刘金水,刘思雨,高文理.覆砂工艺消减铝合金筒形件铸造残余应力的研究[J].湖南大学学报:自然科学版,2017,44(12):1~7
覆砂工艺消减铝合金筒形件铸造残余应力的研究
Research on Reduction of Casting Residual Stress for Aluminum Alloy Cylinder by Coated Sand Casting
  
DOI:
中文关键词:  ZL205A  铁型覆砂  残余应力  有限元模拟
英文关键词:ZL205A  coated sand casting  residual stress  finite element simulation
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作者单位
刘金水,刘思雨,高文理 (湖南大学 材料科学与工程学院湖南 长沙 410082) 
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中文摘要:
      采用钻孔法测试铁型覆砂工艺ZL205A铝合金筒形铸件在不同覆砂厚度下的铸造残余应力,采集各覆砂厚度的凝固冷却曲线,研究覆砂厚度对铸件残余应力及凝固冷却过程的影响;利用Von Mises模型和Mohr-Coulomb模型,进行了覆膜砂铸造有限元仿真.研究结果表明:覆砂工艺能有效减少铸件残余应力.当覆砂厚度达到7 mm时铸件残余应力可以降低约62%;覆砂厚度大于7 mm后,残余应力继续减小幅度减小.通过对覆膜砂铸造过程测得的凝固冷却曲线分析,建立了覆砂厚度与凝固冷却速率、晶粒大小及共晶温度之间的关系,为实际应用提供可靠的工艺参考.仿真结果显示两种模型模拟的计算结果都与实验趋势基本吻合,但同时也需要考虑到不同覆砂厚度下两种模型各自的适用性.
英文摘要:
      In order to study the influence of coated sand thickness on casting residual stress and solidification cooling process,the casting residual stress of ZL205A aluminum alloy cylinder with different sand thickness was measured by drilling method,and the solidification curves were collected.The paper has carried out finite element simulation of coated sand casting processes for ZL205A aluminum alloy specimen by adopting Von Mises mold and Mohr-Coulomb mold.The results show that the residual stress of castings can be reduced by about 62%,when the sand thickness reaches 7 mm.The residual stress changes a little with the sustained increasing of sand thickness.To provide a reliable process reference,the relationship between sand thickness and solidification cooling rate,grain size and eutectic temperature was established by analyzing and comparing the temperature curve measured in coated sand casting process.The simulation results show that the calculated results of the two models are basically consistent with the experimental trend.But we also need to take into account the applicability of the two models under different sand thickness.
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