Kinematic analysis of workpiece rotation effects on pipe neck formation via frictionbased spinning

This paper examines the influence of the workpiece rotation direction on the efficiency of the rotary spinning process. It is demonstrated that this parameter plays a significant role when the friction tool has active calibration, while its effect will be minimal when using flat rotary profiling. In cases of active calibration and counterrotation shortens the neck length, whereas co-rotation enhances neck elongation due to a more favourable stress distribution pattern.