The Slab Caster Mold Numerical Simulation Of Flow Field And Temperature Field And The Structure Optimization Design

Mold, which is the heart of the cast, is one of the most important part. It plays an indispensable role in cotrolling the quanlity of the steel liquid and the slab. The fluid flow and heat transfer in the mold have direct influence on heat transfer, inclusions floatation and the melt of casting powder, it also has something with many surface and internal quality problems such as center crack, triangular crack, corner crack.The reasonable cooling structure of the mold can improve the cooling effect and extend the service life. Therefore, it is necessary to study the fluid flow, heat transfer of liquid steel and the mold structure in the mold.The article studied the slab cast of Ji Nan steel, it establishes the flow field in the crystallizer and the temperature field of3d model using the factory production process parameters, USES the FLUENT software to change speed.Based on the analysis of the flow field in mold casting whose speed is1.5m/min,2m/min,2.5m/min, results show that the casting speed control to obtain stable flow field and temperature field of2m/min. When the depth of immersion were150mm,200mm,250mm conditions, the flow analysis, results showed that the immersion nozzle control effect at200mm is ideal, which can give full play to the effectiveness of protecting slag, protect the surface of the molten steel in mould is relatively stable. The superheat temperature contours were30℃and10℃were analyzed, results showed that the degree of superheat control in10℃, this is conducive to the formation of equiaxed zone, improve the quality of billet. For the analysis of different viscosity of steel, the results show that when the superheat at10℃to30℃the viscosity changes have little effect on the flow field, but when the superheat is below10℃, the viscosity increases with decreasing temperature.The actual production process shows that the casting speed control in2m/min,200mm, depth of immersion in molten steel superheat control in10℃, flow field in the mold and the temperature field distribution is the most reasonable, greatly improving the casting yield; at the same time, improvement of crystallizer copper plate upper water cooling intensity to improve uniformity cooling, reduce has the vital significance of accidents.In a word, the reasonable casting speed, immersion depth of nozzle, superheat of liquid steel can obtain higher qualified slab. The results of the study provide a reference for optimizing the production process parameters, which is of great significance to enhance the quality of billet.