风电箱体铸件气孔缺陷的解决方法  

Solutions for Gas Hole Defect of Wind Power Case-Casting

作　　者：苏艳[1] 张春艳[2] 刘冬梅[2] 薛海涛[1] 金怀东[1] 

机构地区：[1]沈阳机床银丰铸造有限公司,辽宁沈阳110200 [2]沈阳铸造研究所,辽宁沈阳110022

出　　处：《铸造》2010年第9期959-960,963,共3页Foundry

摘　　要：球墨铸铁箱体铸件是风力发电机组中较关键的部件。在下箱体铸件的实际生产中发现因气孔缺陷引起的渗油或漏油造成大量铸件报废。通过对该铸件的铸造工艺进行分析研究,发现造成气孔缺陷的主要原因是因为树脂砂的发气量大,型芯的排气不顺畅所致。通过改进铸造工艺,在型芯中增加排气孔,保证了型芯之间的排气道在浇注过程中和浇注完成后始终畅通,从而基本消除了气孔缺陷。同时,加强生产过程管理,严格执行箱体铸件涂料涂刷的工艺要求和树脂固化剂加入量的规定,对消除气孔也起到关键性作用。Ductile iron case casting is the key part of the wind power generator unit.During the production of lower case,many castings were rejected for the gas hole defect in the surface,which can result in the oil leakage.Analysis and investigation were carried out on the casting technology,and results show that the main reason caused the gas hole is that the exhaust of the core is not smooth,therefore the big gas evolution of resin bonded sand core produced during the casting process can not exhaust quickly.The casting technology was improved through adding gas vent in the core,to insure the exhaust channel between the mould and the core keep smooth during and after the mold filling.After improvement,the gas hole defect is almost eliminated.At the same time strengthening the production process management is also very imporant for production of castings with high quality.

关 键 词：风电铸件 气孔缺陷 球墨铸铁 

分 类 号：TG245[金属学及工艺—铸造]