Analysis Of Stress Field During Cooling Process Of Copper Tube After Three Roller Planetary Rolling And Modification Of Cooling Water Jacket

TP2 copper tube is the preferred high-efficiency heat exchanger tube for the manufacture of heat exchangers such as evaporators and condensers,and its processing and production process has always been the focus of relevant practitioners.However,most of the attention of researchers is on the three-roll planetary rolling of copper tubes,and the cooling process after rolling is rarely studied.In the factory,the cooling of the rolled piece is mainly carried out by experienced operators,there is no clear understanding of the effect of cooling on the quality of rolled products,so it is difficult to guarantee the quality of rolled copper tubes.The cooling process of copper tube after three-roll planetary rolling is a complex process of multi-physics coupling,including flow field,temperature field and stress field.With the help of finite element software ABAQUS,FLUENT and MPCCI,the finite element simulation of the three-roll planetary rolling and post-rolling cooling process of copper tubes is carried out.The main research contents of this paper are as follows:(1)According to the relevant parameters and characteristics of the three-roll planetary rolling mill used by a copper tube manufacturer,a thermo-mechanical coupling model of horizontal continuous casting tube billet three-roll planetary rolling was established through the finite element engineering simulation software ABAQUS,the C3D8 RT unit is used to mesh the copper tube billet,and then the whole process of horizontal continuous casting copper tube billet three-roll planetary rolling is simulated using the display dynamics module Explicit that comes with the software,obtained the the temperature field and stress field distribution of rolled piece.(2)Through the finite element software FLUENT referring to the cooling equipment and cooling process parameters established the cooling water jacket model and the thermo-fluid-solid coupling fluid model of the rolled piece through the water cooling process.Then the temperature field and stress field results of the three-roll planetary rolling simulation are used as predefined fields,a thermal-fluid-solid coupling structure model of through water cooling is established through ABAQUS.Finally,the multiphysics coupling software MPCCI was used to realize the data exchange between ABAQUS and FLUENT,the distribution of the flow field inside the cooling water jacket,the cooling rate and stress field of the rolled piece during the cooling process are analyzed.(3)Taking the uniformity of the stress distribution as the evaluation standard,the thermo-fluid-solid coupling model based on MPCCI was used to study the influence of the inlet positions and outlet positions on the internal flow field of the cooling water jacket and the stress field distribution of the rolled piece,it also analyzed the influence of the size of the inlet,the size of the outlet and the pressure of the inlet on the uniformity of the stress distribution of the rolled piece.(4)The laser ultrasonic method was used to measure the stress of the samples and compared with the stress from the numerical simulation,which proved the accuracy of the thermo-mechanical coupling model and the thermo-fluid-structure coupling model.