基于流动速度场控制的弯曲管件双凸模挤压过程有限元模拟  

Finite element simulation of double ram extrusion(DRE) of bending tube based on the flow velocity field control

作　　者：宋继顺[1,2] 杜德恒[1] 崔宏祥[1,2,3] 马叙[1,2] 尹康[1] 

机构地区：[1]天津理工大学,天津300384 [2]天津市光电显示材料与器件重点实验室,天津300384 [3]显示材料与光电器件省部共建教育部重点实验室,天津300384

出　　处：《应用力学学报》2010年第2期392-396,共5页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(50975205);国家科技部科技重大专项(2009ZX04014-063-2);全国大学生创新性实验计划项目(DCSJ08-002)

摘　　要：采用材料流动速度场控制的方法,在DEFORM-3D有限元商业软件上实现了弯曲管件一次性挤压成形数值模拟。通过模拟,分析了双凸模挤压过程速度场分布、材料流动规律、挤压力、应力场和应变场的分布。采用双凸模结构实施差速挤压和速度控制,通过调节双凸模速度差值,改变弯曲管件的弯曲半径,给出了速度差与弯曲半径的关系曲线。该方法可以从根本上消除传统方法的壁厚不均等质量缺陷,对提高弯曲管件成形加工质量具有指导意义。In this paper a bending tube extrusion processing is simulated by DEFORM-3D commercial software based on the flow velocity field control technology.By numerical simulation of the double ram extrusion(DRE),the velocity field,the material flow pattern,the extrusion loads,and the stress strain distribution are analyzed.The material flow velocity is controlled by double ram structure of extrusion die.The bending radius extruded tube is changed with speed difference of double ram.The relation curve between the bending radius and the speed difference of the double ram is provided.The analysis results indicate that this innovative process can fundamentally avoid the quality defects caused by the traditional manufacturing method,such as non-uniform wall thickness and wrinkling.It is of practical significance for improving bending tube forming quality.

关 键 词：挤压 弯曲 流动控制 有限元模拟 

分 类 号：O353.1[理学—流体力学]