Method and apparatus for making shaped metal parts by forming sh

Details Method and apparatus for making shaped metal parts by forming sh Method and apparatus for making shaped metal parts by forming sh

1992-04-09

1993-01-05

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72350, 72351, B21D 2200

Patent

active

051760215

ABSTRACT:
In the method proposed a peripheral wall with at least one axial section of high shaping and fitting accuracy is made by forming an initial blank. This accuracy is achieved, in that before the peripheral wall is formed, sheet material which has been put into a plastic state is swaged in places round the periphery, then the swaged locations are sized, and/or in that during or after the formation of the peripheral wall, the wall is shaped by stamping in a plurality of places along its periphery, whereby the said zone providing shaping and fitting accuracy is formed from fitting areas at at least one side of the peripheral wall in the region of the swaged and/or stamped locations. An apparatus for carrying out such a method is generally in the form of a drawing machine, wherein the holder and/or the bottom die contain radial apertures, which open into the inner edge of the holder and/or into the shaping cavity of the die, and which are arranged at intervals round the periphery. The wall surfaces of the upper die and/or of the shaping cavity act as sizing surfaces to form fitting areas in swaged locations on the peripheral wall of the shaped part, the swaged locations being formed by said apertures.

REFERENCES:
patent: 2072847 (1937-03-01), Bolesky
patent: 2828493 (1958-04-01), Koehler
patent: 3496896 (1970-02-01), Smith
patent: 3543559 (1970-12-01), Hawkins et al.
patent: 3695201 (1972-10-01), Frankenberg
patent: 4245489 (1981-01-01), Estes et al.
patent: 4365498 (1982-12-01), Hirota et al.
patent: 4397171 (1983-08-01), Suh et al.

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