Method of hole forming

Details Method of hole forming Method of hole forming

1978-12-11

1980-09-23

Mehr, Milton S.

Metal deforming

By extruding through orifice

With cutting

72267, 72334, 72354, 83 51, 83103, B21C 2318, B21D 2810

Patent

active

042235472

ABSTRACT:
A dieless method of hot forming a hole through a metal part comprising locally heating the part followed by indenting opposite sides of the part and extruding the displaced metal centrally of the indentations to form a thin annular wall section between the indentations and then punching out the thin wall section to complete formation of the hole.

REFERENCES:
patent: 796223 (1905-08-01), Kaub
patent: 2057669 (1936-10-01), Brauchler
patent: 3399560 (1968-09-01), Connolly et al.
patent: 3531970 (1970-10-01), Pethick
patent: 3566513 (1971-03-01), Fuller

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