Simulation Analysis And Experimental Studies On Machinability Of Nikel-Based Superalloy

Nickel-base superalloy GH4169 have a wide range of applications in aerospace, military and other fields for its high strength, fatigue resistance and stability at elevated temperatures. It is identified as one of the most difficult to machine materials because of the hard point, poor heat conductivity characteristics in the cutting process, which hindered its wider application. So researching on the machinability of nickel-based superalloy and cutting force, cutting temperature in the process, is conducive to the selection of cutting parameters and cutting tool parameters. Meanwhile, the finite element method was widely used in cutting research and cutting parameters optimization for its large reduce on research costs.Finite element simulation platform ABAQUS is used to simulate the cutting process, based on the study of metal cutting mechanism and the key technology of simulation such as material constitutive model, chip separating law, friction model. Compared the simulation results with the test results experimentally obtained. Main contents of this article include the following aspects:1. A two-dimensional orthogonal cutting finite element model (FEM) was established on the basis of the cutting simulation technology, to explore the influence of cutting speed, cutting depth and cutting tool rake angle on cutting force and cutting temperature in the process of cutting GH4169.2. A three-dimensional cutting simulation model was established to explore the effects of cutting speed on cutting process and compared the results with the two-dimensional simulation results to see the differences. A simplified model of milling was established to explore the effects of milling parameters on the milling force.3. Experimental study the process of cutting nickel-based superalloy GH4169, measured the cutting forces and temperatures in cutting process as well as the milling force in milling process. Then the simulation results were compared with the experimental results.Through the comparison and analysis of the simulation results and experimental results, the influence of cutting parameters on cutting force and cutting temperature was gained which can guide the selection of cutting parameters and geometrical parameters of tool. It has important meaning in improving cutting efficiency and quality as well as reducing processing costs. Differences between simulation results and experimental results are due to the defective material constitutive model, the simplified model and experimental error exists, but the change trend of cutting force and cutting temperature were consistent, so that cutting simulation can predict the results of the test.