Study On Thermal Distribution Characteristics Of Cutting Deformation Zone Under Heavy Load Cutting Condition

2.25Cr-1Mo-0.25 V steel is widely used in oil and energy industry in China,is an important part of hydrogenation reactor cylinder material,materials with high strength,good plasticity,high temperature resistance and other advantages,is difficult to process material.In heavy cutting,the depth of cutting and feed are large,then leads to the resulting cutting temperature and cutting force is also very large,under the combined action of thermal-force,the tool wear will be affected,therefore,to study the thermal-force distribution of cutting deformation zone under heavy load cutting,master the distribution law,so as to solve the low processing efficiency,tool wear and other serious problems.Firstly,cutting force prediction model is established based on cutting force coefficient of rake face,verify the effectiveness of turning force model by cutting test;the process of large chip curling was studied to reveal the mechanism of chip formation;analyze the mechanical characteristics of chip breaking during heavy cutting,provide theoretical reference for the study of large chip curling and breaking.Secondly,the temperature field of heavy cutting deformation zone is studied,the formula for calculating mean temperature of shear zone and tool chip contact area is deduced;the relationship between cutting temperature and tool wear was quantitatively analyzed by tool wear test and finite element simulation,establish tool flank wear model.Thirdly,to carry out cutting test,collect the cutting temperature and cutting force and the chips under different parameters,provide experimental data for the prediction of cutting force model;compare and analyze the cutting force and cutting temperature of different groove cemented carbide tools and the chip breaking performance,provide reference for design and development of heavy cutting tools;grinding hard alloy rods for high temperature tensile test,research on high temperature mechanical properties of cutting tools material.Finally,establishing finite element simulation model of turning2.25Cr1-Mo-0.25 V steel,study on the cutting force,cutting temperature and stress under different cutting parameters,then verify the validity of the cutting force model;through orthogonal test,to select the best cutting parameters.