| 摘要 |
PURPOSE:To enable the stable casting for long time by a small diameter nozzle by making the thickness of the nozzle main body specified times the inner diameter and by arranging an intermediate layer between the reinforcing member wrapping the nozzle main body and the nozzle main body. CONSTITUTION:The nozzle main body 1 is composed of the refractory resistant to a molten metal and the thickness thereof is taken <=0.4 times the inner diameter. The outer diameter is reinforced by a reinforcing member 3 and the space between the nozzle main body 1 and reinforcing member 3 is made the three layer construction of fire resisting insulation arranging the intermediate layer 2 which absorbs the thermal expansion difference among each layer. The heat loss from the molten metal flow to the nozzle inner wall is reduced, the nozzle choking is prevented and the breakdown due to the thermal stress by reducing the difference in the inner and outer temps. of the nozzle main body 1. |
