Study On Optimization Of Tundish Configuration In Small Vacuum Induction Furnace

With the rapid development of China's aerospace and defense industries,the demand for precision alloys is increasing,and the quality and physical properties of precision alloys are also increasing.In order to meet the increasing demand,vacuum induction furnace is an important equipment for smelting precision alloys,its volume is continuously increasing,and the pouring process is gradually drawing on the mature continuous casting tundish process.And achieved a certain metallurgical effect on t he larger furnace.However,for small vacuum induction furnaces with high grades,small demand,and high quality requirements for precision alloys,the use in the casting process is still immature and has certain problems.The subject is a single-flow tundish used in a precision alloy plant 1.3t vacuum induction furnace.Using physical simulation and numerical simulation methods,the tundish structure and flow control device were analyzed and studied,and the resulting optimal solution was improved that was conducted by industrial testing.Among them,the physical simulation uses the secondary analysis-model experiment to analyze the physical process.Through the sub-analysis method to obtain the similarity criterion of the process,a 1:1 physical model was established and simulated.The numerical simulation is based on the relevant theoretical equations,using Fluent to establish a three-dimensional mathematical model,and to simulate and solve the problem of the research of the project.The main conclusions of the experiment:?1?The distribution of flow field and pressure field in the original tundish was unreasonable,and the dead zone proportion was 27.82%.Short-circuit current exists.The response time and dwell time of the fluid are only 2.1s and 39.46s respectively.After the expansion,the improvement effect of the flow field and pressure field of the fluid was not obvious,the proportion of dead zone increased by 2.74%,and the short-circuit current still existed.Comb ined with the actual pouring,the more reasonable depth of the tundish bath should be controlled at about 210mm.After the expansion and the addition of diversion walls,the flow field of the fluid tends to be reasonable,the short-circuit flow is eliminated,and the proportion of dead zones is reduced.?2?Two sets of optimization schemes III₃ and III₁₀ were obtained using the range analysis for the orthogonal experimental scheme.Through numerical simulation,we further studied the effect of the uplift a ngle of the diversion hole on its flow field and other parameters to obtain an optimal solution III₁₂.Among them,scheme III₁₀ is the optimal scheme.The optimized structure is that the diameter of the guide hole on the partition wall is 26mm,the vertica l height is 20mm,the horizontal distance is 120mm,and the distance from the guide wall to the nozzle is 60mm.The average residence time was extended to 49.78s and the dead zone was reduced to 14.89%.?3?The surface quality of the steel ingot has been significantly improved after casting with the improved optimal solution,and the defects after the molting are basically eliminated.T[O]and[N]in steel ingots have been greatly reduced,and the quality has been improved to some extent,so that the performance and quality of the al oy have been improved.