WO2018034061A1 - 鋼板の冷間圧延方法および鋼板の製造方法 - Google Patents
鋼板の冷間圧延方法および鋼板の製造方法 Download PDFInfo
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- WO2018034061A1 WO2018034061A1 PCT/JP2017/023155 JP2017023155W WO2018034061A1 WO 2018034061 A1 WO2018034061 A1 WO 2018034061A1 JP 2017023155 W JP2017023155 W JP 2017023155W WO 2018034061 A1 WO2018034061 A1 WO 2018034061A1
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- Prior art keywords
- stand
- rolling
- steel sheet
- work roll
- final stand
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Classifications
-
- 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
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
-
- 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
-
- 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
- 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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
- B21B45/0245—Lubricating devices
- B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
- B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates
-
- 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
- B21B2001/221—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 by cold-rolling
Definitions
- the present invention relates to a method for cold rolling a steel plate and a method for producing a steel plate.
- the present invention relates to a method for cold rolling a steel plate and a method for producing a steel plate, which are suitable for producing an electromagnetic steel plate having excellent thickness accuracy with high efficiency.
- Electromagnetic steel sheets are used as core materials for electrical equipment such as rotating machines.
- electrical steel sheets with lower iron loss and higher magnetic flux density have been demanded from the viewpoint of energy saving of electrical equipment, and improvement of magnetic properties of electrical steel sheets has become increasingly important.
- electromagnetic steel sheets are usually used as an iron core by punching them into a predetermined shape and then laminating them.
- the thickness variation of the product is large, the characteristics as the iron core will deteriorate, so high thickness accuracy is required as well as the magnetic characteristics.
- the demands for plate thickness accuracy are severe.
- the magnetic steel sheet is required to have a high thickness accuracy, and the characteristics of the iron core are deteriorated even in the case of a minute thickness fluctuation that cannot be detected by a vibration meter or the like. For this reason, it is difficult to completely suppress the strict plate thickness accuracy required for the electromagnetic steel sheet by the method of detecting the friction coefficient and controlling the chattering as in the methods described in Patent Documents 1 and 2.
- Patent Document 3 discloses a method for detecting chattering by installing a vibrometer in a mill housing and analyzing the frequency of the vibration. However, in the method described in Patent Document 3, it is possible to prevent a product with low plate thickness accuracy due to chattering from flowing into the lower process, but it is possible to manufacture a product with excellent plate thickness accuracy. difficult.
- the present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for cold rolling and manufacturing a steel plate excellent in sheet thickness accuracy with high efficiency.
- the inventors of the present invention paid attention to the relationship between the plate thickness variation and the work roll roughness when cold rolling the steel plate with a tandem rolling mill.
- the thickness variation can be suppressed to 3 ⁇ m or less by setting the work roll roughness of the last stand and / or the work roll roughness of the stand immediately before the final stand within a predetermined roughness range. did.
- variation could be suppressed by supplying a high concentration rolling oil to a tandem rolling mill. That is, when cold rolling a steel sheet with a tandem rolling mill, the work roll roughness of the final stand, the work roll roughness of the stand immediately before the final stand, and the rolling oil (introduced oil) are controlled.
- the present inventors have found that it is possible to produce a steel plate with excellent plate thickness accuracy with high efficiency, and the present invention has been completed.
- the present invention is based on the above findings, and features are as follows.
- the roll bite introduced oil film thickness h at the final stand calculated by the following formula (1)
- the work of the final stand roll roughness R N and the rolling oil as the following numbers (2) represented by the work rolls of the preceding stand final stand roughness R N-1 is 0.5 or more tandem
- a method for cold rolling a steel sheet characterized in that the steel sheet is supplied to a rolling mill.
- one of the important requirements of the present invention is to suppress sheet thickness fluctuations by supplying a high-concentration rolling oil to a tandem rolling mill.
- a high-concentration rolling oil from another rolling oil supply system to the tandem rolling mill (final stand)
- the rolling load of the final stand and the stand before the final stand is reduced, and the steel plate Suppresses minute plate thickness fluctuations that occur in
- the work roll roughness of the final stand and / or the work roll roughness of the stand immediately before the final stand is defined within a predetermined range. This is also an important requirement in the present invention.
- the work roll roughness of the stand just before the final stand is transferred to the steel plate surface to reduce the steel plate surface roughness on the final stand entry side. It is thought that thickness fluctuation is suppressed.
- the method for determining the roll bite introduced oil film thickness (h) was as follows.
- the roll bite introduced oil film thickness (h) was calculated using equation (1) in consideration of the plate-out film thickness (h 1 ) of the steel sheet. It is considered that the plate-out film thickness (h 1 ) of the steel sheet is determined by the rolling oil supply amount (Q) and the plate-out efficiency (A).
- the roll bite introduced oil film thickness (h) is determined by the rolling oil properties such as the viscosity ( ⁇ ) and pressure viscosity coefficient ( ⁇ ) of the rolling oil, the flat roll radius (R ′) and the final It varies depending on rolling conditions such as the roll speed (V 1 ) of the stand. Therefore, these are arranged, and in the present invention, the roll bite introduced oil film thickness (h) is obtained by the equation (1).
- the plate-out efficiency is a numerical value measured in advance under each rolling oil supply condition.
- Table 1 shows the work roll roughness of the final stand, the work roll roughness of the stand immediately before the final stand, and the calculated oil film thickness (roll bite introduced oil film thickness (h)) under each condition.
- the ratio of the roll bite introduced oil film thickness to the work roll roughness (work roll roughness of the last stand and work roll roughness of the stand before the last stand) defined by the formula (2) It was found that the plate thickness variation can be suppressed by setting the thickness to 0.5 or more.
- the work roll roughness of the final stand is 0.03 ⁇ mRa or more and 0.15 ⁇ mRa or less, and / or the work roll roughness of the stand immediately before the final stand is 0.03 ⁇ mRa or more and 0.25 ⁇ mRa or less, further increasing the thickness It was found that fluctuations can be suppressed.
- the minimum of work roll roughness does not need to be specifically limited.
- the polishing load of the work roll is increased, which is not preferable.
- the work roll roughness of the final stand is 0.03 ⁇ mRa or more and 0.07 ⁇ mRa or less, and the work roll roughness of the stand immediately before the final stand is 0.03 ⁇ mRa or more and 0.16 ⁇ mRa or less.
- the magnetic steel sheet was cold-rolled by a tandem rolling mill equipped with 5 quadruple rolling mills, and the defect occurrence rate of sheet thickness fluctuation was evaluated.
- Si coil 3.1% to 3.7% by mass
- 100 coils of 1.8mm thick steel sheet were prepared, and finished to a sheet thickness of 0.25mm at a rolling speed (final stand exit side sheet speed) of 700mpm.
- the conditions are shown in Table 2.
- the work roll was changed every 20 to 30 coils.
- the roll roughness was measured before and after the work roll exchange, and Table 2 shows the maximum value and the minimum value of the roughness (Ra).
- a second rolling oil system (a rolling oil supply system different from the rolling oil circulation system that circulates and supplies the rolling oil) is used according to the roughness of the work roll, and an oil film that is calculated (roll bite)
- the introduced oil film thickness (h)) was controlled, and the ratio of the roll bite introduced oil film thickness (h) to the work roll roughness defined by the formula (2) was set to 0.5 or more.
- the plate thickness variation was measured by the same method as described above, and when there was a variation of 3 ⁇ m or more, the plate thickness was defective, and the ratio to the whole (100 coils) was the defective rate. The results obtained are shown in Table 2 together with the conditions.
- the defect rate of the plate thickness variation is 4.30 to 9.40%, whereas in the example of the present invention, the defect rate is reduced to 2.10% or less.
- the second By properly controlling the oil film thickness (the roll bite introduction oil film thickness at the final stand) using the rolling oil system, it is possible to achieve a highly efficient steel sheet that is particularly excellent in sheet thickness accuracy.
- the cold rolling method of the present invention is suitable for electrical steel sheets that require strict sheet thickness accuracy.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Metal Rolling (AREA)
Abstract
Description
[1]圧延油を循環して供給する方式のタンデム圧延機により、鋼板を冷間圧延するに際し、下記(1)式で計算される最終スタンドでのロールバイト導入油膜厚h、最終スタンドのワークロール粗さRN、及び、最終スタンドの1つ前のスタンドのワークロール粗さRN-1で表される下記(2)式の数値が0.5以上となるように圧延油を前記タンデム圧延機に供給することを特徴とする鋼板の冷間圧延方法。
[3]前記タンデム圧延機最終スタンドの入側に、圧延油を循環供給する圧延油循環系統とは別の圧延油供給系統を設置し、該別の圧延油供給系統から、前記圧延油循環系統よりも高濃度の圧延油を前記タンデム圧延機に供給することを特徴とする上記[1]または[2]に記載の鋼板の冷間圧延方法。
[4]上記[1]~[3]のいずれかに記載の鋼板の冷間圧延方法を用いて、鋼板を製造することを特徴とする鋼板の製造方法。
5スタンドからなるタンデム圧延機にて、板厚2.0mmの電磁鋼板を仕上げ厚0.25mmまで、圧延速度(最終スタンド出側の板速度)700mpmで冷間圧延し、板厚変動の発生状況を調査した。圧延油には、エステルを基油とする20cStの圧延油を濃度3%で使用した。この際、ワークロールの目標粗さを表1に示すように設定した。#4std.(4つ目のスタンドであり最終スタンドの1つ前のスタンド)を0.10μmRa、0.20μmRaの2水準、#5std.(5つ目のスタンドであり最終スタンド)を0.05μmRa、0.10μmRaの2水準で組み合わせ、それぞれの条件で10~20コイルを圧延し、板厚変動を調査した。鋼板長手方向中央かつ板幅中央である箇所について長手方向500mmの板厚変動をダイヤルゲージで測定し、3μm以上の変動がある場合を板厚不良とした。得られた結果を表1に示す。
表1に示すように、#4std.、#5std.ともにワークロール粗さが小さい条件において、板厚変動が発生していないことが分かる。最終スタンドのワークロール粗さは小さければ小さいほど、圧延荷重は低下し、板厚変動抑制には有効と考えられる。また、最終スタンドの1つ前のスタンドのワークロール粗さは、鋼板表面に転写して、最終スタンド入側の鋼板表面粗さを小さくするため、最終スタンドの圧延荷重を小さくする効果により、板厚変動を抑制していると考えられる。
4重式圧延機を5スタンド備えたタンデム圧延機にて電磁鋼板を冷間圧延し、板厚変動の不良発生率を評価した。各条件において、Si含有量:3.1質量%以上3.7質量%以下、板厚1.8mmの電磁鋼板を100コイル用意し、圧延速度(最終スタンド出側の板速度)700mpmで板厚0.25mmに仕上げた。
条件を表2に示す。各条件ともに、20~30コイル毎にワークロールを交換したが、ワークロール交換前後にロール粗さを測定し、表2に粗さ(Ra)の最大値と最小値を記載した。本発明例では、ワークロールの粗さに応じ、第2の圧延油系統(圧延油を循環供給する圧延油循環系統とは別の圧延油供給系統)を使用し、計算される油膜(ロールバイト導入油膜厚(h))を制御し、式(2)で定義する、ロールバイト導入油膜厚(h)とワークロール粗さの比が0.5以上になるように設定した。板厚変動を前述と同様の手法にて測定し、3μm以上の変動がある場合を板厚不良とし、全体(100コイル)に対する割合を不良率とした。
得られた結果を条件と併せて表2に示す。
Claims (4)
- 前記最終スタンドのワークロール粗さRNを0.03μmRa以上0.15μmRa以下、および/または、前記最終スタンドの1つ前のスタンドのワークロール粗さRN-1を0.03μmRa以上0.25μmRa以下とすることを特徴とする請求項1に記載の鋼板の冷間圧延方法。
- 前記タンデム圧延機最終スタンドの入側に、圧延油を循環供給する圧延油循環系統とは別の圧延油供給系統を設置し、該別の圧延油供給系統から、前記圧延油循環系統よりも高濃度の圧延油を前記タンデム圧延機に供給することを特徴とする請求項1または2に記載の鋼板の冷間圧延方法。
- 請求項1~3のいずれか一項に記載の鋼板の冷間圧延方法を用いて、鋼板を製造することを特徴とする鋼板の製造方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP17841289.6A EP3473346B1 (en) | 2016-08-19 | 2017-06-23 | Method for cold rolling steel sheet, and method for manufacturing steel sheet |
CN201780047949.9A CN109562421B (zh) | 2016-08-19 | 2017-06-23 | 钢板的冷轧方法以及钢板的制造方法 |
KR1020197003221A KR102206451B1 (ko) | 2016-08-19 | 2017-06-23 | 강판의 냉간 압연 방법 및 강판의 제조 방법 |
JP2017546746A JP6241582B1 (ja) | 2016-08-19 | 2017-06-23 | 鋼板の冷間圧延方法および鋼板の製造方法 |
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KR (1) | KR102206451B1 (ja) |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN113263061A (zh) * | 2021-03-30 | 2021-08-17 | 唐山钢铁集团有限责任公司 | 一种轧辊原始粗糙度综合优化设定方法 |
JP2021530359A (ja) * | 2018-07-24 | 2021-11-11 | バオシャン アイアン アンド スティール カンパニー リミテッド | 冷間連続圧延機の振動を抑制するためのエマルションフロー最適化方法 |
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DE102022117835A1 (de) | 2022-07-18 | 2024-01-18 | Schaeffler Technologies AG & Co. KG | Rotorpositionserfassung, Auswertevorrichtung und Antriebsvorrichtung |
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- 2017-06-23 KR KR1020197003221A patent/KR102206451B1/ko active IP Right Grant
- 2017-06-23 CN CN201780047949.9A patent/CN109562421B/zh active Active
- 2017-06-23 WO PCT/JP2017/023155 patent/WO2018034061A1/ja active Application Filing
- 2017-07-05 TW TW106122540A patent/TWI624313B/zh active
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JP2021530359A (ja) * | 2018-07-24 | 2021-11-11 | バオシャン アイアン アンド スティール カンパニー リミテッド | 冷間連続圧延機の振動を抑制するためのエマルションフロー最適化方法 |
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CN113263061B (zh) * | 2021-03-30 | 2022-10-18 | 唐山钢铁集团有限责任公司 | 一种轧辊原始粗糙度综合优化设定方法 |
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Publication number | Publication date |
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KR20190025008A (ko) | 2019-03-08 |
CN109562421A (zh) | 2019-04-02 |
EP3473346A4 (en) | 2019-04-24 |
CN109562421B (zh) | 2020-04-14 |
EP3473346A1 (en) | 2019-04-24 |
KR102206451B1 (ko) | 2021-01-27 |
TW201806678A (zh) | 2018-03-01 |
TWI624313B (zh) | 2018-05-21 |
EP3473346B1 (en) | 2020-01-08 |
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