Industrial Technology Research Institute

Hsin-Jung Chuang

Jui-Fang Liang

Hsi-Pin Li

Yu-Chin Wang

Tsuen-Pann Shieh

Re-Fang Liang

A method and apparatus for automatically compensating machining parameters on a wire cut electric discharge machine. The shape of the workpiece is monitored during machining. When a curved shape is being machined, machining parameters are compensated to minimize servo lag and wire flexture to raise the precision of the machined workpiece.

Method and apparatus for wire-cutting curved workpieces by compensating

Disclosed is a feedrate controlling method and apparatus for controlling a wire-cutting electric discharging machine (WEDM) to operate at optimal feedrate. In the apparatus, a discharge frequency counter is used to count the frequency of normal discharge and the frequency of abnormal discharge, from which two performance indexes: stability percent (STB) and efficiency percent (EFF) are obtained. These two performance indexes allow the apparatus to use a decision table to obtain an optimal feedrate variation used to change the current feedrate so as to operate the WEDM with maximum stability and efficiency.

Method and apparatus for optimal feedrate control on wire-cutting

A device for controlling a wire cut electric discharging machine is provided with a testing circuit to detect the condition between the wire electrode and the workpiece before every discharge process so as to regulate the discharge energy according to one of the detected conditions: normal discharge, arc discharge, or short circuit. The device includes two switching transistors controlled by a control unit according to the comparison result between a reference voltage and the voltage measured between the wire electrode and the workpiece being processed.

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Hsinchu, Taiwan

Hsin-Jung Chuang