Study On Numerical Simulation Of Extrusion Forming For ZK60 Magnesium Alloys

Magnesium alloy, being the lightest structural metallic materials, has good properties such as low density, excellent biological compatibility, specific strength, and specific stiffness. And magnesium alloy is characterized by electrical conductivity, thermal conductivity, shock absorption, electromagnetic shielding and convenience of secondary use, which is widely used in the fields of aerospace, automotive, communication and electronic industry. Study on the forming of magnesium alloys and forming of simulation technology have important practical significance and economic value on the realization of magnesium alloy processing and the practical use of industrialization.At present, most products of magnesium alloy are produced by molding, die-casting, semi-solid method and other forming technology. About these products, there are many defects such as dense organization, composition segregation, low mechanical properties and that minimum thickness is too large, which make it hard to fully perform advantages of magnesium alloy. Plastic deformation of magnesium alloy can improve the organization and mechanical properties, hence greatly increase the strength and plasticity of magnesium alloy. At the same time, the sheet, bar, pipe and profiles that needed by many important fields of constructional materials, can only be produced through plastic forming process. Therefore, study on the wrought magnesium alloy and its plastic deformation is having important practical significance.In this paper, the extrusion process of angle-shaped profile of ZK60 magnesium alloys was simulated by using finite element analysis software. With the orthogonal experimental method , different extrusion ratio,extrusion temperature and extrusion speed were optimized. According to the stress distribution from simulation result determines the best process conditions of angle-shaped profile extrusion forming and the velocity distribution determines its best die structure. Then the extrusion process of ZK60 magnesium alloys bar was simulated. It is necessity that the numerical simulation guides the experiment, as the bar that is extruded under the optimization process parameters shows good properties by the analysis of metallograph and mechanical performance experiment. It is important practical significance that the simulation can be the further guidance to the experiment.