湿砂型冷芯铸造缸体的缺陷分析及对策  

Defects Analysis and Countermeasures of Cylinder Blocks Cast with Green Sand Mould and Cold-Box Cores

作　　者：王艳辉 

机构地区：[1]一汽铸造有限公司铸造二厂,吉林长春130011

出　　处：《现代铸铁》2013年第5期59-66,共8页Modern Cast Iron

摘　　要：对大众系列发动机缸体开发过程中遇到的铸造缺陷进行了原因分析,并提出了相应的解决措施:(1)解决水套内腔局部断芯的措施有:使用特种砂替代硅砂、改进水套砂芯涂料工艺、严格控制原材料工艺参数、保证砂芯具有足够强度;(2)解决缸体顶面水套外壁夹砂的措施有:应用天然钠土替代部分人工活化土、缩短水套外壁受热辐射时间、减少砂芯发气量、增强铸型排气效率;(3)解决缸体外表面粘砂的措施有:细化型砂粒度、增加砂型孔隙阻力,增加砂型气体背压、阻止金属液侵入砂型孔隙,控制旧砂温度与水分、减少铸件热粘砂,优化型砂参数,等。The reasons causing the casting defects occurring during the development process of Volkswagen series cylinder blocks were analyzed and their relevant solving measurers were proposed as follows：（ 1 ）The measures to prevent local fracture of jacket core include：using special sand as the substitute for the silica sand, improving coating process of cores, strictly controlling process parameters of raw materials and ensure the cores having sufficient strength; （2）The measures to prevent scab defect on the outer wall of jacket,i.e, on the top surface of block,include：using natural natrium clay as the substitute for a part of artificially-activated clay, shorting the duration the outer wall of the jacket core suffering hot-radiation, reducing gas evolution of the core sand and increasing venting efficiency; （3）The measures to avoid metal penetration occurring on the outer surface of the cylinder block include：decreasing sand granularity, increasing the resistance of the gaps between sand particles,increasing the gas back-pressure of the sand mold to prevent metal liquid penetrating into sand-gaps,controlling temperature and moisture of the sand to reduce hot burning-on defects of the casting, optimizing parameters of the molding sand,etc.

关 键 词：湿砂型 冷芯 缸体 缺陷 对策 

分 类 号：TG250.6[金属学及工艺—铸造]