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通过对硅溶胶型壳冷却特点分析,利用水力学公式,推导出充型时钢液和内浇道型壁热交换时间与通过内浇道的钢液质量成正比,对内浇道附近金属液的流动过程和缩孔的产生带来影响。提出用质量流密度来校核内浇道面积的大小、数量,质量流密度小于0.4×104kg/m2的内浇道是安全的。介绍了质量流密度在热冒口、阶梯式、底注式、多内浇道、复合式浇注系统以及平衡浇注、铸件热流道中的应用。该方法能有效解决内浇道、流道过热中的缩孔问题。由于内浇道质量流密度考虑了铸件质量,不会因铸件质量大而热节尺寸小、内浇道总面积小,导致模组在淋砂时出现掉件现象。
Through the analysis of the cooling characteristics of the silica sol shell, using the formula of hydraulics, it is deduced that the heat exchange time between the molten steel and the inner wall of the runner is proportional to the mass of the molten steel passing through the gate, The flow process and the impact of shrinkage. It is safe to use the mass flow density to check the size, quantity and mass flow density of the runner area less than 0.4 × 104kg / m2. The application of mass flow density in hot runner, step type, bottom type, multiple gate, compound type pouring system and balanced casting and hot runner of casting is introduced. The method can effectively solve the problems of shrinkage cavity in the runner and the overheated runner. Due to the mass flow density of the ingate, the quality of the castings is taken into consideration. The small size of the hot section and the small total area of the runners will not result in the die dropping when the module is drenched.