电磁搅拌技术在铜管水平连铸生产中的应用研究

Application of Electromagnetic Stirring Technologies in Cooper Tube Production used Horizontal Continuous Casting

在传统铜管水平连铸的基础上应用电磁搅拌原理开发了电磁连铸技术,采用结晶器外施加电磁场的方法来提高铜管铸坯的质量。当铜液在交变电磁场中运动时产生感应电流,感应电流和交变磁场相互作用,产生作用于初始坯壳、指向液芯的电磁力。其径向分力减小了铜液与结晶器内壁之间的接触压力,继而减小了拉坯摩擦阻力,有利于提高铸造管坯的表面质量;其水平方向的分力则促使铜液强迫对流,减小了液穴内的温度梯度,破坏了枝状晶的生长,增加了非自发晶核,细化了晶粒,减少铸坯的内部的疏松、偏析和裂纹等缺陷,提高了凝固组织分布的均匀性,从而达到改善铜管铸坯后续加工性能和提高产品成品率的目的。

The electromagnetic continuous casting technology is studied and developed by using the electromagnetic on the basis of the traditional horizontal tube continuous casting. The quality of the copper blank is improved via magnetic field around mould. The induced current will be created when the copper melt moves in the alternating electromagnetic field. The electromagnetic force which acts on the initial blank and direct to the melt core is caused because of the interaction between the induced current and alternating magnetic field. It＇ s radial force reduces the contact pressure between the copper melt and inner surface of the mould, which will reduce the friction of the drawing tube and improve the surface quality of the copper blank. It＇ s horizontal force increases the convection of the copper melt, which will have a lot of benefits for the blank quality, such as, lowering the temperature gradient of the copper melt, promoting the nucleation, refining grain, reducing the inner segregation and cracks, making the solidification texture more even and so on, thus improve the machinability of the copper blank and the production yield.