Patent ID: 6437277
Filing Date: 2002-08-20
Classification: B23H

Abstract:
A wire electrical discharge machining apparatus in which a working fluid is interposed between a wire electrode and a workpiece to machine the workpiece by electrical discharge, comprising:an upper guide and a lower guide which are respectively disposed above and below the workpiece and respectively incorporate wire guides for guiding said wire electrode; a pair of electric supply dies respectively provided in said upper guide and said lower guide and adapted to come into contact with and energize said wire electrode; an internal nozzle and an external nozzle which are provided in at least one of said upper guide and said lower guide; a first piping system for supplying the working fluid to said internal nozzle; a second piping system for supplying the working fluid to said external nozzle, said second piping system being independent of said first piping system; a first cooler for cooling the working fluid which is supplied to said internal nozzle through said first piping system; and a second cooler for cooling the working fluid which is supplied to said external nozzle through said second piping system, wherein the working fluid having lower temperature and higher pressure than the working fluid jetted out and supplied from said external nozzle is jetted out and supplied to the workpiece from said internal nozzle.