Study On Copper/Stainless Steel Strips Rolling Composite Process Assisted By Auxiliary Plate

With the development of industrial technology,mechanical products continue to develop in the direction of intelligence and miniaturization.Copper / stainless steel composite strips have excellent electrical conductivity and excellent mechanical properties,have got wide attention from relevant scholars.The preparation process of copper / stainless steel composite strip is very complex.Copper and stainless steel can be successfully combined by the way of magnetron sputtering,ejection deposition method and diffusion welding,but these processes are complex and the cost of these processes are very high.If copper / stainless steel composite strips were prepared by traditional rolling method,the plastic difference between copper and stainless steel is great,the deformation coordination ability of copper and stainless steel is poor,and the rolling process is affected by elastic deformation of rollers,it is difficult to achieve the required reduction.For the problem of metal strip rolling composite process has high requirements for equipment and poor deformation coordination ability of copper and stainless steel,a layer of auxiliary plate(Q235)was added under the copper strip and stainless steel strip,so that the rolling parts can successfully pass the two roller mill and achieve the required reduction,thus realizing the composite.Through this process,the copper / stainless steel composite strip was successfully prepared in this paper.The effect of auxiliary plate is studied by finite element simulation and experimental research.By using ABAQUS finite element analysis software,rolling composite process assisted by auxiliary plate mode and the common rolling model are established.Firstly,the correctness of the finite element model is verified by comparing the thickness of rolling parts obtained in the finite element analysis and rolling experiments under the same conditions.Secondly,the role of the auxiliary plate in the copper / stainless steel strip rolling composite process is explored: the existence of auxiliary plate improves the deformation coordination ability of T2 copper and 304 stainless steel,and promotes the recombination of T2 copper strip and 304 stainless steel strip.With Q235 carbon steel(1 mm)as auxiliary plate,T2 copper(0.3 mm)and 304 stainless steel(0.1 mm)as raw materials,the experiment was carried out.Experimental results show that when the rolling temperature is 400? and the total rolling reduction is 38%,copper /stainless steel composite strips with good combination can be prepared by 150 mm two-roller reversible rough rolling mill.Copper / stainless steel rolling composite process assisted by auxiliary plate is verified.After rolling,the composite strip has a low elongation,annealing experiment was conducted with the annealing temperature is 400?.It is found that with the increase of annealing time,the tensile strength of composite strips decreases and the elongation increases.When annealed for 60 min,the tensile strength of the composite strips reaches 391.52 MPa,and the ultimate elongation reaches 25.3%.