TiAl基合金离心铸造过程中的层流临界值分析

Analysis of laminar flow critical value for TiAl based alloy during centrifugal casting process

分析了金属型离心铸造ＴｉＡｌ基合金排气阀的充型过程，得出了离心铸造过程中充型速度Ｖ与充型长度之间的关系，以及转台的最大转动角速度ω０ ｍ ａｘ（ｒ／ｍ ｉｎ）的选择依据。结果表明，离心铸造过程中，合金液的充型速度是充型长度的函数，随充型长度的增长而增大；熔体的层流长度随转台最大允许旋转角速度的增大而减小。

In this paper,the filling process for TiAl based alloy melt poured in permanent mould during the process of centrifugal casting has been analyzed.The relation between the filling speed V and the filling length,as well as the choosing rule of maximum allowing angular velocity ω 0 max (r/min) has been obtained.Results show that the filling speed is the function of the filling length during the process of centrifugal casting,and increases with the increase of the filling length.The laminar flow length decreases with the increase of maximum allowing angular velocity.