Method for aiding sheet metal forming tooling design

Details Method for aiding sheet metal forming tooling design Method for aiding sheet metal forming tooling design

1992-12-21

1995-01-03

Gordon, Paul

Boots, shoes, and leggings

364476, 29 34R, 298972, 72347, 723792, G06F 1546, B21D 502

Patent

active

053792270

ABSTRACT:
Method and system for evaluating sheet metal forming tooling design, for use with a draw die including a punch and binder designed to form the sheet metal into a part, utilizing improved implicit time integration methods that reduce numerical instability, thereby enhancing convergence of numerical solutions. The sheet metal and tool surface of the punch are each represented as a mesh having a plurality of nodes. Contact nodes between the sheet metal mesh nodes and the tool surface mesh can be identified. A first embodiment includes minimizing discontinuities generated by unloading by determining a stress increment of a sampling point in the sheet metal mesh according to an incremental deformation theory of plasticity. A second embodiment includes modelling a draw-bead as a plurality of nonlinear elastic springs to minimize discontinuities in the spring force during unloading. A third embodiment includes filtering a relative velocity vector of at least one contact node with respect to the tool surface, to avoid frictional force oscillations due to the change in direction of the relative velocity vector during formation of the part.

REFERENCES:
patent: 4811582 (1989-03-01), Story et al.
patent: 5128877 (1992-07-01), Tang
Journal of Applied Mechanics, vol. 100, No. 1, Mar. 1978, Analysis of Sheet Metal Stamping by a Finite-Element Method, N.-M. Wang & B. Budiansky, pp. 73-81.
ASM International, Sheet Metal Forming Modeling of Automobile Body Panels, S. C. Tang, et al., May 1988.

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