变截面送料双频电磁成形过程的稳定性

电磁成形技术是1种能同时实现固态坯料加热熔化和液态金属约束成形的新型材料制备技术，适用于中小尺寸活泼金属，高温合金，难熔金属和高纯金属的加热熔化及其复杂截面构（坯）件的无容器近终成形，分析影响金属熔体变截面送料双频电磁成形稳定性的因素，研究表明：（1）影响液态金属双频电磁成形的因素有：液柱高度、试样表面的磁感应强度大小和液态金属的表面张力，3者满足确定的关系，才能保证液态金属电磁成形的稳定性；（2）屏蔽罩与成形感应圈的配置，两感应圈的间距和抽拉速度等工艺参数的合理控制对成形稳定起到重要作用。

Study on Stability in Dual-frequency Electromagnetic Shaping for Parts with Variable Cross-section Feeding

Electromagnetic confinement and shaping of molten metals is a novel mouldless technique and has aroused much attention as an important branch of electromagnetic processing of materials. Because there is no contact between mould and liquid metals, no contamination occurs during melting and solidification , the technique is considered to be suitable for melting pure metals, superalloy, titanium alloys and other alloys with active elements and small or medium size and manufacturing their parts with complex cross section. In this paper, some factors are analyzed which influence the process of dual frequency electromagnetic shaping for parts with variable cross section feeding. The results indicate that factors which influence the process of dual frequency electromagnetic shaping for parts with Variable cross section feeding are melt height , magnetic flux density on melt surface and surface tension of liquid metal .In order to ensure the stability ,they must settle for the determinding relations . The configure of screen and shaping coil ,space of two coils and drawing speed play an important role on stability in dual frequency electromagnetic shaping for parts with variable cross section feeding.