Numerical Simulation Of Plastic Deformation Zone And Rolling Force Model Of Vibration Composite Cast-Rolling

Under the background of my country’s lack of copper resources,Cu/Al composite materials had been paid more and more attention.In recent years,the solid-liquid composite technology developed on the basis of twin-roll cast-rolling technology was a new method for preparing Cu/Al composites.Due to the advantages of high efficiency and short process,composite cast-rolling had become the frontier of the research field of bimetal layered composite material forming.However,composite cast-rolling still had technical problems such as aluminum matrix microstructure defects and low interface metallurgical bonding rate.In order to solve this problem,the article proposed a new vibration composite cast-rolling technology.The technology applied a reciprocating energy field to a unilateral roll to produce a reciprocating rolling effect on the plastic deformation zone.Therefore,this technology achieved the goal of improving the microstructure of the aluminum matrix and optimizing the bonding strength of the interface.However,the vibration of the unilateral roll will have a significant impact on the stress state of the plastic deformation zone of the strip,which brings new challenges to the control of the cast-rolling process.By analyzing the characteristics of the plastic deformation zone of the vibration composite cast-rolling,a thermo-mechanical coupling model for the plastic deformation zone of vibration composite cast-rolling was constructed.This model simulated and analyzed the influence of different vibration parameters on friction and rolling force.The model simulated and analyzed the influence of different vibration parameters on friction and rolling force.And the influence mechanism of rolling force and friction force was explained by the analysis of the ratio of the cross shear zone.In addition,in view of the influence of conventional parameters on the vibration composite cast-rolling,this paper studied the changing rule of the rolling force in the plastic deformation zone of the vibration composite cast-rolling under different solidification interface heights and different rolling speeds.In this paper,the Gleeble-3800 thermal simulator was used to perform isothermal thermal compression experiments on copper-aluminum layered composites to analyze the deformation behavior of copper-aluminum composites under different deformation conditions.The deformation resistance model was constructed based on the compressed data collected by the system.Finally,based on the change law of the rolling force in the plastic deformation zone and the deformation resistance model,the vibration composite cast-rolling force model was derived.In this paper,experiments were carried out on the independently developed vibration cast-rolling experiment platform,and the peel tests and metallographic analysis of the obtained composite strip were carried out.The results show that vibration enhanced the peel strength of the composite strip and improved the uneven bonding strength of the composite strip.Based on the observation and analysis of the metallographic structure of the composite strip,and it was found that vibration refined the grains of the composite strip and improved the mechanical properties of the strip.Finally,the deduced vibration composite cast-rolling force model was verified by the rolling force experimental data collected by the sensor during the experiment.