Analysis On Rolling Force And Roll-shaft Mechanical Behavior Of Three-roll Planetary Rolling Process Of Copper Tube

Copper tube is important functional material in the manufacturing field. Progress of economic and industrial technology make the performance index of copper tube develop toward high conductivity, high thermal conductivity and high precision. It has been an urgent task of the copper processing industry that researching advanced production technology of being shorter process, continuous, automation, saving energy and material in characteristics. The three-roll planetary rolling technology is a new advanced technology in the processing area of copper tube, which has many problems to research, such as processing largely, deforming complexly, rolling process being affected by high temperature and rolling force. It is significant that analyzing deformation process, temperature, rolling force and roll-shaft mechanical behavior in the planetary rolling process of copper tube.Based on analysis of the three-roll planetary rolling technology and the rolling deformation characteristics of copper tube, determining to apply large deformation elastoplastic finite element method and thermo-mechanical coupling analysis theory to simulating the rolling process, and use large-scale non-linear finite element analysis software MSC. Marc as computing tool. Combined with the actual production, through giving rolling technology parameters, simplifying rolling model, building geometry model and defining boundary conditions, the reasonable finite element model of copper tube three-roll planetary rolling is established. The finite element model can partly replace physical test model to be used in technology research, which can improve efficiency of study and reduce research costs.Combined with the result of simulation, analysis on deformation process, metal flow, stress-strain status and rolling force of tube billet has been done. It can be seen: from being into rolling area to out of rolling outlet, the cross section shape of tube billet experiences the deformation process of being circular, being circular arc triangle and then back to being circular; material of tube billet spiral forward in the rolling process; the top temperature of tube billet reached to690℃; rolling force fluctuates between190-250kN in the rolling process. Simulation analysis of rolling process can provide guidance for the optimization of rolling technology parameters, the design of roll shape and the temperature control of deformation area in the actual production, and lay the mechanical foundation for the design of mill structure.Combined with the rolling force of roll obtained from the simulation, finite element static analysis and finite element dynamic analysis about the roll shaft has been done, getting its maximum working stress, deformation, static-dynamic characteristics and harmonic response curve of the roll shaft that is stimulated by the rolling force, and analyzing the impact of deformation and vibration of the roll shaft on rolling process.This paper research contributes to promote the applying of planetary rolling technology in the field of copper tube processing, and offer high performance and high precision copper tube products for high-tech areas like air conditioning refrigeration, ocean engineering and so on.