多缝隙集磁器的磁脉冲管件缩径成形及连接

Diameter reduction forming and welding of magnetic pulse tube for multi-slit magnetic collector

磁脉冲管件缩径是金属管件与金属或者非金属管件、杆件连接时使用的一种高速成形工艺。集磁器能显著提高磁脉冲的焊接效率。传统集磁器中通常存在一个缝隙,用于改变感应电流流向,进而调控磁力分布。缝隙的存在使得电磁力在周向上分布不均,靠近缝隙处的区域难以焊接,这种缺陷降低了磁脉冲管件缩径的周向均匀性。为了提高磁脉冲管件缩径的均匀性,提出了一种多缝隙集磁器结构,并研究了缝隙数目N对磁脉冲管件缩径性能的影响,最终通过电磁力分布与成形结果确定了N=4为较好的工艺参数。结果表明,带有多缝隙集磁器的磁脉冲管件缩径系统能够显著提高管件自由缩径与磁脉冲焊接周向成形的均匀性。

The diameter reduction of magnetic pulse tube is a kind of high speed forming process used in connecting metal tube with metal or non-metal tube and rod,and the magnetic collector can significantly improve the welding efficiency of magnetic pulse.However,in traditional magnetic collector,there is usually a slit for changing the induced current direction to regulate the magnetic force distribution,and the area near the slit is difficult to weld because the existence of slit makes the electromagnetic force unevenly distributed in circumferential direction,which reduces the circumferential uniformity of diameter reduction for magnetic pulse tube.In order to improve its uniformity,a multi-slit magnetic collector structure was proposed,and the influence of the number of slits N on the diameter reduction performance of magnetic pulse tube was studied.Finally,N=4 was determined as a better process parameters by electromagnetic force distribution and forming results.The results show that the diameter reduction system with multi-slit magnetic collector of magnetic pulse tube significantly improves the uniformity of free diameter reduction and circumferential forming of magnetic pulse welding.