WO1998009750A1 - Surface de moule amelioree pour coulee en continu et procede de fabrication associe - Google Patents

Surface de moule amelioree pour coulee en continu et procede de fabrication associe Download PDF

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Publication number
WO1998009750A1
WO1998009750A1 PCT/US1997/014847 US9714847W WO9809750A1 WO 1998009750 A1 WO1998009750 A1 WO 1998009750A1 US 9714847 W US9714847 W US 9714847W WO 9809750 A1 WO9809750 A1 WO 9809750A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
coating
liner
compressively stressed
continuous casting
Prior art date
Application number
PCT/US1997/014847
Other languages
English (en)
Inventor
James B. Sears, Jr.
Original Assignee
Ag Industries, Inc.
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 Ag Industries, Inc. filed Critical Ag Industries, Inc.
Priority to JP10512705A priority Critical patent/JP2000517246A/ja
Priority to DE19781990A priority patent/DE19781990B4/de
Priority to GB9904231A priority patent/GB2332635B/en
Priority to AU40844/97A priority patent/AU4084497A/en
Priority to BR9711826-5A priority patent/BR9711826A/pt
Priority to CA002264890A priority patent/CA2264890A1/fr
Priority to DE19781990T priority patent/DE19781990T1/de
Publication of WO1998009750A1 publication Critical patent/WO1998009750A1/fr

Links

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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/059—Mould materials or platings
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/057—Manufacturing or calibrating the moulds

Definitions

  • This invention relates broadly to the field of metal production, solidification and casting. More specifically, this invention relates to an improved mold for a continuous casting system that has a longer useful life, is safer and more reliable, improves the uniformity of heat removal, is more stable dimensionally and turns out a better product having enhanced surface quality and decreased stresses than conventional continuous casting molds do.
  • Metals such as steel are continuously cast into strands by pouring hot, molten metal into the upper end of a mold and continuously withdrawing a metal strand from the mold's bottom. As the molten metal passes through the mold, the surfaces of the metal that are next to the mold walls are cooled, solidified and hardened to form a casing or shell of solidified metal around the molten metal in the strand. After leaving the bottom of the mold, the metal continues to cool and the casing or shell of solidified metal around the molten core thickens until the whole strand section is solidified.
  • a conventional continuous casting mold includes a number of liner plates, usually made of copper or copper alloy, and outer support walls surrounding the liner plates.
  • the liner plates define a portion of the mold that contacts the molten metal during the casting process.
  • Parallel vertically extending water circulation slots or passageways are provided between the outer walls and the liner plates to cool the liner plates.
  • water is introduced to these slots, usually at the bottom end of the mold, from a water supply via an inlet plenum that is in communication with all of the slots in a liner plate.
  • the cooling effect so achieved causes an outer skin of the molten metal to solidify as it passes through the mold.
  • the solidification is then completed after the semi- solidified casting leaves the mold by spraying additional coolant, typically water, directly onto the casting.
  • a chrome plating is very porous on the microscopic level, and it has a tendency to deteriorate and come off of the copper during service as a result of corrosion, particularly in the in the meniscus region of the mold liner.
  • a nickel coating is more resistant to corrosion, but is very crack sensitive at the elevated temperatures that the mold surface is operated at. Even a thin nickel coating has a tendency to crack in the meniscus region of the mold liner, where the heat is the greatest. These cracks can penetrate through the plating interface and into the base copper material of the mold liner. This lessens the life of the mold liner, because the copper must be machined when reconditioned to a depth that is sufficient to remove all of the cracks. In addition, cracking presents a safety concern during operation.
  • an improved mold liner for use in a continuous casting machine includes, according to a first aspect of this invention, an inner surface that is constructed and arranged to be connected to structure for conducting heat away from the mold liner during operation; and an outer surface that forms a casting surface of the mold, said outer surface being compressively stressed substantially throughout so that cracks are unlikely to initiate or propagate at said outer surface, whereby the mold liner will exhibit increased lifespan and improved safety with respect to mold liners heretofore known.
  • a mold for a continuous casting machine includes a plurality of mold surfaces for guiding and cooling a strand of molten metal as it hardens and emerges from the mold as a casting, each of said mold surfaces having an outer surface, and wherein said outer surface is compressively stressed substantially throughout so that cracks are unlikely to initiate or propagate at said outer surface, whereby the mold will exhibit increased lifespan and improved safety with respect to molds heretofore known.
  • a method of making a strand of continuously cast material includes steps of introducing molten metal into a mold that includes a plurality of mold surfaces, each of the mold surfaces having an outer surface that is compressively stressed substantially throughout to suppress and prevent cracking of the outer surface; cooling the molten metal by conducting heat away from the molten metal through the mold surfaces; and moving the cast strand out of the mold.
  • a method of preparing a mold surface for a continuous casting machine includes, according to a fourth aspect of the invention steps of: machining the mold surface to a substantially smooth surface; and work hardening the machined surface substantially throughout to impart a residual compressive stress to said surface.
  • a method of preparing a mold surface for a continuous casting machine includes steps of machining the mold surface to a substantially smooth surface; and applying a controlled shot peening process to the machined surface to impart a residual compressive stress to said surface.
  • FIGURE 1 is a diagrammatical cross sectional view taken through a continuous casting mold that is constructed according to a preferred embodiment of the invention
  • FIGURE 2 is a diagrammatical cross sectional view taken through a component of the mold that is depicted in FIGURE 1 ;
  • FIGURE 3 is a diagrammatical cross sectional view, similar to FIGURE 2, depicting a mold that is constructed according to a second preferred embodiment of the invention
  • FIGURE 4 is a diagrammatical cross sectional view, similar to FIGURES 2 and 3, depicting a mold that is made according to a third embodiment of the invention
  • FIGURE 5 is a graphical depiction of the compressive-tinsel strength of a metallic material that has been treated by a controlled shot peening process.
  • FIGURES 6A-6E diagrammatical ly depict a process that is preformed according to a preferred embodiment of the invention.
  • a mold assembly 10 for a continuous casting machine typically includes a plurality of mold liners 12, of which four are illustrated, each of which has an outer surface 14 that together define the mold's casting surface 16.
  • Each of the mold liners 12 further has an inner surface 18 that is mounted to an outer wall 20 of the continuous casting mold 10 for conducting heat away from the mold liner 12 during operation.
  • each of the mold liners 12 has a plurality of interior coolant slots 22 defined therein, which are supplied a coolant, usually water, via a coolant supply pipe 24, which is also depicted in FIGURE 1.
  • a coolant usually water
  • the outer surface 14 of the mold liner 12 is compressively stressed substantially throughout so that cracks are unlikely to initiate or propagate at the outer surface 14.
  • the outer surface 14 includes a layer 26 of such compressively stressed material.
  • the mold liner 12 is fabricated from a thermally conductive material, most often copper or a copper alloy, which can be coated with a corrosion resistant material such as nickel or chromium, alloys thereof, or other material, such as diamond or a refractory material.
  • a coating 30 is applied over the layer 26 of compressively stressed material.
  • the coating 30 is again applied over the layer 26 of compressively stressed material, and than an outer layer of the coating 30 is itself compressively stressed so as to deter cracks in the coating 30 itself, and stop them from spreading if in fact they do occur.
  • the layer 26 of compressively stressed material shown in FIGURE 2, and the layer 36 of compressively stressed coating material shown in FIGURE 4 are preferably given their residual compressive stress by a working hardening process, which is preferably a controlled shot peening process that is applied to the outer surface 14 of the mold liner 34, and the outer surface of the coating 30, respectively.
  • FIGURE 5 is a graphical representation of the compressive stress that is created in a surface by the shot peening process, such as the outer surface 14 of the mold liner 12. It will be seen that shot peening produces a significant amount of residual compressive stress immediately beneath the surface, which is reduced, and actually transitions to a net tensile stress at a significant depth beneath the surface.
  • Shot peening is a cold working process in which the surface of a part is bombarded with small spherical media called shot. Each piece of shot striking the material acts a tiny peening hammer, imparting to the surface a small indentation or dimple. In order for the dimple to be created, the surface fibers of the material must be yielded in tension. Beneath the surface, the fibers try to restore the surface to its original shape, thereby producing below the dimple a hemisphere of cold worked material that is highly stressed in compression. Overlapping dimples develop an even layer of metal in residual compressive stress. In other industries, such as aircraft manufacturing, it is well known that cracks will not initiate or propagate in a shot peened zone. However, to the inventors knowledge, this technique has never been utilized in the manufacture or refurbishing of continuous casting mold parts.
  • FIGURES 6A through 6E a process for reconditioning a moldface of a continuous casting mold will now be discussed.
  • the moldface must be machined to a depth that is sufficient to remove those cracks and imperfections, exposing a fresh relatively smooth surface of copper 40, as is shown FIGURE 6B.
  • this surface 40 of a main body 28 is then work hardened by bombarding it with small spherical particles at a controlled velocity as described above in a shot peening process, which creates the layer 26 of compressively stressed material that is shown in FIGURE 6C and is discussed above.
  • Some molds might be buffed and polished to smooth out the outer surface of the compressively stress layer 26 at this point, and put back into service.
  • Other molds where additional coating is desired, will be coated with a layer 30 of a material such as nickel or chromium, or with a nonmetallic material such as refractory or diamond. In some molds, this material will be polished and the mold can be put into service.
  • the coating 30 is metallic, it may be desirable to again use a shot peening process to form a work hardened compressively stressed layer on the outer surface of the metallic coating 30, as is shown in FIGURE 6E. As discussed above, this additional layer 36 of compressively stressed material will act as a further deterrent to the initiation and propagate of cracks that might otherwise begin in the layer 30 of metallic material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Continuous Casting (AREA)

Abstract

Un procédé permettant de préparer une surface de moule destinée à une machine de coulée continue comprend l'usinage de la surface du moule, qui permet d'obtenir une surface sensiblement lisse, et le rhéo-durcissement de sensiblement toute la surface usinée, qui impose à cette dernière un effort de compression. Dans le mode de réalisation préféré, ce rhéo-durcissement se fait par application d'un grenaillage de précontrainte contrôlé à la surface du moule. La surface peut ensuite être bufflée, ce qui donne un fini satiné, ou revêtue d'un matériau tel que nickel ou chrome. L'effort de compression résiduel produit par le rhéo-durcissement empêche les criques de se former ou de s'étendre à l'intérieur de la paroi de la face du moule, ce qui augmente la durée de vie de cette dernière et rend la machine plus sûre et plus efficiente.
PCT/US1997/014847 1996-09-03 1997-08-22 Surface de moule amelioree pour coulee en continu et procede de fabrication associe WO1998009750A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP10512705A JP2000517246A (ja) 1996-09-03 1997-08-22 連続鋳造法のための改良された鋳型表面及びその製造方法
DE19781990A DE19781990B4 (de) 1996-09-03 1997-08-22 Verbesserte Kokillenwandfläche für den Strangguss und Fertigungsverfahren
GB9904231A GB2332635B (en) 1996-09-03 1997-08-22 Improved mold surface for continuous casting and process for making
AU40844/97A AU4084497A (en) 1996-09-03 1997-08-22 Improved mold surface for continuous casting and process for making
BR9711826-5A BR9711826A (pt) 1996-09-03 1997-08-22 Superfície de molde melhorada para fundição contínua e processo para produção da mesma.
CA002264890A CA2264890A1 (fr) 1996-09-03 1997-08-22 Surface de moule amelioree pour coulee en continu et procede de fabrication associe
DE19781990T DE19781990T1 (de) 1996-09-03 1997-08-22 Verbesserte Kokillenwandfläche für den Strangguss und Fertigungsverfahren

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US70684196A 1996-09-03 1996-09-03
US08/706,841 1996-09-03

Publications (1)

Publication Number Publication Date
WO1998009750A1 true WO1998009750A1 (fr) 1998-03-12

Family

ID=24839282

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/014847 WO1998009750A1 (fr) 1996-09-03 1997-08-22 Surface de moule amelioree pour coulee en continu et procede de fabrication associe

Country Status (7)

Country Link
JP (1) JP2000517246A (fr)
AU (1) AU4084497A (fr)
BR (1) BR9711826A (fr)
CA (1) CA2264890A1 (fr)
DE (2) DE19781990B4 (fr)
GB (1) GB2332635B (fr)
WO (1) WO1998009750A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002078878A2 (fr) * 2001-04-02 2002-10-10 Thyssenkrupp Stahl Ag Lingotiere pour la coulee en continu d'un bain de fusion et procede pour le reglage d'une telle lingotiere
EP1415799A1 (fr) * 2002-10-29 2004-05-06 The Boeing Company Méthode pour l'amélioration de la résistance à la fissuration dans des structures stratifiées fibre-métal

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4845697B2 (ja) * 2006-12-05 2011-12-28 三島光産株式会社 連続鋳造用鋳型

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5768249A (en) * 1980-10-15 1982-04-26 Hitachi Zosen Corp Mold for continuous casting installation
JPS58218351A (ja) * 1982-06-12 1983-12-19 Mishima Kosan Co Ltd 連続鋳造用鋳型及びその製造方法
US4911225A (en) * 1986-08-15 1990-03-27 Outokumpu Oy Mould for billets
US5360053A (en) * 1991-02-06 1994-11-01 Concast Standard Ag Continuous casting mold for steel
US5469910A (en) * 1992-03-05 1995-11-28 Concast Standard Ag Process for the continuous casting of metal, in particular of steel into bloom and billet cross-sections
US5499672A (en) * 1994-06-01 1996-03-19 Chuetsu Metal Works Co., Ltd. Mold for continuous casting which comprises a flame sprayed coating layer of a tungsten carbide-based wear-resistant material
US5549809A (en) * 1993-08-12 1996-08-27 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "Snecma" Method for hardening metallic elements

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2634633C2 (de) * 1976-07-31 1984-07-05 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Stranggießkokille aus einem Kupferwerkstoff, insbesondere zum Stranggießen von Stahl
US4753050A (en) * 1986-06-02 1988-06-28 Penn Lehigh Crane Systems, Inc. Apparatus for cleaning and peening ingot molds
DE4208446A1 (de) * 1992-03-17 1993-09-23 Schloemann Siemag Ag Verfahren zur herstellung einer kokillenbreitseitenwand fuer eine duennbrammengiessanlage

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5768249A (en) * 1980-10-15 1982-04-26 Hitachi Zosen Corp Mold for continuous casting installation
JPS58218351A (ja) * 1982-06-12 1983-12-19 Mishima Kosan Co Ltd 連続鋳造用鋳型及びその製造方法
US4911225A (en) * 1986-08-15 1990-03-27 Outokumpu Oy Mould for billets
US5360053A (en) * 1991-02-06 1994-11-01 Concast Standard Ag Continuous casting mold for steel
US5469910A (en) * 1992-03-05 1995-11-28 Concast Standard Ag Process for the continuous casting of metal, in particular of steel into bloom and billet cross-sections
US5549809A (en) * 1993-08-12 1996-08-27 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "Snecma" Method for hardening metallic elements
US5499672A (en) * 1994-06-01 1996-03-19 Chuetsu Metal Works Co., Ltd. Mold for continuous casting which comprises a flame sprayed coating layer of a tungsten carbide-based wear-resistant material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002078878A2 (fr) * 2001-04-02 2002-10-10 Thyssenkrupp Stahl Ag Lingotiere pour la coulee en continu d'un bain de fusion et procede pour le reglage d'une telle lingotiere
WO2002078878A3 (fr) * 2001-04-02 2003-03-13 Thyssenkrupp Stahl Ag Lingotiere pour la coulee en continu d'un bain de fusion et procede pour le reglage d'une telle lingotiere
EP1415799A1 (fr) * 2002-10-29 2004-05-06 The Boeing Company Méthode pour l'amélioration de la résistance à la fissuration dans des structures stratifiées fibre-métal
US7192501B2 (en) 2002-10-29 2007-03-20 The Boeing Company Method for improving crack resistance in fiber-metal-laminate structures

Also Published As

Publication number Publication date
AU4084497A (en) 1998-03-26
CA2264890A1 (fr) 1998-03-12
GB2332635A (en) 1999-06-30
GB2332635B (en) 2000-07-05
GB9904231D0 (en) 1999-04-21
DE19781990T1 (de) 1999-08-12
BR9711826A (pt) 1999-08-31
DE19781990B4 (de) 2009-01-02
JP2000517246A (ja) 2000-12-26

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