WO2019181832A1 - 金属帯の冷間圧延方法 - Google Patents
金属帯の冷間圧延方法 Download PDFInfo
- Publication number
- WO2019181832A1 WO2019181832A1 PCT/JP2019/011103 JP2019011103W WO2019181832A1 WO 2019181832 A1 WO2019181832 A1 WO 2019181832A1 JP 2019011103 W JP2019011103 W JP 2019011103W WO 2019181832 A1 WO2019181832 A1 WO 2019181832A1
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- Prior art keywords
- roll
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- metal strip
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Classifications
-
- 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
- B21B1/24—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 continuous or semi-continuous process
- B21B1/28—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 continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
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- 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
- B21B28/00—Maintaining rolls or rolling equipment in effective condition
- B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
- B21B28/04—Maintaining rolls in effective condition, e.g. reconditioning while in use, e.g. polishing or grinding while the rolls are in their stands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
- B21B2203/18—Rolls or rollers
Definitions
- the present invention relates to a method for cold rolling a metal strip, and specifically to a method for cold rolling a metal strip having excellent surface properties.
- a rolling mill used for cold rolling of a metal strip (metal strip) such as a steel plate various types of rolling mills have been put into practical use.
- a quadruple (4Hi) rolling mill having a pair of upper and lower backup rolls to be corrected, a six-fold (6Hi) rolling mill having a pair of upper and lower intermediate rolls disposed between the upper and lower work rolls and the backup roll, etc. Is common.
- a portion where the metal strip as the material to be rolled comes into contact (generally “sheet path”)
- sheet path a portion where the metal strip as the material to be rolled comes into contact
- the surface of the work roll where the width end of the metal band comes into contact is abnormally worn, and a pattern or step called a “plate path mark” is formed on the roll surface.
- the plate path mark generated on the surface of the work roll is transferred to the surface of the rolled metal band, and surface defects are removed. cause.
- the work roll is directly related to the surface quality of the product, it is exchanged in a short period of time, and the exchange is relatively easy, so the influence on the product quality is relatively small.
- the plate path mark generated on the surface of the work roll is also transferred to the backup roll.
- the backup roll is generally used continuously for a long period of time, and its replacement is not easy and requires a long line stop. Therefore, there is a great need for a technology for preventing the plate path mark even in the backup roll.
- the plate path mark can be generated in all cold rolling mills (rolling stands) including temper rolling if the multi-stage (multiple) rolling mill is used.
- Patent Document 1 discloses a nozzle for injecting emulsion rolling oil to a backup roll in a cold tandem rolling mill having a circulating oil supply mechanism for emulsion rolling oil.
- a method for grinding the steel has been proposed.
- Patent Document 2 proposes a backup roll grinder for cold rolling, in which a rolling roll is rotated in a state where it is incorporated in a rolling mill, and a rotating grindstone is pressed against the rotating roll to grind the roll surface online.
- Patent Document 3 is provided with an online roll grinder that moves in the width direction of the material to be rolled and grinds the work roll with respect to the upper and lower work rolls. A method of moving the grinder point-symmetrically with respect to the center of gravity of the material to be rolled has been proposed.
- the present invention has been made in view of the above-described problems of the prior art, and its purpose is not to attach special equipment to the rolling mill, and also causes a decrease in productivity and an increase in manufacturing cost. Therefore, it is intended to propose a method for rolling a metal strip that can effectively prevent the occurrence of a plate path mark.
- a 6Hi or higher rolling mill having at least one pair of work rolls, one pair of intermediate rolls and one pair of backup rolls and having a shift function capable of moving the intermediate rolls in the roll axis direction is used.
- the intermediate roll is automatically reciprocated in the roll axis direction, which not only significantly reduces the transfer of the plate path mark to the backup roll, but also the board path transferred to the backup roll.
- the inventors have found that marks can also be ground and have developed the present invention.
- the present invention based on the above knowledge is a method of cold rolling a metal strip using a rolling mill provided with at least a pair of upper and lower work rolls, a pair of upper and lower intermediate rolls and a pair of upper and lower backup rolls.
- a method of cold rolling a metal strip is proposed, which rolls the metal strip while reciprocating the roll in the roll axis direction.
- the method of cold rolling a metal strip according to the present invention is characterized in that the position of the roll end of the intermediate roll is reciprocated within a range of 30 mm inward and 80 mm outward from the width end of the metal strip.
- the cold rolling method of the metal strip of the present invention is characterized in that the reciprocating stroke of the intermediate roll is within a range of 5 to 60 mm.
- the metal strip cold rolling method of the present invention is characterized in that the moving speed of the reciprocating movement of the intermediate roll is 0.5 to 4.0 mm / sec.
- the metal strip cold rolling method of the present invention is characterized in that the pair of intermediate rolls are reciprocated in opposite directions.
- the transfer of the plate path mark from the work roll to the backup roll can be greatly reduced by automatically reciprocating the intermediate roll in the roll axis direction during rolling of the metal strip.
- the effect of grinding the plate path mark transferred to the backup roll can be obtained. Therefore, according to the present invention, a metal strip product with good surface quality is always produced without requiring any special incidental equipment in the rolling mill and without causing an adverse effect on productivity due to the stop of the long rolling line. Can be obtained.
- the present invention prevents the transfer of the plate path mark to the backup roll by reciprocating the intermediate roll in the roll axis direction, and reduces the plate path mark that has already occurred by grinding the backup roll surface.
- This is a technology that removes them. Therefore, the cold rolling mill used by the present invention for rolling a metal strip has at least a pair of upper and lower work rolls, an upper and lower pair of intermediate rolls and an upper and lower pair of backup rolls, and the intermediate rolls It is necessary to be a 6Hi or more multiple rolling mill having a shift function that can be moved in the roll axis direction.
- the rolling mill may be a single rolling mill consisting of a single stand or a tandem rolling mill consisting of a plurality of stands.
- the cold rolling method of the metal strip of the present invention is such that the roll end of the intermediate roll is 30 mm from the width end of the metal strip to the inside (plate width central direction side) and 80 mm to the outside (opposite side on the inside). It is preferable to reciprocate within the range. This is because if the movement of the intermediate roll is within this range, rolling can be performed without adversely affecting the shape of the metal strip after rolling. Preferably, it is within a range of 10 mm inward and 60 mm outward.
- the intermediate roll is a flat roll
- the roll end of the intermediate roll is literally the trunk end of the intermediate roll and the intermediate roll is tapered as shown in FIG. In the case of a roll, as shown in FIG. 2 (b), it means a boundary portion (shoulder portion) between the flat portion and the tapered portion.
- the pattern when the intermediate roll reciprocates is as follows: (a) sine wave pattern, (b) triangular wave pattern, (c) trapezoidal wave pattern, (d) (step wave + triangular wave) )
- steps there are patterns, and any pattern may be used. From the viewpoint of stabilizing the metal strip shape after rolling and stabilizing the rolling load, the (step) (step wave + triangular wave) pattern is adopted. Is most preferred.
- the roll end portion of the intermediate roll preferably reciprocates within the range of 110 mm, which is 30 mm inward and 80 mm outward from the width end of the metal strip.
- the stroke in the axial direction is preferably in the range of 5 to 60 mm. If the amount of movement is less than 5 mm, the effect of preventing the plate path is small. On the other hand, if it exceeds 60 mm, the shape of the metal strip after rolling will be adversely affected, leading to shape defects such as ear extension (end extension). is there. More preferably, it is within the range of 10 to 30 mm.
- the moving speed is preferably 0.5 to 4.0 mm / sec regardless of whether the rolling speed is low or high. If the moving speed is less than 0.5 mm / sec, the effect of preventing the plate path is small. On the other hand, if it exceeds 4.0 mm / sec, a sudden change occurs in the shape of the metal strip after rolling, which may cause rolling troubles such as drawing. It is because it becomes the cause of occurrence. More preferably, it is in the range of 1.0 to 2.0 mm / sec.
- only the upper intermediate roll or only the lower intermediate roll may be reciprocated in the roll axis direction. From the viewpoint of preventing this, it is preferable to move the upper and lower intermediate rolls back and forth simultaneously and in opposite directions.
- the cold rolling method of the present invention when applied to a tandem cold rolling mill, it is preferably applied to a subsequent stand, for example, in the case of a 5-stand tandem cold rolling mill, Application to # 4 and / or # 5 stands is preferred. This is because it is the rear stage stand that greatly affects the surface quality of the product, and multiple rolling mills having intermediate rolls are often provided on the rear stage stand.
- the present invention is applied to the # 4 stand of a tandem cold rolling mill which is composed of 5 stands and has a 6Hi rolling mill having an intermediate roll in the # 4 stand, and the plate thickness: 2.0 to 7.0 mm ⁇ plate
- An experiment was conducted in which a hot-rolled steel sheet having a width of 762 to 1880 mm was cold-rolled to a final thickness of 0.5 to 3.3 mm. The rolling conditions at this time are shown in Table 1.
- the length of the steel plate on the exit side of the # 5 stand during the movement of the intermediate roll by 10 mm that is, the rolling length at the # 5 stand is changed in various ways from 100 m to 400 m, and rolled to the steel plate surface after the rolling.
- the state of occurrence of the board road mark that occurred was evaluated.
- the plate path mark was also evaluated when the intermediate roll was not reciprocated.
- the said plate path mark evaluated the steel plate surface of # 4 stand and the steel plate surface of # 5 stand exit side visually over 30 m, and evaluated it with the following reference
- the plate mark marks “ ⁇ ” and “ ⁇ ” are defined as “accepted” ranges.
- Example 1 the stroke of the intermediate roll of the # 4 stand is changed in three stages of 2 mm, 30 mm, and 30 mm within the range of 100 to 300 m of rolling length at the final stand while moving the intermediate roll by 10 mm.
- the other rolling conditions remain as shown in Table 1, and the same hot-rolled steel sheet as in Example 1 is cold-rolled, and the plate path mark generated on the steel sheet surface after # 4 stand and # 5 stand rolling And the steel plate shape on the exit side of the rolling mill were evaluated.
- the plate path mark was evaluated according to the evaluation criteria of Example 1, and the steel plate shape was evaluated according to the following criteria.
- the steel sheet shapes are set to “acceptable” ranges as “ ⁇ ” and “ ⁇ ”.
- ⁇ Good shape (Steepness difference in the plate width direction is less than 0.3%)
- ⁇ Slight extension (end extension) (steepness difference in the plate width direction is 0.3 to 0.5%)
- X Ear extension (end extension) occurs (steepness difference in the plate width direction exceeds 0.5%)
- Example 1 As in Example 1, an experiment was conducted in which a hot-rolled steel sheet having a thickness of 2.0 to 7.0 mm ⁇ sheet width: 762 to 1880 mm was cold-rolled to a final thickness of 0.5 to 3.3 mm.
- the cold rolling conditions are based on the conditions described in Table 1, changing the movement range of the intermediate roll end, the moving speed of the intermediate roll and the moving intermediate roll as shown in Table 4, and While the intermediate roll was moved 10 mm, the rolling length at the final stand was changed in the range of 100 to 300 m. Then, about the steel plate after the said cold rolling, the generation
Abstract
Description
まず、本発明は、中間ロールをロール軸方向に往復移動させることによって、バックアップロールへの板道マークの転写を防止するとともに、バックアップロール表面を研削することによって既に生じていた板道マークを軽減し、除去する技術である。したがって、本発明が金属帯の圧延に使用する冷間圧延機は、少なくとも上下1対のワークロールと、上下1対の中間ロールおよび上下1対のバックアップロールを有し、かつ、上記中間ロールをロール軸方向に移動させることができるシフト機能を有する6Hi以上の多重圧延機であることが必要である。図1は、一例として、本発明に用いることができる、上下1対のワークロール(1、1´)と、上下1対の中間ロール(2、2´)および上下1対のバックアップロール(3、3´)とから構成され、上記中間ロール2,2´をロール軸方向に移動(シフト)させることができるシフト機能を有する6Hi圧延機を示した模式図である。なお、上記圧延機は、単スタンドからなるシングル圧延機でも、複数スタンドからなるタンデム式圧延機でもよい。
記
〇:板道マークの転写なし(#4スタンド、#5スタンド出側の鋼板表面のいずれにも板道マークが確認されない。)
△:板道マークの軽微な転写あり(#4スタンド出側の鋼板表面には転写が確認されるが、#5スタンド出側の鋼板表面には転写が確認されない。)
×:板道マークが発生(#4スタンド出側の鋼板表面に転写が確認され、かつ、#5スタンド出側の鋼板表面にも転写が確認される。)
記
○:形状良好(板幅方向の急峻度差が0.3%未満)
△:耳延び(端延び)軽微(板幅方向の急峻度差が0.3~0.5%)
×:耳延び(端延び)発生(板幅方向の急峻度差が0.5%超え)
1´:下ワークロール
2:上中間ロール
2´:下中間ロール
3:上バックアップロール
3´:下バックアップロール
4:金属帯(金属ストリップ)
Claims (5)
- 少なくとも上下1対のワークロール、上下1対の中間ロールおよび上下1対のバックアップロールを備える圧延機を用いて金属帯を冷間圧延する方法において、
少なくとも一方の中間ロールをロール軸方向に往復移動しながら金属帯を圧延することを特徴とする金属帯の冷間圧延方法。 - 上記中間ロールのロール端部の位置を、金属帯の幅端部から内側へ30mm、外側へ80mmの範囲内で往復移動させることを特徴とする請求項1に記載の金属帯の冷間圧延方法。
- 上記中間ロールの往復移動のストロークを、5~60mmの範囲内とすることを特徴とする請求項1または2に記載の金属帯の冷間圧延方法。
- 上記中間ロールの往復移動の移動速度を0.5~4.0mm/secとすることを特徴とする請求項1~3のいずれか1項に記載の金属帯の冷間圧延方法。
- 上記1対の中間ロールを互いに逆方向に往復移動させることを特徴とする請求項1~4のいずれか1項に記載の金属帯の冷間圧延方法。
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KR1020207027039A KR102371055B1 (ko) | 2018-03-23 | 2019-03-18 | 금속대의 냉간 압연 방법 |
CN201980019405.0A CN111867744B (zh) | 2018-03-23 | 2019-03-18 | 金属带的冷轧方法 |
JP2019540679A JP6767686B2 (ja) | 2018-03-23 | 2019-03-18 | 金属帯の冷間圧延方法 |
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JP2018-056538 | 2018-03-23 | ||
JP2018056538 | 2018-03-23 |
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PCT/JP2019/011103 WO2019181832A1 (ja) | 2018-03-23 | 2019-03-18 | 金属帯の冷間圧延方法 |
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JP (1) | JP6767686B2 (ja) |
KR (1) | KR102371055B1 (ja) |
CN (1) | CN111867744B (ja) |
WO (1) | WO2019181832A1 (ja) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6027403A (ja) * | 1983-07-26 | 1985-02-12 | Mitsubishi Heavy Ind Ltd | 圧延方法 |
JPS61232002A (ja) * | 1985-04-08 | 1986-10-16 | Hitachi Ltd | 冷間圧延機の圧延方法 |
JPH07100503A (ja) * | 1993-10-05 | 1995-04-18 | Nippon Steel Corp | 表面光沢の良好な板の圧延方法 |
JP2001225101A (ja) * | 2000-02-14 | 2001-08-21 | Kawasaki Steel Corp | 冷間圧延方法 |
JP2008504128A (ja) * | 2004-06-28 | 2008-02-14 | エス・エム・エス・デマーク・アクチエンゲゼルシャフト | ロールスタンドにおいてストリップを圧延するための方法 |
Family Cites Families (5)
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JP2003300134A (ja) | 2002-04-08 | 2003-10-21 | Jfe Steel Kk | オンラインロールグラインダー、及び、それによる圧延機ワークロール研削方法 |
JP2006055895A (ja) | 2004-08-23 | 2006-03-02 | Jfe Steel Kk | オンラインロール研削装置および圧延ロールの研削方法 |
JP4847111B2 (ja) * | 2005-11-29 | 2011-12-28 | 株式会社日立製作所 | 多段式圧延機及び多段式圧延機の制御方法 |
JP2010162546A (ja) | 2009-01-13 | 2010-07-29 | Jfe Steel Corp | 冷間タンデム圧延機のバックアップロールの研削方法、冷間タンデム圧延機ならびに冷延金属板の製造方法 |
CN106475422B (zh) * | 2015-08-31 | 2018-07-06 | 宝山钢铁股份有限公司 | 高次板形控制方法 |
-
2019
- 2019-03-18 JP JP2019540679A patent/JP6767686B2/ja active Active
- 2019-03-18 CN CN201980019405.0A patent/CN111867744B/zh active Active
- 2019-03-18 WO PCT/JP2019/011103 patent/WO2019181832A1/ja active Application Filing
- 2019-03-18 KR KR1020207027039A patent/KR102371055B1/ko active IP Right Grant
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6027403A (ja) * | 1983-07-26 | 1985-02-12 | Mitsubishi Heavy Ind Ltd | 圧延方法 |
JPS61232002A (ja) * | 1985-04-08 | 1986-10-16 | Hitachi Ltd | 冷間圧延機の圧延方法 |
JPH07100503A (ja) * | 1993-10-05 | 1995-04-18 | Nippon Steel Corp | 表面光沢の良好な板の圧延方法 |
JP2001225101A (ja) * | 2000-02-14 | 2001-08-21 | Kawasaki Steel Corp | 冷間圧延方法 |
JP2008504128A (ja) * | 2004-06-28 | 2008-02-14 | エス・エム・エス・デマーク・アクチエンゲゼルシャフト | ロールスタンドにおいてストリップを圧延するための方法 |
Also Published As
Publication number | Publication date |
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CN111867744B (zh) | 2023-05-12 |
CN111867744A (zh) | 2020-10-30 |
JPWO2019181832A1 (ja) | 2020-04-30 |
KR102371055B1 (ko) | 2022-03-04 |
KR20200119876A (ko) | 2020-10-20 |
JP6767686B2 (ja) | 2020-10-14 |
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