Research On The Process Of Bimetallic Composite Tube By Spinning

In recent years, due to the excellent comprehensive performance, bimetalliccomposite tubes have been widely applied in many field, for example the pipelines, thetubes of heat exchanger and medical devices. The processing technology of thebimetallic composite tube is varied, while each technology has its limitations. As alow-cost, low-load, high efficiency plastic processing technology, spinning process hasgreat potential in the preparation of bimetallic composite tubes which require highperformance. However, so little the theory and process of dual-metal clad spinninghave been researched, so the preparation of metal complex tube experience is difficultto be mastered.In this paper, three methods, include finite element simulation, theoretical studiesand experimental research, are used to study the spinning composite tube. Firstly, tostudy the deformation characteristics of the metal in the process of forward-spinningand reverse-spinning, the spinning process of single-layer tube have been analyzed.According to the comparative analysis of forward-spinning and reverse-spinningprocess, concluded that the forward-spinning process is more suitable for thepreparation of composite tube. Stress analysis of the contact metal interfaces, which islocated in different regions, have been done. Combined with several solid phasebonding mechanisms, the influence of spinning process to the bond strength of twosurfaces have tested and analyzed.Secondly, the spinning process of single-layer tube have been simulated byABAQUS, on this basis, analyzed the deformation characteristics of single-layer tube’smetal and the influence of different parameters. By simulating the assembly process ofthe Al/Al composite tube, along the radial, the positive pressure between two tubes’interface have been calculated. By simulating the spinning process of the Al/Alcomposite tube billet, the paper analyzes the problem of deformation uncoordinatedand Interface combined with poor, further study the impact of the performance by theexperimental temperature, the thinning rate, and the positive pressure between twotubes’ interface.What more, experimental study of Al/Al composite tube spinning process,analyzes the experimental temperature, the reduction rate and the billet thickness on the effect of forming the composite tube. Further study of the multi-steps spinningprocess of Al/Al composite tube, analyzed the method of annealing for a long time atlow temperature effect on the composite tube forming process. By metallographic test,explores impact on the organization by metal deformation.Lastly the composite tube spinning experiment use5groups of experimentprogram, during which infrared thermal imaging devices is used to real-timemonitoring the temperature of billet and mold. According to the experimental results,studies the internal and external metal deformation compatibility and interfacialbonding. By mechanical tests, compares the programs of Cu/Al composite tubeinterface bonding strength. Observed the morphology of the bimetallic interface,analysis the reasons for the interfacial bonding strength difference.