Ultra-large-specification metal ring piece preparation method based on radial sleeving assembly

The invention discloses a method for preparing an oversized metal ring piece based on a radial sleeving assembly, which relates to the technical field of metal processing, and comprises the following steps: step 1, preparing ring piece units: preparing a plurality of groups of ring piece units prepared by plastic processing and machining, with different groups of ring piece units having different inner diameters and outer diameters, the thickness of each ring piece unit is smaller than or equal to 200 mm, the heights of all the groups of ring piece units are equal, and all the groups of ring piece units are sequentially marked as 1, 2, 3,... M according to the sequence of the outer diameters from small to large; 2, heating each group of ring piece units according to the diameter from small to large, then carrying out interference sleeving, and then carrying out electron beam seal welding on the upper ends and the lower ends of the adjacent ring piece units to obtain ring piece preformed blanks; and thirdly, t