锻压技术

渐进成形圆孔翻边变形区厚度减薄现象的模拟研究

英文标题：Numerical simulation for thickness thinning of deformation zone on hole-flanging by incremental forming

作者：曹宇高锦张贾俐俐

分类号：TG376.9

出版年,卷(期):页码：2015,40(2):52-59

摘要：

以Dynaform软件为分析平台构建有限元模型，利用数值模拟方法研究渐进成形圆孔翻边变形区厚度减薄现象。提出了最小厚度的理论计算公式，并验证了其可信性，并以此建立了翻边中部厚度减薄的判定标准。分析了翻边中部厚度减薄现象产生的原因并研究了通过多道次成形来避免减薄现象的可行性。结果表明：单道次渐进成形圆孔翻边K越小成形力越大，使翻边中部板料处于径向拉伸为主的双向受拉状态，从而导致了翻边中部厚度减薄；以减小成形力为准则设计多道次路径渐进成形圆孔翻边可有效的消除单道次成形时出现的翻边中部厚度减薄现象。

Finite element model was established based on software Dynaform. Thickness thinning of deformation zone on hole-flanging by incremental forming was studied. In order to establish the judgment standard of thickness thinning, theoretical calculation formula of the minimum thickness was put forward and its credibility was verified. Causes of thickness thinning of deformation zone were analyzed and the feasibility of avoiding thickness thinning by multi-stage forming was studied. The results indicate that the smaller value of K and the larger value of forming force, which makes the middle area of flange walls undergo biaxial stretching conditions and leads to thickness thinning. Hole-flanging by multi-stage path incremental forming which is designed based on reducing the forming force can avoid thickness thinning effectively.

基金项目：

先进数控技术江苏省高校重点建设实验室基金开放项目（KXJ05017）

曹宇（1990-），男，硕士研究生高锦张（1963-），男，硕士，副教授

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