基于Simufact变薄拉深滑动轴承的尺寸精度研究

Research on dimensional accuracy of ironing sliding bearing based on Simufact

为得到较高尺寸精度的滑动轴承,利用有限元数值模拟方法,对滑动轴承的2种变薄拉深成形工艺进行分析,使用锡青铜为加工材料,在Simufact有限元仿真软件中,当减薄率相同时,对同一毛坯的1次变薄拉深成形与3次连续变薄拉深成形分别进行数值模拟。以变薄拉深后滑动轴承成形件的尺寸精度（扩径量、圆度误差、直线度误差）与材料利用率（喇叭口长度）为评价指标,选取最佳成形工艺,并对仿真可靠性进行试验验证。结果表明,锡青铜材料1次成形的内径扩径量、外圆度误差与内轴线误差较大,外轴线直线度误差较小,且材料利用率高,为实际生产的工艺选取提供理论依据。

In order to get the sliding bearing with high-level dimensional accuracy,two kinds of ironing process for sliding bearing were analyzed by using the method of finite element numerical simulation,and one ironing and three consecutive ironing of the same blank were numerically simulated respectively with the tin bronze as the processing material in Simufact finite element simulation software when the reduction ratio was the same. With dimensional accuracy(expansion of diameter,roundness error and straightness error） of sliding bearing after ironing and the material utilization(bell mouth length） as evaluation indexes,the best forming process was selected and the reliability of simulation was verified by test. The results show that for the tin bronze material,the expansion amount diameter,external roundness error and straightness error of inner axis for one-time ironing is relatively larger,but the straightness error of outer axis for one-time ironing is relatively smaller,and the material utilization rate is also relatively higher,which provides a theoretical basis for the selection of actual production process.