shown in FIG. It is also possible to measure the coordinates of these points by touching 2°q3 and calculate them from the coordinates.

Further, R is a point on the curved L plane formed on the workpiece corresponding to point P of the electrode 124. The relationship between point R and point Q is determined by design dimensions.

Therefore, the coordinates of point Q are determined from the coordinates of point P, the coordinates of touch sensor 52, and the relative positional relationship between the touch sensor and point Q. Based on this, the coordinates of point R are determined from the relative positional relationship between point Q and point R.

From the above, the feed dimensions in the X direction, Y direction, and Z direction for machining feed from point P to point H are calculated. The calculation of the feed size for this processing is performed by the CPU 60.

In this way, after the calculation of the machining feed modulus is completed, the electrode is moved and electrical discharge machining is performed.

Machining is not carried out all at once, but once the discharge is stopped midway, the shape of the machined part is measured, and based on the results, the relative positional relationship between the electrode 124 and the workpiece 110 is corrected as necessary, and then further processing is performed. Perform addition ■-.

FIG. 7 is a diagram for explaining an uninvented method applied to measuring the shape of such a processed part.

After the discharge is stopped, the X-direction slide table of the rotary machining machine is moved to bring the electrode 124 into contact with the machining surface of the workpiece 110, and the amount of movement at this time is the X-direction between the electrode 124 and the workpiece 11o when the discharge is stopped. Obtain the gap distance #, X1. In addition, the Z-direction sliding means of the load-loading machine is moved from the electrode position at the time of discharge stop to bring the electrode 124 into contact with the machined surface of the workpiece 110, and as movement h1 at this time, the electrode position at the time of load-load stop F is moved. The gap distance Z1 in the X direction between 124 and the workpiece 110 is obtained.

Since the coordinates of the surface of the electrode 124 have already been obtained in the attitude control step 3-2, the coordinates of the point P are known.

Therefore, the distance @X1. obtained as above. Z1 and point P
It is possible to calculate the coordinates of a point r on the processed portion at the present time, which corresponds to the point P on the electrode 124, by calculation from the coordinates and the shape of the electrode.

On the other hand, design 1. The exact final addition surface of IE is shown in dotted lines in FIG. Electrode 12 on this final processed surface
The coordinates of the point H corresponding to the point P of No. 4 have already been determined at the time of calculating the feed dimension described above.

Therefore, by comparing the coordinates of point r and point H, it is possible to set the moving direction and moving needle of the electric J4i124 when discharging again, and based on this, a more accurate shape of the machined part can be determined. Obtainable.

In the above process, when measuring the gap distance, electric J4i
It is possible to use a method of detecting contact by applying a measurement voltage that is extremely low compared to the voltage for electric discharge machining between the workpiece 124 and the workpiece 110 and detecting the current that flows when the two contact each other. .

Although the explanation has been given below in the X-Z plane, the same applies to the Y-Z plane.

In addition, in the north, the shape of the machined part was measured at one point P in the x-Z plane, but depending on the shape of the machined part, the shape of the machined part was measured at a point on the opposite side of point P in the x-Z plane. Shape measurements may also be performed.

Such shape measurement of the processed portion can be patterned depending on the shape of the processed portion. The pattern of the processed portion shape is shown in FIGS. 8(a) to 8(d), and these figures show a plan view and a longitudinal cross-sectional view, respectively.

FIG. 8(a) shows a pattern of a processed part shape similar to that shown in FIG. 7, and the shape can be measured by movement in one direction shown by the arrow in the horizontal plane and movement in the vertical direction.

FIG. 8(b) shows a pattern in which shape measurement is performed by movement in two directions indicated by arrows in the horizontal plane and movement in the vertical direction.

FIG. 8(C) shows a pattern in which shape measurement is performed by movement in three directions indicated by arrows in the horizontal plane and movement in the vertical direction.

FIG. 8(d) shows a pattern in which shape measurement is performed by movement in four directions indicated by arrows in the horizontal plane and movement in the vertical direction.

By storing the direction of movement during shape measurement in the Y-me CPU 60 for each pattern of the processed portion, movement is automatically performed during shape measurement.

By repeating the above addition and shape measurement an appropriate number of times, a more accurate shape can be obtained.

Furthermore, when measuring the shape of the machined part, it can be set so that correction processing is performed again only when the shape of the machined part is outside the tolerance, and the weighting is completed when the shape of the machined part is within the tolerance. .

FIG. 9 shows a detailed flow sheet of the overall configuration of an embodiment including the method for measuring the shape of a machined part according to the present invention as described above.

FIG. 10 shows a flow sheet of another embodiment of the above-mentioned Kanji system.

In this embodiment, if there are n or more cases in which the attitude amount obtained in the attitude amount calculation step for the same electrode is outside the allowable value, no further attitude correction is performed for the electrode. Next, the process moves to the electrode replacement process.

As a result, it is possible to move on to processing using the next electrode without attempting long-term attitude control for an electrode whose attitude cannot be controlled satisfactorily for some reason.

Furthermore, in this embodiment, when moving to the electrode replacement process due to a posture correction failure, a related electrode bus command is issued.

The related electrode buses will be explained below.

Figure 11 shows a plurality of workpieces 1 fixed on the workbench 10B.
10 and 111. FIG. Work 110 is processing section A
, B, C, D, and E, and the workpiece 111 has machining parts E and F.
has. These processed parts A to F are each provided with an electrode 124a.
Processed by ~124f. The machining of the machined part B by the ``ill pole 124b is carried out after the machining of the machined part A by the electrode 124a, and further the machining @C by the electrode 124C.
The processing is performed after the processing of the processing portion B by the electrode 124b.

Therefore, if the machining part A is not machined due to a defective attitude correction of the electrode 124a.

After that, addition [parts B and C cannot be performed.
In such a case, the electrode 124b that should process the processing parts B and C
, 124c is also preferably not installed in the electrical discharge machine.

Therefore, when the electrodes related to the related machining parts belonging to the same block are bussed, the electrodes related to the machining parts belonging to the same block are also bused from now on. Such busing of related electrodes can be performed by software of the CPU 60 by attaching a code to each electrode. ”-Memory 11 Work 110 as shown in Figure. il
When machining 1, for example, the following code is attached to each electrode, and the machining E system is controlled by this code.

? -Polar code 124a 110-A-1 124b 110-A-2 124c 110-A-3 124d, 110-D-1L24e
110-E-1124e
1 1 1-E-1124f 111
-F-1 Here, the first number in the code indicates the type of workpiece to be processed by the electrode, the next code indicates the type of processing block, and the last number indicates the type of workpiece to be processed by the electrode. The electrode 12 indicates the processing order of the processing section.
The electrode may have two or more codes, as shown in 4e with two codes, when the same electrode is used to process two or more locations E.

Therefore, when, for example, the electrode 124a is passed due to a defective posture correction, the electrode 124b having the code A of the same processing section block type. At 124C, a command that will be passed from now on is issued and stored. Then, in the electrode exchange step 3-1, before executing the electrode exchange, it is confirmed whether or not the electrode to be newly attached is the one for which a pass command has been given, and if it is the one for which a pass command has been given. Immediately move on to the next electrode in the order of addition.

In the embodiment 1- above, a touch sensor is used as the first stage of electrode coordinate measurement, but a method using electrical conduction or a non-contact method may be used instead.

Although the following embodiments are explained with reference to electric discharge machining, the present invention can be similarly applied to general machining in which tools or workpieces are replaced other than electric discharge pressurization. It is possible.

[Effects of the Invention] According to the method for measuring the shape of a machined part of the present invention, tools are automatically exchanged and multiple types of machining are performed unattended using the i! It is possible to construct a system that performs systematically and with great accuracy.

Furthermore, in the method for measuring the shape of a machined part according to the present invention, the gap distance between the tool and the workpiece can be calculated when measuring the shape of the machined part using the tool coordinates measured for posture control, so that setup can be carried out efficiently. .

Processing can be completed in a short time.

Furthermore, in the present invention, the shape δ of the machined part is kept constant by bringing the tool directly used for processing into contact with the machined part, so no matter what shape the machined part has, the shape can be measured extremely accurately. It has the great advantage of being able to

[Brief explanation of the drawing]

Figure i1 is a configuration diagram of the electric discharge machine. FIG. 2 is a block diagram of the control system of the electrical discharge machine. FIG. 3 is a flow sheet of a crab system to which the method for measuring the shape of a machined part according to the present invention is applied. Figures 4(a), (b), and (C) are partial perspective views of the pole. FIG. 5 is a flow sheet of the attitude control process. 614(a) and 614(b) are diagrams for explaining processing feed method calculation. FIG. 7 is a diagram for explaining the measurement of the shape of the processed part. El'S8 Figures (a) to (d) are diagrams showing patterns of the shape of the processed portion. FIG. 9 and FIG. 10 are flow sheets of the Kanji system including the method for measuring the shape of a machined part according to the present invention. FIG. 11 is a diagram showing a processing section of a workpiece. FIG. 12 is a schematic diagram of a conventional electric discharge machine. 42: Posture control device 50: Electrode holder 52: Touch sensor 102: X-direction slide table LO4 + Y-direction slide table 108: Workbench 110.111: Workpiece 124: Electrode agent Patent attorney Jo Taira Yamashita Figure 2 Figure 4 ( 0) Figure 4 (b) Figure 5 Figure 6 (b) Figure 7 Figure 8 (a) (b) (C) (d) Figure 7 Figure 10 Figure 1 Figure ii

Claims (1)

[Claims] (1) In a method of measuring the shape of a machined part of a workpiece machined by a tool, the coordinates of one or more predetermined points on the tool are measured in advance, and the tool is moved relative to the workpiece. The gap distance between the tool and the workpiece in the movement direction is measured by the amount of movement of the tool at this time by contacting the machining surface, and the one or more gap distances thus measured, the coordinates of the tool predetermined point, and the tool shape. A method for measuring the shape of a machined part of a workpiece in a processing machine, characterized in that the coordinates of a point on a machined part corresponding to the predetermined point of the tool are calculated from .