Open AccessThe Effect of the Holding Pressure Profile on the Metal Injection Molded Component Dimensions after Sintering
Author(s) -
Emir Šarić,
Samir Butković,
Muhamed Mehmedović
Publication year - 2020
Publication title -
tehnički glasnik
Language(s) - English
Resource type - Journals
eISSN - 1848-5588
pISSN - 1846-6168
DOI - 10.31803/tg-20191028112617
Subject(s) - sintering , materials science , metal injection molding , shrinkage , mold , composite material , molding (decorative) , rump , homogeneity (statistics) , metal powder , injection moulding , metal , metallurgy , paleontology , statistics , mathematics , biology
The volumetric flow rate (injection velocity) and the holding pressure are metal injection molding (MIM) parameters that have a strong influence on the green partsdensity and density homogeneity, but their effect on sintered dimensions after sintering is still to a large extent unexplored. To reveal the relationship between the injection moldingparameters and sintered dimensions, ring-shaped components were injection molded by using different values of injection velocities in combination with a rump-down and rumpup holding pressure profile. Afterwards, the green components were catalytically debound and sintered in the nitrogen (N2) atmosphere. Finally, the component dimensions: theheight, inner and outer diameter were measured by using a coordinate measuring machine. The ready-to-mold granules Catamold 310N made of heat resistant stainless steelX40CrNiSi 25-20 (according to the EN standard) powder and polyacetal based binder were used. The results showed that the interaction between the injection velocity and theholding pressure profile can be used to systematically adjust shrinkage after sintering. This approach is based on the dependence of the binder crystallization temperature onpressure, when the powder/binder proportion changes with the injection velocity.