网站首页期刊简介编委会过刊目录投稿指南广告合作征订与发行联系我们English
铝合金管材侧壁增厚成形极限与失稳研究
英文标题:Study on thickening limit and instability for aluminum alloy tube sidewall
作者:林启权 黄思龙 董文正 李彦涛 
单位:湘潭大学 机械工程学院 
关键词:6063-O铝合金管材 增厚成形极限 内增厚 管材失稳 应力分布 
分类号:TG376.9
出版年,卷(期):页码:2021,46(9):169-176
摘要:

 薄壁管材在增厚变形时容易向外鼓凸并导致折叠缺陷,因此,起皱失稳是主要的成形缺陷。提出了侧壁内、外增厚成形工艺,分别对管材的内(外)表面进行模具限制,使管材侧壁向外(内)增厚成形。通过有限元数值模拟与实验相结合的方法,对两者的成形稳定性进行对比分析,探究侧壁增厚时产生失稳现象的原因,并研究在两种增厚成形方法下,管材的侧壁增厚规律及成形极限。结果表明:与外增厚及传统镦粗成形工艺相比,侧壁内增厚时成形稳定性明显提高。通过对增厚过程进行追踪,可以发现,侧壁的失稳现象与侧壁的增厚方向以及轴向应力分布有关。通过有限元数值模拟及理论分析,得到了侧壁内增厚成形的无失稳条件,内增厚成形的增厚极限受高度的影响小,受高径比的影响大。

 Thin-walled tubes is prone to bulge outward and fold when they are thickened,so the wrinkling and instability are the main forming defects. Therefore, the internal and external thickening processes of sidewall was presented, the inner (outer) surface of tube was restricted by the die so that the sidewall was thickened outward (inward). Through a combination method of finite element numerical simulation and experiment, the forming stabilities of the two processes were compared and analyzed to explore the reasons of instability phenomenon when the sidewall was thickened, and the laws of the sidewall thickening and the forming limit for the two kinds of thickening forming processes were studied. The results show that the forming stability is greatly improved when the sidewall is thickened inward compared with the external thickening and the traditional upsetting process. And by tracing the thickening process, it is found that the instability phenomenon of sidewall is related to the thickening direction and the axial stress distribution of sidewall. Furthermore, through finite element numerical simulation and theoretical analysis, the condition without instability for the internal thickening of sidewall is obtained, and the thickening limit of the internal thickening is less affected by the height, but is greatly affected by the height-to-diameter ratio.

基金项目:
国家自然科学基金资助项目(51605408, 51575467);湖南省自然科学基金资助项目(2019JJ50604, 2020JJ4578)
作者简介:
林启权(1964-),男,博士,教授 E-mail:xtulqq@163.com 通信作者:董文正(1986-),男,博士,副教授 E-mail:wzdong@xtu.edu.cn
参考文献:

 [1]王志剛. 板鍛造の技術要点[J]. 精密工学会誌,201480(12)1049-1052.


 


Wang Z G. Keypoints of plate forging[J]. Journal of the Japan Society for Precision Engineering, 2014, 80(12): 1049-1052.


 


[2]杨勇,徐超,曹乃强,等. 空心管锻件精密辊锻成形工艺数值模拟[J]. 锻压技术,202045(8)88-93.


 


Yang Y, Xu C, Cao N Q, et al. Numerical simulation of precision roll forging process for hollow tube forgings[J]. Forging & Stamping Technology, 2020, 45(8): 88-93.


 


[3]Zhu Y, Zhu S F, Zhuang X Z, et al. Die structure optimization for eliminating premature folding of sid-ewall upsetting with a controllable deformation zone[J]. The International Journal of Advanced Manufacturing Technology, 2019, 105(1-4): 1411-1424.


 


[4]Zhu S F, Zhuang X Z, Zhu Y, et al. Thickening of cup sidewall through sheet-bulk forming with controllable deformation zone[J]. Journal of Materials Processing Technology, 2018, 262: 597-604.


 


[5]Zhu S F, Zhuang X Z, Xu D K, et al. Flange forming at an arbitrary tube location through upsetting with a controllable deformation zone[J]. Journal of Materials Processing Technology, 2019, 273: 116230.


 


[6]Hsu C C, Wu W L, Su H Z, et al. Sheet-bulk metal forming of copper heat spreader with controllable deformation zone[J]. Journal of Materials Research and Technology, 2021, 12: 316-332.


 


[7]Schneider T, Merklein M. Manufacturing of geared sheet metal components by a single-stage sheet-bulk metal forming process[J]. Key Engineering Materials, 2013554-557, 1478-1483.


 


[8]Alves L M, Gameiro J, Silva C M A, et al. Sheet-bulk forming of tubes for joining applications[J]. Journal of Materials Processing Technology, 2017, 240: 154-161.


 


[9]Alves L M, Afonso R M, Silva C M A, et al. Boss forming of annular flanges in thin-walled tubes[J].  Journal of Materials Processing Technology, 2017, 250: 182-189.


 


[10]Wang Z G, Hirasawa K, Yoshikawa Y, et al. Forming of light-weight gear wheel by plate forging[J]. CIRP Annals-Manufacturing Technology, 2017, 65(1): 293-296.


 


[11]Wang X Y, Guo M L, Luo J C, et al. Stamping-forging hybrid forming of double layer cup with different wall thicknesses[J]. Materials Research Innovations, 2011, 15 (1): 435-438.


 


[12]王新云,夏巨谌,陈志明,等. 板冲锻成形新工艺及其在轿车飞轮盘加工中的应用[J]. 塑性工程学报,200815(4)180-184.


 


Wang X Y, Xia J C, Chen Z M, et al. Application of a new sheet stampting-forging hybrid technology in the forming of flying wheel panel of car[J]. Journal of Plasticity Engineering, 2008, 15(4):180-184.


 


[13]冯文杰,刘吉,陈莹莹,等. 内斜齿轮冷挤压成形工艺方案[J]. 锻压技术,201944(4)95-100.


 


Feng W J, Liu J, Chen Y Y, et al. Cold extrusion forming process of internal helical gear[J]. Forging & Stamping Technology, 2019, 44(4): 95-100.


 


[14]Schuler GmbH. Metal Forming Handbook[M]. Berlin Heidelberg: Springer, 1998.

服务与反馈:
文章下载】【加入收藏
《锻压技术》编辑部版权所有

中国机械工业联合会主管  中国机械总院集团北京机电研究所有限公司 中国机械工程学会主办
联系地址:北京市海淀区学清路18号 邮编:100083
电话:+86-010-82415085 传真:+86-010-62920652
E-mail: fst@263.net(稿件) dyjsjournal@163.com(广告)
京ICP备07007000号-9