CN101715373A - Method for producing a sheet metal in a rolling train - Google Patents

Method for producing a sheet metal in a rolling train Download PDF

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Publication number
CN101715373A
CN101715373A CN200880020699A CN200880020699A CN101715373A CN 101715373 A CN101715373 A CN 101715373A CN 200880020699 A CN200880020699 A CN 200880020699A CN 200880020699 A CN200880020699 A CN 200880020699A CN 101715373 A CN101715373 A CN 101715373A
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CN
China
Prior art keywords
coating
volume percentage
hard material
working roll
nickel
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.)
Pending
Application number
CN200880020699A
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Chinese (zh)
Inventor
T·桑特根
R·瓦格纳
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Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of CN101715373A publication Critical patent/CN101715373A/en
Pending legal-status Critical Current

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    • 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

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

Abstract

In order to reduce operating costs in a rolling train (2) for producing a sheet metal (12), working rolls (8) of the rolling train (2) are provided with a special coating (38) composed of a ductile base material (39) having hard material particles (40) embedded therein. In addition, it is provided that during rolling the working rolls (8) are pressed against the sheet metal to be rolled (12) with a rolling pressure (p) of higher than 2 GPa. Due to these high pressures, it is possible to achieve higher rolling speeds and/or reduce the amount of working rolls (8) involved.

Description

Be used for making the method for sheet material at milling train
Technical field
The present invention relates to a kind of method that is used for making sheet material at milling train.
Background technology
The initial product of making sheet material normally is called as the metal derby of slab, and this metal derby derives from steel mill, such as deriving from continuous casting installation for casting.Just at first carry out hot rolling and next carry out the cold rolling sheet material that just can produce desired thickness usually by metal derby is rolled.In this process, the frame that slab in the milling train or original plate are arranged successively by a plurality of priorities in continuous process.Frame has working roll separately, and the sheet material that be rolled passes between working roll and working roll pushes towards sheet material with certain draught pressure.Working roll is guided towards sheet material under the help of backing roll this moment usually.Because high mechanical stress that produces in the operation of rolling and the thermal stress that produces under the hot rolling situation, working roll are born high wearing and tearing.Therefore they are provided with the abrasion resistant coating of being made by chromium usually.Mill speed is mainly decided by the load capacity of working roll.
Summary of the invention
Task of the present invention is, improves the load capacity of working roll, especially makes sheet material with lower cost to be implemented in the milling train.
This task will solve in accordance with the method for claim 1 according to the present invention.According to the present invention, in order to make sheet material, by working roll, these working rolls are provided with the coating of being made up of the hard material particle of ductile metal material and wherein embedding with the sheet material guiding, and draught pressure is set to greater than 2GPa in the operation of rolling simultaneously.
This coating of being made up of ductile metal base material and wherein embedded hard material particle is not having described in the disclosed German application DE 10 2,005 061 134.6 the applicant.
This coating has extraordinary scuff resistance; therefore can make working roll have significantly longer service life generally by this coating; that is to say; working roll can use in longer time range in the mill, replaces the cost of working roll and the downtime that has reduced milling train so reduced.
Can make working roll can bear very high draught pressure by the good particularly ductile performance of this coating in addition, this draught pressure can be greater than 2GPa.
Owing to can reach than the remarkable higher draught pressure of at present general working roll, therefore can improve mill speed and can improve processing speed on the whole thus.Scheme or additional project as an alternative can be under the identical condition of milling equipment production capacity be used less frame on the whole, thereby can be reduced cost greatly thus by higher draught pressure.
Can be arranged to draught pressure greater than 3GPa especially and especially draught pressure is arranged on 4 arrive in the scope of 6GPa at this.Can realize so high draught pressure and not have the danger that damages coating by the special resistance of the special coating formed by ductile metal base material and wherein embedded hard material particle.
Be provided with the chromium coating on the general at present working roll that uses, it can only bear limited pressure.This coating will become fragile under higher pressure, thereby cause fragmentation.
Ductile metal base material can be regarded as a kind of softer metal base material relatively at this, and its Vickers hardness is about 180-230 HV to the maximum 01Determining of Vickers hardness according to standard DIN EN ISO 6507.Opposite with this basic material, embedded hard material particle has obviously higher hardness, such as than the big hardness more than 2 times of basic material.
By the combination of ductile material and wherein embedded hard material particle, working roll has the coating that bears extreme loads.Compare with the coating of fragility with rigid continuously, ductility has significantly reduced damage coating and the danger that crackle or fine crack occur when work.With respect to the fragility coating,, particularly greatly reduce the danger of part fragmentation under mechanical load of coating owing to high ductibility.Obtained very high scuff resistance and therefore seemed very high case hardness by embedded hard material particle simultaneously, so even under very high mechanical load and abrasive forces, also can reach the long life.
Suitable is to use nickel or nickel alloy as basic material.In nickel alloy, the share of nickel correspondingly preferably is in 65 to 95 scopes between the volume percentage point with respect to the coating cumulative volume, and especially is in the scope of about 75 volume percentage points.Partly be preferably tungsten and/or iron and/or cobalt as alloy composition.Especially preferably use cobalt at this.By nickel, the coating that tungsten and these parts of iron are formed shows equally and is fit to.
Suitable at this is that the share of alloy composition part is in the scope between about 10 to 20 volume percentage points.The share of hard material particle preferably is in 1 to 50 scope between the volume percentage point in addition, particularly is in 15 to 30 scopes between the volume percentage point.
Hard material particle preferably has the size in the nano level scope in addition, in the scope between 50 to 1000nm.
Preferably use boron carbide particles at this as hard material particle, tungsten carbide particle or diamond particles.Particularly use ceramic particle such as boron carbide particles, its salient point is the hardness that it is high.
Coating layer ranges in thickness preferably is in about 0.7 the scope between about 6mm, and is in especially in the scope between about 2 to 3mm.Studies show that the coating with this bed thickness can satisfy high request especially.
Coating preferably applies with the known coating method that horizontally rotates in so-called and the roller coating.In this method, coating is applied to by coated tool on the basic body of rotation continuously as the material of thickness, wherein coated tool continuously the basic body of rotation vertically on motion.
Scheme as an alternative, coating applies in the mode of electrolysis.In order to form coating, parts that will coating immerse in one or more electroplating pool.Use the electrode of making by basic material as electrode, such as nickel or nickel alloy electrode.At this hard material is added in the electroplating pool, thereby the metal ion of they and nickel electrode moves to the parts of wanting coating together and deposits together with the nickel ion of formation matrix there.
In a kind of suitable improvement project, hard coating is set on the ductile coating.That is to say, on nickel basal layer, apply with embedding hard material particle wherein other have hardness very high, particularly for example hardness greater than the continuous layer of the material of 1000HV.Particularly diamond coated layer.This diamond layer particularly with its below nickel or nickel alloy layer is combined has high sealing, extraordinary thermal conductance, high hardness and very small wearing and tearing.The wear life of the working roll in equipment of hot rolling is significantly improved more than ten times with comparing with the parts of hard chrome coating.
The thickness of diamond layer is approximately below the 0.5mm at this.If applied diamond layer, so ductile coating layer ranges in thickness only is in about 0.1mm in the scope of about 3mm.Because mechanical performance is mainly guaranteed by diamond layer in this case, compare preferably littler with the coating that does not have diamond layer so have the ductile coating layer ranges in thickness of hard material particle.The coating that is also referred to as basal layer with nickel or nickel alloy matrix this according to the type that increases attached layer be used to make diamond layer can be reliably and the material that is applied to basic body muchly such as steel or copper.
Diamond layer preferably applies by means of CVD (chemical vapour deposition (CVD)) method at this, thereby guarantees itself and reliable and permanent being connected of following coating.
Description of drawings
To further specify embodiments of the invention by diagram below.Schematic diagram and sketch have been showed respectively:
Fig. 1 is the milling train with a plurality of frames,
Fig. 2 is the phantom of simplification that only has the working roll of basal layer, and
Fig. 3 is the phantom of simplification with working roll of coating system, and this coating system is made up of basal layer and diamond layer.
The parts of same purpose are represented with same Reference numeral in each figure.
The specific embodiment
Very the milling train 2 of reduced representation comprises a plurality of frames 4, and transmission or transporting direction 6 that these frames are represented according to arrow are successively arranged successively.Each frame has two opposed working rolls 8, and it is supported by backing roll 10 respectively and pushes towards the original plate 12 that will be rolled.When the operation of rolling began, original plate 12 remained slab.When rolling, the thickness of original plate 12 reduces in a kind of mode that does not further describe here, finally has required final thickness up to it.At the end of milling train 2, sheet material 12 generally is wound into coiled material by coiling machine.
In order to be rolled, working roll 8 pushes towards the original plate 12 that will be rolled with a draught pressure p towards original plate 12 directive effects.Therefore working roll 8 self is also bearing this draught pressure p.As draught pressure p, apply pressure, and particularly apply the pressure in the scope that is between 3 to 6GPa greater than 2Gpa.
This high draught pressure p particularly reaches by the special coating of working roll 8, and the salient point of this coating is, has embedded hard material particle 40 in ductile metal base material 38 the insides.With compare such as parts with hard chrome coating, especially greatly improved the wear life and the service life of working roll 8 by coating 38.
To further describe the structure and the composition of coating or coating system by Fig. 2 and Fig. 3 below.
On the basic body 37 of working roll 8, applied the following Ni-based coating that is called basal layer 38 by electrolysis mode respectively.The basis body is such as being formed from steel.
Basal layer 38 also comprises a part of hard material particle 40, particularly boron carbide particles except that the Ni substrate that is called basic material 39.By use nickel as matrix material with can obtain having the very good air-tightness and the coating of corrosion resistance and thermal conductance thus with boron carbide as the combination of hard material particle 40 especially, it has very high case hardness and wearing and tearing seldom simultaneously.
The Ni substrate of the very small bed thickness by only having about 10 μ m just can reach high air-tightness.Compare with hard chrome coating so improved corrosion resistance with fine crack.Because Ni-based plinth material 39 has good thermal conductance, this coating also has high thermal conductance on the whole, thereby has guaranteed distributing rapidly of heat.
The mechanical load ability of coating realizes that by the hard material particle 40 that embeds these hard material particles partly also exceed the surface 44 that is formed by Ni substrate 39 especially, to such an extent as to have only hard material particle 40 to contact with metallic plate 12.Hard material particle 40 evenly is distributed in the matrix 39 in heterogeneity.
Because working roll 8 bears great mechanical load, in preferred design, diamond layer 42 is set in addition on basal layer 38, as shown in Figure 3.
Particularly under only having the situation of basal layer 38, working roll 8 will use nano level hard material particle 40, to obtain higher surface quality.For this working roll 8, the share of hard material particle 40 is between 15 to 25 volume percentage points in upper area.Coating based on nickel cobalt (alloy) for example has the nickel of about 63 volume percentage points at this, the composition of the boron carbide particles 40 of the cobalt of 12 volume percentage points and 25 volume percentage points.
By using coating system as shown in Figure 3 can make further significant prolongation of wear life.The thickness D1 of basal layer 38 is between 0.5 to 2mm in lower area in this case.The thickness D2 of diamond layer is approximately 0.5mm simultaneously.
Compare with the hard chrome coating, the wear life of working roll 8 has correspondingly prolonged about 4 to 6 times by basal layer 38 as described herein.By using diamond layer 42 to make wear life prolong several times than it.Integrate by using coating measure as described herein to make and obtained greatly prolongation the service life of working roll 8, thereby produce less operating cost.
Simultaneously, coating allows high draught pressure p, can add the saving that realizes cost by high draught pressure, because can improve mill speed and/or reduce the frame number.

Claims (10)

1. utilize working roll (8) to make the method for sheet material (12) in the milling train (2), working roll (8) is provided with the coating of being made up of ductile metal base material (39) and wherein embedded hard material particle (40) (38), wherein, when rolling, draught pressure (p) is set to greater than 2GPa.
2. the method for claim 1, wherein draught pressure is set to greater than 3GPa, and particularly draught pressure is set to be in the scope between 4 to 6GPa.
3. as claim 1 or 2 described methods, wherein, described basic material (39) is nickel or nickel alloy.
4. method as claimed in claim 3, wherein, the nickel share of described coating (38) approximately is in the scope between 65 volume percentage points to 95 volume percentage point, and is in especially in the scope of about 75 volume percentage points.
5. as claim 3 or 4 described methods, wherein, tungsten and/or iron and/or cobalt partly are set as alloy composition.
6. as each described method in the claim 3 to 5, wherein, the share of the alloy composition part on the described coating (38) approximately is between 10 volume percentage points to 20 volume percentage point.
7. the method according to any one of the preceding claims, wherein, the share of the hard material particle (40) on the described coating (38) is in the scope between 1 volume percentage point to 50 volume percentage point, particularly is between 15 volume percentage points to 30 volume percentage point.
8. the method according to any one of the preceding claims, wherein, hard material particle (40) has the size in the nanometer range.
9. the method according to any one of the preceding claims wherein, is used boron carbide particles, tungsten carbide particle and/or diamond particles as hard material particle (40).
10. the method according to any one of the preceding claims wherein, applies hard layer (42), particularly diamond layer on coating (38).
CN200880020699A 2007-06-20 2008-06-17 Method for producing a sheet metal in a rolling train Pending CN101715373A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE200710028824 DE102007028824B3 (en) 2007-06-20 2007-06-20 Process for producing a sheet in a rolling mill
DE102007028824.9 2007-06-20
PCT/EP2008/057598 WO2008155320A1 (en) 2007-06-20 2008-06-17 Method for producing a sheet metal in a rolling train

Publications (1)

Publication Number Publication Date
CN101715373A true CN101715373A (en) 2010-05-26

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CN200880020699A Pending CN101715373A (en) 2007-06-20 2008-06-17 Method for producing a sheet metal in a rolling train

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EP (1) EP2155410A1 (en)
CN (1) CN101715373A (en)
DE (1) DE102007028824B3 (en)
UA (1) UA91953C2 (en)
WO (1) WO2008155320A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5683082B2 (en) * 2009-07-29 2015-03-11 三菱日立製鉄機械株式会社 Rolling mill with work roll shift function
CN104550585A (en) * 2014-12-15 2015-04-29 贵州安大航空锻造有限责任公司 Rolling forming method of structural steel thick-wall ring forging
CN104550584A (en) * 2014-12-15 2015-04-29 贵州安大航空锻造有限责任公司 Roll forming method for cobalt-based superalloy thick-wall ring forgings

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE710146C (en) * 1939-04-04 1941-09-05 Edelstahlwerke Akt Ges Deutsch Process for the production of rolls with a steel core and a hard metal jacket
BE901055A (en) * 1984-11-14 1985-05-14 Centre Rech Metallurgique Surface treatment of cold rolling cylinder - by coating with hardening component prior to exposing to laser beam treatment
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 (en) * 1995-07-14 1997-04-07 Sandvik Ab Composite wall with cemented carbide and cast iron
DE69917859T2 (en) * 1998-03-24 2005-07-07 Jfe Steel Corp. METHOD FOR PRODUCING NON-DROST COLD-ROLLED HIGH GLOSS STEEL PLATE
DE102005061134A1 (en) * 2005-12-19 2007-06-21 Siemens Ag Component of a steel mill, such as continuous casting plant or rolling mill, method for producing such a component and plant for the production or processing of metallic semi-finished products
DE102006011384B4 (en) * 2006-03-09 2019-09-05 Sms Group Gmbh Roll for metalworking, in particular continuous casting roll

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DE102007028824B3 (en) 2009-02-19
UA91953C2 (en) 2010-09-10
WO2008155320A1 (en) 2008-12-24
EP2155410A1 (en) 2010-02-24

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Application publication date: 20100526