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

B - Operations, Transporting

26

F

164/102

B26F 1/14 (2006.01) B21D 28/14 (2006.01) B21D 28/34 (2006.01) B26F 1/44 (2006.01)

Patent

CA 2020483

4071US ABSTRACT OF THE DISCLOSURE 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.

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