压铸型的排气面积对金属液卷气影响的数值模拟  

Numerical Simulation of Effects of Die-casting Exhaust Area on Air Entrapment in Castings

作　　者：金明秀[1,2] 吴树森[1] 李龙秀 

机构地区：[1]华中科技大学材料成型与模具技术国家重点实验室,湖北武汉430074 [2]平壤机械大学

出　　处：《热加工工艺》2013年第17期52-54,共3页Hot Working Technology

摘　　要：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。Air entrapment in the molten metal during the injection process is one of the important problems generated in die casting process. The causes of air entrapment can be explained to the high speed filling of liquid metal and the use of incorrect air vent systems. The studies of the main characteristics of flow during filling can be found in the reference book, in most of results, air effects on the fluid flow are usually neglected, ha this study, using the numerical simulation method based on the SOLA-VOF approach, it is carried out the numerical simulation on the effects of air on the fluid flow during injection process. The simulation results show that, with the increase of exhaust area, air entrapment is reduced, but not always reduced. When ratio between exhaust area and ingate area is 0.3-0.5, it has optimal qualities, air entrapment quantities can be decreased.

关 键 词：卷气量 充型过程 数值模拟 压铸 

分 类 号：TG249.2[金属学及工艺—铸造]