High Strength Gear PM Sintered Part
Gears, which are important parts of the transmission system, are generally made by machining. However, with the development of industry, the requirements for gears and other parts are getting higher and higher, and it is difficult to machine gears in terms of cost, delivery date and noise; while powder metallurgy is a technology that can manufacture parts with complex shapes. It can save material, save energy, save labor, and be of high quality. It is suitable for mass production and can meet the requirements of various industries for parts and gears. Therefore, the powder metallurgy industry is closely related to the gear industry.
Product advantages
|
Smoothness |
Dimensional accuracy |
Product density |
Appearance treatment |
Appropriate weight |
|
Roughness 1～5μm |
（±0.1%～±0.5%） |
92～95% |
According to customer requirements |
0.03g～400g） |
Production Process
1. The process of high-strength powder metallurgy gear products:
1. For high-strength powder metallurgy gear products, it should have a higher density and adopt the process of "pressing-pre-burning-reburning-heat treatment".
2. Adding 2%-3% nickel and 2% copper to the material can significantly improve the toughness and impact strength of the material after sintering.
3. The low carbon content can ensure that the product has high surface hardness and wear resistance during heat treatment, and the low carbon in the core will make the product have good impact resistance.
4. Compared with carburizing and quenching, carbonitriding products have good wear resistance, and the lower carbonitriding temperature ensures the strength of the core of the part and reduces the quenching deformation of the part.
2. Features of high-strength powder metallurgy gear products:
1. If the size of the powder metallurgy billet is used, its strength will be about 10% higher.
2. For ordinary FN0205 powder metallurgy gears, it can carry a torque up to 14NM, and the temperature-pressed parts can reach 20NM. If the temperature-pressed FD0405 can reach about 25NM. Therefore, in the case of a full set of gears designed by professional powder metallurgy, the lightness can still be increased to 30-40%.
3. The expansion coefficient of the material and the precision of the mold mainly depend on the precision of the powder metallurgy gear. For gears with a diameter less than 50, the domestic molds are generally 8-9 grades, and the imported molds are 7-8 grades. If it is a helical gear, it can be one level higher. The biggest advantage of powder metallurgy gears is that they can be mass-produced with very good consistency.
As a powder metallurgy part commonly used in automobile engines, powder metallurgy gears can fully meet the gear precision requirements through one-time forming and finishing processes, effectively improve processing efficiency, and do not require other post-processing.
Application of powder metallurgy in high-strength gear sintered parts
Gears, which are important parts of the transmission system, are generally made by machining. However, with the development of industry, the requirements for gears and other parts are getting higher and higher, and it is difficult to machine gears in terms of cost, delivery date and noise; while powder metallurgy is a technology that can manufacture parts with complex shapes. It can save material, save energy, save labor, and be of high quality. It is suitable for mass production and can meet the requirements of various industries for parts and gears. Therefore, the powder metallurgy industry is closely related to the gear industry.
We can apply powder metallurgy technology to process gears with more complex structures, and we should pay more attention during processing. In this case, it is necessary to properly select materials according to the different performance requirements of the workpiece, so as to ensure that the processed gears can obtain higher strength. .
When we use powder metallurgy blanks for gear processing, we can increase its strength by about 10%. In addition, the precision of gear production by powder metallurgy is related to the expansion coefficient of material processing and the precision of the mold. Therefore, the domestic mold for gears with a diameter within 50 is about eight levels, and the imported mold is slightly better than seven levels. In this case, if it is a helical gear, the grade will be higher. The biggest advantage of using powder metallurgy to make gears is that it can be produced in large quantities and has good uniformity.
Ordinary powder metallurgy gear products can generally withstand a torque equivalent to 14NM, and it can reach 20NM for warm-pressed parts. When designing, if the complete set of gears adopts professional powder metallurgy design, its quality can be reduced by about 30% if the shape modification is allowed.
The performance of sintered gears is closely related to the powder metallurgy process. The performance of gears produced by different processes and technical routes varies greatly, and the development of powder metallurgy technology has promoted the improvement of the performance of sintered gears and the stability of their dimensions.
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