Numerical Simulation For Temperature And Flow Field In Mold Based On Electromagnetic Brake Technology

High casting speed is the core of high efficient continuous casting. The fluctuation of liquid level aggravates and solidified shell thickness reduces with the increase of casting speed, which results the increase of inclusion, generation surface crack and the dangerous of breakout. The application of electromagnetic brake is very important to improve productivity and casting blank quality.The method of numerical simulation was used to research the continuous casting mold of the fourth steel roling of Masteel. The behavior of liquid steel in electromagnetic brake, the effect of electromagnetic brake and the distribute of magnetic density in the mold were contained in the study. According to the conditon of continuous product in Masteel, the influence of casting speed, superheat and casting blank cross-section on the flow field, temperature field and the solidification behavior of liquid steel in mold were researched.Under the experimental condition, the electromagnetic brake doesn't change the double back flow shape of flow field, though can reduce the flow rate of liquid steel in upon back flow, narrow the region of the lower back flow and reduce the depth of jet. Under the effect of electromagnetic brake, the maximum speed on the center line of mold decreases from 0.17m/s to 0.04m/s and the maximum speed on the liquid level decreases from 0.17m/s to 0.02m/s. The technology of electromagnetic brake gets the surface temperature of solidification shell down and makes the shell increase. Compared to the result without electromagnetic brake, the shell temperature on the center of the exit of narrow side in the mold decreases from 1466K to 1366K and the shell increases from 11mm to 15mm. If the casting speed gets up, the liquid level speed increases. When the casting speed is enhanced from 1.1m/min to 1.5m/min, the max speed on the liquid level increases from 0.14m/s to 0.21m/s. Because of the effect of casting speed, the shell temperature increases and the shell thickness becomes thin. When the casting speed is 1.1, 1.3, 1.5(m/min), the shell temperature of the exit of narrow side in the mold is 1375K, 1446.5K, 1512.8K respectively and the shell thickness is 13mm, 11mm, 10mm respectively. The shell temperature increases and the shell thickness decreases with the superheat increase. When the superheat is 25K, 30K, 35K, the shell temperature of the exit of narrow side in the mold is 1460.8K, 1513.5K, 1569.5K and the shell thickness is 10mm, 8mm, 6mm. When the casting blank cross-section is 230×1400, 230×1600, 230×1800(mm), the region of back flow and the depth of jet increase, but the shell temperature and the shell thickness of the exit of the mold don't change, the temperature of liquid level reduces. Based on the result of numerical simulation, the control extent of casting speed and superheat were researched under the experimental condition.