Modeling And Analysis Of Bonding Failure Behavior Of Cemented Carbide Tools

With the development of modern industry,barrel material 2.25Cr-1Mo-0.25 V as the preferred material for hydrogenation reactor is widely used in petroleum,coal chemical industry and other industries.The cemented carbide tool has a series of advantages such as high strength,good wear resistance and certain toughness,and is one of the ideal tool materials for cutting the material of the cylinder section.In that course of the cutting,however,the tool work together due to alternating load,alternating temperature and wear.The frequent occurrence of bond tool breakage,the tool breakage is a key problem.Therefore,it is of great significance to understand the fracture mechanism of the cemented carbide,to improve the performance of the cemented carbide tools,to prolong the tool life and to improve the processing efficiency of the materials.In this paper,under the support of the State Natural Science Foundation' Study on damage Mechanism of cemented Carbide cutting tool Surface Adhesion Welding layer in heavy cutting',the breakage and failure of the carbide cutting tool for the cutting of the cylinder joints is a problem.From the angle of the theory of damage mechanics,the fatigue failure behavior of cemented carbide tools is analyzed.A test platform for bond breakage of cemented carbide cutting tools is set up.The experimental data of the cutting force and the cutting temperature of the breakage of the cutter are obtained.It is proposed that the forming conditions of the tool breakage process.Furthermore,the failure analysis and the determination of the damage form are carried out on the fracture surface of the tool.Finally,appropriate damage variables are selected.The damage evolution model of cemented carbide materials is established.It provides a theoretical basis for revealing the failure of cemented carbide cutting tools.Firstly,based on the damage mechanics,the fatigue failure behavior of cemented carbide cutting tools is analyzed.In this paper,the tool breakage phenomenon is studied in the material process of hard alloy cutter turning cylinder.An experimental platform is establish for cutting the cutting force and cutting temperature of cemented carbide cutting tools.The cutting state of tool breakage is observed by high speed camera.A blade specimen with a breakage of the cutter is obtained.Secondly,the effective cutting force and the mathematical model of cutting temperature are established by using the response surface and other experimental methods.According to the principle of metal cutting,the influence rule of cutting amount on cutting force and cutting temperature is explored.The boundary conditions of bonding damage on the rake face of the tool are presented.Finally,the typical metal fracture fracture failure morphology was observed and analyzed by scanning electron microscopy.The micromorphology of tool rake surface destruction is explained in terms of fracture nature and fracture mechanism.The damage form of cemented carbide tool is determined.Strain energy density is chosen as damage parameter based on damage type.Based on the finite element simulation software ABAQUS,the stress and strain curves of the cemented carbide materials are obtained,and the damage value is obtained.By processing the data by fitting,the damage evolution equation is derived,and the damage degree of the tool can be predicted according to the cutting time.