The sintered gear with higher strength can be made of copper-permeated sintered steel with a density of 90 ~ 95% theoretical value, low connectivity porosity, and smooth operation. Sintered gears with higher oil content are required to enhance self-lubrication and wear resistance.

The performance of the sintered gear is closely related to the powder metallurgy process, and the performance of the gear produced by different processes and technical routes is very different, and the development of powder metallurgy technology promotes the improvement of the performance of the sintered gear and the stability of the size. The technologies developed in recent years such as warm forming, high-speed forming, sintering hardening, high-temperature sintering, melting, and gear surface densification are expected to achieve high density, low cost, and high precision gear production at the same time.

Sintered gears vs machined

As an important part of the transmission system, the gear is generally made by mechanical processing. However, with the development of the automobile industry, the requirements for gear and other parts are getting higher and higher, and it is difficult to meet the requirements in terms of cost, delivery date, and noise; Powder metallurgy is a technology that can manufacture complex shaped parts, which can save material, energy, labor, high quality, suitable for mass production, and can meet the requirements of the automotive industry for parts.

Through the use of high-performance powder forming, sintering, and special post-processing, the powder metallurgy process has been able to produce gears with densities exceeding 7.5g/cm3. The use of these technologies has successfully replaced parts machined or machined by other methods. The success of the powder metallurgy process has made it possible for mechanical engineers to design high-performance and lower-cost parts. At present, the gear parts used in automobiles are synchronizer gear hubs, clutch gear hubs, and so on.