Study On Numerical Simulation Of AZ31 Magnesium Alloy Cycling Crank Isothermal Closed-die Forging

In the process when the bicycle enterprise are pursuing product lightweight magnesium alloy gradually receives the manufacturer and consumer's favor because of its outstanding specific tenacity and compared to the rigidity. Furthermore the magnesium alloy that applied on the bicycle also has other unique outstanding performance:â‘ Prominent character that hasn't the memory of wearily;â‘¡Good dynamics performance;â‘¢Better carrying capacity compareed to the plastic parts;â‘£Better antivibration characteristic compared to the metal parts such as steel and aluminum;â‘¥Easy to be recycled.Magnesium is the lightest commercial construction metals being used in practice at present. At the same time,magnesium alloys have lower density, the highest strength to weigh ratio, good thermal conductivity , electrical conductivity, damping capacity, and good electromagnetic interference shielding property, the property of being easy to manufacture and recyclable. The magnesium alloy has a narrow forging temperature rang , but it has a high thermal conductivity which is about twice more than steel. Therefore we generally choose isothermal forging method for magnesium alloy.In this paper,using the finite element numerical simulation soft DEFORM-3D, simulate the forming processes of crank forge piece, According the numerical simulation rusults, bring foreword influence crank shape's processes parameters, analysis and study some mostly influence factor of forging part shaping rule, optimize and gain possibility forge up to qualified forging part's processes and die parameters. The result plays guidance to the production of crank forge piece. The actual content is as follows:(1) Introduced the magnesium alloy forging and its domestic and foreign present research situation, gave some elaborate introductions on the isothermal forging and precision forging craft characters of the magnesium alloy. (2) Introduced the rigid-plastic finite element method and critical technical in the numerical simulation of forging forming. through the UG software, designed the forging and die's 3D model, established AZ31 magnesium alloy material model. provided the finite element model for the following simulation and analysis.(3) Using the numerical simulation software DEFORM-3D, Carried on the numerical simulation of the forming process, in-depth and meticulous analyzed the flow pattern of the metal in the forming process, obtained the distributive rule of the corresponding speed, stress, strain and curve of load-distance, understood the general rule of the metal in the forming process of the crank. Established the different models and has carried on the numerical simulations using the main formed parameter. Inspected the influence that the formed parameters such as working temperature, working speed and lubrication to the distortion.(4) Calculated die forging process technological parameter of the bicycle crank, determined the technical process of the crank and the specification of the semifinished materials and designed the model designed the heat device and hydraulic jacking equipment of the isothermal forging.