Forged Brass Gear

Forged Brass Gear is manufactured from copper zinc alloy, with tooth profiles formed by hot precision forging or cold precision forging, followed by minimal secondary machining. They are typically small and medium sized gears. Thanks to the high damping capacity of brass, strong vibrations can be effectively absorbed. In addition, the refined and dense microstructure resulting from precision forging provides excellent impact resistance and fatigue resistance. These gears are well suited for precision transmission systems, light to medium load applications, and environments with strict requirements for low noise, long service life and high corrosion resistance.

1. Continuous metal flow lines, higher strength and fatigue life than machined gears
This is also a key advantage of precision forging.
Machining cuts off the metal fibers, leading to stress concentration at the tooth roots and tooth surfaces, which reduces impact resistance and fatigue resistance.
In contrast, precision forging ensures continuous, complete and dense metal fibers. As a result, tooth root strength is increased by 20%–40%, and fatigue life is improved by 30%–60%.

2. High surface finish, low noise and excellent wear resistance
Brass itself has excellent self-lubricating properties. The tooth surface roughness Ra is ≤ 0.8–4.6 μm, close to the grinding level. Gear hobbing and shaving are not required, and the gears can be assembled directly.
Transmission noise is 3–8 dB lower than that of machined brass gears.
Wear volume is reduced by 30%–50%.

3. High precision with reduced post-processing
Many small-module gears can be assembled directly after precision forging, eliminating processes such as hobbing, shaving and grinding, and greatly shortening production time.
Dimensional consistency is good, with reduced variation between batches.

4. High material utilization and low overall cost
The material utilization rate of precision-forged gears can reach 85%–95%. Since brass is relatively expensive, material utilization directly affects the overall cost. Full machining generates a large amount of brass chips, so precision-forged brass gears are more cost-effective than fully machined ones in small and medium batches.

5. Corrosion resistance and good damping capacity
The excellent corrosion resistance of precision-forged brass makes it perform better than steel gears in atmospheric, weak acid-base and fresh water environments.
Its good damping capacity absorbs vibration. For applications with strict vibration requirements, precision-forged brass is an excellent choice.

1. Automotive internal gears: e.g., transmission gears, steering system pinions, oil pump gears, etc.
2. Office automation equipment & micro motors: gear sets for printers, copiers and scanners
3. Valve actuator gears, water meter gears and water pump gears
4. Home appliance gears: actuator gears for air conditioners, refrigerators and washing machines, as well as reduction gears for garden tools
5. Gears for marine applications
6. Gears for food machinery and medical equipment
7. Small transmission gears for aerospace applications

Although Forged Brass Gear achieves near-net-shape forming with minimal post-processing, additional processes are sometimes applied to further enhance performance. These include:
1. Stress relief annealing: To eliminate residual stresses from cold forming, prevent deformation in service, and improve dimensional stability.
2. Recrystallization annealing: To reduce hardness and improve ductility, used for parts requiring subsequent cold deformation or low hardness.
3. Age hardening: Low-temperature aging is applied to certain special brass alloys.
4. Surface treatments: Passivation, tin plating, nickel plating, silver plating, black oxide finishing, oxidation, oil coating, etc.
5. Not all of these processes are necessary. We can select relevant processes based on the actual application scenario to better meet the requirements of the equipment.
 

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