EP2718035A1 - Method, computer program and rolling mill train for rolling a metal strip - Google Patents
Method, computer program and rolling mill train for rolling a metal stripInfo
- Publication number
- EP2718035A1 EP2718035A1 EP12725808.5A EP12725808A EP2718035A1 EP 2718035 A1 EP2718035 A1 EP 2718035A1 EP 12725808 A EP12725808 A EP 12725808A EP 2718035 A1 EP2718035 A1 EP 2718035A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolling
- piercing
- thickness
- metal strip
- stand
- 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.)
- Granted
Links
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
-
- 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
- B21B2013/006—Multiple strand rolling mills; Mill stands with multiple caliber 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2273/00—Path parameters
- B21B2273/06—Threading
- B21B2273/08—Threading-in or before threading-in
Definitions
- the invention relates to a method, a computer program and a rolling train for rolling a metal strip.
- the rolling train comprises N in the rolling direction successively arranged active rolling stands.
- the starting point is a four-stand tandem rolling mill 10, which has a pay-out reel 8 and a take-up reel 12 downstream.
- the method shown in Figure 3 for cold rolling a metal strip 200 provides that initially all scaffolds of the tandem mill 10 are driven up, so that first the metal strip is passed with the tape head 210 without thickness reduction through the roll nips of the rolling stands to the take-up reel 12 to be wound there; see Figures 3a and b). With the winding creates a tensile stress in the metal strip between the take-up reel 12 and the unwinding reel 8; see Figure 3c).
- the work rolls of the rolling stands are all first placed on the metal strip 200, see Figure 3d), before rolling on the first stand begins, in which its work rolls are fed to a nip having a predetermined piercing thickness; see FIG. 3e).
- the thickness jump in the metal strip caused in this way by the first roll stand then passes sequentially through all following rolling stands of the tandem mill 10. In this case, a successive start of the rolling takes place on the individual stands, as soon as said thickness jump passes through the respective stand; see Figures 3f and 3g).
- the last rolling mill of the tandem mill is preferably set to the desired target thickness for the metal strip.
- the invention has the object of developing a method, a computer program and a rolling mill for cold rolling a metal strip to the effect that the unwanted65cons be significantly shortened.
- This object is achieved by the method claimed in claim 1.
- This method is characterized in that the piercing thickness of the nth rolling stand of the rolling mill is set to a second predetermined piercing thickness smaller than the first piercing thickness of the nth in accordance with the tensile stress between the nth and the n + 1 'th rolling stand active rolling mill, is further reduced.
- active rolling mills refers to those rolling mills of the rolling mill which contribute to a reduction in the thickness of the metal strip by setting their nip height accordingly.
- Roll mills with an open nip are not included in the active rolling mills in the sense of the invention, but they can easily be used between two active mills within In this case, however, the rolling mills with open nip remain irrelevant to the method according to the invention.
- the order of steps of the method according to the invention is not necessarily strictly adhered to. Thus, the steps a and b as well as the steps d and e can each be interchanged in their order.
- the inventive method whether the setting of the roll nip to a predetermined piercing thickness before the metal strip is transported to the respective rolling stand or after the metal strip or the tape head of the metal strip has already arrived on the input side of the rolling stand. In any case, the setting of the roll gap should be completed, however, if the respective relevant point of the metal strip from which a reduction in thickness is to take place, has come into the nip.
- the parameter n designates the rolling mills of the rolling train arranged one behind the other in the rolling direction.
- the parameter k denotes the number of changes made, in particular reductions, the piercing thickness per roll stand per rolling process.
- the parameter x designates the rolling stands upstream of the rolling stand n.
- the piercing thicknesses are parameterized in the present description in each case with the two parameters k and n.
- the piercing thicknesses are typically functions of the time; ie the changes in piercing thicknesses are time-dependent. Structure of the tensile stress in the present invention means an increase in the tensile stress.
- the advantage of the method according to the invention is that a built-up and recognized modified tensile stress in the metal strip between the nth and n + 1'th roll stand is used to further reduce the piercing thickness on the n'ten active rolling stand.
- the method according to the invention makes it possible in this way, already with the cold rolling of the metal strip, i. begin with the thickness reduction of the metal strip before the tape head reaches the take-up reel and is wound by this to build up tensile stress.
- the structure of the tensile stress is advanced by the inventive method spatially and temporally from the take-up reel on the first active rolling stands. In this way, a very significant reduction of unwanted span jointly filed.
- the method according to claim 1 is particularly advantageously applied not only to two adjacent active rolling stands n and n + 1 of the rolling train, but preferably to all rolling mills or roll stand pairings of the rolling train.
- almost all rolling mills n with n ⁇ n ⁇ N-1 would be set sequentially not only to a first, but also at least to a second, further reduced predetermined piercing thickness.
- the respective settings or changes in the piercing thicknesses of the individual rolling mills just described are precalculated in each case in a control device of the rolling train.
- the calculation and Determining in each case so that in each rolling stand, taking into account the expected tensile stresses and the material properties of the stock metal strip and taking into account the technological limitations, the inlet thickness and the target thickness, the maximum possible thickness reduction for the metal strip is set. This leads to a further optimization of the method according to the invention and thus to a further reduction of the unwanted dimension lengths.
- All piercing thicknesses k with 1 ⁇ k ⁇ K of all rolling mills of the rolling train are preferably matched to one another such that the K'ten predetermined piercing thickness D K, N of the N'th rolling stand is the desired target thickness for the metal strip.
- the method according to the invention preferably already starts at the head of the respective metal strip, likewise in order to reduce the dimension lengths.
- the beginning of the tape in the method according to the invention does not first pass through the open nips of all scaffolds, but already when passing through the tape head through the rolling stands of the rolling mill, piercing of the metal strip is already on the belt head.
- the reduction of the piercing thicknesses in the individual rolling stands is preferably not discontinuous in the sense of a jump function, but continuous, e.g. ramped over time.
- Reducing the piercing thicknesses at the ⁇ + 1 'th rolling stand advantageously begins only when that of one of the preceding Rolled mills generated, for example, wedge-shaped thickness-reduced portion of the metal strip reaches the ⁇ + 1 'te roll stand.
- FIG. 4 shows the boundary conditions of a stitch plan calculation for adjusting the nip of the work rolls in a rolling mill, as known from the prior art.
- the stitch plan calculation takes into account technological boundary conditions, such as the features of the metal strip on the inlet and outlet side, the inlet thickness, the desired target thickness and technological limitations.
- the calculation of the maximum possible piercing thickness takes place with additional consideration of the material of the metal strip to be rolled, the friction between the work rolls and the metal strip and taking into account further framework data.
- the rolling model then calculates the required parameters for setting the work rolls, ie the rolling force, the rolling moment, the roll bending, the displacement, the Outlet thickness and gain factors of the technical regulation and in particular also the said maximum possible piercing thickness.
- the method according to the invention provides in a first method step a) for the nip roll nip to be set to a predetermined first piercing thickness n before the metal strip 200 with the strip head 210 passes the nip roll nip; see Figure 1 a).
- the metal strip 200 is then brought with its tape head 210 further to the n'te mill stand, where it, including its tape head 210 is reduced to the first piercing thickness D 1 n in its thickness; see Figure 1 b).
- the metal strip 200 is then further transported according to FIG. 1 c) from the nth roll stand to the ⁇ + 1 'th roll stand, where it is set by the first piercing thickness D 1 in + 1 with Di , n + i ⁇ D 1 n Working rolls of the ⁇ + 1 'th rolling mill to learn a further reduction in thickness. It then builds a tensile stress in the metal strip between the ⁇ + 1 'and the n'ten roll stand.
- This tensile stress is measured by means of a tension measuring device 50, for example a tension measuring roller.
- the method according to the invention then further provides that then the piercing thickness at the n'th roll stand is further reduced to a second predetermined piercing thickness D 2, n .
- the second piercing thickness of the nth rolling stand is less than its first piercing thickness.
- This reduction of the piercing thickness at the nth roll stand preferably takes place in a ramp over time, resulting in a wedge-shaped decrease in the thickness of the metal strip 200.
- the structure of a tensile stress between the ⁇ + 1 'th and the ⁇ + 2'ten roll stand can be used to perform a second reduction in thickness to a second predetermined piercing thickness D 2, n + i even in the ⁇ + 1' th rolling mill.
- This thickness reduction is also preferably ramped as a function of time.
- the second predetermined piercing thickness D 2, n + i already corresponds to the desired target thickness for the metal strip, see FIG. 1 f).
- the rolling train may have more than two active rolling stands 300.
- the described method according to the invention is preferably to be extended to all rolling mills of the rolling train, ie quasi in the horizontal direction.
- Figure 2 shows how, finally, also the built-up tension between the take-up reel 400 and the last stand of the rolling train, i.
- the N'ten rolling stand can be used to achieve a further reduction in thickness, preferably towards the desired target thickness at the N'ten rolling stand.
- the coiling results in the formation of a tensile stress in the metal strip between the take-up reel 400 and the N'ten stand 300, which is detected by the tension measuring device 50; see Figure 2c).
- This recognized increase in draft between the take-up reel 400 and the nth roll stand can then be used to further reduce the piercing thickness at the stand, preferably to the desired target thickness.
- the last setting of the roll gap on the first roll stand takes place when the reduction of the piercing thickness of the metal strip realized thereby is sufficient to roll the desired target thickness at the exit of the N'th roll stand of the rolling train.
- the method according to the invention also applies to a reversing cold rolling mill. After the first pass through the reversing road then reaches the metal strip then on the frame N is not yet the desired target thickness. The process is then repeated for at least one return and re-runs through the road until the desired target thickness is reached.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011106327 | 2011-06-08 | ||
DE102011078150A DE102011078150A1 (en) | 2011-06-08 | 2011-06-27 | Method, computer program and rolling mill for rolling a metal strip |
PCT/EP2012/060698 WO2012168299A1 (en) | 2011-06-08 | 2012-06-06 | Method, computer program and rolling mill train for rolling a metal strip |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2718035A1 true EP2718035A1 (en) | 2014-04-16 |
EP2718035B1 EP2718035B1 (en) | 2015-08-12 |
Family
ID=47220453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12725808.5A Active EP2718035B1 (en) | 2011-06-08 | 2012-06-06 | Method, computer program and rolling mill train for rolling a metal strip |
Country Status (8)
Country | Link |
---|---|
US (1) | US9364878B2 (en) |
EP (1) | EP2718035B1 (en) |
KR (1) | KR101535450B1 (en) |
CN (1) | CN103717323B (en) |
DE (1) | DE102011078150A1 (en) |
ES (1) | ES2546316T3 (en) |
RU (1) | RU2566132C2 (en) |
WO (1) | WO2012168299A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104148383B (en) * | 2014-06-28 | 2016-01-13 | 济钢集团有限公司 | Compact cold strip mill closes roll gap threading milling method |
CN106794495B (en) * | 2014-10-09 | 2020-04-07 | 日本制铁株式会社 | Method for manufacturing metal plate with convex strip, metal plate with convex strip and structural component |
KR102234362B1 (en) * | 2020-02-26 | 2021-03-31 | 한국생산기술연구원 | Roll-Path design method of shape rolling process |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3762195A (en) * | 1970-03-09 | 1973-10-02 | Hitachi Ltd | Thickness control apparatus for rolling mill |
JPS5832503A (en) * | 1981-08-22 | 1983-02-25 | Sumitomo Metal Ind Ltd | Continuous rolling method by tandem mill |
DE3317635A1 (en) * | 1983-05-14 | 1984-11-15 | Fried. Krupp Gmbh, 4300 Essen | Hot-rolling method |
US4782683A (en) * | 1986-03-03 | 1988-11-08 | Tippins Incorporated | Hot strip mill shape processor and method |
JPS62207508A (en) * | 1986-03-05 | 1987-09-11 | Kobe Steel Ltd | Method for controlling sheet thickness for reverse rolling mill |
US4793169A (en) * | 1986-06-27 | 1988-12-27 | United Engineering, Inc. | Continuous backpass rolling mill |
JPS63188416A (en) * | 1987-02-02 | 1988-08-04 | Kawasaki Steel Corp | Control method for strip thickness and tension between stands in continuous rolling mill |
US4998427A (en) * | 1989-11-29 | 1991-03-12 | Aeg Westinghouse Industrial Automation Corporation | Method for rolling on-gauge head and tail ends of a workpiece |
IT1259487B (en) * | 1992-08-26 | 1996-03-20 | Danieli Off Mecc | PROCESS FOR THE PRODUCTION OF THIN SHEETS AND COMPACT LAMINATION PLANT ADOPTING SUCH PROCEDURE |
US5706690A (en) * | 1995-03-02 | 1998-01-13 | Tippins Incorporated | Twin stand cold reversing mill |
SE507111C2 (en) * | 1995-07-07 | 1998-03-30 | Moelnlycke Ab | Fastening means for interconnecting opposing front and rear side portions of an absorbent article |
DE19605008A1 (en) * | 1996-01-30 | 1997-07-31 | Mannesmann Ag | Process for rolling hot strip, in particular hot wide strip |
JP2000312909A (en) * | 1999-04-27 | 2000-11-14 | Toshiba Corp | Plate width controller |
JP3844280B2 (en) | 2000-10-25 | 2006-11-08 | 新日本製鐵株式会社 | Reduction leveling setting method in sheet rolling |
RU2207205C2 (en) * | 2001-08-29 | 2003-06-27 | Открытое акционерное общество "Новолипецкий металлургический комбинат" | Method for controlling strip thickness |
FR2888763B1 (en) * | 2005-07-22 | 2008-10-03 | Vai Clecim Sa | INSPECTION METHOD AND ASSOCIATED INSTALLATION |
DE102007049062B3 (en) | 2007-10-12 | 2009-03-12 | Siemens Ag | Operating method for introducing a rolling stock into a rolling stand of a rolling mill, control device and rolling mill for rolling a strip-shaped rolling stock |
CN101602068B (en) * | 2009-07-07 | 2011-08-17 | 东北大学 | Control method and control system of tension in the process of rolling periodic variable-thickness strips |
-
2011
- 2011-06-27 DE DE102011078150A patent/DE102011078150A1/en not_active Withdrawn
-
2012
- 2012-06-06 ES ES12725808.5T patent/ES2546316T3/en active Active
- 2012-06-06 RU RU2013158949/02A patent/RU2566132C2/en not_active IP Right Cessation
- 2012-06-06 KR KR1020137034755A patent/KR101535450B1/en active IP Right Grant
- 2012-06-06 US US14/124,396 patent/US9364878B2/en active Active
- 2012-06-06 EP EP12725808.5A patent/EP2718035B1/en active Active
- 2012-06-06 WO PCT/EP2012/060698 patent/WO2012168299A1/en active Application Filing
- 2012-06-06 CN CN201280038637.9A patent/CN103717323B/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2012168299A1 * |
Also Published As
Publication number | Publication date |
---|---|
ES2546316T3 (en) | 2015-09-22 |
KR20140026573A (en) | 2014-03-05 |
RU2013158949A (en) | 2015-07-20 |
DE102011078150A1 (en) | 2012-12-13 |
WO2012168299A1 (en) | 2012-12-13 |
US9364878B2 (en) | 2016-06-14 |
EP2718035B1 (en) | 2015-08-12 |
CN103717323B (en) | 2016-01-27 |
US20140298877A1 (en) | 2014-10-09 |
RU2566132C2 (en) | 2015-10-20 |
CN103717323A (en) | 2014-04-09 |
KR101535450B1 (en) | 2015-07-09 |
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