Thin-wall annular sheet metal part assembling device and method

The invention provides a thin-wall annular sheet metal part assembling device and method, and belongs to the technical field of aeronautical manufacturing assembly.The thin-wall annular sheet metal part assembling device comprises a mold, the mold is matched with a sheet metal part shrunk in a low-temperature environment, and a plurality of positioning bolts sliding in the radial direction are arranged on the mold; different positioning bolts can be inserted into different metal plate holes at the same time; the part is placed on the base; the clamp assembly is fixed to the base and distributed on the periphery of the part, and the clamp assembly is used for stabilizing the position of the part on the base; a guide shaft is arranged on the base, a first guide plane is arranged on the guide shaft, a mandrel inner hole is formed in the die, the inner wall of the mandrel inner hole abuts against the side wall of the guide shaft, and a second guide plane attached to the first guide plane is arranged on the mandre