EP4032627A1 - Dispositif et procédé de laminage à froid, en particulier de dressage, d'un produit laminé en forme de bande - Google Patents

Dispositif et procédé de laminage à froid, en particulier de dressage, d'un produit laminé en forme de bande Download PDF

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Publication number
EP4032627A1
EP4032627A1 EP22152251.9A EP22152251A EP4032627A1 EP 4032627 A1 EP4032627 A1 EP 4032627A1 EP 22152251 A EP22152251 A EP 22152251A EP 4032627 A1 EP4032627 A1 EP 4032627A1
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EP
European Patent Office
Prior art keywords
friction
rolled product
work rolls
increasing
rolling
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
EP22152251.9A
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German (de)
English (en)
Inventor
Thorsten MÜLLER
Thomas Schulz
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 Group GmbH
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 SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP4032627A1 publication Critical patent/EP4032627A1/fr
Pending 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
    • 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
    • B21B1/227—Surface roughening or texturing
    • 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
    • B21B45/002—Increasing friction between work and working rolls by using friction increasing substance
    • 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
    • B21B2001/228—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 skin pass rolling or temper rolling

Definitions

  • the invention relates to a device and a method for rolling a strip-shaped rolled product, preferably in a skin-pass mill, cold-rolling mill or continuous annealing plant with an integrated skin-pass mill.
  • the rolled product enters the nip at a lower speed than the peripheral speed of the work rolls, assumes the same speed at the so-called neutral point in the nip and exits the nip at a higher speed.
  • a lubricant for example a rolling oil or a rolling emulsion
  • the friction caused by the lubricant must not be reduced to such an extent that "slipping" occurs between the rolled product and the work rolls or the transfer of the surface structure of the work rolls to the rolled product is impaired.
  • the skin-pass degree control involves an increase in the rolling force and an increasing skin-pass degree.
  • a conventional rolling oil is, for example, from the DE 37 34 090 A1 out.
  • the texture characteristics applied to the rolled product by temper rolling not only influence its optical properties, but also its mechanical and technological properties, for example the roughness parameters and forming properties (deep-drawing and/or stretch forming properties).
  • Skin-pass rolling usually takes place following a previous hot and/or cold forming with a sufficiently high degree of forming and subsequent annealing.
  • the transfer of the surface structure of the work rolls to the rolled product is influenced by a large number of parameters, such as thickness, width, surface hardness and material strength of the rolled product, initial roughness of the rolled product, roughness of the work rolls, specific/absolute rolling forces and specific/absolute strip tension, skin-passing speed, Tempering temperature, work roll diameter and quantity and composition of the wet tempering agent.
  • the desired surface properties cannot be achieved, or can only be achieved with difficulty, for certain rolled products.
  • a homogeneous transfer of the texture characteristics in a multi-roll skin-pass mill is hardly possible or only possible with extreme adaptation of the rolling conditions.
  • the maximum rolling force that can be achieved is not sufficient to ensure a sufficiently good texture transfer between the work roll and the rolling stock.
  • Increasing the degree of skin pass for example to achieve a better surface appearance, can result in a deterioration in the mechanical-technological properties of the steel.
  • One object of the invention is to improve the rolling, in particular temper rolling, of a strip-shaped rolled product.
  • an improvement in the topography transfer between the work roll and the rolled product is particularly preferably sought.
  • the device and the method are used for rolling, in particular re-rolling, a strip-shaped rolled product, preferably in a skin-pass mill, cold-roll mill or continuous annealing plant (with or without hot-dip device) with an integrated skin-pass mill.
  • Strips made of steel or a non-ferrous metal can be used here, with the temper rolling concept presented here being particularly suitable for skin-pass rolling steel strips, for example for the production of steel strips for the automotive industry, automotive supplier industry and steel service centers, as well as household appliance manufacturers.
  • the device comprises at least one roll stand with two work rolls (DUO skin-passing system), which form a roll gap in which the rolled product, which can be transported in one conveying direction, can be formed.
  • the strip-shaped rolled product is transported through the roll gap along a conveying direction, and the work rolls exert a rolling force on the rolled product in the roll gap, as a result of which the desired deformation takes place.
  • the roll stand preferably further comprises two back-up rolls (QUARTO skin pass mill) respectively in contact with the work rolls to support the work rolls and to avoid or at least limit deflection of the work rolls under load.
  • the roll stand is designed, for example, as a duo skin-pass mill or a four-high skin-pass mill. More advanced multi-roll skin-pass mills, such as a six-high with two work rolls, two intermediate rolls, and two back-up rolls, can also be used.
  • the device has a friction value increasing device, which comprises: a provision of friction agent, set up to provide a friction-increasing agent in fluid form, and a friction agent application, which is in fluid communication with the provision of friction agent and is set up to apply the friction-enhancing agent to at least one surface of the work rolls and/or or apply to the rolled product.
  • the friction value increasing device is designed and arranged in this way to increase the coefficient of friction between the work rolls and the rolled product in the roll gap (relative to the case without the use of such a multifunctional fluid, i.e. the friction-increasing agent, or relative to the use of a lubricant such as rolling oil).
  • a friction-increasing agent is applied to one or both work rolls or their rolling surface(s) and/or to one or both surfaces of the rolled product that come into contact with the work rolls in the nip, thereby increasing the coefficient of friction in the nip becomes.
  • This results in an increase in the rolling force.
  • One or both work rolls are preferably textured, so that the texture of the negative can be transferred to the rolled product by rolling.
  • texture used interchangeably in relation to the surface finish of the work roll(s) and the rolled product formed therewith, and they indicate that the corresponding surfaces are not smooth but fine Have structure, as is usual in temper rolling.
  • the use of the friction-increasing agent means that the work roll topography can be better transferred to the rolled product.
  • an increase in the degree of skin pass can be avoided, which results in an improvement in the mechanical properties.
  • the quantitative difference between undressed and tempered material in terms of forming properties is the attainment of a yield point instead of a yield point and a minimization of the hardening exponent.
  • the strip topography is made more uniform and quality costs are reduced as a result.
  • rolling force control the rolling force is kept constant, with the degree of skin-pass being set as a function of various process parameters over the length of the rolled product.
  • a constant degree of skin-passing is aimed for in skin-pass degree control, whereby the rolling force is controlled accordingly depending on various process parameters over the length of the rolled product and can therefore fluctuate.
  • the use of the friction-increasing agent also has the positive effect that the correspondingly increased rolling force is subject to fewer fluctuations.
  • the application of the friction agent is set up to apply the friction-increasing agent on the inlet side with respect to the roll gap on the at least to apply to a surface of the work rolls and/or the rolled product.
  • the friction-increasing agent is preferably applied before, ie upstream of the roll gap in the conveying direction, whereby the effect is maximized.
  • the application of the friction agent comprises one or more nozzles which are set up to spray the friction-increasing agent onto the at least one surface of the work rolls and/or the rolled product.
  • the friction-increasing agent can be applied in a compact and targeted manner in terms of mechanical engineering.
  • the nozzles are directed towards one or both work rolls in such a way that the friction-increasing agent mostly or substantially completely reaches the corresponding surface(s) of the work roll(s).
  • the work rolls are also cleaned.
  • the friction-increasing agent is used more efficiently compared to direct spraying of the rolled product, since there are fewer losses due to lateral runoff and the like.
  • the friction agent application comprises one or more nozzle bars extending in the width direction of the rolled product and carrying the nozzles.
  • several nozzles can be supplied together with the friction-increasing agent and can cover the areas to be treated in the width direction, i.e. in the main direction of extension of the roll gap.
  • the device further comprises an anti-crimp device with one or more anti-crimp rolls, which are set up to lift the rolled product relative to the nip.
  • the anti-crimp device can also be used to set the desired tape tension or contribute to this purpose.
  • the anti-crimping device is preferably installed both on the strip inlet side and on the strip outlet side with respect to the roll gap.
  • the device preferably also has one or more drive rollers, which are set up to transport the rolled product in the conveying direction and, if necessary, to build up the desired strip tension together with the anti-crimping device.
  • the rolled product preferably runs in a zigzag or S-shape around the drive rollers.
  • drive rollers are preferably installed not only on the upstream side but also on the downstream side, for example four drive rollers on each side.
  • An emulsion or suspension is preferably considered as the friction-increasing agent.
  • the emulsion or suspension preferably comprises a liquid main component, for example water or a rolling oil with deionized water (DI water), and friction-increasing particles, such as micro- or nanoparticles with a diameter of, for example, 0.1 ⁇ m to 10 ⁇ m.
  • DI water deionized water
  • friction-increasing particles such as micro- or nanoparticles with a diameter of, for example, 0.1 ⁇ m to 10 ⁇ m.
  • the above-mentioned object is also achieved by a method for rolling a strip-shaped rolled product, in particular in a skin-pass mill, cold rolling mill or continuous annealing plant (with/without hot-dip device) with an integrated skin-pass mill, the method having: conveying the rolled product through a roll gap formed by two work rolls of a roll stand, along a conveying direction, whereby the rolled product is deformed; and applying a friction-increasing agent in fluid form to at least one surface of the work rolls and/or the rolled product to increase the coefficient of friction between the work rolls and the rolled product in the roll gap.
  • the skin-pass degree is preferably set directly via a skin-pass degree control and preferably indirectly via an increase in the coefficient of friction by means of the friction-increasing agent.
  • the specific rolling force is reduced by larger work roll diameters, under the boundary condition of the same temper roll roughness parameters.
  • a reduction in the specific rolling force can thus be supported by increasing the work roll diameter, with work roll diameters of more than 650 mm, preferably 700 mm or more being feasible. Work roll diameters over 715 mm are particularly suitable.
  • the increase in rolling force is preferably supported by increasing the process speed during skin-passing, for example by means of a loop storage level control in front of the rolling stand.
  • Suitable process speeds are 100 m/min or more, preferably 120 m/min or more, 130 m/min or more, up to about 180 m/min.
  • Steel grades that particularly benefit from the increase in friction are: special deep-drawing grades (DX54D, DX55D, DC04, DC05, CR3); special deep-drawing grades (DX56D, DC06, CR4); Super deep drawing grades (DX57D, DC07, CR5) and ultra deep-drawing grades (DX58D, DC08, CR6 (not yet standardized)) as well as extreme forming grades (DX59D, DC09, CR6 (not yet standardized)).
  • special deep-drawing grades DX54D, DX55D, DC04, DC05, CR3
  • special deep-drawing grades DX56D, DC06, CR4
  • Super deep drawing grades DX57D, DC07, CR5
  • ultra deep-drawing grades DX58D, DC08, CR6 (not yet standardized)
  • extreme forming grades DX59D, DC09, CR6 (not yet standardized)
  • the figure 1 is a schematic view of a device 1 for rolling a strip-shaped rolled product B that can be transported in a conveying direction F.
  • the device 1 comprises a roll stand 10 which is designed as a four-high stand (four-high skin-pass mill), in particular for rolling a cold strip and for use in a skin-pass mill.
  • the device 1 can also have a different structure and/or be designed for a different application.
  • the roll stand 10 of the present exemplary embodiment has two parallel, opposite work rolls 11 which form a roll gap S, and two associated back-up rolls 12 which are in contact with the work rolls 11, respectively, in order to support the work rolls 11 and prevent a deflection of the work rolls 11 to be avoided or at least limited under load.
  • the work rolls 11 are preferably structured, ie their rolling surfaces include a texture which (more precisely, its negative) is transferred to the rolled product B by rolling.
  • Such skin-pass rolling in which the rolled product experiences only a small amount of elongation, can have various functions. In this way, any imperfections in the strip, which may have arisen during an annealing process or during re-rolling, can be eliminated.
  • Skin-pass rolling can change the mechanical properties of the rolled product B, for example improving the formability (deep-drawing and/or stretch-drawing properties) of the product.
  • Through temper rolling In addition, the desired roughness and surface structure of the rolled product B can be set by using correspondingly structured work rolls 11.
  • the device 1 can also have an anti-crimp device 20 with one or more anti-crimp rollers 21, which are set up to lift the rolled product B relative to the roll gap S, thereby reducing the risk of so-called flow and distortion of the desired surface structure to be applied by the work rolls 11.
  • the anti-crimping device 20 can also be set up to set the desired strip tension or contribute to this purpose.
  • an anti-crimping device 20 is only shown on the strip inlet side; however, such an anti-crimp device 20 is preferably also installed on the strip outlet side, ie behind the roll stand 10 .
  • the device 1 usually comprises a plurality of drive rollers 31 which are set up to transport the rolled product B in the conveying direction F and, if necessary, to build up the desired strip tension together with the anti-crimping device 20 .
  • the rolled product B runs around the drive rollers 31 in a zigzag or S-shape figure 1 only two drive rollers 31 are shown, further drive rollers and/or deflection rollers can be installed.
  • drive rollers 31 are preferably installed not only on the tape inlet side but also on the tape outlet side, although for the sake of clarity in FIG figure 1 Not shown.
  • the device 1 has a friction value increasing device 40 which is set up to increase the coefficient of friction between the work rolls 11 and the rolled product B in the roll gap S.
  • the friction value increasing device 40 includes a friction agent supply 41 which provides a friction-increasing agent 42 in fluid form, also referred to herein as "multifunctional fluid".
  • the friction agent provision 41 is in the figure 1 drawn in schematically.
  • the provision of friction agent 41 can include a tank or reservoir and/or a mixer for mixing the agent or the like in order to make the friction-increasing agent 42 available.
  • the friction value increasing device 40 also includes a friction agent application 43, which is in fluid communication with the friction agent supply 41, for example via suitable piping, and is set up to apply the friction-increasing agent 42 to the work rolls 11 and/or to the surfaces of the rolled product B to be rolled.
  • the friction-increasing agent 42 is preferably sprayed onto the surfaces to be wetted, but the friction-increasing agent 42 can in principle also be applied and optionally distributed in a different way, for example by dipping.
  • the friction agent application 43 comprises one or preferably several nozzles 43a which are set up to spray the friction-increasing agent 42 onto the work rolls 11 and/or onto the surfaces of the rolled product B to be rolled.
  • the nozzles 43a are directed towards the work rolls 11 so that the friction-increasing agent 42 reaches the surfaces of the work rolls 11 largely or essentially completely.
  • the friction-increasing agent 42 is used more efficiently compared to direct spraying of the rolled product B, since there are fewer losses due to lateral runoff and the like.
  • the nozzles 43a can be installed in respective nozzle bars 43b extending in the width direction of the rolled product B, ie perpendicular to the plane of the drawing figure 1 , extend.
  • the figure 2 shows the basic dependency of the rolling force as a function of the coefficient of friction for different degrees of deformation. This results in an increase in the rolling forces with an increase in the coefficient of friction in the roll gap S.
  • An increase in the rolling force is sought in particular when skin-passing the rolled product B with degrees of deformation of, for example, 0.3 to 1.5%.
  • the rolled product surfaces must have a specific Have topography and meet defined roughness parameters. This topography is finally applied in a skin pass.
  • soft material yield point/elongation limit ⁇ 220 MPa
  • a homogeneous transfer in a multi-roll skin-pass mill is hardly possible or only possible with extreme adaptation of the rolling conditions.
  • the controllability can be improved, particularly in the case of soft steel grades, for better roughness transfer of the work roll topography to the rolled product surfaces.
  • the topography transfer between the work roll 11 and the rolled product B an increase in the degree of skin pass can be avoided, whereby an improvement in the mechanical properties of the rolled product B is realized.
  • the strip topography is made more uniform and quality costs are reduced as a result. The better controllability of the rolling force simplifies the handling and control of the strip tension in the skin-passing process.
  • Steel grades that particularly benefit from the increase in friction are: special deep-drawing grades (DX54D, DX55D, DC04, DC05, CR3); special deep-drawing grades (DX56D, DC06, CR4); Super deep drawing grades (DX57D, DC07, CR5) and ultra deep drawing grades (DX58D, DC08, CR6 (not yet standardized) as well as extreme deep drawing grades (DX59D, DC09, CR7 (not yet standardized)).
  • special deep-drawing grades DX54D, DX55D, DC04, DC05, CR3
  • special deep-drawing grades DX56D, DC06, CR4
  • Super deep drawing grades DX57D, DC07, CR5
  • ultra deep drawing grades DX58D, DC08, CR6 (not yet standardized)
  • extreme deep drawing grades DX59D, DC09, CR7 (not yet standardized)
  • the figure 3 shows an example of the influence of the temper roll diameter on the specific rolling force. This shows that the specific rolling force is reduced by larger work roll diameters, under the boundary condition of the same skin-pass roughness parameters. A reduction in the specific rolling force can thus be supported by increasing the work roll diameter, with work roll diameters of more than 650 mm, preferably 700 mm or more being feasible. Work roll diameters over 715 mm are particularly suitable.
  • the figure 4 shows schematically the influence of viscosity on the coefficient of friction. It is evident from this that the coefficient of friction can be increased by using the multifunctional fluid compared to the prior art.
  • the interplay of skin-pass roll diameter and fluid viscosity can be used and varied to optimize the rolling result.
  • the level of skin pass is controlled with a suitable friction-increasing agent 42 .
  • the skin-pass degree usually remains constant at the initial level before the rolling force increase due to the multifunctional fluid, which causes less strain hardening of the steel strip, and this in turn leads to a smaller increase in yield strength and thus to a smaller deterioration in forming (by reducing the total strain and the hardening exponent) while ensuring the desired roughness parameters, such as Ra, RPc and Wsa.
  • the multifunctional agent e.g. a water-soluble rolling oil/skin-passing oil with aqueous inhibitors, nanoparticles
  • a water-soluble rolling oil/skin-passing oil with aqueous inhibitors, nanoparticles simultaneously cleans the strip surface and the work rolls 11, its composition and use prevent resinification and sticking of the surfaces involved and ensure any subsequent phosphating and painting of the metallic surfaces, preferably without further surface pretreatments.
  • a corresponding lubricity, a self-drying effect for a dry surface appearance and a highly effective protection against corrosion are realized.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
EP22152251.9A 2021-01-21 2022-01-19 Dispositif et procédé de laminage à froid, en particulier de dressage, d'un produit laminé en forme de bande Pending EP4032627A1 (fr)

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DE102021200535 2021-01-21

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EP4032627A1 true EP4032627A1 (fr) 2022-07-27

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EP22152251.9A Pending EP4032627A1 (fr) 2021-01-21 2022-01-19 Dispositif et procédé de laminage à froid, en particulier de dressage, d'un produit laminé en forme de bande

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3106811A1 (de) * 1981-02-24 1982-09-02 Klöckner-Werke AG, 4100 Duisburg Anlage zum kontinuierlichen behandeln von feinblech
JPS6186004A (ja) * 1984-10-05 1986-05-01 Nippon Steel Corp ステンレス鋼板のスキンパス圧延方法
DE3734090A1 (de) 1986-10-13 1988-04-14 Nippon Kokan Kk Wasserloesliches walzoel fuer das dressierwalzen und verfahren zum dressierwalzen unter verwendung eines solchen walzoels
JPH06122002A (ja) * 1992-02-25 1994-05-06 Kawasaki Steel Corp 熱間圧延方法
EP3698895A1 (fr) * 2019-02-20 2020-08-26 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Installation et procédé de texturisation de la surface d'une bande métallique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3106811A1 (de) * 1981-02-24 1982-09-02 Klöckner-Werke AG, 4100 Duisburg Anlage zum kontinuierlichen behandeln von feinblech
JPS6186004A (ja) * 1984-10-05 1986-05-01 Nippon Steel Corp ステンレス鋼板のスキンパス圧延方法
DE3734090A1 (de) 1986-10-13 1988-04-14 Nippon Kokan Kk Wasserloesliches walzoel fuer das dressierwalzen und verfahren zum dressierwalzen unter verwendung eines solchen walzoels
JPH06122002A (ja) * 1992-02-25 1994-05-06 Kawasaki Steel Corp 熱間圧延方法
EP3698895A1 (fr) * 2019-02-20 2020-08-26 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Installation et procédé de texturisation de la surface d'une bande métallique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
WEBER F: "AKTUELLE ENTWICKLUNGEN BEI DER KALTWALZERZEUGUNG", STAHL UND EISEN,, vol. 110, no. 3, 14 March 1990 (1990-03-14), pages 45 - 51, 173, XP000135337, ISSN: 0340-4803 *
ZIMNIK W ET AL: "MODERNISIERUNG DE HORIZONTAL-FEUERVERZINKUNGSANLAGE BEI DER PREUSSAG STAHL AG", STAHL UND EISEN,, vol. 118, no. 6, 16 June 1998 (1998-06-16), pages 55 - 61, 147, XP000769954, ISSN: 0340-4803 *

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