Method of reducing springback in mechanically pressed sheet...

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

B - Operations, Transporting

21

D

113/66

B21D 5/01 (2006.01) B21D 11/20 (2006.01)

Patent

CA 1160910

ABSTRACT OF THE DISCLOSURE A method of pressing sheet material utilizing counterpad pressure to eliminate springback is disclosed. The sheet material is sequentially bent at paris 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.

392705

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