Ninety percent of automotive precision parts are manufactured by powder metallurgy. The powder metallurgy process includes PM press forming technology and MIM injection molding technology. Automotive gears, automotive bearings, automotive tailgate parts, and automotive wiper parts are basically pressed with PM Forming technology production.

Factor Ⅰ: the influence of the press forming mold

The importance of the mold to the press forming technology is self-evident. It is recommended to use a female mold or mandrel made of cemented carbide, powdered high-speed steel and other materials. The mold works and the surface roughness is as small as possible to reduce powder particles and mold The friction factor between the walls.

Factor Ⅱ: the influence of lubricants

Adding lubricant to the metal mixed powder can effectively reduce the friction between the powder and between the powder and the mold wall, and make the density distribution of the compact more uniform. The commonly used lubricant is zinc fatty acid. Although it can improve the press forming conditions, due to its low bulk density, segregation is easy to occur after mixing, and sintered parts are prone to pitting and other problems.

Factor Ⅲ: The influence of suppression parameters

1: Pressurizing speed

If the pressing speed is too fast, it will affect the uniformity of the green compact density and will also cause cracks. It is better to use a hydraulic powder forming machine to produce it.

2: Holding pressure time

Under the maximum pressing pressure and holding the pressure for an appropriate time, the compact density of the powder metallurgy pressing of automobile parts can be significantly increased.

3: The structure of powder feeding boots

If a universal powder feeding shoe is used for powder filling, uneven powder filling will occur up and down or before and after the cavity, which will affect the quality of the compact. Improving or redesigning the powder feeding shoe can improve the uniformity of powder filling.