Method for drawing heavy wall shells with a multi-step inside ed

Details Method for drawing heavy wall shells with a multi-step inside ed Method for drawing heavy wall shells with a multi-step inside ed

1985-02-25

1986-01-07

Gilden, Leon

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72375, 72405, B21D 2200

Patent

active

045627193

ABSTRACT:
A forming machine (10) is provided for forming a finished part (12) from a flat blank (14). Draw stations (18-24) are provided to initially form the intermediate part. Each draw station includes a punch (44, 62, 66, 70') and a draw die (48, 64, 68, 72). Each punch defines a shoulder along its length to create a first step (60) in the side walls (26) of the intermediate part. In a subsequent draw stage, a draw punch (70') forms a second shoulder along its length to create a second step (100) in the side walls (26) of the intermediate part. A draw shoulder (61) on the draw punch (71') mates with the step (60) to maintain the concentric shape thereof. In the subsequent necking and final form stages (30, 32, 34) the punch employed also has a shoulder to permit variation of the force applied to the intermediate part between the step and bottom portion.

REFERENCES:
patent: 3893321 (1975-07-01), Oberlander
patent: 3998087 (1976-12-01), Schumacher
patent: 4147049 (1979-04-01), Book

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