Rolling apparatus for annular workpiece

A rolling apparatus for an annular workpiece, wherein the rolling apparatus is configured to perform a rolling operation on an inner side of the annular workpiece and the rolling apparatus comprises:

• a roller, comprising two circular frames butt-jointed with each other, a removable bottom mount, a removable bottom stem, and a removable central sleeve configured to be butt-jointed with the removable bottom stem, the removable bottom mount being configured to receive the two circular frames and centrally formed with a hole, the removable bottom stem being placed over the hole of the removable bottom mount and located at a center of the butt-jointed two circular frames, the removable bottom stem being atop provided with a cylindrical head with a reduced diameter as compared to the removable bottom stem, the cylindrical head being configured to receive the annular workpiece, the removable central sleeve having an inner hole that is configured to receive the cylindrical head of the removable bottom stem, the two circular frames being filled with an investment material, wherein when the removable bottom mount, the removable bottom stem, and the removable central sleeve are removed, a through hole is formed at a center of the investment material, with an outer circumferential surface of the annular workpiece tightly wrapped by the investment material and an inner circumferential surface of the annular workpiece exposed at the through hole;
• a rolling wheel device, comprising a cylindrical rolling wheel and being configured to perform the rolling operation on the inner circumferential surface of the annular workpiece in the roller;
• and
• a base, comprising a rolling platform, wherein in the rolling operation, the roller rolls on the rolling platform.