Which is better, machined gear or powder metallurgy gear?

Which is better, machined gear or powder metallurgy gear?

Which is better, machined gear or powder metallurgy gear? Chognwei precision powder metallurgy gear processing manufacturers often hear this question. Today, Chognwei precision will analyze the advantages and disadvantages of powder metallurgy gears for you. After reading the following content, I believe you will know which is better to machine gears or powder metallurgy gears.

Before coming to the conclusion of which is better, let's take a look at the advantages and disadvantages of P/M gears. You may know which gear is more suitable for you. The specific analysis is as follows:

1、 Advantages of powder metallurgy gear:

1. Low cost, high production efficiency, one-time molding, no need to re process gear teeth after molding.

2. Due to the processing characteristics of powder metallurgy, it can be made into oil-bearing parts and oil-free parts, but the effect is still worse than that of oil bath lubrication, belonging to the boundary lubrication state.

3. There is no waste material in the gear forming process, which is the best use of steel resources.

Powder metallurgy gear

2、 Disadvantages of powder metallurgy gears:

1. As powder metallurgy is a recrystallization process that allows metal powder to form at high temperature, without rolling process and forming metal fiber flow, it is a non oriented mechanical property. Therefore, the bending and shear strength of gear teeth are not as good as those of traditional machined gears.

2. Because of 1, the contact strength of P/M gear teeth is also low, so it cannot transmit large torque.

3. Although gear teeth can be made of oil, the effective time limit of oil lubrication is relatively short. To ensure normal use, additional lubrication should be considered, and oil bath lubrication is the best.

4. The precision of powder metallurgy gears is relatively low, because there is no way to control the process of high-temperature sintering molding, just like burning bricks, the exact size of bricks fired from bricks is uncontrollable, so the transmission stability is poor.

5. Because of 4, the surface roughness of gear teeth is also relatively large, which will generate noise in transmission.

Now do you know which is better, machining gear or powder metallurgy gear? In fact, after reading the above contents, we can understand that powder metallurgy gears can be considered in some unimportant institutions, such as toys. However, if it is precision transmission, large torque transmission, etc., it is still necessary to select the machined gear. The precision of gears manufactured by powder metallurgy is not very high, generally about 10 wires, which is not suitable for precision transmission. I hope this article can help those in need.