The invention designs a
plasma cladding and
laser forging composite additive and subtractive manufacturing method and device, and belongs to the field of
metal material increasing and additive and subtractive manufacturing. The method is based on integration of three technologies of a
plasma beam cladding technology, a
laser impact forging technology and a
laser cutting technology, the three technologies are coupled with and affect each other, a formed area is subjected to laser
impact forging through short-pulse laser while
plasma beam cladding is conducted, internal residual tensile stress is removed, and the
cracking and deformation problems of the formed area are solved; the formed area is subjected to
laser milling after three or more
layers are formed, and based on the characteristics of non-contact
cutting force, slight heat influence and special
surface processing of
laser processing, the problems that the formed area has adhering
slag and is high in roughness are solved, meanwhile, through the method, a workpiece does not need to be moved frequently, and the problem of errors and deformation caused by
mechanical milling and clamping are solved. The method integrates the advantages that heat is concentrated of
plasma beam cladding, the heat influence is slight, the vacuum environment is not needed,
residual compressive stress in materials can be increased through laserimpact forging, inside pores and defects of parts are eliminated, grain structures are refined, no
cutting force exists during
laser cutting, and the heat influence is slight,
complementation is achieved, and the mechanical properties and surface quality of the parts obtained through additive manufacturing are improved.