Density Variations in Iron Powder Caused by Die Filling
2000 (English)In: PM2000, 2000Conference paper (Other academic)
In this work the influence of the filling shoe movement on the powder density in a lilled. ring shaped cavity has been investigated. The outer diameter of the cavity was 29 cm and the approximate weight of powder in a filled cavity was 650g. The density variations between different parts of the ring and different types of filling operations have been measured. It has been determined that the movement of the filling shoe causes density variations in the filled powder and that these density variations are identical for rings filled under the same conditions. Conventional filling. where the filling shoe only performs one filling cycle resulted in density variations from 0.354 to 0.363 in relative density. By measuring the particle size distribution in different sections of the rings by laser interferometry it was also possible to detem1ine that the filling shoe movement has a segregating effect on the filled powder. By comparing the amount of segregation with other investigations it was possible to determine that this segregation only has a limited influence (less then 10 %) on the powder density and that the major part of the densification originated from the physical rearrangement of the powder particles.
Place, publisher, year, edition, pages
Powder Metallurgy, Powder Filling, Density Variations, Segregation
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-30163Local ID: 15649OAI: oai:DiVA.org:liu-30163DiVA: diva2:250984
PM2000, November 12-16 2000, Kyoto, Japan.