| 摘要 |
PURPOSE:To improve quality of billet surface by executing reciprocating motion with closely resemblong sine curve in casting direction for integrated type combination mold, making a max. descendent speed of the mold faster than casting speed of the casting billet and making a return-back length, etc. a speci fied value. CONSTITUTION:The integrated type combination mold, which arranges an inter mediate vessel 2 above a water cooling mold 1, and a heat insulating ring 3 at the boundary of the both, executes reciprocating motion with closely resem bling sine curve in the casting direction, and the max. descendent speed of the mold is faster than the casting speed of the casting billet. Further, the casting is executed under condition of which a negative strip time (tN) and the return-back length (lr) satisfy the inequality. In this way, the casting billet having good surface quality is obtd.
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