SEDL / STP / STP753-EB / STP28390S

Application of Formability Assessment to Autobody Outer Panels

Furubayashi, T
Senior research engineer, Nissan Motor Co., Tokyo,

Kojima, M
Assistant chief researcher, Central Research Laboratories, Sumitomo Metal Industries, Hyogo-Ken,

Pages: 18    Published: Jan 1982

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Abstract

Sheet metal formability in the press forming of autobody outer panels corresponds to the forming limits governed by fracture and geometrical defects. The geometrical surface defects are affected especially by the geometry of the die face. This kind of formability in a wider sense has been investigated by using simulated experimental dies of different geometry in the die face.

The forming limit relating to fracture is closely related to the r- and n-values, while the forming limit of surface defects is governed by the yield point.