模铸过程中氩气保护系统的研究

STUDY ON ARGON PROTECTION SYSTEM IN MOULD CASTING PROCESS

研究了底注钢锭氩气保护的原理及效果,设计并制作了专用的钢包水口与浇口杯间氩气保护装置,将氩气保护系统由开放式调整为密封式。经过生产实践验证,上大下小圆锥形、下部设置氩气入口是吹氩保护罩的最佳结构形式,对钢包滑动水口实施密封处理,可进一步提高保护效果;氩气压力保持在0.5 MPa以上,可使保护罩内气氛形成微正压,提高钢流保护效果。优化后,钢液实际增氧量下降54.7%,夹杂物下降53.3%,铸锭质量大幅提高。

The principle and effect of argon protection for bottom ingot are studied.A special argon protection device between ladle nozzle and gate cup is designed and made.The argon protection system is adjusted from the open type to the sealed type.Through the production practice,it is proved that the best structure of argon blowing protective cover is large and small conical shape with argon inlet at the bottom,and the sealing treatment of ladle sliding nozzle can further improve the protection effect.When the argon pressure is kept above 0.5 MPa,the atmosphere in the protective shield can form micro-positive pressure,and the protective effect of steel flow can be improved.After optimization,the actual oxygen increment of molten steel decreases by 54.7%,the inclusion decreases by 53.5%,and the quality of ingot is greatly improved.