Powder metallurgy has a series of advantages, such as material saving, energy saving, high efficiency, it is more suitable for mass production, good size and shape repeatability, low noise and low wear when gears are running, etc., so it has been widely used. The main disadvantage is that it is not resistant to impact and has poor impact performance. Therefore, it is very important to improve the strength of powder metallurgy.
Strength characteristics of powder metallurgy gears
1. Taking the size of powder metallurgy blank processing, its strength will be about 10% higher.
2. The expansion coefficient of the material and the precision of the mold mostly depend on the precision of the powder metallurgy gear. Generally, the domestic molds for gears with a diameter of less than 50 are between grades 8 and 9, while the imported molds are between grades 7 and 8. If it is a helical gear, then it can be one level higher. The biggest advantage of powder metallurgy gears is that they can be produced in large batches with very good consistency.
3. For ordinary FN0205 powder metallurgy gears, it can carry a torque of 14NM, and the warm-pressed parts can reach 20NM, and if the warm-pressed FD0405 can reach about 25NM. Therefore, under the condition that the complete set of gears adopts the practice allowed by the professional powder metallurgy design, the lightness can still be increased to 30-40%.