共查询到18条相似文献,搜索用时 156 毫秒
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渣池深度是电渣熔铸过程中重要的工艺参数之一,它直接影响到熔铸过程的稳定和产品质量.而自耗电极与渣池的接触界面是整个熔铸系统能量的入口,其形貌对熔铸过程的分析和研究非常重要.本文在试验的基础上对不同渣池深度条件下自耗电极的熔化过程进行了模拟研究,获得了不同渣池深度情况下自耗电极末端的形状,为实际生产中优化工艺参数和提高生产效率提供了重要依据. 相似文献
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传统电渣熔铸结晶器多为纯铜中空圆柱体,结构简单,一般由一个结晶器和底板组成,铸件成圆柱体,可为下道工序提供高质量坯料。 本文根据曲轴结构,设计多块异型结晶器,组成复合结晶器,配合托盘小车,采用熔铸工艺,一次铸一拐,分次熔铸各拐连成一体制成曲轴。 熔铸机理:将高碱度熔渣熔化至熔融态,倒入结晶器,自耗电极插入渣池送电,靠双极串联与熔渣形成回 相似文献
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电渣熔铸是一种将精炼和成形相结合的技术,在实际生产中既要充分发挥它在材料提纯精炼方面的优势,又要兼顾生产效率和生产成本等因素,因此是一个典型的多目标组合优化的问题。为此,提出了用电极锥头提纯系数、自耗电极熔化率和有效功率因数3个指标作为最终优化目标,以熔铸电流、渣池深度和冷却水流量为设计变量,基于人工神经网络和遗传算法理论,在Matlab平台上建立了电渣熔铸工艺参数的多目标优化系统,较好地协调了3个指标的相互关系,并预测了最佳的工艺参数组合。 相似文献
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电渣熔铸过程中熔渣的流动决定了熔铸体系温度场的分布以及金属熔池的形状,最终影响熔铸钢锭的质量。采用大型通用有限元分析软件ANSYS,对电渣熔铸体系渣池流场进行了模拟研究,所得结果与物理模拟实验结果完全一致。并以此研究了熔铸电流,填充比和电极端部形状对熔渣流速分布的影响,为实际生产提供了依据。 相似文献
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从高温渣池的热电场耦合模拟入手,利用能量守恒的方法计算了在多种熔铸条件下电极的熔化率及电流的有效功率因数。从理论上验证了采用适中的熔铸电流以及较浅的渣池可以有效提高电能的利用率,降低产品的生产成本,对实际生产过程中节能降耗具有指导意义。 相似文献
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《中国铸造》2015,(4)
The vibrating electrode method was proposed in the electro-slag remelting(ESR) process in this paper,and the effect of vibrating electrode on the solidification structure of ingot was studied.A transient threedimensional(3D) coupled mathematical model was established to simulate the electromagnetic phenomenon,fluid flow as well as pool shape in the ESR process with the vibrating electrode.The finite element volume method is developed to solve the electromagnetic field using ANSYS mechanical APDL software.Moreover,the electromagnetic force and Joule heating are interpolated as the source term of the momentum and energy equations.The multi-physical fields have been investigated and compared between the traditional electrode and the vibrating electrode in the ESR process.The results show that the drop process of metal droplets with the traditional electrode is scattered randomly.However,the drop process of metal droplets with the vibrating electrode is periodic.The highest temperature of slag layer with the vibrating electrode is higher than that with the traditional electrode,which can increase the melting rate due to the enhanced heat transfer in the vicinity of the electrode tip.The results also show that when the amplitude and frequency of the vibrating electrode increase,the cycle of drop process of metal droplets decreases significantly. 相似文献
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针对电渣熔铸钢锭各部位温差大,易产生热应力及测量困难的特点,采用大型有限元分析软件ANSYS,对电渣熔铸过程中不同渣池深度时的钢锭等效应力场进行了模拟研究,得出钢锭最大等效应力与渣池深度之间存在二次函数关系。模拟结果与实际相吻合,运用此模型可预报钢锭应力场状况,对实际生产提供参考。 相似文献
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电渣重熔体系内磁场的数学模拟 总被引:5,自引:0,他引:5
基于Maxwell方程组及有关的电磁场理论,提出了更切合实际情况的电渣重熔体系内磁场的数学模型,并应用于结晶器直径200mm的实验室重熔装置.对直径76mm低碳低合金钢电极的重熔过程(3000A(有效值),CaF2+30mass%Al2O3+20mass%CaO渣系),结果表明,磁场强度的幅模在电极内沿端部锥体形成方向不断增大,至接近锥顶处达最大值,约为2.6×104A/m,此后在渣池、锭子熔池、液固两相区和固态锭子内沿轴向向下逐渐减小;沿半径方向,在电极和渣池内呈现一峰值,在液、固金属区内则单调增大至边界条件限定值.对在直径140mm的结晶器中以直径80mm的电极和CaF2+CaO+Al2O3+MgO渣系生产高速钢(M2)锭的过程,以该模型估计的重熔体系渣池和金属熔池内磁场强度(幅模)的大小和分布与实测结果较相吻合.该模型可作为研究电渣重熔体系内熔体流动,传热和传质过程的基础. 相似文献
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采用流场数值模拟软件模拟了转炉熔渣溅渣护炉气化脱磷过程,探究了熔池深度和熔渣粘度对熔池流动的影响。结果表明,熔池深度越深,越有利于湍动能转换率的提高和熔池内的混匀,优化流场。死区占比随熔渣粘度的增高而增大,所以相应在高粘度深熔池中,需要增加喷吹时间才能使熔池达到稳定、均匀的效果。 相似文献
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The electrode configuration determines the thermophysical field during the electroslag remelting(ESR) process and affects the final microstructure of the ingot. In this work, ingot with a diameter of 400 mm was prepared with two electrode configuration modes of single power ESR process, namely one electrode(OE) and two series-connected electrodes(TSCE). Finite element simulation was employed to calculate the electromagnetic field, flow field and temperature field of the ESR system. The results show that the temperature of the slag pool and the metal pool of the TSCE process is lower and more uniform than that of the OE process.The calculated temperature distribution of the ingot could be indirectly verified from the shape of the metal pool by the experiment. The experimental results show that the depth of the metal pool in the OE ingot is about 160 mm, while the depth of the TSCE ingot is nearly 40 mm shallower than that of the OE ingot. Microstructural comparisons indicate that coarse eutectic carbides are formed in the center of the OE ingot, whereas more even eutectic carbides appear in the center of the TSCE ingot. In general, compared with the OE process, the TSCE process is preferred to remelt high speed steel ingots. 相似文献