基于加工误差及装配变形的滚轮配合尺寸设计

Design of roller fitting dimension based on mismaching tolerance and assembly deformation

针对某柴油机样机台架考核试验过程中出现的滚轮运动卡滞现象,从装配工艺和零件加工误差两方面着手,利用有限元软件ANSYS的结构、热分析功能,进行冷装配及温差法装配工艺引起滚轮销变形量的计算,同时考虑各零件配合部位的形位公差及加工误差。经综合对比分析,提出了滚轮销变形是导致滚轮运动卡滞的根本原因,调整零件配合部位的设计尺寸及公差可以解决滚轮运动卡滞的问题,而选用温差法装配工艺对减小滚轮销变形效果明显。

By using the structural and thermal analysis function of finite element software ANSYS, the penomenon that distribution roller rotate clamping stagnation occurred in the rig-test of some diesel engine was analysised comprehensively. After comparing the deformation of roller-pin caused by different assembly methods and considering the tolerance of shape and position of components, the opinion that deformation caused by assembly is the main factor that led to the roller rotate clamping stagnation was put forward. It also suggested that the clamping stagnation problem would be solved by adjusting the design fit dimensions of parts, and deformation of the roller pin would be reduced sharply by choosing the temperature difference assmble technology