JPH0248124A - Nc electric discharge machining method - Google Patents

Abstract

PURPOSE:To make it possible to produce each program corresponding to variable conditions in electric discharge machining before the electric discharge machining is performed by reading the internal data of an NC device during the execution of an NC program, and substituting the read data into a compensation term. CONSTITUTION:Electric discharge machining is started according to an NC program (S1). If any error is not generated during the machining (S2), the machining is further continued. If an error such as an arc or the like is generated, whether an M03 function is on or off is judged (S3). If the M03 function is on, whether the program at that time is completed or uncompleted is judged (S4). When the program is uncompleted, an M03 code is searched for (S5). When the code is discovered, the internal data of an NC device is read (S6). Then the stop condition of the NC device, which is stored in the internal data, is read in S7, so as to be saved (substituted) in a compensation term of a number ** *. And the contents of the error which has caused the stop of the electric discharge machining are distinguished (S8). Then a stop processing is conducted and the following step is available.

Description

[Detailed description of the invention] [Field of use of industry 1-O] The present invention relates to an NC electrical discharge machining method.

[Prior Art] A conventional NC electric discharge machining apparatus can read current coordinates, cumulative machining time, etc. from an NC device while executing an NC program. This allows an overview of the current machining status to be grasped.

[Problems to be Solved by the Invention] However, in the conventional apparatus described above, when the NC device is stopped due to some error, it is impossible to restore the original state and continue the subsequent processing. Therefore, there is a problem in automating electrical discharge machining.

SUMMARY OF THE INVENTION An object of the present invention is to provide an NC electrical discharge machining method that can create programs corresponding to various conditions in electrical discharge machining before electrical discharge machining.

[Solving the Problem] The present invention reads internal data of an NC device while executing an NC program, and substitutes the read data into a correction term.

[Operation] The present invention reads the internal data of the NC device while executing the NC program, and substitutes the read data into the correction term, so that the program corresponding to various conditions in electrical discharge machining can be programmed before electrical discharge machining. This allows further automation of electrical discharge machining.

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

First, start the electrical discharge machining according to the NC program.
), if no errors such as arcs occur during machining (
S2), the processing is further continued. The above-mentioned errors include errors such as limit sensing, contact sensing, etc. in addition to arcing.

If the above-mentioned error such as arcing occurs, it is determined whether the MO3 function is on or off (S3). In the NC electric discharge machining method for die-sinking, for example, when an arc occurs, the MO3 function is a function that interrupts the machining, jumps to the MO3 code on the program, and executes the program from the next MO3 code.

If the MO3 function is on, it is determined whether the program at that time is finished or not (S4).
If the program has not been completed (if there are still operations to be processed), the MO3 code is found (S5).

If the MO3 code is found, the internal data of the NC device is read (S6). The internal data of this NC device is 1
Block machining time, NC device stop state data,
These include the machining start coordinate value, the servo state during machining (the number of times machining was performed when the servo voltage exceeded a predetermined value), and the like.

In the above embodiment, the G33S code is then executed (S7). The G83 code is a JIS code that writes the current value and cumulative machining time into the designated correction term, but the G33S code is not a JIS code, but is an expanded version of the G83 code. That is, in S7, the stop state of the NC device is read from the internal data, and the read stop state is written (substituted) into the correction term of the number tree. That is, the G33S code is defined as a command to add a number shown in a block after G33S, and to write the read internal data into the correction term of the number block.

The content of the error that caused the electric discharge machining to stop is determined (S8). If the machining was stopped due to contact detection, contact detection stop processing is performed (S9). If the machining was stopped due to limit detection, limit stop processing is performed. (S10), and if arc is generated and machining is stopped, arc stop processing is performed (S11) and the process proceeds to the next step.

In the above embodiment, by reading the internal data of the NC device and substituting the read internal data into the correction term, each process is then performed according to the error content, and the next processing is performed without stopping the processing. step, thus making it easier to automate electrical discharge machining.

In addition, in S3, if the MO3 function is off, the AC
Waits for K and displays a fatal error message (S2
1). Also, if the program has ended when the MO3 function is on (S4), it will wait for ACK and the MO3 function will be turned on.
3 is not found (S22).

In addition, the MO3 function in the above embodiment is for die engraving, but the MO3 function in wire car/ ) electric discharge machining is
3 functions (If you cannot connect after trying to connect a specified number of times,
The same explanation as above can be applied to the case of a machine section that interrupts the program being executed, jumps to the MO3 code, and starts execution from the next MO3 code.

In the above embodiment, the case where an error such as contact detection, limit detection, arc, etc. occurs has been explained. If you find that the coordinates are the same as the starting coordinates, you can understand that the machining is not progressing (
(This is also a type of error.) In this case, the discharge conditions can be changed depending on the material of the workpiece at that time. This case is also an example in which internal data can be substituted into the correction term, and the subsequent branching state of the program can be set (changed) before machining according to the substituted internal data.

[Effects of the Invention] According to the present invention, programs corresponding to various conditions in electrical discharge machining can be created before electrical discharge machining, and the automation of electrical discharge machining is further improved.

[Brief explanation of the drawing]

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

Claims (2)

[Claims] (1) An NC electrical discharge machining method characterized by reading internal data of an NC device while executing an NC program, and substituting the read data into a correction term. (2) Claim (1), characterized in that the internal data is data indicating at least one of one block machining time, a stop state of the NC device, a machining start coordinate value, and a servo state during machining. NC electrical discharge machining method.