引线框架用C19210铜合金异形带连续挤压有限元模拟  

Finite element simulation of continuous extrusion of C19210 copper alloy special-shaped strip for lead frame

作　　者：李翰冬 张振峰 刘志林 焦传熔 姜雁斌 林高用[1,3] LI Han-dong;ZHANG Zhen-feng;LIU Zhi-lin;JIAO Chuan-rong;JIANG Yan-bin;LIN Gao-yong(School of Materials Science and Engineering,Central South University,Changsha 410083,China;Jiangsu Jiangshun Precision Mechanical and Electrical equipment Co.,Ltd.,Jiangyin 214424,China;The Key Laboratory of Nonferrous Metal Materials Science and Engineering,Ministry of Education,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]江苏江顺精密机电设备有限公司,江苏江阴214424 [3]中南大学有色金属材料科学与工程教育部重点实验室,湖南长沙410083

出　　处：《塑性工程学报》2023年第9期17-26,共10页Journal of Plasticity Engineering

基　　金：国家重点研发计划(2021YFB3501003);太原市关键核心技术攻关“揭榜挂帅”项目;芜湖市重大科技项目(2021zd02)。

摘　　要：采用热压缩实验建立了C19210铜合金的本构方程,并结合DEFORM-3D有限元模拟软件分析了C19210铜合金异形带连续挤压过程中金属的流动规律,通过等效应变、速度矢量和点追踪等方法揭示了连续挤压异形铜带缺陷的形成机理,发现轮槽内挤压过程中坯料的折叠现象是导致缺陷形成的重要原因,而模腔和模具的不对称分布加剧了挤出铜带下侧缺陷的形成。通过优化模具工作带尺寸,模腔内金属的等效应力和流动速度变得更加均匀,挤出后的异形带表面质量得到明显提高。The constitutive equation of C19210 copper alloy was established by hot compression experiment,and the metal flow laws of C19210 copper alloy special-shaped strip during continuous extrusion were analyzed by DEFORM-3D finite element simulation software,and the formation mechanisms of defects of special-shaped copper strip in continuous extrusion were revealed by means of equivalent strain,velocity vector and point tracking.It is found that the folding phenomenon of billet in the wheel groove is an important reason for the formation of defects,while the asymmetric distribution of die cavity and die aggravates the formation of defects on the lower side of the extruded copper strip.By optimizing the working belt size of the die,the equivalent stress and flow velocity of the metal in the die cavity become more uniform,and the surface quality of the extruded special-shaped strip is improved obviously.

关 键 词：C19210铜合金 连续挤压 有限元模拟 本构方程 表面缺陷 模具 

分 类 号：TG146.1[一般工业技术—材料科学与工程]