US3726332A - Semi-continuous casting method utilizing a thermoinsulating sheet material - Google Patents

Semi-continuous casting method utilizing a thermoinsulating sheet material Download PDF

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Publication number
US3726332A
US3726332A US00120947A US3726332DA US3726332A US 3726332 A US3726332 A US 3726332A US 00120947 A US00120947 A US 00120947A US 3726332D A US3726332D A US 3726332DA US 3726332 A US3726332 A US 3726332A
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US
United States
Prior art keywords
mould
dummy
wall structure
metal
billet
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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
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US00120947A
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English (en)
Inventor
R Clegg
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British Aluminum Co Ltd
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British Aluminum Co Ltd
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Publication date
Application filed by British Aluminum Co Ltd filed Critical British Aluminum Co Ltd
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    • 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
    • B22D11/08—Accessories for starting the casting procedure
    • B22D11/088—Means for sealing the starter bar head in the moulds
    • 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
    • B22D11/049—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for direct chill casting, e.g. electromagnetic casting

Definitions

  • a method for the semi continuous casting of metal in a mould having a vertical wall structure and a dummy which is initially disposed within the lower part of that wall structure, said'dummy being lowered progressively from the wall structure as metal in the mould solidities and casting proceeds, in which before the metal is poured into the mould a strip of heat resistant and thermally insulating sheet material, preferably woven fiber glass material, is laid on part of the inside of the wall structure immediately above the upper surface of the dummy and preferably extending a short distance round the corner onto the top of the dummy, so that it covers at least part of the side of the lower end of the cast metal as it emerges from the mould thus reducing the differential shrinkage between the metal first solidified on the dummy and that immediately following causing a reduction in the degree of upward bowing of the edges of the bottom surface of the billet.
  • the sheet material can extend continuously up the wall structure to the top of
  • molten metal is poured into a mould, usually of generally rectangular cross-section, the bottom of which is formed by a starting block or dummy.
  • the metal poured into the mould solidifies on the dummy to a depth of some 1 to 2 inches, and as casting continues, the dummy is lowered from the mould so that an elongated solid billet is continuously formed by molten metal within the mould solidifying on top of the previously solidified metal of the billet leaving the bot tom of the mould.
  • the present invention provides a method for the semi-continuous casting of metal in a mould having a wall structure and a starting block or dummy initially disposed within the lower part of that wall structure, said dummy being lowered progressively from the wall structure as casting proceeds, comprising laying, before metal is poured into the mould, a strip of heat resistant material around at least part of the peripheral corner formed betweenthe dummy and the inside of said wall structure, said strip extending onto the upper surface of the dummy and extending at least a short distance up the wall structure of the mould.
  • the mould is of generally rectangular cross-section, and said strip of material is laid in said corner along one or more sides of the mould.
  • the heat resistant material is fiber glass cloth material.
  • the fiber glass cloth material is a woven fabric.
  • the strip of material as laid along at least one side of the rectangular cross-section may be arranged to extend up the full height of the respective side wall of the mould in a continuous sheet to lie between metal cast in the mould and that side wall, means being provided to feed said sheet to so lie continuously with the lowering of said dummy.
  • FIG. 1 is a schematic cross-sectional view of a mould arrangement for the continuous casting of metal, in an initial state ready for the commencement of casting,
  • FIG. 2 is a schematic cut away perspective view of the mould of FIG. 1 arranged in accordance with one embodiment of the invention
  • FIG. 3 is a similar view to that of FIG. 2 at a later stage in the casting of a billet arranged in accordance with a second embodiment of the invention.
  • FIG. 4 is a series of side view of the lower end of a lata east- FIG. 1 shows a cross-sectional view o f the arrangement of a mould and starting block or dummy for the continuous casting of metal.
  • the arrangement includes a mould l of generally rectangular cross-section and a dummy 2 corresponding in cross-section to the mould l and arranged initially in the bottom of the mould 1 to form the bottom wall thereof.
  • the dummy 2 is provided with means (not shown) whereby the dummy may be lowered progressively from the mould 1 after commencement of and during the continued casting of metal in the mould 1.
  • the wall strength of the mould l is surrounded by a water-jacket 3 arranged to collect water from a series of water spray jets 4 which are arranged around the mould I so that in operation, jets of water impinge on the outer surfaces of the mould 1 to cool it, and the water runs down into the water-jacket 3 to collect therein.
  • the water-jacket 3 is itself provided with a series of spray holes 5 arranged around the lower part of the jacket, either formed in or mounted on the walls of the mould 1 so that water in the jacket flows out of the spray holes 5 to impinge on and cool the dummy when it is in its initial starting position, as shown in FIG. 1, and subsequently to impinge on and continually cool the cast billet as it emerges from the mould 1 when the dummy is lowered.
  • the upper surface of the dummy 2 can be flat or provided with a recess, leaving a narrow land 7 around the periphery of the dummy.
  • Such recess is designed to suit the metal feed arrangements and does not concern this invention
  • a strip 8 of heat resistent material preferably woven fiber glass cloth, is laid round the inside of the mould along the corners formed between the side walls of the mould and the dummy 2, the strip of cloth 8 lying at least over the land 7 on the dummy 2, and extending a short distance up the inside of the walls of the mould 1.
  • the material strip 8 is pressed into the corners so that a sharp corner is presented to the molten metal.
  • the fiber glass cloth strip 8 initially contributes to the seal between the dummy 2 and the mould 1 when molten metal is first poured into the mould, and as the molten metal solidifies in the bottom of the mould on top of the dummy 2, the fiber glass cloth strip 8 becomes attached to the surface of the solidified billet.
  • the fiber glass cloth strip 8 retains and prevents run-out of molten metal from any part of the surface of the solidified billet beneath the strip as it contracts away from the mould l and locally remelts as discussed in the preamble of this specification.
  • the heat resistant material for the strip 8 is that it will withstand the temperature of the molten metal to be cast, and other materials than fiber glass may be used, although fiber glass is the preferred material for use in the casting of aluminum and its alloys.
  • the fiber glass cloth strip 8 is shown as being arranged around all of the four sides of the rectangular mould 1. It is to be understood that in many instances it is not essential that the cloth strip is placed around each side, and it may in some cases be sufficient to only provide the cloth strip at the ends along the shorter sides of the mould l where the shrinkage away from the mould walls is usually most acute.
  • the use of the strip 8 may be extended to alleviate blebbing on the sides of the cast billet. As discussed in the preamble of this Specification, blebbing results from the surface of the cast billet remelting during the cooling process and small quantities of liquid metal escaping to form blebs or protruberances on the side of the cast billet.
  • the fiber glass cloth strip 8 laid around the bottom of the mould before the commencement of casting is continued as a sheet up the side of the mould l, and a roll of such cloth as indicated at 10 in FIG. 3 is provided, so that as the dummy 1 is lowered the glass cloth can move down the side of the mould 1 with the progress of the casting operation, being continually supplied from the roll 10; it can be seen that the whole of a side of the cast billet can be protected by a sheet of glass cloth material. This glass cloth material again adheres to the side of the cast billet, and retains and thus prevents the locally remelting metal in the surface of the cast billet beneath the material from forming belbs.
  • the effect of the fiber glass material is to restrict the cooling effect of the water spray system on the billet issuing from the mould to such a degree that the differential shrinkage between the metal first solidified on the dummy and that immediately following is significantly reduced, with a corresponding reduction in the degree of upward bowing of the edges of the bottom surface of the billet.
  • FIG. 4A shows a side view of the lower end of a typical cast billet with a curvature height indicated at X," X being as much as three inches on a billet which may be some 62 inches wide
  • FIG. 4B shows a similar view of billet cast in similar alloy with the use of the glass cloth strip 8 and for which the height of the curvature has been reduced to substantially X/2
  • FIG. 4c illustrates a consequence of excessive curvature in that a high stress region is created in the center of the billet which can cause a stress crack during cooling as indicated at 20 in that FIG, particularly in the casting of alloys of aluminum having significant quantities of magnesium and/or copper in their analysis. The creation of such stress cracks can be substantially avoided by the reduction in curvature which arises with the use of the glass cloth strip 8.
  • a method for the semi-continuous casting of a metal billet in a mould having a vertical wall structure and a dummy which is initially disposed within the lower part of that wall structure, said dummy being lowered progressively from the wall structure as metal in the mould solidifies and casting proceeds comprising laying, before metal is poured into the mould, a strip of heat resistant and thermally insulating sheet material around at least part of the peripheral corner formed between the dummy and the inside of said wall structure, said strip extending onto the upper surface of the dummy and turned upward to extend at least a short distance up the wall structure above the upper surface of the dummy, and said strip being attached to the billet as the molten metal solidifies in the bottom of the mold on top of the dummy so that it confines the side of the lower end of the cast billet as it emerges from the mould.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US00120947A 1970-03-12 1971-03-04 Semi-continuous casting method utilizing a thermoinsulating sheet material Expired - Lifetime US3726332A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1197870 1970-03-12

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US3726332A true US3726332A (en) 1973-04-10

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US00120947A Expired - Lifetime US3726332A (en) 1970-03-12 1971-03-04 Semi-continuous casting method utilizing a thermoinsulating sheet material

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US (1) US3726332A (OSRAM)
CA (1) CA947940A (OSRAM)
DE (1) DE2111849A1 (OSRAM)
FR (1) FR2081897B1 (OSRAM)
GB (1) GB1345167A (OSRAM)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009748A (en) * 1974-02-14 1977-03-01 Mannesmann Aktiengesellschaft Method of starting continuous casting
CN102632208A (zh) * 2012-05-11 2012-08-15 江苏亚太轻合金科技股份有限公司 铝及铝合金半连续铸造用引锭装置
CN112276026A (zh) * 2020-09-26 2021-01-29 广东韶钢松山股份有限公司 一种封引锭组合物、其制备方法及其应用

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4306943C2 (de) * 1993-03-05 1995-05-18 Vaw Ver Aluminium Werke Ag Anfahrkopf für eine Vertikal-Stranggießanlage

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1893207A (en) * 1932-01-22 1933-01-03 Messler Hot top
US2869197A (en) * 1954-11-30 1959-01-20 Allegheny Ludlum Steel Process of casting metal on glass fiber mat
US3166807A (en) * 1962-09-28 1965-01-26 Robert E Daley Reuseable hot top
US3262161A (en) * 1963-06-27 1966-07-26 United States Steel Corp Sealing and insulating means for continuous casting starter bars
US3326270A (en) * 1963-06-12 1967-06-20 Aluminium Lab Ltd Continuous casting of metals
US3381741A (en) * 1963-06-07 1968-05-07 Aluminum Co Of America Method and apparatus for continuous casting of ingots
US3415483A (en) * 1967-04-12 1968-12-10 Oglebay Norton Co Hot top structure
US3457984A (en) * 1965-10-01 1969-07-29 Kawasaki Steel Co Process and apparatus for the continuous casting of steel

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1344893A (fr) * 1962-05-29 1963-12-06 Procédé de coulée continue de métal et appareil de coulée continue destiné à mettre en oeuvre ledit procédé
FR1399942A (fr) * 1964-06-27 1965-05-21 United States Steel Corp Dispositif d'étanchéité et d'isolation pour barres-amorces ou mannequins dans les installations de coulée continue de métal

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1893207A (en) * 1932-01-22 1933-01-03 Messler Hot top
US2869197A (en) * 1954-11-30 1959-01-20 Allegheny Ludlum Steel Process of casting metal on glass fiber mat
US3166807A (en) * 1962-09-28 1965-01-26 Robert E Daley Reuseable hot top
US3381741A (en) * 1963-06-07 1968-05-07 Aluminum Co Of America Method and apparatus for continuous casting of ingots
US3326270A (en) * 1963-06-12 1967-06-20 Aluminium Lab Ltd Continuous casting of metals
US3262161A (en) * 1963-06-27 1966-07-26 United States Steel Corp Sealing and insulating means for continuous casting starter bars
US3457984A (en) * 1965-10-01 1969-07-29 Kawasaki Steel Co Process and apparatus for the continuous casting of steel
US3415483A (en) * 1967-04-12 1968-12-10 Oglebay Norton Co Hot top structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009748A (en) * 1974-02-14 1977-03-01 Mannesmann Aktiengesellschaft Method of starting continuous casting
CN102632208A (zh) * 2012-05-11 2012-08-15 江苏亚太轻合金科技股份有限公司 铝及铝合金半连续铸造用引锭装置
CN102632208B (zh) * 2012-05-11 2013-09-25 江苏亚太轻合金科技股份有限公司 铝及铝合金半连续铸造用引锭装置
CN112276026A (zh) * 2020-09-26 2021-01-29 广东韶钢松山股份有限公司 一种封引锭组合物、其制备方法及其应用
CN112276026B (zh) * 2020-09-26 2022-07-29 广东韶钢松山股份有限公司 一种封引锭组合物、其制备方法及其应用

Also Published As

Publication number Publication date
DE2111849A1 (de) 1971-09-30
FR2081897B1 (OSRAM) 1977-01-28
GB1345167A (en) 1974-01-30
CA947940A (en) 1974-05-28
FR2081897A1 (OSRAM) 1971-12-10

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