两道次板材渐进成形过程仿真与实验验证
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重庆市自然科学基金重点资助项目(CSTC 2009BA4065)


Numerical simulation and experimental investigation of double-stage sheet incremental forming
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    摘要:

    针对渐进成形工艺加工侧壁较陡零件时板材厚度减薄严重的问题,通过建立基于ABAQUS的两道次板材渐进成形有限元模型,比较单道次与两道次成形路径下零件厚度分布和等效塑性应变历史变化规律,研究了两道次成形策略对板材成形极限的影响。结果显示,与单道次成形件相比,两道次成形件变形量最大的区域离零件底部更近,在所选A、B、C 3点处的等效塑性应变最大值分别减小了66.2%、81.9%和36.0%,且板材变形更加均匀,使零件最小厚度增加了16%左右,表明两道次成形路径能大幅提高板材成形极限。经实验验证,数值模拟结果基本与实际吻合。

    Abstract:

    In order to find a method to reduce excessive sheet thinning in the forming process of small half-apex angle parts by incremental sheet forming, a finite element model (FEM) for simulating double-stage process is developed in ABAQUS. Then, the simulation results, such as sheet thickness distribution and equivalent plastic strain history, are compared with those of single-stage simulation. The effects of double-stage on formability of sheet are discussed. The results show that using double-stage process instead of single-stage in forming parts, the maximum deformation is nearer to the parts’ bottom surface, and the maximum equivalent plastic strain of node A, B, C is reduced by 66.2%, 81.9% and 36.0% respectively. The sheet thickness is better distributed, and the minimum thickness increases by 16%. In addition, double-stage incremental forming can greatly improve the formability of sheet. The simulation results are in a good agreement with experimental results.

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周杰,胡建标,张旭,李军超.两道次板材渐进成形过程仿真与实验验证[J].重庆大学学报,2011,34(7):46-50.

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  • 收稿日期:2011-03-30
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