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钛合金高速铣削以高效率、高质量的优点广泛应用于航空航天行业。针对高速铣削中表面粗糙度的工艺控制,提出了基于表面粗糙度经验模型的工艺参数灵敏度和相对灵敏度概念。通过高速端面铣削正交试验,建立了面向表面粗糙度的工艺参数灵敏度和相对灵敏度数学模型,研究了工艺参数区间敏感性分析方法,给出了工艺参数稳定域和非稳定域的划分原则和方法。结合正交试验法中的极差分析方法获得了不同切削工艺参数对表面粗糙度的影响曲线,提出了工艺参数区间的优选方法。研究结果表明:TC11钛合金高速铣削时,表面粗糙度对铣削速度的变化最为敏感,对每齿进给量变化敏感次之,对铣削宽度和铣削深度的变化不敏感;铣削速度优选在314～377m/min范围,每齿进给量优选在0.03～0.05mm/z范围,可控制表面粗糙度在0.6μm以内。为优化钛合金材料高速铣削工艺以及进行表面粗糙度控制研究提供理论方法和试验依据。
Titanium high-speed milling with high efficiency, high quality advantages are widely used in the aerospace industry. Aiming at the process control of surface roughness in high-speed milling, a concept of process parameter sensitivity and relative sensitivity based on surface roughness empirical model is proposed. Through the orthogonal experiment of high speed face milling, a mathematical model of process parameter sensitivity and relative sensitivity for surface roughness was established. The method of interval sensitivity analysis of process parameters was studied. The principle and method of dividing the stable and unsteady fields of process parameters . Combined with the range analysis method in orthogonal test, the influence curve of different cutting process parameters on the surface roughness was obtained, and the preferred method of process parameter interval was proposed. The results show that the surface roughness of the TC11 titanium alloy is the most sensitive to the change of the milling speed and the second is sensitive to the change of the feed per tooth, which is insensitive to the change of milling width and milling depth. 377m / min range, feed per tooth is preferably in the range of 0.03 ~ 0.05mm / z, the surface roughness can be controlled within 0.6μm. To provide theoretical and experimental basis for the optimization of high speed milling technology of titanium alloy and the research of surface roughness control.