Ring rolling core roller structure and production process used for inner boss thereof

The invention relates to a ring rolling core roller structure and a production process used for an inner boss thereof. The whole core roller is of a three-segment type split structure and sequentiallycomprises an upper core mold sleeve, a protection ring and a lower core mold sleeve from top to bottom, the protection ring is embedded between the upper core mold sleeve and the lower core mold sleeve through supporting of a middle core bar, two ends of the core bar extend into the upper core mold sleeve and the lower core mold sleeve and are fixedly connected through a thread, the protection ring is in gap fit with the core bar, the protection ring is axially limited through the upper core mold sleeve and the lower core mold sleeve, the protection ring shrinks radially relative to the uppercore mold sleeve and the lower core mold sleeve, a core roller is of the groove structure on the protection ring, the length of the core bar screwed into the upper core mold sleeve and the lower coremold sleeve is adjusted, p