Experimental Study On Life Reliability Of Coated Carbide Tools For Cutting Superalloy Inconel625

In recent years,nickel-based superalloy has been widely applied to aircraft engine disk shaft parts because of its excellent properties.However,it has become a typical difficult-to-machine material because of its poor thermal conductivity,high hardness,cohesiveness.Processing of Engine parts demands high reliability and stability of the process and tool parameters.Therefore,coating cemented carbide cutting tool parameter optimization and reliability life is becoming more and more attention.In view of the above requirements,in this paper,the high temperature alloy Inconel625 is tested by using coated carbide cutting tools to analyze the wear form and mechanism of the cutter under different parameters.On the basis of the relationship between cutting parameters and wear characteristics,the failure boundary of two-dimensional tool based on hot-mechanical loading is constructed.Considering the influence of sawtooth chips on tool wear and surface quality,the mechanism of sawtooth chip formation is theoretically analyzed.The relationship between chip sawing and cutting parameters is obtained through experiments,which provides a theoretical basis for chip controlled.Aiming at the longest life finally complete life test for the optimal parameters,the life reliability function was established.Analyzing and evaluating the life reliability in order to providing theoretical basis for actual machining tool change strategy.The coated carbide cutting tools are used to cut the superalloy Inconel625 in different cutting parameters.Tool rake face morphology was observed with a microscope,Micro-rake face wear morphology was observed using a scanning electron microscope(SEM),EDS is used to perform elemental inspection on the worn area of the rake face.Detection of rake wear characteristics used to determine the tool rake wear morphology,mechanism and the relationship between cutting parameters,mechanism and cutting parameters.Detection of flank wear characteristics used to determine the tool flank wear morphology,mechanism and the relationship between cutting parameters,mechanism and cutting parameters.The effect of flank wear controlled by controlling the cutting time on machined surface quality was analyzed.The formation mechanism of sawtooth chip is theoretically analyzed.The relationship between chip sawing degree and cutting parameters is also studied experimentally.According to the relationship between cutting parameters and cutting tool failure forms,the failure boundary of 2D cutting tools based on thermal-mechanical load is built,a secure cutting area is defined,failure forms easily caused by different cutting parameters and main wear mechanisms are plotted in 2D failure boundary graph.The element diffusion behavior between coated cemented carbide tool and superalloy Incone625 was analyzed in Static Environment,Diffusion line are plotted in 2D failure boundary graph.By studying the influence of cutting parameters on surface quality and flank wear,under the premise of ensuring the surface quality,combining with actual machining parameters,the cutting parameters are optimized for the maximum tool life of the 2D tool failure boundary to complete life experiment.The experimental results were fitted using SPSS software,tool life distribution model and the tool life reliability model are established.Tool life reliability is analyzed and evaluated.