连铸保护渣道动态压力计算模型及影响因素  

Impact factors and mathematical model of dynamic pressure in a mould flux channel

作　　者：王宏明[1] 王振东[1] 李桂荣[1] 赵玉涛[1] 

机构地区：[1]江苏大学材料科学与工程学院,镇江212013

出　　处：《北京科技大学学报》2009年第6期777-781,共5页Journal of University of Science and Technology Beijing

基　　金：国家高技术研究发展计划资助项目(No.2007AA03Z54805);江苏省高技术研究重点资助项目(No.BG2007030);江苏大学高级人才启动基金资助项目(No.07JDG084);江苏省高校自然科学研究计划资助项目(No.05KJD450043)

摘　　要：通过建立保护渣道压力计算模型,研究了保护渣道压力随结晶器振动的周期性变化规律以及保护渣道形状参数、连铸工艺参数和保护渣黏度对渣道压力的影响.结果表明:结晶器达到最大上振速度和最大下振速度时,渣道压力分别达到最大负压和最大正压;保护渣道形状参数对渣道压力有重要影响,渣道入口宽度和出口宽度增加,渣道正负压力都明显下降,而渣道长度增加,渣道正负压力最大值都增加;拉坯速度与结晶器振动速度都影响渣道压力,拉坯速度增加,渣道最大负压增加,而最大正压减小;结晶器振动速度和保护渣黏度增加,使渣道最大正负压力都增加.A mathematical model of dynamic pressure in a mould flux channel was established, and the pressure fluctuation rule was simulated. The effects of mould flux channel shape parameters, continuous casting technical parameters and mould flux viscosity on the pressure were researched. The results indicate that the flux channel pressure comes to the negative maximum and positive max- imum when the mould oscillation velocity reaches the maximum upward velocity and the maximum downward velocity, respectively. The parameters of mould flux channel shape have important effect on the pressure. Both the positive pressure and negative pressure are depressed greatly with the increases of flux channel entrance and exit widths. But the increase of flux channel length makes the pressure large. Both the withdrawal speed and mould oscillation velocity influence the flux channel pressure. With increasing with- drawal speed, the maximum of negative pressure is enlarged, while the maximum of positive pressure is depressed. The increases of mould oscillation velocity and flux viscosity make the maximums of positive pressure and negative pressure enhanced.

关 键 词：连铸 保护渣道 结晶器振动 拉速 振动速度 黏度 

分 类 号：TG249.7[金属学及工艺—铸造] TG111.4