灰铸铁刀闸阀铸件变形问题的解决.pdfVIP

学兔兔 铸 造 Sep．2010 一956· FOUNDRY VoI．59 _N 9 灰铸铁刀闸阀铸件变形问题的解决 杨宝宏 ，顾学明 (1．德国依博罗阀门上海办事处，上海200051；2．常州钜苓铸造有限公司，江苏常州213115) 摘要：刀闸阀铸件结构复杂，壁厚分布不均匀，理论上容易产生热应力变形缺陷；铸件内腔毛坯尺寸公差为CT7，普通 手工树脂砂造型工艺很难满足此公差要求。在采用平作立浇工艺、激冷覆膜砂制芯、控制铁液浇注温度和化学成分等措 施的基础上，研究了铸件收缩量和浇注温度、铸件壁厚的关系。铸件收缩量与浇注温度成反比，与铸件壁厚成正比例关 系。根据研究结果采取针对性改进措施，有效地解决了铸件变形问题，保证铸件内腔尺寸公差满足图纸设计要求。 关键词：刀闸阀；阀体；铸铁件；树脂砂手工造型 中图分类号：TG251文献标识码：B 文章编号：1001—4977(2010)09—0956—03 Solving of Deformation of Grey I ron Knife Gate Valve Body Casting YANG Bao—hong’，GU Xue—ming (1．EBRO ARMATUREN(Be Jjing)Co．，Ltd．，Shanghai office，Shanghai 200051，China； 2．Changzhou Juling Foundry Co．，Ltd．，Changzhou 2131 15，Jiangsu，China) Abstract： Knife gate valve body casting has complicated structure and big difference jn walI thickness．Thermal defolrmation defect jS easy to Occur jn theory．Casting jnside cavity tolerance jS CT7．which iS di仟icult to achieve by normaI resin bonded sand hand molding method．Based on horizontal molding and vertical pouring technology，chilling resin coated sand core making，pouring temperature and chemicaI composition controlling，etc，relationships between casting contraction and pouring temperature＆casting walI thickness were studied．Castings contraction iS in inverse proportion to pouring temperature while direct proportion to walI thickness。The deformation defect was effectively solved according to above conclusion．Casting inside cavity tolerance can meet designng mquitements． Key wo~s：kn}I_e gate valve；valve body；iron casting；resin bonded sand hand molding