JPH04315522A - Positioning method and device for electric discharge machining device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for positioning an electrode in an electric discharge machine.

0002

2. Description of the Related Art FIG. 7 is a block diagram showing the configuration of an apparatus for implementing a conventional positioning method of this type. In the figure, 1 is a CPU, 2 is a memory that stores control programs, NC programs, etc., 3 is a display interface, 4 is a keyboard interface, 5 is a machine and power input/output interface, 6 is a drive system interface, and 7 is an external input/output 8 is a CRT, 9 is a keyboard, 10 is a mechanical and power supply contact, 11 is a servo amplifier and servo motor, and 12 is an external device such as an FLD or RS-232C.

Next, the positioning operation will be explained. FIG. 8 is a diagram showing this positioning operation, in which the electrode 21 attached to the Z axis (not shown) is positioned at the center of the work 20 placed on the XY table (not shown). Generally, in such a case, the NC program is input and executed from the keyboard 9 or external device 12 in FIG. The NC program is as follows. G31X50.0Y40.0Z10.0; Here, 50.0 of
is the amount y that the electrode 21 moves to position the surface in the Y-axis direction. Further, Z10.0 is the amount z by which the Z-axis moves in order to position the plane in the X-axis direction and the plane in the Y-axis direction.

[0004] The specific operation is as follows. 1. The electrode 21 descends to position the Z surface (upper surface) and end surface of the workpiece 20. 2. The electrode 21 is relatively raised by 5 mm (the amount of movement preset in the control device). 3. The electrode 21 moves 50 mm in the + direction of the X axis. 4. Move 10mm in the Z-axis direction. 5. Perform end face positioning in the X-axis direction. 6. Move in the + direction of the X axis, 5. Return to the position where end face positioning started. 7. Move 10mm in the Z-axis + direction. 8. Move 100mm (twice 50mm) in the X-axis direction. 9. Move 10mm in the Z-axis direction. 10. Perform end face positioning in the + direction of the X axis. 11. Move in the X-axis direction; 10. Return to the position where end face positioning started. 12. Move 10mm in the Z-axis + direction. 13. The X-axis is moved to the center position between the position where the end face is positioned in the + direction of the X-axis and the position where the end face is positioned in the - direction of the X-axis. 14. Move 40mm in the Y-axis + direction. 15. Move 10mm in the Z-axis direction. 16. Perform end face positioning in the Y-axis direction. 17. Move in the Y-axis + direction, 16. Return to the position where end face positioning started. 18. Move 10mm in the Z-axis + direction. 19. Move 80mm (twice 40mm) in the Y-axis direction. 20. Move 10mm in the Z-axis direction. 21. Perform end face positioning in the Y-axis + direction. 22. Move in the Y-axis direction, 21. Return to the position where end face positioning started. 23. Move 10mm in the Z-axis + direction. 24. The Y-axis is moved to the center position between the position where the end face is positioned in the Y-axis + direction and the position where the end face is positioned in the Y-axis - direction. 25. As a result of the above, the electrode 21 is located at the center of the workpiece 20.

[0005]

[Problem to be solved by the invention] Since the conventional positioning method is configured as described above, it is necessary to specify the amount of X-axis movement x, the Y-axis movement amount y, and the Z-axis movement amount z. In addition, unless there was a sufficient amount of movement, it was not possible to position the end face in the X-axis direction or Y-axis direction. Furthermore, if an excessively large amount of movement is specified, there is a waste of time required for end face positioning.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a positioning method and apparatus that do not require specifying the movement amounts x and y during positioning.

[0007]

[Means for Solving the Problems] In order to achieve the above object, a positioning method in an electric discharge machining apparatus according to the present invention moves the X-axis or the Y-axis by a preset constant movement amount, and moves the Z-axis each time. The end face is positioned in the axial direction, and this Z
Repeat the operation of positioning the end face of the axis until the amount of movement in the Z-axis direction exceeds a certain amount, and then move the X-axis or Y-axis to the position where the end face of the workpiece can be positioned in the X-axis direction or Y-axis direction. is moved, and then the end face positioning of the X-axis direction surface or Y-axis direction surface of the workpiece is performed.

Further, the positioning device in the electric discharge machining apparatus according to the present invention includes means for moving the workpiece and the electrode in three-dimensional orthogonal axes directions to position the end face, and means for moving the electrode by a certain amount in each axis direction. A memory for storing data in each axis direction, a means for completing end face positioning of the Z axis when the amount of movement during positioning of the end face of the Z axis exceeds a certain amount, and a memory for storing the certain amount. It is equipped with the following.

[0009]

[Operation] In the present invention, the X-axis and Y-axis are moved by a fixed amount regardless of the size of the workpiece, and by positioning the end face in the Z-axis direction each time, the X-axis of the workpiece is Search for a position where end face positioning of the plane in the direction or the plane in the Y-axis direction can be performed. The end face positioning in the Z-axis direction is performed by terminating the end face positioning when contact between the electrode and the workpiece is not detected even after moving by a preset amount, thereby positioning the electrode at the end of the workpiece. Detect that. Thereafter, end face positioning of the X-axis direction surface or Y-axis direction surface of the workpiece is performed.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a memory in a control device according to an embodiment of the present invention, showing the structure of memory 2 in FIG. In the figure, 30 is a memory that stores the control program of this device, 31 is a data memory necessary to execute the control program, 32 is a memory that stores the NC program, and 33 is a device that raises the Z-axis after positioning the Z-axis end face. 34 is the amount of movement in the X-axis direction to find a position where the end face of the surface in the X-axis direction can be positioned;
35 is the amount of movement in the Y-axis direction to search for a position where the end face of the surface in the Y-axis direction can be positioned, and 36 is the amount of movement for Z-axis end face detection to find the position where the end face of the surface in the X-axis and Y-axis directions can be positioned. It is.

The following operation will be explained. The Z-axis rise amount 33, the X-axis direction movement amount 34, the Y-axis direction movement amount 35, and the Z-axis end face detection movement amount 36 in FIG. 1 are entered from the keyboard 9 in FIG. Next, a program for automatic positioning is executed. Detailed processing flowcharts are shown in FIGS. 2 to 5. Step 1: Position the end face of the Z axis. Step 2: Move the Z-axis by the pre-input Z-axis rise amount of 33 minutes. Step 3: Move the X-axis in the + direction of the X-axis by the previously input X-axis direction movement amount of 34. Step 4: Perform end face positioning on the Z axis again. Step 5: Check whether the robot has moved by the pre-input Z-axis end face detection movement amount of 36. If it is moving, it is determined that it is in a position where end face positioning of the surface in the X-axis direction can be performed, and the process moves to step 7. If it has not moved, proceed to step 6. Step 6: Check whether Z-axis end face positioning is completed. If completed, move on to step 2 and repeat the above steps. If it is not completed, move on to step 5. Step 7: Position the end face in the negative direction of the X axis. Step 8: The position where the X-axis end face positioning has been completed is
Remember it as 1. Step 9: Move to the position where end face positioning on the X axis started. Step 10: Move in the + direction of the Z-axis by a Z-axis end face detection movement amount of 36 minutes. Step 11: Move the X-axis in the negative direction of the X-axis by the previously input X-axis end face movement amount of 34. Step 12: Perform end face positioning on the Z axis. Step 13: Pre-input Z-axis end face detection movement amount 3
Check if you have moved by 6 minutes. If it is moving, it is determined that it is in a position where end face positioning of the surface in the X-axis direction can be performed, and the process moves to step 16. If it has not moved, proceed to step 14. Step 14: Check whether Z-axis end face positioning is completed. If it has been completed, in step 15 the Z-axis is moved by the Z-axis rise amount of 33 minutes, the process moves to step 11, and the above steps are repeated. If it has not been completed, proceed to step 13 for checking. Step 16: Perform end face positioning in the + direction of the X axis. Step 17: Set the position where the X-axis end face positioning is completed by x2
Remember it as. Step 18: Move to the position where end face positioning on the X axis is started. Step 19: Move in the + direction of the Z-axis by the amount of movement for Z-axis end face detection of 36. Step 20: Move the X-axis to the position of (x1 +x2)/2. From step 21 to step 39, the same operation as the above-mentioned X-axis operation is performed regarding the Y-axis. FIG. 6 shows the above operations from step 1 to step 8 in terms of the relationship between the workpiece 20 and the electrode 21.

[0012] In the above embodiment, the Z-axis rise amount 33,
Although the X-axis direction movement amount 34, the Y-axis direction movement amount 35, and the Z-axis end face detection movement amount 36 were set in advance from the keyboard 9, N
It may also be set using a C program. Further, in the above embodiment, the positioning is performed for the center position of the column of the workpiece, but automatic positioning (for example, corner positioning, etc.) in which the amount of movement is specified in the conventional device may also be used.

[0013]

As described above, according to the present invention, it is not necessary to always specify the amount of X-axis movement, Y-axis movement, and Z-axis movement during automatic positioning, and automatic positioning can continue even if a program error occurs. This can prevent the inconvenience of not being able to do so.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a memory according to an embodiment of the present invention.

[Fig. 2] Flowchart showing the positioning operation of the embodiment (
Part 1).

FIG. 3 is a flowchart (Part 2).

FIG. 4 is a flowchart (part 3) as well.

FIG. 5 is a flowchart (part 4) as well.

FIG. 6 is a diagram showing the positioning operation of the embodiment in terms of the relationship between a workpiece and an electrode.

FIG. 7 is a configuration diagram of a device that implements a conventional positioning method.

FIG. 8 is a diagram showing a conventional positioning operation in terms of the relationship between a workpiece and an electrode.

[Explanation of symbols]

1 CPU 2 Memory for storing control programs, NC programs, etc. 3 Display interface 4 Keyboard interface 5 Machine and power input/output interface 6 Drive system interface keyboard 7 External input/output interface 8 CRT machine and power contacts 9 Keyboard servo interface 10 Machine and power supply Contact 11 Servo amplifier and servo motor 12 External equipment 20 Work 21 Electrode 30 Control program 31 Control program data 32 NC program 33 Z-axis rise amount 34 X-axis movement amount 35 Y-axis movement amount 36 Z-axis end face detection movement amount

Claims (2)

[Claims] [Claim 1] The X-axis or the Y-axis is moved by a preset constant movement amount, and each time the electrode is moved in the Z-axis direction by a preset constant movement amount to position the top surface and end face of the workpiece. , Repeat the operation of positioning the end face of the Z axis until the amount of movement during positioning of the end face of the Z axis exceeds a certain amount,
When the amount of movement during positioning of the end face of the Z-axis exceeds the above-mentioned certain amount, positioning of the end face of the Z-axis is considered complete, and then the X of the workpiece is
A positioning method in an electric discharge machining apparatus, characterized in that end face positioning of an axial surface or a Y-axis direction surface is performed. 2. Means for positioning the end face of a workpiece and an electrode, a memory for storing data for moving the electrode a certain amount in the Z-axis direction, and a memory for storing data for moving the electrode a certain amount in the X-axis direction. A memory for storing data, a memory for storing data for moving the electrode by a certain amount in the Y-axis direction, and a memory for storing data for moving the electrode by a certain amount in the Y-axis direction, and a memory for storing the data for moving the electrode in the Y-axis direction; A positioning device in an electrical discharge machining machine, comprising means for completing the process, and a memory for storing the certain amount.