The Temperature Distribution And Air Gap Of The Strip Material Casting Area Casting Process

As a new technology of the areas of metallurgy and material research, the bar casting combine rapid cooling with deformation. It is a new technology of metallurgic formation of TRC which can directly cast liquid metal to double-line or single bar. Recently, conventional methods of metal bar production mostly use many processes, such as continuous castingâ†'coggingâ†'coarse rollingâ†'modest rollingâ†'fine rollingâ†'continuous rollingâ†'coiling or cutting. This old process of production cost highly, used much space and needed a long plant, so the cost of facility and whole project increased. This invention has shortened the production process, reduced cost the unit of production and per ton metal production, improved the final product construction and performance. The goal of the invention can cast the liquid metal directly into a single or double-line bar, which needn't heating and can directly use hot continuous casting, and it accomplished by one process. It overcame the disadvantages of existing technology and the metal cost of per ton. For the increase of the casting velocity, the rheological behavior of metal was strengthened in casting zone, high temperature liquid-solid rheology is more extended, and the metal got into highly pressure rolling at the liquid-solid critical point. The research on temperature field of casting area in this condition is still few, and it is difficult to analysis the thermodynamics behavior of bar with traditional way. In order to exactly know the new phenomenon of rapid casting and build the best technology system, so it's very urgent to study the basic rules of reinforcement bar temperature field in the process of casting.This article generalized the existing state of belt casting technology, combined the characters of continuous casting, and used finite difference to study the mechanism of heat-flow in forming interface, the rule of heat-flow system in multi-coupling mechanism and the heat-flow characters in high temperature gradient change of deformation interface. The physical simulate experiments of rapid casting process were finished in the Gleeble-1500 heat/force simulator, the analyses of aluminum strain force were at different strain rate, strain capacity, strain temperature. Simultaneously, rheological behavior and effect factors of aluminum alloy in liquid-solid phase change and heat deformation process were studied, and it obtained the strain force change condition of aluminum in the specific process. While the technology parameters match complexly in the process of TRC, if using experiments to study the influence of the changes of technology factors on the structure of thin belt, it's very difficult and the amount of work is also large. But if using numerical simulation, the working capacity is sharply deceased. The finite difference coupling analysis model of bar and roll heat flow was built base on heat-flow and finite difference calculus theory. Based on this, the software of ProCAST was used to analysis temperature field of bar in casting process, and obtained the changes of temperature field in casting area and roll. The effect of porosity in the interface contact thermal resistance, contact load and the heat transmission also was also studied in this casting process.