损伤容限型钛合金正交车铣切削温度研究

Research of Cutting Temperature in Orthogonal Turn-milling for Damage-tolerant Titanium Alloy

损伤容限型TC21钛合金具有优良的力学性能和工艺性能,主要应用于航空航天重要的承力构件,但TC21较小的导热系数使其车削时产生较高的切削温度,从而加剧刀具磨损和降低加工质量。采用正交车铣对TC21进行切削试验,设计了一种新的正交车铣测温方法,对比TC21车削和正交车铣的切削温度,分析车铣切削参数对切削温度的影响规律,采用扫描电镜(SEM)验证了高切削温度导致的热冲击不是造成车铣刀具破损的主因。该研究为合理优化正交车铣的切削参数提供了理论依据。

The damage-tolerant titanium TC21 is widely used in some key components of aeronautics and astronautics industries because of its excellent mechanical and process properties.The low material thermal conductivity of TC21 will cause high cutting temperature in turning that exacerbate tool wear and reduce processing quality.In this work,orthogonal turn-milling is used to cut TC21,a new measuring method of cutting temperature in orthogonal turn-milling is designed,cutting temperatures of turning and orthogonal turn-milling are compared,and the influence rules of cutting parameters in turn-milling on cutting temperature are analyzed.A scanning electron microscopic image is used to validate that thermal shock caused by high cutting temperature is the main cause of tool wear in turn-milling.The researches offer a theoretical guidance for the optimization of cutting parameters in orthogonal turn-milling.