铸造工艺和合金元素对气缸套切削性能影响.pdf

学兔兔 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：TG25 1 文献标识码：A 文章编号：1001—4977(2009)08—0846—03 EffeCt Of Casting Process and Alloying Elements On Cutting Performance of Cylinder Sleeve HAO Qiao—ling，CHEN Aj—rong。WANG Shou．zhong (Shangqiu Professional Techniques College，Shangqiu 476000，Henan，China) Abstract： In Order to improve the inner quality of the cast iron cylinder sleeve and its cutting performance，and reduce production cost，the duplex smelting process was adopted，in which the iron is melted in the 5 t water cooling cupola and held in the electric furnace．Rea1．time chemical composition of iron melt is monitored by optical spectrum analyzers．Effects of alloying element of raw materials on the microstructure and macroscopic characteristics of cylinder sleeve were analyzed using metallographic microscope．The results show that increasing rate of recarburizing and microstructure refinement can be obtained by adding alloying elements in proportion as Cr(0．25％)， Mo(0。40％)and Cu(0．3％)．In metaI mold centrifugal casting，the mass of casting should fit in with water cooling time，SO as to restrict the formation of D and E type gr