ELECTRICAL DISCHARGE MACHINE AND ELECTRICAL DISCHARGE MACHINING METHOD

WIPO Patent Application WO/2013/121586

A1

In order to detect that an electrode has penetrated a work in which the difference between the maximum value of a discharge voltage during discharge and the discharge voltage after the electrode has penetrated the work is small, the electrical discharge machine in the present invention is configured to move the electrode (1a) to a command depth (188) and to machine a hole in the work (W) while applying a voltage between the electrode (1a) and the work and generating an electrical discharge, wherein the electrical discharge machine is provided with: an electrical discharge voltage detector (7) for detecting the minimum voltage of the discharge every predetermined period during the execution of hole machining, and a penetration detector (6) for concluding that the electrode (1a) has penetrated the work (W) when a state in which the minimum voltage detected by the electrical discharge voltage detector (7) is higher than the penetration determination voltage (181) has been maintained no less than the penetration determination maintenance time (182).

ASAI YOSHINORI (JP)
OKANE MASAHIRO (JP)
KATOUGI HIDETAKA (JP)

PCT/JP2012/053863

August 22, 2013

February 17, 2012

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MITSUBISHI ELECTRIC CORP (JP)
ASAI YOSHINORI (JP)
OKANE MASAHIRO (JP)
KATOUGI HIDETAKA (JP)

B23H7/30

JP2011206896A	2011-10-20
JP2005144651A	2005-06-09
JPS61274813A	1986-12-05
JPH05285738A	1993-11-02
JPS5741135A	1982-03-08

SAKAI, HIROAKI (JP)
Hiroaki Sakai (JP)

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