Research On Forming Of Magnesium Alloy Products With Fan-shaped Shell

The magnesium alloy fan-shaped shell is the important part on a certain model product,which has complex shape,high size accuracy,certain performance request,and large production lot.For this part,it currently has been mading by the way of machine cut processing,but the material and energy consumption are big,production cost is high,so it not only does not meet the development requirements of energy saving,but aslo difficult to meet the product batch production.In view of these questions,The"isothermal extrusion-cold extrusion composite forming"method to the magnesium alloy fan-shaped shell was researched.According to the characteristics of the structure of the parts,the forming process was analysed and extrusion part drawing was determined.Based on the establishment of simplified model,the flow law of metal during isothermal extrusion was analysed by the way of three dimensional finite element numerical simulation software DEFORM.First of all,the influence of diffrent blank shape on the forming result was disscused,and the prefabricated blank plan of extruded the round bar to fan-shape before anti-extrusion was proposed.Based on it the paper analysis the influences by the the different distortion temperature,the strain rate and the friction condition to the metal equivalent strain and the load-stroke curve,which promotes the technological parameter reference for the magnesium alloy fan-shaped shell forming.The simulation reseach showed that:when the temperature is about 380℃,the friction factor is 0.1,and the extrusion speed is10mm/s,the formability is good.According to the above results,the mould was designed and optimized,and the experimental reseach was carried on.The result showed that:developed process plan was feasible,designed mould was appropriately applied,metal flow was uniform,and product accuracy and surface roughness all meet the technical requirements of non-processing,the material utilization increased from less than 30% to 67%,and the economic benefit was high,which laid the foundation for engineering applications of the similar parts.