偏心件旋压成形数值模拟网格自适应技术的研究  

A study of adaptive mesh technique in numerical simulation of offset tube neck-spinning

作　　者：冯万林[1] 夏琴香[1] 李小龙[1] 

机构地区：[1]华南理工大学机械工程学院,广东广州510640

出　　处：《轻金属》2007年第10期67-71,共5页Light Metals

基　　金：国家自然科学基金(50275054);广东省自然科学基金(020923);广东省工业科技攻关计划项目(2003C102013)资助

摘　　要：为提高旋压成形数值模拟的计算效率和精度,对偏心管件缩径旋压成形数值模拟网格自适应技术进行了研究。通过有限元数值模拟软件MARC建立了偏心件三旋轮缩径旋压成形的有限元模型;基于MARC软件的UADAPBOX接口,采用箱盒准则,利用二次开发所获得的子程序来控制箱盒区域的运动,实现了成形模拟过程中的网格加密以及加密网格完全可逆等关键技术;对比了采用与未采用自适应技术的等效应变、外层网格扭转、轴向伸长量以及计算效率的变化。结果表明:采用自适应完全可逆技术可以在保证计算精度的前提下,大大缩短了计算时间,提高计算效率近3倍。The adaptive mesh technique in numerical simulation of offset tube neck- spinning is studied to improve the computation efficiency and accuracy of the numerical simulation, A finite element model to simulate three- roller neck - spinning process is established by the finite element software, MARC; the key techniques during the simulation, such as mesh subdivision and complete reversibility of the subdivided mesh are developed by UADAPBOX interface and box criterion, where the movement of the box is controlled by the secondary developed subroutine. The equivalent strains, mesh torsions of the outer layer, axial elongations and computation efficiency using adaptive technique are compared with the ones not using adaptive technique. The results show that the computation time decreases greatly and the computation efficiency increases nearly 3 times on condition of the same computation accuracy when using adaptive mesh technique with complete reversibility.

关 键 词：缩径旋压 偏心件 数值模拟 网格自适应 箱盒准则 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]