The Influence Of Air Gap In Mould Wall Heat Preservation

This topic based on the characteristics of air insulation, the use of a hollow ingot moldwall way to reduce the die wall heat transfer and improve the die wall insulation effect,the ingot solidification process of rational distribution of temperature field, one wayto improve the heat transfer conditions, in order to better to achieve directionalsolidification of liquid steel, thus eliminating lateral solidification defects such asgrain boundaries, access to the columnar grain and single crystal structure andimprove mechanical properties of the material longitudinally. In the experimentalsimulation, measurement ingot mold inner and outer walls and the temperature of theair gap, initially identified by the temperature difference between the inner and outerwalls of the air-gap best. Experiments show that the hollow25mm air gap for thebetter, but the insulation effect is not obvious. In this study, in order to furtherimprove the insulation effect, presented at the outside wall of the ingot mold to25mmas a unit into the heat shield measures for improvement, also determined by thetemperature difference between the inner and outer walls of the flapper better number,and then calculate the equivalent heat transfer at the air gap, and then after aquantitative analysis of the flapper in the air gap insulation effect. Experiments showthat the insertion of a heat shield, the heat reduced by40%～50%range, indicatingthat the insertion of a heat shield can significantly improve the air-gap insulationeffect.