文章信息/Info

Title:

Research on wrinkling behavior after the first discharge in electromagnetic incremental forming process of large aluminum alloy curved surface parts

作者:

龔航1; 黃亮1; 李建軍1; 戴亞雄1; 曹全梁2; 韓小濤2; 李亮2

（1.華中科技大學材料學院材料成形與模具技術國家重點實驗室
（2.華中科技大學國家脈沖強磁場科學中心

Author(s):

GONG Hang; HUANG Liang; LI Jianjun; DAI Yaxiong; CAO Quanliang; HAN Xiaotao; LI Liang

(1.State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology
(2.Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology

關鍵詞:

大型鋁合金曲面件; 分塊壓邊; 起皺; 電磁漸進成形

DOI:

10.7502/j.issn.1674-3962.2016.04.06

文獻標志碼:

A

摘要:

本文針對大型鋁合金曲面件電磁漸進成形技術，采用整體壓邊和分塊變壓邊力壓邊的方式，研究了電磁漸進成形工藝中首次放電后板料的起皺現象和規律，揭示了壓邊力對電磁漸進成形首次放電過程中板料起皺和材料塑性流動行為的影響。結果表明：數值模擬結果預測出的首次放電后易起皺區域為板料的法蘭區和懸空側壁區，與實驗結果一致；整體壓邊方式下法蘭區域和懸空側壁區域無起皺的臨界壓邊力值分別為8.4kN和21.6kN；分塊變壓邊力方式下，最靠近局部塑性變形區的壓邊分塊上的法蘭區域的起皺臨界壓邊力為8.4kN，最靠近懸空區的對稱的兩個壓邊分塊上的懸空側壁區域的起皺臨界壓邊力為23.8kN，且相比于整體壓邊方式的起皺臨界條件下，在分塊壓邊方式的起皺臨界條件下板料的變形流動能力得以明顯提高。

Abstract:

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 after the first discharge forming in electromagnetic incremental forming process was reveled. The results of numerical simulation showed that the flange zone and floating sidewall zone are easily to wrinkle, which is in good agreement with the experimental results. Under the condition of whole blank holder, the values of blank-holder force in critical flange wrinkle condition and floating sidewall wrinkle condition are 8.4kN and 21.6kN. Under the condition of segment blank holder, the values of blank-holder force on the segment nearest plastically deforming area in critical flange wrinkle condition is 8.4kN, and the values of blank-holder force on two symmetrical segments nearest floating sidewall in floating sidewall wrinkle condition is 23.8kN. Compared with the whole blank holder, the material flow behavior can be greatly improved by means of segment blank holder.