Wire-Discharge Machining Apparatus

A wire-discharge machining apparatus that applies, while supplying machining fluid to a space between a wire electrode traveling in a board thickness direction of a workpiece and the workpiece, a high-frequency pulse voltage to the wire electrode via a pair of power supplying units arranged above and below the workpiece and machines the workpiece with an electric discharge caused between the wire electrode and the workpiece, the wire-discharge machining apparatus comprising:

• a main power supply that applies the high-frequency pulse voltage to an upper-side power supplying unit of the pair of power supplying units arranged on an upper-side of the workpiece via a first switching element unit and applies the high-frequency pulse voltage to a lower-side power supplying unit arranged on a lower-side of the workpiece via a second switching element unit;
• a first pulse oscillator that supplies a pulse signal for controlling opening and closing operations of the first switching element unit to the first switching element unit;
• a second pulse oscillator that supplies a pulse signal for controlling opening and closing operations of the second switching element unit to the second switching element unit;
• a storing unit having stored therein power supply control data for defining the opening and closing operations of each of the first switching element unit and the second switching element unit and performing power supply control to mix an upper-side power supply state in which the high-frequency pulse voltage is applied to the wire electrode only from the upper-side power supplying unit, a lower-side power supply state in which the high-frequency pulse voltage is applied to the wire electrode only from the lower-side power supplying unit, and a both-sides power supply state in which the high-frequency pulse voltage is applied to the wire electrode from both the upper-side power supplying unit and the lower-side power supplying unit in synchronization with each other;
• and
• a pulse-oscillation control unit that controls operations of each of the first pulse oscillator and the second pulse oscillator based on the power supply control data.