US20120000263A1 - Method for providing at least one work roll for rolling rolling stock - Google Patents

Method for providing at least one work roll for rolling rolling stock Download PDF

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Publication number
US20120000263A1
US20120000263A1 US13/256,404 US201013256404A US2012000263A1 US 20120000263 A1 US20120000263 A1 US 20120000263A1 US 201013256404 A US201013256404 A US 201013256404A US 2012000263 A1 US2012000263 A1 US 2012000263A1
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United States
Prior art keywords
roll
work
rolling
rolling stock
accordance
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.)
Abandoned
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US13/256,404
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English (en)
Inventor
Ralf Wachsmann
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SMS Group GmbH
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SMS Siemag AG
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Filing date
Publication date
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Assigned to SMS SIEMAG AKTIENGESELLSCHAFT reassignment SMS SIEMAG AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WACHSMANN, RALF
Publication of US20120000263A1 publication Critical patent/US20120000263A1/en
Assigned to SMS GROUP GMBH reassignment SMS GROUP GMBH CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SMS SIEMAG AKTIENGESELLSCHAFT
Abandoned 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
    • 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
    • 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
    • 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
    • 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
    • B21B2263/00—Shape of product
    • B21B2263/02—Profile, e.g. of plate, hot strip, sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2263/00—Shape of product
    • B21B2263/04—Flatness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2263/00—Shape of product
    • B21B2263/04—Flatness
    • B21B2263/06—Edge waves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/02—Roll dimensions
    • 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
    • B21B2269/00—Roll bending or shifting
    • B21B2269/12—Axial shifting the rolls
    • B21B2269/14—Work rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2271/00—Mill stand parameters
    • B21B2271/02—Roll gap, screw-down position, draft position

Definitions

  • the invention concerns a method for preparing at least one work roll for the rolling of preferably strip-shaped rolling stock, wherein the work roll is provided to interact with a second roll, especially an intermediate roll or backup roll, and to be supported by this roll, and wherein the axial end regions of the second roll have a setback.
  • the rolling stock profile is the distribution of the thickness of the rolling stock over its width. Rolling stock profiles that deviates greatly from the parabolic form are generally undesirable, since they can lead to nonflatness in the rolling process or in the downstream processes. In addition, the accuracy to gage of the product can be adversely affected.
  • EP 0 294 544 B1 provides that the work roll is provided with a profile that is described by a polynomial.
  • EP 1 307 302 B1 proposes a similar solution, in which a so-called CVC profile is provided.
  • Other similar and different solutions are disclosed in EP 1 703 999 B1, EP 0 937 515 B1, JP 3032412 A, JP 9253726 A, DE 39 19 285 A1, JP 8332509 A, JP 6015322 A, and JP 2179308A.
  • the profiles applied on the work roll are thus parabolic contours or contours described by polynomials. In the latter case, when an axial work roll shifter is present and shifting is used a profile correcting element, the S-shaped contours described by the aforesaid polynomials are applied to the roll (CVC cut).
  • the application of special contours to reduce edge drop or to reduce ridge formation is also well known.
  • the goal here is to influence the rolling stock profile contour in the immediate edge region in order to compensate effects of work roll flattening in the roll gap or of thermal expansion of the work roll on the roll gap profile.
  • the objective of the invention is to propose a method for preparing a work roll of the type described at the beginning, with which it is possible, even when there is a corresponding setback of the backup roll or intermediate roll, to achieve optimum rolling, i.e., to roll a strip that is characterized by high quality and the desired shape. Accordingly, undesirable nonparabolic effects of the backup roll or intermediate roll setback on the roll gap profile shape are to be largely compensated.
  • the provision of the work rolls with a special cut (e.g., CVC cut) should not be compromised.
  • step (c) computation of a compensation cut for the work roll by subtraction of the rolling stock contour defined according to step (b) from the roll gap profile according to step (a) and multiplication of the computed difference by a damping factor;
  • step (d) at least proportional application of the compensation cut computed according to step (c) to at least one work roll.
  • the compensation cut according to step (c) can be superimposed on another profiling of the work roll.
  • This other profiling of the work roll is preferably a parabolic profiling or an S-shaped profiling (so-called CVC profiling).
  • the damping factor for the computation according to step (c) is preferably 0.3-0.9 and more preferably 0.4-0.8. A value of 0.6 has been found to be especially effective.
  • the factor is chosen in such a way that for the broad strips or products, ridge-shaped profile forms no longer arise or the ridges are greatly reduced, and for narrower dimensions of the strip, no disturbing effects or only slightly disturbing effects arise.
  • step (a) the computation according to step (a) is based on the maximum width provided for the rolling stock that is to be rolled with the work rolls.
  • step (a) is preferably based on a well-defined rolling force and a well-defined work roll bending force.
  • the definition according to step (b) is preferably based on the same parameters as in step (a).
  • the profile that is to be defined in accordance with step (b) is based on a roll gap profile computed offline.
  • the roll gap profile computed offline is based on an extended backup roll barrel, so that the edges of the rolling stock are not located in the region of the setback of the second rolls.
  • the proposed method provides a work roll cut to compensate the bending behavior of the work roll in the region of the backup roll setback.
  • a possibly desired special roll cut e.g., a CVC cut
  • CVC cut is superimposed on the compensation cut provided in accordance with the invention.
  • the compensation cut can be used both on work rolls that can be axially shifted and on work rolls that cannot be shifted.
  • It can be proportionally applied to only one work roll or to the upper and the lower work roll.
  • the compensation cut can be combined with any desired roll cut, i.e., it can be superimposed on it.
  • the height of the cut can be varied according to the current work roll diameter.
  • the height can also be adapted to the current backup roll contour or intermediate roll contour (with respect to wear).
  • the cut can be described, for example, by a sequence of points or by a mathematical function (e.g., by a polynomial function).
  • FIG. 1 is a schematic drawing of the work rolls and backup rolls of a four-high rolling stand during the rolling of strip-shaped rolling stock, viewed in the direction of rolling.
  • FIG. 2 shows the variation of the roll gap, i.e., the height of the roll gap over the width less the height in the center, between two work rolls over the width of the rolling stock during the rolling of the rolling stock without the use of the method of the invention.
  • FIG. 3 shows the variation of the roll gap between two work rolls over the width of the rolling stock as a target contour (ideal profile shape).
  • FIG. 4 shows the variation of the roll gap between the work rolls over the width of the rolling stock as the difference contour between the target contour according to FIG. 3 and the variation according to FIG. 2 .
  • FIG. 5 shows the variation of a compensation cut for the work rolls over the width of the rolling stock.
  • FIG. 6 shows the effect of the compensation cut (supplementary cut) over the width of the rolling stock for different axial shift positions on the unloaded roll gap.
  • FIG. 7 shows the variation of the roll gap between two work rolls over the width of the rolling stock with the use of the compensation cut according to FIG. 5 .
  • FIG. 1 shows two work rolls 1 , 2 , which are part of a four-high rolling stand (which itself is not shown).
  • the work rolls 1 , 2 are supported in a well-known way by backup rolls 4 , 5 .
  • the rolling stock 3 that is to be rolled which in the present case is a strip with a width B of 3,100 mm, is located between the work rolls 1 , 2 .
  • the backup rolls 4 , 5 In their lateral regions, i.e., their axial end regions, the backup rolls 4 , 5 have a setback 6 , i.e., the profile is set back compared to a pure cylinder. In FIG. 1 this is shown with strong exaggeration.
  • the work rolls 1 , 2 are acted upon not only by the support forces of the backup rolls 4 , 5 but also by work roll bending forces F B and the rolling forces themselves, so that the work rolls experience reverse bending, which is indicated by the arrows 7 .
  • the reverse bending of the work rolls in the area of the setback 6 of the backup rolls thus depends on the rolled width of the rolling stock 3 , the rolling force that is applied, and the work roll bending force F B that is set. Therefore, the choice of a frequently rolled large width of the rolling stock and of a mean rolling force that is customary for the last passes of a pass program and a bending force (balancing force) at a low level are advantageous for the cut configuration. In this regard, we can initially proceed from average roll diameters.
  • the roll cambers are chosen in each case in such a way that the computed roll gap profiles fall within the usual range (about 0.000 mm to 0.200 mm).
  • the roll gap profile to be expected is computed for the rolling stand to be considered under the aforesaid boundary conditions for the maximum width to be rolled.
  • An example of the result of such a computation is shown in FIG. 2 .
  • the shape of the roll gap profile for a rolling stock width of 3,100 mm without compensation of the reverse bending effect. It is clearly seen that the profile takes an undesired course in the lateral region of the strip due to the reverse bending of the work rolls.
  • an ideal rolling stock contour is defined for the same case.
  • This can be, for example, a roll gap profile computed offline under the assumption of an extended backup roll barrel, so that the edges of the rolling stock are not located in the area of the setback 6 of the backup rolls.
  • This ideal profile shape is shown in FIG. 3 as an example of a target contour, again for a strip with a width of 3,100 mm.
  • the undesired profile component produced by the reverse bending effect is determined by subtracting the target contour (according to FIG. 3 ) from the roll gap shape without compensation cut (according to FIG. 2 ).
  • FIG. 4 Sketched here is thus the difference contour between the target contour and the roll gap shape without compensation, again for a strip with a width of 3,100 mm.
  • the solid curve is the roll gap shape without compensation cut, while the dot-dash curve indicates the target contour. Accordingly, the broken curve represents the difference contour that is needed to compensate the reverse bending effect.
  • the compensation cut for the work roll is obtained by the difference contour according to FIG. 4 , where the difference that is determined is multiplied by a damping factor K of, e.g., 0.7.
  • K e.g. 0.07
  • This factor is chosen in such a way that in the case of broad strips, ridge-shaped profile forms do not arise, while in the case of narrower dimensions of the strip, no disturbing effects or only slightly disturbing effects arise.
  • the compensation cut for application to both work rolls 1 , 2 is shown in FIG. 5 .
  • the graph shows the radius deviation ( ⁇ r) over the barrel length.
  • the contour should run out harmonically, as is indicated in FIG. 5 with reference number 8 .
  • FIG. 6 The effect of the supplementary cut on the unloaded roll gap is illustrated in FIG. 6 for different axial shift positions.
  • the solid line indicates the curve that is obtained with work rolls 1 , 2 that have not been axially shifted.
  • the broken line shows the curve that is obtained when the upper and lower work rolls are shifted relative to each other by 150 mm.
  • FIG. 6 thus shows the effect on the unloaded roll gap as a function of the axial shift position. It is apparent that even in the case of a relatively large axial shift of the rolls, the desired effect remains largely constant.
  • FIG. 7 shows the resultant roll gap shape obtained with the use of the compensation cut.
  • the improvement that is realized in the profile shape is apparent from a comparison of this contour with the original contour without compensation cut according to FIG. 2 .
US13/256,404 2009-04-17 2010-04-15 Method for providing at least one work roll for rolling rolling stock Abandoned US20120000263A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102009017536.9 2009-04-17
DE102009017536 2009-04-17
PCT/EP2010/002302 WO2010118862A2 (de) 2009-04-17 2010-04-15 Verfahren zum bereitstellen mindestens einer arbeitswalze zum walzen eines walzguts

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US20120000263A1 true US20120000263A1 (en) 2012-01-05

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US13/256,404 Abandoned US20120000263A1 (en) 2009-04-17 2010-04-15 Method for providing at least one work roll for rolling rolling stock

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Country Link
US (1) US20120000263A1 (ko)
EP (1) EP2419226B1 (ko)
JP (1) JP5679994B2 (ko)
KR (1) KR101299955B1 (ko)
CN (1) CN102395434B (ko)
AU (1) AU2010237331B2 (ko)
BR (1) BRPI1014649A2 (ko)
CA (1) CA2743400C (ko)
DE (1) DE102010014867A1 (ko)
EG (1) EG26541A (ko)
MX (1) MX2011005506A (ko)
RU (1) RU2487770C2 (ko)
UA (1) UA100086C2 (ko)
WO (1) WO2010118862A2 (ko)
ZA (1) ZA201102662B (ko)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN106734218A (zh) * 2016-12-30 2017-05-31 中铝西南铝冷连轧板带有限公司 一种解决四辊冷轧机轧辊辊端压靠的方法
US20180200769A1 (en) * 2015-07-28 2018-07-19 Primetals Technologies Austria GmbH Roll crown for the specific avoidance of quarter waves
CN114700368A (zh) * 2022-03-07 2022-07-05 北京科技大学 一种消除板带局部高点的工作辊辊形及设计方法

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JP6034188B2 (ja) * 2009-06-26 2016-11-30 ライサンド アクツィエンゲゼルシャフト 抗微生物剤
DE102010063828A1 (de) * 2010-12-22 2012-06-28 Sms Siemag Ag Stützwalze und Walzenanordnung
DE102016222987A1 (de) * 2016-11-22 2018-05-24 Sms Group Gmbh Verfahren zum Schleifen der Kontur des Ballens einer Walze
CN106553089B (zh) * 2016-11-24 2018-08-31 南京钢铁股份有限公司 一种使用普通外圆磨床加工带有弧形凹度轧辊的加工方法

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US20040040358A1 (en) * 2001-01-23 2004-03-04 Jurgen Seidel Roll stand for producing plane roll strips having a desired strip profile superelevation
US20070240475A1 (en) * 2003-12-23 2007-10-18 Kneppe Guenter Method and Roll Stand for Multiply Influencing Profiles
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180200769A1 (en) * 2015-07-28 2018-07-19 Primetals Technologies Austria GmbH Roll crown for the specific avoidance of quarter waves
US10589328B2 (en) * 2015-07-28 2020-03-17 Primetals Technologies Austria GmbH Roll crown for the specific avoidance of quarter waves
CN106734218A (zh) * 2016-12-30 2017-05-31 中铝西南铝冷连轧板带有限公司 一种解决四辊冷轧机轧辊辊端压靠的方法
CN114700368A (zh) * 2022-03-07 2022-07-05 北京科技大学 一种消除板带局部高点的工作辊辊形及设计方法

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RU2487770C2 (ru) 2013-07-20
EP2419226B1 (de) 2014-02-26
RU2011127006A (ru) 2013-05-27
ZA201102662B (en) 2011-12-28
BRPI1014649A2 (pt) 2016-04-12
KR101299955B1 (ko) 2013-08-26
EP2419226A2 (de) 2012-02-22
UA100086C2 (ru) 2012-11-12
KR20110066216A (ko) 2011-06-16
WO2010118862A2 (de) 2010-10-21
MX2011005506A (es) 2011-06-16
CN102395434B (zh) 2014-03-26
EG26541A (en) 2014-02-09
DE102010014867A1 (de) 2010-11-18
JP5679994B2 (ja) 2015-03-04
CN102395434A (zh) 2012-03-28
AU2010237331B2 (en) 2013-05-23
CA2743400A1 (en) 2010-10-21
AU2010237331A1 (en) 2010-10-21
JP2012516777A (ja) 2012-07-26
WO2010118862A9 (de) 2011-01-27
WO2010118862A3 (de) 2010-12-09
CA2743400C (en) 2013-02-26

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