1 results listed
Inserted powder injection molding (IPIM) is developed
to produce a larger volume parts in powder injection molding
(PIM). In this method, the injection process is carried out on the
part called insert. Since the injection volume gets smaller, the
debinding time decreases. However, the insert diameter/the
molding diameter ratio (Di/Dm) is the important parameter in that
method. There could occur crack in the injection side unless the
ratio determines properly. In this study, the insert and injection’s
materials is high speed steel (HSS) and WC-%9Co feedstock,
respectively. Different amount of expansion occurs since the
materials have different thermal expansion coefficients. This
difference causes a thermal stress in the connection surface. If the
resulting thermal stress exceeds the compressing strength of the
material in the injection side, then thermal cracks occur.
Mathematical calculations have been carried out to determine the
optimum ratio of Di/Dm. In order to validate the calculations, finite
element analysis was performed by ANSYS software. Theoretical
results were supported with experimental studies. The risk of
cracking in the injection side increases as the ratio of Di/Dm
increases. As a result of the study, the optimum ratio of Di/Dm was
determined as 0.45 for the part produced by PIM.
International Iron & Steel Symposium
UDCS
Oğuz Yılmaz
Kamran Samet
Harun Koçak
Çetin Karataş