Rotatable piercing tools for forming bossed holes

Details Rotatable piercing tools for forming bossed holes Rotatable piercing tools for forming bossed holes

1978-11-17

1980-01-29

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

With cutting of work or product

72112, 72479, B21D 2836

Patent

active

041854861

ABSTRACT:
A rotary piercing tool for forming, in a metal plate or the wall of a metal tube, by pressure and friction-generated heat a bossed hole, said tool comprising a tapered active end portion at one end, a shank for its attachment in a chuck of a machine tool at the other end and a coaxial cavity extending from the free end of said shank to a place at a given distance from the free end of said active end portion.

REFERENCES:
patent: 1951078 (1934-03-01), Wright et al.
patent: 1963320 (1934-06-01), Wright
patent: 2240840 (1941-05-01), Fischer
patent: 3429171 (1969-02-01), Feher
patent: 3541831 (1970-11-01), Simonton
patent: 3559445 (1971-02-01), Hougen

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