铝车轮旋压模具设计的热膨胀系数确定

Determinations of thermal expansion coefficient of spinning die design for aluminum alloy wheels

铝车轮旋压模具的首选材料为H13钢,H13钢价格较高,为了降低模具的制造成本,在不影响旋压模具强度和硬度的前提下,旋压模具材料选用5CrMnMo钢,变更后的旋压模具热膨胀系数与H13钢的热膨胀系数存在差别,影响了旋压模具与毛坯的配合。为了重新制定旋压模具设计的热膨胀系数,对5CrMnMo钢旋压模具进行了物理试验和数值模拟分析,确定了旋压模具设计的热膨胀系数。试验结果表明:模具材料选用5CrMnMo钢后,模具的热膨胀系数定为1.0064较为合理,可以大大降低车轮变形程度,提高材料利用率。

Steel H13 with higher price is used for aluminum wheel spinning die.In order to reduce the cost of die and on the premise of not affecting the strength and hardness of spinning die, 5CrMnMo steel was selected as spinning die material. The thermal expansion coefficients of spinning die for 5CrMnMo and steel H13 are different,which affects the cooperation between spinning die and blank. In order to redesign the thermal expansion coefficient of spinning die, physical test and numerical simulation analysis for 5CrMnMo steel of spinning die were conducted,and the thermal expansion coefficient of spinning die was determined. The results show that the mold thermal expansion coefficient of 1.0064 is more reasonable when using 5CrMnMo steel for die material, with which the wheel distortion is significantly reduced and the material utilization is increased.