22-10-2014, 09:30 AM
Abstracts: By each casting process the filling conditions play a significant role on the casting quality. The family of the ductile iron is not excption from that rule. The headstock production praxis by gravity castting process shows that the quality of casting is primarily influednce by filling condtions of gating system andmould cavity. This research work fcoused on the effect of different pouring cup designs, gating dimensions and gating positions, on the fillng patterns casting process. Varouos options of pouring cups and gatng systems were assessed with a high resolutioin camera as well as via modeling and simulation. As a reslult, differnet filling characteristics were analyzed and a big influence not only on the filling pattern of the mould, but also on the quality of casting products was determined. A gating system for adding an alloying material to a molten base metal in immediate connection with casting processes. The gating system has a runner having an inlet, whose cross-sectional area is throttled, a reaction chamber whose sectional area varies along the height of the reaction chamber as a function of the teeming rate and a pressure and mixing chamber. This results in a constant alloying material content of the metal being obtained at a varying teeming rate during the casting process. Depending on the casting to be poured the system may include an overhead melt distributor and techniques for mold casting cavity venting and sprue-feeder extraction.