Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1982-12-22
1984-07-10
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
2041295, 20412955, 2041297, 204224M, 204225, 219 68, 219 69M, 29 26A, 29 26R, B23P 104, B23P 110, B23P 112, B23K 916
Patent
active
044591900
ABSTRACT:
A method of forming a cavity of a desired three-dimensional contour in a workpiece utilizes two steps of machining operation. In the first step (a), a multiplicity of holes are mechanically drilled in the workpiece substantially all over but within a three-dimensional region which is destined to constitute the cavity and which is bounded by a programmed outline corresponding to the desired three-dimensional contour whereby only a minimum of stock is left unmachined in the workpiece within the region. In the second step of operation (b), the minimum left unmachined stock among the holes and within the region is electroerosively machined with at least one electrical machining tool electrode having a machining surface which is complementary with the desired contour and which is positioned to lie in parallel with the programmed outline, by, (b1) passing an electrical machining current across a machining gap between the machining surface and the region in the presence of an electrical machining liquid in the multiple holes and the gap, and (b2) advancing the tool electrode relatively into the workpiece while maintaining the aforesaid parallelism and holding the machining gap spacing substantially constant until the machining surface reaches a position spaced by the said spacing from the said programmed outline.
REFERENCES:
patent: 3223610 (1965-12-01), Inoue
patent: 3424054 (1969-01-01), Cook et al.
patent: 3459645 (1969-08-01), Wilson et al.
patent: 3816272 (1974-06-01), Joslin
patent: 3975608 (1976-08-01), Ullmann et al.
patent: 4190938 (1980-03-01), Hillmann et al.
patent: 4337566 (1982-07-01), DiMatteo et al.
Dubno Herbert
Inoue-Japax Research Incorporated
Ross Karl F.
Valentine Donald R.
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