| 摘要 |
PURPOSE:To form the suitable size of a pouring nozzle by forming a size of downstream side end part for the pouring nozzle to a little larger beforehand, inserting under pressure it at the end of inlet for molten metal and next grinding the downstream side end part of nozzle by a mold supporting material, etc. CONSTITUTION:The pouring nozzle 10 is formed by an inner cylinder 11 having the downstream side end part 11a and composing of refractory with good cutting machinability and a metallic outer cylinder 12. Then, the outer side of downstream side end part 11a for the nozzle is beforehand formed as larger than the inner size of inlet end 13a of molten steel for a shifting type mold 13. Next, the nozzle 10 is inserted under pressure into the inlet end 13a of molten steel, and as shifting thc supporting body 14 of caterpillar, by grinding action of the blocks 14a, the outer size of end part 11 is adjusted, so as not to become to bring the end part 11a into contact with the blocks 14a. Therefore, in this way, the suitable size of downstream side end part 11a for the pouring nozzle 10 is formed. |
