【作者】 饶群章； 张元好； 何汉军； 史秋月；

【Author】 RAO Qun-zhang ZHANG Yuan-hao HE Han-jun SHI Qiu-yue (Hubei Automotive Industry Institute,SHIYAN HUBEI 442002)

【机构】 湖北汽车工业学院；

【摘要】 铬球铁的产生,始自在曲轴上的应用,曲轴是材料研究的典型零件。根据曲轴的受力条件和实践证明.曲轴的失效,绝大多数都是疲劳破坏,或由于轴颈或轴承磨损引发的弯曲疲劳。因此对曲轴的要求是轴颈耐磨性能好,以及整体疲劳性能高。通过多次的试验和实践,证明铬球铁具有超群的疲劳性能和优异的耐磨性,球铁生产成本显著低于其它合金球铁,生产实践也证明它的铸造性能甚佳,很适于生产曲轴和各种薄壁小件。对增压柴油机曲轴,在QT700—2的基础上,进行强化处理(圆角滚压或氮化加圆角滚压),就有很好的效果。不遗余力的追求高牌号是一大误区。如生产QT900-2,不仅要付出高成本的代价,且达不到预期目的。铬球铁不仅适用于小批手工砂型铸造,也适于消失模铸造和各种大批量自动线的生产。最近一年已应用于铁模覆砂工艺,铸造斯太尔、6BT等曲轴获得成功和效益。更多还原

【Abstract】 Cr-DI produced initially on the application to cast crankshaft which is a typical parts for materi- als research.According to the crankshaft of the work conditions and practices that Crankshaft failure,the overwhelming majority are fatigue failure,or bending fatigue caused by a journal or bearing wear.Hence the request of the crankshaft journal wear resistance is good,high-performance and the overall fatigue. Through repeated experiments and practice,that Cr-DI have superior fatigue properties and excellent wear resistance,and its costs of production 1s significantly lower than other alloy DI.Practice shows that it has a good casting properties,it is suitable for production of crankshaft and various small pieces of thin-walled.The turbocharged diesel engine crankshaft is cast in QT700-2 on the basis of a strengthen- ing treatment (fillet rolled or nitride and Roll),have very good results.Spare no effort in pursuit of high-grade is a big misunderstanding.For example,production QT900-2,not only have to pay the price of high costs,and amounted to less than desired results. Cr-DI applies not only to a small group of hand-sand casting,but also suitable for EPC and vari- ous high-volume automatic production line.Last year,some foundries have been used a sand-iron Die to Cast 6BT crankshafs,such as the success and receipt of benefits.更多还原