基于多材质复合铸型的铸铁件铸造工艺数值模拟与试验研究  

Numerical Simulation and Experimental Research on Multi-Material Hybrid Sand-Mold Process of Iron Castings

作　　者：刘丽敏 单忠德 刘丰 张帅 LIU Li-min;SHAN Zhong-de;LIU Feng;ZHANG Shuai(State Key Laboratory of Advanced Forming Technology and Equipment,China Academy of Machinery Science ＆ Technology Group Co.,Ltd.,Beijing 100083,China)

机构地区：[1]机械科学研究总院集团有限公司先进成形技术与装备国家重点实验室,北京100083

出　　处：《铸造》2018年第11期955-960,共6页Foundry

基　　金：国家杰出青年科学基金(51525503);青年拔尖人才计划(W02070184)

摘　　要：评定了四种铸造常用型砂的蓄热系数,然后选取不同壁厚方形筒件为典型件,开展其传统铸造工艺的单一铸型和基于无模铸造复合成形技术的多材质复合铸型工艺的方案设计,对两种工艺分别进行了有限元数值模拟与试验研究。结果表明:多材质复合铸型工艺所得铸件四周200 s以后几乎实现同时凝固,铸件四周的石墨形态均为A型,长度为100μm左右,差异较小,且分布均匀;铸件四周的抗拉强度差值最小约3.7%,且抗拉强度值最大提升20.9%。该研究成果可为复杂铸铁件高性能、高质量铸造提供技术参考。Heat storage coefficients of four kinds of molding sands have been evaluated. The square tube casting with different wall thickness was selected as the typical part; its sand-mold made with single molding sand based on the traditional casting process and the hybrid sand-mold made with multi-material molding sands based on the patternless casting technology have been designed, respectively. And the finite element numerical simulation and experimental research have been conducted for these two casting processes. The results show that the solidification process, with the multi-material hybrid sand-mold, is simultaneous after approximately 200 s for the entire square tube casting. Its graphite morphology is A type with the length of about 100 Ixm, presenting small difference in morphology and evenly distributed in the microstructure of the casting. The difference of tensile strength at different wall thicknesses of the casting is within 3.7%. Furthermore, the maximum increase of tensile strength reaches 20.9%. The research results provide technical reference for the production of high performance and high quality complex iron castings.

关 键 词：无模铸造复合成形技术 多材质复合铸型 凝固时间 石墨形态 抗拉强度 

分 类 号：TG249.2[金属学及工艺—铸造]