Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
  • B21B13/22—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for rolling metal immediately subsequent to continuous casting, i.e. in-line rolling of steel
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
  • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
  • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
  • B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
  • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
  • B21B31/10—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts by horizontally displacing, i.e. horizontal roll changing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
  • B21B37/005—Control of time interval or spacing between workpieces
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/004—Heating the product
• • 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
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
  • Y10T29/49988—Metal casting
  • Y10T29/49989—Followed by cutting or removing material
• • 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
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
  • Y10T29/49988—Metal casting
  • Y10T29/49991—Combined with rolling

Definitions

• the invention relates to a method and a casting and rolling plant for semi-continuous rolling or continuous rolling by casting a metal, in particular a steel strand, which is cross-divided after solidification, if necessary, the casting strand partial lengths are guided into a roller hearth furnace for heating and uniformity to the rolling temperature , and the partial lengths with rolling temperature are introduced for rolling into a rolling mill, the continuous casting being continued without interruption during the rolling operation.
• Such a method is known from EP 0 264 459 B1.
• the partial lengths of the casting strand are stored in the tunnel furnace with transverse transport.
• the partial casting lengths are stored over a period of time which is a multiple, e.g. four times their casting time.
• the method is carried out in such a way that the rolling of each individual casting strand part length is carried out in a time unit which is only a fraction, e.g. corresponds to a fifth of its casting time, and to the effect that the rolling is carried out discontinuously and the rolling process is interrupted with a pause for a period of time which corresponds to the difference between a casting time and a rolling.
• This process is strictly based on continuous casting and is not matched to the rolling process.
• the invention has for its object to tune the semi-continuous rolling and the continuous rolling more closely to the conditions during rolling in order to adapt the rolling process to the continuous casting process.
• the object is achieved according to the invention in that the casting speed is reduced for a roll change in such a way that a sufficient buffer time for a roll change is maintained between the end of the rolling of the previous multiple length and the piercing of a new partial length or multiple length in the rolling mill.
• the semi-endless rolling and the endless rolling are adapted to the conditions of the rolling and a buffer time is created for the inevitable roll change.
• the larger lengths of rolling stock resulting from semi or endless rolling are taken into account in that several coils are produced from a multiple length.
• the buffer time for the roll change can also be influenced by reducing the casting speed depending on the feed speed of the rolling mill and / or the roll change time including the calibration time and / or the buffer length of the roller hearth furnace and / or the final roll thickness after the cross-cutting.
• the buffer length of the roller hearth furnace be matched to at least one roller level.
• the casting speed V c which corresponds to the feed speed V w of the rolling mill, is reduced to the same or greater according to the following formula:
• a further time saving can be achieved by increasing the final rolling thickness and / or the feed speed of the rolling mill between rolling campaigns within a casting sequence after the cross-cutting.
• Another embodiment is that a combination of an adjustment of the casting speed and the final rolling thickness is used to optimize the production output.
• Another buffer time can be achieved by increasing the final rolling thickness by a factor of 2 and reducing the casting speed to a minimum of 30%.
• the method can be used in such a way that, after the cross-cutting, the casting speed is reduced and / or the drawing-in speed of the rolling mill and / or the final rolling thickness are increased, the worn rolls of the rolling mill are changed after the rolling has ended and after this has taken place Roll change the casting speed is increased to the feed speed of the rolling mill.
• the casting and rolling system required for carrying out the process for semi-continuous rolling or continuous rolling of a cast metal or steel strand which can be divided into partial lengths when required in the solidified state and the partial lengths of the continuous strand can be kept warm in a roller hearth furnace and heated to the rolling temperature and comparable and are insertable into a rolling mill, the sequential arrangement of the continuous casting machine, a transverse partial facility, a roller hearth furnace, additional facilities, a rolling mill and at the end of a coiler.
• the casting and rolling system can then be operated according to the method described above, in that between the continuous casting machine and the rolling train a roller hearth furnace with at least one roll level, at the entrance and / or exit of which a cross-section device, subsequently a descaling device, is provided, followed by the rolling train and a separating device, a cooling section and coiler systems are arranged behind the rolling mill.
• One embodiment consists in the fact that, with at least two roller levels, pivotable roller tracks are arranged at the entrance and exit of the roller hearth furnace, each with a bending and / or straightening unit. The strand material can thus be guided precisely into the respective roll level.
• the strand guide can also be designed in such a way that multiple lengths can be introduced at a single height level from the outlet of the continuous casting machine through the roller conveyor of the roller hearth furnace into the rolling mill.
• FIG. 2A shows a partial side view with a casting strand, the casting speed being equal to or less than the rolling speed
• FIG. 2B shows the same view with the transport speed of a casting strand partial length increased to the rolling speed
• 3A shows the continuous casting and rolling at the same casting and rolling speed and with two coiler systems
• FIG. 3B shows the continuous casting and rolling with the two coiler systems
• FIG. 4A shows the situation when the roll is changed and the casting speed is reduced
• FIG. 4B shows the situation after the roll has been changed and increased
• a casting and rolling plant is shown in side view, consisting of a continuous casting machine 1, in which a casting strand 1 a is generated, a roller hearth furnace 2 and a rolling mill 3 with the associated ancillary devices.
• a tundish 4 is fed from a ladle (not shown), to which a continuous casting mold 5, a support roller stand 6 with a bending unit 7 and a straightening machine 8 are arranged.
• a transverse dividing device 10 and behind it (as an alternative in FIG. 5) a pivotable roller conveyor 11 for the entrance 12a of the roller hearth furnace 2.
• a pivotable roller conveyor 13 and a cross-section device 14.
• the basic embodiment in FIG. 1 works without the pivotable roller conveyors 11, 13.
• the rolling mill 3 begins after the cross-cutting device 14 with a descaling device 15. This is followed by the rolling mill 3 with about five to seven roll stands. Downstream of the roll stands, a cooling section 17 and, following this, two coiler systems 18 are provided after a separating device 16.
• the method is used for semi-continuous rolling or continuous rolling by casting liquid metal, in particular liquid steel, into one
• Casting strand 1 a which after solidification in the cross-section device 10 in casting strand partial lengths 20 is conveyed into the roller hearth furnace 2.
• the respective casting strand part length 20 is heated in the roller hearth furnace 2, the temperature is evened out and brought to the rolling temperature for rolling out in the rolling train 3. During this time, the continuous casting continues without interruption.
• the casting speed V c is reduced for a roller change such that a sufficient one between the end of the rolling of a previous multiple length 21 and the piercing of a new partial length 20 or multiple length 21 in the rolling train 3 Buffer time for the roll change is available.
• Multiple coils 22 can be wound from the multiple length 21.
• the casting speed V c is reduced, for example, as a function of the feed speed V w of the rolling train 3 and / or the respective roll change time, including a calibration time and / or the buffer length 23 of the roller hearth furnace 2 and / or the final roll thickness after the cross-cutting.
• the buffer length 23 of the roller hearth furnace 2 can be matched to at least one roller level 24 (cf. FIG. 1).
• the casting speed V c is set equal to or less than the drawing speed V w into the rolling mill 3. As soon as the roller hearth furnace 2 is loaded, the speed V c can be raised again to the feed speed V w , as shown in FIG. 2B.
• Fig. 3A endless rolling is shown.
• the casting strand 1 a is guided and rolled at the casting speed V c , which is equal to the drawing speed V w into the first roll stand, then cooled, wound and cut in the separating device 16.
• the casting strand 1a as shown in FIG. 3B, can be used with a reduced casting Velocity V c are poured and the part of the cast strand 20 separated is rolled and wound at feed speed V w .
• the casting speed V c is reduced equal to or greater according to the following formula: 1
• V w feed speed of the rolling mill (m / min)
• ⁇ t roll change time (min)
• L length of the tunnel furnace (m).
• the roll change is shown in Fig. 4A.
• the casting speed V c according to the above calculation is 6.67 m / min and is accordingly lower than the drawing speed V w .
• the casting speed V c is increased again to the drawing-in speed V v .
• the final rolling thickness and / or the drawing-in speed V w of the rolling train 3 can be increased after the cross-cutting.
• the final roll thickness can be increased by a maximum of 2.5 times.
• Another option is that the final roll thickness is increased by a maximum of a factor of 2 and the casting speed is reduced to a minimum of 30%.
• the casting speed V c is reduced and / or the drawing-in speed V w of the rolling mill 3 and / or the final rolling thickness are increased, after the rolling has ended, the worn rollers 3a of the rolling mill 3 are changed and after the roll change, the casting speed V c is increased to the draw-in speed V w of the rolling train 3.
• the casting and rolling system for semi-endless rolling or continuous rolling of a cast metal or steel strand which can be divided into casting strand partial lengths 20 when required as a casting strand 1a in the solidified state and which keeps the casting strand partial lengths 20 warm in a roller hearth furnace 2 and heated to the rolling temperature and evened out are and then introduced into a rolling mill 3, requires that continuous casting is carried out on the continuous casting machine 1.
• the roller hearth furnace 2 with at least one roller level 24, at the entrance 12a and / or exit 12b of which a transverse dividing device 14, subsequently a descaling device 15, is provided, thereon
• the first roll stand follows and the separating device 16, cooling section 17 and coiler systems 18 are arranged behind the rolling mill 3.
• roller conveyors 11, 13 on the inlet and outlet sides have bending and / or straightening units 7, 8 which can be aligned or set up on the respective roller plane 24.
• the pivotable roller conveyors 11, 13 are provided at the entrance 12a and at the exit 12b of the roller hearth furnace 2 with at least two roller levels 24, each with a bending and / or straightening unit 7, 8 (cf. FIG. 5).
• multiple lengths 21 on several roller levels 24 can be carried out from the exit 9 of the continuous casting machine 1 through the pivotable roller conveyor 11 of the roller hearth furnace 2 via the pivotable roller conveyor 13 into the rolling train 3.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)
• Continuous Casting (AREA)
• Heat Treatment Of Steel (AREA)

Applications Claiming Priority (5)

Publications (2)

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• 2003
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  • 2003-05-02 WO PCT/EP2003/004599 patent/WO2004004938A1/fr not_active Ceased
  • 2003-05-02 EP EP03729965A patent/EP1519798B1/fr not_active Expired - Lifetime
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  • 2003-05-02 MX MXPA05000312A patent/MXPA05000312A/es active IP Right Grant
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