新型倾斜式冷却剪切技术三维数值模拟

Three-dimensional simulation of novel sloping cooling/shearing process

自行设计制造了改进的倾斜式冷却技术试验装置，用来制备半固态Al-3％Mg合金坯料。建立了模拟制备半固态Al-3％Mg合金三维分析模型。结果表明：冷却斜板的倾角对合金温度场与速度场分布具有明显影响，出口温度与速度随斜板倾角增大而增大，合金温度沿合金中心线从浇口到出口基本成线性逐渐降低。合金出口温度随着浇注温度的提高而明显升高。为制备具有良好质量的半固态Al-3％Mg合金坯料，倾角θ=45°比较合理，浇注温度控制在650℃～660℃的温度范围，不能高于700℃。

A self-designed setup of novel sloping cooling process was made to prepare semisolid Al-3 % Mg alloy. Three-dimensional simulation model was established for analysis of preparing semisolid Al-3 % Mg alloy. Through simulation and experiment, it is shown that the sloping angle of the plate greatly affects temperature and velocity distributions, the temperature and velocity of the alloy at the exit of the sloping plate increase with the increase of the sloping angle. Alloy temperature decreases linearly from the pouring mouth to the exit. Alloy temperature at the exit increases obviously with the increase of pouring temperature. To prepare semisolid Al-3%Mg alloy with good quality, the sloping angle = 45° is reasonable, and the pouting temperature is suggested to be designed above 650℃ - 660℃ but under 700 ℃.