Research And Finite Element Simulation Of Al/Cu Clad Composite Fabricated By Cast-Extrusion/Rolling Technology

Bimetal composite material is a new material, which assembles two kinds of metalswith different performance. Due to the high frequency signal current characteristics of theskin effect, copper clad aluminum composite material not only has a high signaltransmission characteristic, but also advantages of light weight, high strength and lowcost. In particular, it can save a lot of copper resources. In this paper, on the basis ofimproving the copper clad aluminum wire casting-cold extrusion process which is putforward by Luo Junting, copper clad aluminum casting-rolling process is furtherproposed, which can improve the metallurgical bonding performance of the copper cladaluminum row. The forming load, forming process and microstructure are studied by themethod of theoretical research, finite element simulation and experimental.Through the analysis of microstructure of the copper clad aluminum compositesprepared by casting-cold extrusion process, the microstructure distribution of copper cladaluminum composite in the process of extrusion deformation is summarized, which isexplained by maximum shear strain theory. The mechanical properties of copper cladaluminum composites prepared through the technology are studied by nano-indentationexperimental, and prove the microstructure variation of products during the deformationfrom the perspective of the mechanical properties.With the methods of increasing interfacial friction factor of copper and aluminum, thecopper clad aluminum composite casting-rolling process is simulated through marc finiteelement analysis software. The bimetal rolling process deformable partition model is setup and districts of stress-strain of the deformation process are analyzed, which proved thefeasibility of casting–cold rolling process of copper clad aluminum.Through the variables of cu volume content in bimetal and the rolling reduction rate,the rolling process of the copper clad aluminum composite material are simulated undervarious condition, extract the rolling force data of variety of conditions obtained by thesimulation. On the basis of the theoretical calculation of the rolling force of a singlematerial, analyzed the relationship between the rolling force and both of the metal volumeratio and the rolling reduction rate in the rolling process of the double metal, derived the theoretical formula of rolling force in bimetallic rolling.The products with good performance bonded interface are rolled out throughexperimental test of copper clad aluminum casting-cold rolling process. Throughobservation and analysis of the microstructure and interface of the products, thedistribution pattern of the microstructure of the copper clad aluminum products of casting–cold rolling is concluded.