Method for forming counter-sunk hole in a base material and an a

Details Method for forming counter-sunk hole in a base material and an a Method for forming counter-sunk hole in a base material and an a

1976-12-03

1978-02-07

Larson, Lowell A.

Metal deforming

With cutting

By shearing tool-couple

72335, B21D 2826

Patent

active

040720390

ABSTRACT:
Counter-sunk seats are formed around preliminary holes in a work piece. Material of the work piece is thereby forced into the preliminary holes, and extruded through the preliminary holes, while other material of the work piece is extruded into a slit, previously formed in the work piece adjacent the preliminary holes, preventing undesirable swelling of the work piece.

REFERENCES:
patent: 1695476 (1928-12-01), Winkler
patent: 2453762 (1948-11-01), Schwartz
patent: 3280613 (1966-10-01), Schrom

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