EP3917694B1 - Verändern der effektiven kontur einer lauffläche einer arbeitswalze während des warmwalzens eines walzguts in einem walzgerüst zu einem gewalzten band - Google Patents

Verändern der effektiven kontur einer lauffläche einer arbeitswalze während des warmwalzens eines walzguts in einem walzgerüst zu einem gewalzten band Download PDF

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Publication number
EP3917694B1
EP3917694B1 EP20700385.6A EP20700385A EP3917694B1 EP 3917694 B1 EP3917694 B1 EP 3917694B1 EP 20700385 A EP20700385 A EP 20700385A EP 3917694 B1 EP3917694 B1 EP 3917694B1
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EP
European Patent Office
Prior art keywords
working roller
running surface
working
wear
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.)
Active
Application number
EP20700385.6A
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German (de)
English (en)
French (fr)
Other versions
EP3917694A1 (de
EP3917694C0 (de
Inventor
Johannes Dagner
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.)
Primetals Technologies Germany GmbH
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Primetals Technologies Germany 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
Priority claimed from EP19153870.1A external-priority patent/EP3685930B1/de
Application filed by Primetals Technologies Germany GmbH filed Critical Primetals Technologies Germany GmbH
Publication of EP3917694A1 publication Critical patent/EP3917694A1/de
Application granted granted Critical
Publication of EP3917694B1 publication Critical patent/EP3917694B1/de
Publication of EP3917694C0 publication Critical patent/EP3917694C0/de
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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
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/142—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
    • 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
    • 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
    • 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
    • B21B2001/225—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 by hot-rolling
    • 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
    • B21B2027/022—Rolls having tapered ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/18—Roll crown; roll profile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/18—Roll crown; roll profile
    • B21B2267/20—Ground camber or profile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/24—Roll wear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2269/00—Roll bending or shifting
    • B21B2269/12—Axial shifting the rolls
    • B21B2269/14—Work rolls

Definitions

  • the present invention relates to the technical field of rolling mill technology. Specifically, the invention relates to the hot rolling of a rolling stock made of a metallic material, in particular steel or aluminum, into a rolled strip in a roll stand.
  • the upper and lower work rolls of a roll stand each have a conical section, an inward running surface and a cylindrical shoulder.
  • the upper work roll is installed in the roll stand in the reverse direction to the lower work roll.
  • a strip edge of the rolled strip always rests on the edge between the conical section and the running surface. This measure can extend the service life of the work rolls to 150 km and more during a rolling campaign without changing or regrinding the work rolls.
  • the document does not disclose how the effective contour of the running surface of a work roll can be changed during the hot rolling of the rolling stock in a roll stand to form a rolled strip.
  • the object of the invention is to specify a method and a device for changing the effective contour of a running surface of a work roll during the hot rolling of a rolling stock in a roll stand between two work rolls to form a rolled strip.
  • the contour of the work roll during operation is generally different from the initial contour of the work roll, i.e. the contour that the work roll has before hot rolling begins.
  • the effective contour of a running surface of a work roll should be understood to mean the contour that the running surface of a work roll (not axially displaced during hot rolling) would have to have so that a specific profile or a specific flatness is achieved in the rolled strip during hot rolling of a rolled product.
  • the contour of the tread is flattened or leveled. In other words, this makes the effective contour flatter.
  • the so-called “ strip crown” eg C 0 , C 25 , C 40 can be reduced.
  • the roll stand and the work rolls of the roll stand are, for example, according to 1 the WO 2017/215595 educated. In the case of the present invention, however, it is not absolutely necessary for the running surfaces of the work rolls to run inwards.
  • the rolled stock is hot-rolled in the roll gap between the upper and lower work rolls of the mill stand, the work rolls being worn by contact with the rolled stock.
  • the radius of the running surfaces increases by ⁇ r due to the wear of the work rolls away.
  • the work rolls are each shifted in opposite axial directions, for example the upper work roll to the right and the lower work roll to the left.
  • the axial displacement speed v, ie the first time derivative of the displacement path s, of the work roll to a value v ⁇ s ⁇ > ⁇ r . tan a to be set.
  • ⁇ r indicates the wear rate of the running surface of a work roll in the radial direction.
  • the so-called “strip crown”, eg C 0 , C 25 , C 40 can be increased.
  • the roll stand or can the work rolls of the roll stand for example, according to 1 WO 2017/215595 be trained.
  • a respective work roll by a displacement 0 ⁇ s ⁇ ⁇ r tan a delay.
  • the effective contour of the work rolls is increased or this contour is made steeper, as a result of which the profile or flatness of the rolled strip is specifically influenced.
  • the belt becomes slightly thinner in the area of the belt edges, which has a direct and immediate effect on the profile or flatness of the belt.
  • ⁇ r indicates the wear of the running surface of a work roll in the radial direction and ⁇ the gradient angle of the conical section of the respective work roll.
  • the axial displacement speed v, ie the first time derivative of the displacement path s, of the work roll to a value 0 ⁇ v ⁇ s ⁇ ⁇ ⁇ r . tan a to be set.
  • ⁇ r indicates the wear rate of the running surface of a work roll in the radial direction.
  • claims 1 and 2 cover opposite objectives as compared to claims 3 and 4. According to claims 1 and 2, the effective contour of a tread of a work roll is reduced, whereas according to claims 3 and 4 the effective contour of a tread of a work roll is increased.
  • the method according to the invention primarily affects the flatness and to a lesser extent the profile of the strip. This is due to the fact that the so-called cross flow is low in very thin strips.
  • the method according to the invention is used for strips with a thickness of >2 mm, it is above all the profile that is influenced and the flatness of the strip to a lesser extent.
  • the object according to the invention is also achieved by a device according to claim 7 for changing an effective contour of a running surface of a work roll during the hot rolling of a rolling stock in a roll stand to form a rolled strip.
  • the device according to the invention is suitable both for reducing and for increasing an effective contour of a running surface of a work roll during the hot rolling of a rolling stock between the two work rolls in a roll stand.
  • an effective contour of a running surface of a work roll during the hot rolling of a rolling stock between the two work rolls in a roll stand.
  • the wear of the running surface in the radial direction is determined by the device for determining the radial wear or the rate of wear ⁇ r of the running surface of the work rolls.
  • the determination can be made either by measurement, or preferably with the aid of a wear model, which takes into account, for example, the rolling force F, the distance s circumference covered by the work roll and/or the rolling time.
  • ⁇ indicates the angle for the revolutions covered by the work roll in radians.
  • the device for determining the wear ⁇ r or the rate of wear ⁇ r of the running surface is connected to a thickness measuring device for measuring the thickness of the rolled strip and a device for determining the distance between the upper and lower work rolls.
  • the wear or the rate of wear can be determined from the typically vertical distance between the work rolls and the measured thickness of the strip.
  • the device for determining the wear ⁇ r or the rate of wear ⁇ r of the running surface has a wear model (see EP 2 548 665 B1 ), wherein the wear model is connected to at least one of the group of a rolling force measuring device for determining the rolling force F, the distance covered by the work roll s circumference and a clock for determining the rolling time.
  • the device according to claim 7 also has a measuring device for determining the profile and/or the flatness of the rolled strip, the measuring device being arranged downstream of the roll stand in the mass flow direction.
  • the control device for the axial displacement of the work rolls in opposite directions depending on the wear or the rate of wear of the work rolls also takes into account the measured profile PRIact and/or the measured flatness PLIact of the rolled strip.
  • the control device is signal-connected to the device for determining the wear or the rate of wear and the measuring device for determining the profile and/or the flatness of the rolled strip.
  • the displacement device itself can, for example, be an electromechanical (e.g. a ball screw with an electric motor) or a hydraulic drive.
  • the initial contour of a running surface is a parabolic contour with a depth of 100 to 300 ⁇ m, the central area is thinner than an edge area of the parabolic contour.
  • the figure 1 shows schematically a roll stand 2 as part of a device for changing the effective contour of a running surface 8 of a work roll 3,4 during hot rolling of a rolling stock in a roll stand 2 to form a rolled strip 1.
  • the rolling stock is hot-rolled in the roll gap between the upper work roll 3 and the lower work roll 4 .
  • Each work roll 3, 4 has two ends 5, each of which is displaceably installed in a chock 6 in a roll stand of the roll stand 2, not shown.
  • each work roll 3, 4 comprises a conical section 7 and a running surface 8 (see also figure 6 ).
  • the upper work roll 3 is installed in the roll stand 2 in the reverse direction to the lower work roll 4 .
  • the upper and lower work rolls 3, 4 can be displaced in the axial direction during operation via separate displacement devices 9.
  • the upper work roll 3 is shifted to the right during operation; the lower work roll 4, however, to the left (see arrows of the displacement path s).
  • the roll gap between the upper and lower work rolls 3, 4 can be adjusted by adjusting devices 16.
  • the upper work roll has a device for determining the wear 11 or the device according to the invention has a wear model. A single device 11 or a single wear model is sufficient if the work rolls 3, 4 are made of the same material.
  • the upper and the lower work roll 3, 4 each have a separate device for determining the wear 11 or a separate wear model. This can be useful if the work rolls 3, 4 during hot rolling with different speeds are operated. In this document, however, it should be assumed that the work rolls 3, 4 consist of the same material and are operated at the same speed.
  • the measurement of the wear ⁇ r or the rate of wear ⁇ r of the running surface 8 of the work rolls 3, 4 in the radial direction can be contacted, eg by a roller which touches the running surface 8, or contactless, eg optically. Since the axial displacement of the work rolls in the roll stand to compensate for wear from the WO 2017/215595 A1 is known, details are included by reference to this document. However, it is not known from this document how the effective contour can be changed in a targeted manner during the rolling of a strip.
  • back-up rolls are not shown for reasons of clarity. It is known to anyone skilled in the field of rolling mill technology that back-up rolls are common and counteract deflection of the work rolls.
  • FIG 2 is a device for changing the effective contour of a running surface of a work roll during the hot rolling of a rolling stock in a roll stand 2 of a five-stand finishing train, for example in a combined casting and rolling plant, is shown schematically.
  • the rolling stock not shown, is fed via a roller table 17 to the finishing train with the roll stands 2a to 2e and is finish-rolled there in the hot state.
  • the wear ⁇ r or the wear rate ⁇ r of the running surfaces 8 of the work rolls 3, 4 is measured by the device 11 (see figure 1 ).
  • the device also includes a measuring device 12 for determining the profile or flatness of the rolled strip.
  • This measuring device is arranged after the roll stand 2 in the mass flow direction.
  • the actual profile PR actual is supplied to a control device 13 .
  • the control device 13 is also supplied with the setpoint profile PR setpoint .
  • the control device 13 calculates the displacement path s or the displacement speed s for the upper and lower work rolls 3, 4 ( please refer figure 1 ).
  • the faster or slower axial displacement of the work rolls 3, 4 allows the effective contour of the work rolls to be changed in a targeted manner. In the case of very thin strips, this mainly affects the flatness of the strip; in contrast, changing the effective contour for thicker strips primarily affects the profile of the rolled strip.
  • the rolled strip is cooled in a cooling section 18 and then conveyed out, for example by being wound up.
  • a strip 1 is hot-rolled in the roll gap between the upper work roll 3 and the lower work roll 4 .
  • the strip has an initial thickness.
  • Both work rolls 3, 4 each have two ends 5, a conical section 7 and a running surface 8.
  • the upper work roll 3 is installed in the reverse direction to the lower work roll 4.
  • the running surfaces 8 of the work rolls 3, 4 are worn in the radial direction by an amount ⁇ r (see Figure 3b ). If the vertical distance between the two work rolls 3, 4 is kept constant, the rolled strip 1 thereby becomes thicker by about 2 ⁇ r. By continuing the hot rolling, the running surfaces 8 of the work rolls 3, 4 are worn by the amount 2. ⁇ r (see Figure 3c ) so that the band becomes thicker by about 4 ⁇ r.
  • this method results in the distance between the contour of the band 1 between the two edges and the contour of the band 1 at the edges decreasing over time. In other words, the effective contour of the work rolls 3, 4 becomes flatter or the effective contour of the work rolls 3, 4 is reduced.
  • this method results in the distance between the contour of the band 1 between the two edges and the contour of the band 1 at the edges increasing over time. In other words, the effective contour of the work rolls 3, 4 becomes steeper or the effective contour of the work rolls 3, 4 is increased.
  • the figure 6 shows the geometric definition of the pitch angle ⁇ of the conical section 7 of a work roll 3, 4.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
EP20700385.6A 2019-01-28 2020-01-13 Verändern der effektiven kontur einer lauffläche einer arbeitswalze während des warmwalzens eines walzguts in einem walzgerüst zu einem gewalzten band Active EP3917694B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP19153870.1A EP3685930B1 (de) 2019-01-28 2019-01-28 Lokales verändern des walzspalts im bereich der bandkanten eines gewalzten bands
EP19219974 2019-12-30
PCT/EP2020/050684 WO2020156787A1 (de) 2019-01-28 2020-01-13 Verändern der effektiven kontur einer lauffläche einer arbeitswalze während des warmwalzens eines walzguts in einem walzgerüst zu einem gewalzten band

Publications (3)

Publication Number Publication Date
EP3917694A1 EP3917694A1 (de) 2021-12-08
EP3917694B1 true EP3917694B1 (de) 2023-08-09
EP3917694C0 EP3917694C0 (de) 2023-08-09

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EP20700385.6A Active EP3917694B1 (de) 2019-01-28 2020-01-13 Verändern der effektiven kontur einer lauffläche einer arbeitswalze während des warmwalzens eines walzguts in einem walzgerüst zu einem gewalzten band

Country Status (5)

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US (2) US11919059B2 (es)
EP (1) EP3917694B1 (es)
CN (1) CN113316491B (es)
ES (1) ES2954881T3 (es)
WO (1) WO2020156787A1 (es)

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CN114260315A (zh) * 2021-12-24 2022-04-01 重庆钢铁股份有限公司 棒线材热轧线上粗中轧无孔型轧辊使用方法
CN115591948B (zh) * 2022-10-13 2024-05-14 福建鼎盛钢铁有限公司 一种提高esp带钢断面尺寸控制精度的方法

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Title
MASAYOSHI SATO, KUCHI MASAHIRO: "Profile and Flatness Set Up System for Rolling Mi", IHI ENGINEERING REVIEW, vol. 42, no. 1, 1 February 2009 (2009-02-01), pages 26 - 31, XP093190348
VERLAG STAHLEISEN GMBH: "Advanced automation system for Dragon Steel's new hot strip mill", METALLURGICAL PLANT AND TECHNOLOGY - MPT INTERNATIONAL, 1 January 2013 (2013-01-01), pages 52 - 55, XP093190346, Retrieved from the Internet <URL:https://www.tmeic.com/Repository/Others/MPT_Dragon_Steel_New_HSM_Article.pdf>
VLADIMIR B. GINZBURG: "High-qualitiy steel rolling", January 1993, MARCEL DEKKER, New York

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US20220126337A1 (en) 2022-04-28
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US11919059B2 (en) 2024-03-05
WO2020156787A1 (de) 2020-08-06
ES2954881T3 (es) 2023-11-27
EP3917694C0 (de) 2023-08-09
US20240173759A1 (en) 2024-05-30

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