The purpose of gear heat treatment is to improve the mechanical properties of the gear, improve its hardness, strength and wear resistance, in order to increase the service life and reliability of the gear. It mainly has the following purposes: Improve hardness: Through heat treatment, the surface hardness of the gear can be improved, thereby enhancing its anti-wear, anti-corrosion and anti-deformation ability. Improve strength: Heat treatment can improve the organization and structure of the gear, eliminate internal stress, improve the strength and toughness of the gear, so that it can withstand greater loads. Improve wear resistance: Through heat treatment, a dense nitride or carbide layer can be formed on the gear surface to improve the wear resistance of the gear and extend its service life. Commonly used gear heat treatment methods include: carburizing quenching: the gear is placed in the quenching medium containing carbon source for heating, so that carbon elements penetrate the surface of the gear, forming a high carbonization layer, and then through quenching to cool it quickly, thereby improving the hardness and strength of the gear. Quenching and tempering: First heat the gear to the quenching temperature, quickly cool the surface to form martensitic tissue, and then tempering treatment, by regulating the tempering temperature and time, so that the gear to achieve the required hardness, strength and toughness. Tempering: the gear is heated to the appropriate temperature for a period of time, and then quickly cooled by air cooling or oil cooling, so that it can obtain higher hardness and strength, but compared with quenching, the tempering metamorphism range is smaller, and the deformation and brittleness of the gear is lower. Nitriding treatment: the gear is heated in a medium containing nitrogen sources, so that nitrogen elements penetrate into the surface of the gear to form a nitride layer, thereby improving the hardness, wear resistance and corrosion resistance of the gear. The above are commonly used gear heat treatment methods, the choice of specific methods depends on the material, size and working environment of the gear and other factors.
