Fanuc Corporation

Shinji Yoda

Toshiyuki Aso

Tomoyuki Furuta

Akiyoshi Kawahara

Yasuo Nakashima

Tomoaki Matsunaga

Toyotada Kajitori

Whether or not an inter-electrode voltage exceeds a voltage threshold is determined after a predetermined inter-electrode state determination period has passed since application of an induction voltage (inter-electrode voltage) to an inter-electrode gap. Thus, an inter-electrode gap amount between a wire electrode and a work is estimated. A pause time during which electrical discharge is not performed is changed according to an estimation result of the inter-electrode gap amount.

Wire electrical discharge machining device

In a wire electric discharge machine, a discharge delay time is used to classify the inter-electrode state into three categories; a short-circuit state, small-gap state, and large-gap state. Based on this classification, the magnitude of a machining current supplied from a main discharge circuit is determined. If the discharge delay time is zero (i.e., if no electric discharge is generated) after the lapse of a predetermined time since the start of the application of a machining voltage to an inter-electrode gap by an auxiliary discharge circuit, the inter-electrode gap is determined to be short-circuited by machining chips. Thereupon, a short-circuit machining current is supplied from the main discharge circuit to the inter-electrode gap to remove the machining chips. In this way, establishment of a complete short-circuit state is prevented so that the machining efficiency is improved to increase the machining speed.

Wire electric discharge machine

Method of automatically recovering wire breakage in wire electric

Cut-out piece removing method in electric discharge machining and an

Core removing apparatus

Growing community of inventors

Yamanashi, Japan

Shinji Yoda