Method and apparatus for hot die draw forming metal sheets

Details Method and apparatus for hot die draw forming metal sheets Method and apparatus for hot die draw forming metal sheets

1990-02-09

1991-07-30

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72296, B21D 2408

Patent

active

050351338

ABSTRACT:
A method and apparatus for draw forming a metal sheet over a male form to produce a three-dimensional shape. A sheet of metal is clamped between upper and lower draw plates positioned above the male form. The upper plate has an edge conforming to the male form shape. The plates and sheet are moved downwardly over the form with the edge of the upper plate firmly pressing the sheet against the form. The clamping pressure between the draw plates allows suitable slippage as drawing proceeds to produce a drawn shape of intended thickness. The drawn shape has a configuration conforming to the outer surface of the male form and has an outer surface of improved uniformity and appearance due to the wiping action of the upper plate edge.

REFERENCES:
patent: 2342437 (1944-02-01), Summers
patent: 2354003 (1944-07-01), Ernst et al.
patent: 3314275 (1967-04-01), Mullen
patent: 3564895 (1971-02-01), Pfanner et al.

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