The Effect of Paraffinic Mineral Oil Lubricant in Cold Forward Extrusion

This paper presents the finite element analysis of cold forward extrusion and the analysis of the contact sliding behaviour on the die-billet surface by paraffinic mineral oil lubrication with kinematic viscosity of 92 mm2/s at 40 °C. The analysis dealt with the plasticity flow that was investigated by finite element method in order to identify the loads acting on the billet. The finite element analysis of stresses was performed based on load distributions calculated from experimental test. The time behaviour of displacements on the billet was then used as inputs for the extrusion model. The presented method provides good results with reduced computation time. The results of the extrusion model revealed that the zones of high stress located at the sharp edges of the die, which explains the observed extrusion force to reach a peak value.