自激励式电磁铆接放电电流分析

电磁铆接是一种将电磁能转化为机械能的铆接工艺。传统感应式低电压电磁铆接存在能量利用率低、难以解决高强度大直径铆钉和难成形材料铆钉的铆接等问题。基于自激励式电磁铆接技术,建立放电电流分析模型,通过数值分析与工艺试验探讨自激励式电磁铆接进行大直径铆钉成形的可行性。研究结果表明建立的电磁铆接放电电流分析模型可实现传统感应式和自激励式电磁铆接放电电流分析,分析结果与试验吻合较好;放电能量相同时,自激励式电磁铆接的涡流斥力峰值要远大于感应式的涡流斥力,能有效提高能量利用率,是实现大直径铆钉成形的有效方式;在放电电压为320V时,自激励式电磁铆接可实现直径为10mm的45号钢铆钉的成形,其变形以绝热剪切的方式进行。

Discharge current in self-excited electromagnetic riveting

Electromagnetic riveting is a riveting technology for transforming electromagnetic energy into mechanical energy.By traditional induction low voltage electromagnetic riveting,it is difficult to solve the problems of low energy efficiency,and riveting of high strength and large diameter rivet and hard forming material rivet.Based on self-excited electromagnetic riveting technology,the analysis model of discharge current is established.The feasibility of large diameter rivet forming is investigated by numerical analysis and process experiment.The results show that the model for discharge current analysis can realize the discharge current analysis of traditional induction and self-excited electromagnetic riveting.The analysis results are in good agreement with those of the experiment.When the discharge energy is the same,the eddy current repulsion peak of the self-excited electromagnetic riveting is much larger than that of the induction.The self-excited electromagnetic riveting can effectively improve the energy utilization rate,and is the effective way for the forming of large diameter rivets.When the discharge voltage is 320 V,self-excited electromagnetic riveting can deform the 45 steel rivet with 10 mm diameter,and the rivet deformation is carried out by adiabatic shearing.