WIRE ELECTRODE FEEDING DEVICE IN WIRE CUT ELECTRIC DISCHARGE MACHINE

摘要

PCT No. PCT/JP89/00425 Sec. 371 Date Feb. 27, 1990 Sec. 102(e) Date Feb. 27, 1990 PCT Filed Apr. 20, 1989 PCT Pub. No. WO89/11372 PCT Pub. Date Nov. 30, 1989.In a wire cut electric discharge machine, a plurality of magnetic field generating coils are arranged on the path along which a wire electrode is introduced into a workpiece, currents different in phase from one another are applied to the magnetic field generating coils thus arranged, so that the wire electrode is driven by the electromagnetic induction caused by the shifting magnetic fields which are produced by the magnetic field generating coils, whereby the wire electrode is smoothly fed without deformation. The leakage of magnetic flux is reduced by using a wire electrode made of magnetic material. The magnetic field generating coils are wound coaxial with the wire electrode, or they are provided so as to form magnetic fields perpendicular to the direction of insertion of the wire electrode, whereby the resultant wire electrode feeding device is simple in structure, but can produce a strong force of driving the wire electrode.