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研究立式离心场下不同铸造工艺参数对钛合金熔体的充填及凝固缺陷形成的影响。结果显示,立式离心场下得到的钛合金铸件质量优于重力场下的铸件。立式离心场下,合金熔体由于受离心力和科氏力的作用,沿着与旋转方向相对的型壁进行充填,且熔体的截面面积随充填长度的增加而逐渐减小,但是在内浇口处由于速度降低导致截面面积有所回升。此外,铸型的旋转方向,旋转半径及旋转速度直接影响铸件缺陷的形成。旋转方向直接影响合金熔体的充填顺序,进而影响合金熔体的凝固顺序及缺陷位置。实验结果显示,旋转半径及旋转速度的增加有利于减少铸件的缺陷体积。
The influence of different casting process parameters on the filling of titanium alloy melt and the formation of solidification defects under vertical centrifugal field was studied. The results show that the quality of the titanium alloy castings obtained under the vertical centrifugal field is better than the castings under the gravity field. Vertical centrifugal field, due to centrifugal force and Coriolis force due to the melt, along the direction of rotation opposite the wall filling, and the cross-sectional area of the melt with the filling length increases with the increase, but in Gate area due to reduced speed led to cross-sectional area has picked up. In addition, the mold rotation direction, radius of rotation and speed of rotation directly affect the formation of casting defects. The direction of rotation directly affects the filling sequence of the alloy melt, which in turn affects the order of solidification and the defect location of the alloy melt. The experimental results show that the increase of radius of rotation and rotation speed can reduce the defect volume of castings.