What’s the Difference between Powder Metallurgy Extrusion Molding And Injection Molding
Powder metallurgy forming process is generally divided into four kinds: pressing forming, injection forming, powder forging and powder rolling. At present, the most commonly used and more advanced POWDER metallurgy processing technology is injection molding (MIM) technology and pressing forming (PM) technology. Next, will describe the difference between them in detail.
1. What is powder metallurgy technology?
Powder metallurgy technology is the first in the United States in 1870, with a metal powder as raw material, and then pressed copper lead alloy bearing to achieve self-lubricating bearing technology, through the pressing and sintering production of various parts of the processing technology.
2. Basic process of powder metallurgy technology
The main material is decomposed into fine powder, which is then added to the desired mold, moulded by (injection) or pressure, and finally sintered to obtain the desired part and effect. Some parts require post-treatment.
3. powder metallurgy injection molding and extrusion molding difference?
i: Powder metallurgy injection molding
Powder metallurgy injection molding (MIM) was born in California, USA in 1973, which is a new type of powder metallurgy forming technology invented by combining plastic injection molding technology with powder metallurgy field. Powder metallurgy close to injection molding process with powder metallurgy technology, powder metallurgy is the use of very fine powder injection forming a large number of thermoplastic adhesive mixing together, through 150 degrees high temperature heating plasticizing, injection to the forming mold, injection mold cavity with injection molding equipment, coagulation, and then use the method of thermal decomposition of binder removal from the billet. Finally, as in powder metallurgy, precision parts are produced by sintering.
Injection molding powder metallurgy production lines generally require mixing, injection, solvent degreasing, thermal degreasing (vacuum, atmosphere furnace), sintering furnace (degreasing and sintering can also be carried out in one furnace), subsequent processing (including heat treatment, machining, polishing, etc.) equipment. Injection molding is suitable for small size complex shape parts, generally not more than 3mm wall thickness, because large amounts of organic matter is difficult to remove. As for the weight of a single piece theoretically there is no limit, but the size is too large will also have problems such as insufficient cavity filling.
Because it can press in many directions, it can produce some complex structural parts which cannot be produced by pressing, and the density can be higher than powder metallurgy pressing. But the cost is generally several times that of forming. It’s not worth it as it doesn’t have a big batch.
ii: powder metallurgy pressing forming
Powder metallurgy press forming is using powder to rely on gravity to fill the die, through the machine pressure extrusion forming.In the actual industrial application is the most widely used one, cold closed steel die pressing, cold isostatic pressing, hot isostatic pressing, warm pressing are pressing forming.But because can up and down two-way pressing, some complex structural parts can not be produced, or can only be made of blank material.
No matter which type of powder metallurgy forming method is selected, the premise needs to be reasonable according to the characteristics of the finished product to be made.
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