倾斜类管件单道次缩径旋压的数值模拟  

Numerical Simulation of One-Path Neck-Spinning of Oblique Tubes

作　　者：夏琴香[1] 梁佰祥[1] 程秀全[2] 阮锋[1] 

机构地区：[1]华南理工大学机械工程学院,广东广州510640 [2]广州民航职业技术学院,广东广州510403

出　　处：《华南理工大学学报（自然科学版）》2006年第5期115-121,共7页Journal of South China University of Technology(Natural Science Edition)

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

摘　　要：为了研究非轴对称旋压的成形机理,并为以后的参数优化及工艺设计提供依据,采用有限元分析MSC.MARC软件,基于三维弹塑性有限元理论建立有限元模型,对倾斜类管件的旋压成形过程进行了数值模拟.分析得出了单道次旋压成形时的金属流动特点及应力、应变分布规律,并预测了成形过程中可能出现的缺陷及其区域.模拟和工艺试验结果表明:倾斜使得旋压件的变形网格、应力场、应变场、壁厚分布都呈非轴对称分布,旋压件的三向主应力、应变在圆周方向大致呈正弦或余弦分布;成形时毛坯向0°域倾斜,该区域的起旋点附近具有较严重的壁厚减薄现象,是倾斜类管件旋压成形时较容易发生破裂缺陷的区域.In order to investigate the mechanism of non-axisymmetric spinning and provide accordance for the corresponding parameter optimization and process design, a finite-element analytical （FEA） model is established based on the 3D elastic-plastic theory to numerically simulate the neck-spinning process of oblique tubes by the FEA MSC. MARC software. The characteristics of metal flow and the distributions of the stress and the strain in the onepath spinning are then obtained, and the potential defects and defect areas in the spinning are forecasted. Both the simulative and the experimental results show that the distributions of the deformed mesh, the stress, the strain and the thickness of the workpiece are all asymmetric due to the oblique spinning, that the distributions of the principal stresses and strains in the circumferential direction are sinusoidal or cosinoidal functions, and that, in the spinning, severe thinning occurs near the initial spinning area due to the leaning of workpiece towards the zero region, that is, the dangerous region where breaking may occur.

关 键 词：倾斜类管件 缩径旋压 应力 应变 数值模拟 MSC.MARC软件 

分 类 号：TG306[金属学及工艺—金属压力加工]