高速切削钛合金稳定性模型及极限切深预测

Stability Model and Depth Limit Prediction of Titanium Alloy Using High-Speed Machining

针对TC4钛合金高速加工过程中颤振及切削稳定性问题进行了研究。首先根据闭环加工系统的动力学模型,建立了高速切削过程的稳定性模型,并通过解析计算的方法得到了加工过程中稳定切削极限深度与转速之间的关系。然后采用力锤敲击方法获取了刀具的频响函数,为切削稳定性模型的建立奠定了基础,最后采用切削实验验证了模型的准确性。结果表明:采用高速切削方式加工TC4钛合金能更好的避免加工过程的颤振现象,建立的稳定模型能很好地预测加工过程的稳定性。

Chatter and cutting stability of high-speed processing of titanium alloy TC4 were studied. Firstly, according to the dynamic model of the closed-loop manufacturing system, a stable model for high-speed cutting process was established, and an analytical method was presented based on the relationship between the depth and the speed limit in stable cutting process. Then, hammer impacting method was used to obtain the frequency response function of the tool for the modeling of cutting stability. Finally, the cutting experiment was preformed to verify the accuracy of the model. The results show that the highspeed cutting was a good way to machine TC4 titanium to avoid the chatter, and stable model presented can well predict the stability of the machining process.