JPH0248125A - Nc electric discharge machining method - Google Patents

Abstract

PURPOSE:To promote the automatization of the electric discharge machining in the title by stopping and moving an electrode when the electrode contacts a work or when its limit stop is performed, and jumping a program to a prescribed block in an NC program so as to perform the said NC program. CONSTITUTION:A prescribed electric discharge machining is carried out (S1). When limit sensing is performed on the way of the machining to cancel the machining (S2), whether an M03 function corresponding to its error is on or off is detected (S3). When the corresponding M03 function is on, a cursor on a screen goes down (S4) so as to try to find an M03 code (S5). When the M03 code is discovered, a program is executed again from a block after the M03 code (an order group in the program) (S6). This procedure results in the normal performance of the following machining even if the machining is canceled because of the limit sensing. Also, the automatization of the electric discharge machining concerned can be further promoted.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an NC electrical discharge machining method.

[Prior Art] When a conventional NC electrical discharge machining device executes an NC program, there are cases where the electrode comes into contact with the workpiece or senses a limit during machining due to a teaching error or a programming error. be.

Since the above-mentioned contact sensing and limit sensing are serious errors, execution of the NC program is stopped at that point.

[Problems to be Solved by the Invention] In the conventional apparatus described above, there is a problem in that if the execution of the NC program is stopped when contact sensing or limit sensing is performed, there is a large waste from the point of view of automation of processing.

The present invention originally includes contact sensing, limit sensing, etc.
It is an object of the present invention to provide an NC electric discharge machining method that can further advance automation by performing normal machining even if an error that should not occur occurs.

[Means for Solving the Problems] The present invention stops movement when the electrode of the electrical discharge machining device contacts the workpiece or reaches a limit stop.
The NC program is executed by jumping to a specified block in the C program.

[Function] The present invention stops movement when the electrode of the electrical discharge machining device comes into contact with the workpiece or reaches a limit stop.
Since the above NC program is executed by jumping to the specified block in the C program, even if an error that should not occur in the first place, such as contact sensing or limit sensing, occurs, normal machining can be performed afterwards.
Further automation is possible.

[Example] FIG. 1 is a flowchart showing an example of the present invention.

First, a predetermined electrical discharge machining is performed (31), and if a limit is detected during the machining and the machining is stopped (S2), it is detected whether the MO3 function corresponding to the error is on or off. (S3).

Here, the MO3 function, in a die-sinking electrical discharge machine, interrupts the machining when contact, limit, or arc is detected, jumps to the MO3 code, and
This is a function that executes the program from the next code. In addition, in wire cut electric discharge machining equipment, the MO3 function is
This is a function that interrupts the currently running program and executes the program starting from the MO3 code if the connection fails after a predetermined number of attempts.

If the corresponding MO3 function is on (S3), after machining stops due to limit sensing, the cursor on the display device will move down on that display device (S4), MO3
An attempt is made to discover the code (S5).

If the MO3 code is found, execution of the program is resumed from the next block (a group of instructions in the program) after the MO3 code (S6).

In this way, even if a limit is sensed and machining is stopped, subsequent machining can be performed normally, and automation of electric discharge machining can be further advanced.

Note that if the corresponding MO3 function is off (S3), execution of the program is stopped and the program waits for ACK (S7). In this case, the position of the cursor remains as it was when the error occurred. Further, if the M03 code is not found (S5), and the MO2 code is found (sg), the program execution is stopped and the program waits for ACK (S9). In this case, the cursor returns to the position it was in when the error occurred.

In the above example, we took the machining stop due to limit detection as an example of an error that should never occur.
The same explanation as above can be given to the case where the machining is stopped due to contact sensing instead of the machining stopped due to limit sensing.

Note that the MO2 code is an end-of-program code, indicating the end of the main program, and does not execute programs written after the MO2 code.

[Effects of the Invention] According to the present invention, even if an error that should not occur in the first place, such as contact sensing or limit sensing, occurs, normal machining can be performed thereafter, thereby further automating electric discharge machining. It has the effect of being able to do it.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing one embodiment of the present invention.

Claims (1)

[Claims] An NC electrical discharge machining method characterized in that when an electrode of an electrical discharge machining device contacts a workpiece or reaches a limit stop, movement is stopped, jumps to a designated block in an NC program, and the NC program is executed.