US3324931A - Method of deflecting towards the horizontal a curved continuously cast descending billet - Google Patents

Method of deflecting towards the horizontal a curved continuously cast descending billet Download PDF

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Publication number
US3324931A
US3324931A US364566A US36456664A US3324931A US 3324931 A US3324931 A US 3324931A US 364566 A US364566 A US 364566A US 36456664 A US36456664 A US 36456664A US 3324931 A US3324931 A US 3324931A
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United States
Prior art keywords
billet
path
mold
horizontal
deformation
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Expired - Lifetime
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US364566A
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English (en)
Inventor
Bungeroth Adolf
Schrewe Hans
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Vodafone GmbH
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Mannesmann 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal

Definitions

  • the invention relates to continuou casting, and relates more particularly to methods of and machines for deflecting towards the horizontal a continuously cast descending billet.
  • the aforesaid methods require, or at least favor, to deform, namely to bend and thereafter to straighten the billet only after the core of the billet is no longer liquid and the billet thus throughout its thickness has completely been solidified.
  • the height and the curvature of the deflecting path is a function of the time required for solidification of the billet and of the casting speed for the desired casting cross section.
  • the transport rolls, the cutters and the straightening devices usually are disposed at a point that is beyond the reach of any liquid portion of the core at any possible casting speed for that machine.
  • the transport rolls and cutters are also arranged only at a point where the billet is throughout its thickness completely solidified.
  • the straightening devices exert their deformation forces at a point of the billet where the billet is only partially solidilied on the interior.
  • the instant invention provides for the continuous casting of a metal billet which is discharged from a mold downwardly in partially solidified form and the billet later on will be solidified completely at a distance from the mold; the deformation in accordance with the invention takes place already within the orbit of that part of the billet in which the core is still liquid, so that the billet is only partially solidified; for arcuate deflecting throughout an arc of the instant invention provides for commencing the deformation already in the arc in such a manner that the rolls of the deflector mechanism, such as the deflector cage are not disposed along a single circular arc of steady radius but along a more complex curve.
  • the rolls define a continuous curved path which is composed of continuous arcuate portions or arcuate segments that are formed each along a circular arc that is described each by a different radius; and the different radii stepwise increase or decrease proportionally, somewhat in the nature of an elliptic or parabolic segment.
  • the radii thus change proportionally with increasing distance of the path from the mold, but such proportional change need not be linearly proportional, but may be proportional in accordance with a different and more complex mathematical relationship, and includes direct proportionality as well an inverse'proportionality.
  • the path proceeds along a continuous curve, but the successive portions thereof are circular arcs formed by different describing radii, and the radii change proportionally successively as one proceeds along the curved path.
  • the selection of the successive radii depends, of course, from the radius of curvature of the curved mold.
  • the deforming namely stressing or swaging must, however, not surpass a harmless degree.
  • the instant invention accomplishes a total deformation of the billet deflecting it into the horizontal within a wide range, and yet all damage to the core is avoided although the deformation takes place at points of the billet which are not completely solidified.
  • the degree of deformation for each step preferably should be the same, but may vary among the steps.
  • the deformation of a billet upon bending for curving and, respectively, upon straightening involves stressing and, respectively, swaging of the most-deformed fiber as compared to the neutral fiber of constant length. This deformation may be expressed in percent of the change in length. Even though in the ensuing description it will be assumed that the neutral fiber even in billets which are only partially solidified, coincides with the longitudinal axis of the billet, and the most-deformed fiber is the outermost fiber, all the following explanations will be valid for the actual position of the neutral and the critically deformed fiber of the billet.
  • the term billet as used herein includes strands of circular, square and rectangular cross section.
  • a billet that is formed in a straight vertical mold, and continues thence on a straight vertical path of solidification is, of course, not subjected to any deformation.
  • the same can be said about a billet that is formed in an arcuate mold and continues thence in a circular peripheral path of solidification, which path is described by the same radius as that of the arcuate mold.
  • Deformation occurs only during bending upon transition from a straight path into an arcuate path and, vice versa, during rectification or straightening of the same billet, and also during transition of the billet from an arcuate path with one radius into other arcuate paths with different radii.
  • the deformations of the billet will be restricted to a short deformation zone which is related to the mutual distance of the pairs of deformation rolls.
  • the restrictions to short deformation zones are rendered possible by the relatively slow billet speed upon high recrystallization speed.
  • FIG. 1 is a schematic elevational view, partly in section.
  • FIG. 2 is a schematic elevational view showing a series of interrelated diagrams.
  • FIG. 1 schematically indicated arcuate mold with an arcuate path a-e for the billet of ellipsoid paraboloid shape.
  • FIG. 1 shows the construction of this path which is formed for example by rolls 11, and is composed of a series of successive continuous arcuate portions a-b, b-c, cd and d-e, and each arcuate portion is formed along a circular arc that is described by a radius. The radii of the succeeding arcuate portions differ from each other.
  • the path commences at the mold with a circular arc of small radius a1, b1, which may, as shown in FIG. 1, coincide with that of the mold.
  • the circular arc runs from a to b peripherally about the same center 1, so that the billet will proceed from a to b without deformation.
  • the path proceeds from b to c as a circular arc with a radius b2, c-2 about the center 2; the transition at the point b is continuous, with the tangents of the two radii b1 and b-2 coinciding at b.
  • the radius b2 is larger than the radius b1.
  • the path continues through the arcuate portion c-d with the increased radius c3, continuously from b-c to cd, and again in a similar manner through the arcuate portion de with the greatly increased radius d-4, continuously through the point d.
  • the center 1 is disposed on the radius b2, the center 2 on the radius c-3, and the center 3 on the radius d-4, so that there is smooth continuation owing to the coinciding of tangents not only as previously described at the point b, but also at the points 0, d and e.
  • the curvatures for the individual arcuate portions flatten out in the direction from a to e.
  • the prolongation of the path from e to f is straight, substantially horizontal, and again at e there is a continuous transition.
  • the billet proceeding from the mold to its horizontal section at e thus starts with a small radius curvature and ends in a straight substantially horizontal path.
  • Item I demonstrates the path of a billet O-ab-cd-e-f, from right to left with a radius R of 3.00 m. as set out in the radius scale shown leftmost in FIG. 2, calibrated in meters.
  • the increasing radii of the arcs a-b, b-c, c-d and d-e in accordance with Table 1 are 3.75, 5.00, 7.50, and 15.00 m., respectively.
  • angles x of the circular arcs may be gleaned from Table 1. The sum of all the angles x amounts to when the billet has been deflected from the vertical head 0 to the horizontal foot e.
  • the length of the arcuate portions between a and e are selected at a length of only .4 m., which in this example is twice the normal distance of about 200 mm. between pairs of deflector rolls in the cage, and if the initial arc O-a in accordance with its angle x of 74.7" would have a length of about 3.9 m., then the length of the path for the billet between 0 and e amounts to merely 5.5 m. and the difference in height between the top of the mold and the horizontal section of the path, as defined by the transport rolls is approximately only 3.00 in.
  • EXAMPLE II Another example is shown in item II of FIG. 2, reference being had to Table 2. It illustrates the modification where a straight mold (instead of an arcuate mold) is being used. In this modification the same method may be used for bending the billet through small increments or partial deformations in each of a series of steps, though at first the series is reversed in order to bring the billet stepwise onto a curvature of only 3.00 m.; thereafter, with the use of a continuous curved .path of the aforesaid type the deflection to the horizontal is completed.
  • the example item II provides, for the sake of safety, for a straight stretch O'-e of about 2.00 m. in which there occurs no deforming.
  • the distance between the upper edge of the mold and the horizontal section e] of the path amounts to about 6.00 m.; and the partially solidified billet at each step is again deformed only for the small increment of 1%.
  • This distance is still for about 2.00 m. smaller than a conventional peripheral path that extends throughout one-fourth of the periphery of an entire circle, shOWn in item III of FIG. 2 which illustrates a prior art device.
  • the length of arc of that prior art path has been chosen in accordance with the greatest length of sump and where at the point a" there occurs the deflection from the peripherally curved portion of the path into the straight portion of the path at a deformation of 1.9% with the billet entirely solidified.
  • the invention furthermore proposes to deform with rolls for bending or straightening, which rolls are not driven, so that the billet essentially will be drawn through the deflector mechanism, such as an adjustable deflector cage or the like; the main pull will be executed by the transport rolls although the deforming rolls may also be energized for aiding in an auxiliary manner the driving pull of the transport rolls.
  • the deflector mechanism such as an adjustable deflector cage or the like
  • R.-rRadius (neutral fiber) of the individual arcuate portions circular segments, in meters.
  • a continuous open-ended relatively highly curved casting mold operable for discharging downwardly and sidewardly a partially solidified continuous metal billet, said billet solidifying completely at a distance from said mold, and means connected with relation to said mold and operable for deforming the descending billet in a series of continuous steps deflecting it in said sideward direction towards the horizontal and defining a continuous path for said billet, said path commencing with the curvature of the mold and including a series of successive arcuate portions interconnected in continuous transition, each arcuate portion being formed along a circular arc described by a radius, the radii of the succeeding arcuate portions differing from each other increasing proportionally successively with increasing distance of the path from the mold, whereby the amount of curvature is decreased in the successive steps after the billet leaves the mold and the billet is being straightened gradually, said radii being so dimensioned that the degree of straightening of any step being below any amount that may be damaging -to the billet.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Rolls And Other Rotary Bodies (AREA)
US364566A 1963-05-03 1964-05-04 Method of deflecting towards the horizontal a curved continuously cast descending billet Expired - Lifetime US3324931A (en)

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DEM0056686 1963-05-03

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US3324931A true US3324931A (en) 1967-06-13

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US (1) US3324931A (no)
AT (1) AT249896B (no)
BE (1) BE646093A (no)
DE (1) DE1250973B (no)
FR (1) FR1387621A (no)
GB (1) GB1068996A (no)
SE (1) SE325378B (no)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3435879A (en) * 1965-01-11 1969-04-01 United Eng Foundry Co Continuous casting method
US3603377A (en) * 1965-08-09 1971-09-07 Georgy Lukich Khim Curvilinear mold and secondary cooling system for continuously cast metal
US3645323A (en) * 1969-01-21 1972-02-29 Mannesmann Ag Roll system for continuous casting machines
US3656536A (en) * 1968-11-28 1972-04-18 Piero Colombo Method for cooling the cast strand in curved-guide continuous casting plants
US3707180A (en) * 1970-01-29 1972-12-26 Mannesmann Ag Method for advancing a continuously cast ingot along a curved withdrawal path
US3729048A (en) * 1970-06-18 1973-04-24 E Gelfenbein Continuous metal-casting plant
US3893503A (en) * 1973-07-24 1975-07-08 Voest Ag Continuous casting plant
US3942582A (en) * 1973-04-27 1976-03-09 Metallurgie Hoboken-Overpelt Manufacture of copper wire rod
US4433717A (en) 1980-04-02 1984-02-28 Nippon Steel Corporation Process for bow type continuous casting
US4465121A (en) * 1981-04-30 1984-08-14 Concast Service Union Ag Method and apparatus for bending a strand in a continuous casting installation for metals, especially steel
US5031687A (en) * 1987-05-16 1991-07-16 Deutsche Voest-Alpine Industrieanlagenbau Gmbh Device for straightening a curved cast steel strand

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT406746B (de) * 1998-11-06 2000-08-25 Voest Alpine Ind Anlagen Verfahren zum stranggiessen von metall sowie stranggiessanlage hierzu
AT507590A1 (de) † 2008-11-20 2010-06-15 Siemens Vai Metals Tech Gmbh Verfahren und stranggiessanlage zum herstellen von dicken brammen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698467A (en) * 1950-06-05 1955-01-04 Edward W Osann Jr Method and apparatus for the continuous casting of metal
US2947075A (en) * 1956-09-21 1960-08-02 Moossche Eisenwerke Ag Method for the continuous casting of metal strip, and strip casting plant for carrying out the method
FR1322519A (fr) * 1961-05-04 1963-03-29 Moossche Eisenwerke Ag Installation pour la coulée continue de métaux
FR1323215A (fr) * 1961-05-05 1963-04-05 Moossche Eisenwerke Ag Procédé et dispositif pour la fabrication de billettes et de fers profilés par coulée continue
GB941290A (en) * 1960-11-18 1963-11-06 Olsson Erik Allan Improvements relating to withdrawing and advancing the casting in continuous casting machines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698467A (en) * 1950-06-05 1955-01-04 Edward W Osann Jr Method and apparatus for the continuous casting of metal
US2947075A (en) * 1956-09-21 1960-08-02 Moossche Eisenwerke Ag Method for the continuous casting of metal strip, and strip casting plant for carrying out the method
GB941290A (en) * 1960-11-18 1963-11-06 Olsson Erik Allan Improvements relating to withdrawing and advancing the casting in continuous casting machines
FR1322519A (fr) * 1961-05-04 1963-03-29 Moossche Eisenwerke Ag Installation pour la coulée continue de métaux
GB929335A (en) * 1961-05-04 1963-06-19 Moossche Eisenwerke Ag Continuous casting plant for metals
FR1323215A (fr) * 1961-05-05 1963-04-05 Moossche Eisenwerke Ag Procédé et dispositif pour la fabrication de billettes et de fers profilés par coulée continue

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3435879A (en) * 1965-01-11 1969-04-01 United Eng Foundry Co Continuous casting method
US3603377A (en) * 1965-08-09 1971-09-07 Georgy Lukich Khim Curvilinear mold and secondary cooling system for continuously cast metal
US3656536A (en) * 1968-11-28 1972-04-18 Piero Colombo Method for cooling the cast strand in curved-guide continuous casting plants
US3645323A (en) * 1969-01-21 1972-02-29 Mannesmann Ag Roll system for continuous casting machines
US3707180A (en) * 1970-01-29 1972-12-26 Mannesmann Ag Method for advancing a continuously cast ingot along a curved withdrawal path
US3729048A (en) * 1970-06-18 1973-04-24 E Gelfenbein Continuous metal-casting plant
US3942582A (en) * 1973-04-27 1976-03-09 Metallurgie Hoboken-Overpelt Manufacture of copper wire rod
US3893503A (en) * 1973-07-24 1975-07-08 Voest Ag Continuous casting plant
US4433717A (en) 1980-04-02 1984-02-28 Nippon Steel Corporation Process for bow type continuous casting
US4465121A (en) * 1981-04-30 1984-08-14 Concast Service Union Ag Method and apparatus for bending a strand in a continuous casting installation for metals, especially steel
US5031687A (en) * 1987-05-16 1991-07-16 Deutsche Voest-Alpine Industrieanlagenbau Gmbh Device for straightening a curved cast steel strand

Also Published As

Publication number Publication date
AT249896B (de) 1966-10-10
SE325378B (no) 1970-06-29
FR1387621A (fr) 1965-01-29
DE1250973B (no) 1967-09-28
GB1068996A (en) 1967-05-17
BE646093A (no) 1964-07-31

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