Sintered mechanical parts
Part dimension
The dimensions that is possible to obtain depend mainly upon the surface of the cross-section of compression direction: the larger the surface, the greater is the force necessary to compact the item and likewise the size of the press.
In the Design Section, we calculate that 5.5 tonnes/cm² are necessary to compact items with a medium density.
In the Compression direction, the constraints are determined by the stroke of the press and also by the necessity to maintain constant density throughout the entire part.
In practice, it is unavoidable that the compaction force (and therefore the resulting density) is not maintained at a constant level along the whole height of the part due to the friction between the powder and the tool. It will be lower in the zones which are furthest from the punch faces: the greater the part thickness, the greater the distance between the punch faces and, therefore, the greater the variance in density