基于热探针法的冷冻砂型导热系数测定与分析

Determination and Analysis of Thermal Conductivity of Frozen Sand Mold Based on Thermal Probe Method

砂型导热系数对铸件性能有着重要的影响,本文对冷冻铸造中冷冻砂型的导热系数进行了研究。采用热探针法对不同含水量的冷冻砂型在不同温度下的导热系数进行了测定,建立冷冻砂型导热系数体积混合法预估模型,揭示了冷冻砂型导热系数与含水量以及温度的关系。试验结果表明,含水量越高,冷冻砂型导热系数越大。在低于0℃的温度环境下冷冻砂型导热系数随温度升高而增大;0℃时冰变水导致导热系数断崖式下降;0℃以上导热系数随温度的升高而升高。本文实现了冷冻砂型导热系数的测定分析,为冷冻砂型铸造更好的应用提供了研究基础.

The thermal conductivity of sand mold has an important effect on the performance of castings.The thermal conductivity of sand mold in frozen casting was studied in this paper.The thermal conductivity of frozen sand mold with different water content at different temperatures was measured by thermal probe method,and the prediction model of thermal conductivity of frozen sand mold with volume mixing method was established.The relationship between thermal conductivity of frozen sand mold and water content and temperature was revealed.The experimental results showed that the higher the water content was,the higher the thermal conductivity of the frozen sand was.When the temperature was below O℃,the thermal conductivity of the frozen sand type increased with the increase of temperature.When the temperature was O℃,the thermal conductivity dropped precipitously due to the change of ice and water.In this paper,the thermal conductivity of frozen sand mold was determined and analyzed,which provided the research basis for the better application of frozen sand mold casting.