Optimization Of Nozzle Configuration Parameters For High Quality Tinplate Continuous Casting By Physical Method

With the development of continuous casting technology, people pay more attention to the quality of billet and higher requirements are put forward to the casting process. The flow field in the casting mold influences inclusions floating, fusion of the slag powder and growth for the solidified shell. Therefore, the research for operating parameters and nozzle structural parameters which affects the flow field is of great importance to optimize nozzle structure and improve quality of the billet.Casting mold and nozzle are the main research subject. According to the size of the actual mold, physical model is designed with the ratio of 1:1. Water simulating experiment is done on the basis of similarity principle. Research of different pulling rate and depth of SEN is done to obtain the changing rule of surface velocity?flow field and distribution of the liquid slag. Then, experiments for different bottom structure of SEN?impact angles and exit area ratios are done to get the field flow. Optimized water parameters are obtained after a series of physical simulation experiment.The result is as follows: High pulling rate will lead to high injecting velocity and high surface velocity. Low immersion depth will lead to low velocity and low fluctuation. The surface velocity of convex nozzle is higher than flat and concave nozzles. The surface velocity drop down obviously and the distribution of the slag get better when concave nozzle is used. What`s more, the probability of slag entrapment also get down. When the exit angle is 20°, the distribution of the slag is improved. Increasing exit area ratio can also decrease the injecting velocity and surface velocity which will improve the distribution of the slag. According to the influence rule, optimized project is put forward. Good experimental result is acquired with better slag distribution and less mold flux entrapment.