行波磁场发生器上磁场分布及其熔体充型特征

吕国伟; 苏彦庆; 毕维生; 郭景杰

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行波磁场发生器上磁场分布及其熔体充型特征
Magnetic Field Distribution in the Traveling Magnetic Field Generator for Electromagnetic Casting and Its Influences on the Filling Process
2007年第12期页码：957-959
纸质出版日期： 2007 ，
DOI：

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[1]吕国伟,苏彦庆,毕维生,郭景杰.行波磁场发生器上磁场分布及其熔体充型特征[J].特种铸造及有色合金,2007(12):957-959+900-901.

Lü Guowei1, Su Yanqing2, Bi Weisheng2, et al. Magnetic Field Distribution in the Traveling Magnetic Field Generator for Electromagnetic Casting and Its Influences on the Filling Process[J]. Special Casting & Nonferrous Alloys, 2007,(12):957-959.
[1]吕国伟,苏彦庆,毕维生,郭景杰.行波磁场发生器上磁场分布及其熔体充型特征[J].特种铸造及有色合金,2007(12):957-959+900-901. DOI：

Lü Guowei1, Su Yanqing2, Bi Weisheng2, et al. Magnetic Field Distribution in the Traveling Magnetic Field Generator for Electromagnetic Casting and Its Influences on the Filling Process[J]. Special Casting & Nonferrous Alloys, 2007,(12):957-959. DOI：

摘要

利用ANSYS软件

计算了行波磁场发生器上方的磁场变化规律

并与试验检测结果进行了对比

两者结果吻合较好。发现了与行波磁场极距相关的临界熔体长度现象

当熔体长度小于临界长度时

行波磁场对熔体的运动不产生影响

该临界长度与极距有关。金属熔体在行波磁场铸造充型过程中受到6个力的作用

这6个力共同作用的结果使熔体充型过程中速度的变化存在加速、匀速、减速的变化规律

解释了与此相对应的铸造缺陷如冷隔、浇不足等形成的原因

并提出了两种改变磁场分布的方法。ANSYS计算结果表明

用这两种方法可以实现递减分布的磁场。

Abstract

The magnetic field distribution in a traveling magnetic field generator was calculated with ANSYS software

which was well in agreement with the experimental ones.A critical length related to the polar distance of traveling magnetic field was obtained.The traveling magnetic field is independent on the move of liquid alloy with the length of liquid alloy lower than critical length.The six forces were exerted on liquid alloy during filling in traveling magnetic field casting

leading to the flow change from accelerate to constant to decelerate

which be responsible for the formation of defects

such as cold shut

misrun.Two methods to change the distribution of magnetic field were put forward.The ANSYS results show that the two ways can realize the gradient-reduction distribution of magnetic field.