云溪环保型砂用于砂型铸造,能有效减少铸件的粘砂、夹砂、砂眼、气孔等缺陷,提高铸件的内在和外表质量;同时具备绿色环保、循环应用、优质高效的综合优势。通过系统的测试研究云溪环保型砂的湿压强度、透气性、热湿拉强度、发气性、高温热膨胀性能、高温热压强度,以及高温形态和示差扫描量热-热重分析(Differential scanning calorimetry- Thermogravimetric analysis, DSC-TG)曲线,并和传统的煤粉湿型砂进行对比,进一步认识云溪环保型砂的特点,进一步认识型砂性能对铸件缺陷和铸件质量的影响。研究表明,云溪环保型砂与煤粉湿型砂的湿压强度、透气性、高温热膨胀性能基本相似,而云溪环保型砂的热湿拉强度、高温热压强度、发气性等性能远远优于煤粉湿型砂,这些性能优势能有效减少铸件缺陷,保证铸件质量。研究工作对进一步提高铸件的品质和推行云溪环保型砂这一绿色环保铸造生产工艺具有基础性的指导作用。
YunXi environment friendly molding sand has been successfully used in sand casting process, it can effectively reduce burning-on, scab, sand inclusion, blowhole and other defects. It helps to improve the internal quality and visual quality of casting. YunXi environment friendly molding sand casting process has comprehensive advantages of environment friendly, economic, high-quality and high-efficient. A series of experiments are carried out, which helps to further understand the characteristics of YunXi environment friendly molding sand and the effects of molding sand performance on the casting defects and casting quality. The wet compressive strength, permeability, hot wet tensile strength, gas evolution, thermal expansion, hot pressing strength, high temperature form transformation, differential scanning calorimetry-Thermogravimetric analysis(DSC-TG) curve of YunXi environment friendly molding sand are systematically studied, and which are compared with that of the conventional coal sand. The result shows that the wet compressive strength, permeability, thermal expansion of YunXi environment friendly molding sand are similar with coal sand, but the hot wet tensile strength, hot pressing strength, gas evolution of YunXi environment friendly molding sand are far superior to that of coal sand. These advantages can effectively reduce the casting defects, and ensure the quality of the casting. Research work can helps to further improve the casting quality and further promote the production process of green casting.
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