中文摘要：

针对航天发动机叶轮零件轻量化用Ti2AlNb基合金的高效切削加工需求,分别选择通用牌号YG类硬质合金刀具和复合Si3N4陶瓷刀具进行了刀具耐用度对比试验,分析了陶瓷刀具前、后刀面的磨破损失效形态和材料的切削加工性;通过正交试验研究了切削表面粗糙度随切削速度、进给量、切削深度的变化规律,建立了表面粗糙度的特征曲面。结果表明,复合Si3N4陶瓷刀具对于Ti2AlNb基合金的切削性能有了大幅度的提高,能够获得相对稳定的刀具耐用度,其正常切削阶段的磨损主要由较高的切削温度引起,为合理选取切削刀具和工艺参数提供了试验依据。

英文摘要：

With regard to the high efficiency cutting demand of Ti2A1Nb based alloy which is used for the lightweight of impeller in aerospace engine, cutting tool life experiments were carried out with YG cemen- ted carbide and Si3 N4 composite ceramic cutting tool respectively, the characteristic of wear and broken in rake and rear face of ceramic cutting tool and the machinability of the alloy were analyzed. Furthermore, the relationship of cutting surface roughness and cutting speed, feed rate, cutting depth, as well as the response surface and contour map of surface roughness were established through orthogonal experiment. The results show that the cutting performance of Si3N4 composite ceramic cutting tool for Ti2A1Nb based alloy was improved greatly and the stable cutting life was obtained, while the wear is mainly caused by high cutting temperature. As the conclusion, the results can be used as the optimal selection of cutting tool and process parameters.