Super stretch draw die and method

Details Super stretch draw die and method Super stretch draw die and method

1998-09-17

1999-12-28

Crane, Daniel C.

Metal deforming

By use of non-deforming work-gripping clamp and relatively...

With interrelated clamp closer and tool mover

72297, B21D 1102

Patent

active

060065761

ABSTRACT:
A die assembly for draw stamping sheet metal in a press. The die assembly has an upper die structure and a lower die structure, each constructed and arranged to me mounted on a press for reciprocal movement therebetween. The upper die structure and the lower die structure have complementary stamping surfaces for stamping sheet metal to a desired configuration. A clamping assembly and a stretching assembly grip the sheet metal along opposite sides of the complementary stamping surfaces and drivingly move apart in response to movement of the upper and lower die structures toward one another, thus pre-stretching the sheet metal as the upper and lower die structure are closed to stamp the sheet metal to a desired configuration.

REFERENCES:
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patent: 4576030 (1986-03-01), Roper
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patent: 5600991 (1997-02-01), Munzen
International Search Report re: PCT/CA98/00860 dated Feb. 15, 1999.

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