JPH04105823A - Control device for electric discharging - Google Patents

Abstract

PURPOSE:To predict a work completion time from a work progressing state changed every moment, by calculating the approximate curve of a work actual result curve drawn from the work start time, and predicting the work finish time with the time until reaching the work depth commanded in the approximate curve being found. CONSTITUTION:A calculation device 6 calculates the working depth at the time from the command value of a command device 4, during the process of a work 2, the calculation value thereof is stored in a memory 7, the work actual result curve 15 from the work start time is prepared, from the work depth stored in the memory 7 and the time measured by a timer 8, in a preparation device 9, and this is displayed on the scope of a CRT 12 as a work actual result graph. Simultaneously with this the approximate curve corresponding to the work actual result curve prepared by the preparation device 9 is calculated in a calculation device 10, a work completion prediction time is found and displayed on the scope of the CRT 12. Thus, the prediction of the work completion time becomes easy, because of the work completion predicting time corresponding to the work progress state being displayed, during the work processing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrical discharge machining control device that predicts a machining end time in electrical discharge machining.

[Prior Art] FIG. 5 is a block diagram showing the configuration of a conventional electrical discharge machining control device. In the figure, 1 is an electrode, 2 is a workpiece (workpiece), 3 is a motor for moving the electrode 1, and 4 is an NC
A command device analyzes the block diagram and issues a command to the motor 3 to the machining depth commanded by the NC program while monitoring the state of the gap between the electrode 1 and the workpiece 2; 6 is a pole monitored by the command device 4; 7 is a memory that stores the machining depth calculated by the calculation device 6, and 8 measures the time from the start of machining. A timer 9 is a creation device for creating a machining performance curve from the machining depth stored in the memory 7 and the time measured by the timer 8; 12 is a creation device for displaying a machining performance club including the machining performance curve calculated by the creation device 9; C
RT (cathode ray tube).

FIG. 6 is a diagram showing a machining result graph displayed on the CRT in the electric discharge machining control device of FIG. 5, and shows a machining result graph with time t on the horizontal axis and machining depth l on the vertical axis. There is. In the figure, 15 is a machining performance curve created by the creation device 9.

Next, the operation of the conventional electric discharge machining control device described above will be explained. A voltage is applied between electrode 1 and work 2, and electrode 1
Work 2 due to the discharge phenomenon occurring between the poles of
When machining is started, the command device 4 analyzes the NC program, calculates the commanded machining depth, stores the calculated value in the memory 7, and records the state between the electrode 1 and the workpiece 2. Outputs a command according to the motor 3, and at this time,
The timer 8 starts counting to measure the time from the start of machining. During machining of the workpiece 2, the calculation device 6 calculates the machining depth at that point from the command value of the command device 4, and stores the calculated value in the memory 7.
Create a machining performance curve 15 from the start of machining from the machining depth stored in and the time measured by the timer 8,
This is displayed on the screen of the CRT 12 as a machining result graph.

[Problems to be Solved by the Invention] Since the conventional electric discharge machining control device described above is configured as described above, when machining of the workpiece 2 is started, the machining results from the start of machining are controlled by the creating device 9. A curve 15 is created and displayed as a machining result graph on the CRT 12, but this machining result graph merely shows the progress of machining.In particular, during machining workpiece 2, the machining speed changes depending on the machining depth, etc. In electrical discharge machining, where machining conditions change due to changes in
There was a problem in that it was very difficult to predict the finishing time of machining 7-ri 2.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an electric discharge machining control device that can predict machining completion time from the constantly changing machining progress state.

[Means for Solving the Problems] The electric discharge machining control device according to the present invention measures the time from the start of machining using a timer, detects the machining depth of the electrode with respect to the workpiece using a detection device, and calculates the time measured by the timer. A first calculation device calculates an approximated curve of a machining performance curve representing the machining depth by the detection device, and a second calculation device calculates a predicted machining completion time from the thus calculated approximated curve, It is designed to predict the machining completion time for machining.

[Function] The electric discharge machining control device of the present invention is equipped with a machining end time prediction/measuring device, and using this device, machining is performed at any time by calculating an approximate curve of a machining performance curve drawn from the start of machining. , the time required to reach the commanded machining depth on the approximate curve is determined, and the machining end time of the machining is predicted.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram showing the configuration of an electrical discharge machining control device according to an embodiment of the present invention. In the figure, 1 is an electrode, 2 is a workpiece (workpiece), 3 is a motor for moving electrode 1, and 4 is a motor that analyzes the NC program and analyzes the state of the gap between electrode 1 and workpiece 2. a command device that monitors and issues commands to the motor 3 to the machining depth commanded by the NC program;
5 is a memory for storing the machining depth commanded by the NC program; 6 is a calculation device that calculates the machining depth from the command output to the motor 3 according to the state of the gap monitored by the command device 4; and 7 is a memory for storing the machining depth commanded by the NC program. A memory 8 stores the machining depth calculated by the calculation device 6, a timer 8 measures time from the start of machining, and 9 creates a machining performance curve from the machining depth stored in the memory 7 and the time measured by the timer 8. 10 is a calculation device that calculates the n-th approximated curve of the machining performance curve created by the creation device 9; 11 is a calculation device that calculates the approximate curve calculated by the calculation device 10 and the machining depth stored in the memory 7; A calculation device for calculating the expected completion time; 12 is a CRT for displaying the machining actual curve created by the creation device 9, the approximate curve calculated by the calculation device 10, and the predicted machining completion time calculated by the calculation device 11; (Cathode ray tube), 17 is a memory that stores the approximate curve calculated by the calculation device 10.

Figures 2, 3, and 4 are diagrams showing machining performance graphs displayed on CR' in the electric discharge machining control device of Figure 1, with time as the horizontal axis and machining depth 1 as the horizontal axis. A machining results graph is shown on the vertical axis.

In FIG. 2, 13 is a display section for displaying the machining depth according to the command stored in the memory 5, and 14 is a calculation device 1.
1 is a display section for displaying the predicted machining completion time calculated in step 1; 15 is a machining performance curve created by creation device 9; 16
is an approximate curve calculated by the calculation device 1o. Also the third
In the figure, the commanded machining (depth is L),
Machining performance curve plj p2 at times t1 and t2
and the respective approximate curves qll92 and predicted machining completion time TI.

It shows T2. Moreover, in FIG. 4, when machining is continued from the state shown in FIG. 3, the machining performance curve p at time t4 when the machining conditions are changed at time t3.
4, an approximate curve q4, and a predicted machining completion time T4.

Next, the operation of the electric discharge machining control apparatus according to the embodiment of the present invention will be explained. When a voltage is applied between the electrode 1 and the workpiece 2 and machining of the workpiece 2 is started due to a discharge phenomenon occurring between the electrode 1 and the workpiece 2, the command device 4 analyzes the NC program and issues commands. The calculated machining depth is calculated and stored in the memory 5, and a command corresponding to the state between the electrode 1 and the workpiece 2 is output to the motor 3. At this time, the timer 8 starts machining. Start counting to measure time from the start. During machining of the workpiece 2, the calculation device 6 calculates the machining depth at that point from the command value of the command device 4, stores the calculated value in the memory 7, and the creation device 9 uses the machining depth stored in the memory 7. A machining performance curve 15 from the start of machining is created from the time measured by the timer 8 and the time measured by the timer 8, and this is displayed on a CRT as a machining performance graph.
12 screens (see Figure 2). At the same time, the calculation device 10 uses the following formula (
n-th approximation curve 16 corresponding to the machining performance curve 15 shown in 201). 1 = an"t'+an-1" jn '+=...=
+ae・t”−・・・・・・・・・・ (201) is calculated and displayed on the screen -1- of CR'12, and the calculation device 11 calculates the commanded machining depth as L. The curve shown by the following formula (202) when 1=L ・・・・・・・・・・・・・・・ (
202) and the above-mentioned approximate curve 16 is determined and set as the predicted machining completion time, which is displayed on the screen of the CRT 12 (see FIGS. 3(a) and 3(b)). However, when the machining conditions are changed during machining of the workpiece 2, the calculation device 10 stores the storage time in the memory 17 and the time measured by the timer 8, and thereafter calculates the approximate curve 201 based on the machining results. An approximated curve of only the portion of the curve after the storage time of the memory 17 is calculated and displayed on the screen of the CRT 12 (see FIG. 4).

In addition, in the above example, the approximation of the machining performance curve is shown in the case where the machining performance curve is approximated from the origin or from the point where the machining conditions have recently been changed. It is also possible to approximate the machining performance curve up to a time that goes back in time, and the same effect as in the above embodiment can be obtained.

[Effects of the Invention] As described above, the electric discharge machining control device of the present invention has the following advantages:
The time from the start of machining is measured by a timer, the machining depth of the electrode relative to the workpiece is detected by a detection device, and an approximated curve of a machining performance curve representing the machining depth by the detection device against the time measured by the timer is first calculated. The predicted machining end time is calculated by the second calculation device from the approximate curve calculated in this way, and the machining end time for machining is predicted. Since the predicted machining completion time is displayed according to the machining progress status, it is easy to predict the machining completion time, and it is also possible to easily respond to changes in machining speed due to changes in machining conditions. It has excellent effects such as being able to be used as an indicator for changing processing conditions.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an electrical discharge machining control device that is an embodiment of the present invention, and FIGS.
Fig. 5 is a block diagram showing the configuration of a conventional electrical discharge machining control device, and Fig. 6 is a diagram showing a machining result graph displayed on a CRT in the electrical discharge machining control device shown in Fig. 5. , is a diagram showing a machining result graph displayed on a CRT. In the figure, 1...electrode, 2...-work (workpiece), 3...-motor, 4...command device, 5...memory, 6...computing device, 7... Memory, 8... Timer, 9... Creation device, 10.11... Computing device, 1
2...CRT (cathode ray tube), 13, 14...Display section, 15...Machining performance curve, 16...Approximate curve, 1
7...Memory. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] When a voltage is applied between an electrode and a workpiece, the workpiece is machined by a discharge phenomenon occurring between the electrode and the workpiece, and the machining is progressed by advancing the electrode toward the workpiece. , an electric discharge machining control device that controls the movement of the electrode while monitoring the state between the electrodes, a timer that measures time from the start of machining, and a detection device that detects the machining depth of the electrode with respect to the workpiece. ,
A machining performance curve representing the machining depth by the detection device against the time measured by the timer, a first calculation device that calculates an approximate curve of the machining performance curve, and a second calculation device that calculates a predicted machining completion time from the approximation curve. What is claimed is: 1. An electrical discharge machining control device comprising: a machining end time prediction device having a calculation device;