【摘要】 利用三维有限元方法建立层状复合凸轮与钢管的过盈装配模型,模拟过盈装配过程中凸轮等效应力的分布规律以及不同内层材料和内层厚度对凸轮装配内应力的缓解效果,并进行实验验证。结果表明:与45#钢内层材料相比,粉末冶金材料(Fe-Cu-C)具有更好的缓解应力效果,在过盈量为0.08 mm时,复合凸轮表面应力仅为前者的38%,实验验证表面应力为前者的40%,误差仅为5%,模拟与实验结果基本一致。利用该模型对复合凸轮的层状厚度进行了优化设计,内层厚度允许范围为1.75~2.25 mm,最佳厚度为2.05 mm。更多还原

【Abstract】 Three-dimensional finite element simulation method was applied to establish the model of composite cam for interference assembling process.The equivalent stress distribution of composite cam in the assembling process was analyzed.The effects of inlayer thickness and material of inlayer on assembly stress of composite cam were discussed.Meanwhile,the experiment of assembly was performed to validate the model.Compared with 45# steel inlayer material for composite cam,powder metallurgy(Fe-Cu-C) material can preferably ease stress in the assembly process.When the magnitude of interference between the cam and tube is 0.08 mm,the surface stress for powder metallurgy(Fe-Cu-C) inlayer material is 38% of that for 45# steel inlayer material,and the result is 40% through experimental verification.It turns to be roughly accordant for data between simulation and experiment with its error of 5%.By using the model,optimization design of layer structure is processed on different thickness and the allowed thicknesses for inlayer rang from 1.75 to 2.25 mm,and the optimized thickness is 2.05 mm.更多还原