Power-Supply Control Device for Electrical Discharge Machining Apparatus

A power-supply control device that controls discharge pulse supplied to an electrical discharge machining apparatus that machines a workpiece by generating pulse discharge in a machining gap between a machining electrode and the workpiece, the power-supply control device comprising:

• a voltage level detecting unit that detects a voltage level of discharge voltage at the machining gap;
• a no-load time detecting unit that detects delay time of discharge of the discharge voltage;
• a voltage level comparing unit that compares detected voltage level with a reference voltage level;
• and
• a pulse control unit that controls pulse off time, the pulse off time being an interval between discharge pulses, based on a comparison result obtained by the voltage level comparing unit and detected delay time of discharge of the discharge voltage.

A power-supply control device that controls discharge pulse supplied to an electrical discharge machining apparatus that machines a workpiece by generating pulse discharge in a machining gap between a machining electrode and the workpiece, the power-supply control device comprising:

• a high-frequency component detecting unit that detects a high-frequency component of discharge voltage at the machining gap;
• a voltage level detecting unit that detects a voltage level of the discharge voltage;
• a no-load time detecting unit that detects delay time of discharge of the discharge voltage;
• a high-frequency component comparing unit that compares detected high-frequency component with a reference high-frequency component to obtain a first comparison result;
• a voltage level comparing unit that compares detected voltage level with a reference voltage level to obtain a second comparison result;
• and
• a pulse control unit that controls pulse off time, the pulse off time being an interval between discharge pulses, based on the first comparison result and detected delay time of discharge of the discharge voltage, and cuts off a discharge pulse based on the second comparison result.