Finishing mechanism of stably rotary ring workpiece by friction driven

High-Performance Ring Parts (HPRPs) are widely used in various critical industrial fields, which require good surface quality and dimensional accuracy. The fine finishing of HPRPs is crucial in modern manufacturing. For traditional finishing methods, it is necessary to process the inner and outer surfaces separately due to the clamping. This paper reports on the floating clamp used in barrel finishing to realize the rotation of the ring workpiece by friction driven and uniform finishing of the outer surface and inner surface simultaneously. This work focuses on the finishing mechanism of the ring workpiece, which was rotated stably by friction driven. The constraint rule for the stable rotation of the ring workpiece was clarified by theoretical, simulation, and experimental methods. Subsequently, the action mode and strength of media on the inner and outer surface were studied by contact pressure distribution. Results show that the action strength of media on the inner surface is more significant than that on the outer surface. The finishing experiment is performed on the GCr15 ring workpiece under the condition that the distribution circle diameter is 70 mm, the number of support bars is 6, the angular speed of vessel is 60 rpm, and the filling level is 70 %. The surface roughness, topography, and morphology of finished and unfinished workpiece were analyzed to understand the finishing mechanism. It was found that the cutting induced by sliding is the dominant finishing mechanism of the inner surface, while the micro-ploughing and plastic deformation induced by impact are the dominant finishing mechanism of the outer surface.