汽车发动机用粉末冶金主轴承盖

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 for automotive engines

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...