EP2155410A1 - Procédé de fabrication d'une tôle dans un train de laminoir - Google Patents

Procédé de fabrication d'une tôle dans un train de laminoir

Info

Publication number
EP2155410A1
EP2155410A1 EP08774108A EP08774108A EP2155410A1 EP 2155410 A1 EP2155410 A1 EP 2155410A1 EP 08774108 A EP08774108 A EP 08774108A EP 08774108 A EP08774108 A EP 08774108A EP 2155410 A1 EP2155410 A1 EP 2155410A1
Authority
EP
European Patent Office
Prior art keywords
coating
rolling
volume
nickel
range
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Withdrawn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
EP08774108A
Other languages
German (de)
English (en)
Inventor
Thomas SÖNTGEN
Robert Wagner
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP2155410A1 publication Critical patent/EP2155410A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B21B1/22—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force
    • 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
    • B21B27/02—Shape or construction of rolls
    • B21B27/021—Rolls for sheets or strips
    • 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
    • B21B27/02—Shape or construction of rolls
    • B21B27/03—Sleeved rolls
    • 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
    • B21B27/02—Shape or construction of rolls
    • B21B27/03—Sleeved rolls
    • B21B27/032—Rolls for sheets or strips

Definitions

  • the invention relates to a method for producing a sheet in a rolling train.
  • the starting material for the production of sheet metal is usually called a slab metal block, which comes from a steel plant, such as a continuous casting plant.
  • Rolling of the metal block first by hot rolling and then usually by cold rolling plates are produced in a desired thickness.
  • the slab or the raw sheet is passed through a plurality of successive stands in a rolling mill in a continuous process.
  • the rolling stands in this case each have work rolls, between which passes through the sheet to be rolled and which are pressed against the sheet with a rolling pressure.
  • the work rolls are usually performed with the help of support rollers against the sheet. Due to the occurring during rolling high mechanical and in the case of hot rolling and thermal stresses the work rolls are exposed to high wear. They are therefore provided with a wear coating, usually made of chromium.
  • the rolling speed is largely determined by the load capacity of the work rolls.
  • the invention has for its object to improve the load capacity of the work rolls, in particular to allow a more cost-effective production of a sheet in a rolling mill.
  • the object is achieved according to the invention by the method according to claim 1. Thereafter, it is provided that for the manufacture of the sheet metal is guided by work rolls, which provided with a coating of a ductile metallic material with embedded therein hard material particles are, wherein the rolling a rolling pressure of more than 2 GPa is set.
  • Such a coating has a particularly good abrasion resistance, so that overall a significantly longer service life for the work roll is achieved with such a coating, i. the work roll can be used for longer periods in production, whereby the cost of replacement work rolls and downtime of the rolling mill are reduced.
  • the good, in particular ductile properties of the coating also makes it possible for the work rolls to be exposed to a very high rolling pressure, which can be more than 2 GPa.
  • a rolling pressure of more than 3 GPa and in particular a rolling pressure in the range of 4 to 6 GPa is set. Due to the special resistance of the special coating of the ductile metallic base material with the embedded hard material particles, this is possible without the risk of damage to the coatings. In today usually used work rolls they are provided with a chromium coating, which can be acted upon only with a limited pressure. In fact, at higher pressures, embrittlement of the coating occurs, which can lead to flaking.
  • Under ductile metallic base material is understood here a relatively soft metallic base material having a Vickers hardness of about 180-230 HV 0 I maximum. Hardness determination according to Vickers is the norm
  • the embedded hard material particles have a significantly higher hardness, for example a hardness that is more than a factor of 2 greater than that of the base material.
  • the work rolls are provided with a coating that can withstand extreme loads.
  • the ductility compared with a consistently hard and brittle coating, there is a distinctly lower risk that the coating will be damaged during the course of operation and cracks or microcracks occur.
  • the risk of spalling of portions of the coating under mechanical stress due to the high ductility is significantly lower than in a brittle coating.
  • the embedded hard particles result in a very high level of abrasion resistance and thus an almost very high surface hardness, so that a long service life is achieved even under high mechanical loads and high abrasion forces.
  • nickel or a nickel alloy is used as the base material.
  • the nickel content in a nickel alloy is preferably in the range between 65 and 95% by volume and is in particular in the range of about 75% by volume, based in each case on the total volume of the coating.
  • alloying components tungsten and / or iron and / or cobalt are preferably provided. Particular preference is given here Cobalt used.
  • a coating consisting of the components nickel, tungsten and iron has been found to be suitable.
  • the proportion of alloying components is in a range between about 10 and 20% by volume.
  • the proportion of the hard material particles is preferably in a range between 1 and 50% by volume, in particular in the range between 15% by volume and 30% by volume.
  • the hard particles preferably have a size in the nanoscale range, for example in the range between 50 and 1000 nm
  • Boron carbide particles, tungsten carbide particles or diamond particles are preferably used as hard material particles.
  • ceramic particles, such as the boron carbide particles, which are distinguished by their extremely high hardness, are therefore used.
  • the thickness of the coating is preferably in the range between about 0.7 to about 6 mm and is in particular in the range between about 2 and 3 mm. It has been shown that the coating with such a layer thickness particularly meets the high requirements.
  • the coating is preferably applied using a so-called horizontal rotary coating method known per se in roller coatings.
  • the coating is applied as a viscous mass to the rotating body successively with the aid of an application tool, wherein the application tool is moved continuously in the longitudinal direction of the rotating body.
  • the coating is applied electrolytically.
  • the component to be coated is immersed in one or more electroplating baths.
  • Electrode is an electrode consisting of the base material, for example a nickel or a nickel alloy electrode used.
  • the hard materials are added to the electroplating bath, so that they migrate with the metal ions of the nickel electrode to the component to be coated, where they are deposited together with the nickel ions forming the matrix.
  • a hard coating on the ductile coating is provided. That On the nickel base layer with the incorporated therein hard material particles, a continuous further layer is applied with a material of very high hardness, in particular with a hardness, for example, over 1000 HV.
  • a diamond coating is applied.
  • Such a diamond coating in particular in combination with the underlying nickel or nickel alloy coating, has an extremely high impermeability, a very good thermal conductivity, an extremely high hardness and very low abrasion.
  • the diamond coating has a thickness of approximately up to 0.5 mm.
  • the thickness of the ductile coating is only in the range of about 0.1 mm to about 3 mm.
  • the thickness of the ductile coating with the hard particles be lower as compared with a coating without the diamond coating.
  • the coating with the nickel or nickel alloy matrix which can also be referred to as a base coating, serves in the manner of an adhesion promoter layer in order to be able to apply the diamond coating to the material of the base body, for example steel or copper, safely and permanently.
  • the diamond coating is in this case preferably applied by means of a CVD (chemical vapor deposition) method in order to ensure a secure and lasting connection with the underlying coating.
  • CVD chemical vapor deposition
  • FIG. 2 shows a simplified partial sectional view through a work roll, which is provided exclusively with the base coating, as well as
  • FIG 3 shows a simplified partial sectional view through a work roll, which is provided with a layer system consisting of a base coat and a diamond coating.
  • the greatly simplified illustrated rolling train 2 comprises a plurality of rolling stands 4, which are arranged one after the other in indicated by the arrow conveyor or transport direction 6.
  • Each of the rolling stands has two opposing work rolls 8, which are each supported by support rollers 10 and pressed against a blank sheet 12 to be rolled.
  • the raw sheet 12 is still the slab.
  • the sheet 12 is usually wound by means of a reel to form a coil.
  • the work rolls 8 are pressed with a rolling pressure p acting in the direction of the blank sheet 12 against the blank sheet 12 to be rolled.
  • the work roll 8 itself is therefore also exposed to this rolling pressure p.
  • rolling pressure p a pressure greater than two Gpa and in particular a pressure in the range between three and six Gpa is exercised.
  • the main body consists for example of steel.
  • the base coat 38 comprises, in addition to the nickel matrix designated as the base material 39, a proportion of hard material particles 40, in particular boron carbide particles.
  • hard material particles 40 in particular boron carbide particles.
  • the use of nickel as the matrix material in combination, in particular of boron carbide, for the hard material particles 40 produces a very gas-tight and therefore corrosion-resistant coating, as well as a very good thermal conductivity coating with at the same time very high surface hardness and low abrasion.
  • the high gas tightness is achieved by the nickel matrix already at a very small layer thickness of about 10 microns. Compared to a micro-cracked hard chrome coating therefore improved corrosion resistance is given. Due to the good thermal conductivity of the nickel base material 39, the coating as a whole also has a high thermal conductivity, so that rapid heat removal is ensured. The mechanical resilience of the coating is achieved in particular by the embedded hard material particles 40, which partly project beyond the surface 44 formed by the nickel matrix 39, so that only the hard material particles 40 come into contact with the metal sheet 12. The hard material particles 40 are evenly distributed homogeneously in the matrix 39.
  • nano-hard particles 40 are used in order to achieve a high surface quality.
  • the proportion of hard material particles 40 for such rolls 8 is also in the upper range between 15 and 25% by volume.
  • a coating based on a nickel-cobalt alloy for example, has a composition of about 63% by volume of nickel, 12% by volume of cobalt and 25% by volume of boron carbide particles 40.
  • the thickness D1 of the base coat 38 is in this case in the lower range between 0.5 and 2mm.
  • the thickness D2 of the diamond coating is about 0.5 mm.
  • the service life of the work rolls 8 is increased in each case by approximately 4 to 6 times in comparison with a hard chrome coating.
  • the improvement in service life is many times greater.
  • the life of the work rolls 8 are considerably extended by the coating measures described here, resulting in lower operating costs.
  • the coating allows a high rolling pressure p to be achieved by the additional cost savings due to a higher rolling speed and / or a reduced number of rolling stands.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Metal Rolling (AREA)

Abstract

L'invention vise à réduire les coûts de fonctionnement d'un train de laminoir (2) pour la fabrication d'une tôle (12). A cet effet, des cylindres de travail (8) du train de laminoir (2) sont pourvus d'un revêtement spécial (38) composé d'un matériau de base ductile (39) renfermant des particules solides (40) intégrées au matériau de base. Par ailleurs, lors du laminage, les cylindres de travail (8) sont comprimés avec une pression de laminage (p) de plus de 2 GPa contre la tôle à laminer (12). Ces pressions élevées permettent d'obtenir des vitesses de laminage plus élevées et/ou de réduire le nombre de cylindres de travail (8).
EP08774108A 2007-06-20 2008-06-17 Procédé de fabrication d'une tôle dans un train de laminoir Withdrawn EP2155410A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710028824 DE102007028824B3 (de) 2007-06-20 2007-06-20 Verfahren zur Herstellung eines Blechs in einer Walzstraße
PCT/EP2008/057598 WO2008155320A1 (fr) 2007-06-20 2008-06-17 Procédé de fabrication d'une tôle dans un train de laminoir

Publications (1)

Publication Number Publication Date
EP2155410A1 true EP2155410A1 (fr) 2010-02-24

Family

ID=39671823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08774108A Withdrawn EP2155410A1 (fr) 2007-06-20 2008-06-17 Procédé de fabrication d'une tôle dans un train de laminoir

Country Status (5)

Country Link
EP (1) EP2155410A1 (fr)
CN (1) CN101715373A (fr)
DE (1) DE102007028824B3 (fr)
UA (1) UA91953C2 (fr)
WO (1) WO2008155320A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5683082B2 (ja) * 2009-07-29 2015-03-11 三菱日立製鉄機械株式会社 作業ロールシフト機能を具備した圧延機
CN104550585A (zh) * 2014-12-15 2015-04-29 贵州安大航空锻造有限责任公司 结构钢厚壁环锻件的轧制成形方法
CN104550584A (zh) * 2014-12-15 2015-04-29 贵州安大航空锻造有限责任公司 钴基高温合金厚壁环锻件的轧制成形方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE710146C (de) * 1939-04-04 1941-09-05 Edelstahlwerke Akt Ges Deutsch Verfahren zur Herstellung von Walzen mit Stahlkern und Mantel aus Hartmetall
BE901055A (fr) * 1984-11-14 1985-05-14 Centre Rech Metallurgique Procede de traitement superficiel d'un cylindre de laminoir.
US5537851A (en) * 1993-01-05 1996-07-23 Aluminum Company Of America Sheet product produced by massive reduction in last stand of cold rolling process
SE504707C2 (sv) * 1995-07-14 1997-04-07 Sandvik Ab Kompositvalls med hårdmetall och gjutjärn
EP0998988B1 (fr) * 1998-03-24 2004-06-09 JFE Steel Corporation Procede de fabrication d'une bande laminee brillante d'acier inoxydable lamine a froid
DE102005061134A1 (de) * 2005-12-19 2007-06-21 Siemens Ag Bauteil eines Stahlwerks, wie Stranggussanlage oder Walzwerk, Verfahren zur Herstellung eines solchen Bauteils sowie Anlage zur Erzeugung oder Verarbeitung von metallischen Halbzeugen
DE102006011384B4 (de) * 2006-03-09 2019-09-05 Sms Group Gmbh Rolle zur Metallbearbeitung, insbesondere Stranggießrolle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008155320A1 *

Also Published As

Publication number Publication date
DE102007028824B3 (de) 2009-02-19
WO2008155320A1 (fr) 2008-12-24
CN101715373A (zh) 2010-05-26
UA91953C2 (ru) 2010-09-10

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