Controller for wire electric discharge machine

Details Controller for wire electric discharge machine Controller for wire electric discharge machine

2006-05-02

2006-05-02

Picard, Leo (Department: 2125)

Data processing: generic control systems or specific application

Specific application, apparatus or process

Product assembly or manufacturing

Reexamination Certificate

active

07039490

ABSTRACT:
A controller for a wire electric discharge machine which can achieve stable machining with high surface accuracy without requiring adjustment of a gain or the like in wire-electrode feed control. A discharge gap detection unit detects a voltage between a wire electrode and a workpiece. An amount-of-machining-per-unit-distance change detection unit obtains an average machining voltage, and a voltage drop EXthat is a difference between the obtained average machining voltage and a no-load voltage. A comparative determination unit obtains a ratio ES/EXbetween a reference voltage drop ESstored in a reference-amount-of-machining-per-unit-distance relative value storage unit and the drop voltage EX. A feed pulse arithmetic unit obtains a feed speed that makes the amount of machining per unit time constant, on the basis of the ratio ES/EXand a predetermined feed speed, and distributes feed pulses to motors to thereby move the wire electrode relatively to the workpiece. Since the amount of machining per unit time is kept constant, the surface accuracy in finishing is high and stable machining can be performed.

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Search Report for corresponding EP Application EP 04 25 1666 mailed Jul. 19, 2004.
Notice of Grounds for Rejection (Office Action) dated Aug. 2, 2005 with an English translation.

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