高速铣削近α钛合金的切削温度研究

切削温度不仅直接影响刀具的磨损和耐用度,而且也影响工件的加工精度和已加工表面质量。由于钛合金导热性差和化学亲和性强等原因,通常在其切削加工时切削温度高、刀具磨损严重,致使切削速度难以进一步提高。本文重点对钛合金高速铣削时的切削温度进行试验研究,阐明夹丝半人工热电偶法测温原理和所测热电势信号的物理意义。试验选用了3种不同类型的硬质合金刀具,系统地研究了切削用量、冷却条件及刀具磨损等因素对近α钛合金高速铣削时切削温度的影响。

Study of Cutting Temperature in High-speed Milling of a Close Alpha Titanium Alloy

Cutting temperature has direct effects on not only tool wear and tool life but also machining accuracy and quality of machined surfaces.Titanium alloys,however,are generally machined at lower cutting speeds with cemented carbide tools due to their low thermal conductivity and high chemical reactivity with cutting tool materials.This paper dealt with cutting temperature in high-speed milling of a close alpha titanium alloy.The principle for measuring cutting temperature by the tool-work thermocouple method and the physical meaning of electromotive force(EMF) signals were described.Three kinds of carbide tools were used in the experimental research.The effects of cutting quantity,wear status and cooling conditions on cutting temperature were studied systematically in high-speed milling of the titanium alloy.