摘要
介绍了MKJ水冷灰铸铁排气管的铸件结构及技术要求,并详细阐述其生产工艺：覆砂铁型铸造,采用带有过滤网和集渣包的半开放式浇注系统;型腔覆砂层为8~10 mm;在砂芯中安放芯骨,芯头以相连的方式来加强砂芯结构强度;孕育剂为75%的SiCaBa＋25%的75SiFe,包内加入,加入量为0.4%,处理温度为1 500~1 515℃,浇注温度为1 410~1 440℃。最终生产的MKJ排气管无裂纹、漏气等现象发生;金相组织为：石墨全部为A型,石墨长度为4级,基体组织为95%的珠光体;抗拉强度为275 MPa,硬度为202 HB。
The configuration and technical requirements of MKJ water-cooled exhaust manifold were introduced. Its detailed production process was described：using resin sand-coated iron mold casting process,using semi-nonpressured gating system with filter and slag collector;the coated sand layer thickness of the mold cavity was of 8~10 mm;using core iron and conjoined core prints to strengthen the core’s construction;the inoculant was consisted of 75% SiCaBa＋25% 75 SiFe and was added in ladle,its adding amount was of 0.4%;treating temperature was of 1 500 ~1 515 ℃,pouring temperature was of 1 410 ~1 440 ℃. The finally produced MKJ exhaust manifolds have no cracking,no gas leakage;casting microstructure was as follows：all graphite was of A type,graphite length was of 4 class,matrix structure was of 95% pearlite;tensile strength was of 275 MPa,hardness was of 202 HB.
出处
《现代铸铁》
CAS
2014年第5期31-34,共4页
Modern Cast Iron
关键词
灰铸铁
覆砂铁型
水冷排气管
gray iron
sand-coated iron mold
water-cooled exhaust manifold
