Method for forming threadings in a bushing which is used to secu

Details Method for forming threadings in a bushing which is used to secu Method for forming threadings in a bushing which is used to secu

1994-09-08

1996-05-21

Larson, Lowell A.

Metal deforming

With cutting

By composite tool

72356, 72370, B21D 5116

Patent

active

055178448

ABSTRACT:
A method is provided for forming threadings in a bushing and includes (a) providing a die; (b) extruding a tubular bushing made of metallic material into the die; (c) providing a punch member to punch into the bushing to form a first threading therein; (d) pressing down the bushing along the die and again providing the puncher member to punch into the bushing to form a second threading therein; and (e) repeating the step (d) until a plurality of predetermined threadings are formed in the bushing.

REFERENCES:
patent: 4301672 (1981-11-01), Simon
patent: 4594874 (1986-06-01), Bononi et al.

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