EP0509941A1 - Verfahren und Vorrichtung zum frühzeitigen Erkennen von Fehlern, die das Giessen von Metall beeinflussen - Google Patents

Verfahren und Vorrichtung zum frühzeitigen Erkennen von Fehlern, die das Giessen von Metall beeinflussen Download PDF

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Publication number
EP0509941A1
EP0509941A1 EP92420124A EP92420124A EP0509941A1 EP 0509941 A1 EP0509941 A1 EP 0509941A1 EP 92420124 A EP92420124 A EP 92420124A EP 92420124 A EP92420124 A EP 92420124A EP 0509941 A1 EP0509941 A1 EP 0509941A1
Authority
EP
European Patent Office
Prior art keywords
meniscus
shape
order
image
mold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP92420124A
Other languages
English (en)
French (fr)
Inventor
Benoît Dupuich
Patrick Simonnin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
D'etudes Et De Realisations Techniques Sert Ste
Original Assignee
D'etudes Et De Realisations Techniques Sert Ste
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by D'etudes Et De Realisations Techniques Sert Ste filed Critical D'etudes Et De Realisations Techniques Sert Ste
Publication of EP0509941A1 publication Critical patent/EP0509941A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations

Definitions

  • the present invention relates to installations for casting a liquid metal for the production of metal bars or bars by the continuous or semi-continuous casting processes.
  • installations of this kind generally comprise a series of molds or ingot molds which are oriented vertically and inside which is poured, at an appropriate flow rate, the molten metal.
  • This metal gradually solidifies on contact with the interior wall, suitably lubricated, of each mold or ingot mold, thereby making it possible to obtain a bar or bar which is discharged downward either continuously or cyclically.
  • a number of faults are likely to appear during the casting process. It is relatively common for the surface or "skin” of metal bars or bars to have more or less accentuated deformations, which localized deformations affect the calibration of the products obtained. It may also be the phenomenon known as "breakthrough", the metal not yet solidified flowing laterally out of the already solidified bar, at the bottom of the mold or ingot mold.
  • thermocouples housed in the wall of the molds or ingot molds thus being able to reveal the appearance of a significant change in the temperature of the upper part. liquid from the cast metal.
  • the present invention intends in particular to provide a solution, and this using the preventive detection method and apparatus which are respectively defined in claims 1 and 3 and which are capable of being implemented. regardless of the thickness and nature of the solidification molds or molds.
  • the invention essentially consists in permanently taking the optical image from the separation meniscus between the liquid metal and at least one area of the interior wall of the mold or ingot mold, then scanning the image thus detected in order to determine by calculate the exact shape of this meniscus of separation, and finally analyze this shape in order to determine its characteristics.
  • the reference 1 designates an ingot mold of the usual type, which will be assumed to be established with a circular profile in section.
  • This ingot mold 1 (shown in axial section in the drawing) is associated with a pipe 2 for supplying an appropriate lubricant capable of coating the inner wall of said ingot mold, the flow rate of this lubricant being provided adjustable.
  • a ladle is intended to pour into the mold 1, also at an adjustable rate, the molten metal which in the upper part of said mold forms a liquid mass 3, which gradually solidifies on contact with the lubricated inner wall.
  • a solidified bar 4 is obtained which is discharged from below, for example using a drive system shown diagrammatically in the form of lateral rollers 5.
  • the apparatus which is intended, according to the invention, to preventively detect faults liable to affect the casting process, firstly incorporates an information sensor 6 which is oriented obliquely in the direction of an area of the upper outlet of the ingot mold 1.
  • This sensor 6 comprises, in the manner known per se, an optical system 6 a behind which is disposed a photosensitive element 6 b , so that when the apparatus is in operation, it appears permanently on the screen of the control monitor 6 c an image representing in 1 ′ the internal wall of the ingot mold 1, in 3 ′ the upper level of the liquid mass 3 of the molten metal, and in M the meniscal line separating the liquid metal and the wall.
  • the image thus detected by the sensor 6 is transmitted to an electronic converter 7 which transforms the signals which constitute said image into a set of digital values; these in fact represent the X and Y coordinates of each of the points which form the image received from the sensor 6, as well as the level of brightness of each of said points.
  • this computer 8 contains in memory the theoretical line which the meniscus must affect to avoid any appearance of defects, so that it is able to compare with this theoretical line the series of points constituting the meniscus M and calculating the differences in amplitude, frequency or coloring between the two lines present.
  • the deviation values obtained at the computer 8 can be sent either to a screen in order to be displayed for reading by qualified personnel to intervene and avoid the formation of faults, or to an automaton capable of performing this itself. correction work.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
EP92420124A 1991-04-16 1992-04-15 Verfahren und Vorrichtung zum frühzeitigen Erkennen von Fehlern, die das Giessen von Metall beeinflussen Withdrawn EP0509941A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9104903A FR2675410A1 (fr) 1991-04-16 1991-04-16 Procede et appareillage pour la detection preventive des defauts susceptibles d'affecter la coulee d'un metal liquide.
FR9104903 1991-04-16

Publications (1)

Publication Number Publication Date
EP0509941A1 true EP0509941A1 (de) 1992-10-21

Family

ID=9412093

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92420124A Withdrawn EP0509941A1 (de) 1991-04-16 1992-04-15 Verfahren und Vorrichtung zum frühzeitigen Erkennen von Fehlern, die das Giessen von Metall beeinflussen

Country Status (2)

Country Link
EP (1) EP0509941A1 (de)
FR (1) FR2675410A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102566608A (zh) * 2011-12-13 2012-07-11 江西稀有稀土金属钨业集团有限公司 基于视觉的铸轮液位自动控制系统与控制方法
CN103402672A (zh) * 2011-03-31 2013-11-20 古河电气工业株式会社 金属铸块制造方法、液面控制方法、极细铜合金线

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5725270A (en) * 1980-07-21 1982-02-10 Nippon Steel Metal Prod Co Ltd Molten metal level detector for powder feeder
JPS5747562A (en) * 1980-09-05 1982-03-18 Kyoei Seikou Kk Method for automatic observation of melt surface in mold in continuous casting method
JPS61293640A (ja) * 1985-06-24 1986-12-24 Mitsubishi Heavy Ind Ltd パウダ−投入量制御装置
JPH0299255A (ja) * 1988-05-16 1990-04-11 Nippon Steel Corp 薄肉鋼板用の連続鋳造機の湯面制御装置

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 160 (M-592)(2607) 23 Mai 1987 & JP-A-61 293 640 ( MITSUBISHI HEAVY IND. LTD. ) 24 Décembre 1986 *
PATENT ABSTRACTS OF JAPAN vol. 14, no. 305 (M-992)(4248) 29 Juin 1990 & JP-A-2 099 255 ( NIPPON STEEL CORP. ) 11 Avril 1990 *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 120 (M-140)(998) 3 Juillet 1982 & JP-A-57 047 562 ( KIYOUEI SEIKOU K.K. ) 18 Mars 1982 *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 89 (M-132)(967) 27 Mai 1982 & JP-A-57 025 270 ( NITSUTETSU KINZOKU KOGYO K.K. ) 10 Février 1982 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103402672A (zh) * 2011-03-31 2013-11-20 古河电气工业株式会社 金属铸块制造方法、液面控制方法、极细铜合金线
CN103402672B (zh) * 2011-03-31 2015-08-12 古河电气工业株式会社 金属铸块制造方法、液面控制方法、极细铜合金线
CN102566608A (zh) * 2011-12-13 2012-07-11 江西稀有稀土金属钨业集团有限公司 基于视觉的铸轮液位自动控制系统与控制方法
CN104950929A (zh) * 2011-12-13 2015-09-30 江西稀有稀土金属钨业集团有限公司 基于视觉的铸轮液位自动控制系统与控制方法

Also Published As

Publication number Publication date
FR2675410A1 (fr) 1992-10-23

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