摘要：以液氮作为冷却介质，对难加工材料Ti6Al4V钛合金进行了大进给铣削试验。研究分析了刀具耐用度、刀具磨损区的宏观形态与微观形态，并与干铣削进行了对比分析。研究结果表明：相对于干切削，液氮冷却下超低温、大进给铣削Ti6Al4V钛合金可以减缓热裂纹的产生，显著提升刀具耐用度；两种冷却润滑条件下的刀具使用寿命主要由沟槽磨损决定。

关键词：Ti6Al4V钛合金；大进给铣削；刀具磨损；超低温切削；液氮冷却

中图分类号：TG506；TH161文献标志码：A

Experimental Study on Tool Wear in Cryogenic High Feed Milling of Ti6Al4V

Xu Qing，Ren Fei，Zhao Wei，Li Liang，He Ning，Gong Le

Abstract:In this study，liquid nitrogen is used as coolant in high feed milling of Ti6Al4V.Tool wears are studied with analysis of tool durability，macroanalysis and microanalysis method.The results show that the generation of thermal cracking can be slowed down and tool life can be improved remarkably in cryogenic compared with dry milling.Tool life is determined by main type of notch wear in cooling condition.

Keywords:Ti6Al4V；high feed milling；tool wear；cryogenic machining；liquid nitrogen