对熔模铸造现行制壳工艺改进和讨论.pdf

学兔兔 Jan．2O12 · 40 · VO1．61 NO．1 对熔模铸造现行制壳工艺的改进和讨论 黄炳荣 ，景宗梁 (1．无锡鹰普精密铸造有限公司，江苏无锡214028；2．郑州大禹化工产品有限公司，江苏无锡214035) 摘要：中温模料硅溶胶制壳工艺是目前国内外用于精密铸件生产的主流工艺。然而此工艺的制壳生产周期长，而且存 在因面层型壳缺陷导致铸件缺陷的问题。采用了面层浆料加入防裂剂、面层大风力干燥、面层采用大粒径硅溶胶、取 消涂二层前预湿、取消涂面层前沾硅溶胶的工艺举措。结果表明，面层型壳的强度得到了提高，面层型壳的缺陷减少， 涂层干燥时间缩短，铸件一次性合格率增大。 关键词：防裂剂；干燥时间；预湿；胶粒径 中图分类号：TG249．5 文献标识码：A 文章编号：1001—4977(2012)01—0040—03 I m provement and Discussion on Current Shell Moulding Technology of I nvestment Casting HUANG Bing—rong ，JING Zong—liang。 (1．Wuxi Impro Precision Casting Co．，Ltd．，Wuxi 214028，Jiangsu，China； 2．Zhengzhou Dayu Chemical Products Co．，Ltd．，Wuxi 2 14035，Jiangsu，China) Abstract：Silicon sol shell moulding technology with medium-temperature paRem material is the main technology iI1 production of investment castings at home and abroad．However．production cycle of this technology is too long．and casting defects often Occur due to the surface defects of shell mold．Some measures were adopted，such as adding anti—cracking agent to the surface slurry，drying the surface layer by strong wind，using big size colloidal particle in surface slurry，cancelling the prewetting before coating second layer．cancelling coating of the silicon sol before the surface coating．The results show that the surface strength of shell mold is increased，defects on the surface of shell mold are decreased，drying time of coating is shortened，and the qualified rate ofthe castings is increased． Key words：anti—cracking agent；