Abstract: In view of the slender structural characteristics of titanium alloy wire coil as raw materials for aviation fasteners and the machining difficulties, a centerless lathe was used to finish the surfaces of titanium alloy wire coil. Considering the requirements of high precision surface quality after turning, in order to improve the machining stability of centerless lathe, a multi-degree-of-freedom coupled flutter vibration mechanics model was established considering process damping effect. By solving the model and drawing the stability lobe diagram of the cutter head cutting system of centerless lathe for stability analysis, the stable machinable parameter group was obained. Further analysis of the influences of tool structure parameters shows that when the radius of the tool nose is as 0.1~0.3 mm, the rake angle of the tool is as 1°~2°, and the clearance angle of the tool is as 2°~5°, the stable machinable parameter set with the highest design safety may be obtained. The experimental platform was set up to verify the theoretical analysis results, and the obtained tool structure parameter selection domain and stable machinable parameter set may provide a reference for surface finishing of titanium alloy wire coils.

Key words: centerless lathe, turning finishing process, stable machinable parameter set, tool structure parameter selection domain

摘要： 针对航空紧固件原材料钛合金丝材盘圆细长结构特性和加工难度大的问题，采用无心车床进行钛合金丝材盘圆的表面车削精整加工。考虑车削后高精度表面质量的要求，为提高无心车床的加工稳定性，建立考虑过程阻尼效应的多自由度耦合颤振动力学模型。通过对模型求解，绘制无心车床刀盘切削系统稳定性叶瓣图进行稳定性分析,得到稳定可加工参数组。进一步分析刀具结构参数的影响，刀尖圆弧半径为0.1~0.3 mm、刀具前角为1°~2°和刀具后角为2°~5°时，可以获得设计安全性最高的稳定可加工参数组。通过搭建试验平台验证理论分析结论，所得到的刀具结构参数选择域和稳定可加工参数组可为钛合金丝材盘圆的表面精整加工提供参考。

关键词: 无心车床, 车削精整加工, 稳定可加工参数组, 刀具结构参数选择域