Effect Of The Shot Sleeve Temperature Field Simulation And Die Casting Processing Parameters On Heat Treatment Of A380 Aluminum Alloy

Nowadays, the usage of steels on vehicle parts has been taking place by die casting aluminum alloys world widely with high strength and hardness, long life span and good service performance. This project will be a key problem for us to solve in future. Considering the problem of low strength and toughness of die casting aluminum produced now, the die casting forming technology of the A380.0 die casting alloy and heat treatment of die-castings was studied in this paper.On the basis of optimization of die cast parameters, the study was mainly focused on the effect of die casting on microstructure and mechanical property of A380.0 alloy. Then the microstructure, hardness, tensile strength, impact toughness and elongation of die castings were measured. The optimal shot velocity was achieved. The result show that shot velocity makes a finer microstructure and change the distribution of intermetallic compound and enhance mechanical property. Low shot velocity for die casting A380.0 alloy can increase strength and elongating more than 31MPa and 1.91%. The impact toughness and hardness is more than 23.5J/cm~2 and 83.16HB. The non-dendrite microstructure of die castings is responsible for the difference of mechanical properties. The effect of die casting on microstructure and mechanical property of A380.0 alloy was studied further. Die castings were aged treatment under different conditions. Then the microstructure, tensile strength and elongation of die castings were measured. The results show that low temperature aging treatment make a finer microstructure and change the distribution of intermetallic compound and enhance mechanical property. Low temperature aging for die casting A380.0 alloy can increase strength and elongating more than 23Mpa, 27 Mpa and 0.97%, 1.4%. The optimal aging treatment is 180℃×15h.The finite element mould of the die-casting Aluminum alloy was established and the initial conditions and boundary conditions were determined. Combine with the nonlinear thermo-physics parameters of material, temperature field distribution in the solidification process of A380.0 alloy die casting has been simulated by ANSYS software, and the relationship between temperature of casting and time is obtained. The simulation result has reflected the temperature change in the casting process. The result shows the finite element analysis software ANSYS has quick computing speed and well simulation result, which give a reference for optimization design of thermal stress distribution and die-casting.