Wire electric discharge machine

Patent metadata

Field	Value
Publication number	US-2016001385-A1
Application number	US-201514790034-A
Country	US
Kind code	A1
Filing date	Jul 2, 2015
Priority date	Jul 4, 2014
Publication date	Jan 7, 2016
Grant date	—

Abstract

In a wire electric discharge machine, a control unit is configured to deposit constituents of a wire electrode between a workpiece and a portion to be cut off from the workpiece to bond the workpiece and the portion to be cut off by outputting a signal for making an output voltage of a variable DC power supply lower than during normal machining and the on-time of a second switching element longer than during the normal machining, at least in a part of a machining path.

First claim

1 . A wire electric discharge machine configured to apply a voltage to a machining gap between a wire electrode and a workpiece and generate electric discharge to machine the workpiece, the wire electric discharge machine comprising:
a DC power supply; a first switching element disposed in series between the DC power supply and the machining gap; a variable DC power supply and a second switching element disposed in series between the variable DC power supply and the machining gap; and a control unit for on/off-controlling the first and second switching elements and controlling an output voltage of the variable DC power supply, and the control unit is configured to output signals for turning on and off the first and second switching elements to separate the workpiece and a portion to be cut off from the workpiece along a machining path as a normal machining, and output a signal for making the output voltage of the variable DC power supply lower than during the normal machining and the on-time of the second switching element longer than during the normal machining, at least in a part of the machining path to deposit constituents of the wire electrode between the workpiece and the portion to be cut off from the workpiece to bond the workpiece and the portion to be cut off.

Assignees

• Fanuc Corp

Inventors

• Nakashima Yasuo
• Hasegawa Yasuo
• Kawahara Akiyoshi

Classifications

• B23H1/02 Primary

  Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges · CPC title

• B23H7/04

  Apparatus for supplying current to working gap; Electric circuits specially adapted therefor · CPC title

• B23H1/022 Primary

  for shaping the discharge pulse train (B23H1/024 takes precedence) · CPC title

• B23H7/14

  Electric circuits specially adapted therefor, e.g. power supply {(B23H3/02 takes precedence)} · CPC title

• B23H11/00

  Auxiliary apparatus or details, not otherwise provided for · CPC title