PIM and PM pressing have their own advantages in technology. Shandong NO2 machinery factory will tell you what powder metallurgy is and what is the difference between PIM and PM pressing?

I: What is powder metallurgy technology?

Powder metallurgy technology was first developed in 1870 in the United States by using metal powder as raw material, then pressing copper-lead alloy bearings to achieve self-lubrication, then through pressing and sintering to produce various parts.

II: Basic Procedures of Powder Metallurgy Technology

First, decompose the main material into fine powder. Then add the powder to the required mould. The next step is to form the model through pressing, and finally sinter to get the desired parts. Some parts need to be post-processed by other ways.

III: The difference between PIM and PM pressing.

1: Powder Injection Molding

Powder metallurgy injection moulding (PIM) was used in California in 1973. It is a new type of powder metallurgy moulding technology, which combines plastic injection moulding technology with powder metallurgy. PIM is similar to powder metallurgy technology. Firstly, solid powder and organic binder are evenly mixed together, plasticized by heating at 150 degrees, and injected into the mould cavity by injection equipment, then solidified. Next, the binder in the forming blank is removed by thermal decomposition. Finally, like powder metallurgy, precise parts are produced by sintering.

2: Powder Metallurgy Compression Molding

PM pressing is a kind of mechanical extrusion process in which powder is filled by gravity. In practical industrial applications, it is one of the most widely used that includes cold closed steel die pressing, cold isostatic pressing, hot isostatic pressing and warm pressing. However, some complex structural parts cannot be produced, or can only make the blank bodies because of its two-way pressing.

To use PIM or PM pressing depends on different products and requirements. PIM have higher precision and strength, but PM pressing has price advantage. How to choose them? Welcome to ask us.