Process for forming sheet metal stock

Details Process for forming sheet metal stock Process for forming sheet metal stock

1977-04-25

1978-10-31

Larson, Lowell A.

Metal deforming

With temperature modification of tool or of specified...

Cooling

113120H, B21D 2220

Patent

active

041227000

ABSTRACT:
A process for forming sheet metal material having a yield strength and tensile strength which are sensitive to small changes in temperature at ambient conditions, wherein an unheated sheet metal workpiece is drawn between a concave die cavity and a mating convex punch by relative movement therebetween into the internal configuration of the die, and wherein the workpiece is selectively cooled in those areas which are susceptible to breakage. Cooling may be effected by cooling portions of the punch, or in complex part designs by cooling localized portions of the die, or both. The amount of cooling is relatively slight and may be only that required to remove heat generated by plastic deformation of the workpiece in the areas susceptible to breakage.

REFERENCES:
patent: 1580931 (1926-04-01), Thackray
patent: 3902348 (1975-09-01), Hale

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