Which process is better, machining gears or powder metallurgy gears?

Advantages, powder metallurgy gears:

1, low cost, high production efficiency, a molding, molding is not required after tooth.

2, the processing properties of powder metallurgy, can be made into oily parts, forming a lubrication free parts,but the effect was less than oil bath lubrication, which belongs to the boundary lubrication.

3, gear shaping process without waste, is the best for the use of iron and steel resources

Two, the powder metallurgy gear faults:

1, because the powder metallurgy is the recrystallization process for metal powder forming at high temperature,not through the rolling process, the metal fiber flow has not been formed, is a kind of non oriented mechanical properties, therefore, the gear tooth bending, shear strength than traditional machining gear

2, because of 1 reasons, powder metallurgy gear tooth contact strength is lower, and therefore can not transfer large torque

3, although it can be made into oil state of the gear oil, but effective time is short, in order to ensure the normal use, or to consider additional lubrication, oil bath lubrication is the best.

4, powder metallurgy gears precision is relatively low, because there is no way to control in the process of high temperature sintering in, like brick, adobe bricks is what kind, the exact size is not controllable, therefore, stable transmission.

5, by 4 reasons, the tooth surface roughness is relatively large, will produce noise in the transmission process.

To sum up, in some not important institutions may consider using powder metallurgy gear, such as toys,transmission precision, high torque drive or preferred machining gear

Gear precision manufacture of powder metallurgy is not very high, generally in the 10 wire, not suitable forprecision transmission.