刀具表面微织构对刀—屑界面特性的影响研究

2018-10-19

作者：逄明华，马利杰单位：河南科技学院

摘要：刀—屑界面的剧烈摩擦和高温会导致刀具快速磨损和加工效率低下。微织构作为用于刀具表面改善刀—屑界面特性和提高金属切削性能的一种方法，经证明效果明显。目前，关于微织构对刀—屑界面特性的影响机理及量化关系的研究较少，刀具微织构技术发展缓慢。本文利用激光打标机在刀具表面加工出不同参数的微织构，通过金属切削试验和理论模型解析，得到微织构刀具对刀—屑界面摩擦特性、刀—屑接触长度和刀—屑界面应力场等的影响关系。研究结果表明：刀具表面微织构降低了刀—屑界面的摩擦系数，减小了刀—屑接触和粘结区长度，改变了切削刃处的正应力和刀具表面应力场，为刀具表面微织构的研究和设计提供理论参考。

关键词：表面微织构；刀—屑界面；摩擦特性；金属切削

中图分类号：TG501；TH121文献标志码：A

Study of Cutting Tool Surface Microtexture on Tooltip Interface Characteristics

Pang Minghua，Ma Lijie

Abstract:The interface occurring in the toolchip and toolworkpiece play an important role in controlling the type of chip and the quality of workpiece and tool wear.Microtexture technology as a method of improving the interfacial characterization of toolchip had been used in cutting tools，but the principle and quantitative relation of it are still unknown at present.The characterization of toolchip interface such as friction coefficient and toolchip contact length and toolchip interface stress field are got with cutting test and analytical model in which the microtexture tool with five parameters are used.It can be concluded that the reduced trend appeared in the toolchip interface contact length and friction coefficient with microtexture tool.The increased trend appeared in the normal stress on cutting edge.The study results provides theoretic support for microtexture tools design and research.

Keywords:surface microtexture；toolchip interface；tribological characteristic；metal cutting