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Gear Material Selection

Apr 30, 2020

The steel commonly used for making gears is quenched steel, quenched steel, carburized quenched steel and nitriding steel.Cast steel has a slightly lower strength than forged steel and is often used in larger gears.The mechanical properties of gray cast iron are poor, which can be used in open gear transmission under light load.Ductile iron can partly replace steel to make gear;Plastic gear is used for light load and low noise requirements, and its matching gear is generally good thermal conductivity of steel gear.

In the future, gears are developing in the direction of heavy load, high speed, high precision and high efficiency, and strive for small size, light weight, long life and economic reliability.

The development of gear theory and manufacturing technology will further study the mechanism of gear tooth damage, which is the basis for establishing a reliable strength calculation method, and the theoretical basis for improving the bearing capacity of gear and prolonging the life of gear.To develop new tooth shapes represented by circular tooth profile;Research on new gear materials and new process of gear manufacturing;The elastic deformation, manufacturing and installation errors as well as the distribution of temperature field of the gear are studied, and the gear tooth profile is modified to improve the smooth operation of the gear, and the contact area of the gear tooth is increased when the gear is fully loaded, so as to improve the bearing capacity of the gear.

Friction, lubrication theory and lubrication technology is the basic work in gear research, the study of elastohydrodynamic lubrication theory, the promotion of the use of synthetic lubricating oil and the appropriate addition of extreme pressure additives in the oil, can not only improve the bearing capacity of the tooth surface, but also improve the transmission efficiency.