Selected aspects in numerical analysis of cold extrusion of tubes using cae system

The present paper deals with the numerical analysis of the process of cold extrusion of tubes. The analysis was carried out for a specific technological problem in which the principal objective was to reduce the outer tube diameter in a segment within a given length. Assumptions were made as to initial and boundary conditions, and the punch speed was preselected. In particular, the influence of the friction coefficient between the die and workpiece has been analyzed. As a result, using the CAD/CAE system, the diagrams of pressure distribution for each node in the CAD model of the die in several time steps have been obtained and presented. The results of the numerical analysis are of great importance, as they make it possible to (approximately) estimate the die load. Though the actual extrusion process is accomplished within split second, the setting up of a workpice equipped with all required measurement sensors to register the die load poses a very complicated problem and often requires significant outlays. Additionaly, the numerical result of the obtained diameter of the tube has been presented.