Research On Tool Wear Mechanism Of Cutting Nickel-based Superalloy Material GH4169 Based On Thermal-mechanical Coupling

In recent years,aerospace industry has developed rapidly in our country,plenty of new equipment had been producted one after another,it was an amazing feats.These success is inseparable from the day-to-day efforts of scientific research scholars,also is inextricably linked to the development of difficult-to-process materials.As a typical high-temperature alloy,nickelbased superalloys are most commonly used in parts with harsher working environments,so they are widely used in the aerospace field.However,due to the lower machinability of nickel-based superalloys,low thermal conductivity,and serious work hardening,when cutting nickel-based superalloys,the strength and hardness of the tool are not sufficient to support long time cutting.The surface is worn severely and the tool life is short,which seriously affects the surface quality of the workpiece.If the work with high accuracy requirements,you need to replace the cutting tool frequently,and the production efficiency is low.Therefore,how to process nickel-based superalloys more effectively and improve the processed quality of workpieces,attribute to the level of aerospace and popularize the application of nickel-based superalloys,still requires a lot of and long-term research.In this paper,the cutting process of cermet cutting tools for nickel-based superalloys is studied.Regarding the forces on cutting interface during the cutting process and the influence of different heat sources on the cutting temperature when cutting,a calculation model for the cutting force and cutting temperature during orthogonal cutting of nickel-based superalloys was established.According to the mechanical load and thermal load caused by the cutting force and temperature predicted by the model,the stress distribution of the tool rake face during cutting is calculated to provide theoretical support for subsequent research.The choice of cutting nickel-based alloy tools is completed by the Tribolab.Adopt the reciprocating motion module of the Tribolab,and design a special fixture to fix the cutting tools used in the experiment on the reciprocating module.Through the single factor experiment method,change the Z-direction load,reciprocating speed and the diameter of the metal ball of the upper sample,observe the wear scar depth,wear scar width,coefficient of friction,temperature of friction and the wear volume of the upper sample metal ball under different friction conditions to analyze which tool is suitable for processing nickel-based superalloys.Design turning experiments to verify the prediction model of cutting force and cutting temperature.The single factor experiment method is used,measure the values of cutting force and cutting temperature when the cutting speed and feed are changed.The results obtained through experimental measurement are compared with the prediction model mentioned above to verify the correctness of the prediction model.Finally,observe the wear form and wear mechanism of the tool under single factor experimental conditions.Observe the wear of the cutting interface of the tool under different cutting conditions through the Super Depth of Field Microscope,such as crater wear and flank wear;At the same time,under different cutting parameters,the influence of cutting temperature and cutting force on tool wear mechanism is analyzed.Analyze the cutting conditions of different wear mechanisms,and get the influence of stress distribution on wear under different cutting parameters according to the different degrees of wear.