空心管坯软接触电磁连铸技术研究

提出空心管坯软接触电磁连铸方法,以Sn-3.5%Pb合金为模拟金属,采用激光实测的方法研究了不同电源功率下弯月面形状,并进行了空心管坯软接触电磁连铸实验.研究表明:施加中频电磁场,管坯型腔内熔体形成具有一定高度的悬浮液柱;功率增加,弯月面隆起高度增加,金属熔体与外结晶器之间的接触角增大,接触点位置降低,对金属熔体与内结晶器之间的接触角影响不大,与内结晶器的接触点上升;与普通连铸空心管坯相比,软接触电磁连铸空心管坯的表面质量光洁,凝固组织得到显著细化.

Study on soft-contact electromagnetic continuous casting of hollow billet

Soft contact electromagnetic continuous casting of hollow billet was developed.Sn-3.5%Pb(wt%) was used as experimental material to study the effect of electromagnetic field on meniscus contour and the quality of hollow billets.The results indicate that a suspended melt column with certain height could be formed in the mold while a middle frequency electromagnetic field is imposed;the height of meniscus raises with the increasing of power,the contact angle between melt and outer-mold is increased,the location of contact point descends;the contact angle between melt and inner-mold has no change and the contact point of melt and inner-mold ascents.Compared with that of those produced by using traditional continuous casting techniques,the quality of hollow billets produced by using soft contact electromagnetic continuous casting technique is remarkably improved: surface quality becomes more smooth and solidification structure is refined.