How to Produce Powder Metallurgical Parts

Powder metallurgy is a process technology that produces metal or uses metal powder (or a mixture of metal powder and non-metallic powder) as raw material, undergoes forming and sintering, and manufactures metal materials, composite materials, and various types of products. The broad powder metallurgy product industry includes iron and stone cutting tools, hard alloys, magnetic materials, and powder metallurgy products. The narrow definition of powder metallurgy products industry only refers to powder metallurgy products, including powder metallurgy parts (accounting for the majority), oil bearing, and metal injection molding products.

Taking powder metallurgy parts gears as an example, the production process is briefly described below.

The production process of powder metallurgy gears: mold design and determination of raw materials - mold manufacturing - mixing of raw materials - machine debugging and production - sintering of blank mesh belt furnace - machining - heat treatment - deburring - rust prevention and oil immersion - inspection and qualified packaging.

In the production and manufacturing of powder metallurgy gear teeth, the design and production process of the mold should be arranged in place, and the material arrangement of the gears is very particular. There are generally three types of material selection for powder metallurgy gears. FC0208, which is a common copper and carbon steel, is used to make some gears that are not very laborious, especially those made of plastic parts. In order to improve strength and accuracy, powder metallurgy gears are selected to reduce wear and fit accuracy, and the noise will be reduced, Enhanced service life. There are also two types of pre alloy powders, FN0208 and FN0408, commonly known as AB alloy powder and AE alloy powder in the powder metallurgy industry. These two alloy materials are fully mixed by the manufacturer, and have good alloy properties, no segregation, stable composition, and can produce a pressing blank density of over 6.95. Warm pressing technology can also be used, and the pressing blank density can reach 7.2. After high-temperature sintering at 1120 degrees Celsius for 30 minutes, the metallographic bonding is strong and strong. AE alloy powder contains higher alloy components than AB alloy powder. In gear material selection with high strength requirements, powder metallurgy professionals must select materials appropriately based on relevant experience and material properties.

Furthermore, powder metallurgy gears are of great importance in design. Professional and experienced designers will optimize the teeth of the gears to maximize their strength without affecting their performance.

Secondly, the seemingly simple powder metallurgy sintering process is also quite mysterious. When the powder metallurgy gear pre alloy powder is sintered at a temperature below 1120 and less than 30 minutes in the high-temperature zone, the alloy properties of the gear are not fully released, and its strength will be unsatisfactory.

Finally, the heat treatment hardness of powder metallurgy gears should be properly controlled. If it is too low, it is easy to have poor wear strength, and if it is too high and brittle, it will also affect strength.