中国铸造2008，Vol.5Issue(4)：249-257,9.
Effects of centrifugal and Coriolis forces on the mold-filling behavior of titanium melts in vertically rotating molds
Effects of centrifugal and Coriolis forces on the mold-filling behavior of titanium melts in vertically rotating molds
摘要
Abstract
The vertical centrifugal-casting technique is widely used in the manufacture of various irregularly-shaped castings of advanced structural alloys with thin walls, complex shapes and/or large sizes. These castings are used in the increasing applications in aero-space/aviation industries, human teeth/bone repairs with near-net shaped components, etc. In a vertically rotating casting system, the mold-filling processes of alloy melts, coupled with solidification-heat transfer, may be much more complicated, because they are driven simultaneously by gravity, centrifugal and Codolis forces. In the present work, an N-S/VOF-equations-based model, solved using a SOLA-VOF algorithm, under a rotating coordinate system was applied to numerically investigate the impacts of centrifugal and Coriolis forces on metallic melt mold-filling processes in different vertical centrifugal-casting configurations with different mold-rotation rates using an authors' computer-codes system. The computational results show that the Coriolis force may cause remarkable variations in the flow patterns in the casting-part-cavities of a large horizontal-section area and directly connected to the sprue via a short ingate in a vertical centrifugal-casting process. A "turn-back" mold-filling technique, which only takes advantage of the centrifugal force in a transient rotating melt system, has been confirmed to be a rational centrifugal-casting process in order to achieve smooth and layer-by-layer casting-cavities-filling control. The simulated mold-filling processes of Ti-6Al-4V alloy melt, in a vertical centrifugal-casting system with horizontally-connected plate-casting cavities, show reasonable agreement with experimental results from the literature.关键词
centrifugal casting/Coriolis force/mold-filling/solidification-heat transfer/computer simulationKey words
centrifugal casting/Coriolis force/mold-filling/solidification-heat transfer/computer simulation分类
矿业与冶金引用本文复制引用
Xu Daming,Jia Limin,Fu Hengzhi..Effects of centrifugal and Coriolis forces on the mold-filling behavior of titanium melts in vertically rotating molds[J].中国铸造,2008,5(4):249-257,9.基金项目
The study was supported by the NNSF of China(key program,grant No.50291012)and a National Key Project. （key program,grant No.50291012）
