US3757848A - Method and apparatus to relieve the strain on roller apron segments during continuous casting - Google Patents

Method and apparatus to relieve the strain on roller apron segments during continuous casting Download PDF

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Publication number
US3757848A
US3757848A US00208828A US3757848DA US3757848A US 3757848 A US3757848 A US 3757848A US 00208828 A US00208828 A US 00208828A US 3757848D A US3757848D A US 3757848DA US 3757848 A US3757848 A US 3757848A
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United States
Prior art keywords
casting
apron
stop
movable member
relief element
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Expired - Lifetime
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US00208828A
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English (en)
Inventor
H Scholz
G Bollig
H Grothe
G Otto
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Schloemann AG
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Schloemann 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
    • 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
    • B22D11/14—Plants for continuous casting
    • B22D11/148—Safety arrangements

Definitions

  • the invention relates to a method and an apparatus for relieving the strain on segments of a guide apron, located below the mold in the secondary cooling zone of a continuous casting machine in the event of a sudden cessation of the pouring process, when a part or all of the casting remains in the apron, wherein thespacing of opposing movable parts of the segments of the apron is controlled by the application to said parts of straining forces which press said parts against stops.
  • the apron below the mold is divided into segments comprising upper and lower parts.
  • one part of each segment containing supporting elements such as rollers is arranged to be movable in a direction normal to the casting axis.
  • both parts of each segment, located on opposite sides of the casting may be movable.
  • These segmentparts are usually moved by hydraulic cylinder units.
  • This type of guide apron has a number of drawbacks.
  • the cooling system To prevent the frozen shell of the casting, which is still thin in the upper portion of the apron, from re-melting, the cooling system must not be shut off until the casting is sufficiently solidified. Since, in a curved type casting machine, the cooling water cannot readily run off on the inside radius of the casting, whereas it runsoff at once on the outside radius, the inside of the arc of the casting will be more intensely cooled than the outside. Consequently, warping of the casting caused by'thermal strains may cause the casting to become jammed in the guideway of the apron. When the partly solidified casting is later withdrawn, theend'of the apron is sub,-
  • the thin frozen shell under theeffect of the internalferrostatic pressure may begin to bulge between the supporting elements, which may cause damage to the supporting elements or the apron, when the casting is later withdrawn.
  • a pressure failure in the hydraulic cylinders causes the guiding segments of the apron to open up, particularly when the guiding segments on both sides of the casting are movable. This'results in damage to the apron, particularly in the region close to the mold.
  • An object of the present invention is to eliminate the above described drawbacks and to provide a solution that requires lower casting straining forces, that will retain the movable apron parts in their position if the hydraulic pressure fails, and that nevertheless provides for the relief of overload on the apron which may be caused i.e. bysudden cessation of the metal pouring process.
  • this is achieved in that the slackening of a principal straining force releases a force generated by the casting which causes an overload relief element to be displaced from its position, thereby increasing the spacing between the rollers.
  • This method prevents the apron from being damaged by forces generated by that part of the casting which remains motionless in the roller apron when pouring of metal suddenly ceases, and enables the partly solidified casting to be subsequently withdrawn without damage to'the apron.
  • the apparatus for performing the method is charac terizedby the provision of an overload relief element between the principal straining element and the movable part of the segment of the apron.
  • the principal straining force should press against stops and have the same direction as the ferrostatic pressure of the casting, i.e., at right angles to the casting axis and directed away from it.
  • the principal straining force is thus independent of the amount of the ferrostatic pressure and the spacing between opposing parts of segments of the apron is not changed by a rise or fall of the existing ferrostatic pressure.
  • a constant and invariant cross section is made available to the casting during operation owing to the rigid and inelastic delimitation of the movements of the movable part of the segment of the apron.
  • the guide means which are preferably columns for guiding the movable partsof the I segments, may have stops forsetting the spacing between the parts of the segments. Preferably these stops may have the form of rotatable stepped rings with cooperating and matching counter-members with corresponding projections.
  • Adjustments can be made for varying casting cross sections by rotation of the stepped .rings without having to replace any parts.
  • the-stepped rings may each be provided with a lever arm associated with locking means for locking the stepped rings in the position for the required spacing.
  • all the lever arms associated with the several apron segments of the roller apron may be interconnected for common operation and adjustment. The distance between the parts of the segments of an apron can be adjusted easily and reliably by these features.
  • the wedges may be U- shaped so that they can embrace the columns. This will insure an unobstructed displacement of the overload relief element.
  • the locating force for the overload relief element during normal casting operation is transmitted from the principal straining element through an intermediate member having an inclined wedge face to a movable overload relief element which has a correspondingly inclined wedge face for cooperation with the intermediate member.
  • another advantageous arrangement may consist in transmitting the locating force for the overload relief element from the principal straining element to the overload relief element via a cranked lever.
  • FIG. 1 is a cross section of a portion of a segment of a roller apron taken on the line I I in FIG. 3.
  • FIG. 2 is a front elevation of the arrangement for adjusting to a different casting cross section, and of an overload relief element.
  • FIG. 3 is a side elevation of a segment of the roller apron.
  • FIG. 4 is a horizontal section on the line IV IV of FIG. 2, and
  • FIG. 5 is a partial section corresponding to that of FIG. 1, showing a modified arrangement of the principal straining element.
  • a frame 1 carries the fixed apron segment part 2 and the movable apron segment part3, which is slidable on columns 9, of one segment of a roller apron.
  • Part 2 of the segment comprises two end plates 4 mounted on frame 1, said end plates carrying bearings 5 for guide rollers 6.
  • plates or other guide means may be used.
  • Affixed to each end plate 4 is a guide sleeve 7, and cross members 8 connect the end plates 4.
  • a pin 10 locates the column 9 inside the sleeve 7 which extends at right angles to the path of the casting.
  • a further sleeve 11 which is secured to movable part 3 of the illustrated segment of the roller apron.
  • Part 3 of the segment also includes end plates 13 carrying bearings 14 for rollers 15.
  • Cross members 12 connect the end plates 13.
  • a straining element in the form of a hydraulic cylinder unit 18.
  • the piston rod 17 of this cylinder unit is attached to a bracket 16 secured to the sleeve 7.
  • Affixed to the other end of the hydraulic cylinder 18 is a wedge 19.
  • a pin 20 is fitted into this wedge 19, the projecting ends of the pin serving as pivots 21 for sliding blocks 22.
  • the sleeve 11 is provided with brackets 23, 24
  • a laterally slidably displaceable overload relief element 26 in the form of a wedge.
  • the wedge face of this element 26 facing the wedge 19 has the same angle of slope as the opposed wedge face of the wedge 19.
  • the element 26 is forked and straddles the column 9 which has plane areas machined into its sides in this region.
  • the side of the element 26 which faces away from the top of the sleeve 11 is likewise provided with an inclined wedge face which slopes in relation to that side of said element which rests on the top of the sleeve 11.
  • Located above the overload relief element 26 is yet another wedge-shaped element 27 of which the wedge face cooperates with the inclined wedge face of the overload relief element 26 that faces away from the sleeve 11.
  • This element 27 is U-shaped and also embraces the column 9 which has alsoplane areas machined into its sides in this region.
  • an adjusting screw 29 permits the lateral position of element 27 to be adjustably varied and fixed, which thereby determines precisely the distance between the opposing parts 2 and 3 of the segment of the roller apron.
  • the adjusting screw 29 is held in a member 28.
  • Mounted on the column 9 above the member 28 is a stepped ring 30 with several steps 30.
  • the ring 30 is rotatable on the column 9.
  • a groove 33 is machined into the upper end of the column 9 and this. groove is engaged by a divided cooperating stepped ring 34.
  • the ring 30 is rotated into a different position and, in cooperation between the steps 30' of ring 30 and the corresponding matching projections 35 on ring 34, the cross section available for the casting is determined.
  • the stepped ring 30 carries a lever arm 31 which may be held by locking means 32 in specific positions corresponding to the required casting cross sections.
  • the arms 31 associated with the several segments of the apron may be interconnected to permit all the segments along the length of the apron to be adjusted at once.
  • Straps 36 which extend upwards to the member 28 are attached to each side of the sleeve 11. In the area of the member 28 each strap 36 has an elongated hole 37 for the reception of a pin 38 fitted to the-member 28. The straps ensure that the member 28 is pulled down when movable part 3 of the segment descends so that member 28 does not remain behind because of its asymmetric shape.
  • the overload relief elements are protected against fouling by covers 39.
  • pressure applied by the hydraulic cylinder 18 presses the sliding blocks 22 upwards against the brackets 23 which are attached to the sleeves ll of movable part 3 of the segment of the roller apronand thereby presses the sleeve 1 1 against the wedges 26 and 27. These in turn press against the member 28 and the stepped ring 30 and 34.
  • the wedge 19 moves the overload relief element 26 towards the column 9, thereby causing the sleeve 11 to be locked in place by the pressure applied by the hydraulic cylinder 18.
  • FIG. 5 shows a different embodiment of the movable part 3 of a segment of the roller apron.
  • Frame 1 and the fixed part 2 of the apron segment are identical with the arrangement illustrated in FIGS. 1 and 3.
  • the slidably movable guide sleeve 11 is provided with brackets 42.
  • the piston rod 17 of the hydraulic cylinder 18 is attached to these brackets 42 by a pin 41.
  • the other end of the hydraulic cylinder 18 is connected by a pin 44 to a cranked lever 43 which at one end is linked to a mounting 51 by pins 58.
  • the mounting 51 is slidably fitted to the column9 and bears against a pin 55 on the end of column 9.
  • the mounting 51 is attached to cross members 52 and straddles a wedge-shaped element 27, an overload relief element 26 and a rotatable stepped ring 30.
  • a ring 56 surrounds the pin 55 and is locked in position by a pin 57.
  • the element 27 is slidably displaceable by means of an adjusting screw 29.
  • the cranked lever 43 and'the overload relief element 26 are connected by straps 47and pins 45 and 46.
  • the distance between therollers 6 and in the segments of the apron is maintained by spacing pins 50 which cooperate with the stepped ring 30.
  • the ring 30 is rotated into the desired position and the slidably movable part 3 of the segment is drawn towards the mounting 51 by the hydraulic cylinder 18.
  • the force acting on the cranked lever 43 presses the overload relief element 26 in the direction of column 9 against the inclined wedge face of the element 27.
  • the exact position of the elements 26 and 27 can be adjusted by the screw 29.
  • the sleeve 1 1 is forced against the.
  • the overload relief element 26 can be moved sideways towards cylinder 18 by applying the pressure to the piston in cylinder 18 in the opposite direction.
  • the oil pressure in cylinder 18 can be relieved when the force which is generated by the casting within the apron segment exceeds a certain amount. This force will then push the element 26 sideways towards cylinder 18 thereby increasing the distance between rollers 6 and 15.
  • apron which guides the casting through a secondary cooling zone
  • said apron comprising a plurality of segments, each having opposed members engaging opposed surfaces of the casting, with at least one of said members movable with respect to the other member to accommodate castings of different thickness
  • means for relieving excessive forces on said opposed members in I the event of interruption of the casting operation comprising a stop to limit the movement of said movable member, an overload relief element located adjacent said stop, means to apply pressure to said movable member to move it toward and hold it against said stop and to simultaneously move said overload relief element to lock said movable-member in adjusted position, and means actuated by said movable member upon release of said pressure and upon application by said casting of excessive forces thereto to move said overload relief element to release saidmovable mem her to permit further movement toward said stop.
  • Apparatus as claimed in claim 1 in which said means to apply pressure to said movable member includes a first wedge surface, and in which said overload relief element includes a second wedge surface located to be engaged by said first wedge surface in sliding relationship.
  • said stop includes a first ring rotatably mounted on said column and having steps therein, and a second ring rotatably mounted on said column and having projections thereon to selectively engage said steps to adjust the effective position of said stop.
  • Apparatus as claimed in claim 1 in which said means to apply pressure to said movable member includes a cranked lever, and a link connecting one arm of said lever to said overload relief element.
  • apron which guides the casting through a secondary cooling zone
  • said apron comprising a plurality of segments, each having opposed members engaging pposed surface of the casting, with at least one of said members movable with respect to the other member to accommodate castings of different thickness

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)
US00208828A 1970-12-19 1971-12-16 Method and apparatus to relieve the strain on roller apron segments during continuous casting Expired - Lifetime US3757848A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2062792A DE2062792C3 (de) 1970-12-19 1970-12-19 Stützführungsrahmen fur StranggieBanlagen

Publications (1)

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US3757848A true US3757848A (en) 1973-09-11

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US00208828A Expired - Lifetime US3757848A (en) 1970-12-19 1971-12-16 Method and apparatus to relieve the strain on roller apron segments during continuous casting

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US (1) US3757848A (de)
JP (1) JPS4942223B1 (de)
AT (1) AT324596B (de)
AU (1) AU468890B2 (de)
BE (1) BE776900A (de)
CA (1) CA941127A (de)
DE (1) DE2062792C3 (de)
FR (1) FR2118166B1 (de)
GB (1) GB1379034A (de)
IT (1) IT943916B (de)
NL (1) NL7117349A (de)
SE (1) SE382926B (de)
ZA (1) ZA718441B (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920065A (en) * 1973-08-27 1975-11-18 United States Steel Corp Curved roll rack
US3946798A (en) * 1973-04-10 1976-03-30 Kobe Steel, Ltd. Cast piece guide roll segment in continuous casting equipment
US4007822A (en) * 1975-03-25 1977-02-15 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Strand guiding means to be used in a continuous casting plant
US4034797A (en) * 1976-01-09 1977-07-12 United States Steel Corporation Remote-controlled infinitely adjustable roll stand
US4058154A (en) * 1976-09-23 1977-11-15 Concast Incorporated New York Guiding and supporting means for continuously cast metal strand
US4079777A (en) * 1976-01-27 1978-03-21 Vereinigte Osterreichische Eisen- Und Stahlwerke - Alpine Montan Aktiengesellschaft Apparatus for extracting a starter bar and for supporting and extracting a cast strand
US4090549A (en) * 1974-07-12 1978-05-23 United States Steel Corporation Method and mechanism for determining forces on a solidifying casting
US4116262A (en) * 1975-11-12 1978-09-26 Vereinigte Osterreichische Elsen- Und Stahlwerke - Alpine Montan Aktiengesellschaft Arcuate supporting and guiding construction for continuously cast strands
US4122888A (en) * 1975-04-30 1978-10-31 Vereinigte Osterreichische Eisen- Und Stahlwerke - Alpine Montan Aktiengesellschaft Method of guiding a cast strand and arrangement for carrying out the method
US4146083A (en) * 1975-10-16 1979-03-27 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Arcuate supporting and guiding construction for continuously cast strands
US4223719A (en) * 1976-12-08 1980-09-23 Concast Ag Roller apron for a continuous casting installation
US4252180A (en) * 1978-02-15 1981-02-24 Demag Aktiengesellschaft Pressure relief apparatus for the supporting beam for metal strand casting plants, particularly curved steel strand casting plants
US4362206A (en) * 1979-06-28 1982-12-07 Voest-Alpine Aktiengesellschaft Supporting and guiding stand arrangement to be used in a continuous casting plant
WO2001089742A1 (de) * 2000-05-23 2001-11-29 Sms Demag Aktiengesellschaft Verfahren und einrichtung zum anstellen eines oder mehrerer rollensegmente in einer stranggiessanlage für metalle, insbesondere für stahlwerkstoffe

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT343303B (de) * 1975-10-01 1978-05-26 Voest Ag Stutz- und fuhrungsbogen fur gussstrange, insbesondere fur brammengussstrange
AT340082B (de) * 1975-10-29 1977-11-25 Voest Ag Strangfuhrung an einer stranggiessanlage
DE2740221C2 (de) * 1977-09-07 1984-09-06 Concast AG, Zürich Stützführung in einer Stranggießanlage
DE2941373A1 (de) * 1979-10-12 1981-04-23 Schloemann-Siemag AG, 4000 Düsseldorf Anstellvorrichtung fuer die stuetzfuehrung in einer stranggiessanlage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB950882A (en) * 1961-05-01 1964-02-26 Davy & United Eng Co Ltd Improvements in or relating to roll adjustment apparatus
US3263284A (en) * 1963-12-20 1966-08-02 United States Steel Corp Constant-pressure pinch rolls for continuous casting
DE2023002A1 (de) * 1969-05-13 1970-11-19 Concast Ag Vorrichtung zum Fuehren eines Stranges in der Sekundaerkuehlzone beim Stranggiessen in Bogenanlagen
US3550675A (en) * 1967-01-27 1970-12-29 Schloemann Ag Continuous casting plant having adjustable strand guide means
US3577757A (en) * 1966-04-06 1971-05-04 Achenbach Sohne Gmbh Roller frame structure with one or more pressing devices for maintaining constant the gap between the rollers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB950882A (en) * 1961-05-01 1964-02-26 Davy & United Eng Co Ltd Improvements in or relating to roll adjustment apparatus
US3263284A (en) * 1963-12-20 1966-08-02 United States Steel Corp Constant-pressure pinch rolls for continuous casting
US3577757A (en) * 1966-04-06 1971-05-04 Achenbach Sohne Gmbh Roller frame structure with one or more pressing devices for maintaining constant the gap between the rollers
US3550675A (en) * 1967-01-27 1970-12-29 Schloemann Ag Continuous casting plant having adjustable strand guide means
DE2023002A1 (de) * 1969-05-13 1970-11-19 Concast Ag Vorrichtung zum Fuehren eines Stranges in der Sekundaerkuehlzone beim Stranggiessen in Bogenanlagen

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946798A (en) * 1973-04-10 1976-03-30 Kobe Steel, Ltd. Cast piece guide roll segment in continuous casting equipment
US3920065A (en) * 1973-08-27 1975-11-18 United States Steel Corp Curved roll rack
US4090549A (en) * 1974-07-12 1978-05-23 United States Steel Corporation Method and mechanism for determining forces on a solidifying casting
US4007822A (en) * 1975-03-25 1977-02-15 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Strand guiding means to be used in a continuous casting plant
US4122888A (en) * 1975-04-30 1978-10-31 Vereinigte Osterreichische Eisen- Und Stahlwerke - Alpine Montan Aktiengesellschaft Method of guiding a cast strand and arrangement for carrying out the method
US4146083A (en) * 1975-10-16 1979-03-27 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Arcuate supporting and guiding construction for continuously cast strands
US4116262A (en) * 1975-11-12 1978-09-26 Vereinigte Osterreichische Elsen- Und Stahlwerke - Alpine Montan Aktiengesellschaft Arcuate supporting and guiding construction for continuously cast strands
US4034797A (en) * 1976-01-09 1977-07-12 United States Steel Corporation Remote-controlled infinitely adjustable roll stand
US4079777A (en) * 1976-01-27 1978-03-21 Vereinigte Osterreichische Eisen- Und Stahlwerke - Alpine Montan Aktiengesellschaft Apparatus for extracting a starter bar and for supporting and extracting a cast strand
US4058154A (en) * 1976-09-23 1977-11-15 Concast Incorporated New York Guiding and supporting means for continuously cast metal strand
US4223719A (en) * 1976-12-08 1980-09-23 Concast Ag Roller apron for a continuous casting installation
US4252180A (en) * 1978-02-15 1981-02-24 Demag Aktiengesellschaft Pressure relief apparatus for the supporting beam for metal strand casting plants, particularly curved steel strand casting plants
US4362206A (en) * 1979-06-28 1982-12-07 Voest-Alpine Aktiengesellschaft Supporting and guiding stand arrangement to be used in a continuous casting plant
WO2001089742A1 (de) * 2000-05-23 2001-11-29 Sms Demag Aktiengesellschaft Verfahren und einrichtung zum anstellen eines oder mehrerer rollensegmente in einer stranggiessanlage für metalle, insbesondere für stahlwerkstoffe
KR100738355B1 (ko) 2000-05-23 2007-07-12 에스엠에스 데마그 악티엔게젤샤프트 금속, 특히 강 재료의 연속 주조 설비에서 하나 이상의 롤세그먼트를 조정하는 방법 및 장치

Also Published As

Publication number Publication date
JPS4942223B1 (de) 1974-11-13
AU468890B2 (en) 1976-01-29
DE2062792B2 (de) 1978-06-22
CA941127A (en) 1974-02-05
AT324596B (de) 1975-09-10
DE2062792C3 (de) 1979-02-15
BE776900A (fr) 1972-04-17
GB1379034A (en) 1975-01-02
FR2118166B1 (de) 1974-06-21
SE382926B (sv) 1976-02-23
NL7117349A (de) 1972-06-21
IT943916B (it) 1973-04-10
DE2062792A1 (de) 1972-06-22
AU3713671A (en) 1973-06-28
ZA718441B (en) 1972-09-27
FR2118166A1 (de) 1972-07-28

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