Method for improving compactness of metal-based composite material

The invention relates to a method for improving the compactness of a metal-based composite material, which is characterized by sequentially comprising the following steps of: 1) preparing a cylinder from a powder-formed metal-based composite material with the length of L1 and the diameter of d1; the shell comprises a pipe body and plugs arranged at the two ends of the pipe body respectively, the pipe body and the plugs jointly define an inner cavity, the length of the pipe body is L2, the inner diameter of the pipe body is d2, and the wall thickness of the pipe body is t; (3) embedding the metal-based composite material obtained in the step (1) into the inner cavity of the shell in the step (2) to form an assembly; (4) pre-rotary swaging is conducted on the assembly obtained in the step (3), and the diameter of the assembly is reduced by 0-2.1 mm; and (5) the assembly obtained in the step (4) is subjected to rotary swaging, so that the diameter of the assembly is reduced by 10-60%, the compactness of the meta