School of Mechanical and Power Engineering,Henan Polytechnic University
Zhaogu No.2 Mine of Jiaozuo Coal Company,Henan Energy and Chemical Group

为了优化加工参数,提高航空材料的加工质量和效率,研究加工参数对分离型和不分离型垂直进给超声铣削系统稳定性的影响。以实验模态法为基础,利用非周期函数的线性化理论,建立系统的动力学模型。运用全离散法求解系统的动力学模型,获得加工参数对系统稳定性影响趋势的预测曲线,并通过铣削钛合金材料验证理论预测效果。结果表明:超声振幅变化对不分离型系统稳定性影响显著,随着超声振幅减小,系统的稳定性区域逐渐增大;随着每齿进给量增大,分离型和不分离型系统的稳定性区域整体均呈上升趋势,系统轴向切深极限值最大增幅为14.28%;超声频率和主轴转速存在最佳参数匹配,并非超声频率越大,系统稳定性就越好。实验结果和预测曲线基本吻合,验证了理论模型的正确性。

In order to improve the machining quality and efficiency of aviation materials by optimal machining parameters,the influence of machining parameters on the stability of vertical feed ultrasonic milling system was studied.Based on the experimental modal method,the dynamic model of the system was established by using the linear theory of nonlinear periodic function.The dynamic model of the system was solved by the full discrete method.Further,the prediction curve of the influence of machining parameters on the system stability was obtained.The theoretical prediction results were verified by milling titanium alloy materials.The results showed that the change of ultrasonic amplitude had a significant impact on the stability of the non-separation system.With the decrease of ultrasonic amplitude,the stability area of the system tended to in‐crease gradually.The stability area showed an upward trend as a whole and limit value of the axial cutting depth raised by 14.28 % with the increase of the feed rate per tooth in system.There was the best parametermatching between ultrasonic frequency and spindle speed. It was not that the greater the ultrasonic fre‐quency was,the better the stability of the system was. The experimental results were basically consistent with the prediction curve and the theoretical model was verified to be correct.

国家自然科学基金资助项目(52005164);河南省科技攻关项目(202102210266);河南省高等学校重点科研项目计划(21B440001,22A416005);河南理工大学博士基金资助项目(B2018-20)