无氧铜连铸坯坯壳生长及收缩补偿研究

发布时间：2018-08-16 15:46

【摘要】：结晶器是板坯连铸机列的核心部件。掌握铸坯在不同工艺条件下其内部的温度场、液穴、应力场分布情况以及彼此之间的规律,对优化工艺参数、提高铸坯质量有决定性的作用。以某铜加工厂连铸机为研究对象,通过PROCAST软件分别对不同工艺条件下温度场、液穴、应力场进行分析,探究不同工艺条件对温度场、液穴及应力场的影响;通过MATLAB拟合函数,找出不同工艺条件与铸坯在结晶器出口处温度之间的函数关系,分析其规律;研究了铸坯的收缩补偿措施,对收缩系数以及倒锥度与尺寸偏差、气隙的关系进行了分析。分析结果表明:冷却水量、拉坯速度、浇注温度以及铸坯宽厚比对铸坯的温度场、液穴与应力场均有显著影响;在工艺条件允许下,降低冷却水量、浇注温度、铸坯宽厚比和提高拉坯速度有利于降低铸坯温度场的温度梯度和减小铸坯内应力,对提高铸坯质量有明显帮助;增大二冷区的冷却水量可以有效降低铸坯的温度;拟合函数表明:不同工艺条件与铸坯在结晶器出口处温度呈明显的函数关系,对于企业生产有重要的指导意义;收缩补偿措施的研究表明:倒锥度较小时,尺寸偏差与气隙都较小;收缩系数较大时,尺寸偏差较小,而气隙反而变大。
[Abstract]:The mould is the core component of slab continuous casting machine. Mastering the distribution of temperature field, liquid hole, stress field and the law of each other in the billet under different technological conditions plays a decisive role in optimizing the technological parameters and improving the quality of the billet. Taking the continuous casting machine of a copper processing plant as the research object, the temperature field, the liquid cavity and the stress field under different technological conditions were analyzed by PROCAST software, and the effects of different process conditions on the temperature field, liquid cavity and stress field were explored, and the MATLAB fitting function was used to fit the temperature field, the liquid cavity and the stress field. The functional relationship between the different process conditions and the temperature at the exit of the mould is found out, and the law of the billet shrinkage compensation is analyzed. The shrinkage coefficient, the deviation between the inverted taper and the dimension, and the air gap are analyzed. The results show that the temperature field of cooling water, casting speed, casting temperature and the ratio of casting width to thickness have significant effects on the temperature field and stress field of the billet, and the cooling water quantity and pouring temperature can be reduced when the technological conditions permit. The ratio of width to thickness and the speed of billet drawing can decrease the temperature gradient and stress of the billet, which is helpful to improve the quality of the billet, to increase the cooling water in the secondary cooling zone can effectively reduce the temperature of the billet, and to reduce the temperature of the billet by increasing the cooling water content in the secondary cooling zone. The fitting function shows that the different process conditions have obvious function relationship with the temperature at the exit of the mould, which has important guiding significance for the production of the enterprise, and the research of the shrinkage compensation measures shows that the inverted taper is small, The size deviation and air gap are smaller, and when the shrinkage coefficient is larger, the dimension deviation is smaller, but the air gap becomes larger.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG291

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