Study On Finite Element Simulation And Experiment Of The Cutting Process For Ni₃Al Based High-Temperature Material

High-temperature material is used as the main materials for the high temperature parts of the aircraft engine, but its effectively machining has always been one of the difficult problems. The target of the study is a new Ni₃Al based high-temperature material. It’s used as the material for the high temperature parts of new aircraft engine, with excellent thermal stability, high temperature strength and high temperature performance. This study applies the numerical simulation approach, combining the theoretical analysis and cutting process experiments, and focus on studying the cutting process of Ni₃Al based high-temperature material. The main research work is as follows:（1） Some critical issues involved in the finite element simulation during cutting process of Ni₃Al based high-temperature material are investigated. An algorithm for identifying parameters in JohnsonCook constitutive model is provided, by which the parameters in Johnson-Cook constitutive model during cutting process of Ni₃Al based high-temperature material are identified.（2） Comparative analysis of chip formation by using Adaptive Lagrangian-Eulerian（ALE） modeling method and that by using modeling method with separation line based on ABAQUS software; accordingly, the finite element stimulation models during orthogonal cutting process of Ni₃Al based high-temperature material, e.g., K313 with carbide tools is established using the latter modeling method. Orthogonal cutting experiments of Ni₃Al based high-temperature material K313 are conducted. The cutting force and temperature are measured and compared with that obtained in the finite element simulation. Then, the difference between the measured values with the simulated ones is discussed.（3） The formation mechanism of serrated chip during cutting process of Ni₃Al based hightemperature material are researched based on the established finite element simulation model. The force variation and temperature distribution during cutting process are detected. The effects of the cutting parameters on the cutting force and temperature and chip morphology are explored, which could provide a reference for selecting of cutting speed and depth of cut during cutting process of Ni₃Al based hightemperature material.