Method of draw forming analytically determined binder wrap blank

Details Method of draw forming analytically determined binder wrap blank Method of draw forming analytically determined binder wrap blank

1990-06-08

1992-07-07

Smith, Jerry

Boots, shoes, and leggings

364472, 72347, 298972, 29 34R, G06F 1546, B21D 502

Patent

active

051288770

ABSTRACT:
Method of rapidly determining a binder wrap for a nonsymmetrical polygonal panel to be drawn formed, comprising: (a) forming a coordinate-based model of the blank outline of said panel; (b) specifying the displacement boundary condition of the binder wrap by nonlinear theory of mechanics, including: (i) defining arc sets to fit projections of opposite sides of the blank outline, having the greatest curvature, onto arc planes while incrementally bending the panel from a known flat condition to a binder surface condition and controlling each arc set to pass through a fixed point as it is changed in radius, (ii) interpolating from said arc sets to generate points on the unprojected opposite sides having such greatest curvature and thus defining the binder surface for the blank outline along such sides, (iii) defining the binder surface for the blank outline along sides having the least curvature by forcing such sides to lie on the binder surface through the act of proportionally reducing the gap or interference during the bending process in step (b)(i); and (c) determining the deformed shape of the panel suspended inside the punch opening line.

REFERENCES:
patent: 4016742 (1977-04-01), Shiokawa
patent: 4486841 (1984-12-01), Koyama et al.
patent: 4698991 (1987-10-01), Kirii et al.
"Evaluation Methods of Press Forming Severity in CAD Applications", Takahashi et al, Computer Modeling of Sheet Forming Process, Edit by Nang C. Tang, The Metallurgical Soc., pp. 37-50, 1985.

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