FRICTION AT SHEET METAL TESTING BY IRONING IN CONDITIONS OF HIGH PRESSURE

Abstract

In cold metal forming processes characterized by high contact pressures, local tool loading, generation of new workpiece surfaces etc., realization of appropriate lubrication regime and micro-welding elimination are of great importance. Correct choice of tribo-conditions and identification of boundary relations at this contact surfaces enables controled flow in surface layer which has the yield stress enough lower then basic material. Results of presented investigations are related to cold metal forming, especially to ironing.