Apparatus for forming a sheet metal product having an opening

Details Apparatus for forming a sheet metal product having an opening Apparatus for forming a sheet metal product having an opening

1982-09-27

1985-04-09

Crane, Daniel C.

Metal deforming

With cutting

By composite tool

72464, 225103, B21D 2800, B21D 2832

Patent

active

045093555

ABSTRACT:
A process of manufacturing a sheet metal product including an opening surrounded at least partially by a drawn area, the process comprising steps of providing a pair of drawing dies, one having a drawing punch and the other having a drawing cavity adapted for cooperation with the drawing punch, putting a blank of sheet metal between the drawing dies, advancing one of the dies toward the other so that the blank is drawn by the punch and the cavity. The process includes a step of forming a slit in the blank by tearing the blank at an area which corresponds to the opening and which is adjacent to an area where the blank is stretched during the drawing step.

REFERENCES:
patent: 402240 (1889-04-01), Hayes
patent: 445603 (1891-02-01), Turner
patent: 833470 (1906-10-01), Lipowsky
patent: 2274835 (1942-03-01), Koch
patent: 2308998 (1943-01-01), Misfeldt
patent: 2460483 (1949-02-01), Berliner
patent: 3190094 (1965-06-01), Kutas
patent: 3267780 (1966-08-01), Roth
patent: 4277996 (1981-07-01), Spengler

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