摘要
采用数值模拟的方法研究了铝合金空心管坯电磁铸造中磁场的分布规律·建立了包括水冷芯、外结晶器、铸锭及内/外两个线圈的二维轴对称有限元模型·通过求解磁矢势微分方程,确定了磁感应强度在空间的分布·计算结果表明:铸造过程中内外线圈相互作用,外线圈电流约为内线圈的一半时,磁感应强度分布比较均匀;线圈电流频率和相位是空心管坯电磁铸造中重要的工艺参数,适当增加频率,管的内表面侧磁感应强度明显增强;相位影响磁感应强度梯度的大小和方向·
Distribution of magnetic field in electromagnetic continuous casting process of Al-alloy hollow billets is studied by way of numerical simulation. A two-dimensional axis-symmetric finite element model is established including relevant water-cooled core, outer mould, ingot, inner and outer induction coils. The spatial distribution of magnetic induction is determined by solving the differential equations of magnetic vector potential. Calculated results show that during electromagnetic casting the inner and outer induction coils interact with each other, and the distribution of magnetic induction is found more homogeneous when the outer induction coil current is set to about a half of inner induction coil current. The frequency and phase of coil current are important parameters during electromagnetic casting of hollow billets, the magnetic induction on inside wall surface of pipe increases notable if increasing appropriately the frequency, while the phase will affect the magnitude and direction of magnetic induction gradient.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第3期244-247,共4页
Journal of Northeastern University(Natural Science)
基金
国家高技术研究发展计划项目(2001AA332030).
关键词
铝合金
空心管坯
电磁场
连续铸造
有限元
数值模拟
aluminum alloy
hollow billet
electromagnetic field
continuous casting
finite element
numerical simulation
