EP0451129A2 - Verfahren und Vorrichtung zur Abstützung eines stranggegossenen Metallproduktes - Google Patents

Verfahren und Vorrichtung zur Abstützung eines stranggegossenen Metallproduktes Download PDF

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Publication number
EP0451129A2
EP0451129A2 EP19910870054 EP91870054A EP0451129A2 EP 0451129 A2 EP0451129 A2 EP 0451129A2 EP 19910870054 EP19910870054 EP 19910870054 EP 91870054 A EP91870054 A EP 91870054A EP 0451129 A2 EP0451129 A2 EP 0451129A2
Authority
EP
European Patent Office
Prior art keywords
metal product
support roller
product
annular volume
support
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19910870054
Other languages
English (en)
French (fr)
Inventor
Stéphan Wilmotte
Marios Economopoulos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Centre de Recherches Metallurgiques CRM ASBL
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Publication of EP0451129A2 publication Critical patent/EP0451129A2/de
Withdrawn legal-status Critical Current

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Classifications

    • 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

  • the present invention relates to a method and a device for supporting a continuously cast metal product.
  • the invention relates more particularly to a wide product, such as a slab, and more specifically still a steel slab, without however being limited to this single application.
  • the slab is usually supported by rollers of relatively small diameter, which are themselves supported at their ends, that is to say on either side of the width of the slab.
  • rollers of relatively small diameter, which are themselves supported at their ends, that is to say on either side of the width of the slab.
  • these rollers deform under the effect of the load applied by the slab, and that they then take an undesirable curvature.
  • the object of the present invention is to provide a method and a device for supporting a continuously cast metal product, whatever the width of this product, using simple means which prevent any deformation of the support rollers.
  • the method and the device of the invention are applicable both in conventional continuous casting as in continuous casting of thin products, with or without rolling.
  • a method for supporting a continuously cast metal product in which said metal product is supported by means of a plurality of support rollers extending along the width of said metal product and succeeding each other along the trajectory followed by this product, is characterized in that individually formed on the surface of at least one of said support rollers a layer of coolant under pressure extending in longitudinal direction substantially over the entire length of said support roll and in circumferential direction on an arc corresponding to an angle at the center of at least 90 °, said layer of pressurized coolant being substantially diametrically opposite at the region of contact of said support roller with the metallic product, and in that it ensures the flow of at least part of said coolant under pressure on the lateral surface of said support roller, beyond said layer.
  • this method ensures the flow of at least a portion of said pressurized coolant over the surface of said metal product.
  • the pressure prevailing in the coolant layer can be different with each support roll.
  • the present invention also relates to a device for supporting a continuously cast metal product, in application of the method which has just been described.
  • a device for supporting a continuously cast metal product which comprises a plurality of support rollers extending along the width of said metal product and succeeding each other along the path followed by this product, is characterized in that 'It comprises at least one wall respectively adjacent to one of said support rollers, in that said wall remotely follows the shape of said support roller so as to define therewith a portion of annular volume, in that said portion of annular volume extends in longitudinal direction substantially over the entire length of said support roller and in circumferential direction on an arc corresponding to an angle at the center of at least 90 °, said portion of annular volume being substantially diametrically opposite to the contact region of said support roller with the metallic product, and in that said annular volume portion is provided with hub ns inlet and outlet for a coolant.
  • said wall constitutes the concave face of the cavity of a hydraulic bearing, which is coaxial with said support roller.
  • throttling means preferably adjustable, to vary the outlet section of said portion of annular volume. along said longitudinal edges.
  • guide means extending said wall in the circumferential direction beyond said throttling means, said guide means also conforming to the shape of said support roller and extending to a small distance from the continuously cast metal product.
  • the aforementioned guide means are provided, at their end close to the metal product, fins substantially parallel to said metal product and oriented outwards relative to the support roller to which said means are associated.
  • This figure is only a schematic representation, without particular scale, comprising only the elements necessary for understanding the invention. Furthermore, it shows only one support roll, but it goes without saying that any number of support rolls of a continuous casting installation can be supported in accordance with the teachings of the present invention.
  • This figure shows a section through a device according to the invention, section which is made along a plane perpendicular to the longitudinal axis of said support roll.
  • a bearing 4 is arranged which bears on a fixed seat, for example on the frame of the casting machine. It should be emphasized that the position of this bearing 4 is in principle fixed during a continuous casting operation; this position can however be modified for different casting operations, in particular as a function of the thickness of the slab or the reduction rate of this thickness. It will also be indicated that the bearing 4 extends over the entire length of the support roller 3, that is to say at least over the width of the slab 1. With such a bearing, it is obviously unnecessary to provide rollers for supporting the support roller 3.
  • the bearing 4 has a semi-cylindrical cavity 5, facing the slab 1, in which is housed the support roller 3.
  • the cavity 5 is preferably coaxial with the support roller 3, and the latter is arranged so as to define with the cavity 5 a portion of annular volume 6 whose radial height is preferably constant.
  • the annular volume portion 6 communicates through a plurality of passages 7 with a source of pressurized coolant, not shown.
  • These passages 7 can be arranged in any suitable manner; they are preferably distributed uniformly along the length of the bearing 4.
  • heels 8 are mounted, which can be fixed at different distances from the support roller 3.
  • the double arrows express the possibilities of displacement of the heels 8.
  • These heels 8 constitute organs constrictions which make it possible to vary, together or separately, the longitudinal end sections of the annular volume portion 6.
  • the heels 8 can be provided with cheeks 9 which follow the shape of the support roller 3 from a distance and which define therewith extensions 10 of the annular volume portion 6.
  • the cheeks 9 may have fins 11 arranged parallel to the surface of the slab 1. These fins 11 define with the slab 1 channel sections 12, 13, of width respectively. e1 and e2, which extend transversely over the entire width of the slab 1, below and above the area of contact of the slab 1 with the support roller 3.
  • this device operates in the following manner.
  • a slab 1 leaving a continuous casting mold, not shown, has a solidified skin of small thickness, indicated by a dotted area, which surrounds a still liquid core, corresponding to the hatched part.
  • This slab descends vertically, in the direction of arrow 2, and it enters the secondary cooling zone symbolized by the support roller assembly illustrated in the figure.
  • the slab 1 comes into contact with a pair of support rollers 3, only one of which is shown, which support it and, optionally, reduce its thickness, depending on the force they exert on the slab.
  • This effort is itself the result of a pressure applied to the support roller 3 by a pressurized coolant, introduced into the annular volume portion 6 through the passages 7.
  • This pressurized coolant is supplied by a pump or by any other suitable device, not shown.
  • the heels 8 are adjusted in a position where they provide the desired value of the outlet section of the annular volume portion 6. As is easily understood, a reduction in this outlet section results in an increase in the pressure drop due to the heels 8 and consequently causes an increase in the pressure applied by the coolant to the support roller 3. This obviously results in an increase in the force exerted by the support roller 3 on the slab.
  • the adjustment of the position of the heels 8 therefore makes it possible to modify the tightening of the support rollers 3 on the slab 1.
  • the device of the invention makes it possible either to simply support the slab, or to carry out a rolling of this slab by a modification of the force exerted by the support rollers 3.
  • the figure illustrates the case of a rolling which operates a thickness reduction equal to 2 x (e1 - e2), e1 and e2 being the distances between the surface of the slab and the plane of the fins 11, respectively after and before the support roller 3.
  • the pressurized coolant generally water
  • the bearing 4 is therefore no longer exposed to overheating and it is no longer subject to seizure.
  • the support roller 3 is uniformly supported over its entire length and it does not deform, even under the high forces required for rolling the slab.
  • the slab itself retains the desired section since its large faces are properly supported.
  • the flow rate of the pressurized coolant can be modified, depending on the application, by changing the feed rate and / or the position of the heels 8.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP19910870054 1990-04-06 1991-04-02 Verfahren und Vorrichtung zur Abstützung eines stranggegossenen Metallproduktes Withdrawn EP0451129A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9000386A BE1004076A7 (fr) 1990-04-06 1990-04-06 Procede et dispositif pour supporter un produit metallique coule en continu.
BE9000386 1990-04-06

Publications (1)

Publication Number Publication Date
EP0451129A2 true EP0451129A2 (de) 1991-10-09

Family

ID=3884749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910870054 Withdrawn EP0451129A2 (de) 1990-04-06 1991-04-02 Verfahren und Vorrichtung zur Abstützung eines stranggegossenen Metallproduktes

Country Status (2)

Country Link
EP (1) EP0451129A2 (de)
BE (1) BE1004076A7 (de)

Also Published As

Publication number Publication date
BE1004076A7 (fr) 1992-09-22

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