Research On Initial Pouring Processparameters Of The Twin-roll Strip Caster

The twin-roll strip casting is a kind of near net shape forming process, with the advantage of short process, low energy consumption and high economic benefits, it has been widely studied by researchers and companies in recent years. But there are many problems need to be overcome in order to realize the industrialized production as soon as possible. How to complete the initial pouring stage is the first problem in the strip casting, the unreasonable initial pouring process will cause the accidents of strip blocked or steel leakage, then the casting process will be broken off. But the current way of researching the process is through a great deal of experiments, and the results were regarded as the core technology and confidentiality. So the changing rules of the flow, heat transfer and solidified shell in the molten pool during initial pouring stage has been researched, which under the different process parameters. And the research results can be used to providing certain theoretical guidance to establishing the initial pouring process.The two-dimension transient mathematic model of the ?350500 ? strip caster during initial pouring stage was established, which coupled with the flow, heart and solidification. The distribution of the flow field in molten pool and the time from initial pouring stage to steady stage were studied through the numerical simulation, which under the different process parameters, including casting speed, pouring rate and the width of side hole of the delivery device.The solid fraction of the molten pool export and the kiss point height of the center line of molten pool during initial pouring stage were studied through the numerical simulation, which under the different process parameters, including casting speed, pouring rate, pouring temperature and the width of side hole of the delivery device.In order to describe the interfacial heat transfer law more reasonably, the mathematic model of heat transfer during the initial pouring stage was derived, which in consideration of the heat transfer characteristics between the molten pool and casting rolls and represents the heat flux as the function of the boundary temperature of molten pool. And it is verified through the experiment results and the numerical simulation.