EP0369184A2 - Machine de coulée ayant un assemblage pour une lingotière mobile - Google Patents

Machine de coulée ayant un assemblage pour une lingotière mobile Download PDF

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Publication number
EP0369184A2
EP0369184A2 EP89119431A EP89119431A EP0369184A2 EP 0369184 A2 EP0369184 A2 EP 0369184A2 EP 89119431 A EP89119431 A EP 89119431A EP 89119431 A EP89119431 A EP 89119431A EP 0369184 A2 EP0369184 A2 EP 0369184A2
Authority
EP
European Patent Office
Prior art keywords
block mold
grooves
casting machine
mold members
casting
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Withdrawn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
EP89119431A
Other languages
German (de)
English (en)
Other versions
EP0369184A3 (fr
Inventor
Masayuki Patent & License Dept. Nakada
Masami Patent & License Dept. Komatsu
Hideto Patent & License Dept. Takasugi
Yoshihiko Patent & License Dept. Kawai
Akichika Patent & License Dept. Ozeki
Shiro Osada
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.)
IHI Corp
JFE Engineering Corp
Original Assignee
IHI Corp
NKK Corp
Nippon Kokan Ltd
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 IHI Corp, NKK Corp, Nippon Kokan Ltd filed Critical IHI Corp
Publication of EP0369184A2 publication Critical patent/EP0369184A2/fr
Publication of EP0369184A3 publication Critical patent/EP0369184A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C11/00—Moulding machines characterised by the relative arrangement of the parts of same
    • B22C11/12—Moulding machines able to travel
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/0657—Caterpillars
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0608—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by caterpillars

Definitions

  • the present invention relates to a casting machine having a pair of travelling block mold assembly capable of continuously casting a thin plate product at high speed.
  • the so-called block casting method of carrying out continuous casting while travelling in the casting direction an assembly which comprises block mold members endlessly connected to one another has appeared these days.
  • This block casting method is intended to cast thin products continuously and at high speed and it attracts attention as a continuous casting method which will become prevailing in the future.
  • the product in the process of solidification is forcedly pulled out of the stationary mold. Therefore, they are broken because of their shells bonded by walls of the stationary mold. This is the so-called "sticker type breakout".
  • the sticker type breakout can be effectively avoided because molding blocks can be drived in response to the speed at which the product in the mold is solidified. According to the block casting method, therefore, casting speed can be made ten times or higher than that of the conventional continuous casting machine having the stationary mold.
  • a block type casting machine for casting thin products each having a thickness of several tens millimeters, for example, is provided with a pair of travelling block units (block mold assembly).
  • Each of these paired travelling block units comprises a plurality of block mold members each having L-shaped section and endlessly connected to one another, and both of these units are travelled synchronously with each other.
  • Casting cavity is defined by a plurality of the block mold members.
  • the object of the present invention is to provide a casting machine capable of preventing flaws such as the transversal and longitudinal cracks at the surfaces of the cast products. It is particularly to provide a casting machine capable of preventing from the surface flaws on the products in the case where the products for thin plates are continuously cast at high speed.
  • a casting machine comprising; at least a pair of tra­velling mold assemblies, each having a plurality of block mold members endlessly connected to one another to define a cavity and a means for driving the block mold members such that the block mold members of one travelling block mold assembly move in synchronism with those of the other in a casting direction, wherein grooves are formed in the shape of a latticed on at least inner walls of the block mold members.
  • the cavity defined by the block mold members may have any sectional shape such as the slender rectangle, slender ellipse, triangle, hexagon, and octagon. Whatever sectional shape the cavity may have, however, it is preferable to form the lattice of grooves at the wide face of the mold wall.
  • each of the grooves formed on the mold wall is small in depth and width. It is more preferable that each of the grooves has a depth D of 0.5 mm and a width W of 0.5 - 1.0 mm.
  • the pitch interval L of the latticed grooves is 5 - 10 mm.
  • the groove pitch L is smaller than 5 mm, contact between the molten steel and the casting walls of the block mold members becomes incomplete. As the result, the molten steel is not cooled enough to thereby increase the frequency of so called breakout.
  • the groove pitch L is larger than 10 mm, however, the merit of preventing the transversal and longitudinal cracks cannot be found. These are the reasons why the groove pitch L is kept 5 - 10 mm.
  • tundish 10 is located on the upstream side of block type continuous casting machine 20 and nozzle 14 of tundish 10 through which molten steel is fed is inserted into the upstream side of a cavity 27 of casting machine 20.
  • cavity 27 is defined by block mold assembly 22 of paired upper and lower casting units 21.
  • Plural spray nozzles 32 and pinch rollers are located on the downstream side of casting machine 20. Casting machine 20 is tilted by a certain angle.
  • Casting machine 20 includes the paired casting units 21 combined to face each other.
  • Each of block mold assembly 22 comprises a plurality of block mold members 23, substantially the same in shape, endlessly connected to one another between a pair of gear wheels 28 and 29 and these members 23 of each of assembly 22 are endlessly driven from upstream to downstream, or from downstream to upstream by a drive mechanism (not shown).
  • Speeds "a” and "b” at which upper and lower block mold assemblies 22 are driven and speed c at which product 31 is pulled out of cavity 27 are computer-­controlled in response to the volume of the molten steel fed and the change of the molten surface in the cavity 27.
  • each of block mold members 23 has an L-shaped section in a direction perpendicular to the casting direction and it is provided with a lattice of grooves 25 formed all over its wider inner wall 24a.
  • grooves 25 extend along seam 3 of adjacent block mold members 23 connected and from one end to the other end of wider inner wall 24a. They also extend in a direction perpendicular to the wider inner wall 24a of member 23.
  • Grooves 25 may be formed on a narrower inner wall 24b of block mold member 23 in addition to wider inner wall 24a thereof. Or they may be formed on a part of wider inner wall 24a, that is, only that portion of wall 24a which is adjacent to seam 3 of mem­bers 23 connected.
  • each of latticed grooves 25 has a V-shaped section whose depth D is smaller than its width W.
  • groove width W is 0.5 - 1.0 mm
  • groove depth smaller than 0.5 mm and groove pitch (distance between adjacent grooves) L 5 - 10 mm.
  • the sectional shape of the groove may be changed to saw-tooth-shaped groove 34, U-shaped groove 35 or rectangular shaped groove 36.
  • Molten steel 12 adjusted to have certain components and a certain temperature is transferred from a ladle (not shown) to tundish 10.
  • Molten steel 12 thus trans­ferred into tundish 10 is fed into cavity 27, into which a dummy bar (not shown) is inserted, through nozzle 14.
  • the cavity 27 is previously under the atmosphere of inert gas and casting is carried out, feeding the molten steel 12 into the cavity 27 while pulling the dummy bar out of the cavity 27 and keeping the front end of nozzle 14 separated from the molten surface in the cavity 27.
  • This so-called “open casting method” may be carried out or the so-called “closed casting method” which is carried out keeping the front end of nozzle 14 immersed in the molten steel 12 in the cavity 27 may be employed.
  • the feeding volume of the molten steel is pre­cisely adjusted by a sensor and a controller (not shown) located on the side of the tundish 10 to best control both of the speed "a" and "b" at which each of casting units 21 is endlessly driven and the speed "c" at which the product 31 is pulled out of the cavity 27.
  • molten steel 12 When molten steel 12 is fed into cavity 27 through nozzle 14, it contacts the casting walls of water-cooled block members 23 which define cavity 27 and becomes shell 26, which is further cooled by spraying water through spray nozzles 32 and solidified completely. Casting speed is more than 20 meters per minute, for example.
  • Cooling deficiencies are caused at seams 3 and grooves 25 during solidifcation of molten steel in the mold. Solidification delays are thus caused and tensile stress (contraction stress) is created at these specific areas when the molten steel is solidified and shrunk. Because the contraction stress is scattered on all of the surface of the shell 26, however, the concentration of the contraction stress can be reduced to some extent.
  • Shell 26 is developed to have a sufficient thickness and a certain strength at the outlet of the mold.
  • the solidification of product 31 is controlled by water jetted through spray nozzles 32, during pulling shell 26 out of the mold.
  • a thin slab 50 mm thick and 1000 mm wide, is produced in this manner.
  • Fig. 9 is a graph, on the horizontal axis of which groove pitch L of the V-shaped grooves is plotted and on the vertical axis of which the frequency of cracks caused in products and the index of breakout occurrence are plotted to explain the quality of slab 31 changing the groove pitch L variously but keeping other con­ditions substantially the same.
  • black spots represent transversal cracks
  • white spots repre­sent longitudinal cracks
  • white triangles represent breakout occurrence.
  • the index of breakout occurrence means in this case that frequencies of breakout caused in products are replaced by indexes.
  • the frequency of transversal and longitudinal cracks caused in products is quickly increased when groove pitch L becomes longer than 10 mm.
  • groove pitch L is shorter than 5 mm, the index of breakout occurrence is increased because contact between the molten steel in the cavity and the inner walls of the block mold members becomes insufficient and the molten steel is not cooled enough, accordingly.
  • groove pitch L is in a range of 5 - 10 mm.
  • each of the latticed grooves formed on the inner walls of the block mold members in the cavity has the V-shaped section in the above-described embodiment, it may be like saw-tooth-shaped groove 34, U-shaped groove 35 or rectangular-shaped groove 36, as shown in Figs. 6 through 8.
  • the latticed grooves have been formed only on the wider inner wall 24a of each of the block mold members 23 in the cavity in the case of the above-­described embodiment, they may be formed on the narrower inner wall 24b of each of the block mold members 23, or on a part of the wider inner wall 24a, or adjacent to the seams along which the block mold members 23 are connected to one another.
  • the occurrence of transversal and longitudinal cracks on surface of slab 31 can be effectively prevented.
  • After-treatments e.g. surface treatment etc.
  • the productivity of products can be therefore enhanced and their manufacturing cost can be made lower.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP19890119431 1988-10-19 1989-10-19 Machine de coulée ayant un assemblage pour une lingotière mobile Withdrawn EP0369184A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP261463/88 1988-10-19
JP63261463A JPH02108442A (ja) 1988-10-19 1988-10-19 ブロック式移動鋳型

Publications (2)

Publication Number Publication Date
EP0369184A2 true EP0369184A2 (fr) 1990-05-23
EP0369184A3 EP0369184A3 (fr) 1991-11-21

Family

ID=17362247

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890119431 Withdrawn EP0369184A3 (fr) 1988-10-19 1989-10-19 Machine de coulée ayant un assemblage pour une lingotière mobile

Country Status (5)

Country Link
EP (1) EP0369184A3 (fr)
JP (1) JPH02108442A (fr)
KR (1) KR900006043A (fr)
BR (1) BR8905304A (fr)
CA (1) CA2000618A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2034217A (en) * 1978-11-03 1980-06-04 Alusuisse Moulds with Roughened Surface for Casting Metals
EP0237318A2 (fr) * 1986-03-10 1987-09-16 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Moule pour installation de coulée continue à bande sans fin à chenilles
JPS63132751A (ja) * 1986-11-25 1988-06-04 Nkk Corp 連続鋳造装置用鋳型
JPH06254556A (ja) * 1993-03-01 1994-09-13 Brother Ind Ltd イオン水生成装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63174762A (ja) * 1987-01-12 1988-07-19 Nkk Corp 連続鋳造用移動式鋳型

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2034217A (en) * 1978-11-03 1980-06-04 Alusuisse Moulds with Roughened Surface for Casting Metals
EP0237318A2 (fr) * 1986-03-10 1987-09-16 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Moule pour installation de coulée continue à bande sans fin à chenilles
JPS63132751A (ja) * 1986-11-25 1988-06-04 Nkk Corp 連続鋳造装置用鋳型
JPH06254556A (ja) * 1993-03-01 1994-09-13 Brother Ind Ltd イオン水生成装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 241 (M-614)(2688), 7 August 1987; & JP - A - 6254556 (ISHIKAWAJAMA) 10.03.87 *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 381 (M-752)(3228), 12 October 1988; & JP - A - 63132751 (NIPPON KOKAN) 04.06.1988 *

Also Published As

Publication number Publication date
JPH0470107B2 (fr) 1992-11-10
BR8905304A (pt) 1990-05-22
CA2000618A1 (fr) 1990-04-19
JPH02108442A (ja) 1990-04-20
EP0369184A3 (fr) 1991-11-21
KR900006043A (ko) 1990-05-07

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