针对大型铝合金曲面件电磁渐进成形技术,采用整体压边和分块变压边力压边的方式,研究了电磁渐进成形工艺中首次放电后板料的起皱现象和规律,揭示了压边力对电磁渐进成形首次放电过程中板料起皱和材料塑性流动行为的影响.结果表明:数值模拟结果预测出的首次放电后易起皱区域为板料的法兰区和悬空侧壁区,与实验结果一致;整体压边方式下法兰区域和悬空侧壁区域无起皱的临界压边力分别为8.4 kN和21.6 kN;分块变压边力方式下,最靠近局部塑性变形区的压边分块上的法兰区域无起皱临界压边力为8.4 kN,最靠近悬空区的对称的两个压边分块上的悬空侧壁区域无起皱临界压边力为23.8 kN,且相比于整体压边方式的无起皱临界条件下,在分块压边方式的无起皱临界条件下板料的变形流动能力得以明显提高.
The whole blank holder and segment blank holder were used to study the wrinkling behaviors and rules after the first discharge forming in electromagnetic incremental forming process of large aluminum alloy curved surface parts. The effect of blank?holder force on wrinkling behavior and plastic flow was revealed. The results of numerical simulation showed that the flange zone and floating sidewall zone are easy to wrinkle, which is in good agreement with the experimental re?sults. Under the condition of whole blank holder, the values of blank?holder force in critical flange wrinkle condition and floating sidewall wrinkle condition are 8. 4 kN and 21. 6 kN. Under the condition of segment blank holder, the value of blank?holder force on the segment nearest plastically deforming area in critical flange wrinkle condition is 8. 4 kN, and the value of blank?holder force on two symmetrical segments nearest floating sidewall in critical floating sidewall wrinkle condi?tion is 23. 8 kN. Compared with the whole blank holder, the material flow behavior can be greatly improved by means of segment blank holder.
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