Research On Warm-rolling Model And Technological Experiment Of Magnesium Alloy Strip On Steekle Mill

In this paper,a steekle mill was taken as the background,to achieve the industrialization of large-volume and wide-width magnesium alloy strip production.The influence laws of the relevant parameters on the deformation zone temperature of magnesium alloy during warm-rolling were studied.Three deformation zone temperature control models of magnesium alloy strip during warm-rolling for the enactment of warm-rolling procedures were developed for industrial producing.The main work and achievements of the paper are as follows:(1)The warm-rolling process of metal materials were analyzed,and then the technological characteristics of warm-rolling mill and the online temperature control technology of strip or rolls and working principle were comprehended.And the composition of warm-rolling mill with steekle rolling and the control ways of parameters to ensure the stability of the warm-rolling process were described.(2)The influence laws of the outlet temperature in deformation zone by initial strip temperature,roll temperature,rolling speed,reduction rate and the initial thickness 5 parameters in total during warm-rolling were discussed.Deform-3D software was used to simulate the warm-rolling process of AZ31B magnesium alloy by the method of controling single variable.The temperature variation on the surface and inside of the strip material was detected by the point tracking technique.Then the influence laws of outlet temperature in the deformation zone by each parameters and the variation of outlet temperature during warm-rolling process were analyzed.(3)The mathematical model of outlet temperature Toutlet in the deformation zone were constructed.The orthogonal design of AZ31B magnesium alloy was used to make the finite element numerical simulation program of warm-rolling AZ31B magnesium alloy at different rolling speed,and then to complete the finite element simulation.Through the calculated results,the influence laws of each warm-rolling process parameter on the outlet temperature of the deformation zone during warm-rolling were discussed and compared.And then nonlinear regression fitting were performed on the numerical simulation data to establish the outlet temperature mathematical model in deformation zone of three kinds of warm-rolling speed range.(4)According to the determined AZ31B magnesium alloy strip warm-rolling process scheme,the experimental program within the range of process parameters to make experimental verification were formulated.The results showed that the outlet temperature mathematical model of the deformation zone at three different warm-rolling speed ranges had small error between calculated value and measured value and the models' accuracy were pretty good,which could provide theoretical guidance for the formulation of warm-rolling process of AZ31B magnesium alloy.(5)The microstructure and mechanical properties of AZ31B magnesium alloy under different warm-rolling processes were analyzed,which could provide theoretical reference for the formulation of the warm-rolling process.