覆砂铁型铸造气缸体气孔缺陷的防止措施.pdfVIP

覆砂铁型铸造气缸体气孑L缺陷的防止措施 颜文秀 (广西玉柴机器配件制造有限公司，广西玉林537000) 摘要：分析了采用覆砂铁型工艺生产4缸气缸体产生气孔缺陷的原因，认为该缺陷属于侵入性气孑L，采取以下改进措 施：(1)在铁型清理工位和射砂工位之间增加一道铁型加热工序，以提高铁型温度；(2)使用角形系数较小、偏中性的再 生砂代替角形系数较大、偏碱性的擦洗砂，以降低砂芯的树脂加入量；(3)改进浇注操作，提高铁液压力头，增大内浇道 厚度2mm，从而提高浇注时铁液流速。生产结果显示：气孔废品率由原来的11．31％降至0．45％。 关键词：覆砂铁型；4缸气缸体；灰铸铁；气孔 中图分类号：TG250．6 文献标识码：B 文章编号：1003—8345(2017)02—0080—03 DOI：10．3969／j．issn．1003—8345．2017．02．014 Iron Block DefectsPreventionMeasuresofSandCoated Porosity TypeCylinderCasting YANWen—xiu Yuchai PaNs Co．，Ltd．，Yulin537000，China) (GuangxiMachineryManufacturing Abstract：Thereasonsof defectsonsandcoatediron 4 block were wasbelievedthat porosity cylinder analyzed．It type casting thedefectswereresultofinvasive measuresweretakento asandiron pores．Thefollowing improve：(1)Increasetypeheating betweeniron-basedstationand stationto the oftheiron order raise toreduce step clean-up shooting temperaturetype．(2)In theamountof small sand resin，use neutralreclaimedinsteadof angularcoefficient，partiM angular larger scrub the ironhead thethicknessoftheinnerrunner castingoperations，improve sand．(3)Improve liquid pressure，increasing 2mminorderto theflowrateofthe castiron．Productionresults rate by increasing liquid showed：porosityscrap