摘要
针对管端成形过程中金属塑性流动引起的轴向伸缩及卸载回弹导致的成形精度问题,研究金属的塑性流动和回弹对管端成形的影响。以不锈钢卡压式直通管件为研究对象,运用LS-DYNA的有限元显式算法和隐式算法对薄壁管管端成形进行数值模拟,得到管材的金属流动分布和卸载后的回弹结果,并进行了实验验证。研究表明,管端扩孔和缩孔中,在变形急剧处,金属出现一定程度的累积,壁厚有较明显地增加。金属的流动对管端的径向尺寸影响可以忽略,但是对管端的轴向尺寸影响较大,需对坯料进行补偿;管端卸载后的回弹尺寸影响成形的精度,需通过模具进行补偿。对金属塑性流动和回弹进行有限元分析,能有效地指导管端成形的模具设计及优化加工工艺,极大缩短产品开发和模具设计周期。
In order to improve the dimensional accuracy of end formed thin-walled tubes,the influence plastic flow and springback of metal are discussed by using simulation and experimental method.Stainless steel press-fitting was taken for example to illustrate the process with explicit algorithms and implicit algorithms of LS-DYNA.Experimental investigation was performed.The results indicate that in the process as expansion and reduction,thickness of tube increase obviously at the place where geometry change severely.The plastic flow of metal shows little influence on the radial dimensions,but is influential on the axial dimension.The influence of springback to the dimensional accuracy could be compensated through mould designing.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2010年第4期66-70,共5页
Journal of Plasticity Engineering
关键词
管端成形
回弹
轴向伸缩
有限元法
薄壁管
end forming of tubes
springback
axial stretching
finite element method
thin-walled tube
