Powder metallurgical gears are metal parts made of metal powder pressing and forming. They can be manufactured in large quantities. Even gears with special shapes can be easily completed, so they are popular in machinery, automobiles, aerospace and other fields. Mixing is the first manufacturing process of powder metallurgy gears, and it is also one of the key steps. Before pressing and forming powder metallurgical gears, the raw materials need to be mixed according to a certain proportion according to the performance requirements of the finished product, determine the chemical composition of the powder mixture, and then according to the composition configuration, in addition to iron powder and graphite powder, for To improve the hardness or density distribution of powder metallurgy gears, a little zinc stearate can be added. A small amount of sulfur can also be added during the production process to reduce friction, so that the density distribution of the pressed billet is more uniform. Sulfur can also produce iron sulfide during sintering, which is a very good solid lubricant that can improve the friction reduction performance of powder metallurgical gears. Adding a small amount of oil to the iron powder can also improve the mixing uniformity of iron powder and graphite powder.
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2025 06/13
