PURPOSE: To execute continuous casting with prevention of bulging by inserting an inner wall mold having multiple pipe construction into a mold, water-cooling the mold through a gap at outer circumferential side of the multiple pipes and supplying the spray water in the internal pipe part to cool the inner face of hollow bloom.
CONSTITUTION: The inner wall mold 2 having multiple pipe construction is inserted in the mold 1 and in the outer circumferential gap part 3, the cooling water flowing to the drainage hole 6 from a supplying hole 5 through a partition plate 4, is passed through to cool the mold 2. And, in the inner pipe part of mold 2, a spray piping 8 communicating to a main pipe 7 is inserted and the inner face of hollow bloom is cooled by plural spraying nozzles 9 at the tip part of piping 8. Thus, the molten metal is cooled from both faces of the mold 1 and the inner wall mold 2, to form the solidified shells 14a, 14b at each face. Further, the steam generated from the spraying water is exhausted from draft hole 12 of a dummy bar 10 and exhaust duct 13 of the mold 2. In this way, the continuous casting with prevention of bulging is executed.
KAWAI ATSUSHI
KASAMA AKIO
