Experimental Study On The Metal Tube Rolling Deformation Process And Numerical Simulation

Bimetal composite pipes are also called double-layer tubes or coated tubes,which are composed of two different metal materials of pipes, having two ormultilayer of inside and outside. At present, there are many manufacturetechnologies of bimetal composite pipes, most of which are using the whole orpartial plastic forming for composite, for example, such as the traditionalcentrifugal casting, thermal expansion welding, thermal diffusion welding, hotextrusion, rolling composite, etc; the novel methods have explosive cladding,powder metallurgy method, spray forming, hydraulic composite technology,spinning technique, electromagnetic molding, etc. In a word, according to thecombination of bonded interface of bimetal composite pipes, the claddingtechnologies can be divided into mechanical cladding and metallurgicalcladding.This paper regards the rolling composites of copper-aluminum compositetube and steel-copper composite tube as an example to introduce the continousrolling deformation process of bimetal composite pipes through the finiteelement numerical simulation and experimental research. Copper-aluminumcomposite tube use copper tube as the cladding and use aluminum tube as thegrassroots, whose rolling process using cold rolling composite process;Steel-copper composite tube use copper tube as the cladding and use steel tubeas the grassroots, whose rolling process using hot rolling composite process.Rolling mills are using3-roller Y type mill. Based on the theory of metal plasticdeformation, tube and rod rolling technology, the tension reducing theory, heattransfer analysis, nonlinear finite element theory, the rigid-plastic finite elementtheory, using the large-scale non-linear finite element simulation software ofANSYS/IS-DYNA, this paper make analysis and research on the process ofrolling composite plastic deformation process, the mechanical properties andtemperature distribution in the bonding process of bimetal composite pipes bythermal mechanically coupled-field simulation.Finally the rolling test of steel-copper composite tube was given to verify the theoretical analysis. Under the existing experimental conditions, the researchwas finished on the homemade50three-roll continuous-rolling pipe mills byTaiyuan University of Science and Technology and produced one400mm longsteel-copper composite tube. And the feasibility of rolling composite techniqueof bimetal composite pipes was further verified by experiment.