采用等温成形工艺,制作了一种大型车用铝合金轮辋。成形过程中,坯料和模具始终保持相同温度和恒定的应变速率,避免了坯料在变形过程中温度的降低和冷模效应;采用穿孔挤压工艺,预制管料坯,通过多次反挤压达到构件要求的变形量,大幅度降低了成形力,消除了轮辋内部的裂纹缺陷。 Using isothermal forming process, produced a large car with aluminum alloy rims. In the process of forming, the billet and the mold keep the same temperature and constant strain rate all the time, avoiding the decrease of the temperature and the cold-mold effect during the deformation of the billet. The perforation extrusion process is adopted to preform the tube blank, The required amount of deformation of the component significantly reduces the forming force and eliminates the flaw inside the rim.