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卷气是压铸工艺的基本缺陷之一,因压射过程中型腔里的空气被裹入金属液。卷气发生原因主要是金属液高速充型和排气道设计不合理。现有充型流动分析文献大部分都未考虑压射过程中型腔里的空气对金属液卷气的影响。本研究采用基于SOLA-VOF算法的数值模拟方法,对排气面积对金属液卷气影响进行数值模拟。研究结果表明:随着排气面积增加,卷气量减小,但并非一直减小。排气道截面积/内浇口截面积=0.3~0.5时最合理,卷气量小。
Curl is one of the basic defects of the die-casting process, because the air in the cavity during the injection process is wrapped in liquid metal. The main reason for the unpleasant gas is liquid metal high-speed filling and exhaust port design unreasonable. Most of the existing filling flow analysis documents do not consider the influence of the air in the cavity during injection on the liquid metal gas. In this study, a numerical simulation method based on SOLA-VOF algorithm was used to simulate the influence of exhaust area on liquid metal voids. The results show that: with the increase of exhaust area, air volume decreases, but not always decreases. Exhaust cross-sectional area / inner gate cross-sectional area = 0.3 ~ 0.5 when the most reasonable, a small volume of air.