Wire electric discharge machining apparatus

Abstract

A wire electric discharge machining apparatus includes guide rollers and a single electrode wire that is wrapped around each of the guide rollers to form cut wire portions that are spaced from one another between pairs of the guide rollers. A processing power supply feeds electric power to the individual cut wire portions through a power feed element. A high frequency insulator includes wound coils of the electrode wire that are located between adjacent cut wire portions, and cores which close respective magnetic circuits of the individual coils. The magnetic circuits are magnetically insulated from one another. The power feed element is arranged between the individual cut wire portions and the individual coils, and the individual cut wire portions are insulated from one another at high frequencies by the individual coils. Voltages are impressed on the individual cut wire portions independently, so discharges can be generated simultaneously, in parallel.

1 - 6 . (canceled) 
     
     
         7 . A wire electric discharge machining apparatus comprising:
 a plurality of guide rollers that are arranged at intervals;   a single electrode wire that is serially wrapped around said plurality of guide rollers to form a plurality of individual cutting wire portions that are spaced from one another between adjacent pairs of said guide rollers;   a processing power supply including a power feed element that feeds electrical power to said cutting wire portions, individually;   a plurality of wound coils of said electrode wire, a respective one of said coils being located between each respective adjacent pair of said individual cutting wire portions, respectively; and   a plurality of cores of magnetic material, each core closing a respective magnetic circuit of each of said individual coils, each respective coil and core being magnetically insulated from the other coils and cores, whereby said individual cutting wire portions are electrically insulated from one another at high frequencies.   
     
     
         8 . The wire electric discharge machining apparatus as set forth in  claim 7 , wherein
 each of said cores has a ring-shaped configuration including, as part of the ring-shaped configuration, a support rod, and   each of said coils of said electrode wire is wound around said support rod of a respective core.