镁合金用铸造型砂热物性参数测定与研究

Determination and Study on Thermophysical Parameters of Molding Sand for Magnesium Alloy Casting

通过浇注法得到型砂的温度场,利用反算法求出硅砂、宝珠砂、铬铁矿砂、陶粒砂、钢丸混砂和粘土砂的热导率和比热容,为镁合金铸造模拟提供了重要数据。利用测得的比热容和热导率得到了这些型砂的蓄热系数,通过对几种型砂蓄热系数的比较,得到了常用型砂对铸件激冷能力的大小,与实际生产相符合。

The temperature field of molding sand was obtained using the pouring method, and the thermal conductivity and specific heat capacity of silica sand, ceramsite sand, chromite sand, Taoli sand, steel pellet mixed sand and clay sand were calculated by using inverse algorithm, which could provide important data for simulation of magnesium alloy casting. The heat storage coefficient of the molding sand was obtained by using the measured specific heat capacity and thermal conductivity, and by the comparison of the heat storage coefficients between several kinds of molding sand, the cooling capacity of the common molding sand to the castings was obtained, which was consistent with the actual production.