US3580325A - Continuous casting machine for slabs - Google Patents

Continuous casting machine for slabs Download PDF

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Publication number
US3580325A
US3580325A US813171A US3580325DA US3580325A US 3580325 A US3580325 A US 3580325A US 813171 A US813171 A US 813171A US 3580325D A US3580325D A US 3580325DA US 3580325 A US3580325 A US 3580325A
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Prior art keywords
curvature
mold
slab
center
continuous casting
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Expired - Lifetime
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US813171A
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English (en)
Inventor
Hans Schrewe
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Vodafone GmbH
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Mannesmann AG
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Publication date
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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

Definitions

  • a continuous casting machine for slabs includes a mold that has a mold passage of trapezoidal cross section with the base surface on the side of the center of curvature of the casting and the opposite surface being symmetrically arranged about the central plane of the mold passage.
  • the invention relates to the continuous casting of metal, and relates more particularly to the continuous casting of metal in a mold that is externally cooled, for instance a liquid cooled mold, the axis of mold space of which is either straight or arcuate. Still more particularly, the instant invention relates to the continuous casting of metal of rectangular cross section, such as slabs or wide billets, in such a mold.
  • the cross section of the casting generally corresponds to the cross section of the mold in which the metal is cast.
  • the mold in the past was given the same type cross section as the cross section of the finally formed casting.
  • the instant invention aims to avoid this drawback, and to have a rectangularly shaped slab as its end product. To accomplish this, it has been found that the mold passage can no longer have a rectangular cross section; instead, the instant invention provides for a mold passage of trapezoidal shape that will yield a slab of rectangular cross section after it has been guided through and out of the curvature.
  • FIG. 1 is a fragmentary schematic side elevational view, showing a curved mold for continuous casting and the continuous casting emerging therefrom;
  • FIG. 2 is a fragmentary side elevational view, similar to FIG. 1, but showing a mold with an inclined straight axis;
  • FIG. 3 is a fragmentary plan view, partly in section, showing the mold and trapezoidal slab in section, taken on the line 3-3 of FIG. 1;
  • FIG. 4 is a sectional view of the still trapezoidal casting
  • FIG. 5 is a sectional view of the slab having assumed rectangular shape, taken on the line 5-5 of FIG. 1, after the slab has been straightened;
  • FIG. 6 is a sectional view of FIG. 1;
  • FIG. 7 is a sectional view of the mold, similar to FIG. 6, but taken on the line 7-7 of FIG. I.
  • FIGS. 1 and 2 there is shown a mold 1 in FIG. 1 with a curved mold space axis; and a similar mold I in FIG. 2 which, however, has a mold space axis that is inclined to the vertical.
  • the slab 2 that is cast in the molds l, 1', respectively, descends at least after it leaves the mold in a curved path until it reaches a substantially horizontal direction; during that time and path, the core of the slab is still at least in part liquid, as shown at 3 in FIGS. 1,2 and 3.
  • the center of curvature of the slab 2 is shown at X, with a radius of curvature R in FIG. 1, and at Y with a radius of curvature R in FIG. 2.
  • the mold has a plurality of sidewalls, for instance four sidewalls, namely two opposite wide sidewalls 4 and 5, and two opposite narrow sidewalls 6 and 7.
  • the main wide wall 4 (FIG. 1; 4', FIG. 2) is disposed on the side of the center ofcurvature of the slab 2, while the other wide wall 5 (FIG. I; 5', FIG. 2) is disposed opposite thereto relative to the casting in the mold.
  • Guide means such as guide rolls 11 are shown schematically in FIGS. 1 and 2, for guiding the slab 2 past the curvature at least into the initiation of the straightening.
  • the rolls 11 are of conventional construction, and perform the same function that they perform in devices of the prior art; except that they now receive from the mold 1, I a casting that is shaped trape zoidally rather than rectangularly, and which, upon completing its run through the guide means, will assume in the end a rectangular shape.
  • the invention provides that the form-giving part, namely the internal surface of the wide main wall 4 (FIG. I; 4, FIG. 2) which, relative to the casting inside the mold, is disposed on the side of the center of curvature of the slab 2, is larger than the opposite form-giving part, namely the internal surface of the opposite wide wall 5 (FIG. 1; 5', FIG. 2) of the mold l, 1', respectively.
  • the form-giving part namely the internal surface of the wide main wall 4 (FIG. I; 4, FIG. 2) which, relative to the casting inside the mold, is disposed on the side of the center of curvature of the slab 2
  • the opposite form-giving part namely the internal surface of the opposite wide wall 5 (FIG. 1; 5', FIG. 2) of the mold l, 1', respectively.
  • the form-giving internal surfaces of the narrow walls 6 and 7 of the mold l, l', in accordance with the invention are not parallel to each other, but form an angle with each other; thus, the cross section of the interior of the mold l, 1' forms a regular trapezoid, the basis of which is disposed on the side of the center of curvature of the slab 2.
  • the mold passage is of trapezoidal cross section, with the base of the trapezoid facing ofthe mold, taken on the line 6-6 the center of curvature X. Y (FlGS. l, 2).
  • the trapezoidal nature of the mold passage is also clearly observable from FIGS. 4 and 5.
  • FIG. 4 it can be seen that on the passage from upright to horizontal position, the slab will pass through a phase at which it is of a less pronounced trapezoidal shape; until it reaches rectangular shape, as shown in FIG. 5.
  • the opposite side of the trapezoid base is substantially symmetrically arranged about the central plane W-W of the mold passage; said central plane W-W extends from the mold to the center of curvature X, Y.
  • n to the center of curvature this has been illustrated as a single axis X, Y. Actually, this may be but an approximation, as the curvature may have several adjoining sections of different radii, for example as shown in the patent to Bungeroth and applicant, U.S. Pat. No. 3,324,931, dated June 13, 1967.
  • the term center of curvature herein therefore includes the designation of a central region, as well as a specific axis. Where, however, a definite radius is indicated herein, the center of curvature is substantially an axis.
  • the trapezoidal inclination of the form-giving parts namely the internal surfaces of the narrow sidewalls 6 and 7 of the mold l, l, which may also be referred to as addition for deformation (i)
  • addition for deformation takes into account in advance the subsequent changes of the casting that are brought about by deformation
  • the inward offsetting of the form-giving parts namely of the internal surfaces of the narrow sidewalls 6, 7 (FIGS. 6, 7)
  • the tapering that is generally present at molds for continuous casting.
  • the inclination (i), designated in the foregoing as addition for deformation, of the form-giving parts, namely of the internal surfaces of the sidewall 6, 7, depends on the width of the slab, the speed of casting and, at curved molds, on the casting radius.
  • Example 2 It has been found that when molds are used with a curved axis of mold space, and which is designed for a slab having a width of about 1,500 mm., that there exists a dependency of the aforesaid addition for deformation from the radius of casting in such a manner that at a radius of 8 m., there was an addition for deformation of about 1 percent of the median slab width;
  • the casting speed was 650 mm., per minute during the casting of a normal carbon steel.
  • a continuous casting machine for use in the continuous casting of slabs of rectangular cross section, comprising in combination,
  • guide means guiding each slab and curving it at least after it leaves the mold, at least partially in accordance with a predetermined curvature about a center of curvature into a substantially horizontal direction while the core of the slab is still at least in part liquid,
  • said mold comprising a plurality of walls defining a mold passage of regular trapezoidal cross section with the base of the trapezoid disposed facing said center of curvature, the opposite side of said trapezoid being disposed opposite said space and arranged relative thereto substantially symmetrically about the central plane of said mold passage, said central plane extending from the mold passage to said center of curvature, the end surfaces of said trapezoidal mold being so inclined that said slab deforms to a rectangular shape during passage from the u right to the horizontal direction, sal guide means guiding said slab past the curving of the straightening slab through the initiation of the straightening at least at which latter point said slab will have assumed a shape of rectangular cross section,
  • the width of the slab after it has assumed rectangular cross section being smaller than the length of said base but larger than the length of said opposite side at the beginning of the mold passage.
  • a continuous casting machine as claimed in claim 1, the area of cross section throughout the direction of said mold passage of said slab decreasing in accordance with predetermined tapering of the surface of said wall.
  • a continuous casting machine for wide slabs, said curvature being along a radius R about said center of curvature, the end surfaces of said trapezoidal mold passage being inclined in accordance with an addition of deformation i expressed in percentage of median slab width, R being about 8 meters and i about 1 percent.
  • a continuous casting machine for wide slabs, said curvature being along a radius R about said center of curvature, the end surfaces of said trapezoidal mold passage being inclined in accordance with an addition of deformation i expressed in percentage of median slab width, R being about 6 meters and i about 1.5 percent.
  • a continuous casting machine for wide slabs, said curvature being along a radius R about said center of curvature, the end surfaces of said trapezoidal mold passage being inclined in accordance with an addition of deformation i expressed in percentage of median slab width, R being about 4 meters and i about 2 percent.
  • a continuous casting machine for wide slabs, said curvature being along a radius R about said center of curvature, the end surfaces of said trapezoidal mold passage being inclined in accordance with an addition of deformation i expressed in percentage of median slab width, R being about 2 meters and i about 2.5 percent.
  • the base of the trapezoid being disposed facing the center of said curvature, and the opposite side of said trapezoid being relative thereto arranged substantially symmetrically,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US813171A 1965-05-17 1969-04-03 Continuous casting machine for slabs Expired - Lifetime US3580325A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM65266A DE1255242B (de) 1965-05-17 1965-05-17 Fluessigkeitsgekuehlte Stranggiesskokille fuer die Erzeugung von rechteckigen Straengen

Publications (1)

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US3580325A true US3580325A (en) 1971-05-25

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US813171A Expired - Lifetime US3580325A (en) 1965-05-17 1969-04-03 Continuous casting machine for slabs

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US (1) US3580325A (en:Method)
AT (1) AT256359B (en:Method)
BE (1) BE681098A (en:Method)
DE (1) DE1255242B (en:Method)
GB (1) GB1142168A (en:Method)
NL (1) NL6606696A (en:Method)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4799535A (en) * 1987-04-09 1989-01-24 Herbert Lemper Modular continuous slab casters and the like
US4911226A (en) * 1987-08-13 1990-03-27 The Standard Oil Company Method and apparatus for continuously casting strip steel
US4953614A (en) * 1987-04-09 1990-09-04 Herbert Lemper Modular continuous caster

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2206930A (en) * 1938-07-29 1940-07-09 William R Webster Continuous molding machine
US3358744A (en) * 1965-11-30 1967-12-19 Concast Inc Cooling and apron arrangement for continuous casting molds

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2206930A (en) * 1938-07-29 1940-07-09 William R Webster Continuous molding machine
US3358744A (en) * 1965-11-30 1967-12-19 Concast Inc Cooling and apron arrangement for continuous casting molds

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4799535A (en) * 1987-04-09 1989-01-24 Herbert Lemper Modular continuous slab casters and the like
US4953614A (en) * 1987-04-09 1990-09-04 Herbert Lemper Modular continuous caster
US4911226A (en) * 1987-08-13 1990-03-27 The Standard Oil Company Method and apparatus for continuously casting strip steel

Also Published As

Publication number Publication date
NL6606696A (en:Method) 1966-11-18
BE681098A (en:Method) 1966-10-31
DE1255242B (de) 1967-11-30
GB1142168A (en) 1969-02-05
AT256359B (de) 1967-08-25

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