宽温域油附三态水雾切削难加工材料屑-刀-工双界面摩擦力学行为研究

本项目属于面向环境友好、多学科交叉的前沿性课题。在宽温域（150℃～-30℃）油附三态水雾（过热水蒸气+油雾（150℃）、常温水雾+油雾（20℃）、低温水雾+油雾（-30℃））介质环境下，通过使用硬质合金、陶瓷、聚晶立方氮化硼刀具对S类难加工材料镍基高温合金钢的车削试验，结合高温摩擦磨损与霍普金森等试验，采用宏观测试、微观分析及有限元仿真等方法，系统研究屑-刀-工双界面的摩擦力学行为。理论上解决：（1）油附三态水雾（油附气态水雾、油附液态水雾、油附凝华水雾）的热对流模型及冷却、润滑机理，屑-刀-工双界面正应力、切应力、摩擦因数的分布函数及其摩擦力学模型；（2）刀具前后刀面的摩擦特性、磨损机理，刀具磨损区热力多因素耦合作用下裂纹萌生、扩展规律及机理；（3）刀-屑界面力学行为对已加工表面显微硬度、残余应力、微观组织的作用机制。该研究对创新绿色切削技术理论，促进其在生产中的应用具有重要意义。

This is an environment friendly and multidisciplinary advanced project. In this project, experimental investigations in turning of the S class difficult-to-cut material nickel base high temperature alloy steel with oils on three states of water mist at wide temperature range (high temperature steam+oil mist (150℃), normal temperature water mist+oil mist (20℃), and low temperature water mist+oil mist (-30℃)) as coolants and lubricants are conducted with the carbide, ceramic, and PCBN cutting tool. The tribological behavior is investigated systematically by utilizing the friction-wear，Hopkinson, etc. tests at high temperature levels, and macroscopic and microscopic analysis and finite element simulation methods. The problems solved in theory are as follows: (1) the model of heat transfer and the cooling and lubrication mechanisms of oils on three states of water mist (oils on vaporizated water, liquid water mist, and desublimated water mist); the distribution function of the normal stress , shear stress, and friction coefficient; the tribology model at chip-tool-workpiece interfaces; (2) the frictional characteristic and wear mechanisms of the rake and flank face of cutting tool; the laws and mechanisms of the crack initiation and propagation in the tool worn zone if considering the thermal-mechanical multi-factor coupling; (3) the action mechanism of the tribological behavior on the microhardness, residual stress, and microstructure. The study is of great significance in further innovating the theory of green cutting technology and accelerating application of the technology in the production.