THE CHANGE OF CONTACT PRESSURE IN BLANK HOLDER ZONE AND TRIBOLOGICAL INFLUENCES ON DEEP DRAWING

Abstract

Tribological conditions in deep drawing process are as important as other factors (material, work piece geometry, machine and tool). Tribological activities on work piece flange should be especially emphasized because of activity of holding force which is very convenient parameter for monitoring and control. The paper gives results of experimental researches, realized on special researching equipment. Standard sheet metal and sheet metal with anticorrosion coatings, and various lubricants are used in experiment. The obtained results point to the influence of contact pressure onto the drawing force, strain distribution, forming limit etc.