CONTROL OF MATERIAL FLOW IN A COMBINED BACKWARD CAN - FORWARD ROD EXTRUSION

The paper deals with an analysis of an extrusion process with a divide d material flow. As we are forced to seek for optimal technological so lutions with short testing times and low risks and costs, a reliable p rocess evaluation is of the greatest importance. The paper discusses t he influences of tool geometry, friction and lubrication as well as wo rkpiece properties on balanced material flow in a combined extrusion p rocess. The FEM analysis applying the DEFORM code has been used in ord er to predict the process parameters and to estimate its stability. Th e subsequent experimental verification has resulted in a conclusion th at modern computer aided tools, tuned by proper experimental sets, can be used for fast and reliable cold metal forging process planning.