Abstract
Abstract The eccentric force exerted on the mandrel by the rollers has important influence on the forming precision of tubular workpieces during tube spinning, which is closely related to the roller distribution mode. In this study, the deformation characteristics and spinning forces were investigated during tube spinning with different roller distribution modes. According to the simulation results, the contact zones under the rollers were analyzed and the spinning forces applied by various rollers were obtained. The results show that the stress distribution exhibits non-periodic change along circumferential direction and the spinning forces of various rollers are different because the non-uniform distribution of the rollers leads to different contact zone areas under the rollers. The variation of spinning forces of the rollers causes the unbalanced load exerted on the mandrel, thus the mandrel deviates from the neutral axis, which is verified by the deflection measurement of the mandrel end in the spinning experiment. Although the spinning forces of the rollers on the same side are different, four-roller spinning can keep the balance of the mandrel. In addition, stagger spinning with nonuniformly distributed three rollers is newly proposed to achieve the balance of the mandrel, increasing the flexibility of traditional two-roller spinning machine.
Published Version
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