行波磁场励磁电流对薄壁件充型和表面缩陷的影响

Influence of the Excitation Current in Traveling Magnetic Field on Mold Filling and Surface Depression of Thin-walled Casts

摘要:

通过使用ansoft软件对筒形薄壁件在不同励磁电流的行波磁场作用下的电磁力进行了分析，进一步研究了行波磁场的励磁电流对合金充型能力以及铸件外表面缩陷的影响。结果发现：行波磁场影响合金充型能力的同时也影响了铸件凝固表面质量；随着励磁电流强度的增加，合金充型能力成平方倍的提高，同时也成平方倍的增加了铸件表面缩陷发生的几率；相同励磁电流强度下，励磁电流频率对合金充型能力存在最优值；励磁电流频率在1000 Hz以下变化时，随着励磁电流频率的降低铸件表面缩陷发生的可能性不断减小。

Abstract:

Ansoft software was used to simulate the electromagnetic force of the cylindrical thin-walled casts under the action of traveling magnetic field, and the influence of excitation currents on mold-filling capacity of different alloys and surface depression of thin-walled casts were investigated. The results show that the magnetic field remarkably influences the mold-filling capacity of alloys and the casting surface depression simultaneously. The mold-filling capacity and the possibility of the surface depression are increased with the square of the excitation current intensity increasing. Under the same excitation current intensity, the excitation current frequency has the optimal value to the mold-filling capacity; the possibility of the casting surface depression decreases along with its decrease below 1000 Hz.