翻板卧式加工中心铣削颤振稳定性的影响因素研究

Influence factors of chatter stability in milling on turn-table horizontal machining center

以某翻板卧式加工中心为研究对象,基于铣削颤振稳定性叶瓣图理论,通过实验与仿真结合的方法得到机床铣削稳定性的影响因素及变化规律,为工程人员提供参考。首先通过敲击实验获取刀尖点频响函数,再通过ANSYS Workbench中使用虚拟材料轴承的谐响应仿真获取频响函数,对比实验与仿真的结果,得到刀尖频响函数的影响因素。再由刀尖频响函数绘制铣削颤振稳定性叶瓣图,进而得到机床铣削稳定性的影响因素。研究结果表明,机床铣削稳定性几乎不随主轴位置移动而变化,不同刀具的铣削稳定性变化规律及其适宜铣削转速与不宜铣削转速相同,可在工艺设计、机床电主轴选型及电主轴结构设计等方面为工程人员提供帮助。

This paper mainly study one turn-table horizontal machining center.The influence factors of chatter stability in milling is obtained by combination of experiment and simulation based on the theory of chatter stability lobes in milling,which can be used as a reference for engineers.The influence factors frequency response function of the tool nose is obtained by both impact test on the machine and harmonic response simulation in ANSYS Workbench using virtual material bearing,which then be used to draw the chatter stability lobes of the machine.Furthermore,the influence factors of chatter stability in milling is obtained.The results show that stability in milling has no variation while spindle moving and different tools have the same suitable spindle speed,unsuitable spindle speed and variation law of stability.This conclusion can be used as a reference for machining process design,selection of electric spindle and electric spindle design.