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针对某压铸件厂在生产过程中慢压射阶段易发生卷气的问题,探究慢压射过程中加速度的选择对最终压射室中气体含量的影响。建立某型号压铸机压射室的模型,运用合理的公式计算相应条件下的慢压射速度及加速度,并选择3种不同的加速方式,以CFD仿真软件Fluent模拟出不同加速情形下的流场分布。结果表明:三种加速条件下,都存在一定程度的卷气现象,但是卷气量的多少及发生卷气的部位有所不同,相较而言,采用带有初速度的加速方式效果较优。
Aiming at the problem that some die-casting factory is prone to curl in the slow injection stage during production, the effect of acceleration selection on the gas content in the final injection chamber is explored. The pressure injection chamber model of a certain type die-casting machine is established. The slow injection velocity and acceleration under the corresponding conditions are calculated by reasonable formulas. Three different acceleration modes are selected. The CFD simulation software Fluent is used to simulate the flow field under different acceleration conditions distributed. The results show that there is a certain degree of air entrainment under the three kinds of accelerating conditions, but the amount of air entrainment and the location of air entraining are different. In contrast, the acceleration method with initial speed is better.