Patent ID: 6831245
Filing Date: 2004-12-14
Classification: B23H

Abstract:
A wire electric discharge machining apparatus comprising:a wire guide upper unit for slidably retaining a wire electrode above a subject to be machined; a wire guide lower unit for slidably retaining the wire electrode below the subject; an arm member for retaining the wire guide lower unit in a position opposite to the wire guide upper unit; a machining tank filled with a machining solution in which the subject is immersed and defining a long hole through which the arm member can pass and move; and a sealing unit, fixed to an outside surface of the machining tank, for suppressing outflow of the machining solution from the long hole formed in the machining tank, wherein the sealing unit is constituted by a base, having a hole corresponding to the long hole, a sealing plate and a packing, the sealing plate for blocking the long hole of the machining tank; wherein a groove is formed along an outer periphery of the hole of the base; wherein the wire electric discharge machining apparatus further comprises a machining solution jetting unit having nozzles for jetting the machining solution into the groove, the machine solution jetting unit for jetting the machining solution into a small gap formed between a peripheral portion of the long hole and the sealing plate.