EP2032287A2 - Dispositif et procédé permettant de produire une bande métallique par coulée continue - Google Patents

Dispositif et procédé permettant de produire une bande métallique par coulée continue

Info

Publication number
EP2032287A2
EP2032287A2 EP07725479A EP07725479A EP2032287A2 EP 2032287 A2 EP2032287 A2 EP 2032287A2 EP 07725479 A EP07725479 A EP 07725479A EP 07725479 A EP07725479 A EP 07725479A EP 2032287 A2 EP2032287 A2 EP 2032287A2
Authority
EP
European Patent Office
Prior art keywords
slab
cooling
cutter
milling
cooling medium
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Withdrawn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
EP07725479A
Other languages
German (de)
English (en)
Inventor
Jürgen Seidel
Peter Sudau
Jürgen Merz
Matthias Kipping
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.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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 SMS Demag AG filed Critical SMS Demag AG
Publication of EP2032287A2 publication Critical patent/EP2032287A2/fr
Withdrawn legal-status Critical Current

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/13—Surface milling of plates, sheets or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/28—Features relating to lubricating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/28—Features relating to lubricating or cooling
    • B23C5/281—Coolant moving along the outside tool periphery towards the cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/10—Arrangements for cooling or lubricating tools or work
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/44—Cutting by use of rotating axially moving tool with means to apply transient, fluent medium to work or product
    • Y10T408/46—Cutting by use of rotating axially moving tool with means to apply transient, fluent medium to work or product including nozzle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/303976—Milling with means to control temperature or lubricate
    • Y10T409/304032—Cutter or work

Definitions

  • the invention relates to an apparatus for producing a metal strip by continuous casting, with a casting machine, in which a slab is cast, wherein in the conveying direction of the slab behind the casting machine at least one milling machine is arranged in the at least one surface of the slab, preferably two opposing surfaces , can be milled off. Furthermore, the invention relates to a method for producing a metal strip.
  • Continuous casting of slabs in a continuous casting plant can result in surface defects such as oscillation marks, casting powder defects or longitudinal and transverse surface cracks. These occur in conventional and thin slab casters. Depending on the intended use of the finished strip, therefore, the conventional slabs are partially flamed. Some slabs are generally flamed on customer request. The demands on the surface quality of thin slab plants are continuously increasing.
  • flaming for surface treatment, flaming, grinding or milling are suitable.
  • the flame has the disadvantage that the melted material can not be melted down again without treatment due to the high oxygen content.
  • metal splinters mix with the grinding wheel dust, so that the abrasion must be disposed of. Both methods are difficult to adapt to the given transport speed. It therefore offers a surface treatment by milling.
  • the hot milling chips are collected and can be packaged and smelted without processing without problems and thus add back to the production process.
  • the cutter speed can be easily set to the transport speed (casting speed, finishing line feed speed).
  • the device according to the invention of the type mentioned above therefore depends on the milling.
  • a device of the type mentioned above with a milling machine, which is arranged behind a continuous casting plant is known. Reference is made to CH 584085 and to DE 199 50 886 A1.
  • a further embodiment of a surface milling machine is shown in DE 197 17 200 A1.
  • the surface treatment and the associated facilities are not limited to thin slabs, but can also be used inline behind a conventional thick slab caster and in slabs cast with a thickness of greater than 120 mm up to 300 mm.
  • the inline milling machine is generally not used for all products of a rolling program, but only for those where higher surface requirements are required. This is advantageous for application reasons and reduces the Fräsmaschinenabpart and is therefore useful.
  • the present invention is therefore based on the object to improve an apparatus for producing a metal strip by continuous casting using a milling machine so that the disadvantages mentioned are reduced. So it should be created a device with which the or the milling tools are protected even with prolonged use time and processing of the hot slab so that longer life can be achieved.
  • the means for cooling the milling cutter can be designed as nozzles with which a cooling medium, preferably over the entire width, can be applied to the area of the cutting surfaces of the milling cutter.
  • the nozzles can be arranged so that they apply the cooling medium to the cutter at a location remote from the slab on this. This can prevent excessive cooling of the slab.
  • the cooling medium can be collected again in a collecting device.
  • the milling cutter may alternatively or additionally have in its interior at least one supply bore for cooling medium, which leads to the region of the cutting surfaces.
  • it can have a concentric supply bore, from which at least one further supply bore leads to the region of the cutting surfaces.
  • a collecting device for cooling medium is arranged adjacent to the cutter.
  • This can have a collecting trough for cooling medium.
  • the collecting device may also have a half-side covering the cutter cover.
  • the cover can - viewed in the direction of the Fräser loftachse - be semicircular.
  • a collecting trough is located in the front and / or rear end region of the cover.
  • a further alternative of the inventive concept provides that the means for cooling the milling cutter are designed as fans or blowers.
  • the means for cooling the milling cutter are formed as bores through which a cooling medium is passed through the interior of the milling cutter.
  • the cooling medium is integrated in the cycle of the cooling system of the entire system.
  • the cooling medium may be water, an oil-water emulsion, air, spray or steam.
  • means for dimming the temperature distribution over the slab thickness and / or for cleaning the slab surface can be arranged. These may be nozzles for delivering a fluid to the slab.
  • a cutter will be arranged for the processing of the top and the bottom of the slab.
  • Each cutter can interact with a support roller arranged on the other side of the slab.
  • a rolling train is arranged in the conveying direction behind the milling machine.
  • both means for cooling the milling cutter from the outside and means for cooling the milling cutter are provided from the inside.
  • the means for cooling the milling cutter for subcooling the slab surface are designed shortly before the milling process.
  • the means for cooling the milling cutter can be designed so that different amounts of coolant can be applied to the top and bottom of the slab.
  • a cutter can be arranged in each case.
  • a scale washer can be arranged between the milling machine and in front of a rolling stand.
  • a preferred solution provides that the Zunw scrubber is single-row.
  • the method for producing a metal strip by continuous casting by means of a device of the type described is characterized in that before and / or behind the milling machine, the slab temperature is measured on the top and / or bottom of the slab, with a operated in a machine control process model in Depending on the determined temperatures, the amount of coolant is determined with which the slab is cooled.
  • the cooling of the slab on the top and bottom of the same can take place according to further education.
  • An alternative embodiment of this method provides that the slab is cooled and the amount of coolant for cooling the slab is determined by a process model operated in a machine control, wherein the process model determines the amount of coolant as a function of the chipping volume milled by the slab.
  • the determination of the amount of coolant can continue taking into account the slab transport speed and / or taking into account the temperature of the surface of the slab and / or taking into account the nature of the material of the slab.
  • the proposed solution makes it possible to significantly reduce the thermal load on the milling tool. It is therefore possible, much higher
  • FIG. 1 shows schematically the side view of an apparatus for producing a metal strip by continuous casting, in which a milling machine is used,
  • FIG. 2 shows an enlarged detail of FIG. 1 showing the milling machine
  • FIG. 3 shows the arrangement according to FIG. 2 with a device for guiding the cooling medium in the closed system
  • FIG. 4 shows the side view of a milling cutter together with a support roller according to an alternative embodiment of the invention
  • FIG. 5 shows the side view of a milling cutter together with a support roller and chip transport device according to a further alternative embodiment of the invention
  • 6b is a front view of a sectional view of a cooled milling cutter according to another embodiment of the invention.
  • FIG. 7 is a side view of a cutter for the slab top together with support roller with a collecting device for cooling medium
  • 8a is a side view of a milling cutter with a collecting device for cooling medium according to an alternative to Fig. 7 embodiment of the invention
  • FIG. 8b shows a variant of FIG. 8a
  • Fig. 9 shows the front view of a milling cutter with air cooling and water cooling of the bearings
  • Fig. 10b is a front view of a sectional view of a cooled milling cutter according to another embodiment of the invention.
  • Fig. 1 an apparatus for producing a metal strip 1 is shown by continuous casting.
  • the metal strip 1 or the corresponding slab 3 is continuously cast in a casting machine 2 in a known manner.
  • the slab 3 is preferably a thin slab.
  • the slab 3 is subjected to a slab cleaning in a cleaning system 19. This is followed by a surface inspection by means of a surface measuring device 20.
  • the slab 3 enters an oven 21, so that it can be kept at a desired process temperature.
  • the oven is followed by a ferry 22.
  • the slab 3 enters a milling machine 4.
  • two milling cutters 6 are arranged in the conveying direction F, with which the lower or the upper surface of the slab 3 are milled off can.
  • the respective opposite surface of the slab 3, ie the top or the bottom thereof, is supported by support rollers 18.
  • Behind the milling machine 4 is a descaling device 39, in this case in each case a single-row scale scrubber above and below the slab, and a rolling train, of the rolling stands 23 and 24 are shown.
  • a collecting container 25 in which milled material is collected.
  • means 5 for cooling the milling cutters 6 are provided in the milling machine 4.
  • these means 5 are designed as spray nozzles 7, which can be applied to those a suitable cooling medium (liquid or gaseous) over the width of the slab 3. This can be done directly or indirectly, a cooling of the cutter 6 and especially their cutting surfaces 8, which are indicated in Fig. 2 only very schematically.
  • spray nozzles 7 can be arranged so that the cutting surfaces 8 of the milling cutters 6 are sprayed directly. But it can also - as can be seen further - be provided that the discharge of cooling medium takes place on the slab 3, so far as an indirect cooling of the cutter 6 takes place. In Fig. 2, both possibilities are shown. In the latter case, therefore, the strip surface is cooled immediately before the cutter 6.
  • the support roller 18 is located slightly below or above the pass line to create a contact pressure on the support roller.
  • means 17 for cleaning the slab surface are arranged directly in front of the milling machine 4. This also slab cooling can be achieved, which protects the cutter 6 and otherwise the slab 3 pre-cleaned the cutters 6 supplies, which protects them.
  • the surface temperature can be trimmed from the top to the bottom of the slab. The trimming of the amount of water that is discharged through the nozzles 17 is carried out, depending on the measured temperature distribution before and / or behind the milling machine. 4
  • means 16 can be provided, with which a guiding of the cooling medium can take place in the closed system.
  • These means 16 have a collecting container 27 for the preparation of the cooling medium, wherein preferably an emulsion or dispersion can be used. If necessary, the supply of fresh components of the cooling medium (oil or water, depending on the mixing ratio) take place, in which the cooling medium should be present.
  • FIG. 4 shows that the injection molding of the cutting surfaces 8 of the milling cutter 6 can also take place counter to the conveying direction F behind the milling cutter 6.
  • cooling of the milling cutter 6 is additionally provided, which will be described in more detail later in connection with FIG. 6.
  • the cutting edge cooling can be designed here in the form of a simple bore.
  • a spray nozzle may be provided at the exit point, which fans out the jet of the cooling medium (water jet) and directs it onto the cutting surface 8 of the milling cutter 6.
  • a cutting-water cooling and cutting lubrication can be provided.
  • a combination of milling cutter lubrication (milling cutter lubrication) from the inside and milling cutter cooling from the outside is also conceivable.
  • the means 5 for cooling the milling cutter 6 are designed as follows:
  • the milling cutter 6 is mounted on both sides by means of a respective bearing 33, in an axial end region of the milling cutter 6 a rotary coupling 34 is arranged with the cooling medium , for example in the form of water, is fed to the milling cutter 6 via a line 35 in the direction of the arrow.
  • the milling cutter 6 is provided with a centric supply bore 9, from which further supply bores 10 extend at an angle to the radial direction and terminate in the area of the cutting surfaces 8 in such a way that cooling medium supplied via the conduit 35 reaches the cutting surfaces 8. It is therefore provided here an integrated coolant hole for cutting cooling, wherein cooling medium can be used both under high and at low pressure. For a reduction of the temperature stresses in the cutting surfaces 8 is possible.
  • the cooling medium not only desirably cools the mill 6, but also the slab 3, which is sometimes undesirable.
  • the embodiment of the invention according to FIG. 7 provides a collecting device 11, which catches the cooling medium after it has cooled the milling cutter 6, so that it does not cool the slab 3 in an excessive manner.
  • the collecting device is designed in the embodiment of FIG. 7 so that an arcuate cover 13 is used, which covers the cutter 6 approximately over a circumference of 180 °. So that the cooling medium after cooling of the cutter 6 as possible does not reach the slab, in the conveying direction in front of and behind the milling cutter 6 collecting troughs 12 from the sheet metal Cover 13 formed, which form a collecting volume for the cooling medium.
  • This collecting troughs 12 may be formed as a channel with a slope for the flow of the cooling medium.
  • the collecting troughs 12 can form a baffle plate 36 for chips in their region facing the slab 3. Otherwise undesirable in the collecting trough 12 reached chips can be flushed from there.
  • FIGS. 8a and 8b A simpler, but in some cases sufficient solution is shown in FIGS. 8a and 8b.
  • a simplified catching device 11 is provided, which consists of a sheet which is bent so that a collecting trough 12 is formed.
  • the cooling means 5 are again embodied as nozzles 7, which guide a jet of cooling medium over the entire width of the milling cutter 6.
  • the collecting device 12 may be arranged in the conveying direction F before (FIG. 8 a) or behind the milling cutter 6 (FIG. 8 b).
  • the direction of rotation of the milling cutter 6 is again indicated by an arrow.
  • the cooling medium, which is collected by the collecting device 11, can run off laterally next to the slab 3 into a sintering channel (see vertical arrow).
  • a fan 14 is arranged above the cutter 6, with which the cutter 6 is blown from above and thus cooled. Laterally - as in the other embodiments - nozzles 37 are arranged to cool the bearings 33.
  • FIGS. 10a and 10b A further alternative embodiment of the cooling of the milling cutter 6 is shown in FIGS. 10a and 10b.
  • a number of holes 15 in the axial direction, by the cooling medium is promoted to cool the cutter 6 in this way.
  • a rotary coupling 34 is also provided here, via which cooling medium is conveyed from a line 35 into the bores 15.
  • the cooling medium only exits at the other axial end of the milling cutter 6 and drains into a sintering trough, so that the slab 3 is not cooled by the cooling medium.
  • the holes 15 are - as seen in the embodiment - designed as blind holes; the outflow of the cooling medium takes place via drain holes 38 which attach at an angle to the bores 15.
  • the milling cutter 6 With a long service life, the milling cutter 6 is subject to a high thermal load during the hot rolling process. It is advantageous for a cooling, so that the milling cutter, the bearings etc. are not too warm.
  • a strip surface cooling is provided shortly before the milling engagement, whereby the temperature flow into the milling cutter edge is reduced.
  • the mill cutter is shielded from the warm surface.
  • the target surface temperature for the short milling process which corresponds to the transformation temperature, is aimed at. It is expected that the material softens briefly and sets a lower forming and thus cutting load.
  • the cutting surfaces 8 of the milling tool 6 are sprayed during circulation with lubricant (oil mist, oil-water mixture, etc.) to reduce the cutting force and thereby increase the service life of the milling tool.
  • lubricant oil mist, oil-water mixture, etc.
  • the lubricant is not applied to the hot strip (as is the case when milling in the cold state). lent), but injected to the cutting edge, where the oil sticks and later acts during the cutting process.
  • the water volumes of the cooling or cleaning bars can be adjusted separately at the top and bottom, in order to combat or avoid a transverse curvature of the slab.
  • chip removal or chip removal or chip removal areas In front of and behind the respective milling cutter 6 chip removal or chip removal or chip removal areas (collecting funnels, baffles, suction pipes, transverse spraying, scrapers on the belt, etc.) can be provided in order to be able to practice either synchronous and countercurrent milling of the milling cutter 6.
  • the cooling water supply is preferably carried out laterally via a rotary coupling; the outlet is made open on the opposite side, so that the water can drain freely laterally into a sintering channel.
  • the cooling water falls on the slab, especially on the upper side of the slab.
  • the water can be collected in a gutter.
  • cooling water is injected tangentially to the cutter blades and collected in the gutter behind it, so that it can drain laterally next to the belt in the sintering channel.
  • This cooling can also be combined with the cooling of the roller mill bearing with water.
  • the amount of cooling medium for the cutter 6 is controlled in dependence on the milling removal or the machined volume.
  • a cutting lubrication with emulsion with the aid of the supply bores 10 is simultaneously brought to the cutting surface 8 of the milling cutter 6 and the milling cutter 6 is cooled by external cooling by means of the nozzles 7.

Abstract

La présente invention concerne un dispositif permettant de produire une bande métallique (1) par coulée continue, au moyen d'une machine de coulée (2) dans laquelle une brame (3) est coulée. Au moins une fraiseuse (4) se trouve dans la direction de transport (F) de la brame (3) au-delà de la machine de coulée (2). Au moins une surface de la brame (3), de préférence deux surfaces opposées, peuvent être fraisées dans ladite fraiseuse. Afin d'optimiser la durée d'utilisation de la fraise/des fraises de la fraiseuse, des moyens (5) sont prévus sur ou dans la fraiseuse (4) pour refroidir la/les fraise(s) (6). Cette invention concerne également un procédé permettant de produire une bande métallique.
EP07725479A 2006-05-26 2007-05-23 Dispositif et procédé permettant de produire une bande métallique par coulée continue Withdrawn EP2032287A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102006024586 2006-05-26
DE102007022929A DE102007022929A1 (de) 2006-05-26 2007-05-14 Vorrichtung und Verfahren zum Herstellen eines Metallbandes durch Stranggießen
PCT/EP2007/004579 WO2007137748A2 (fr) 2006-05-26 2007-05-23 Dispositif et procédé permettant de produire une bande métallique par coulée continue

Publications (1)

Publication Number Publication Date
EP2032287A2 true EP2032287A2 (fr) 2009-03-11

Family

ID=38511746

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07725479A Withdrawn EP2032287A2 (fr) 2006-05-26 2007-05-23 Dispositif et procédé permettant de produire une bande métallique par coulée continue

Country Status (14)

Country Link
US (1) US20090314457A1 (fr)
EP (1) EP2032287A2 (fr)
JP (1) JP2009536581A (fr)
KR (1) KR101060124B1 (fr)
AR (1) AR061190A1 (fr)
AU (1) AU2007267402B2 (fr)
BR (1) BRPI0710837A2 (fr)
CA (1) CA2650721A1 (fr)
DE (1) DE102007022929A1 (fr)
EG (1) EG25141A (fr)
MX (1) MX2008013438A (fr)
RU (1) RU2393051C1 (fr)
TW (1) TW200810860A (fr)
WO (1) WO2007137748A2 (fr)

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Also Published As

Publication number Publication date
MX2008013438A (es) 2008-10-29
AU2007267402A1 (en) 2007-12-06
CA2650721A1 (fr) 2007-12-06
BRPI0710837A2 (pt) 2011-08-23
DE102007022929A1 (de) 2007-12-20
AR061190A1 (es) 2008-08-13
KR20090033173A (ko) 2009-04-01
JP2009536581A (ja) 2009-10-15
TW200810860A (en) 2008-03-01
RU2008144714A (ru) 2010-05-20
US20090314457A1 (en) 2009-12-24
KR101060124B1 (ko) 2011-08-29
WO2007137748A2 (fr) 2007-12-06
AU2007267402B2 (en) 2010-05-06
EG25141A (en) 2011-09-25
RU2393051C1 (ru) 2010-06-27
WO2007137748A3 (fr) 2008-04-17

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