Deformation Analysis of Large Sized Panels in the Press Shop

  • H. Ishigaki

Abstract

This paper describes experimental results of forming limits for steel sheets and deformation states in large-sized autobody panels together with examples of applying these results to analysis of actual press forming operations. The forming limit is defined as the amount of strain at which a pronounced roughening in surface finish occurs. This roughening signals the onset of necking as determined by means of stylus instrument measurement and visual observation. Based on this definition, forming limit curves were obtained for both simple and complex deformation paths. An example of using these data in the forming of a new quarter panel is given.

The deformation states in large-sized autobody panels are defined by classifying the measured strains in the formed panels into several deformation ranges depending on the magnitude and ratio of strains. The result is, for each panel, a map-like diagram (strain composition diagram) from which the forming severity of panels may be evaluated. Several examples of using such a diagram in actual forming operations to aid in understanding the relations among deformation defects, deformation ranges and die geometry are given.

Keywords

Explosive Flange 

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Copyright information

© Plenum Press, New York 1978

Authors and Affiliations

  • H. Ishigaki
    • 1
  1. 1.Toyota Motor CompanyJapan

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