Abstract: By introducing a double-spinning rollers and its semi-enclosed structure of shovel spinning, a 3D rigid-plastic finite element method model of the spinning process of the inner cylinder on double cylindrical parts with flange was established on the platform of Simufact, and was used to validate the forming effect. The material in the major deformation zone has the displacement toward the axial, radial and tangential directions due to the compressive stress with nonuniform distribution during shovel spinning processing, therefore the inner cylinder exhibits an increasing effect in the axial length and the radial thickness. At the later stage of forming, the metal at the bottom is easier to be subjected to the compressive stress from the metal in the small deformation zone, which results in the difficulty of radial thickness and the lack of material on the inside of the barrel wall appeared. The greater the feed distance is, the more obvious the thickening effect and the lack of material are. The spinning process was tested on the spinning machine of CDC-60, and the results show that the effective height and the effective thickness can reach to 35.0mm and 6.9mm, respectively, which are over 15 times and 3 times of the thickness of shovel spinning, the errors of simulated and test results were less than 10%. The feasibility of numerical simulation analysis and semi-closed spinning roller structure is verified.

Key words: shovel spinning; semi-closed spinning roller; thickening effect; lack of material