Boots – shoes – and leggings
Patent
1994-02-04
1995-10-31
Trammell, James P.
Boots, shoes, and leggings
364476, 29 34R, 723792, G05B 1918
Patent
active
054635586
ABSTRACT:
Method for aiding sheet metal forming tool design, for use with a computer including memory, and forming tools including a draw die, punch and binder having surfaces designed to form the sheet metal into a part, the sheet metal being represented as a mesh including a plurality of nodes. The method includes evaluating an initial binder-set associated with an initial binder surface design during a first stage of forming the sheet metal in which at least one of the plurality of sheet metal mesh nodes is forced against the binder surface, and detecting an area of unacceptable deformation on the sheet metal mesh. The method also includes identifying the at least one of the plurality nodes forced against the binder surface associated with the unacceptable sheet metal deformation and releasing the at least one of the plurality of nodes identified, so as to allow the identified nodes to move as the sheet metal assumes a relaxed state. The method also includes redesigning the initial binder surface based on the relaxed state to obtain a modified binder surface.
REFERENCES:
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patent: 5379227 (1995-01-01), Tang et al.
patent: 5390127 (1995-02-01), Tang et al.
"Detection and Elimination of Wrinkles on an Auto-Body Panel by the Binder Set Analysis", SAE Technical Paper 930515, by Ling, Lou and Tang, Mar. 1, 1993.
"Analysis of Sheet Metal Stamping by a Finite-Element Method", Journal of Applied Mechanics, vol. 100, No. 1, Mar. 1978, pp. 73-82.
"Sheet Metal Forming Modeling of Automobile Panels", article by Tang, Gress & Ling, 15th Biennial Congress Int'l Deep Drawing Research Group, May 16, 1988.
"Evaluation Methods of Press Forming Severity in CAD Applications", Computer Modeling Sheet Forming Process, edit by Wang and Tang, The Metallurgical Soc. pp. 37-50, 1985.
Balun Thomas J.
Lou Maurice M. K.
Tang Sing C.
Ford Motor Company
Malleck Joseph W.
May Roger L.
Trammell James P.
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