中文摘要：

为深入研究旋压收口成形机理，并为实际工艺过程提供依据，文中建立了单旋轮无芯模旋压收口成形的大变形弹塑性有限元模型，使用有限元分析软件MARC，对旋压收口成形过程进行三维弹塑性有限元模拟．对旋压成形过程的变形机理及应力应变分布的分析结果表明，变形金属在旋轮与毛坯的接触区受三向压应力作用；从已变形区到未变形区，轴向拉应变逐渐过渡为压应变，径向压应变则过渡为拉应变．随着压下量的增加，等效应力增加，径向应力最大值均出现在口部直身以及过渡圆角内壁，最薄区域（拉裂危险截面）出现在过渡圆角位置．有限元模拟结果与实际旋压变形规律吻合良好，为收口旋压成形工艺的制定提供了理论依据．

英文摘要：

In order to further investigate the neck-spinning mechanism and conduct practical manufacturing, the mandreless neck-spinning with a single roller is simulated based on the 3D elastic-plastic FEM （Finite Element Method） model by means of the FEM software MARC. The deformation mechanism and the distributions of stress and strain in the process of the mandreless neck-spinning are also analyzed. The results show that （ 1 ） the deformed metal in the contact zone between the roller and the blank is in a 3D compressive stress state; （2） the axial tensile strain is gradually transformed into the compressive strain from the deformed zone to the undeformed zone, while the radial compressive strain is transformed into the tensile one ; （3） with the increment of the reduction of blank radius, the equivalent stress increases, and the maximum radial stress appears at the opening and the inner wall of the transitional circular zone; and （4） the thinnest area, namely, the dangerous position at which crack may occur, appears at the transitional circular zone. The simulated results accord well with the actual spinning process, which lays a theoretical foundation for the establishment of neck-spinning technology.