Patent ID: 8509942
Filing Date: 2013-08-13
Classification: B22D

Abstract:
1. A method for producing metal ingot, which comprises the use of a production apparatus comprising: a mold; a spout that pours a molten metal in a tundish to said mold; a stopper that adjusts an opening of said spout; a camera that records an image of surface of the molten metal within said mold; an analyzing part that analyzes the surface image recorded by said camera; and a controlling part that adjusts the opening of said spout based on information analyzed by said analyzing part; wherein said analyzing part sets an analysis band along a direction of change of said surface on the surface image recorded by said camera, and said analysis band has a predetermined width and includes said surface, binarizes an image within said analysis band to a molten metal part and a non molten metal part, obtains a rate of change of binary data for a longitudinal direction of said analysis band, and identifies the lowest position among the positions where the peak of the calculated rate of change is equal to or above a predetermined standard value as a surface height; and wherein said controlling part adjusts the opening of said spout by comparing said surface height with a standard surface height.