Industrial Technology Research Institute

Chao Hsiu Lee

Jui-Kuan Lin

Yung-Feng Nien

Hsin Chaun Su

An apparatus and method is provided for use on an electric discharging machine to enhance the working efficiency of the electric discharging machine. The apparatus and method are directed to the control of the ignition delay time of the ignition voltage used to ignite the electric discharges applied to the workpiece for machining the workpiece. The apparatus and method are directed to the objective of making the duty factor as close to unity as possible. The apparatus and method are characterized in that the average discharge voltage is computed by the CNC (computer numerical control) unit instead of an analog voltage averaging circuit as in the prior art. The average discharge voltage is then used for the determination of the average ignition delay time to accordingly adjust the gain of the servo control loop of the discharging. The electric discharging machine then detects the ignition delay time to accordingly adjust the magnitude of the ignition voltage and the length of the discharge off-time. Moreover, the electric discharging machine is capable of detecting whether the number of consecutive occurrences of arcing reaches a preset number; if yes, the electric discharging machine will perform a residue cleaning process. Moreover, the electric discharging machine is capable of detecting whether a short-circuit occurs; and, if yes, the electric discharging machine will immediately stop the machining process.

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Taichung, Taiwan

Chao Hsiu Lee