Abstract
The PIM (powder injection molding) process consists of several steps in which faults can occur. The quality of the part that is produced usually cannot be seen until the end of the process. It is therefore necessary to find a way to discover the fault earlier in the process. The cause of defects is very often “phase separation” (inhomogeneity in powder distribution), which can also be influenced by the holding pressure. This paper evaluates the powder distribution with a new method based on density measurement. Measurements were made using various holding pressure values.
Highlights
Powder injection molding technology (PIM) is a very effective and precise technology, especially for producing small metal and ceramic parts with complex shapes in large-scale production
This paper describes the influence of holding pressure on powder distribution in various places in the specimen characterised by a new method — density measurement
In the case of PIM, the flow properties are significantly different from the case of conventional injection-molding, because of the smaller amount of polymeric material and the combination with inorganic grains
Summary
Powder injection molding technology (PIM) is a very effective and precise technology, especially for producing small metal and ceramic parts with complex shapes in large-scale production. The technology itself consists of two subcategories, CIM (ceramic injection molding) and MIM (metal injection molding). A clear difference between CIM and MIM is in the use of different feedstocks, where a different powder is used (either metal-based or ceramic-based). The processing is very similar to standard injection molding, but due to the highly abrasive properties of the powder it is necessary to use a suitable machine with abrasion-resistant parts (screw, cylinder etc.) After the injection-molding stage of the process, it is necessary to take out the binder. The aim of our project is to study the influence of holding pressure on the quality of the molded part. This paper describes the influence of holding pressure on powder distribution in various places in the specimen characterised by a new method — density measurement
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