Method of reducing springback in mechanically pressed sheet mate

Details Method of reducing springback in mechanically pressed sheet mate Method of reducing springback in mechanically pressed sheet mate

1980-12-29

1983-02-15

Larson, Lowell A.

Metal deforming

Process

Deforming sheet metal

72382, 72465, B21D 501

Patent

active

043733719

ABSTRACT:
A method of pressing sheet material utilizing counterpad pressure to eliminate springback is disclosed. The sheet material is sequentially bent at pairs of bend radii during first and second increments of striking. The first increment of striking is carried out with little or no counterpad pressure to permit a curvilinear section to form immediately beneath the male punch member due to the bending moment. The second increment of striking is carried out with a positive counterpad pressure effective to flatten the curvilinear section and thereby space the second pair of bend radii from the first pair. Residual springback from the first bending action subtracts from the springback of the second bending to reduce the resultant springback in the product.

REFERENCES:
patent: 1442912 (1923-01-01), Stoddard
patent: 2389974 (1945-11-01), Greig
patent: 2943587 (1960-07-01), Samuelsson
patent: 2966873 (1961-01-01), Hoffman et al.
patent: 3705512 (1972-12-01), Koschatzky
patent: 3844156 (1974-10-01), Hanni et al.

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