| 摘要 |
A working fluid supplying apparatus of an electric discharge machine comprises a main pipe and a branching pipe for connecting a pump for increasing a working fluid in pressure and delivering the thus pressurized working fluid with a nozzle for injecting the pressurized working fluid, these pipes being connected in parallel to each other, and respectively provided therein with a servo valve for flow rate control, which has its valve opening in accordance with a command indicative of a target flow rate and supplied from a controller, and an on-off valve which is rendered open upon a predetermined servo valve opening being reached, whereby non-linearity between the servo valve opening and the flow rate of the working fluid flowing through the main pipe provided with the servo valve is compensated for by the working fluid supplied through the branching pipe provided with the on-off valve so as to achieve a liner control of the working fluid flow rate even when the target flow rate increases beyond a value corresponding to the predetermined servo valve opening.
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