Journal of the Japan Society for Technology of Plasticity
Online ISSN : 1882-0166
Print ISSN : 0038-1586
ISSN-L : 0038-1586
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Frictional Behavior of Steel Sheets in Press Forming and Optimization of Friction Testing Conditions
Kazuhiko HIGAIYoshikiyo TAMAIYuji YAMASAKIJiro HIRAMOTO
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2017 Volume 58 Issue 672 Pages 41-46

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Abstract

The typical sliding conditions at the fracture-risk positions in press forming of automotive parts were identified by FE analysis and laboratory-scale sliding tests. The investigated sliding conditions fall into three categories:the inflow sections of a steel sheet (group A), the punch shoulders in drawing (group B), and the stretch sections (group C) . The frictional properties of group A and group B could be evaluated by measurement of the dynamic coefficient of friction in the flat sliding tests under a high contact pressure and at low sliding speed in each group area. The frictional properties of group C could be evaluated by the static coefficient of friction, which is measured as the primary peak in a coefficient of friction – stroke curve under the specific sliding test conditions (contact pressure:7MPa, sliding speed:10mm/min, tool length:10mm) .

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© 2017 The Japan Society for Technology of Plasticity
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