锻压技术

泡沫铝三明治板材U型弯曲成形变压边力控制研究

英文标题：Study on variable blank holderforce control in foam aluminum sandwich panel U-bending

作者：孙振忠陈海彬

分类号：TG386

出版年,卷(期):页码：2010,35(4):44-48

摘要：

研究了泡沫铝三明治板材U型弯曲工艺，综合运用试验、塑性力学理论分析了泡沫铝三明治板材冲压成形边缘泡沫铝挤出、界面剥离、剪应力裂纹、拉伸裂纹、过度减薄等主要成形缺陷及形成机制。通过成形分析，提出了变压边力工艺控制方法。经过3个阶段变压边力控制，使成形深度由23.1 mm提高到40 mm左右，显著提高了AFS板材成形极限和成形质量。

U-bending process of aluminium foam sandwich (AFS) was studied. Major deformation defects of AFS forming, such as the specimen lateral foam extrusion, the delamination between panel and foam core, shear stress cracks of foam core, the tensile stress cracks of foam core and the excessive thinning of panels were analyzed synthetically by using experiments and plastic mechanics theory. And the deformation mechanism of AFS defects was studied also. Variable blank holder force（VBHF）control method was proposed by deformation analysis. The forming depth increases from 23.1 mm to 40 mm by three stage VBHF control, which has a good effect on promoting the forming limitation and the quality of AFS.

基金项目：

广东省自然科学基金资助项目（T301123）

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