US3651857A - Device for supporting and cooling continuously cast strands of metal - Google Patents

Device for supporting and cooling continuously cast strands of metal Download PDF

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Publication number
US3651857A
US3651857A US50465A US3651857DA US3651857A US 3651857 A US3651857 A US 3651857A US 50465 A US50465 A US 50465A US 3651857D A US3651857D A US 3651857DA US 3651857 A US3651857 A US 3651857A
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Prior art keywords
supporting
members
strand
cross
adjacent
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Expired - Lifetime
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US50465A
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English (en)
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Wilhelm Koch
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Mannesmann Demag AG
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Demag AG
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Priority claimed from DE19691952633 external-priority patent/DE1952633C3/de
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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

Definitions

  • ABSTRACT A supporting device for supporting cast strands of metal as [30] Foreign Apphcaflon Pnomy Dam they are fed from a casting mold, comprises a supporting Oct. 18, 1969 Germany P 19 52 633,1 frame which is adapted to be positioned adjacent the casting mold and which carries a plurality of longitudinally spaced 521 U.S.Cl ..164/283, 164/89, 134/83, rows of transversely n ing ro m mbers- Each cross 134/199 member carries a plurality of supporting members in the fonn 51 Int.
  • This invention relates in general to continuous casting apparatus, and in particular, to a new and useful supporting device particularly for cast steel strands which includes a plurality of supporting elements with spray means for spraying a cooling fluid in the vicinity of a casting which is supported.
  • the cast strand solidifies in the continuous casting mold only to the extent of having, upon leaving the mold, a relatively thin skin consisting of cast metal below the point of liquidity.
  • the strand easily tends to bulge at the supporting elements which for example, may comprise either rollers, rolls or plates.
  • Such bulging entails the danger of the strand breaking and the bulges increase the transport resistance, the individual resistances adding up to a total resistance which must be overcome by the strength of the strand transporting machine. Therefore the greater the friction at the bulges, the greater the drawing resistance and the greater the driving output of the transporting machine.
  • the stress on the strand skin will be great and this skin is usually weak to start with and this could produce particularly serious consequence. In practice therefore, an increase in the casting speed and an increase in output are possible in rare cases.
  • rollers It is known to dispose through rollers at the broad side of the strand at a location below the continuous casting mold for instance, where slabbing strands are involved. The greater the roller diameter selected, the greater the distance between the several rollers. It is also known to attach one or two such rollers directly to the continuous casting mold while the others are mounted in a stationary supporting device. The roller spacings must be chosen so that there is the possibility of providing a number of spray nozzles to cool the strand appropriately between each two rollers over the entire width of the strand. It is also known to provide several metal plates below the continuous casting mold, so-called cooling shoes, which support the strand at the sides of its profile.
  • the metal plates form closed cooling boxes with a definite system of plate arrangement in order to cool the latter as well as bring coolant to the strand in addition.
  • the metal plates cover the strand to such an extent that the desired cooling effect fails to materialize for reasons of the so-called Leidenfrost phenomenon.
  • the coolant which gets between the strand surface and the metal plate through the internal holes evaporates, thereby developing an insulation effect which is a known attribute of water vapor. Fresh coolant can flow only under difficulties and the developed vapor remains too long, therefore, to cause a cooling effect to the desired degree.
  • the configuration of the big rollers provided also brings with it the disadvantage of having to dimension the mutual spacing of the stationary shafts by a correspondingly greater amount as a function of the diameter of the big rollers. Therefore, in reality, two difficulties have not been overcome by the known solution.
  • the one relates to the transmission of large forces to the strand skin, by the larger diameter rollers as the size of the honeycomb pattern increases and the other disadvantage relates to the possibility of cooling the strand which ultimately can only be drawn readily if the strand skin growth can be improved so that the greater resistance due to bulging disappears. Accordingly, the emphasis in the known object is on the support neglecting the cooling aspect.
  • a supporting device which is capable of distributing the supporting forces even better and above all takes into a better account the possibilities for cooling.
  • the supporting elements are arranged on transverse members or cross shafts at definite spaced relationship in longitudinal rows of shafts with the supporting members on adjacent shafts being disposed between two adjacent supporting members of the next adjacent row.
  • the dimensions of each supporting element is selected as small as possible and partial lengths of each cross support or shaft is kept free for the inclusion of a cooling device. This provides a close checker boardlike support and small gaps remain between the supporting elements which permit the dissipation of the steam from the cooling liquid.
  • One advantage is that the strand is better supported by unit of area due to the more densely staggered supporting elements so that strand is subjected to less bulging than heretofore.
  • the frequency of the points of contact of the supporting elements on the surface of the strand also permits the dissipation of a greater amount of heat.
  • the supporting elements are advantageously disk shaped supporting rollers which are arranged at spacings greater than the disk width and which extend at their outer peripheries closely to the next supporting shaft of the next row.
  • the supporting shafts are mounted in side blocks of a machine frame and the supporting elements are thus supported almost without friction so that the drawing resistance can be kept smaller precisely at that part of the strand skin which is particularly thin. It is possible therefore according to the invention, to provide for greater casting speed.
  • the above implementation form operates with less friction due to the fact that the supporting elements are mounted for rolling movement.
  • the supporting elements consist of plates disposed in rows, with the rows having gaps into which the plates of the adjacent support members extend. Each plate is connected to the support member by an arm.
  • the gaps between the plates and the support members are sufficiently great so that water vapor can be dissipated readily. Consequently, a particularly advantageous motor cooling consists in providing for heat transfer to the plate solely by contact with the strand and cooling the plates externally by spraying cooling water on them.
  • the cross members of shafts are made hollow and these hollow interior shaft passages supply the coolant to nonles which are arranged thereon to discharge the coolant against the surface of the strand'and they are oriented in the gap between two supporting elements.
  • This measure combines two advantageous measures simultaneously.
  • the cross shafts themselves are cooled and therefore dissipate amounts of heat absorbed by heat radiation and at the same time the space still available between two supporting elements is utilized to introduce cooling water.
  • Such a construction is superior to the state of the art because separate spray nozzle lines comprising a multiplicity of longitudinal and transverse lines are obviated, thus facilitating especially the readjustment of the supporting device to a new strand dimension.
  • the complicated structure of the coolant supply system has been a great hinderance to the specialist in case of strand breakages which are now eliminated.
  • An improved cooling effect can be achieved by orienting the center line of the nozzles obliquely to the strand surface and into the space between two supporting rollers. In practice this accomplishes an adaptation of the cooling system to the checker boardlike supporting system. No longer is there a gap between the various impact areas of the jet spray nozzles. Consequently the strand is cooled more intensely than heretofore. The cooling action considered over the width of the strand is also more uniform. An area of the strand once cooled will not get into a zone which is not charged by coolant for a longer period of time.
  • a further improvement of the invention comprises the use of additional cooling lines between the hollow interiors of the cross shafts and an outside diameter of the supporting roller shaft which serves as a journal. These branch offs from the interior of the cross shafts serve either for the cooling of the supporting roller journal or the cooling of the bearing point itself and bring about a certain lubricating effect.
  • the principal of internal cooling can also be further developed by arranging a group of cross shafts with supporting elements within a frame structure with one or more frame members which themselves provide means for conducting a coolant material.
  • Using the longitudinal means of the cross frame for the conducting of the liquid coolant also permits a connection of this cross frame member to the individual supporting shafts for conducting the coolant out to the nozzle members located along the length of the cross shafts.
  • spacers In accordance with further characteristics between the upper and the lower beam parts are arranged spacers, the length of which may be varied by means of shims in accordance with different strand thicknesses. This measure serves to set up the supporting device symmetrically with the spacing, always remaining uniform and limiting the efforts and time required for changing over.
  • the basic suggestion of the checker board-type arrangement for the supporting of the strand plus the cooling arrangement provides an improved supporting and cooling feature.
  • the supporting elements themselves in the form of rollers supported on the cross shafts may be such that they extend at their periphery into recesses defined on the cross shafts for this purpose.
  • an object of the invention to provide an improved device for supporting and cooling a strand from a continuous casting machine which includes a supporting frame having a plurality of longitudinally spaced rows of transversely extending cross members supported on the frameand a plurality of supporting members on the cross members arranged in transversely spaced orientation with the supporting members of adjacent rows being laterally offset and extending between adjacent supporting members of the next adjacent row and which further advantageously includes means for supplying a coolant at selected locations along the supporting members.
  • a further object of the invention is to provide a supporting structure for use in association with a continuous casting mold and which advantageously includes a cross member associated with the exit of the mold having at least one supporting member extending across the width thereof and carrying a plurality of spaced supporting members thereon, said cross member including means for directing a cooling spray from the supporting member at the locations between the supporting elements.
  • a further object of the invention is to provide a continuous strand supporting and cooling device which is simple in design, rugged in construction and economical to manufacture.
  • FIG. 1 is a top plan view of a supporting device for supporting cast strands of metal constructed in accordance with the invention
  • FIG. 2 is a section taken along the line lI-Il of FIG. 1;
  • FIG. 3 is a section taken along the line IIII II of FIG. 1;
  • FIG. 4 is an enlarged partial sectional view of a portion of FIG. 2;
  • FIG. 5 is a view of a portion of the device indicated in FIG. 1 showing the arrangement of the spray means for cooling.
  • the invention embodied therein comprises a supporting device generally designated 2 which is arranged adjacent the discharge of a continuous casting mold l which is filled continuously with a liquid metal.
  • the continuous casting mold carries projecting portions or brackets 3 and 4 at its underside 5 which together with intennediate projecting brackets 7 and 8 support a cross member or shaft 6.
  • the plurality of supporting elements in the form of plates or rollers 9 are rotatably mounted on the shaft 6 and they are arranged to engage and run with the movement of the continuous casting strand 28 which is delivered from the mold 1.
  • the supporting frame 2 is mounted at a spacing 11 away from the supporting elements 9 which are directly adjacent the discharge of the continuous mold 1.
  • the supporting device 2 is made up as a partial section 12 which may extend for example in a slabbing machine for one or two meters below the casting mold 1 after which may be arranged the known type of supporting devices because controlled cooling is no longer required.
  • Each partial section 12 includes right and left longitudinal beams 13 and 13' which are interconnected by upper and lower cross beams 15 and 14, respectively. Spacer beams 16 and 17 are arranged between the cross beams 14 and 15 to form the entire frame of the partial section 12.
  • the partial section 12 may of course be repeated several times in the travel direction of the strand 28.
  • the frames include side support blocks 22 and 23 which support cross support members generally designated 20 in the form of shafts 21 which are mounted in the blocks 22 and 23.
  • the shafts 21 are arranged in longitudinally spaced transverse rows and each shaft carries a plurality of supporting members 18 in the form of rotatable rollers 19 which are arranged in spaced transverse relationship.
  • the rollers 19 are mutually spaced by a distance 24 in such a manner that a roller of each row is arranged between two adjacent rollers of the next adjacent row in the space 24 and without its circumference 25 touching the surface 26 of the shaft 21. Gaps 27 are thus created through which steam can be continuously dissipated without trouble.
  • the rollers 19 are arranged as close to each other as possible and their peripheries 25 intersect.
  • the strand 28 involves a slab profile as indicated in FIG. 3 and therefore the dimensioning factors governing the supporting device are based on a steel slab strand.
  • the longitudinal beams 13 are hollow so that cooling water may flow through them in case no separate lines are provided for this purpose.
  • the shafts 21 are also made hollow and are advantageously provided with a center cavity or passage 29 for a coolant such as water. Coolant nozzles 30 are arranged along the length of the shafts and they connect to the passages 29. They are oriented so that the discharge 31 extends obliquely to the surface 32 of the strand as shown in FIG. 4. In the arrangement shown in FIG.
  • the shape of the spray jet 33 may result in an uninterrupted spray surface over the width of the cast strand 28. Accordingly with the inventive arrangement the cooling of the strand is more uniform and it has the particular advantage that no interruptions of spray areas will occur when other strand dimensions are involved. When modifying this spacing to accommodate a new strand dimension the spacing of the nozzles from the strand will remain the same because the diameter 25 of the rollers 19 will be the same and therefore the shafts 21 will also be the same, thus preserving the spacing of the spray orifices 33.
  • the nozzles are oriented at an angle to each other but of course a single nozzle having a center line oriented perpendicular to the strand may also be provided or be provided alternatively if desired.
  • a particularly intensive cooling action is obtained when perpendicular nozzles as well as oblique ones are provided and neither of these kind need necessarily be oriented in the plane of FIG. 4.
  • such nozzles oriented obliquely against the surface of the strand form an uninterrupted spray area over the width of the strand.
  • These nozzles are expediently designed in the form of flat jet nozzles but solid or hollow cone nozzles may also be employed.
  • the coolant nozzles 30 are advantageously mounted so that their sprays will meet at the location T/2 on the strand surface.
  • T signifies the spacing of the rollers 19 running one behind the other in one strand width sector.
  • coolant lines 33 extending from the central passage 29 and the outside of the profile 34 of the shaft 21. It is through these lines that the coolant reaches, as a lubricant, the race between the roller 19 and the shaft 21 which is not shown.
  • the invention is applicable quite generally to all strand thicknesses and is particularly advantageous for slab strands. Adjustment to various strand dimensions can be made due to the spacers 16 and 17 and the shims 35 of various thickness.
  • a supporting device for supporting casting strands of metal as they are fed from a casting mold comprising a supporting frame adapted to be positioned adjacent the casting mold, a plurality of longitudinally spaced rows of transversely extending cross members supported on said frame, a plurality of supporting members on said cross members arranged in transversely spaced orientation with the supporting members of adjacent rows being laterally offset and extending between the adjacent support members of each next adjacent row, said supporting elements being dimensioned as small as possible, and including cooling means for supplying a coolant through said cross members directly to the casting strand and for discharging the coolant between said supporting members along the length of said cross members.
  • a supporting device according to claim 1, wherein said support members comprise disk shaped supporting rollers.
  • a supporting device according to claim 1, wherein said supporting frame includes a bearing block at each side, said cross members being supported at each end in respective bearing blocks, said supporting members being rotatably supported on said cross members.
  • a supporting device according to claim 1, wherein said supporting elements comprise supporting plates disposed in rows, said plates being spaced apart to define gaps into which the plates of the next adjacent rows extend with clearance.
  • a supporting device for supporting casting strands of metal as they are fed from a casting mold comprising a supporting frame adapted to be positioned adjacent the casting mold, a plurality of longitudinally spaced rows of transversely extending cross members supported on said frame, a plurality of supporting members on said cross members arranged in transversely spaced orientation with the supporting members of adjacent rows being laterally offset and extending between the adjacent support members of each next adjacent row, said cross members comprising hollow shafts defining a passage for a coolant liquid, a plurality of cooling nozzles on said shaft communicating with said passage and arranged to discharge the liquid in a direction toward said strand and being located between said supporting members.
  • a supporting device according to claim 5, wherein said nozzles are oriented oblique to the strand surface and directed into the space between the two adjacent supporting members of the next adjacent rows.
  • a supporting device including two supporting frames comprising an upper supporting frame and a lower supporting frame each carrying said cross members and said supporting members, and spacer means between said frames for holding said frames at a width comparable to the width of the strand to be moved between said frames.
  • said spacer means includes shims for varying the spacing between said frames to accommodate variations of strand thickness.
  • a supporting device according to claim 1, wherein said cross members include recess portions between adjacent supporting members defining a space for receiving the supporting member of the next adjacent row.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US50465A 1969-10-18 1970-06-29 Device for supporting and cooling continuously cast strands of metal Expired - Lifetime US3651857A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691952633 DE1952633C3 (de) 1969-10-18 Stützvorrichtung für Gußstränge aus Metall, Insbesondere aus Stahl

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US3651857A true US3651857A (en) 1972-03-28

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JP (1) JPS4926419B1 (nl)
FR (1) FR2064415B3 (nl)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4228844A (en) * 1977-07-07 1980-10-21 Voest-Alpine Aktiengesellschaft Strand guiding stand for continuous casting apparatus
US4375820A (en) * 1976-10-04 1983-03-08 Hi-Hard Rolls, Inc. Roller for use in a conveyor-roller structure
US4462456A (en) * 1981-01-22 1984-07-31 Nippon Steel Corporation Transport roll for transporting hot material and train of such transport rolls
US4603729A (en) * 1983-06-17 1986-08-05 Kabushiki Kaisha Kobe Seiko Sho Piping assembly for use in roll section of continuous casting line
US20090020258A1 (en) * 2005-12-06 2009-01-22 Danieli & C. Officine Meccaniche S.P.A. Plant for producing metal strip

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50117790U (nl) * 1974-03-08 1975-09-26

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2804663A (en) * 1953-06-26 1957-09-03 Babcock & Wilcox Co Control system for continuous casting
US2895190A (en) * 1955-09-12 1959-07-21 Mannesmann Ag Continuous casting plants
US3268956A (en) * 1964-02-19 1966-08-30 Mesta Machine Co Continuous casting adjustable roller spray apron
US3536127A (en) * 1966-11-03 1970-10-27 Schloemann Ag Cooling system for continuous casting machine
GB1399695A (en) * 1972-05-11 1975-07-02 Asahi Glass Co Ltd Method of forming refractory oxide coating

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2804663A (en) * 1953-06-26 1957-09-03 Babcock & Wilcox Co Control system for continuous casting
US2895190A (en) * 1955-09-12 1959-07-21 Mannesmann Ag Continuous casting plants
US3268956A (en) * 1964-02-19 1966-08-30 Mesta Machine Co Continuous casting adjustable roller spray apron
US3536127A (en) * 1966-11-03 1970-10-27 Schloemann Ag Cooling system for continuous casting machine
GB1399695A (en) * 1972-05-11 1975-07-02 Asahi Glass Co Ltd Method of forming refractory oxide coating

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4375820A (en) * 1976-10-04 1983-03-08 Hi-Hard Rolls, Inc. Roller for use in a conveyor-roller structure
US4228844A (en) * 1977-07-07 1980-10-21 Voest-Alpine Aktiengesellschaft Strand guiding stand for continuous casting apparatus
US4462456A (en) * 1981-01-22 1984-07-31 Nippon Steel Corporation Transport roll for transporting hot material and train of such transport rolls
US4603729A (en) * 1983-06-17 1986-08-05 Kabushiki Kaisha Kobe Seiko Sho Piping assembly for use in roll section of continuous casting line
US20090020258A1 (en) * 2005-12-06 2009-01-22 Danieli & C. Officine Meccaniche S.P.A. Plant for producing metal strip
US8033318B2 (en) * 2005-12-06 2011-10-11 Danieli & C. Officine Meccaniche S.P.A. Plant for producing metal strip

Also Published As

Publication number Publication date
FR2064415B3 (nl) 1973-01-12
DE1952633B2 (de) 1976-03-18
DE1952633A1 (de) 1971-04-29
FR2064415A7 (nl) 1971-07-23
JPS4926419B1 (nl) 1974-07-09

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