缸体铸件气孔缺陷成因分析及改进措施  

Cause Analysis and Improvement Measures of Porosity Defects in 2.5L Diesel Engine Cylinder Castings

作　　者：刘浩辉[1] 郑锐[1] 龚连金 LIU Haohui;ZHENG Rui;GONG Lianjin(Hefei Jianghuai Casting Co.,Ltd.,Hefei 231137,Anhui China)

机构地区：[1]合肥江淮铸造有限责任公司,安徽合肥231137

出　　处：《铸造工程》2024年第4期34-38,共5页Foundry Engineering

摘　　要：2.5 L柴油机缸体铸件在工艺验证和小批量生产阶段,水套部位气孔为最突出的铸造缺陷,主要是由于水套砂芯发气未有效排出和水套结构孤立高点铁液温度低所致。通过增加内浇道优化浇注系统、设置排气通道回路增加水套砂芯排气、提高浇注温度等措施,有效解决了水套的气孔缺陷问题。经生产验证,气孔缺陷废品比例大幅度下降,由原来的11%左右下降到了0.6%左右。In the process verification and small batch production stage of 2.5 L diesel engine cylinder block castings,the pores in the water jacket part are the most prominent casting defects,which are mainly caused by the ineffective gas discharge from the water jacket sand core and the low liquid iron temperature at the isolated high point of the water jacket structure.By adding internal runners to optimize the pouring system,setting exhaust channel circuits to increase the exhaust of the water jacket sand core,and increasing the pouring temperature,the problem of porosity defects in the water jacket has been effectively solved.After production verification,the proportion of defective waste products of pump holes has decreased significantly,from about 11%to about 0.6%.

关 键 词：缸体 气孔 工艺优化 砂芯排气 三层内浇道 

分 类 号：TG245[金属学及工艺—铸造]