Elasto-plastic FEM analysis of cylinder upsetting between two flat platens

A whole analysis model including forging and flat platens is built, which is used to analyze the process of upsetting a cylinder between flat platens. The influence of surface friction and transient temperature are comprehensively considered. By means of ANSYS software, the elasto-plastic FEM analysis of the whole upsetting process is carried out. From the point of view of numerical calculation, the correctness of the centre region tension stress theory about upsetting a cylinder between flat platens is tested and verified. The concept of plasto-nucleus is presented to explain the forming of double dumps. The effect of temperature is inspected. The relation curves between the radial stress of the symmetry centre point and the relative pressure ratio are given.