铝活塞铸件顶部气孔缺陷分析与改进  

Analysis and Optimization of Crown Bubble Defects in Aluminum Piston Casting

作　　者：李庭勇 LI Tingyong(Kolbenschmidt Huayu Piston Co.,Ltd.,Shanghai 201814)

机构地区：[1]华域科尔本施密特活塞有限公司,上海201814

出　　处：《特种铸造及有色合金》2024年第7期1000-1003,共4页Special Casting & Nonferrous Alloys

摘　　要：顶部气孔是带铸造顶部活塞最主要的铸造缺陷,也是导致发动机活塞失效的主要原因之一。通过对顶部气孔缺陷的再现试验,研究了铝液温度、浇注速度、过滤网结构、过滤网位置对气孔缺陷的影响。结果表明,过滤网漏放或位置偏移是造成顶部气孔的主要原因,结合铸造模拟仿真分析进一步验证了缺陷再现试验的可靠性。通过优化过滤网固定槽的结构,解决了过滤网位置偏移,有效避免了气孔缺陷的产生;通过红外线感应器检测过滤网漏放情况,保证了漏放过滤网铸件的及时检出。Crown bubbles are the main casting defects of piston with casted crown,which is also one of the main causes of engine piston failure.Through the reproduction test of crown bubbles,the influence of aluminum liquid tem⁃perature,pouring speed,filter mesh structure,and filter position on the defect was investigated.The results indicate that the missing filter or position deviation are the main causes of crown bubbles,which is further verified by simulation analysis.By optimizing the structure of fixation groove in filter,the deviation of filter position is effectively solved and the crown bubbles are eliminated.The casting missing filter was identified by infrared sensor to ensure the timely detec⁃tion of leakage.

关 键 词：铝活塞 铸件 顶部气孔 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG249.6[金属学及工艺—金属材料]