Ανάλυση της λειτουργίας διέλασης αλουμινίου προς βελτιστοποίηση της διάρκειας ζωής της μήτρας διέλασης

Abstract

This study is based on the extruded aluminium and problems that arising during this process. First, a brief historical overview of the discovery and development of aluminium as the main material in the industries and then analysed the process of extrusion and the problems that arise. Finally, some measures are proposed to reduce the problems and the results obtained after experimental procedures are also presented. Extrusion is the process in which the piece is compressed by a piston inside a metal enclosure and the other end of is suitably shaped die, and forced out of the die opening yielding product with smaller cross section and longer length. The main problems that arise are the friction that occurs between the die and billet and increases the deformation that applied to the metal and the other problem is the high temperature and pressure generated which reducing the lifetime of the die. The two solutions proposed is the optimisation of the geometry of the die and second coat in with the nanomaterial DLC matrix to the point where the aluminium is passes out. The determination of the geometry of the die proved is currently applied successfully and for the second solution must carry out three experiments. In the first experiment measured the hardness and young’s modulus before coating with the nanomaterial the die metal in the second experiment measured the hardness and young’s modulus of a sample that had been work hardened, or nitriding and third experiment that ultimately was not carried out will be measured hardness and modulus of die after becoming the overlap with the nanomaterial and comparing results. Nanomaterial, theoretically offers lower friction and greater hardness and elasticity. In this way, the extrusion process will be improved and will increase the life cycle of the die, since it will significantly reduce the pressure and the temperature pattern and the final product will exhibit better surface without cracks. In future it will be held the third experiment to prove if the above theory applies.