3003铝合金激光冲击微挤压成形研究

Investigation into micro-extrusion forming based on laser shock in 3003 aluminum alloy

微挤压模约束下的激光冲击微体积成形技术是利用激光诱导的冲击波使局部金属在凹模约束下产生体积变形的一种成形新技术。为了分析不同板厚(0.12mm,0.15mm,0.17mm和0.22mm)的3003铝合金在不同凹模孔径(0.4mm,0.7mm,0.9mm和1.1mm)约束下的成形深度,采用建立有限元模型进行数值分析的方法,进行了理论分析和实验验证,取得了不同板厚和不同孔径成形下成形深度的数据。结果表明,成形深度随板厚的增大而增大趋势逐渐减小;对于同一厚度,板料成形深度随孔径的增大呈非线性增大趋势;对于同一点冲击,冲击次数对板料的成形深度影响很大。数值分析结果与实验吻合度较好,这一结果对微体积成形质量控制是有帮助的。

The micro-bulk forming with laser shock under the restriction of micro-extrusion die is a kind of new forming technology, which utilizes shockwave induced by laser to produce volume deformation of local sheet metal under the constraint of the die. A model of micro-extrusion of laser shock was developed to analyze the forming depth of different sheet thickness （0.12mm, O. 15mm, 0.17mm and 0.22mm） of 3003 aluminum alloy under different diameters of the micro-dies （0.4mm, 0. 7mm, 0.9mm and 1. lmm）. After establishing finite element model for numerical analysis, theoretical analysis and experimental verification were carried out and the data of the forming depth were obtained under different thickness and different diameters of the micro-dies. The results show that the forming depth increases sharply, then slowly with the increase of sheet thickness. For the same thickness, the sheet forming depth increases with the increase of diameter of the micro-die in a non-hnear way. For the single shock, the number of shock has a sreat influence on the sheet forming depth. It is found that the simulation results are in accordance with experimental results, which gives support for the quality control of micro-bulk forming.