The simulation of forging flow lines for aluminum alloy wheel-hub was carried out on the condition of different process parameters by using software platform Deform 2D. The experiment of forging process for reduced-scale wheel-hub was performed to verify the simulation results. The results show that a proper increase of friction between the mould and billet contributes to reduction of the angle between flow lines and workpiece surface, and prevention of flow lines outcrop. In comparison with the hot die forging, due to higher temperature and lower velocity in isothermal die forging with the temperature of the billet and models 450 ℃ and the velocity 0.1 mm/s, the metal strain resistance is reduced greatly, and the flowability of metal in the mould is improved. Therefore, the reasonable flow lines and uniform fine grain are obtained and the defects such as forging cracks and underfill occurring in hot die forging can be avoided.%采用Deform 2D软件对铝合金机轮轮毂在不同工艺参数下的锻造流线进行仿真分析,并通过机轮轮毂缩比件锻压工艺实验研究对仿真结果进行验证.研究结果表明:适当增大坯料与模具之间的摩擦,可减小流线与锻件表面夹角,避免流线露头；与常规热模锻工艺相比,等温模锻工艺(模具温度和坯料温度均为450℃,压制速度为0.1 mm/s)在较高的温度和较低的变形速率下,可有效降低材料的变形抗力,增强材料在模腔中的流动性,成形的机轮轮毂流线分布合理,晶粒细小均匀,避免了热模锻过程中易产生裂纹、充填不满等缺陷.
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