检索结果-南通市图书馆

Radially loading rotary extrusion for manufacturing large-size conical cylinders with inner transverse high ribs

Chinese Journal of Aeronautics 2023年第5期36卷 582-594页

作者： Zhe CHEN Zhimin ZHANG Jie ZHENG Yong XUE School of Material Science and Engineering North University of ChinaTaiyuan 030051China

The Large-size conical cylinders with Inner Transverse High Ribs(LCCWITHR) can reduce the weight of the parts while maintaining high rigidity and strength. Radially Loading Rotary Extrusion(RLRE) forming technology can achieve integral forming of LCCWITHR through the synergy of radial and rotary movements of dies. The flow law of the material during the forming process is the key to forming large-size inner ribs. At present, there is no unified understanding of the metal flow law of RLRE forming technology. An analytical expression was derived to predict the Radial Direction(RD) deformation loads. The FE simulation and process experiment were carried out to investigate the effects of the inclination angle, thickness factor and transition arc radius of the split top dies on the spacing of the metal diversion plane, the metal flow velocity of the rib area and the final radius of the inner rib. The influence of the split top dies loading distance and the bottom die rotation angle of each pass on the inner radius of the inner rib was verified. And the optimal combination of dies shape parameters and loading paths which can make the metal flow orderly was obtained: the inclination angle is 140°, the thickness factor is 3.64, the transition arc radius is 16 mm;the top dies loading distance is 15 mm, the bottom die rotation angle is 45°.The FE simulation results have been found to be in close agreement with physics experiment.The research results reveal the metal flow law of rib growth in the RLRE of LCCWITHR, which lays a theoretical foundation for subsequent thorough research and process optimization.

关键词： Extrusion molding Rotary extrusion Radially loading Inner transverse rib Metal flow law conical cylinder

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

TRANSITION TO TAYLOR VORTEX FLOW BETWEEN ROTATING conical cylinderS

引用

Journal of Hydrodynamics 2010年第2期22卷 241-245页

作者： LI Qiu-shu WEN Pu XU Lan-xi Department of Mathematics Beijing University of Chemical Technology 100029 Beijing China

Transition to Taylor vortex flow between two conical cylinders,with the inner one rotating and the outer one stationary,is studied by the numerical method in this article.It is found that the basic flow becomes unstable with increasing of Reynolds number（Re ） above a certain critical value Rec =117 and with the further increase of Re to about Re=300,the first stable vortex is formed near the top of the flow system.The annulus is filled with six pairs of vortices at about Re=800.These are confirmed by experimental observations.Moreover,the local extreme values of pressure and velocity are reached at the adjacent lines between neighboring vortices or at the medium lines of large vortices.The local minimum values of velocity and the local maximum values of pressure are reached at the same point,whereas the local maximum values of velocity of the flow are assumed at the point of inflection for pressure.

关键词： conical cylinder Reynolds number Taylor vortex

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：