摘要
由消失模铸造生产的铝合金发动机铸件一直受气孔和漏水缺陷的困扰,其形成原因复杂。采用数值模拟的方法对直列式六缸发动机的消失模充型、凝固过程进行模拟,并预测其缺陷产生的部位。结果显示,现有浇注系统的设计不合理导致充型结束后,铸件内产生较大的温度梯度;各个内浇道的流量差别大,最高达20%,因此无法实现自补缩,是导致铸件成形后产生气孔的根本原因。
There often exists gas hole and leakage defects in lost foam casting aluminum alloy straight six-cylinder engine housing. Origination of the defects is very complex. Filling and solidification process of the engine housing were simulated to predict potential defect position. The results reveal that existing gating system can result in severe temperature gradient in the engine housing after filling. Meanwhile,different ingates exhibit distinctly different in fluid volume,where the maximum different value reaches up to 20%,which is responsible for the formation of gas hole in engine housing as a result of not realizing self-feeding.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2010年第8期743-745,共3页
Special Casting & Nonferrous Alloys
关键词
直列式六缸发动机
消失模
数值模拟
气孔
Straight Six-cylinder Engine,Lost Foam Casting,Numerical Simulation,Gas Hole
