5182铝合金椭圆孔电磁翻边数值模拟研究

目的 研究异形孔电磁翻边成形规律及不同预制孔尺寸对翻边质量的影响.方法 基于电磁成形平台实现椭圆孔电磁翻边试验,建立三维电磁成形仿真模型对3种预制孔的翻边过程进行模拟.通过显微硬度值、翻边轮廓、翻边高度及端部厚度等指标分析异形孔电磁翻边规律.结果 3种预制孔的翻边高度均表现为从长轴到短轴不断增大,随着预置高度从15 m...

Numerical Simulation Study on Oblique Hole-Flanging with 5182 Aluminum Alloy Produced by Electromagnetic Forming (EMF)

This paper aims to study the mechanism of oblique hole flanging conducted by electromagnetic forming (EMF) and the effect of prefabricated hole on flanging quality. Experimental works based on the EMF platform and 3D numerical model were carried out to simulate the electromagnetic flanging processof three kinds of prefabricated holes. The rule of electromagnetic flanging of special shaped hole was analyzed by microhardness value, flanging contour, flanging height and end thickness. The results show that flanging heights of all three types of prefabricated holes exhibitincreasing from the long axis to the short axis, and the difference in flap height between the long and short axis decreases from 2 mm to 0.75 mm as the preset height decreases from 15 mm to 10 mm and the fit of the flap parts to the mold gradually becomes better. There are obvious differences in the deformation of electromagnetic flanging parts in the long and short axis. Based on the principle of neutral layer invariance, the formula of prefabricated hole underestimates the electromagnetic flanging height when the side wall fits well with the mold. Better die gap fitness and uniform flanging height could be achieved by more uniform magnetic force density generated in deforming region.