Temperature Model Research On Warm-rolled Deformation Zone Of Hard-deformed Metal Strip

Based on the experimental unit project of high silicon electrical steel Fe-6.5%Si alloy of Wuhan Iron and Steel Group named "thin strip continuous-casting and warm-rolling" mainly developed by Northeastern University,the temperature model on warm-rolled deformation zone of the hard-deformed metal was studied.The main work and achievements are as follows:(1)The basic theories of warm rolling process and temperature model of metal materials were introduced.The coiling type warm rolling experimental units and its working principle were analyzed.The warm-rolling units is mainly used for the warm-rolling of the hard-deformed metal strip.Except from the basic steckel rolling function,its main function include induction heating of the workpiece,roll-heating by heat conducting oil,heating and insulation of the coil box and so on.(2)Determination of the key parameters of numerical simulation and material flow stress.The high silicon electrical steel Fe-6.5%Si alloy was used as the main research material,and its physical parameters were calculated by the material property analysis software JMatPro.Thermo-mechanical compression experiments was carried out to obtain the real stress-true strain curve of Fe-6.5%Si alloy under certain conditions.The peak state deformation activation energy and thermal processing equation of Fe-6.5%Si alloy were determined and the constitutive equation of the flow stress was regressed.(3)The influence of the parameters on the temperature of the deformation zone was studied.Based on the Deform-3D software,the numerical simulation of Fe-6.5%Si alloy was carried out by using the univariate method,and the surface and the inside temperature variation of the workpiece was tracked.The influence of each parameter on the deformation zone temperature and the outlet temperature change regularity was analyzed.(4)The mathematical model of the outlet temperature on deformation zone was established.The numerical simulation experiment of of Fe-6.5%Si alloy rolling process with rolling speed range of 0.1?1m/s and 0.01?0.1m/s was respectively formulated by orthogonal design method,and the finite element simulation was carried out.The influence of each process parameter on the outlet temperature and outlet temperature drop of the warm-rolled strip deformation zone is analyzed,and the results is compared.The multiple non-linear regression of the numerical simulation datas were used to establish the mathematical model of the relationship between the exit temperature and the process parameters.(5)The experimental measurement error of the outlet temperature of workpiece deformation zone was analyzed by warm-rolling experiment of Fe-6.5%Si alloy.Then the contact heat transfer coefficient was determined and the mathematical model was validated.(6)The warm-rolling process of Fe-6.5%Si alloy sheet was analyzed.Then high silicon steel sheet with thickness less than 0.5mm was obtained by warm-rolling experiments.Finally,warm-rolling process of sheets of Fe-6.5%Si alloy and other hard-deformed metal is summarized.