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1、球铁油缸浇注系统补缩无冒口工艺设计VoI.27NO.6Jun.2006铸造技术F0UNDRYTECHN0I0GY?581?铸造技术FoundryTechnology?球铁油缸浇注系统补缩无冒口工艺设计连炜.郑建忠.魏兵.(1.西安工业大学机电工程学院,陕西西安710032;2.浙江轻型起重机械厂,浙江衙州324000;3.西安理工大学材料学院,陕西西安710048)摘要:球铁油缸,材质QT500—7,铸件重101kg,外径0270mm,内径0220mm,壁厚25mm,高750mm,一端球面封口.采用立浇工艺,封口向上.原工艺为阶梯浇注系统,在铸
2、件上部安放1个0120mm×200mm冒口,因冒口下缩孔,浇口引入处缩松,缸壁气孔,夹渣,渗漏废品率54.为了消除铸造缺陷,新工艺根据均衡凝固原理,采用以顶注为主的浇注系统补缩无冒口工艺,用收缩模数法设计直浇道,横浇道,内浇道尺寸,经批量生产验证,消除了缩孔,缩松,气孔,夹渣缺陷.机加工后经250MPa~5rain水压试验无渗漏.工艺出品率从77提高到88.表明采用收缩模数法计算浇注系统尺寸,用浇注系统补缩的无冒口工艺是可靠的.关键词:球墨铸铁;油缸;均衡凝固;浇注系统补缩;模数法中圈分类号:TG255文献标识码:A文章编号:1000—8365
3、l2006)06—0581—03DesignofGatingandFeedingSystemwithoutRisertoProducetheO_lCYIinderofDuct_leIronLIANWei.ZHENGJian-zhong2.WEIBing3(1.SchoolofMechanicalandElectronicEngineering,Xi'anTechnologicalUniversity,Xi'an710032,China;2.ZhejiangLightDerrickMachineFactory,Juzhou324000,China
4、;3.SchoolofMaterialScienceandEngineering,Xi'anUniversityofTechnology,Xi'an710048,China)Abstract:TheoiIcylinderwithanendsphericalSUrfacesea1wasmadeofQT500.7,whichhas101kgweight,270mmexternaIdiameter,220mminternaIdiameter,25mmthicknessand750mmheight.Theverticalgatingsystemwasa
5、dopted,andthesealwasupward.ThestepgatingsystemwasadoptedbytheoriginaIdesign,inwhichariserwithasizeof120mmdiameterand200mmheightwasputonthetopofoilcylinder.Astherearetheshrinkagebelowtheriseranddispersedshrinkageinthejunctionofgateandcasing,thusresultinblowhole,inclusion,andr
6、ejectionratioofleakagewasuptO54%.Inordertoeliminatecastingdefects,thefinalgatingsystemwasdesignedusingproportionalsolidificationtechnology,inwhichthetoppouringsystemwithoutariserwasadopted,thesizesofsprue,runnerandingateweredesignedbymodulicalculationmethod.ItiSverifiedafter
7、abatchofproductionthatthesecastingdefects,suchasshrinkage,dispersedshrinkage,blowholeandinclusion,wereeliminated.Aftermachining,theoilcylinderhasnoleakageatwaterpressure250MPafor5mins.TheoverallyieldofcastingisimprovedfrOm77%tO88%.Theresultsshowthatthegatingandfeedingsystemw
8、ithoutriserisreliablethroughcalculatingthesizesofgatingsystembymodulicalcul
