Method and apparatus for forming elongated, tapered wall shells

Details Method and apparatus for forming elongated, tapered wall shells Method and apparatus for forming elongated, tapered wall shells

1977-11-09

1978-12-12

Larson, Lowell A.

Metal deforming

With cutting

By composite tool

72347, 72467, B21D 5154

Patent

active

041290240

ABSTRACT:
Elongated, thin wall shells are formed from substantially circular blanks cut from sheet material by steps including providing a blank in a blank holder on a die having an effective entrance and exit aperture, the entrance aperture having an extent substantially commensurate in size with the size of the blank to be drawn, the die having a cavity, the wall of which converges inwardly from the entrance aperture to the effective exit aperture. The wall connecting the entrance and exit apertures is defined by an arc of a sector of a circle, the sector having an angle in the range of 12.degree. to 34.degree.. The thin wall shell is formed by displacing the blank through the die by action of a punch.

REFERENCES:
patent: 2329173 (1943-09-01), Fife
patent: 2379450 (1945-07-01), Musser
patent: 2415940 (1947-02-01), Eckstein
patent: 2490926 (1949-12-01), Slater

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