US3206809A - Continuous casting of plates and strips from non-ferrous metals - Google Patents

Continuous casting of plates and strips from non-ferrous metals Download PDF

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Publication number
US3206809A
US3206809A US227622A US22762262A US3206809A US 3206809 A US3206809 A US 3206809A US 227622 A US227622 A US 227622A US 22762262 A US22762262 A US 22762262A US 3206809 A US3206809 A US 3206809A
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United States
Prior art keywords
casting
mold
strips
sides
continuous casting
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Expired - Lifetime
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US227622A
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English (en)
Inventor
Herrmann Erhard
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Rio Tinto Switzerland AG
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Alusuisse Holdings AG
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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars

Definitions

  • a thickness of 6.4 to 13 mm. can be cast without longitudinal cracks appearing in the middle because the metal solidifies mostly before reaching the narrowest passage between the two rolls (the nip of the rolls), so that after the main solidification a squeezing of the pasty metal takes place which squeezing counteracts the shrinkage.
  • the object of my present invention is a method for the continuous casting of thin plates or strips from non-ferrous metals according to which method the formation of longitudinal cracks in the middle of the casting is avoided by means of a novel control of the dissipation of heat.
  • the cooling of the cast metal in the mold is controlled in such a way that the middle part of the solidification front, considered in the width of the casting, projects in opposite direction to the metal flow, that means in direction to the mold inlet.
  • This may, for instance, be accomplished by the specific form of the mold and coupled, for example, with spraying-cooling of the center portion of the casting, or heating of the edge portions.
  • the method according to my invention is not applicable to the casting of heavy sections, for example rolling slabs and round billets as it is not possible to dissipate the heat in the middle of the casting in such a way that the solidification front projects into the liquid metal pool.
  • a ring of small height as casting mold one can obtain at the utmost that the molten metal pool becomes shallow and the solidification front approaches the shape of a plane.
  • the method of the invention is only applicable in the casting of thin strips or plates because in this case the cooling takes place substantially in two dimensions and because the projection of the solidification front in opposite direction to the metal flow is essential only in the width of the casting.
  • the shrinkage in transverse direction to the width of the plate or strip is not important in view of avoiding longitudinal cracks in the middle of the casting. Only a great width of the plate or strip relatively to its thickness makes possible the performance of the method according to the invention.
  • the most suitable shape and length of the projecting middle solidification front depends on many factors, for instance on the casting material, the material of the mold, the casting section, the temperature, the casting speed and so on. In some cases a projection of the solidification front by a length of 5% of the width of the plate or strip may be sufficient, but mostly a greater projection, for instance of 15 to 30%, is necessary. The maximum length of the projection is only limited by the length or height of the mold. Preferably the most suitable shape of the solidification front is determined by casting experiments.
  • FIG. 1 is a fragmentary vertical sectional view of a vertical continuous casting mold and casting, taken on the line 1-1 of FIG. la;
  • FIG. la is a fragmentary perspective view thereof
  • FIG. lb is an end elevational view of the same
  • FIG. 2 is a side elevational view of the mold
  • FIG. 3 is a side elevational view, similar to FIG. 2, but embodying a further modification
  • FIG. 4 is a side elevational view, similar to FIGS. 2 and 3, but embodying a further modification
  • FIG. 5 is a fragmentary elevational View of a modification embodying a casting wheel.
  • FIG. 6 is a perspective view of the casting wheel of FIG. 5.
  • a strip 2 is shown during casting; the strip is shown in a section through the narrow sides of the mold and of the casting.
  • the arrow a indicates the direction of the metal filow 3 in the molten metal pool.
  • the middle part 4 of the solidification front projects in opposite direction to the metal flow.
  • 5 indicates the frozen shell which is formed at the narrow sides of the mold at once after pouring the metal into the a mold.
  • a frozen shell is formed which must be held as thin as possible until it passes the plane 6 of the projecting part 4 of the solidification front. Only at 7 is the strip solidified throughout its section.
  • a mold For performing the method according to the invention in the vertical semi-continuous casting a mold may be used in which the narrow sides 8 reach lower than the middle part of the broad sides 9, as sketched in FIG. 2, which shows schematically a side view of the mold.
  • the narrow sides 8 and the adjacent parts of the mold 1 are longer than the middle part of the broad sides 9 which are cut out at 10.
  • Other possible shapes of the broad sides 9 of a mold are shown in FIGS. 3 and 4. Due to the great recess 10 at the broad sides 9 of the mold, cooling water may be sprayed for instance from nozzles 16 onto the casting in such a way that solidification preferably takes place in the middle part of the casting considered from the broad side.
  • the mold may also be assembled in such a way that the narrow sides 8 consist of a material (for example graphite), which is not such a good thermal conductor as the material of the broad sides 9 or the middle part of them, which material may be copper. Also heating the upper part of the narrow sides of the mold can be taken into consideration.
  • a material for example graphite
  • the invention may also be used in the vertical multiple continuous casting where simultaneously several castings are produced. But in this case the cooling of the broad sides presents greater difliculties.
  • the method according to the invention is especially suitable for the horizontal continuous casting in which the casting mold is joined tightly to a supply container filled with the molten metal, so that there is no free molten metal level in the casting mold.
  • a horizontal casting process is disclosed for instance in the US. Patent 2,996,771 and in the British Patent 806,313.
  • thin plates are cast preferably in flat position and not upright in order that the cooling is the same at both narrow sides.
  • the slender section it is also preferable with regard to the slender section to hold the melt flowing into the mold under a relatively high pressure, which can be attained easily by maintaining a high metal level in the supply container.
  • the method according to my invention may also be applied in the strip casting between a rotating casting Wheel and a covering strip (rotary method).
  • the casting wheel comprises a middle ring made from a metal of high thermal conductivity, for example aluminum but preferably copper, which ring may be provided at its inner circumference with cooling ribs, and of two side parts made from a metal of a relatively low thermal conductivity, suitably from steel.
  • FIG. 5 shows schematically and not true to size the front elevation of the upper part of such a casting wheel, consisting of a ring 11 made from copper and two side parts 12 and 13 made from steel. 14 designates the covering steel strip and 15 the casting mold.
  • the assembling of the ring with the side parts may be performed by mechanical means or by welding or brazing.
  • Copper has a thermal conductivity which is five times that of steel.
  • the main part of the heat is removed through the copper ring 11 which is cooled at its inner circumference with water, which results in the formation of a solidification front having a middle portion thereof projecting beyond the portions adjacent thereto in a direction opposite to the direction of metal flow.
  • An apparatus for strip casting comprising a rotating wheel having a middle circumferential part and side parts and a covering strip, between which there is formed the casting mold, said middle circumferential part of said casting wheel being made from copper and said side parts from steel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US227622A 1961-08-25 1962-08-21 Continuous casting of plates and strips from non-ferrous metals Expired - Lifetime US3206809A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH992661A CH389171A (de) 1961-08-25 1961-08-25 Verfahren und Giessform zum Stranggiessen von Platten und Bändern aus Nichteisenmetallen

Publications (1)

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US3206809A true US3206809A (en) 1965-09-21

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US (1) US3206809A (de)
CH (1) CH389171A (de)
GB (1) GB951032A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3311955A (en) * 1965-01-06 1967-04-04 Southwire Co Disposable mold member for casting machine
US3511305A (en) * 1965-05-03 1970-05-12 Alfred J Wertli Method for cooling a continuous casting
US3519062A (en) * 1966-10-06 1970-07-07 Alfred J Wertli Apparatus for producing strip metal by continuous casting
US3520352A (en) * 1967-10-19 1970-07-14 Koppers Co Inc Continuous casting mold having insulated portions
US20050045302A1 (en) * 2002-01-30 2005-03-03 Heggset Bjarne A. Casting wheel for continuous casting of metal

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2450428A (en) * 1944-03-23 1948-10-05 Clarence W Hazelett Strip forming apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2450428A (en) * 1944-03-23 1948-10-05 Clarence W Hazelett Strip forming apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3311955A (en) * 1965-01-06 1967-04-04 Southwire Co Disposable mold member for casting machine
US3511305A (en) * 1965-05-03 1970-05-12 Alfred J Wertli Method for cooling a continuous casting
US3519062A (en) * 1966-10-06 1970-07-07 Alfred J Wertli Apparatus for producing strip metal by continuous casting
US3520352A (en) * 1967-10-19 1970-07-14 Koppers Co Inc Continuous casting mold having insulated portions
US20050045302A1 (en) * 2002-01-30 2005-03-03 Heggset Bjarne A. Casting wheel for continuous casting of metal
US6962190B2 (en) * 2002-01-30 2005-11-08 Heggset Engineering A.S. Casting wheel for continuous casting of metal

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Publication number Publication date
GB951032A (en) 1964-03-04
CH389171A (de) 1965-03-15

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