Influence of contact conditions on the process of thin sheet sliding during the flat die test

Abstract

Influence of tool contact surface type and lubricant in combination with variable contact pressure is recent research subject in field of deep drawing of thin sheet metals. For that purpose developed was original tribological model based in sliding process between flat contact surfaces in conditions of simultaneously variable contact pressure intensity and made was appropriate computerized device. Realized was multifactor experiment with steel sheets DC04 stripes applying. Also applied were four tool contact surfaces types, two lubricant types and two contact pressure functional dependencies on sliding length. Based on previously defined contact pressure-sliding length mathematical functions, for every above mentioned conditions obtained were tensile forces and friction coefficient dependencies. In that way there is possibility to evaluate tribological factors influence on process parameters. Also, significant influence have roughness of tool contact surfaces and their ability of appropriate lubricant accumulation in contact zone.