Patent ID: 6321829
Filing Date: 2001-11-27
Classification: B22D

Abstract:
A billet continuous casting method, comprising:providing a water-cooled tubular mold having notched portions at corners of a lower part of the mold;providing a molten metal level detecting unit that outputs a molten metal level signal indicative of a level of molten metal in the mold;pouring molten metal into the mold;starting casting while applying electromagnetic brakes to the poured molten metal flow in the mold;decreasing drawing speed of cast piece by pinch rolls when the molten metal level signal has fallen short of a predetermined value range of the level in the mold;increasing the drawing speed of cast piece when the molten metal level signal has exceeded the predetermined value range of the level in the mold; andelastically imparting a pushing force corresponding to static pressure of the molten metal to unnotched portions at the lower part of the mold in an inward direction of the mold, whereby the molten metal is continuously poured into the mold to solidify the molten metal so that a cast piece quadrangular in cross section is continuously produced.