离心铸管充型过程中夹杂物运动规律数值模拟研究及应用

Numerical simulation study and application of inclusion movement in centrifugal casting pipe filling process

摘要:

对卧式离心铸造充型过程中流体质点受力进行分析，根据夹杂物运动规律推断出不同种类夹杂物沉淀分离时间及最佳浇注温度。基于Procast软件建立了卧式离心铸造充型过程夹杂物运动追踪，对离心铸管在不同转速条件下夹杂物运动轨迹及最终停留位置进行了数值模拟及工艺优化。在此工艺参数条件下，对离心铸管进行了实际浇铸实验，利用光学显微镜（OM）、扫描电镜（SEM-EDS）获得其夹杂物分布信息。实际铸件夹杂微观分析结果与数据模拟一致，验证了预测及模拟结果的有效性。结果表明夹杂物比重越小、粒子尺寸越大，分离时间越短。 5μm的 SiO2夹杂最容易在离心力的作用下从金属液中甩出，并最终停留在铸管内表面。适合L605离心铸管最佳浇注温度为1580℃，离心转速为2800r/min。

Abstract:

The force of fluid particles in the filling process of horizontal centrifugal casting was analyzed, and the precipitation separation time of different kinds of inclusions and optimal pouring temperature were deduced according to the movement law of inclusions. The movement trajectory of inclusions in the filling process of horizontal centrifugal casting was established using ProCAST software, and the numerical simulation and process optimization of the movement trajectory and final residence position of inclusions in centrifugal casting pipes under different rotating speeds were carried out. Under the condition of these process parameters, the actual casting experiment of centrifugal cast pipe was carried out, and the inclusion distribution information was obtained by optical microscope (OM) and scanning electron microscope (SEM-EDS). The microscopic analysis results of inclusions in actual castings were consistent with the data simulation, which verified the effectiveness of the prediction and simulation results. The results showed that the smaller the specific gravity of inclusions and the larger the particle size, the shorter the separation time. It was found that 5 μm SiO2 inclusions were most likely to be thrown out of the liquid metal under the action of centrifugal force and finally stay on the inner surface of the cast pipe. The optimal pouring temperature for L605 centrifugal cast pipe was 1580 ℃, and the optimal centrifugal speed was 2800r/min.