US3648504A - Method for bending and straightening a cast bar and plant for carrying out such method - Google Patents

Method for bending and straightening a cast bar and plant for carrying out such method Download PDF

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Publication number
US3648504A
US3648504A US57455A US3648504DA US3648504A US 3648504 A US3648504 A US 3648504A US 57455 A US57455 A US 57455A US 3648504D A US3648504D A US 3648504DA US 3648504 A US3648504 A US 3648504A
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US
United States
Prior art keywords
bending
rolls
roll
bar
stand
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Expired - Lifetime
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US57455A
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English (en)
Inventor
Rudolf Schoffmann
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Voestalpine AG
Voest AG
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Voestalpine 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
    • B22D11/1226—Accessories for subsequent treating or working cast stock in situ for straightening strands

Definitions

  • curved supporting and guiding means are arranged in succession to the casting mould, and the guiding means are, in turn, followed by bending and straightening apparatuses so that the cast bar may run out either horizontally and straight or in an inclined plane.
  • the cast bar After the cast bar has been bent and straightened, it may be guided on by a curved roller table or in a roller guide which may be advantageous when hollow bars are cast.
  • the bending and straightening apparatuses that have been used so far have various disadvantages; above all the bending forces acting upon the bar in front of and behind the bending and straightening zone proper create bending moments which cause the cast bar to be torn. If these bending moments act upon the bar in the area between the end of the stationary bar guiding means and the bending and straightening apparatus, cracks may occur at the bar surface or existing cracks may be enlarged. Also the bar guiding means may be overstressed; therefore the construction of the bar guiding means had to be very solid, i.e. overdimensioned. When bending moments act upon the bar where it issues from the bending and straightening apparatus, the bar may likewise be cracked and/or deformed, e.g. distorted or warped. These disadvantages of known plants for bending and straightening cast bars become particularly obvious when the core of the cast bars is still liquid.
  • the invention is aimed at creating a method and a plant for bending and straightening a cast bar in which the cast bar remains free from bending moments in front of and behind the bending and straightening zone and with which the described disadvantages of the known plants are avoided.
  • the method according to the invention for bending and straightening a bar issuing from a stationary, curved bar guiding means of a continuous casting plant by means of a bending and straightening apparatus comprising at least two bending and straightening rolls, a reaction roll and, if desired, pulling rolls, is characterized in that the bending roll following the reaction roll is re-adjusted in dependence on a deviation from a desired pressure-value as indicated by at least one pressure gauge arranged behind the bending apparatus and sensing bending moments acting upon the cast bar, in order to off-set the deviation from the desired value, whereupon, in case this measure is not effective, the bending rolls are slewn around a horizontal rotation axis in a direction contrary to that in which said bending roll is re-adjusted, which measure guarantees that absolutely no bending moments are exerted on the cast bar leaving the bar guiding means in the area before the reaction roll nor on the bent and straightened cast bar leaving the last bending roll.
  • the bending apparatus including the reaction roll, the bending rolls and the pulling rolls is slewn as a unit.
  • the invention further relates to a plant for carrying out the method comprising at least two bending and straightening rolls capable of being individually tightened, a reaction roll, and, if desired, pulling rolls, which plant is characterized in that the bending rolls are slewable around a common horizontal axis,
  • reaction roll, the bending rolls and the pulling rolls are united in a common stand, the stand being slewable in relation to the foundation.
  • the slewing axis of the stand is arranged in the vicinity of the reaction roll axis so that, when the stand is slewn, the relative movement of the reaction roll takes place about tangentially to the cast bar.
  • the slewing device for the stand is arranged at that side of the stand from where the bar issues;
  • the pressure gauge is built in between the stand frame and the slewing device; at least one pair of the bending rolls and the corresponding pulling rolls are formed as shaping rolls so that the stand is designed as a combined pulling, straightening and rolling stand.
  • the bending rolls and the pulling rolls may be driven individually and hydraulically tightened.
  • FIG. l is a vertical sectional view
  • FIG. 2 is a front view, partly in section, of a combined pulling, straightening and rolling stand.
  • the cast bar ll leaves the stationary, curved bar guiding means 2 having the radius R and is guided into the pulling, straightening and rolling stand 3, where it is bent into horizontal direction and subsequently drawn out.
  • the cast bar 1' which is bent into horizontal direction is transported on in horizontal direction over a stationary roller table 9.
  • the reaction roll 4, the bending and straightening roll 5, the pulling roll 6, the pulling roll 7 and the bending and straightening roll 8 are arranged in a stand frame 15 designed in two parts.
  • the rolls are mounted in insert pieces denoted with numerals 10, ll, 112, B3 and M, Numeral 1o denotes a releasable cap connection, and numerals W, W, 19 denote the cross connections for the stand frame 15.
  • the reaction roll 41 may be actuated by a mechanical adjustment device 20 for adaptation to varying bar thicknesses.
  • the rolls 5, 6 and 8 are hydraulically tightened by means of devices 21, 22, 23.
  • the bending apparatus including the reaction roll 4, the bending rolls 5, 8 and the pulling rolls 6, 7 is slewable as a unit; pins 24 25 which are arranged horizontally on the frame are inserted into bearing lugs 24a, 25a which are cast integral with the frame and mounted in bearings 24!), 25b of bearing blocks Me, 25c fixed to the foundation 30.
  • the axis 26 of the pins 2A, 25 lies parallel to and near the axis of the roll A.
  • a console 27 is provided at the delivery side of the frame 15 which console serves to support the stand 3 against an adjustment means 29 fixed to the foundation 30.
  • a pressure gauge 28 is built in between the console 27 and the slewing device 29.
  • An adjustable guiding means 3i is provided for introducing the cold bar.
  • Numerals 32, 33 denote spacers which serve to support the insert pieces ll, 12 and l3, M, respectively and, when the stand is used eg as rolling stand, to maintain an equal distance between the rolls during operation.
  • the curve of the cast bar l is changed in the area between the rolls 4i and 8 and furthermore the angle 01 is changed which is enclosed by the cast bar 1 and the horizontal line in the area of the roll 4.
  • the angle 0 cannot freely be changed so that undesired bending moments act upon the cast bar l in the area before the roll 41; these bending moments cause uncontrolled forces which on the one hand are exerted upon the bar guiding means and on the other hand are responsible for the cast bar being torn unless specific measures are taken to avoid these shortcomings.
  • a pressure gauge 28 Any moment acting upon the cast bar 1 on account of the bar guiding means 2 and from said cast bar via the rolls 4i, 5 and 8 upon the stand 3 is registered according to the invention by a pressure gauge 28.
  • This pressure gauge 28 which is built in between the console 27 of the stand frame 115 and the adjustment means 29 thus indicates those forces which occur outside the bending area proper.
  • the pressure gauge 28 and the adjustment means 29 for slewing the stand 3 around the pins 24, 25 should be arranged at a location as far as possible away from the pins 24, 25 so as to ensure an adequate sensibility of the pressure gauge.
  • the pressure gauge 28 is adjusted in a manner that e.g. its desired value (zero value) corresponds to an ideal operational condition, in which the cast bar 1 in the area between the bar guiding means 2 and the roll 4, and the bent cast bar 1 in the area between the roll 8 and the roller table 9 remain free from bending stresses.
  • a deviation from the desired value indicated by the pressure gauge 28 is used for changing the position of the rolls 5, 8 in relation to the bar 1, until the desired value (zero value) is reached again, i.e. until the bar guiding means 2 is free from bending moments.
  • the position of the roll 4 remains practically unchanged in this process.
  • the cast bar 1 may be adapted to the shape and position of the roller table 9 in a manner that these bending stresses are eliminated and the indicator of the pressure gauge 28 again shows the desired zero value; then the roller table 9 is loaded only with the own weight of the bent cast bar 1'.
  • the slewing device 29 is additionally actuated, which device is preferably designed as hydraulically operable cylinder.
  • the adjustment device 29 serves to slew the stand 3 around the horizontal axis 26 in a direction contrary to that in which the roll 5 had been displaced and with greater speed so that the displacement of the roll 5 which had been carried out in the wrong direction is rapidly remedied.
  • the correct measure is initiated by slewing the stand 3 and when the pressure gauge 28 again indicates the desired zero value the displacement of the roll 5 and slewing of the stand 3 is terminated.
  • the reason for this deviation may be two fold.
  • the rolls 5, 8 may stand higher than would be appropriate for the bending line; then a moment is created in the bar guide 2 which exerts additional forces on the roll 5.
  • the bar 1 leaving the plant according to the invention is insufficiently straightened and therefore is lifted off the roller table 9; then, too, a moment is created which is indicated as a pressure increase by the pressure gauge 28.
  • the automatic control at first causes the roll 5 to be lifted. If after this measure the indicator does not go back to the desired zero value and the pressure is further increased, the rolls 5, 8 had been positioned too high in relation to the bending line. As soon as the indicator transgresses a predetermined marginal value, the
  • stand 3 is additionally slewn in downward direction contrary to the movement of the roll 5; by this measure a bending moment which on account of the bar guiding means 2 had acted upon the cast bar 1 and had caused the deviation of the pressure gauge 28 is gradually reduced until the bar 1 is free from bending stresses. If, however, the deviation had been caused by the bar being insufficiently straightened, the indicator will be brought back to the desired zero value simply by moving the roll 5 in upward direction; in this case it is not necessary to slew the stand.
  • the pressure gauge 28 indicates minus values, i.e. a pressure decrease or relief from load of the stand, the automatic control would obviously effect a lowering of the roll 5 and later, if this measure should prove to be wrong, slewing of the stand 3 in upward direction until the indicator goes back to the desired zero value.
  • the invention is also applicable when more than two bending and straightening rolls 5, 8 are provided. It is also possible to employ several pressure gauges for controlling the re-adjustment when the stand 3 is supported against the foundation 30 at several points.
  • the described automatic control of the movement of the roll 5 and of the slewing movement of the stand 3 may be employed with particular advantage in the combined pulling, straightening and rolling stand which is illustrated in the drawing.
  • the pulling rolls 6, 7 for drawing the bar are coordinated to the bending rolls 5, 8.
  • the rolls 5, 6 are designed as shaping rolls so that the cast bar may be shaped immediately after its solidification.
  • the rolls 7, 8 may likewise be designed as deformation rolls, either alone or in addition to the rolls 5, 6.
  • the shaping rolls 5, 6 will displace themselves in vertical direction because the roll engaging with the warmer bar side will enter more deeply into the material.
  • a method for bending and straightening a cast bar in a continuous casting plant comprising passing said bar leaving a stationary curved bar guiding means through a bending and straightening apparatus including a reaction roll and at least two bending rolls, the steps of re-adjusting one of said bending rolls following said reaction roll as soon as at least one pressure gauge arranged behind said bending and straightening apparatus and adapted for sensing bending moments acting upon said cast bar indicates a deviation from a desired value so as to cancel said deviation and, in case said re-adjustment remains ineffective, slewing said bending rolls around a horizontal axis in a direction contrary to that in which said bending roll has been readjusted in order to keep said cast bar free from bending moments both when it passes from said guiding means to said reaction roll and when it is delivered from the last bending roll in bent and straightened condition.
  • Apparatus for bending and straightening a cast bar in succession to a continuous casting plant having a stationary, curved bar guiding means comprising a reaction roll and at least two bending rolls, at least one pressure gauge arranged behind said bending rolls and adapted to register bending moments acting upon said cast bar leaving said stationary curved bar guiding means in the area before said reaction roll and on said bent and straightened cast bar leaving the last bending roll, which bending moments are indicated as deviations from a desired value, means for re-adjusting one of said bending rolls which is arranged behind the reaction roll in response to deviations tending to restore said desired value, and a slewing device for slewing said at least two bending rolls around a common horizontal axis in a direction contrary to that in which said one bending roll is re-adjusted.
  • Apparatus for bending and straightening a cast bar in succession to a continuous casting plant having a stationary curved bar guiding means comprising a stand of horizontal rolls including a reaction roll near bar input side of said stand, at least first and second bending rolls, and a number of pulling rolls mounted in a common frame, at least one pressure gauge adjacent to bar output side of said stand, adapted to register bending moments acting on said bar on either side of said stand as deviations from a desired value, means for readjusting said first bending roll in response to deviations, tending to restore said desired value, and means for slewing said stand around a horizontal axis arranged in the vicinity of the reaction roll axis so that slewing of said stand will produce a relative movement of said reaction roll in a direction substantially tangential to said cast bar.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
US57455A 1969-07-25 1970-07-23 Method for bending and straightening a cast bar and plant for carrying out such method Expired - Lifetime US3648504A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT719069A AT301070B (de) 1969-07-25 1969-07-25 Verfahren zum Biegen und Richten eines Gußstranges und Vorrichtung zur Durchführung des Verfahrens

Publications (1)

Publication Number Publication Date
US3648504A true US3648504A (en) 1972-03-14

Family

ID=3593580

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US57455A Expired - Lifetime US3648504A (en) 1969-07-25 1970-07-23 Method for bending and straightening a cast bar and plant for carrying out such method

Country Status (11)

Country Link
US (1) US3648504A (de)
JP (1) JPS4842347B1 (de)
AT (1) AT301070B (de)
BE (1) BE753626A (de)
CH (1) CH525050A (de)
DE (1) DE2032672A1 (de)
ES (1) ES381675A1 (de)
FR (1) FR2053147B1 (de)
GB (1) GB1260450A (de)
SE (1) SE359243B (de)
SU (2) SU420155A3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4480680A (en) * 1979-10-01 1984-11-06 Voest-Alpine Aktiengesellschaft Bow-type continuous casting plant for strands
US4633697A (en) * 1985-08-16 1987-01-06 Mesta Engineering Company Plate levelling machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2091789A (en) * 1934-12-11 1937-08-31 Hedwig Maussnest Sheet straightening machine
US2391419A (en) * 1944-06-02 1945-12-25 Edward W Voss Roller leveler

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2091789A (en) * 1934-12-11 1937-08-31 Hedwig Maussnest Sheet straightening machine
US2391419A (en) * 1944-06-02 1945-12-25 Edward W Voss Roller leveler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4480680A (en) * 1979-10-01 1984-11-06 Voest-Alpine Aktiengesellschaft Bow-type continuous casting plant for strands
US4633697A (en) * 1985-08-16 1987-01-06 Mesta Engineering Company Plate levelling machine

Also Published As

Publication number Publication date
FR2053147A1 (de) 1971-04-16
GB1260450A (en) 1972-01-19
FR2053147B1 (de) 1974-09-20
DE2032672A1 (de) 1971-02-04
SU379075A3 (de) 1973-04-18
AT301070B (de) 1972-08-25
SE359243B (de) 1973-08-27
ES381675A1 (es) 1973-04-16
BE753626A (fr) 1970-12-31
SU420155A3 (ru) 1974-03-15
JPS4842347B1 (de) 1973-12-12
CH525050A (de) 1972-07-15

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