Method of modifying stamping tools for spring back...

Data processing: generic control systems or specific application – Specific application – apparatus or process – Product assembly or manufacturing

Reexamination Certificate

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C700S098000, C700S118000

Reexamination Certificate

active

06947809

ABSTRACT:
A method of developing a stamping die for a workpiece is provided, which includes the steps of stamping a workpiece in a current die. A measurement is made of the stamped workpiece to determine its profile. The profile is compared with the design intent workpiece to determine dimensional variance. If the variance is within predetermined limits, the development is complete. If the variance is beyond limits, a conceptual determination is made of the residual forces in the current die stamped workpiece when the current die stamped workpiece is restamped by a design intent die. This conceptual determination is carried out on a computer. From the determination of residual forces, a new current die is developed. The new current die then stamps the workpiece. The steps are repeated until the stamped workpiece profile is within predetermined limits.

REFERENCES:
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patent: 4802357 (1989-02-01), Jones
patent: 4989439 (1991-02-01), Ewert et al.
patent: 6013997 (2000-01-01), Heideman et al.
Longwu Wu “Tooling Mesh Generation Technique for Interative FEM Die Surface Design Algorithm to Compensate for Springback in Sheetmetal Stamping”, Engineering Computations, vol. 14, No. 6, 1997,pp. 630-648; MCB University Press.
A.P. Karafillils and M.C. Boyce: Tooling Design in Sheet Metal Forming Using Springback Calculations; Int. J. Mech. Sci, vol. 34, No. 2, pp. 113-131, 1992; Pergamon Press, pic.
Apostolos P. Karafillis and Mary C. Boyce; Tooling and Binder Design for Sheet Metal Forming Processes Compensating Springback Error; Int. J. Mach. Tools Manufact., vol. 36, No. 4, pp. 503-526, 1996, Pergamon.
Longwu Wu; Tooling Mesh Generation Technique for Interative FEM Die Surface Design Algorithm to Compensate for Springback in Sheetmetal Stamping; Engineering Computations, vol. 14, No. 6, 1997, pp. 630-648; MCB University Press.

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