This project carries out the application, examination and verification research of "matrix strengthening and toughening, ultra-fine heat treatment technology" on high carbon chromium bearing steel used for precision machine tool bearings, and adopts the composite heat treatment technology combining controlled forging and controlled cooling technology and heat treatment to control the quantity, size and shape of carbides and the size of austenite grains, so as to realize the double refinement of austenite grains and carbides, Different heat treatment processes of GCr15 steel after controlled forging and cooling are studied to make the bearing parts reach the expected and controllable performance requirements, so as to obtain high strength, high toughness and high performance precision bearing parts. Through the research of micro-deformation heat treatment process, a complete set of heat processing technology is developed, and the carbide network is refined through strict control of carbide quality; Control the compactness of the hot working and forging streamline of the bearing, so that the material of the bearing ring has high compactness; The grain size of bearing parts shall be controlled, and the carbide particles shall be fine and uniform; The application and implementation of micro-deformation heat treatment technology can effectively control the size change rate of heat treatment with diameter ≥ 120mm ≤ 0.15%. Through project research, the dimensional accuracy and service life of precision machine tool bearings have been significantly improved, and mature technical specifications for matrix toughening heat treatment of high-precision long-life precision machine tool bearings have been formed. The application demonstration project and application demonstration base of "matrix toughening heat treatment control technology" for precision machine tool bearings have been established to meet the needs of precision bearings in high-end machine tools and other industries in China.
