数控凸轮轴磨床颤振稳定性研究

Study on Cutting Chatter Stability of a Computerized Numerical Control Camshaft Grinder

在凸轮轴磨床的磨削过程中,颤振现象严重影响凸轮轴表面的磨削质量.为了抑制凸轮轴磨削颤振的产生,基于再生颤振理论和随动磨削的特点,建立了凸轮轴和砂轮再生激励效应的动力学模型,绘制了稳定性极限图,同时研究了凸轮轴磨床的颤振稳定性.通过凸轮轴磨床的颤振实验,利用频域和时频域方法分析了凸轮轴磨床的振动特性.颤振实验结果和稳定性极限图预测结果一致,验证了凸轮轴磨床再生颤振动力学模型的正确性和预测颤振产生与优选加工参数的可行性.

The chatter in the follow-up grinding process will affect the quality of camshaft grinding.In order to suppressing chatter,the regenerative chatter model of follow-up grinding based on regenerative chatter theory and the characteristics of follow-up grinding was built,considering the regenerative chatter of both camshaft and grinding wheel.Based on the regenerative chatter model,the stability limit diagram was portrayed to study the regenerative chatter stability of the follow-up grinding.The grinding tests on the camshaft grinding machine were carried out to verify this model.The vibration features of the grinding machine were inspected in both frequency domain and time-frequency domain,and the results agreed well with the stability limit diagram.It testified the regenerative chatter model and feasibility of the chatter predicting and the machining parameters'optimizing by stability limit diagram.