立式离心铸造过程中熔体横截面的变化规律

Change rule of sectional area of melts during vertical centrifugal casting process

对Ti合金立式离心铸件的充填和凝固过程进行研究。结果发现,在离心场下,柯氏力对熔体运动方向的改变影响非常大,熔体沿着与旋转方向相对的型壁进行正向加速充填,当达到最远端后反向充填。在正向充填过程中,对没有内浇道的铸型,熔体在横浇道内的截面面积随充填长度的增加而逐渐减小,当横浇道侧壁存在内浇道时,熔体通过内浇道进入型腔,导致熔体在内浇道入口处产生速度降,熔体横截面面积在该处有所回升,然后随充填长度的增加而减少。同时,旋转方向对有内浇道铸型的充填顺序影响非常大。

The filling and solidification of titanium alloy melts in the vertical centrifugal filed were investigated. The results show that the coriolis force plays an important role in the change of melts flow direction. With the action of the centrifugal force and coriolis force, the melts stick one of side of the mould to fill and the side is opposite to the rotational direction. The whole filling process includes two filling parts： forward filling and back filling. During the forward filling process, the sectional area of the mould without the ingate decreases with the increase of filling length, but which is changeable with the increase of the filling length for the mould with ingate. The rotational direction plays an important role in the filling sequence of the mould with ingates.