曲柄半径误差建模及影响因素研究

Research on Error Modeling and Influence Factors of Crank Radius

结合曲轴在加工过程中的综合受力,利用有限元仿真方法对曲轴各轴颈轴线在加工过程中的弹性变形进行了研究。根据随动磨削中曲轴及砂轮的运动情况,建立了曲轴曲柄半径误差分析模型,并通过MATLAB软件分析曲轴受力变化与曲轴曲柄半径缸间差异之间的影响关系。理论表明,增大顶尖力或减小磨削力有利于减小曲柄半径缸间差异。最后,通过验证实验证明了曲柄半径误差分析模型及理论分析的正确性。同时,考虑到磨削力变化对曲轴轴颈表面质量的影响,优先选择优化顶尖力以降低缸间差异的方法。

Combining with the forces of crankshaft in the machining process,the elastic deformation in machining of crankshaft journal axis has been studied with the finite element analysis. According to the motions of the crankshaft and grinding wheels,an error analysis model on crank radius of crankshaft has been built.And the relationship between the change of force on crankshaft and the maximum difference between the four crank radiuses has been studied with MATLAB. The conclusion indicates that both the increase of the top force and the decrease of the grinding force can reduce the maximum difference between the four crank radiuses. Finally,the model and the theoretical calculation results are validated by the experiment. At the same time,considering the influence of the chance of grinding force on the surface quality of crankshaft,the scheme of optimizing the top force should be the first choice.