Auto Parts Of Gear With powder metallurgy （PM）

The advantages of powder metallurgy gear
1, low cost, high efficiency, a molding, do not need to rework tooth after forming.
2, due to the processing properties of powder metallurgy, oil-bearing parts can be made, the formation of free lubrication parts, but some are worse than oil bath lubrication, belong to the state of boundary lubrication.
3, the gear forming process without waste, for the steel is one of the best of resource utilization.

The powder metallurgy gear faults:
1, because of the powder metallurgy is to make the recrystallization process of metal powder forming at high temperature, without rolling process, no flow of metal fibre formation, mechanical properties is a kind of orientation, as a result, the tooth bending, shear strength than the traditional mechanical processing gear
2, or because of the reason of 1, powder metallurgy gear tooth contact strength is low, therefore cannot pass big torque
3, although you can make it oily status of tooth, but oil effective time is shorter, to ensure the normal use, or want to consider and lubrication, oil bath lubrication is the best.
4, powder metallurgy gear accuracy is lower, because in the process of high temperature sintering molding is no way to control, just want to brick, tile is what on earth is burnt brick, the accurate size is controllable, therefore, driving stability is poorer 5, by four reasons, tooth surface roughness is bigger, will produce noise in the transmission.

Above all, some products can consider to use powder metallurgy gear, such as toys,  but precision transmission, large torque, or preferred machining gears
Powder metallurgy manufacture gear accuracy is not high, generally at about 10 silk, not suitable for precision transmission