热顶—电磁成型系统模拟与实验研究

【作者】 曲若家；

【导师】 张兴国；

【作者基本信息】 大连理工大学 ， 材料加工工程， 2004， 硕士

【摘要】 本文将热顶铸造的思想引入到电磁连铸中，即在结晶器上加热顶，可减小液面波动，稳定弯月面；适当减小结晶器的高度，可削弱结晶器对磁场的屏蔽作用，提高电源效率。本文针对热顶—电磁连铸过程进行了模拟与实验研究，测量了电磁连铸结晶器内的磁感应强度，找出其基本分布规律，并确定了电磁连铸的合理工艺参数；用有限元法进行了三维电磁场数值模拟；计算了结晶器高度和线圈结构位置等对结晶器内部磁场的影响规律，结果表明：降低结晶器的高度可使结晶器内磁场分布略有提高，但是感应线圈的高度对磁场影响显著，20mm高线圈的磁感应强度较40mm的提高85％；将热顶引入电磁连铸技术上，模拟其对结晶器内部磁场的影响规律，模拟结果还显示热顶结构对磁场强度与分布影响不大。为热顶一电磁连铸系统设计提供了依据。 依据电磁场的实验和模拟结果设计了一套完整的热顶—电磁连铸成型系统。包括结晶器、感应器、冷却水套、热顶等的设计。应用设计的电磁连铸成型系统进行了大量工艺实验，确定了合理的液柱高度、浇注温度、冷却水量和铸造速度等工艺参数，并成功制取了表面较光亮的铝合金圆锭。更多还原

【Abstract】 In this paper, the idea of hot-top is leaded in the electromagnetic continuous casting. The hot-top which is added on the mold can reduce the surface fluctuation and stabilize the meniscus. Reducing the height of the mold can weaken the shielding effect of the mold and improve the efficiency of the power. Aim at hot-top electromagnetic continuous casting, simulation and experimental research have been done, the distribution of the magnetic flux density in continuous casting mold was measured and the rational technique parameters were obtained by lots of experiments. The finite element method has been used to numerically simulate the influences on magnetic flux density and the distribution in terms of the height of the mold and the structure of the inductor, the results show that reducing the height of the mold can enhance magnetic flux density in the system, but it isn’t obvious, The height of the inductor has measurably effect on the magnetic field. Using the inductor with 20mm height can increase the magnetic flux density to 85 percent than using the inductor with 40mm height. And the simulating results show that hot-top hasn’t obvious influence on the magnetic flux density and distribution. Thereby, foundation is supplied to designing the hot-top electromagnetic continuous casting system.According to the experimental and simulation results, a set of hot-top electromagnetic continuous casting system including mold, inductor, cooling water jacket and hot-top has been established. Using this system, the rational technique parameters such as the pouring position, pouring temperature, cooling water strength and the casting speed have been determined by lots of experiments, and an ingot with smooth surface has been obtained.更多还原