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Device for controlling electrical discharge machine

A technology of electric discharge machine and control device, which is applied to electric machining equipment, metal machining equipment, circuits, etc., and can solve problems such as prolongation of stop time.

Active Publication Date: 2013-08-14
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent Document 2 describes a technique in which, in an electrical discharge machining device, a discharge is generated between electrodes, a high-pass filter extracts only high-frequency components of the voltage waveform between electrodes, and a rectifier rectifies the high-frequency components, integrating The device integrates the rectified output, and the comparison device compares the integral voltage with the reference voltage. During the stop period of the processing condition control device, the output of the comparison device is checked. If the discharge state is judged to be bad, the stop time extend

Method used

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  • Device for controlling electrical discharge machine
  • Device for controlling electrical discharge machine
  • Device for controlling electrical discharge machine

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Experimental program
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Embodiment approach 1

[0028] use figure 1 Next, the control device 100 for the electrical discharge machine EDM according to Embodiment 1 will be described. figure 1 It is a figure which shows the structure of the control apparatus 100 of the electric discharge machine EDM.

[0029] The control device 100 controls the operation of the electric discharge machine EDM. For example, in an electric discharge machine EDM, a machining power source 1 applies a machining voltage between the machining electrode 2 and the workpiece 3 to generate pulse discharge between the electrodes to machine the workpiece 3 . The control device 100 has the following configuration.

[0030] The acquiring unit 70 acquires a parameter indicating a state of electrical discharge between electrodes (that is, a parameter of normal electrical discharge) while the processing conditions are controlled by the control unit 60 so that a normal electrical discharge occurs between the electrodes. Specifically, the acquisition unit 70 ...

Embodiment approach 2

[0092] Next, a control device 100i for an electrical discharge machine EDM according to Embodiment 2 will be described. Hereinafter, description will focus on portions different from Embodiment 1. FIG.

[0093] In the first embodiment, the acquisition unit 70 first detects the discharge voltage between the electrodes, but in the second embodiment, the acquisition unit 70i first detects the discharge current between the electrodes.

[0094] Specifically, as Figure 7 As shown, the acquisition unit 70i of the control device 100i has a current detection unit 74i and a current-voltage conversion unit 75i. The current detection part 74i detects the discharge current between electrodes. The current detection unit 74i receives, for example, a differential signal from both ends of the interpole through two input terminals, and outputs a current corresponding to the input differential signal as a detected discharge current from one output terminal.

[0095] The current-voltage conve...

Embodiment approach 3

[0098] Next, a control device 100j for an electrical discharge machine EDM according to Embodiment 3 will be described. Hereinafter, description will focus on parts different from Embodiment 1. FIG.

[0099] In the first embodiment, the threshold adjustment is performed stably by the determination unit 40 , but in the third embodiment, the adjustment of the threshold by the determination unit 40 is performed based on an instruction from the user.

[0100] Specifically, as Figure 8 As shown, the control unit 60j of the control device 100j has an operation unit 61j and a mode determination unit 62j. The control device 100j has, as operation modes, an A mode in which threshold value adjustment is not performed and a B mode in which threshold value adjustment is performed, for example. In an initial state, the mode determination unit 62j determines the operation mode of the control device 100j to be the A mode, and stops the operation of the calculation unit 30 and the determin...

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Abstract

A controller of an electrical discharge machine comprises: a control unit that controls a machining condition set by the electrical discharge machine; an acquisition unit that acquires a parameter indicating an electrical discharge state between poles in a state where the machining condition is controlled by the control unit so that a normal electrical discharge occurs between the poles; an arithmetic unit that obtains a probability density distribution of the acquired parameter; a decision unit that decides a threshold that specifies a boundary between a normal electrical discharge and an abnormal electrical discharge between the poles based on the obtained probability density distribution; and a discrimination unit that discriminates whether the electrical discharge state between the poles is normal or abnormal by using the decided threshold, and wherein the control unit controls the machining condition based on a discrimination result of the discrimination unit.

Description

technical field [0001] The present invention relates to a control device for an electrical discharge machine. Background technique [0002] Conventionally, there is a technique of judging the state of electric discharge between the electrodes of the electric discharge machine and the electrodes of the workpiece, and then using the judgment result to control the electric discharge machine. [0003] Patent Document 1 describes a technology in which a discharge is generated between the electrodes in an electrical discharge machining device, and the slope of the voltage change of the discharge, the discharge level, and the high-frequency component are detected, and the detection signals of the detected signals greater than or equal to The two types are combined to judge the discharge state. Accordingly, according to Patent Document 1, accurate detection observation can be performed, and further, control of each part based on the observation can be made more appropriate. [000...

Claims

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Application Information

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IPC IPC(8): B23H1/02
CPCB23H1/024B23H1/02
Inventor 森田一成彦坂博纪小野寺康雄加藤木英隆
Owner MITSUBISHI ELECTRIC CORP
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