Slag volume evaluation method for molten metal surface

Patent metadata

Field	Value
Publication number	US-10845352-B2
Application number	US-201716466154-A
Country	US
Kind code	B2
Filing date	Dec 6, 2017
Priority date	Dec 6, 2016
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

A slag volume evaluation method for a molten metal surface includes calculating an approximation curve indicating a correspondence between a thickness of slag and a density parameter in advance by measuring thicknesses of a plurality of pieces of the slag which float on a surface of a molten metal in a container and differ from each other in thickness, and calculating a value of the density parameter which is correlated to a density in a pixel region corresponding to the plurality of pieces of the slag in a captured image of a molten metal surface in the container; and calculating a volume of the slag by calculating and integrating the thickness of the slag for each of pixels constituting the captured image obtained by capturing an image of the molten metal surface which is an evaluation target, according to a value of the density parameter of each of the pixels and the approximation curve.

First claim

What is claimed is:

1. A slag volume evaluation method for a molten metal surface, in which a volume of slag floating on a surface of a molten metal contained in a container is evaluated according to a captured image of a molten metal surface in the container, the method comprising:
calculating an approximation curve indicating a correspondence between a thickness of the slag and a density parameter in advance by measuring thicknesses of a plurality of pieces of the slag which float on the surface of the molten metal and differ from each other in thickness, and calculating a value of the density parameter which is correlated to a density in a pixel region corresponding to the plurality of pieces of the slag in the captured image obtained by capturing an image of the molten metal surface in the container in a state where the plurality of pieces of the slag are floating on the surface of the molten metal;
capturing the image of the molten metal surface which is an evaluation target; and
calculating the volume of the slag by calculating the thickness of the slag for each of pixels constituting the captured image obtained through the capturing, and integrating the calculated thickness of the slag for each of the pixels, according to the value of the density parameter of each of the pixels constituting the captured image obtained through the capturing and the approximation curve calculated through the calculating of the approximation curve.

2. The slag volume evaluation method for a molten metal surface according to claim 1 , further comprising:
scraping off the slag from the container; and
calculating a residual ratio of the slag in the container,
wherein in the capturing, images of the molten metal surface in the container before the scraping and the molten metal surface in the container after the scraping are captured,
wherein in the calculating of the volume of the slag, the volume of the slag in the container before the scraping and the volume of the slag in the container after the scraping are calculated, and
wherein in the calculating of the residual ratio of the slag, the residual ratio of the slag in the container is calculated by dividing the volume of the slag in the container after the scraping by the volume of the slag in the container before the scraping.

Assignees

• Nippon Steel Corp
• Nippon Steel Corpoation

Inventors

• Kusunoki Tomoyuki
• Miyazaki Takahiro

Classifications

• F27D2021/026

  using a video installation · CPC title

• F27D21/02

  Observation or illuminating devices · CPC title

• F27D21/00

  Arrangement of monitoring devices; Arrangement of safety devices · CPC title

• B22D2/001

  for the slag appearance in a molten metal stream · CPC title

• B22D43/00

  Mechanical cleaning, e.g. skimming of molten metals · CPC title