EP1327487B1 - Procede de laminage a chaud sans fin - Google Patents

Procede de laminage a chaud sans fin Download PDF

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Publication number
EP1327487B1
EP1327487B1 EP01970278A EP01970278A EP1327487B1 EP 1327487 B1 EP1327487 B1 EP 1327487B1 EP 01970278 A EP01970278 A EP 01970278A EP 01970278 A EP01970278 A EP 01970278A EP 1327487 B1 EP1327487 B1 EP 1327487B1
Authority
EP
European Patent Office
Prior art keywords
rolling
sheet bar
endless
sheet
materials
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.)
Expired - Lifetime
Application number
EP01970278A
Other languages
German (de)
English (en)
Other versions
EP1327487A1 (fr
EP1327487A4 (fr
Inventor
Futoshi c/o Chiba Works GOTOH
Nobuaki c/o Chiba Works NOMURA
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.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
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 JFE Steel Corp filed Critical JFE Steel Corp
Publication of EP1327487A1 publication Critical patent/EP1327487A1/fr
Publication of EP1327487A4 publication Critical patent/EP1327487A4/fr
Application granted granted Critical
Publication of EP1327487B1 publication Critical patent/EP1327487B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • 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
    • 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
    • B21B15/0085—Joining ends of material to continuous strip, bar or sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/08—Batch rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/10—Endless rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • 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
    • 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
    • B21B37/58—Roll-force control; Roll-gap control

Definitions

  • the present invention relates to a method for setting operating conditions of endless hot rolling.
  • a rolling process for a hot rolled steel sheet is as follows: a slab is heated in a furnace, the heated slab is rolled with a roughing mill to form a sheet bar, and the sheet bar is then rolled with a finishing mill to form a hot rolled steel sheet.
  • the slab, the sheet bar, and the hot rolled steel sheet are collectively referred to as a rolling material.
  • sheet bars rolled with the roughing mill are rolled with the finishing mill one by one.
  • Such a method is known as batch rolling.
  • the tail end of a preceding sheet bar is joined to the leading end of a succeeding sheet bar one after another between a roughing mill and a finishing mill, and the plurality of resulting sheet bars are continuously rolled with the finishing mill without interruption.
  • This technique is known as endless rolling. During actual operation of finish rolling, batch rolling and endless rolling are individually performed.
  • An upper computer predetermines the rolling conditions according to information including the steel type, the standard, the size, the product thickness, the product width, of each rolling material.
  • the rolling material is then fed to a hot rolling line.
  • a lower computer detects the location of the rolling material at many points in the hot rolling line.
  • the lower computer sets the rolling conditions of an apparatus located downstream of the place where the rolling material is detected, according to predetermined rolling conditions.
  • the rolling material is fed to the downstream apparatus and then rolled.
  • Japanese Unexamined Patent Application Publication No. 8-300008 discloses a laser welding equipment in which a vertical aligning device for vertically aligning junction ends is provided to either one or both of a clamping device for a preceding sheet bar and another clamping device for a succeeding sheet bar.
  • Japanese Unexamined Patent Application Publication No. 7-24504 discloses a clamping device for joining sheet bars as follows: the tail end of a preceding sheet bar and the leading end of a succeeding sheet bar which are both heated are vertically clamped with arms individually in such a manner that a clearance is provided between both ends, pressed by moving both arms clamping each end, and then joined together.
  • Another clamping device having a horizontal level-maintaining system including fixing plates for clamping across a sheet bar to another sheet bar is disclosed.
  • FIG. 2 shows equipment disclosed in Japanese Unexamined Patent Application Publication No. 7-24504.
  • reference numerals 16 and 17 denote upstream upper and lower clamps and reference numerals 18 and 19 denote downstream upper and lower clamps.
  • reference numerals 16 and 17 denote upstream upper and lower clamps
  • reference numerals 18 and 19 denote downstream upper and lower clamps.
  • Japanese Unexamined Patent Application Publication No. 10-5830 discloses a technique in which a junction order of materials for endless rolling is determined such that a material to be rolled into a finished steel sheet having a small thickness is rolled in the middle of a rolling order.
  • Japanese Unexamined Patent Application Publication No. 11-169926 discloses a technique in which a rolling method is immediately switched to batch rolling when rolling materials subjected to endless rolling cannot be treated by endless rolling. Thus, rolling conditions are previously determined for both endless rolling and batch rolling.
  • the sheet bar described above is possibly destroyed and the fixing plates clamping sheet bars are bent.
  • the present invention provides a solution to the conventional problems described above. It is an object of the present invention to prevent fixing plates from being damaged, to obtain junction strength in endless rolling, and to reduce a rolling load.
  • the above problems are solved by rolling sheet bars each having the same thickness.
  • an upper computer determines rolling conditions for each rolling material according to information including the steel type, the standard, the size, the product thickness, and the product width.
  • a lower computer performs the following calculations: the lower computer compares the predetermined thicknesses of sheet bars for individual rolling materials from the leading material to the end material, and finds the minimum thickness among them.
  • the above problems are solved by performing rolling in such a manner that the sheet bar thicknesses are set to the minimum thereof.
  • the sheet bar thicknesses are set to the same value for a plurality of rolling materials subjected to endless rolling; hence, the above problems do not arise.
  • FIGS. 3A and 3B show the effects of the present invention. As shown in FIG. 3A, the junction is smoothly fed into rolls for finish rolling. As shown in FIG. 3B, the fixing plates 16 and 17 of the clamping devices are not bent.
  • a tail end 10e of a preceding sheet 10 is joined to a leading end 12t of a succeeding sheet 12 with a joining apparatus 30 provided between a roughing mill 20 having three stands and a finishing mill 40 having seven stands.
  • the preceding sheet 10 and the succeeding sheet 12 joined together are continuously treated in finish rolling.
  • a cutter 50 for rolling materials is provided downstream of the finishing mill 40, and two reels 60 are provided downstream of the cutter 50.
  • the finished rolling material having the preceding sheet 10 and the succeeding sheet 12 joined together is cut into sheets each having a length which is equivalent to the winding capacity of each of the reels 60.
  • a rolling material positioned downstream of the cut point and another rolling material positioned upstream of the cut point are separately wound onto each of the reels in turn.
  • the preceding sheet 10 and the succeeding sheet 12 are continuously rolled without intermittence; thereby performing stable rolling over the entire length.
  • This method is specifically suitable for a rolling material having a small thickness, which causes difficulty in insertion of the rolling material between rolls due to an unstable tip.
  • FIG. 5 is a block diagram showing a control unit used for the present invention.
  • operating conditions of apparatus in the hot rolling line are set by computers.
  • Information including the steel type, the standard, the rolling size, and so on is input with an order input terminal 80 for each slab, which is a rolling material.
  • the information of the slab is sent to an upper computer 70 via, for example, in-house LAN 82.
  • the upper computer 70 determines rolling conditions such as rolling temperature, reduction schedule, rolling rate, tension between stands, and cooling rate for each rolling material.
  • the upper computer sends the rolling conditions to a lower computer 72.
  • the lower computer 72 When the slab is fed into the rolling line, the lower computer 72 reads detection data output by detectors placed at some points in the rolling line.
  • the detectors include a detector 24 placed downstream of the roughing mill, another detector 32 placed downstream of the joining apparatus, and another detector 44 placed downstream of the finishing mill.
  • the detection data include the temperature, the thickness, and the width of the plate.
  • the lower computer 72 simultaneously reads actual operation data of the apparatus.
  • the apparatus includes the roughing mill 20, the joining apparatus 30, the finishing mill 40, the cutter 50, the reels 60, and so on.
  • the actual operation data include rolling forces loaded by a screw-down device 22 of the roughing mill 20 and another screw down-device 42 of the finishing mill 40.
  • a combination of the detection data output by the detectors and the actual operation data of the apparatus is referred to as rolling material information.
  • the lower computer 72 calculates the operating conditions of the apparatus located downstream of the place where the rolling material is currently situated such that the rolling material is rolled under rolling conditions received from the upper computer 70.
  • the lower computer 72 sends operating condition signals based on the calculation results to each apparatus, thus operating the apparatus.
  • the lower computer 72 calculates the operating conditions of the finishing mill 40, that is, roll position and the roll peripheral speed for each stand, according to rolling material information in rough rolling such that finish rolling is performed under finish rolling conditions received from the upper computer 70.
  • the rolling material information in rough rolling includes the size and the temperature of a sheet bar after rough rolling.
  • the information is detected with the detector 24 placed downstream of the roughing mill or is calculated according to the actual operation data of the roughing mill 20.
  • the preceding plate 10 is joined to the succeeding plate 12 with the joining apparatus 30 and the lower computer 72 then calculates the operating conditions of the finishing mill 40 for the succeeding plate 12. After that, the lower computer 72 calculates the operating conditions of the finishing mill 40 such that finish rolling is performed under finish rolling conditions received from the upper computer 70, in the same way as described above.
  • FIG. 6 shows the entire procedure described above.
  • the sheet bar thicknesses predetermined for individual rolling materials are compared and are set to the minimum thereof.
  • the sheet bar thickness is determined for each rolling material.
  • FIG. 7 shows a method of the determination.
  • the sheet bar thickness is retrieved from a setting table registered in the upper computer 70 by using keys such as the steel type, the standard, the rolling size, the instruction thickness after hot rolling, and the instruction width after hot rolling.
  • the sheet bar thickness is preferably registered for each of endless rolling and batch rolling.
  • the predetermined sheet bar thickness is previously input into the table.
  • the following conditions are necessary: (1) reduction in energy loss caused by radiation and (2) a high temperature in finish rolling.
  • the sheet bar thickness is preferably large.
  • the sheet bar thickness is preferably small to reduce the load of the finishing mill.
  • the sheet bar thickness is determined in consideration of the above contradictory conditions.
  • the sheet bar thickness may be determined for batch rolling only or for both batch rolling and endless rolling.
  • the number of rolling materials for endless rolling is n and the sheet bar thickness is determined as t 1 , t 2 , ..., t n for each rolling material according to the above logic.
  • a group consisting of a plurality of rolling materials for endless rolling is referred to as an endless unit.
  • t 1 , t 2 , ..., t n in the endless unit are compared with one another to replace a preset value with the following formula: Min (t 1 , t 2 , ..., t n ).
  • Min ( ) denotes a function selecting the minimum among the plurality of variables in the parentheses.
  • Min (t 1 , t 2 , ..., t n ) may be determined for that.
  • Min (t 1 , t 2 , ..., t n ) may be determined for endless rolling only.
  • the sheet bar thicknesses predetermined for individual rolling materials are compared and the sheet bar thicknesses are set to the minimum thereof.
  • Table 1 shows an exemplary schedule in which the thicknesses of sheet bars for batch rolling are determined and the thicknesses of sheet bars for endless rolling are then determined.
  • Samples shown in Table 1 were manufactured as follows: sheet bars of rolling materials No. 1 to 6 that were the same steel (low carbon steel) were joined together upstream of a finishing mill and were then continuously treated in finish rolling. In conventional batch rolling methods, the thickness of a sheet bar was determined for each rolling material. In contrast, in the endless rolling method, the thicknesses of the sheet bars are set to the minimum thickness of 30 mm (No.4 in Table 4).
  • the sheet bar thicknesses of rolling materials for endless rolling are unified in the unit.
  • a junction between sheet bars is broken due to a force applied to a step formed at the junction from rolls in finish rolling.
  • fixing plates for clamping the step are bent or broken.
  • junction and finish rolling are smoothly performed as shown in FIG. 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Claims (1)

  1. Procédé de laminage à chaud réalisé dans des conditions de laminage préalablement déterminées pour des matériaux de laminage individuels d'après des informations de matériau de laminage incluant le type, la norme, la taille, l'épaisseur du produit et la largeur du produit des matériaux de laminage, dans lequel l'extrémité arrière d'un larget précédent est raccordée à l'extrémité avant d'un larget suivant pour appliquer aux matériaux de laminage un brunissage de finition sans fin, le procédé comprenant les étapes consistant à :
    comparer les épaisseurs de larget prédéterminées pour les matériaux de laminage individuels dans une installation sans fin dans laquelle les matériaux de laminage sont installés avec une partie avant et une partie arrière dans l'ordre du laminage ;
    définir les épaisseurs des largets à leur minimum; et
    réaliser un laminage de finition sans fin.
EP01970278A 2000-10-04 2001-09-28 Procede de laminage a chaud sans fin Expired - Lifetime EP1327487B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2000304973A JP4696348B2 (ja) 2000-10-04 2000-10-04 エンドレス熱間圧延方法
JP2000304973 2000-10-04
PCT/JP2001/008513 WO2002028559A1 (fr) 2000-10-04 2001-09-28 Procede de laminage a chaud sans fin

Publications (3)

Publication Number Publication Date
EP1327487A1 EP1327487A1 (fr) 2003-07-16
EP1327487A4 EP1327487A4 (fr) 2004-03-17
EP1327487B1 true EP1327487B1 (fr) 2005-02-09

Family

ID=18785927

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01970278A Expired - Lifetime EP1327487B1 (fr) 2000-10-04 2001-09-28 Procede de laminage a chaud sans fin

Country Status (7)

Country Link
EP (1) EP1327487B1 (fr)
JP (1) JP4696348B2 (fr)
KR (1) KR100771413B1 (fr)
CN (1) CN1287917C (fr)
DE (1) DE60108890T2 (fr)
TW (1) TW504413B (fr)
WO (1) WO2002028559A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004042481A1 (de) * 2004-09-02 2006-03-23 Stuth, Theodor, Dipl.-Kaufm. Verfahren zur Herstellung von Metallbändern hoher Reinheit aus Kathodenblechen
IT202000000316A1 (it) * 2020-01-10 2021-07-10 Danieli Off Mecc Metodo ed apparato di produzione di prodotti metallici piani

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56158206A (en) * 1980-05-12 1981-12-05 Nippon Steel Corp Continuous rolling method for strip
JP3254067B2 (ja) * 1993-05-07 2002-02-04 川崎製鉄株式会社 エンドレス圧延における板クラウンの制御方法
JPH09216008A (ja) * 1996-02-06 1997-08-19 Sumitomo Metal Ind Ltd 熱間鋼材接合機のプレス機構
JP3461669B2 (ja) * 1996-10-28 2003-10-27 新日本製鐵株式会社 熱間連続圧延鋼板の製造方法

Also Published As

Publication number Publication date
KR20020060755A (ko) 2002-07-18
DE60108890T2 (de) 2005-06-23
JP2002113509A (ja) 2002-04-16
EP1327487A1 (fr) 2003-07-16
EP1327487A4 (fr) 2004-03-17
CN1287917C (zh) 2006-12-06
KR100771413B1 (ko) 2007-10-30
DE60108890D1 (de) 2005-03-17
CN1392806A (zh) 2003-01-22
TW504413B (en) 2002-10-01
JP4696348B2 (ja) 2011-06-08
WO2002028559A1 (fr) 2002-04-11

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