Modeling Analysis And Research On Plate Strain Of The Asymmetric Rolling

The demand for high-performance plates and strips from all walks of life is becoming stronger and stronger with the industrial upgrading and the in-depth development of the manufacturing industry in the direction of high quality.However,the actual phenomenon of insufficient deformation in the central area of the plate rolling process seriously affects the quality of finished products.How to establish the theoretical calculation model of rolling strain and realize the rapid prediction of deformation has become a key problem to be solved.In this paper,the modeling of strain parameters was carried out by taking the same diameter and different speed asymmetrical rolling,the same diameter and different speed snake rolling in symmetrical rolling process,the symmetric rolling process as the specific research objects.The deformation zoning of the snake rolling was discussed according to the dynamic and static characteristicsc The main work and conclusions of this paper are as follows:(1)The metal flow model including shear deformation is established in the plastic deformation zone,according to the practical phenomenon of asymmetric distribution of stress and strain in the deformation zone.The parabolic roll gap inlet boundary equation is proposed according to the kinematic characteristics of plate rolling.On this basis,the theoretical model of near real kinematic allowable velocity field(including velocity component and strain rate component in the plate thickness direction and rolling direction)is established.(2)The models of plastic deformation power,shear power and friction power in the deformation zone are established according to the first variational principle of rigid plasticity and the principle of virtual velocity.Combined with the distribution of neutral points,the calculation model of total power under different composition of deformation zone in the same diameter and different speed serpentine rolling process is discussed.The theoretical models for calculating the strain of symmetrical rolling,the same diameter and different speed asymmetrical rolling and the same diameter and different speed snake rolling under the plane strain model are finally established based on the principle of minimum energy and the theory of continuum mechanics.(3)Through numerical simulation and experimental verification,the distribution of velocity,stress and strain in the deformation zone is obtained.The influence of process parameters on the equivalent plastic strain after rolling is analyzed,and finally the accuracy of the theoretical model is calculated.The results show that the maximum relative error between the theoretical model calculation results and the FEM results is less than 14.52%.The maximum relative error between the theoretical model calculation results and the experimental results is less than 10.19%.The established theoretical calculation model not only has good accuracy,but also the calculation time is less than 1 second under the configuration of mainstream computers.(4)The optimal process of snake rolling with different compositions of deformation zone is established and discussed according to the principle of energy.This model provides a theoretical basis for the further research and practical production application of serpentine rolling.