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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).

Frictional Behavior of Steel Sheets in Press Forming and Optimization of Friction Testing Conditions