Research And Application Of Soft Reduction Model For 360mm×450mm Bloom Continuous Casting Machine With Dynamic Soft Reduction

In this paper, soft reduction process of dynamic soft reduction was analyzed, by using finite element analysis software MSC.MARC, and the distribution of stress/strain inside the bloom as well as reduction gradient was investigated.The main research work and corresponding results as follows:1. Numerical analysis of CC Bloom natural shrinking. The shrinking volume is an important parameter of bloom which was calculated during the whole CC process. The real-time temperature distribution of bloom was loaded, and the thermal coupling calculation was proceeded in the bloom continuous casting process. The shrinking volume of bloom was calculated during the whole CC process. The result shows that:As the casting speed increases, the shrinking volume becomes smaller, the casting speed has much greater effect on the bloom shrinking, and the effect of overheating on the natural shrinking of bloom becomes smaller.2. Numerical analysis of the bloom stress/strain.By using the numerical simulation on bloom continuous casting process, we obtained the distribution of stress/strain inside the bloom. The result shows that:the stress/strain in straightening roller that contacting with the bloom is the largest, and reducing from the surface to the centre of bloom in turn.3. Numerical analysis of the bloom reduction rate. With the actual conditions of slab bloom in a factory, a three-dimensional finite element numerical calculation was made in the process of bloom soft reduction, and the range and laws of reduction rate were obtained under various reduction volume, steel and casting speed. The research shows that:The reduction rate of bloom is approximately linearly reduction along the casting direction. The average reduction rate of bloom has a linear reduction relationship with the casting speed. The kind of steel has small influence on the reduction rate of bloom.4. The online application research of Bloom soft reduction model. The research as well as analysis was done in the process of roll reduction. According to the change of casting speed, solidification end point and other parameters in the process of continuous casting production,the dynamic allocation and dynamic pressure of reduction volume were achieved. The reduction parameters were dynamic achieved at the manufacture of bloom continuous casting by establishing control procedures.After heat test and put into production for six months, the quality of the bloom shows that the implementation of soft reduction achieved the expected effect.