Non-axisymmetric spinning in the middle of a tube holds significant potential for practical applications, such as creating avoidance grooves for crossing pipelines. In this study, the forming mechanism of non-axisymmetric spinning in the middle of the tube was investigated by comparing two paths deduced using a profiling roller. The effects of roller paths on groove depth, wall thickness distribution, and shape accuracy were analyzed comparatively. The results show that the revised roller path increases the non-axisymmetric groove depth by 6.3%, reaching 7.4%. Consequently, the revised roller path reduces the range of the deformation zone, prevents excessive material flow, and minimizes springback. The method contributes to improved forming depth. Furthermore, the revised roller path enhances wall thickness uniformity. Additionally, revising the roller path positively impact forming accuracy. The study discusses and reveals the forming mechanisms behind the non-axisymmetric spinning.
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