Study On Thermal Boundary Resistance And Process Of Bimetal Composite Tube Spinning

With the rapid development of science and technology, the service condition oftubes being used in many fields, such as oil exploration, marine development, aerospaceand defense industry, becomes worse and worse, the working load becomes morecomplex, so tubes with higher strength, better corrosion resistance, and more stableperformance are urgently demanded, bimetallic composite tubes can meet therequirement. Spinning process has a great advantage of preparing bimetallic compositetubes. However, the study on clad tube spinning is just in the initial stage, manyproblems are to be solved, such as the incoordination between inner and outer tubesduring deformation, and the strength of interface is too low.This paper aimed at the research on thermal boundary resistance and process ofbimetallic composite tube spinning. Firstly, mechanical test was made to analyse theproperties of materials used in this paper, combined with the laws of deformation andstress of inner and outer tubes during spinning, determined the the principle of materialdistribution between inner and outer tubes.According to the characterization and measurement of thermal boundary resistancebetween metals, a platform based on the INSTRON5500R experimental machine wasdesigned, through exploration of thermal boundary resistance and distribution oftemperature field between Al/Al and Al/Cu, the law how the temperature field isdistributed was found, in order to serving for spinning, this paper mainly studied howthe temperature and pressure influence the distribution of temperature in steady state.The spinning process of Al/Al and Al/Cu were simulated by ABAQUS, analysedthe law of deformation and its effects on the interfacial bonding between inner and outertubes. On this basis, carried on simulation by changing temperature, thinning ratio anddistribution of wall thickness, concluded how those process parameters affects thecoordination of bimetallic tubes during deformation, later, brought differentialtemperature into bimetallic tubes and analysed its influence.At last, spinning experiment of Al/Al and Al/Cu were carried out, observed howthe metal deformed, analysed the impact of temperature and thinning rateio to thecomposite tubes, by the test of shear strength, studied the strength of Al/Al and Al/Cuinterface, combined with the observation of interface morphology, obtained the optimalprocess conditions during composite spinning of two groups of materials.