Material selection of machine tool gear parts

Machine tool gears are divided into three categories according to working conditions: (1) Light-load gears. The rotation speed is generally not high, mostly made of 45 steel, normalized or quenched and tempered. (2) Medium load gear. Generally made of 45 steel, after normalizing or quenching and tempering, high-frequency surface hardening is carried out to improve the bearing capacity and wear resistance of the gear. For large-size gears, alloy quenched and tempered steel such as 40Cr is required. Most of the gears in the transmission system and feed system of general machine tools belong to this category. (3) Heavy-duty gear. For some gears with large working load, especially gears with high running speed and high impact load, most of them are made of 20Cr, 20CrMnTi and other carburized steel. Use after carburizing and quenching treatments. For example: some important transmission gears in the gearbox.