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采用Gleeble 3800热模拟试验机对液相线铸造获得的ZL201合金半固态坯料进行了不同工艺参数下的热模拟试验,并进行了变形抗力本构方程拟合,以此为基础根据Stefan方程确定了幂律模型中的表观粘度等参数.采用商用仿真软件ANYCASTING对汽车发动机支架进行了触变压铸过程数值模拟分析,获得了ZL201合金的半固态充填流动特征响应.结果表明:半固态表观粘度随剪切速率增大而下降,在充型过程中呈现剪切变稀的触变成形特点,半固态浆料将以层流方式充填型腔,可获得充型完好的半固态压铸零件.
The thermal simulations under different technological parameters of ZL201 alloy semi-solid billet obtained by liquidus casting were carried out by Gleeble 3800 thermal simulation test machine, and the constitutive equation of deformation resistance was fitted. Based on this, the Stefan equation was used to determine Exponential viscosity and other parameters in the power-law model.The numerical simulation of the thixoforming process of automobile engine brackets was carried out by the commercial simulation software ANYCASTING, and the semi-solid filling flow characteristic response of ZL201 alloy was obtained.The results showed that the semi-solid apparent viscosity As the shear rate increases and decreases, thixoforming features of shearing and thinning appear during the filling process. The semi-solid slurry will fill the cavity in a laminar flow manner to obtain a fully-filled, semi-solid die-cast part.