Piercing tools

Details Piercing tools Piercing tools

1974-12-19

1976-02-24

Larson, Lowell A.

Metal deforming

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

With cutting of work or product

72325, 72112, B21D 2836

Patent

active

039396835

ABSTRACT:
A rapidly rotatable piercing tool of hard material for forming by frictional heat and pressure a hole surrounded by a boss in a metal plate or the wall of a metal pipe, the pipe part for making the hole to size having basically triangular cross sectional areas the contour line of which has three outwardly curved legs of a shape to make the piercing tool expecially adapted to forcing bossed holes both in ductile and in hard metals.

REFERENCES:
patent: 3195156 (1965-07-01), Phipard, Jr.
patent: 3251080 (1966-05-01), Sharon
patent: 3277683 (1966-10-01), Knoblock
patent: 3429171 (1969-02-01), Feher

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