Steel bathtub and forming method

Details Steel bathtub and forming method Steel bathtub and forming method

1986-09-10

1988-04-19

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72350, 4538, B21D 2221, B21D 2226, B21D 2230, B21D 2416

Patent

active

047381299

ABSTRACT:
This invention relates to a method of forming a bathtub having a sloped back end in a sheet steel drawing process, wherein a steel blank is first held onto a draw ring and bed by a blank holder. A punch in the general shape of the bathtub is forced into the blank. As the punch extends into the draw ring, an air draw is made at the portion of the blank corresponding to the sloped back end in the final product of the process. This portion of the blank develops wrinkles as the drawing operation continues, until the blank contacts a die in the bed of the set-up. As the punch extends further into the draw stroke the blank is pressed into recesses in the die by corresponding bulges in the punch, thereby "ironing" out the wrinkles in the blank so that the sloped end is smooth.

REFERENCES:
patent: D216119 (1969-11-01), Kaiser
patent: D250962 (1979-01-01), Bonsack
patent: D271995 (1983-12-01), Topete
patent: D274456 (1984-06-01), Cuttriss
patent: D287397 (1986-12-01), Cuttriss
patent: 1033209 (1912-07-01), Stucki
patent: 2231345 (1941-02-01), Potchen
patent: 2325369 (1943-07-01), Chesney
patent: 3344646 (1967-10-01), Moller

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