EP2480350A2 - Walzverfahren mit optimierter strain penetration - Google Patents
Walzverfahren mit optimierter strain penetrationInfo
- Publication number
- EP2480350A2 EP2480350A2 EP10760296A EP10760296A EP2480350A2 EP 2480350 A2 EP2480350 A2 EP 2480350A2 EP 10760296 A EP10760296 A EP 10760296A EP 10760296 A EP10760296 A EP 10760296A EP 2480350 A2 EP2480350 A2 EP 2480350A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolling
- thickness
- stock
- passes
- rolled
- 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
- 238000005096 rolling process Methods 0.000 title claims abstract description 249
- 238000000034 method Methods 0.000 title claims description 9
- 230000035515 penetration Effects 0.000 title description 6
- 238000011017 operating method Methods 0.000 claims description 21
- 238000004590 computer program Methods 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 abstract description 9
- 230000002123 temporal effect Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000930 thermomechanical effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
-
- 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
- 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
- B21B1/30—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 in a non-continuous process
- B21B1/32—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 in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/22—Pass schedule
Definitions
- the present invention relates to an operating method for a rolling mill for rolling a flat rolled stock from an initial thickness to a final thickness
- a number of rolling passes is determined and the rolling stock is rolled according to the determined rolling passes.
- the present invention further relates to a computer program comprising machine code which is directly executable by a controller for a rolling mill for rolling flat and whose processing by the controller causes the controller to control the rolling mill according to such an operating method.
- the present invention further relates to a control device for a rolling mill for a rolling flat, which is designed such that it controls the rolling mill in operation according to such an operating method.
- the present invention relates to a rolling mill for a flat rolling controlled by such a control device.
- thermomechanical rolling of heavy plate an attempt is made to set the finest possible fine-grained structure in order to optimize the mechanical properties of the end product.
- the rule of thumb is that the finer the grain, the better the mechanical properties.
- the principle of thermomechanical rolling is the coarse grain, which forms in the heating of the rolled plate to be rolled or rolling at high temperatures, to destroy by forming to the intermediate thickness and to prevent grain growth by lowering the temperature.
- it is particularly important to completely penetrate the material (strain penetration) in order to influence the microstructure in the material core as well. The most effective way to do this is by making as much as possible transformations per stitch. If it is not possible to work in all passes with maximum forming, preferably the stitches should be maximized before the cooling pauses and in the low temperature rolling phases.
- the object of the present invention is to provide ways by which a good strain penetration can be achieved in a simple and reliable manner.
- an operating method of the type mentioned initially such that prior to rolling of the rolling stock on the basis of technological constraints an allowable thickness range is set, within which the intermediate thickness is to lie, and that the determination of the rolling passes such that the intermediate thickness within the permissible thickness range is and
- the performance limits of the rolling mill are not fully utilized, but in the event that the number of rolling passes were reduced by one, the intermediate thickness would be outside the allowable thickness range, although for all of the one reduced number of millimeters Walzstichen the performance limits of the rolling mill would be fully utilized.
- a window is created for the intermediate thickness. This makes it possible in most cases to perform all rolling passes before the rolling break with maximum forming. The necessary without this thickness window reduction of deformation can be omitted.
- the thickness window (in the terminology of the present invention: the permissible thickness range) must not be confused with the unavoidable manufacturing tolerance. Because the manufacturing tolerance is a (relatively small) error that can not be avoided due to manufacturing reasons. For example, a material thickness of 70 mm should be set. However, despite all accuracy, the material thickness varies, for example, between 69.5 mm and 70.5 mm. By contrast, given the permissible thickness range, it is specified that, for example, the intermediate thickness should be within a range which is considerably greater than production-related tolerances.
- the intermediate thickness should be between 65 mm and 75 mm.
- the production-related tolerance is not taken into account here.
- the permissible thickness range is not an area within which the actual actual intermediate thickness of the rolling stock lies, but an allowable nominal thickness range within which the desired intermediate thickness of the rolling stock lies.
- a target thickness is given, which should be approached if possible.
- the target thickness in this case is within the permissible thickness range or, conversely, the permissible thickness range is defined around the target thickness.
- the number of rolling passes is preferably determined such that a difference of the resulting intermediate thickness from the target thickness is minimized.
- the intermediate thickness is preferably at the lower limit of the permissible thickness range. Because in this case is it is possible to reduce the utilization of the performance limits of the rolling mill as little as necessary.
- the rolling passes not fully exploiting the performance limits of the rolling mill are the last of the rolling passes. It can thereby be achieved that in the event of unforeseen disturbances of the rolling operation, a reserve (if only a small one) remains.
- the rolling stock is rolled longitudinally from the initial thickness to the intermediate thickness and, during the rolling, is at least partially transversely rolled from the intermediate thickness to the final thickness.
- the permissible thickness range is determined by the corresponding permissible longitudinal or transverse region of the rolling stock, within which the corresponding dimension of the rolling stock after the rolls should be at the final thickness.
- the rolling stock it is possible for the rolling stock to be rolled lengthwise from the initial thickness to the intermediate thickness as well as during rolling from the intermediate thickness to the final thickness.
- the permissible thickness range is usually determined by the technological possibilities of the rolling mill to roll the rolling stock after the rolling break to the final thickness.
- the rolling from the initial thickness to the intermediate thickness is usually carried out in a first temperature range. During the rolling break, the rolling stock cools down. The rolling from the intermediate thickness to the final thickness is subsequently carried out in at least a second, lower temperature range. In some cases, rolling takes place from the intermediate thickness to the final thickness in more than a second temperature range. In this case, in each case between two immediately adjacent second temperature ranges, a further rolling break, in which the rolling stock cools. The rolling processes taking place in each case in one of the second temperature ranges can also be designed according to the invention.
- the intermediate thickness of the respective preceding rolling operation corresponds in this case to the initial thickness of the respective rolling operation.
- the object is further achieved by a computer program of the type mentioned, whose machine code is designed such that its processing by the control device causes the control device controls the rolling mill according to an operating method according to the invention.
- the computer program can in particular be stored on a data carrier in machine-readable form (in particular in an exclusively machine-readable form, for example electronically).
- control device for a rolling mill for a flat rolling stock which is designed such that it controls the rolling mill in operation according to an operating method according to the invention.
- a rolling mill has at least one rolling stand 1. 1 and 2, a single rolling mill 1. It is possible, however, that more than one roll stand 1 is present.
- flat rolling stock serves to distinguish between profiled rolling stock, rod-shaped rolling stock and tubular rolling stock.
- the rolling mill is designed as a reversing mill, in which the flat rolling material 2 is reversibly rolled.
- This embodiment is the normal case of the present invention.
- the rolling mill has a control device 3, by which it is controlled.
- the control device 3 is designed such that, during operation, it controls the rolling mill in accordance with an operating method which will be explained in detail below.
- the control device 3 can be programmed with a computer program 4 having machine code 5, which can be processed directly by the control device 3.
- the processing of the machine code 5 by the control device 3 causes in this case that the control device 3 controls the rolling mill according to the operating method according to the invention.
- the computer program 4 can be supplied to the control device 3 in various ways. In particular, it is possible that the computer program 4 is stored on a data carrier 6 in machine-readable form. As an example of one Data carrier 6 is shown in FIG 1, a USB stick. However, this embodiment is purely exemplary.
- the computer program 4 can also be supplied to the control device 3 in a different way than via the data carrier 6. For example, it is possible to supply the computer program 4 to the control device 3 via a computer-computer connection, in particular a local area network or the world wide web.
- the flat rolled stock 2 is to be rolled in the rolling mill from an initial thickness dA to a final thickness dE.
- the control device 3 carries out a method which will be explained in more detail below in conjunction with FIG.
- the control device 3 counteracts performance limits of the rolling mill in a step S1.
- the control device 3 for each rolling stand 1 of the rolling mill its maximum possible rolling force, its maximum possible rolling torque, its maximum possible return force, etc. take.
- control device 3 counteracts the (actual) initial thickness dA, the (desired) final thickness dE and the technological boundary conditions of the rolling stock 2 and the rolling process.
- the variables could also be determined otherwise.
- the decisive factor is that they are known to the control device 3.
- a step S3 the control device 3 determines a number of rolling passes, so that the rolling stock 2 is rolled from the initial thickness dA to an intermediate thickness dZ.
- These rolling passes are referred to below as linguistic distinction from other rolling passes as basic stitches.
- the choice of words is only for language distinction. A broad meaning content should not be associated with this choice of words.
- the control device 3 determines further stitches as part of the step S3, so that the rolling stock 2 is rolled from the intermediate thickness dZ to the final thickness dE.
- These rolling passes are referred to below the linguistic distinction of the base stitches as additional stitches. This choice of words also serves only the linguistic distinction.
- step S4 the control device 3 controls the rolling mill in accordance with the rolling passes determined in step S3, that is to say in accordance with the base passes and possibly also the additional passes.
- the base stitches are performed in a first temporal rolling section 7, the additional stitches in at least one further temporal rolling section 8.
- Both the basic stitches and the additional stitches are indicated in Figure 4 as vertical lines.
- a rolling break 9 is an arbitrarily inserted rolling break 9.
- the rolling break 9 is not merely the unavoidable break between two directly successive rolling passes, which is required, for example, for reversing the rolling stock 2. If a plurality of further rolling sections 8 are present, in each case a further rolling break 9 'is located between adjacent further rolling sections 8.
- the rolling takes place in the first temporal rolling section 7 at a first temperature of the rolling stock 2, which is relatively high. From rolling section 7 to rolling section 8 (and possibly also from rolling section 8 to rolling section 8), the rolling stock 2 cools in the respective rolling recess 9, 9 '.
- a permissible thickness range DB is set in a step Sil, within which the intermediate thickness dZ should lie.
- the thickness range DB is defined by an upper limit ze dZmax and a lower limit dZmin defined.
- the thickness range DB is not just a tolerance range that is unavoidable in the operation of the rolling mill. Rather, it is an area whose size is significantly greater than the accuracy with which the rolling stock 2 can be rolled to a certain thickness.
- the difference between upper limit dZmax and lower limit dZmin, based on the lower limit dZmin can be between 5 percent and 25 percent.
- Examples of possible thickness ranges DB are shown in FIGS. 6 and 7.
- a number of provisional rolling passes are determined, that is, preliminary base passes.
- the preliminary base stitches are thus set as "limit passes", which cause the maximum possible deformation, so the basic stitches are set according to the motto "Roll stand, do what you can”.
- the number of final base stitches according to a step S14 is equal to the number of preliminary basic stitches in which the permissible thickness range DB is undercut for the first time (in the illustration according to FIG. 7, therefore, five basic stitches).
- the final base stitches can not correspond 1: 1 to the preliminary base stitches. Rather, it is necessary to fully exploit the performance limits of the rolling mill in at least one of the final base stitches. This is illustrated in FIG. 5 in a step S15.
- the exploitation of the performance limits of the rolling mill is preferably only reduced to such an extent that the intermediate thickness dZ, as shown in FIG. 7, lies at the lower limit dZmin of the permissible thickness range DB.
- the intermediate thickness dZ can correspond directly to the lower limit dZmin or, based on the total permissible thickness range DB, be at least in the lower third, preferably far below, for example in the lower 5 percent or the lower 10 percent of the permissible thickness range DB.
- the intermediate thicknesses dZ achieved according to FIGS. 4, 5 and 6 basic stitches can all lie within the permissible thickness range DB.
- the number of base stitches alternatively 4, 5 or 6.
- a target thickness dZ * that is within the permissible thickness range DB will be specified.
- the number of base stitches is preferably determined such that a difference of the resulting intermediate thickness dZ from the target thickness dZ * is minimized. For example, as shown in FIG. 8, five basic stitches would be executed.
- the rolling stock 2 is usually rolled longitudinally, that is, it is not rotated between the base stitches. In the rolling break 9, however, it is possible that the rolling stock 2 is rotated by 90 ° as shown in FIG 2 and then rolled transversely. Alternatively, it is possible that the rolling stock 2 is not rotated in the rolling break 9, so that it is also rolled longitudinally during the additional stitches. For that reason, because both possibilities Given the turning of the rolling stock 2 by 90 ° in FIG 2 only indicated by dashed lines.
- the permissible thickness range DB corresponds to a corresponding length range LB, within which a length 1 of the rolling stock 2 must be after the rolling of the rolled stock 2 to the final thickness dE.
- the control device 3 initially determines the permissible longitudinal region LB within the scope of determining the permissible thickness range DB and then calculates back to the permissible thickness region DB.
- the permissible thickness range DB corresponds to a permissible transverse range QB in which a width b of the rolling stock 2 after rolling must be at the final thickness dE. In an analogous manner, it is therefore also possible to calculate back to the permissible thickness range DB on the basis of the permissible transverse range QB.
- the rolling stock 2 is always rolled longitudinally, that is to say both during rolling from the initial thickness dA to the intermediate thickness dZ and during rolling from the intermediate thickness dZ to the final thickness dE, it may be possible, as shown in FIG Options of the rolling mill, the rolling stock 2 after the rolling break 9 on the
- the allowable thickness range DB is determined by just these limits.
- the present invention has many advantages. In particular, it is computationally easy to implement, works efficiently and is reliable. There is no danger of overloading the rolling mill or having to carry out, as it were, so-called "small burrs", in which the rolling stock 2 is formed only to a minor extent.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Metal Rolling (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10760296.3A EP2480350B1 (de) | 2009-09-24 | 2010-09-21 | Walzverfahren mit optimierter strain penetration |
PL10760296T PL2480350T3 (pl) | 2009-09-24 | 2010-09-21 | Sposób walcowania ze zoptymalizowanym strain penetration |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09171252A EP2301684A1 (de) | 2009-09-24 | 2009-09-24 | Walzverfahren mit optimierter strain penetration |
EP10760296.3A EP2480350B1 (de) | 2009-09-24 | 2010-09-21 | Walzverfahren mit optimierter strain penetration |
PCT/EP2010/063915 WO2011036156A2 (de) | 2009-09-24 | 2010-09-21 | Walzverfahren mit optimierter strain penetration |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2480350A2 true EP2480350A2 (de) | 2012-08-01 |
EP2480350B1 EP2480350B1 (de) | 2014-04-30 |
Family
ID=42035960
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09171252A Withdrawn EP2301684A1 (de) | 2009-09-24 | 2009-09-24 | Walzverfahren mit optimierter strain penetration |
EP10760296.3A Active EP2480350B1 (de) | 2009-09-24 | 2010-09-21 | Walzverfahren mit optimierter strain penetration |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09171252A Withdrawn EP2301684A1 (de) | 2009-09-24 | 2009-09-24 | Walzverfahren mit optimierter strain penetration |
Country Status (7)
Country | Link |
---|---|
US (1) | US9073107B2 (de) |
EP (2) | EP2301684A1 (de) |
CN (1) | CN102510778B (de) |
BR (1) | BR112012007429A8 (de) |
PL (1) | PL2480350T3 (de) |
RU (1) | RU2012116248A (de) |
WO (1) | WO2011036156A2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2301684A1 (de) | 2009-09-24 | 2011-03-30 | Siemens Aktiengesellschaft | Walzverfahren mit optimierter strain penetration |
EP2737963B1 (de) * | 2012-10-03 | 2016-05-18 | Nippon Steel & Sumitomo Metal Corporation | Verzerrungsberechnungsverfahren und walzanlage |
CN103028603B (zh) * | 2012-11-29 | 2014-11-26 | 一重集团大连设计研究院有限公司 | 一种带钢热连轧的可轧范围优化方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2749754B2 (ja) * | 1993-03-15 | 1998-05-13 | 古河電気工業株式会社 | 可逆式圧延機の圧延スケジュール設定方法 |
JP2998550B2 (ja) * | 1994-02-25 | 2000-01-11 | 日本鋼管株式会社 | 可逆式圧延機のパス・スケジュール決定方法 |
DE19531538A1 (de) | 1995-08-25 | 1997-02-27 | Schloemann Siemag Ag | Warmbandproduktionsanlage für ferritisches Walzen und Verfahren zur Erzeugung von ferritischem Walzband |
DE19540978A1 (de) | 1995-11-03 | 1997-05-07 | Schloemann Siemag Ag | Produktionsanlage zum kontinuierlichen- oder diskontinuierlichen Auswalzen von Warmband |
PT954392E (pt) * | 1996-12-19 | 2004-12-31 | Corus Staal Bv | Processo para producao de tira de aco ou chapa |
JP2001071009A (ja) | 1999-09-03 | 2001-03-21 | Hitachi Ltd | 可逆式圧延方法及び可逆式圧延設備 |
EP2301684A1 (de) | 2009-09-24 | 2011-03-30 | Siemens Aktiengesellschaft | Walzverfahren mit optimierter strain penetration |
-
2009
- 2009-09-24 EP EP09171252A patent/EP2301684A1/de not_active Withdrawn
-
2010
- 2010-09-21 RU RU2012116248/02A patent/RU2012116248A/ru not_active Application Discontinuation
- 2010-09-21 BR BR112012007429A patent/BR112012007429A8/pt not_active IP Right Cessation
- 2010-09-21 CN CN201080042615.0A patent/CN102510778B/zh active Active
- 2010-09-21 EP EP10760296.3A patent/EP2480350B1/de active Active
- 2010-09-21 PL PL10760296T patent/PL2480350T3/pl unknown
- 2010-09-21 WO PCT/EP2010/063915 patent/WO2011036156A2/de active Application Filing
- 2010-09-21 US US13/498,187 patent/US9073107B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2011036156A2 * |
Also Published As
Publication number | Publication date |
---|---|
BR112012007429A8 (pt) | 2017-12-05 |
RU2012116248A (ru) | 2013-10-27 |
CN102510778A (zh) | 2012-06-20 |
PL2480350T3 (pl) | 2014-09-30 |
WO2011036156A2 (de) | 2011-03-31 |
EP2301684A1 (de) | 2011-03-30 |
CN102510778B (zh) | 2014-10-22 |
BR112012007429A2 (pt) | 2016-12-13 |
EP2480350B1 (de) | 2014-04-30 |
US9073107B2 (en) | 2015-07-07 |
US20120180540A1 (en) | 2012-07-19 |
WO2011036156A3 (de) | 2011-11-24 |
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