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建立了483Q发动机排气阀的三维模型;采用数值模拟的方法,分析了排气阀离心铸造充型及凝固过程,预测了铸造缺陷位置;设计了二因素三水平的正交试验表,分析了浇注温度、型模温度的变化对铸件质量的影响,确定了浇注温度900℃、型模温度40℃、离心转速300 r/min为最优参数组合,并进行了浇口尺寸优化;优化后重新分析发现,排气阀出现铸造缺陷的概率最低。该结论可为排气阀的离心铸造生产提供一定理论指导。
The three-dimensional model of 483Q engine exhaust valve was established. The filling and solidification process of centrifugal valve was analyzed by numerical simulation. The position of casting defect was predicted. An orthogonal experiment table with two factors and three levels was designed. Pouring temperature and mold temperature on the quality of castings, the optimum parameters of pouring temperature 900 ℃, mold temperature 40 ℃ and centrifugal speed 300 r / min were determined and the gate size was optimized. Analysis found that there is the lowest probability of casting defects in the exhaust valve. This conclusion can provide certain theoretical guidance for the centrifugal casting of exhaust valve.