US2949652A - Continuous casting of metals - Google Patents

Continuous casting of metals Download PDF

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Publication number
US2949652A
US2949652A US715105A US71510558A US2949652A US 2949652 A US2949652 A US 2949652A US 715105 A US715105 A US 715105A US 71510558 A US71510558 A US 71510558A US 2949652 A US2949652 A US 2949652A
Authority
US
United States
Prior art keywords
mould
metal
wall
lubricant
insert
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.)
Expired - Lifetime
Application number
US715105A
Other languages
English (en)
Inventor
Hobbs John Francis
Thorley Thomas
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries 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
Priority claimed from GB490257A external-priority patent/GB853490A/en
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Application granted granted Critical
Publication of US2949652A publication Critical patent/US2949652A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D11/04—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
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • 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
    • B22D11/07—Lubricating the moulds

Definitions

  • FIGJ. 1 A first figure.
  • FIG. 5 is a diagrammatic representation of FIG. 5.
  • This invention is concerned with improved apparatus for the continuous casting of metals and alloys.
  • the term continuous casting as used hereinafter includes both strictly continuous and semi-continuous processes of metals and alloys and which employ a Water-cooled mould with direct cooling of the emergent casting
  • the cooling rate within the mould is less than that immediately below it, where water is in direct contact with the casting.
  • solidiiication shrinkage of the casting produces a gap between it and the mould, which not only reduces heat conduction to the mould wall but also, when casting alloys with a considerable freezing range, such, for example, as certain aluminum base alloys, may permit exudation of liquid from the partially solidified metal, forming objectionable blebbing on the surface of the final casting.
  • the mould used in this process is open at both ends and the wall thereof adjacent the mould cavity is provided with at least one insert which permits the passage of coolant through it into the mould cavity so as to cool at least a peripheral zone of the casting passing through the mould cavity.
  • a mould is hereinafter referred to as a mould of the type described.
  • Such inserts formed from compacted powdered materials have, however, a somewhat rough surface which causes frictional eifects between the said surface and the solidifying casting in its passage over it, resulting in impaired surface quality of the casting and increased mould wear. It is difiicult or in some cases impossible to obtain a sufliciently smooth surface on the material from which the inserts are made to avoid such effects.
  • the insert in the mould wall is made from a wrought metallic material having a smooth finish on the side adjacent the mould cavity and having fine passages to permit how of coolant or lubricant through it from the side remote from the mould cavity to the side adjacent the mould cavity.
  • the said material may be provided with a backing of a compacted powder material also permeable to the mould coolant and/ or lubricant.
  • the said wrought material should have a thermal conductivity exceeding 0.05 c.g.s. units at room temperature.
  • the permeability for example, for a water-jacketed mould, should be about 45 cubic centimetres/square centimetre/second to water under in the jacket with a mould wall /2 in. thick.
  • the wrought material may be prepared in a number of ways. For example, it may be prepared by bonding together in any suitable manner, such as by brazing, a plurality of superimposed layers of metal gauze and then submitting the assembly to a rolling operation. Byway of further example, it may be prepared by controlled electrodeposition of a suitable metal on a perforated metal plate until the perforations are reduced to very fine apertures. The apertures may be further reduced by an additional operation such as rolling.
  • the said wrought material may be provided with the requisite smooth finish by any suitable mechanical, chemical, or electrochemical polishing process or combination of two or more such processes.
  • the powdered material from which the backing is formed may consist of a metal or alloy powder, or a suitable non-metallic substance such for example as graphite.
  • the permeability of the compacted material will be determined in accordance with the nature of the fluid to be passed through it, the rate at which it is required in the mould, and the pressure under which it is to be applied. When heat is required to be transferred from the metal within the mould across the mould wall, of which the backing forms a part, the latter must be of material of adequate thermal conductivity for this purpose.
  • the wrought metal when used as a facing, may be secured to the backing by any suitable means, such as a mechanical joint, an adhesive, or a metallic bond, and polishing of the facing may be effected either before or after it is secured to the backing.
  • the insert may extend through part of or the whole thickness and/or depth of the mould wall and around part or the whole of the internal periphery of the mould.
  • the section at the top of the mould wall may be of the usual solid construction, and a similar section may also be incorporated at the lower end of the mould.
  • the mould may be either cylindrical in shape for production of round billets, or rectangular for production of flat slabs or of any other desired cross-section.
  • the mould may be used in continuous casting processes in which molten metal is introduced via a launder, downspout or other means, and a free molten metal surface is maintained in the mould, or in processes in which molten metal is supplied to the mould from a reservoir superimposed thereon and there is no free metal surface in the mould.
  • the longitudinal alignment of the mould may be either vertical or horizontal.
  • the liquid coolant passing through the mould wall into the mould cavity may under suitable conditions also function as a mould lubricant.
  • Figure 1 represents a vertical section through a jacketed mould wall
  • Figure 4 represents a vertical section through another construction of mould wall adapted for the supply of lubricant
  • Figure represents a vertical section through a third construction of mould wall adapted for the supply of lubricant.
  • an insert 1 of the said wrought metal having a polished surface 2 in accordance with the invention is secured between the arms of a metal channel section 3 forming an annular jacket which water is circulated under snfiiceint pressure to force it through the wall 1 into the interior of the mould.
  • the mould wall 5 of solid metal has a.
  • peripheral recess into which is fitted a composite insert consisting of a polished wrought metal facing 6 secured to a sintered powder metal backing 7.
  • Mould lubricant is supplied under pressure through the entry 8 to an annular passage (not shown) in the top of the mould from which it permeates through the insert and thence into the mould cavity.
  • the cooling means for the mould wall are not shown but may consist of either a water jacket or sprays.
  • the solid metal mould wall 9 has a peripheral recess into which a sheet of polished wrought metal material 10, either alone ( Figure 4) or with a sintered powder material backing 11 ( Figure 5) is secured, forming a narrow annular passage through which mould lubricant is circulated under turbulent flow conditions and thence permeates through the insert to the mould cavity.
  • the turbulent flow circulation of the lubricant permits adequate heat transfer from the solidifying metal in the mould across the composite mould wall, which is cooled by means of a water jacket or sprays (not shown).
  • An insert for a mold wall of the character described comprising superimposed layers of metallic gauze brazed together and reduced in a rolling operation, said gauze having a smooth finish on the side thereof adapted to be positioned adjacent the mold cavity, and having fine passages thercthrough to permit flow of coolant or lubricant through said insert.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US715105A 1957-02-13 1958-02-13 Continuous casting of metals Expired - Lifetime US2949652A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB490257A GB853490A (en) 1957-02-13 1957-02-13 Improvements in the continuous casting of metals
GB2949652X 1957-02-13

Publications (1)

Publication Number Publication Date
US2949652A true US2949652A (en) 1960-08-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
US715105A Expired - Lifetime US2949652A (en) 1957-02-13 1958-02-13 Continuous casting of metals

Country Status (2)

Country Link
US (1) US2949652A (de)
CH (1) CH366130A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521849A (en) * 1966-10-22 1970-07-28 Schloemann Ag Continuous metal-casting mold
FR2433382A1 (fr) * 1978-07-28 1980-03-14 Sumitomo Metal Ind Lingotiere autolubrifiante pour la coulee continue, notamment d'acier
EP0060359A1 (de) * 1981-03-16 1982-09-22 Olin Corporation Kontinuierliche Schmierung von Giesskokillen
FR2508829A1 (fr) * 1981-07-06 1983-01-07 Fives Cail Babcock Procede de refroidissement et de lubrification de la paroi d'une lingotiere de coulee continue
US4420030A (en) * 1981-04-01 1983-12-13 Olin Corporation Continuous lubrication casting molds
US4437508A (en) 1979-10-15 1984-03-20 Olin Corporation Continuous lubrication casting molds

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB634217A (en) * 1947-05-08 1950-03-15 John Kilner Wells Improvements in and relating to sieves, perforate screens, or filter plates
GB708632A (en) * 1951-01-08 1954-05-05 Ici Ltd Improvements in or relating to the continuous casting of metals
US2693624A (en) * 1951-09-28 1954-11-09 Du Pont Continuous casting of metals
US2747244A (en) * 1953-07-15 1956-05-29 Norman P Goss Porous mold for the continuous casting of metals
CA532539A (en) * 1956-11-06 B. Brennan Joseph Fibrous mould liner

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA532539A (en) * 1956-11-06 B. Brennan Joseph Fibrous mould liner
GB634217A (en) * 1947-05-08 1950-03-15 John Kilner Wells Improvements in and relating to sieves, perforate screens, or filter plates
GB708632A (en) * 1951-01-08 1954-05-05 Ici Ltd Improvements in or relating to the continuous casting of metals
US2693624A (en) * 1951-09-28 1954-11-09 Du Pont Continuous casting of metals
US2747244A (en) * 1953-07-15 1956-05-29 Norman P Goss Porous mold for the continuous casting of metals

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521849A (en) * 1966-10-22 1970-07-28 Schloemann Ag Continuous metal-casting mold
FR2433382A1 (fr) * 1978-07-28 1980-03-14 Sumitomo Metal Ind Lingotiere autolubrifiante pour la coulee continue, notamment d'acier
US4437508A (en) 1979-10-15 1984-03-20 Olin Corporation Continuous lubrication casting molds
EP0060359A1 (de) * 1981-03-16 1982-09-22 Olin Corporation Kontinuierliche Schmierung von Giesskokillen
US4420030A (en) * 1981-04-01 1983-12-13 Olin Corporation Continuous lubrication casting molds
FR2508829A1 (fr) * 1981-07-06 1983-01-07 Fives Cail Babcock Procede de refroidissement et de lubrification de la paroi d'une lingotiere de coulee continue

Also Published As

Publication number Publication date
CH366130A (de) 1962-12-15

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