Numerical And Experimental Researches On Warm-Rolling Process Based On The Experimental Mill

The article is in research of the influence of the warm-rolling process parameters on the temperature of deformation zone by means of the finite element numerical simulation and the warm-rolling experiment, which is relying on the project of "Hydraulic-tension reversible cold/warm-rolling experimental mill" undertaken by the State Key Laboratory of Rolling and Automation (RAL), NEU. The chief original work and results are expressed as follows:(1) Analyzing the main function and operating principle of the warm-rolling experimental mill. The principle of hydraulic-(micro) tension control system, online resistance heating technology of the strip and electromagnetic induction heating of the work roll, which can ensure the completion of the warm-rolling experiment of thin strip made of difficult-to-deformation material, were analyzed.(2) Achieving the key parameters for the numerical simulation experiment. The physical parameters of work rolls,86CrMoV7, were achieved via JMatPro, the material property simulation software. Flow stress constitutive equation of the strip, AZ31 magnesium alloy, was regressed based on the data of the single compression test, by which the true stress-true strain curves of the strip was drawn. The convection coefficient of the strip, the interfacial heat transfer coefficient between the strip and work rolls were achieved by the comparison of the practical and numerical tests.(3) Discussing the influence of the warm-rolling process parameters on the temperature of deformation zone. The experiment of numerical simulation was designed by means of simple variable method, and three points along the thickness direction, in the center,1/4 and surface, were monitored. The results showed that the temperature of deformation zone was influence by the interaction of the deformation heat of the strip and the heat loss by rolls, which were affected by the warm-rolling process parameters.(4) Developing the mathematical model of the outlet temperature of deformation zone. The scheme of the numerical simulation experiment was established by means of orthogonal experimental design. The mathematical model of the outlet temperature of deformation zone was regressed based on the data from the numerical simulation experiment, which can show the influence law of the warm-rolling process parameters on the outlet temperature of deformation zone.(5) Verifying the mathematical model of the outlet temperature of deformation zone by the data from the practical warm-rolling experiments. The calculated precision of the mathematical model can reach ±10?. The temperature of the work rolls and the strip were calculated reasonably by the mathematical model to satisfy the warm-rolling processes, and then the warm-rolling experiments were carried out.