EP3849721A1 - Verfahren zu herstellung eines metallischen gutes - Google Patents
Verfahren zu herstellung eines metallischen gutesInfo
- Publication number
- EP3849721A1 EP3849721A1 EP19780153.3A EP19780153A EP3849721A1 EP 3849721 A1 EP3849721 A1 EP 3849721A1 EP 19780153 A EP19780153 A EP 19780153A EP 3849721 A1 EP3849721 A1 EP 3849721A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roll stand
- thickness
- scale
- nozzles
- row
- 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
- 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
- B21B45/04—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 for de-scaling, e.g. by brushing
- B21B45/08—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 for de-scaling, e.g. by brushing hydraulically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B2038/004—Measuring scale thickness
Definitions
- the invention relates to a method for producing a metallic good, in particular a slab, a preliminary strip, a strip or a sheet, in which the good is first conveyed in the conveying direction by a scale washer and then by a rolling mill, the rolling mill at least one roll stand, in particular has a first roll stand in the conveying direction, the material in the scale washer being acted upon by at least one upper row of nozzles which descaled the top of the goods and by at least one lower row of nozzles which descaled the bottom of the goods.
- the material is usually guided through a number of roll stands in the rolling mill; however, it is also possible to use a single roll stand, especially in the case of a stick egg rolling mill.
- descaling devices are used to operate hot rolling mills. After removing the scale with the help of a high-pressure water jet, another forms immediately when it is transported on Secondary scale layer.
- the growth rate of the scale thickness depends on the plant and process conditions.
- the belt or slab in the area of the scale washer is wetted by water or remains there, on the underside, the applied water falls straight down again.
- different strip temperatures usually occur on the top and bottom when passing through the scale washer line. As a result, these lead to different scale layers.
- EP 1 365 870 B1 already describes how the conditions can be improved by setting a symmetrical temperature distribution from the top to the bottom of the belt in the area of the scale washer and after the scale washer. However, these measures are not sufficient to be able to set optimal conditions for the rolling mill and the strip. The scaling behavior must rather be taken into account and influenced in a targeted manner.
- EP 1 034 857 B1 JP 1 -205810 A, JP 2001 -9520 A and JP 2001 -47122 A.
- the object of the invention is to develop a generic method in such a way that the aforementioned Disadvantages can be reduced. Accordingly, the aim is to improve the product and system properties by optimizing the scale washer or the process of descaling in the same. This should be able to influence the formation of secondary scale in particular.
- the solution to this problem by the invention is characterized in that the method comprises the steps of: a) determining the thickness of a secondary scale layer on the top of the material, which is at the location of the at least one roll stand, in particular at the location of the first rolling stand, or at a defined location in front of the at least one rolling stand, in particular in front of the first rolling stand, and determining the thickness of a secondary scale layer on the underside of the material, which is at the location of the at least one rolling stand, in particular at the location of the first
- Roll stand or at the defined location in front of the at least one roll stand, in particular the first roll stand; b) Determining the distance between the last row of nozzles in the conveying direction and the last row of nozzles in the conveying direction, so that the difference between the thickness of the secondary scale layer on the top of the product and the thickness of the secondary scale layer on the bottom of the product at the above location below a given one Value.
- the determination according to step b) above is preferably carried out in such a way that a defined product mix for the good is considered and an average distance is determined for this.
- the thickness of the upper and lower secondary scale layer can be determined by a measurement at the location of the at least one roll stand, in particular at the location of the first roll stand, or at the defined location in front of the at least one roll stand, in particular in front of the first roll stand (at this defined location it can be one shortly before the first rolling stand, which is selected or determined for determining the thickness of the secondary scale layer).
- the thickness of the upper and lower secondary scale layers can be determined by numerical simulation using a process model.
- the numerical simulation calculates the temperature profile on the top and on the underside of the goods as they pass through the scale washer to the rolling mill.
- the numerical simulation or calculation of the thickness of the upper and lower secondary scale layer comprises determining the thickness using the relationship: with s: thickness of the secondary scale layer
- the aforementioned equation for determining the scale thickness can be used in a simulation model.
- the scale factor mentioned which is dependent on temperature and material, can be determined experimentally or taken from the literature. It can also be determined empirically by appropriate investigations in a professional manner.
- the distance between the last row of upper nozzles in the conveying direction and the last row of lower nozzles in the conveying direction is preferably selected at least 0.2 m, particularly preferably at least 0.3 m.
- the distance between the last row of nozzles in the conveying direction and the at least one roll stand, in particular the first roll stand, is preferably at most 6.0 m, particularly preferably at most 4.0 m.
- the specified value for the difference between the thickness (s 0 ben) of the secondary scale layer on the top of the material and the thickness (s un ten) of the secondary scale layer on the bottom of the material when it enters the at least one roll stand, in particular in the first roll stand, is preferably determined according to the relationship: With. SMeans - (Soben Sunten) / 2
- the temperature of the material in the area between the scale washer and the at least one roll stand, in particular the first roll stand is preferably set such that the temperature (romp) of the goods on the top and the temperature (T un ten) of the goods on the Bottom side when entering the at least one roll stand, in particular the first roll stand, the following applies: With. TlVlittel - (frolic tunts) / 2
- the temperatures are to be used in ° C.
- the material is preferably additionally cooled with water in the area between the scale washer and the at least one roll stand, in particular the first roll stand.
- Different nozzle sizes can be used in the scale washer on the top of the goods and on the underside of the goods.
- a further row of nozzles can be provided in the scale washer for the underside of the goods, which is activated if necessary.
- the proposed concept provides a combination of measures and a definition of boundary conditions, so that instead of symmetrical strip temperatures it is possible to influence the scale formation or scale symmetry in a targeted manner, which enables an improved procedure in the sense of the above task.
- FIG. 1 schematically shows a section of a production line for a metallic strip according to the prior art, the area of a scale washer and a subsequent rolling mill being shown and the temperature profile and the course of the temperature in the direction of conveyance for the top and bottom of the band the formation of secondary scale is shown with a calculated thickness
- Fig. 2 in the representation of Figure 1, the corresponding illustration for a solution according to the invention.
- a strip 1 (or a slab, a preliminary strip or a sheet) is indicated, which is descaled in a scale washer 2 on the top 6 of the strip 1 and on the underside 8 of the strip 1.
- the strip which has been cleaned or descaled in this way is fed in a conveying direction F to a rolling mill 3, where it is rolled.
- the rolling mill 3 has a number of rolling stands 4, of which only one is shown in the figures, namely the first rolling stand F1 of the rolling mill 3.
- the scale washer 2 has an upper row of nozzles 5 and a lower row of nozzles 7, which are provided for the respective cleaning or descaling of the corresponding side of the belt 1.
- a pair of rollers 9 and a pair of rollers 10 are provided to promote the belt.
- the scale washer 2 also has a further upper nozzle row 11 and a further lower nozzle row 12. With the various rows of nozzles, water W is applied to the top and bottom of the belt 1
- FIG. 1 shows an example of a two-row scale washer 2 in front of a rolling mill 3 in the form of a finishing train according to the prior art. It shows how the strip surface temperatures (T 0 / u ) can develop.
- the scale growth between the respective last scale scrubber spray bars 5 and 7 and the finishing train 3 is particularly remarkable. If, as shown in FIG. 1, the two rows of descaling 5 and 7 are arranged one above the other, these boundary conditions form at the same distance from the first roll stand 4 of the rolling mill 3 (F1) and different surface temperatures T 0 / u a different scale layer thickness s 0 / u , which leads to the problems described at the beginning. Especially the differences in
- Tinder layer thickness between the top and bottom are disadvantageous and should be minimized according to the invention or kept within certain limits.
- the upper descaling row 5 and the lower descaling row 7 can be staggered in the conveying direction F in such a way that the lower row 7 is closer to the finishing train 3 or in particular in front of the first mill stand F1. This is represented by the distance a in FIG. 2.
- the scale conditions can be optimized, which is shown below in a specific embodiment.
- the temperature profiles for the top 6 of the band 1 (T 0 ) and for the bottom 8 of the band 1 (T u ) and the important scale growth with the thickness of the scale layer forming on the top 6 of the band 1 (s 0 ) and on the Underside 8 of band 1 (s u ) are shown in FIG. 2 and can be calculated.
- the distance b between a descaling row and the rolling stand F1 and the distance a from the upper to the lower descaling row can be determined in such a way that the scale layer thicknesses are optimal for the subsequent or subsequent roll forming operations. This means that the difference in the scale layer thickness s 0 / u is set so that the difference in the layer thickness on the top and the bottom of the strip on the roll stand is below a predetermined value.
- Rolling mill 3 is designed in such a way that the following optimally defined conditions can be set for the feed speed and surface temperatures, averaged over the product mix, based on the production share:
- the upper and lower scale washer spray bars 5 and 7 are arranged offset from one another (distance a) such that the lower spray bar is arranged last.
- the distance b between the last descaling bar 7 and the roll stand F1 and the distance a between the upper and lower spray bars 5 and 7 are chosen so that the scale thickness when entering the rolling mill (in the example on the stand F1 of the finishing train 3) is on average on the top and bottom of the strip is preferably the same or the difference
- As of the calculated scale layer thicknesses (amount) between the top and bottom sides is less than 15% of the average scale layer thickness (see the area for the distance of the roll stand F1 from the last descaling row 7 in Figure 2).
- the surface temperature curves behind the scale washer 2 with or without additional belt cooling between scale washer 2 and rolling mill 3 should result in the surface surface temperatures such that the temperature difference (amount) between the top and bottom 6 and 8 of the belt 1 is less than 3% of the average surface temperature on Roll stand is.
- the distance a between the upper and lower spray rows 5 and 7 of the scale washer 2 is preferably more than 0.2 m, particularly preferably more than 0.3 m.
- the distance b between the last scale scrubber spray row 7 and the following mill stand F1 is preferably less than or equal to 6 m and particularly preferably less than or equal to 4 m.
- the descaling nozzle for the top of the belt differs from the nozzle on the underside of the belt; larger nozzles are used in particular below than above. In this case, this means that a larger amount of water is applied to the bottom in order to be able to influence the temperatures on the surface of the belt in a desired manner.
- a third row of scale washer nozzles can be provided on the underside of the belt, which is activated by the process model depending on the boundary conditions.
- the first row of descaling nozzles can only be deactivated at the top, only at the bottom or on both sides (this applies to a multi-row scale washer).
- the amount of water and / or the pressure level of the first or / and second row of descaling nozzles (or also on another row of nozzles) on the top and / or bottom can be reduced individually.
- the design of the system in particular the determination of the distances in the area of the scale washer and roll stand, is carried out in the following steps:
- the distance between the last descaling row 7 to the rolling mill, i. H. up to the first mill stand F1 is preferably minimized in order to minimize secondary scale formation.
- the distance (a) between the upper and lower scale washer spray bars is determined so that the conditions or goals of the above scale and / or temperature relationships are met, or the difference in the scale layer thickness between the top - and bottom is minimal.
- variable temperature or scale control elements When operating the existing system with given distances, the variable temperature or scale control elements (nozzle pressures, water quantities) are used so that the above tolerances are observed.
- the surface temperatures in front of and / or behind the (first) mill stand F1 can be measured and compared with the calculated values.
- the difference in torque between the upper and lower drive spindles can also be used to draw indirect conclusions about the roughness difference of the work rolls of the roll stand if a difference persists across several belts or increases during a rolling program.
- This measured value can also be used as feedback for the scale model and the setting of the descaling parameters (water pressure and quantity)
- a process model is preferably provided that not only optimally controls the pressure level or the amount of water in the scale washer and the additional cooling (if available) behind the scale washer, so that the target of equal scale layer thicknesses on the top and bottom can be as close as possible, but can energy consumption (ie minimum water pressure and quantity) and strip temperature losses (minimum water quantity) are also minimized.
- Piston pumps are ideal for varying the pressure level and for saving energy.
- the proposed configuration according to the invention makes it possible to select a position (Pos) for the position of the first roll stand F1, the extent of which is indicated in FIG. 2. This position is within an optimal range (Opt) for the arrangement of the mill stand F1 following the scale washer 2.
- the distances mentioned are advantageously designed according to the rolling portfolio.
- the concept can be adapted so that the descaling rows can be switched on or off as required.
- the pressure level can be set differently for the upper or lower of the respective nozzle rows.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018215492.9A DE102018215492A1 (de) | 2018-09-12 | 2018-09-12 | Verfahren zu Herstellung eines metallischen Gutes |
| PCT/EP2019/074215 WO2020053268A1 (de) | 2018-09-12 | 2019-09-11 | Verfahren zu herstellung eines metallischen gutes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3849721A1 true EP3849721A1 (de) | 2021-07-21 |
| EP3849721B1 EP3849721B1 (de) | 2022-05-11 |
Family
ID=68109275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19780153.3A Active EP3849721B1 (de) | 2018-09-12 | 2019-09-11 | Verfahren zur herstellung eines metallischen gutes |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US11883868B2 (de) |
| EP (1) | EP3849721B1 (de) |
| JP (1) | JP7189330B2 (de) |
| CN (1) | CN112739469B (de) |
| DE (1) | DE102018215492A1 (de) |
| WO (1) | WO2020053268A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117066291A (zh) * | 2023-08-18 | 2023-11-17 | 武汉钢铁有限公司 | 一种快速准确检验除鳞喷嘴状态的方法 |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57142702A (en) * | 1981-02-26 | 1982-09-03 | Nippon Steel Corp | Method and device for hot rolling which suppress formation of secondary scale of steel material |
| JPS61111701A (ja) * | 1984-11-06 | 1986-05-29 | Kawasaki Steel Corp | 熱延鋼帯のスケ−ル抑制方法 |
| JPH01178312A (ja) * | 1987-12-29 | 1989-07-14 | Sumitomo Metal Ind Ltd | 高温圧延材のデスケーリング装置 |
| JPH01205810A (ja) * | 1988-02-12 | 1989-08-18 | Sumitomo Metal Ind Ltd | デスケーリング後のスケール生成防止方法 |
| JPH07115061B2 (ja) * | 1992-08-31 | 1995-12-13 | 株式会社神戸製鋼所 | 鋼板の製造方法 |
| JP3704876B2 (ja) * | 1997-03-31 | 2005-10-12 | 住友金属工業株式会社 | 高温鋼材の水冷却方法 |
| JP3422671B2 (ja) * | 1997-12-05 | 2003-06-30 | 三菱重工業株式会社 | 熱間仕上圧延時のスケール疵生成抑制方法及び装置 |
| JP3401698B2 (ja) | 1998-06-08 | 2003-04-28 | コニカ株式会社 | 写真画像入り記録体及び写真画像入り記録体作製方法 |
| JP2000246325A (ja) * | 1999-02-24 | 2000-09-12 | Mitsubishi Heavy Ind Ltd | 熱間圧延におけるスケール疵防止装置及び防止方法 |
| JP3994582B2 (ja) * | 1999-06-29 | 2007-10-24 | 住友金属工業株式会社 | 鋼板のデスケーリング方法 |
| JP2001047122A (ja) * | 1999-08-12 | 2001-02-20 | Hitachi Ltd | デスケーリング方法及びデスケーリング装置 |
| DE10110324A1 (de) * | 2001-03-03 | 2002-09-05 | Sms Demag Ag | Verfahren zum Entzundern von Bändern |
| KR20040012083A (ko) * | 2002-07-31 | 2004-02-11 | 주식회사 포스코 | 열연강판의 스케일 생성조건에 따른 탈 스케일 방법 |
| JP4800245B2 (ja) * | 2007-03-15 | 2011-10-26 | 新日本製鐵株式会社 | 鋼片のスケール除去装置 |
| DE102012214298B4 (de) * | 2012-08-10 | 2025-02-27 | Sms Group Gmbh | Verfahren zur Reinigung und/oder Entzunderung einer Bramme oder eines Vorbandes mittels eines Zunderwäschers und Zunderwäscher |
| KR101940428B1 (ko) * | 2014-08-26 | 2019-01-18 | 제이에프이 스틸 가부시키가이샤 | 후강판의 제조 설비 및 제조 방법 |
| DE102016217562A1 (de) * | 2016-03-18 | 2017-09-21 | Sms Group Gmbh | Vorrichtung und Verfahren zum Entzundern eines bewegten Werkstücks |
-
2018
- 2018-09-12 DE DE102018215492.9A patent/DE102018215492A1/de not_active Withdrawn
-
2019
- 2019-09-11 US US17/273,443 patent/US11883868B2/en active Active
- 2019-09-11 EP EP19780153.3A patent/EP3849721B1/de active Active
- 2019-09-11 CN CN201980059765.3A patent/CN112739469B/zh active Active
- 2019-09-11 JP JP2021513802A patent/JP7189330B2/ja active Active
- 2019-09-11 WO PCT/EP2019/074215 patent/WO2020053268A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| US20210346928A1 (en) | 2021-11-11 |
| DE102018215492A1 (de) | 2020-03-12 |
| CN112739469B (zh) | 2024-02-02 |
| JP2021536368A (ja) | 2021-12-27 |
| CN112739469A (zh) | 2021-04-30 |
| WO2020053268A1 (de) | 2020-03-19 |
| JP7189330B2 (ja) | 2022-12-13 |
| EP3849721B1 (de) | 2022-05-11 |
| US11883868B2 (en) | 2024-01-30 |
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