Characteristics of Friction in Sheet Metal Sliding with Thickness Reduction

Abstract

Presented in the paper are results obtained in investigation of the effects of tribological conditions in cold metal forming. A characteristically tribo-model is strip ironing between angled die surfaces. Investigated were the changes in ironing force, pressure, friction coefficient in single and multy-phase sliding in the conditions of boundary lubrication. The low carbon mild steel sheet, suitable for plastic forming was used. In course of investigation the so called constant low friction has been realized in condition of high contact pressures. Especially significant are the results of multi-phase sliding, which simulates the moving of piece through dies.