摘要
粉末冶金主轴承盖(MBC)于1993年第一次用于GM的3100与3800V6发动机。该零件一年消耗粉末5 000多t,是北美粉末冶金零件中应用量最大者。选择粉末冶金材料替代传统的铸铁,是因为其有利于零件的功能,而且因为粉末冶金工艺能成形为最终形状,从而使GM可节省下对主轴承盖的切削加工生产线的大部分投资。由于灰铸铁强度不够高,球墨铸铁的价格高又难切削加工,因此,为这种零件开发了一种强度高、成本低的粉末冶金合金钢。这篇论文说明了主轴承盖的功能要求,比较了铸铁与粉末冶金的材料和生产工艺,说明了粉末冶金的设计利益;此外,还讨论了粉末冶金主轴承盖要求的强度、一致性、完善性(无缺陷)及切削性,其中包括试验与试验验证。
Powder metallurgy main bearing caps （MBC） are being used for the first time in General Motors （GM） 3100 and 3800 V6 engines in 1993. This product will consume over 5 000 tons of powder a year making it the biggest volume application for P/M in North America. P/M was chosen to replace the tradi - tional material, cast iron, because of its functional advantages and because its net shape capability eliminated major investments in MBC machining lines at GM. A high strength low cost P/M alloy steel was developed for this application,since grey cast iron was not strong enough and ductile cast iron was both expensive and difficult to machine. The paper explains the func - tional requirements of an MBC. The cast iron and P/M materials and processes are compared and the design benefits of P/M are described. In addition, the P/M MBC requirements of strength, consistency, integrity （freedom from defects） and machinability are discussed,including the various experiments and verification tests.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2009年第5期387-393,共7页
Powder Metallurgy Technology
关键词
粉末冶金
主轴承盖
汽车
发动机
powder metallurgy
main bearing caps （ MBC ）
automotive
engines
