采煤机摇臂铸件缺陷分析及防止措施.pdfVIP

学兔兔 铸 造 May2012 · 530· FOUNDRY VoI．61 No．5 采煤机摇臂铸件缺陷分析及防止措施 陆亦3- ，岳先才 ，曹 文。 (1．新疆工程学院，新疆乌鲁木齐830091；2．无锡市铸造有限公司，江苏无锡214115： 3．中国联合工程公司，浙江杭州310022) 摘要：为解决采煤机摇臂铸造生产中出现的铸造缺陷，对铸件的结构特点进行了分析，并运用顺序凝固理论，设计浇冒 系统及内外冷铁的安放位置。采取提高砂芯的退让性、制定合理的浇注工艺等项措施。结果表明：铸件内形成了顺序凝 固的温度梯度，缩孔、缩松、裂纹、夹渣、气孑L等缺陷得到有效防止；经机加工和探伤等检验，产品满足技术要求。 关键词：采煤机摇臂；铸件缺陷；凝固理论 中图分类号：TG250．6 文献标识码：A 文章编号：1001—4977(2012)05—0530—03 Shearer Rocker Arm Casting Defect Analysis and Its Preventive Measures LU Yi—gong ，YUE Xian-cai ，CAO Wen (1．XinjiangInstitute ofEngineering,Urumqi 830091，X iang，China；2．WuxiFoundryCo．，Ltd．，Wuxi214115，Jiangsu，China； 3．China United Engineering Corporation，Hangzhou 3 10022，Zhejiang，China) Abstract：The structural characteristics of shearer arln were analyzed，and gating and riser system and the position of the chills were designed by using of solidification theory for solving the casting defects of shearer arllq production．The measures were adopted，such as increasing the deformability of sand core and establishing of reasonable pouring process，etc．The results show that the temperature gradient beneficial to sequential solidification was established，and shrinkage，dispersed shrinkage，cracks，slag inclusion，gas hole and other defects were effectively prevented；through machining，flaw detection，and other check tests。the castings meet the technical requirements． Key words：shearer rocker arm；casting defect；solidification theory 采煤机摇臂材质一般为铸钢ZG270．500、 表1 铸件化学成分 ZG25Mn。不同型号的尺寸大小不一，但基本结构