Research On Variable Thicknes Cold Rolling Technology Of Bimetal Composite Plate

Cladded Longitude Profile Plate(CLP)is a new type of functional material produced by variable thickness rolling technology with bimetal laminated composite plate as raw material.CLP board not only maintains the advantages of saving material and weight of traditional single metal variable thickness plate,but also meets the special functional requirements of wear resistance,corrosion resistance and high temperature resistance by choosing suitable cladding metal materials,so as to realize the perfect combination of low cost and high performance,which has broad application prospects.In this paper,asymmetric bimetal clad plate asynchronous rolling technology with variable thickness is taken as the object of study.The deformation behavior,reduction rate distribution and warping behavior of component metals in the deformation zone of thicker and thinner rolling are studied by combining finite element simulation with experiment.The technological conditions of coordinated deformation of component metals in composite interface are established and the rolling process is optimized.The thickness of composite interface layer was determined by scanning analysis of copper-aluminium laminated composite sheet used in the test.The true stress-strain curves of copper clad composite sheet and aluminium base material were obtained by tensile test.The bonding strength of copper-aluminium composite interface was obtained by peeling test and shear test.The peeling experiment was established based on ABAQUS software and Cohesive cohesion unit.The fracture energy of composite interface is determined by inversion of finite element model.Based on cohesion model,the finite element model of variable thickness rolling process of bimetal clad plate is established.The stress and strain state of each layer of metal in the rolling deformation zone during variable thickness rolling and the variation law of rolling force and neutral angle in the process of thicker rolling and thinner rolling are analyzed.The variation law of thickness ratio and rolling force of different components of metal layer is studied.Deformation compatibility of warpage and composite interface components after rolling and its influence on interface bonding state are studied with different allometric ratio and allometric ratio.The variable thickness asynchronous rolling mill was designed and manufactured,and the variable thickness asynchronous rolling experiment of bimetal was carried out to verify the rationality of the finite element model.The interfacial strength after rolling was analyzed by rolling experiments with different thickness ratios,reduction ratios,different speed ratios and different diameter ratios.The compatibility conditions of interfacial deformation in asynchronous rolling of bimetal clad plates with variable thickness were established by combining the results of finite element analysis.