Tool for electrical discharge piercing of intricately-shaped hol

Details Tool for electrical discharge piercing of intricately-shaped hol Tool for electrical discharge piercing of intricately-shaped hol

1984-10-29

1988-01-26

Pellinen, A. D.

Electric heating

Metal heating

Cutting or disintegrating

219 69M, B23H 104

Patent

active

047218380

ABSTRACT:
An electrode tool for electroerosive drilling of holes in workpieces includes a central electrode fabricated from an electroconductive material and disposed in a shell with a gap. The central electrode projects from a working end of the shell toward the workpiece, the projecting portion of the central electrode being bent at an angle .alpha., the end of the bent portion being spaced from the side surface of the shell. A method for electroerosive drilling of holes having variable transverse and longitudinal sections in terms of hole depth, this method also being capable of producing holes with reverse angles and obtaining round shaped configurations of holes.

REFERENCES:
patent: 2758238 (1956-08-01), Todd
patent: 2902584 (1959-09-01), Ullmann
patent: 3306838 (1967-02-01), Johnson
patent: 3783225 (1974-01-01), Filsinger
patent: 3795604 (1974-03-01), McKinney et al.
patent: 4096371 (1978-06-01), Lozon
patent: 4104503 (1978-08-01), Di Piazza et al.
patent: 4152570 (1979-05-01), Inoue et al.
patent: 4349716 (1982-09-01), Di Piazza
patent: 4374313 (1983-02-01), Mateja et al.

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