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US 4,251,706 AGranted
Electrode tool for EDM and method for utilizing such electrode tool
AssigneeAteliers des Charmilles S.A.
InventorsCharles Frei, Jean Pfau
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AssigneeAteliers des Charmilles S.A.
InventorsCharles Frei, Jean Pfau
Estimating the term…
A method for machining materials difficult to cut by EDM conventional processes and consisting in providing contamination of the machining or dielectric fluid used in the course of electrical discharge machining with particles of a metal or metallic alloy of low vaporization temperature selected, for example, from the group consisting of zinc, cadmium, tin, lead, antimony and bismuth. The contamination particles are obtained directly from a surface coating placed directly on the electrode tool or from an additional piece of metal or metallic alloy which is electro-eroded at the same time as a cut is effected by the electrode tool in an electrode workpiece, and the contaminated fluid is circulated in the machining zone between the electrodes, the contaminated fluid facilitating the triggering of the electrical discharges in the machining zone and providing an increase of the machining rate, or material removal rate.
A method for EDM machining an electrode workpiece by means of an electrode tool, said method comprising introducing into the machining zone between said electrodes an EDM machining fluid contaminated as a result of having been used previously for machining an element containing at least one metal having a low vaporization coefficient.
In an EDM apparatus for machining an electrode workpiece by means of an electrode tool wherein an EDM pulse generator is connected across said electrodes and a machining fluid is fed in a machining zone between said electrodes, the improvement comprising means for machining by electrical discharges a metallic surface comprising at least one metal having a vaporization temperature lower than the vaporization temperature of any of the metals of said electrode workpiece, and means for circulating said machining fluid successively through a first machining zone in which said metallic surface is subjected to EDM pulses and a second machining zone between said electrode tool and said electrode workpiece.
Dependencies are inferred from the claim text.