The invention discloses a
hot working method of a high-performance small-
distortion carburized outer ring, relates to the technical field of
hot working methods, and solves the technical problems of complex manufacturing process, non-uniform carburized layer depth and
poor quality consistency of the existing outer ring, and is suitable for
forging and heat treatment of the outer ring made of 17Cr2Ni2MoVNb steel, the
diameter of the outer ring is 150-200 mm, and the wall thickness of the outer ring is 8-10 mm. The
hot working method comprises the following steps of constructing a true stress-strain curve and a hot working diagram,
forging, normalizing and
tempering at a high temperature, roughly
machining, thermal refining, roughly
machining a tooth shape and the like, performing gas / liquid composite
carburizing and
tempering at a high temperature,
quenching and
tempering at a low temperature. According to the hot working method, the
ovality of the carburized and quenched outer ring is controlled to be less than or equal to 0.15 mm, the grain size is greater than or equal to 8.5 grades, and the rotating
bending fatigue strength of a furnace sample is greater than or equal to 1000 MPa; and the part has high performance, meanwhile, only small heat treatment deformation exists, and good industrial application value is achieved.