Numerical Simulation And Experimental Study Of Temperature Field During Cooling Process Of Copper Tube After Three Roller Planetary Rolling

Along with people's unceasing enhancement to the life quality request stimulated the air conditioning refrigerator refrigeration domain unprecedented development.Horizontal continuous casting of copper tube billet after milling surface is usually conducted on three-roll planetary rolling mill rolling sufficiently,the tube billet by the as-cast organization after rolling roller compacted crushing,recrystallization becomes fully recrystallization organization,at the same time set the cooling jacket in rolling out the end,the rolling out of the tube billet uniform grain fine,for after stretching process that provides the high quality of billet.The main research contents of this paper are as follows:(1)According to the technological characteristics of three-roll planetary rolling in existing copper pipe mills,a three-dimensional thermo-mechanical coupling simulation model for three-roll planetary rolling process of copper pipe is established by using large-scale nonlinear finite element software ABAQUS.The C3D8 RT eight-node Thermo-coupled hexahedron element,three-dimensional linear displacement,three-dimensional linear temperature,reduction integral and sand are used.Leakage control,using Explicit display dynamics to simulate the three-roll planetary rolling process,using ALE grid adaptive function to solve the problem of calculation non-convergence caused by grid serious distortion in the process of copper tube rolling,and realize the complete planetary rolling of tube billet from bite to stable rolling.The temperature field and stress field of rolled billet after rolling are obtained by finite element simulation.(2)According to the process characteristics of the post-rolling cooling process in the existing copper pipe mills,the cooling water model of the cooling process is established by using the finite element software FLUENT.With the help of Data Exchange Platform coupling ABAQUS and FLUENT software,the Thermal-Fluid-solid coupling finite element model considering the motion factors is established based on Data Exchange Platform,and the three-roll planetary rolling process is established by using the software ABAQUS.The three-dimensional thermo-mechanical coupled simulation model is used to simulate the whole cooling process of the rolled slab.The pressure field and velocity field in the cooling water jacket and the temperature field in the cooling process are analyzed.(3)The structure parameters of the cooling water jacket including the inlet and outlet radius and the inlet pressure of the cooling process parameters wData Exchange Platform by the coupled thermo-fluid-structure simulation model established by Data Exchange Platform.The influence of different parameters on the temperature field of the rolling blank was obtained.The inlet and outlet level of the cooling water jacket were evaluated by the temperature uniformity.The influence of inlet and outlet position on the fluid pressure field,velocity field and rolling temperature field in the cooling jacket was analyzed.(4)Metallographic test and microhardness test were carried out by taking samples from rolling billets produced in factories and using Gleeble thermal simulator,thermal simulation experiments were carried out on the base metal of copper tube billets sampled from factories according to the thermal cycle curve obtained by numerical simulation,and then metallographic test and microhardness test were carried out.The accuracy of the model is verified by the metallographic structure and microhardness of the samples manufactured and simulated.