采用芯模可有效减小双脊矩形管绕弯成形过程中的截面畸变，并提高弯曲管件的成形精度。因此基于ABAQUS/Explicit有限元软件，建立了可靠的双脊矩形管绕弯成形三维有限元模型，研究获得了芯模对截面畸变的影响规律。结果表明：沿截面宽度、高度、外脊宽度和双脊高度的最大变形量均位于管坯的棱线上；沿弯曲方向，管坯宽度、高度和双脊高度的最大变形量均出现在60°附近截面上，外脊宽度的最大变形量出现在20°附近的截面上；随着芯头个数的增加、芯头和管坯间隙的减小及其摩擦因数的减小，管坯宽度、高度和外脊高度的最大变形量均减小，而外脊宽度的最大变形量略有增大或基本不变。
Mandrel can reduce the cross-section distortion in rotary draw bending process and improve the forming accuracy of double-ridge rectangular tube. A reliable three-dimensional FE model of double-ridge rectangular tube in rotary-draw bending is established under the ABAQUS/Explicit environment, and the effects of mandrel on cross-section deformation are obtained. The results show that the maximum deformation of width, height, outer ridge width and double-ridge height along the section is located on the edge of tube. And the maximum deformation of width, height and double-ridge height appears near the 60° bending section, while the maximum deformation of outer-ridge width appears near the 20° bending section along the bending direction. With the increase in number of cores and the decrease of the clearance and friction coefficient between mandrel and tube, the maximum deformation of width, height and double-ridge height decreases, while the maximum deformation of outer-ridge width slightly increases or has almost unchanged.
参考文献
| [1] | 王雨松 .双脊波导加工[J].电子工艺技术,1994,6:18-19. |
| [2] | YANG He,LI Heng,ZHANG Zhiyong,ZHAN Mei,LIU Jing,LI Guangjun.Advances and Trends on Tube Bending Forming Technologies[J].中国航空学报（英文版）,2012(01):1-12. |
| [3] | WELO T;PAULSEN F;BROBAK T J .The behaviour of thin-walled,aluminium alloy profiles in rotary draw bending:A comparison between numerical and experimental results[J].Journal of Materials Processing Technology,1994,45:173-180. |
| [4] | Zhao, GY;Liu, YL;Yang, H;Lu, CH;Gu, RJ .Three-dimensional finite-elements modeling and simulation of rotary-draw bending process for thin-walled rectangular tube[J].Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing,2009(1/2):257-261. |
| [5] | OKUDE Y;SAKAKI S;YOSHIHARA S .Improving working limit in draw bending process of aluminum square tubes in large bending radius[J].Advanced Technology of Plasitcity,2008,2008:564-569. |
| [6] | TFB Tube Bending Manual[EB/OL].http://www.toolsforbending.com,2012-12-20. |
| [7] | Rectangular and double-ridge waveguide assembly man-ufacturing[EB/OL].http://www.mi-crowaveeng.com,2012-12-20. |
| [8] | GU R J;YANG H;ZHAN M et al.Effect of mandrel on the cross section quality of thin-walled tube NC bending[J].Transactions of Nonferrous Metals Society of China,2005,15(06):266-271. |
| [9] | 卢彩红 .薄壁矩形管绕弯成形截面畸变的模拟研究[D].西安:西北工业大学,2008. |
| [10] | 齐海雁,刘郁丽,杨合.芯模参数对3A21矩形管绕弯截面变形的影响研究[J].材料科学与工艺,2012(06):97-102. |
| [11] | Noah Utsumi;Syuji Sakaki .Countermeasures against undesirable phenomena in the draw-bending process for extruded square tubes[J].Journal of Materials Processing Technology,2002(2):264-269. |
| [12] | 阮志刚.24JS-3500双脊波导管弯扭成型工艺[J].船舶工业技术经济信息,2000(07):41-43. |
| [13] | 王孜凌,陈保刚.低熔点合金在克服型材弯曲凹陷中的应用[J].南京工程学院学报（自然科学版）,2006(01):39-42. |
| [14] | 谷诤巍,吕萌萌,卢睿,徐勇,朱丽娟.铝型材弯曲成形截面畸变缺陷控制方法研究[J].汽车工艺与材料,2012(05):72-74. |
| [15] | 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. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%