锻压技术

环轧模拟中单元畸变的处理

英文标题：Treatment of element distortion for ring rolling process

作者：上官同英张学宾

单位：中州大学河南科技大学

分类号：TG3；O34

出版年,卷(期):页码：2011,36(6):59-62

摘要：

针对环轧成形模拟所采用的动力显式算法由于沙漏而造成单元畸变的问题，研究了沙漏控制方法，分析了矩形截面环件轧制的成形过程。环轧初始阶段，环件变形量小，沙漏能很小；随变形量增大，控制沙漏所需沙漏能持续增长。采用人工阻尼法需要的沙漏能可达内能的20%，而采用人工刚度法所需沙漏能明显减小，只占内能的5%左右，能减小沙漏能对内能的干扰。采用人工阻尼法计算沙漏能，阻尼系数可取0.05~0.15，取0.1时沙漏能最小；采用人工刚度法计算沙漏能，刚度系数k可取0.001~0.1，取0.05时沙漏能最小。

To handle the element distortion caused by hourglass in the dynamic explicit simulation of ring rolling, controlling methods in the FEA were studied. A rectangular section ring rolling was simulated. In the initial phase, the hourglass energy and the ring deformation were small. With the ring deformation increasing, much more hourglass energy was required. With the artificial damping method, the needed hourglass energy was about 20% of internal energy, while only 5% was needed with the artificial stiffness method. The internal energy was much less disturbed by the hourglass. with the artificial damping method, the damping factor was between 0.05 and 0.15, while the hourglass energy was the smallest when the 0.1 was adapted. With the artificial stiffness hourglass method, the stiffness factor was between 0.001 and 0.15, When stiffness factor was 0.05，the hourglass energy was the smallest.

基金项目：

河南科技大学博士科研启动基金资助项目；“高档数控机床与基础制造装备”科技重大专项资助项目(2009ZX04014-074-05)；华中科技大学材料成形与模具技术国家重点实验室开放基金资助项目(09-12)；河南科技大学校基金资助项目(2004ZY032)

参考文献：

[1]华林,黄兴高,朱春东.环件轧制理论和技术[M].北京: 机械工业出版社,2001.

[2]罗洲,华林,周勇强.环轧过程的显式有限元模拟分析[J].塑性工程学报,2004,11 (1): 68-70.

[3]Yang H, Guo L G, Zhan M,et al. Research on the influence of material properties on cold ring rolling processes by 3D-FE numerical simulation[J].J. Materials Processing Technology,2006,177(3): 634-638.

[4]华林,潘利波,兰箭，等.大型环件的径轴向轧制工艺模拟和研究[J].中国机械工程, 2006，17(19): 2020-2023.

[5]Flanagan D P，Belytschko T. A uniform strain hexahedron and quadrilateral with orthogonal hourglass control[J]. Int. J. Numer. Methods Engrg., 1981,(17): 679-706.

[6]Li K P , Cescotto S. An 8-node brick element with mixed formulation for large deformation analyes[J]. Computer Methods in Applied Mechanics and Engineering, 1997,141(12):157-204.

[7]Liu W K, Guo Yong,Tang Sing. et al. A multiple-quadrature eight-node hexahedral finite element for large deformation elasticplatic analysis[J]. Computer Methods in Applied Mechanics and Engineering, 1998,154(12):69-132.

服务与反馈：

【文章下载】【加入收藏】