Gear processing: what is an involute?

　　XNUMX. Discuss the gear quenching process and then discuss the residual stress of the surface layer after carburizing and quenching in the gear machining process.Regardless of carburizing quenching or non-carburizing normal overall quenching, the surface layer is in direct contact with the cooling medium to cool faster than the core, so the surface thermal stress direction is generally negative compressive stress, while the structure stress direction may increase after surface carburization The surface carbon content is reduced, and the martensite starting temperature is lowered, so that the martensite transformation occurs in the core before the surface, which affects the direction of surface stress.Second, the negative pressure stress of the gear The infiltration of carbon or nitrogen atoms in the material of the gear makes the surface of the part appear...