为了控制矩形管绕弯成形的回弹和截面变形，建立考虑压块力、速度加载条件的回弹和截面变形有限元预测模型，并对其可靠性进行实验验证。基于所建模型研究压块的摩擦因数、夹持压力和助推速度对H96矩形管回弹与截面变形的影响规律。结果表明：摩擦因数和夹持压力越大，回弹角和横截面高度变形越小。但压块对横、纵截面畸变的作用完全相反；芯头支撑区域内助推速度的变化能够影响回弹量，且不会加剧截面变形。提出变助推速度的压块边界条件组合方案，实现了弯曲角度小于90°和大于等于90°弯管的回弹量分别降低55.31%和36.45%，60°弯管的高度变形量平均降低1.79%，90°和120°弯管的高度变形量最大分别降低5.98%和6.35%。
In order to control springback and section deformation of rotary-draw bending of rectangular tube, the finite element model for springback and sectional deformation prediction, which considers the loading and velocity conditions of pressure die, was established and verified by experiment. Based on the model, the impact of friction coefficient, pressure and boosting velocity of pressure die on springback and section deformation of H96 rectangular tube was investigated. The results show that the larger the friction coefficient and the clamping pressure are, the smaller the springback angle and the cross-section height deformation are. However, the impacts of pressure die on deformations of cross-section and longitudinal-section are completely opposite. The change of boosting velocity within core-filled area can influence the springback amount, while not exacerbate section deformation at the same time. Then, the combinations of pressure die boundary conditions of variable boosting speed were proposed. And by which, it is realized that springback angles are decreased by 55.31%and 36.45%, respectively, for bent tubes smaller than 90° or no less than 90°. The cross-section height deformations are reduced by 1.79%for 60° tube on average, and 5.98%and 6.35%, respectively, for 90° tube and 120° tube at most.
参考文献
| [1] | 刘伟,刘红生,邢忠文,曹克利.高强钢板冲压成形的回弹规律与工艺参数研究[J].材料科学与工艺,2010(06):758-761. |
| [2] | 张尧武,曾卫东,戴毅,赵永庆,周义刚,王凯旋.基于虚拟正交试验的热推弯管工艺参数优化设计[J].塑性工程学报,2009(06):91-95. |
| [3] | H. Li;H. Yang;M. Zhan;Y. L. Kou .Deformation behaviors of thin-walled tube in rotary draw bending under push assistant loading conditions[J].Journal of Materials Processing Technology,2010(1):143-158. |
| [4] | LI Cheng,YANG He,ZHAN Mei,XU Xu-dong,LI Guang-jun.Effects of process parameters on numerical control bending process for large diameter thin-walled aluminum alloy tubes[J].中国有色金属学报（英文版）,2009(03):668-673. |
| [5] | ZHAO Gang-yao,LIU Yu-li,YANG He,LU Cai-hong.Cross-sectional distortion behaviors of thin-walled rectangular tube in rotary-draw bending process[J].中国有色金属学报（英文版）,2010(03):484-489. |
| [6] | 李雁鹏,吴建军.非平面弯管成形过程的回弹补偿研究[J].锻压技术,2009(01):89-92. |
| [7] | 张深,吴建军.管材空间绕弯回弹补偿方法研究[J].西北工业大学学报,2011(05):811-817. |
| [8] | Liu, W;Yang, YY;Xing, ZW;Zhao, LH .Springback control of sheet metal forming based on the response-surface method and multi-objective genetic algorithm[J].Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing,2009(1/2):325-328. |
| [9] | Tsutao Katayama;Eiji Nakamachi;Yasunori Nakamura;Tomiso Ohata;Yusuke Morishita;Hbiroki Murase .Development of process design system for press forming - multi-objective optimization of intermediate die shape in transfer forming[J].Journal of Materials Processing Technology,2004(0):1564-1570. |
| [10] | CLAUSEN A H;HOPPERSTAD O S;LANGSETH M .Sensitivity of model parameters in stretch bending of aluminium extrusions[J].International Journal of Mechanical Sciences,2001,43:427-453. |
| [11] | J. E. Miller;S. Kyriakides;A. H. Bastard .On bend-stretch forming of aluminum extruded tubes - I: experiments[J].International Journal of Mechanical Sciences,2001(5):1283-1317. |
| [12] | Edmundo Corona .A simple analysis for bend-stretch forming of aluminum extrusions[J].International Journal of Mechanical Sciences,2004(3):433-448. |
| [13] | Hong Zhu;Kim A. Stelson .Modeling and Closed-Loop Control of Stretch Bending of Aluminum Rectangular Tubes[J].Journal of manufacturing science and engineering,2003(1):113-119. |
| [14] | 朱英霞,刘郁丽,杨合.H96黄铜薄壁矩形管绕弯回弹和截面畸变对工艺参数的敏感性[J].中国有色金属学报（英文版）,2012(09):2233-2240. |
| [15] | 赵刚要 .薄壁矩形管数控绕弯成形起皱及成形极限研究[D].西安:西北工业大学,2010. |
| [16] | 徐灏.机械设计手册[M].北京:机械工业出版社,1991 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%