Method of making metal forming punches

Details Method of making metal forming punches Method of making metal forming punches

1980-09-18

1982-08-24

Combs, Ervin M.

Metal tools and implements, making

Blank or process

B21K 500

Patent

active

043454925

ABSTRACT:
An inexpensive method to make a punch for piercing or forming metal includes cutting a piece from a bar or rod, applying a phosphate and lubricant coating to the piece, extruding one end of the piece into a polygonal shape, annealing the piece, press or machine relieving the piece, machining the end of the piece having the polygonal shape and heat treating the piece to the proper hardness.

REFERENCES:
patent: 331739 (1885-12-01), Stetson
patent: 2921865 (1960-01-01), Kubie
patent: 3124975 (1964-03-01), Lovisek
patent: 3318182 (1967-05-01), Carlson

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