EP1824617B1 - Verfahren zum giess-walzen mit erhöhter giessgeschwindigkeit und daran anschliessendem warmwalzen von relativ dünnen metall-, insbesondere stahlwerkstoff-strängen, und giess-walz-einrichtung - Google Patents

Verfahren zum giess-walzen mit erhöhter giessgeschwindigkeit und daran anschliessendem warmwalzen von relativ dünnen metall-, insbesondere stahlwerkstoff-strängen, und giess-walz-einrichtung Download PDF

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Publication number
EP1824617B1
EP1824617B1 EP06829594A EP06829594A EP1824617B1 EP 1824617 B1 EP1824617 B1 EP 1824617B1 EP 06829594 A EP06829594 A EP 06829594A EP 06829594 A EP06829594 A EP 06829594A EP 1824617 B1 EP1824617 B1 EP 1824617B1
Authority
EP
European Patent Office
Prior art keywords
rolling
temperature
work roll
strip
continuous casting
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.)
Revoked
Application number
EP06829594A
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German (de)
English (en)
French (fr)
Other versions
EP1824617A1 (de
Inventor
Jürgen Seidel
Jürgen Klöckner
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 Group GmbH
Original Assignee
SMS Siemag 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=37859079&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1824617(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by SMS Siemag AG filed Critical SMS Siemag AG
Priority to PL06829594T priority Critical patent/PL1824617T3/pl
Publication of EP1824617A1 publication Critical patent/EP1824617A1/de
Application granted granted Critical
Publication of EP1824617B1 publication Critical patent/EP1824617B1/de
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • 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
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B28/00—Maintaining rolls or rolling equipment in effective condition
    • B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
    • B21B28/04—Maintaining rolls in effective condition, e.g. reconditioning while in use, e.g. polishing or grinding while the rolls are in their stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0035—Forging or pressing devices as units
    • B21B15/005—Lubricating, cooling or heating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B21B27/106—Heating the rolls
    • 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
    • B21B31/07—Adaptation of roll neck bearings
    • 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 for casting rolling with increased casting speed and subsequent hot rolling of relatively thin metal, especially steel material strands to thin hot strip in a multi-stand hot strip finishing train under the rules of the temperatures of the work rolls, and the associated casting-rolling device ,
  • Rolling at (high) casting speeds i. a coupling of a continuous casting plant and a hot strip finishing train leads to relatively low transport speeds within the hot strip finishing train downstream of a continuous casting plant.
  • high initial temperatures for example of about 1250 ° C
  • a required final rolling temperature of about 850 ° C under normal conditions. Large amounts of energy are released to the work rolls.
  • Such conventional conditions exist, for example, in a continuous casting, which allows high casting speeds and high initial temperatures for the hot strip finishing train results.
  • the invention is based on the objective of achieving a reduction in the temperature loss on the hot strip within the hot strip finishing train during casting rolling, so that the target rolling temperature can be set more precisely and in particular higher at the end of the rolling process.
  • the stated object is achieved in that at casting speeds of about 4 m / min to 12 m / min and considering relatively thin casting thicknesses of the cast strand rolling speeds, the temperatures of the work rolls are increased starting from a low initial temperature with a predetermined rate of increase and the strip temperature is set within the hot strip finishing train to a target rolling temperature of the hot strip and / or by regulating or controlling the intensity of the roll cooling.
  • the roller cooling is adjusted depending on external boundary conditions so that the work roll slowly reaches the target temperature (of about 400 ° C) with the predetermined rate of increase and is in the range of tempering temperature of the roll material.
  • a coupling of the casting-rolling process takes place, for example, at casting speeds between 4 and 12 m / min and usual casting thicknesses of 20 to 90 mm and at rolling speeds of about 0.3 to 18 m / sec.
  • a further development consists in the fact that given given schedule data, a target temperature is set which is below the tempering temperature of the roll material of the work rolls.
  • a further development is that by applying a predetermined amount of cooling water to the work rolls, a maximum roll temperature and the belt speed are set by which the predetermined belt target temperature is achieved.
  • the temperature difference between the work roll core and the work roll surface of the work roll is adjusted so that the allowable stresses in the work roll are not exceeded.
  • a voltage monitoring within the work roll both in the radial and in the axial direction due to a calculated temperature and voltage field can be performed.
  • the work roll may also be preheated to an initial temperature prior to use. At a preheating temperature of 200 ° C, the stationary state is reached faster and / or the voltage level in the rollers is lower.
  • An improvement of the process sequence provides that the inductive heating of the work roll surface is carried out on the inlet side of a roll stand. This increases the work roll contact temperature in the nip and minimizes the heat loss of the belt within the nip. The desired effect is set even before reaching a high core temperature.
  • a particularly to be mentioned measure is that during the starting process in addition to the intensity of the roll cooling and / or the inductive heating of the rolling program is used as a control variable.
  • An improvement of the boundary conditions to reduce the strip temperature loss further occurs by the fact that planned scale scrubber with minimum amount of water, in particular single row, are operated.
  • Another approach to adjusting the cooling effect is that the cooling intensity of the work roll cooling is controlled by finely metered coolant and / or spray.
  • the casting / rolling apparatus requires a known continuous casting apparatus and a hot strip finishing train, a heating device, and a work roll cooling means associated with each stand.
  • the training and development of the hot strip finishing train is that the length of the work rolls is tuned to an increase in temperature and that the work roll bearings are cooled and connected to an oil circulation lubrication or lubricated by special grease. As a result, the temperature increases (rates of increase) can be safely collected at the bearings.
  • Another measure to save heating energy and increase the work roll utilization time is that the work rolls are ground while warm.
  • HIP hot isostatic pressing
  • Other features include, in an online computing model, a work-roll temperature model based on the measured work-roll surface temperatures, the initial temperature of the work roll, and the physical properties of the work roll.
  • the work roll temperature model takes into account the maximum average roll surface temperature, the maximum permissible temperature difference between the work roll core and the work roll surface and the maximum permissible stress in the work roll also has an effect.
  • Another measure to counteract a high temperature loss of the hot strip is that between the rolling stands roller shutter covers are installed.
  • a further embodiment provides that at least the rolling force, the inlet and outlet thickness, the rolling speed, the strip temperature, the scale layer thickness and the strip material are taken into account under the pass schedule parameters.
  • the thickness decrease in the pass schedule is shifted to the rear of the hot strip finishing train.
  • a hot strip finishing train with about seven rolling stands for a G umanstrangdicke of H 50 to 90 mm and a minimum outlet thickness of 0.6 to 1.2 mm is provided.
  • a hot strip finishing train 3 for metal in particular for a steel material strand 1, in discontinuous operation in the thin strip production, for example, about 180 sec rolled, followed by a rolling break of about 20 sec.
  • a mean work roll surface temperature 19 of about 120 ° C sets in and during the break, the surface is cooled back to near water temperature.
  • Variety of rolled hot strips 2 can be measured at the end of the rolling program roller temperatures of about 90 ° C.
  • Fig. 1 Work roll temperature over time
  • the temperature profile without a work roll cooling 18 having an average surface temperature 19 and a core temperature 20 shown.
  • a conventional work roll cooling system 21 shows the approximation of the core temperature 20 (from, for example, 20 ° C.) to the average surface temperature 19 (of, for example, 120 ° C.). It can be seen that after the working time has progressed, the core temperature 20 approaches the average surface temperature 19 under otherwise identical rolling conditions and is then largely the same.
  • the goal is therefore to meter the roll cooling in dependence on external boundary conditions so that the work roll 4 with a predetermined rate of increase the target temperature 6 in Fig. 2 of about 400 ° C and is below the tempering temperature of the roll material.
  • the temperature field within the work roll 4 or the temperature difference between Walzenkem 4a and roll surface 4b must be adjusted so that the allowable stresses in the work roll 4 are not exceeded. This process applies in the radial and also in the axial direction. For this the on-line calculation model in Fig. 3 used.
  • the dashed curve shows a reduced work roll cooling 22 according to the invention at an elevated average surface temperature 19a for the purpose of setting specifically increased work roll temperatures at a prewarmed work roll 4 to an initial temperature 5 of, for example. 200 ° C initially a temperature difference 23 to the core temperature 20.
  • the warmer work roll 4 thus prevents unwanted lowering of the strip temperature 15 by the average surface temperature 19a, the bspw. at 400 ° C.
  • Fig. 3 is the online calculation model 7 in outline.
  • the work roll temperature model 9 the calculation of the work roll temperatures, the roll cooling water amounts and the stresses in the work roll 4 takes place. At least the following parameters are included in the calculation: a maximum mean surface temperature 19, a maximum permissible temperature difference 23 between core and surface and maximum permissible stress values 24 in the work roll 4.
  • pass parameters 11 are provided: the rolling force 12, the inlet and outlet thickness 13, the rolling speed 14, the strip temperature 15, a scale layer thickness 16 and the strip material 17 itself.
  • Fig. 4 shows as an example a hot strip finishing train 3 and the course of the strip temperature 15 for different boundary conditions.
  • a scale scrubber 25, which is preferably single-row, is upstream.
  • all rolling stands 3a ... 3n are operated at an elevated work roll temperature, for example at 400 ° C. at F1 - F7, this has a positive effect on the local strip temperature 15.
  • an initial temperature 5 of 1180 ° C behind the tinder scrubber 25 and a target temperature 6 of 910 ° C.
  • an inadmissibly low strip temperature 15 of, for example, 805 ° C. is established Fig. 4 can be seen by the dashed curve.
  • the intensity of the inductive heating 8a of the work roll 4 can also be predetermined differently over the roll length.
  • the procedure or the course of the work roll cooling water amount 26 is in Fig. 5 shown. Compared to a "normal" amount of cooling water, a smaller amount is usually used in this process at the beginning of the illustrated endless rolling process and further reduced with increase in the roll core temperature 20 to a predetermined by the online computing model 7 target amount.
  • the method described for reducing the heat dissipation to the work rolls 4 is not limited to the illustrated application of continuous rolling with relatively long rolling times and low rolling speeds.
  • the method can also be applied to conventional single or multi-stand hot strip rolling mills.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)
EP06829594A 2006-01-10 2006-12-14 Verfahren zum giess-walzen mit erhöhter giessgeschwindigkeit und daran anschliessendem warmwalzen von relativ dünnen metall-, insbesondere stahlwerkstoff-strängen, und giess-walz-einrichtung Revoked EP1824617B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06829594T PL1824617T3 (pl) 2006-01-10 2006-12-14 Sposób odlewania z walcowaniem, o podwyższonej szybkości odlewania i następującym po nim walcowaniem na gorąco stosunkowo cienkich pasm metalu, zwłaszcza materiału stalowego, oraz zespół odlewniczo-walcowniczy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006001195A DE102006001195A1 (de) 2006-01-10 2006-01-10 Verfahren zum Gieß-Walzen mit erhöhter Gießgeschwindigkeit und daran anschließendem Warmwalzen von relativ dünnen Metall-,insbesondere Stahlwerkstoff-Strängen,und Gieß-Walz-Einrichtung
PCT/EP2006/012036 WO2007079898A1 (de) 2006-01-10 2006-12-14 Verfahren zum giess-walzen mit erhöhter giessgeschwindigkeit und daran anschliessendem warmwalzen von relativ dünnen metall-, insbesondere stahlwerkstoff-strängen, und giess-walz-einrichtung

Publications (2)

Publication Number Publication Date
EP1824617A1 EP1824617A1 (de) 2007-08-29
EP1824617B1 true EP1824617B1 (de) 2011-08-24

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ID=37859079

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EP06829594A Revoked EP1824617B1 (de) 2006-01-10 2006-12-14 Verfahren zum giess-walzen mit erhöhter giessgeschwindigkeit und daran anschliessendem warmwalzen von relativ dünnen metall-, insbesondere stahlwerkstoff-strängen, und giess-walz-einrichtung

Country Status (20)

Country Link
US (2) US7958931B2 (https=)
EP (1) EP1824617B1 (https=)
JP (1) JP4751403B2 (https=)
KR (1) KR100859291B1 (https=)
CN (1) CN101107085B (https=)
AR (1) AR058960A1 (https=)
AT (1) ATE521425T1 (https=)
AU (1) AU2006324143B2 (https=)
BR (1) BRPI0606382A2 (https=)
CA (1) CA2636305C (https=)
DE (1) DE102006001195A1 (https=)
EG (1) EG24640A (https=)
ES (1) ES2369292T3 (https=)
MX (1) MX2007007367A (https=)
PL (1) PL1824617T3 (https=)
RU (1) RU2344889C1 (https=)
TW (1) TWI373386B (https=)
UA (1) UA89975C2 (https=)
WO (1) WO2007079898A1 (https=)
ZA (1) ZA200707158B (https=)

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Publication number Priority date Publication date Assignee Title
CN104338759A (zh) * 2014-10-12 2015-02-11 首钢总公司 一种超低碳钢热轧盘条表面环形粗晶的控制方法

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DE102006001195A1 (de) 2007-07-12
AR058960A1 (es) 2008-03-05
WO2007079898A1 (de) 2007-07-19
ZA200707158B (en) 2008-04-30
AU2006324143B2 (en) 2008-12-04
CN101107085B (zh) 2012-11-14
US20080093049A1 (en) 2008-04-24
KR100859291B1 (ko) 2008-09-19
MX2007007367A (es) 2007-08-14
KR20070089807A (ko) 2007-09-03
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