二分模旋转模锻工艺是微小型轴向内沟槽铜管（AIGCT）的重要缩径工艺.本文通过实验探讨了两种不同截面尺寸类型（分别记作Ⅰ和Ⅱ）和三种不同的材料属性状态（分别记作：A、B和C）下沟槽管缩径缺陷和缩径进给速率的关系.实验结果表明,A状态Ⅰ型管的伸长率最高可达到20%以上,并随着进给速率的增加而减小;当进给速率超过21mm/s时,在A状态Ⅰ型管的成形区将会产生飞边;当进给速率超过13mm/s时,在A状态Ⅱ型管的成形区将产生凹陷.进给速率超过4mm/s和13mm/s时,将分别会在B状态Ⅰ型管和Ⅱ型管的未成形区产生扭曲.由于存在严重的扭曲和压溃,C状态内沟槽铜管不适合用二分模的方式进行缩径.
In this paper, the two-split dies rotary swaging experiments of axial inner micro-grooved copper tube (AIGCT) are carried out to study the relation of forming defects and feeding rate with two types of cross-sec- tions ( denoted asⅠ and Ⅱ ) and three material states ( denoted as A, B and C) of the tube. The result shows that, the maximum elongation ratio of the A-state AIGCT during rotary swaging may be more than 20%, and it decreases with the increase of feeding rate. It is found that wing can occur on the sizing zone of type I AIGCT in A-state at the feeding rate of more than 21mm/s,and sinking can occur on the sizing zone of type Ⅱ AIGCT in A-state at the feeding rate of more than 13mm/s. When the feeding rate is more than 4mm/s and 13ram/s, twisting will occur on the preform of type [ AIGCT in B-state and type Ⅱ AIGCT in B-state respectively. It is not advisable to form AIGCT in C-state through two-split dies rotary swaging process due to its obvious twisting and compression.
参考文献
| [1] | A. Ghaei;M.R. Movahhedy;A. Karimi Taheri .Study of the effects of die geometry on deformation in the radial forging process[J].Journal of Materials Processing Technology,2005(1/2):156-163. |
| [2] | 李勇,许泽川,汤勇,曾志新.薄壁轴向微沟槽铜管高速旋压成形的数值模拟[J].华南理工大学学报（自然科学版）,2010(01):128-133. |
| [3] | 夏琴香,陈家华,梁佰祥,张世俊,阮锋.基于数值模拟的无芯模旋压收口工艺[J].华南理工大学学报（自然科学版）,2006(02):1-7. |
| [4] | A. Ghaei;M.R. Movahhedy .Die design for the radial forging process using 3D FEM[J].Journal of Materials Processing Technology,2007(26):534-539. |
| [5] | A. Ghaei;M.R. Movahhedy;A. Karimi Taheri .Finite element modelling simulation of radial forging of tubes without mandrel[J].Materials & design,2008(4):867-872. |
| [6] | D. Y. Jang;J. H. Liou .Study of stress development in axi-symmetric products processed by radial forging using a 3-D non-linear finite-element method[J].Journal of Materials Processing Technology,1998(1/3):74-82. |
| [7] | A. Ameli;M. R. Movahhedy .A parametric study on residual stresses and forging load in cold radial forging process[J].The International Journal of Advanced Manufacturing Technology,2007(1/2):7-17. |
| [8] | M. Sanjari;A. Karimi Taheri;A. Ghaei .Prediction of neutral plane and effects of the process parameters in radial forging using an upper bound solution[J].Journal of Materials Processing Technology,2007(1/3):147-153. |
| [9] | Bernd Kuhfuss;Eric Moumi;Volker Piwek .Micro rotary swaging: process limitations and attempts to their extension[J].Microsystem technologies,2008(12):1995-2000. |
| [10] | Seong-Joo Lim;Ho-Joon Choi;Chi-Hwan Lee .Forming characteristics of tubular product through the rotary swaging process[J].Journal of Materials Processing Technology,2009(1):283-288. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%