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车轮用高强钢回弹大、成形难度大,对零件性能影响大。选用15X6车轮研究了回弹角度对疲劳性能的影响,发现轮辐冲压后接合面回弹角度为4°,装配后轮毂的疲劳寿命达不到设计要求。采用数值模拟方法,建立有限元模型分析了不同回弹角度对高强钢轮毂过盈配合的影响,发现回弹角度为4°时,轮辋和轮辐配合面有间隙,且出现应力集中,回弹角度小于2°后消除。设计整形模具对轮辐进行整形,降低回弹角为2°,与轮辋配合疲劳寿命达到了设计要求。
Wheel rebound with high strength steel, forming a large degree of difficulty, the impact on the performance of parts. The effect of rebound angle on fatigue performance was studied by using 15X6 wheels. It was found that the rebound angle of the joint surface after the spoke stamping was 4 °, and the fatigue life of the hub after assembly failed to meet the design requirements. The influence of different rebound angles on the interference fit of high strength steel hub was analyzed by numerical simulation. The results show that when the rebound angle is 4 °, there is a gap between the rim and spoke interface, and the stress concentration and rebound angle Less than 2 ° after the elimination. The plastic mold is designed to shape the spokes to reduce the bounce angle to 2 °, and the fatigue life matched with the rim meets the design requirements.