Electrical discharge machining method and apparatus using ultrasonic waves and magnetic energy applied concurrently to the machining gap
AssigneeInoue-Japax Research Incorporated
InventorKiyoshi Inoue
Life of this patent
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Abstract
An EMD method and apparatus, especially for a cavity-sinking type of machining, wherein a combination of magnetic fluxes and ultrasonic waves is applied externally to the region of a machining recess being progressively formed in a workpiece electrode juxtaposed with a tool electrode while the electrodes are displaced relative to one another and a succession of machining electrical pulses are applied across a dielectric flooded machining gap provided therebetween.
Claims29
A method of electroerosively machining a workpiece, comprising the steps of:
- positioning a tool electrode in a spaced juxtaposition with said workpiece to define a machining gap therewith in a machining liquid received in a worktank;
- applying a succession of electrical machining pulses between said tool electrode and said workpiece to produce electrical discharges across said machining gap flooded with said machining liquid, thereby removing material from said workpiece and forming a recess therein;
- relatively displacing said tool electrode and said workpiece so that the successive removal of material progressively advances the formation of said recess in said workpiece;
- applying a magnetic field of a magnitude not less than 100 Gauss to the region of said recess for a first time period;
- applying ultrasonic waves of a frequency not less than 10 kHz through said machining liquid to the region of said recess for a second time period;
- and
- providing a third time period in which said first and second time periods coincide with each other at least partly.
An apparatus for electroerosively machining a workpiece, having a tool electrode positionable to be spacedly juxtaposed with the workpiece to define a machining gap therewith in a machining liquid in a worktank, power supply means for applying a succession of electrical machining pulses between the tool electrode and the workpiece to produce successive electrical discharges across the machining gap, thereby electroerosively removing material from the workpiece and forming a recess therein and means for relatively displacing the tool electrode and the workpiece so that the successive material removal progressively advances the formation of the recess in the workpiece, the apparatus further comprising:
- first means for applying a magnetic field of an intensity not less than 100 Gauss to the region of said recess for a first time period;
- and
- second means for applying ultrasonic waves of a frequency not less than 10 kHz to the region of said recess for a second time period,
- said first and second means being operative to provide a third time period in which said first and second time periods coincide with each other at least partly.
Dependencies are inferred from the claim text.