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以镁合金摩托车轮毂为例,设计了双向断环形横浇道和单向断环形横浇道两种浇注系统。在浇注温度680℃,模具预热温度250℃,压射速度3.0m/s,保压压力60MPa的工艺条件下,用数值模拟软件对该轮毂的铸造工艺过程进行了仿真分析。结果表明:采用单向断环形横浇道的浇注系统比双向断环形横浇道浇注系统充型合理,能明显减少轮毂的卷气、夹杂等缺陷,且模具型腔加工更简单。
Taking the magnesium alloy motorcycle wheel hub as an example, two kinds of pouring systems are designed, such as bi-directional broken ring runner and unidirectional broken ring runner. Under the conditions of pouring temperature of 680 ℃, mold preheating temperature of 250 ℃, casting speed of 3.0m / s and holding pressure of 60MPa, the casting process of the hub was simulated by numerical simulation software. The results show that the pouring system with one-way broken runner is more reasonable than the two-way runner-type runner pouring system, which can obviously reduce the air entrainment and inclusion of the hub, and the processing of the mold cavity is simpler.