| 摘要 |
<p>A wire electrode guide apparatus for a wire cut electric discharge machine is provided which can always accurately support a wire electrode on a predetermined feed route during the electric discharge machining to thereby improving machining accuracy. The wire electrode guide apparatus (1) is provided with a change-over valve (80) for feeding or cutting off pressurized air to a pneumatic actuator (70) for driving a movable block (40) which three-point-supports the wire electrode (3) between the same and a fixing block. During the automatic wire-connecting, a pressurized air feed port (88) and a change-over port (87) at the change-over valve communicate with each other to feed pressurized air to the actuator so that a piston rod (73) leaves the movable block (40) to release an urging force applied thereto and the wire electrode is made insertable between the fixing block and the movable block. During the electric discharge machining, the change-over port is cut off from the pressurized air feed port and the pressurized air feed to the actuator is cut off, so that the actuator urges the movable block for supporting the wire. A high pressure machining liquid ejected from a nozzle (51) to enter the actuator through gaps between the respective units is discharged to the exterior through a pressure relief port (89), thereby preventing the urging force of actuator to be applied to the movable block from decreasing, thus accurately supporting the wire electrode on the predetermined feed route.</p> |
