发动机缸盖铸造技术中若干问题的探讨

随着发动机技术的不断发展,使发动机灰铸铁缸盖成为强度高、壁薄、尺寸精度要求高、内外表面质量要求高、结构复杂的铸件.国内汽车发动机缸盖铸造工艺主要有平浇和立浇两种,在生产中均取得了成功的经验.立浇工艺一般为整体组芯,平浇工艺则有散组芯和整体组芯.根据当今国内外铸造行业技术现状及应用成果,结合本公司康明斯缸盖立浇工艺的生产经验,分析灰铸铁柴油发动机缸盖生产过程中常见铸造缺陷的产生原因,提出了解决这些缺陷的措施.重点阐述解决发动机缸盖气孔、夹杂物孔洞、砂眼、渣眼、渗漏等铸造缺陷的关键措施.

Discussion on Several Crucial Issues About Cylinder Head Foundry Technology

With the development of engine technology,cylinder head becomes a casting with high intensity,thin wall,high precision of dimension,high quality of external and internal surface,and complex structure.The domestic casting processes of cylinder head mainly include horizontal-pouring and vertical-pouring,and both of which have gotten successful experience in production.Vertical-pouring process is mostly based on the group cores,while horizontal-pouring process normally includes both separate cores and group cores.According to domestic and overseas actuality and achievement of foundry technology,and combined with the production experience of vertically-pouring for Cummins cylinder head,the common casting defects of diesel cylinder head of gray iron were analyzed,and the measures of removing these casting defects were pointed out,especially the key measures for gas hole,sand hole and slag inclusion.