中间包板间密封不良的原因分析和改进

Cause analysis and improvement of poor sealing between slide surface of tundish

针对连铸机生产过程因中间包板间密封不良导致的钢液二次氧化和板间滋钢问题,现场跟踪系统分析了快换机构油缸、机构滑道、机构弹簧压力、水口烘烤及水口板面等因素对密封效果的影响。分析结果表明,板间密封主要与快换机构设备精度、烘烤工艺操作及水口板面质量有关。通过提升快换机构滑道维护标准、提高弹簧压力、规范油缸行程,优化上水口和浸入式水口烘烤制度,规范板面平整度,板面涂抹石墨质涂料,推行精细化操作等措施,连铸生产过程中中间包板间密封效果大幅提升,板间密封氩气背压合格率由75%提高至98%,板间吸气造成的结晶器液位波动大于±3 mm发生率由3.0%降低至0.1%以下,板间滋钢发生率由1.5%降低至0.01%以下。

In order to solve the problems of secondary oxidation of liquid steel and steel spilt between plates caused by poor sealing between tundish plates in the production process of continuous casting machine,the influence of quick change mechanism oil cylinder,mechanism slideway,mechanism spring pressure,water mouth baking and water mouth plate surface on sealing effect was analyzed by field tracking system.The results show that the lax sealing between plates is mainly related to the equipment accuracy of the quick change mechanism,the surface quality of the nozzle plate and the baking process operation.By monitoring the slide and spring pressure of the quick change mechanism,optimizing the baking system of the upper nozzle and submerged nozzle,standardizing the flatness of the plate surface,applying graphite emulsion on the plate surface,and implementing fine operation,the sealing performance between tundish plates is greatly improved in the process of continuous casting production,the qualified rate of argon pressure of inter plate seal was increased from 75%to 98%,and the occurrence rate of mold liquid level fluctuation over±3 mm caused by inter plate suction decreased from 3.0%to less than 0.1%,the steel growth rate between plates is reduced from 1.5%to less than 0.01%.