Apparatus for, and a method of, cutting a blank

Details Apparatus for, and a method of, cutting a blank Apparatus for, and a method of, cutting a blank

1990-06-26

1991-10-01

Larson, Lowell A.

Metal deforming

With cutting

By composite tool

723794, 83689, B21D 2228

Patent

active

050522078

ABSTRACT:
When a blank is cut from metal sheet which suffers from crystallographic anisotropy, there is a tendency for ears to be formed during subsequent forming operations, such as drawing or pressing. In order to compensate for this tendency, there may be used a metal blank which is not completely round, but has lobes at positions to cancel at least some of the valleys between the ears. There is described a punch and die which may be used to form such a lobed blank. The punch has four circumferentially extending lobe-forming sections. Each lobe-forming section is constructed by forming a stepped recess in the cutting edge of the punch. In each lobe-forming section, the depth of the recess varies from a maximum at the middle of the section to zero at the ends. The die is conventional.

REFERENCES:
patent: 3060992 (1962-10-01), Hopp et al.
patent: 3656394 (1972-04-01), McCutcheon
patent: 3724305 (1973-04-01), Kondo
patent: 3996832 (1976-12-01), Schubert
patent: 4277891 (1981-07-01), Dick
patent: 4362078 (1982-12-01), Ohnishi et al.
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