Drawing hollow blanks in multiple steps

Details Drawing hollow blanks in multiple steps Drawing hollow blanks in multiple steps

1978-09-11

1980-08-19

Gilden, Leon

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

B21D 2228

Patent

active

042177707

ABSTRACT:
Plural dies for stepwise drawing a hollow blank on a mandrel are spaced so that a downstream die is placed at a location where the drawing strain from the previous die has been reduced to zero because the tensile stress in the deforming zone is balanced by adhesion to the mandrel.

REFERENCES:
patent: 2412813 (1946-12-01), Keller
patent: 3509754 (1970-05-01), Messingill et al.
patent: 3774426 (1973-11-01), Jeyik
patent: 3848449 (1974-11-01), Campion
patent: 3972217 (1976-08-01), Misonoo

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