Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1981-06-12
1983-01-04
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
2041296, 204224M, 219 69W, 219 69D, C25F 300, C25F 500, B23P 102, B23P 112
Patent
active
043671292
ABSTRACT:
The workpiece is partially immersed in a first electroerosion-machining liquid so that the surface of the liquid is positioned at a predetermined height from the lower surface of the workpiece. A wire electrode is passed vertically through the workpiece to define a machining gap therebetween which extends across the entire thickness of the workpiece including an upper portion and a lower portion divided from each other by the liquid surface of the first electroerosion-machining liquid. A second electroerosion-machining liquid having a specific resistivity greater than that of the first is supplied from above the workpiece into the machining gap along the upper portion and then allowed to diffuse into the machining gap along the lower portion. Electroerosive material removal from the workpiece occurs along the upper portion uniformly at a first rate and along the lower portion at a varying second rate which is not less than the first rate and which increases as the distance from the liquid level is increased. By relatively displacing the wire electrode and the workpiece in the horizontal plane, a contour having a non-tapered and tapered sections stepped in the direction of thickness of the workpiece is thus generated in the workpiece.
REFERENCES:
patent: 2974216 (1961-03-01), Inoue
patent: 3929163 (1975-12-01), Ullmann et al.
patent: 4263116 (1981-04-01), Inoue
patent: 4317019 (1982-02-01), Itoh
Inoue-Japax Research Incorporated
Kaplan G. L.
Nguyen N.
Ross Karl F.
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