铸造工艺及合金元素对气缸套切削性能的影响.pdfVIP

铸 造 Aug．2009 · 846 · FOUNDRY Vo1．58 NO．8 铸造工艺及合金元素对气缸套切削性能的影响 郝巧玲，陈爱荣，王守忠 (商丘职业技术学院，河南商丘 476000) 摘要 ：为提高铸铁气缸套的内在质量，改善其切削性能，降低加工成本，采用5tzk冷冲天炉熔炼铁液，电炉保温的双联 熔炼工艺，并采用合金光谱快速分析仪对铁液化学成分进行实时监控；利用金相显微镜对气缸套的原辅材料各合金元素 对材质的微观组织和宏观特性的影响进行了分析。结果表明：调质过程中加入一定配比的Cr(0．25％)、Mo (0．40％)和 Cu (0．3％)等合金元素，促使组织细化，可达到提高增碳率的目的；金属型离心铸造气缸套时铸件质量与水冷时间应 相适宜限制了组织中D、E型石墨的形成；含钡孕育剂能够获得分布均匀，形态细长的A型石墨。原辅材料、铸造工艺、 合金元素等是造成气缸套加工性能差异很大的主要因素。 关键词：铸铁气缸套；铸造工艺；合金元素；切削加工性能 中图分类号：TG251 文献标识码 ：A 文章编号：1001—4977 (2009)08—0846—03 EffeCtOfCastingProcessandAlloyingElementsOn CuttingPerformanceofCylinderSleeve HAOQiao—ling，CHENAj—rong。WANG Shou．zhong (ShangqiuProfessionalTechniquesCollege，Shangqiu476000，Henan，China) Abstract： In Orderto improve the innerqualityofthe castiron cylindersleeve and its cutting performance，andreduceproductioncost，theduplexsmeltingprocesswasadopted，inwhichtheiron ismelted in the 5 twatercooling cupola and held in the electric furnace．Rea1．time chemical compositionofironmeltismonitoredbyopticalspectrum analyzers．Effectsofalloyingelementof raw materialsonthemicrostructureandmacroscopiccharacteristicsofcylindersleevewereanalyzed using metallographic m icroscope．The results show that increasing rate ofrecarburizing and microstructurerefinementcanbeobtainedbyaddingalloyingelementsinproportionasCr(0．25％)， Mo (0。40％)andCu (0．3％)．InmetaImoldcentrifugalcasting，themassofcastingshouldfitin withwatercoolingtime，SOastorestricttheformationofDandEtypegraphite．W ell—distributedand slenderA type graphite was obtained by adding inoculantwith Ba．The main reasons ofthe differences in the cylinder sleeve processing performance attribute to the raw and aux