Method of stamping multilayer sheets

Details Method of stamping multilayer sheets Method of stamping multilayer sheets

2011-08-16

2011-08-16

Sullivan, Debra M (Department: 3725)

Metal deforming

With cutting

By composite tool

C072S337000

Reexamination Certificate

active

07997114

ABSTRACT:
A method includes providing a sheet having layers characterized by different softnesses, providing a die component having a leading surface that is generally concave, and causing the leading surface to puncture the sheet thereby to cut a part from the sheet. The method provides improved flatness of parts cut from sheets having layers of varying softness and prevents soft material from exiting the sheet because the peripheral edge of the leading surface applies maximum pressure to the sheet during the puncturing step.

REFERENCES:
patent: 1861648 (1932-06-01), Vehko
patent: 3656379 (1972-04-01), Clark
patent: 4599126 (1986-07-01), Duffield
patent: 5702556 (1997-12-01), Okuma et al.
patent: 6401510 (2002-06-01), Morse et al.

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