JP7226381B2 - cold rolling method - Google Patents

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JP7226381B2
JP7226381B2 JP2020067190A JP2020067190A JP7226381B2 JP 7226381 B2 JP7226381 B2 JP 7226381B2 JP 2020067190 A JP2020067190 A JP 2020067190A JP 2020067190 A JP2020067190 A JP 2020067190A JP 7226381 B2 JP7226381 B2 JP 7226381B2
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JP2021159982A (en
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樹 稲盛
憲 栗栖
健太郎 石井
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JFE Steel Corp
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Description

本発明は、極薄鋼板の冷間圧延方法に係り、とくに、通板速度の減速時に、板厚不良(オフゲージ)や板破断を抑制できる二次冷間圧延方法に関する。なお、ここでいう「極薄鋼板」とは、板厚が概ね0.10~0.25mmの鋼板をいうものとする。 TECHNICAL FIELD The present invention relates to a cold rolling method for ultra-thin steel sheets, and more particularly to a secondary cold rolling method capable of suppressing sheet thickness defects (off-gauge) and sheet breakage when the sheet threading speed is reduced. The term "ultrathin steel sheet" as used herein refers to a steel sheet having a thickness of approximately 0.10 to 0.25 mm.

缶用鋼板等の、板厚が凡そ0.10~0.25mmの極薄鋼板を製造するために、冷間圧延(一次冷間圧延)後に、さらに焼鈍処理を施し、ついで圧下率が30%程度の冷間圧延(二次冷間圧延)を行う場合がある。この焼鈍処理後の二次冷間圧延では、板厚が薄いため、通常の冷間圧延よりも板破断が起きやすいという問題がある。例えば、複数のペイオフリールから払い出された鋼板は、連続焼鈍を行うために溶接により接続されるが、板厚が薄いため、多くの場合マッシュシーム溶接が用いられ、溶接点は鋼板板厚より厚くなる。このような溶接点に、そのまま30%程度の高圧下圧延を施すと、板破断する恐れがある。 In order to manufacture ultra-thin steel sheets with a thickness of about 0.10 to 0.25 mm, such as steel sheets for cans, after cold rolling (primary cold rolling), further annealing treatment is performed, followed by cooling with a rolling reduction of about 30%. Rolling (secondary cold rolling) may be performed. In the secondary cold rolling after the annealing treatment, since the plate thickness is thin, there is a problem that plate breakage is more likely to occur than in normal cold rolling. For example, steel sheets discharged from multiple payoff reels are connected by welding for continuous annealing. thicken. If such welding points are directly subjected to high pressure rolling of about 30%, there is a risk that the plate will break.

このような問題に対し、例えば、特許文献1には、連続焼鈍炉出側の二次冷間圧延機における溶接点通過方法が提案されている。特許文献1に記載された技術は、連続焼鈍炉の出側に位置する冷間圧延機を鋼板の溶接点が通過する際、通板速度を低下させるとともに圧延荷重を低下させ、さらに複数ある圧延スタンドについて、圧延スタンド入側、圧延スタンド間、圧延スタンド出側の各張力を低張力一定制御とした状態とし、溶接点が通過した後は板厚一定制御に復帰させる、二次冷間圧延機における溶接点通過方法である。この技術によれば、溶接点をミルオープンせずとも、板破断が生ずることなく通過させることができ、しかも定常状態への復帰を迅速に行うことができ、オフゲージの短縮化を図ることができる、としている。 In order to solve such a problem, for example, Patent Document 1 proposes a method of passing a welding point in a secondary cold rolling mill on the delivery side of a continuous annealing furnace. The technology described in Patent Document 1 reduces the threading speed and the rolling load when the welding point of the steel plate passes through the cold rolling mill located on the delivery side of the continuous annealing furnace, and furthermore, reduces the rolling load. A secondary cold rolling mill in which each tension on the stand entrance side, between the rolling stands, and on the exit side of the rolling stand is under constant low tension control, and after the welding point has passed, the plate thickness constant control is restored. It is a welding point passing method in. According to this technique, it is possible to pass the welding point without breaking the plate without mill opening, and moreover, it is possible to quickly return to the steady state, and it is possible to shorten the off-gauge. , and.

特開2007-229790号公報Japanese Patent Application Laid-Open No. 2007-229790

特許文献1に記載された技術では、溶接点が冷間圧延機を通過する際に、通板速度を減速して低張力一定制御を行っている。しかしながら、低張力一定制御を行うと、板厚が変動しても冷間圧延機の制御にフィードバックすることができず、オフゲージが発生するという問題がある。一度、オフゲージが発生すると、オフゲージ部分を除去する作業を必要とし、歩留りの低下や、作業能率の低下を招くことになる。とくに、製品の長手方向中央部で、オフゲージが発生すれば、歩留の低下や作業能率の低下は格段に大きなものとなる。 In the technique described in Patent Literature 1, when the welding point passes through the cold rolling mill, the sheet threading speed is reduced to perform constant low tension control. However, when the constant low tension control is performed, even if the strip thickness fluctuates, it cannot be fed back to the control of the cold rolling mill, resulting in off-gauge. Once the off-gauge occurs, work is required to remove the off-gauge portion, which leads to a decrease in yield and a decrease in work efficiency. In particular, if the off-gauge occurs in the central portion of the product in the longitudinal direction, the yield and working efficiency will be greatly reduced.

そこで、本発明は、極薄鋼板の製造に当たり、通板速度を減速しても、オフゲージの発生や板破断の発生を抑制できる冷間圧延方法を提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a cold rolling method capable of suppressing the occurrence of off-gauge and strip breakage even when the strip-threading speed is reduced in the production of ultra-thin steel sheets.

本発明者らは、上記した目的を達成するため、極薄鋼板の冷間圧延において、オフゲージの発生や板破断の発生に影響する各種要因について鋭意検討した。その結果、極薄鋼板の冷間圧延時に、上記した溶接点が冷間圧延機を通過する時以外にも、例えば、ライントラブルや、鋼板の特定位置(例えば、ライン出側で入側コイルを分割したい場合の分割点など)などのように、通板速度を減速して、通常より低い通板速度(低速域)で圧延する必要が生じる場合がある。 In order to achieve the above-described object, the present inventors diligently studied various factors that affect the occurrence of off-gauge and strip breakage in the cold rolling of ultra-thin steel sheets. As a result, during the cold rolling of ultra-thin steel sheets, other than when the above-described weld points pass through the cold rolling mill, for example, line troubles and specific positions of the steel sheets (for example, the entry side coil on the line exit side) There are cases where it is necessary to reduce the strip threading speed and roll at a lower than normal strip threading speed (low speed range), such as at a split point when splitting is desired.

このような場合に、例えば、圧延スタンド出側張力やロールベンダーによるベンド量が、通板速度の減速前と同じである場合には、鋼板の幅方向中央部の伸び差率が鋼板端部のそれよりも大きくなり中伸び状態となるため、幅方向端部に引張応力が集中し、圧延スタンド出側で耳割れを生じ、さらに耳割れが大きくなると板破断に至る場合のあることを知見した。 In such a case, for example, if the tension on the delivery side of the rolling stand and the amount of bending by the roll bender are the same as before the reduction in the strip threading speed, the rate of differential elongation at the center in the width direction of the steel plate is Since it becomes larger than that and it is in a state of medium elongation, tensile stress is concentrated at the end in the width direction, causing edge cracks on the delivery side of the rolling stand. .

そこで、オフゲージの発生を防止(抑制)するとともに板破断の発生を防止(抑制)するという観点から、通板速度の変動(減速)が生じても、板厚一定制御で圧延することに思い至った。そして、さらに、通板速度の減速(変動)に伴い、圧延スタンド出側張力およびロールベンダーによるベンド量の少なくとも一つを、通板速度を減速する前のそれぞれの値に比べて低く設定し、圧延することにした。これにより、オフゲージの発生が抑制されるとともに、板幅方向端部に引張応力が集中することがなくなり、耳割れによる板破断を抑制することができることを知見した。また、本発明者らの検討によると、とくに、鋼板の通板速度を、300mpm以下の低速域まで減速すると、圧延荷重が顕著に低下することを知見した。 Therefore, from the viewpoint of preventing (suppressing) the occurrence of off-gauge and preventing (suppressing) the occurrence of strip breakage, I came up with the idea of rolling with constant strip thickness control even if the strip threading speed fluctuates (decelerates). rice field. Further, with the deceleration (fluctuation) of the strip threading speed, at least one of the tension at the delivery side of the rolling stand and the bend amount by the roll bender is set lower than the respective values before deceleration of the strip threading speed, I decided to roll. As a result, it has been found that generation of off-gauge is suppressed, tensile stress is not concentrated on the edges in the sheet width direction, and sheet breakage due to edge cracks can be suppressed. Further, according to the study of the present inventors, it has been found that the rolling load is significantly reduced particularly when the steel sheet threading speed is reduced to a low speed range of 300 mpm or less.

本発明は、上記した知見に基づき、さらに検討を加えて完成されたものである。すなわち、本発明の要旨はつぎのとおりである。
[1]薄鋼板を冷間圧延機を用いて冷間圧延し極薄鋼板とする冷間圧延方法において、通板速度を減速して低速域の通板速度で冷間圧延するに当たり、
前記冷間圧延機の圧延スタンド出側張力およびロールベンダーによるベンド量の少なくとも1つを、前記通板速度を減速する前のそれぞれの値に比べて低く設定して板厚一定制御で圧延することを特徴とする冷間圧延方法。
[2]前記低速域の通板速度が、300mpm以下であることを特徴とする[1]に記載の冷間圧延方法。
The present invention has been completed based on the above findings and further studies. That is, the gist of the present invention is as follows.
[1] In the cold-rolling method of cold-rolling a thin steel sheet using a cold rolling mill to form an ultra-thin steel sheet, in cold-rolling at a low-speed range by reducing the threading speed,
At least one of the tension on the delivery side of the rolling stand of the cold rolling mill and the bending amount by the roll bender is set lower than the respective values before the strip threading speed is reduced, and the strip is rolled under constant thickness control. A cold rolling method characterized by
[2] The cold rolling method according to [1], wherein the sheet threading speed in the low speed region is 300 mpm or less.

本発明によれば、二次冷間圧延において、オフゲージや板破断の発生を防止でき、歩留りの低下、作業能率の低下を抑制できるという、産業上格段の効果を奏する。また、本発明によれば、通板速度の変動に応じて圧延スタンド出側張力およびロールベンダーによるベンド量を制御するため、通板速度によらず、板の平坦度が好ましい範囲となるような形状制御が可能になるという効果もある。 Advantageous Effects of Invention According to the present invention, it is possible to prevent occurrence of off-gauge and strip breakage in secondary cold rolling, and to suppress reduction in yield and work efficiency. Further, according to the present invention, since the tension on the delivery side of the rolling stand and the bending amount by the roll bender are controlled in accordance with the fluctuation of the strip threading speed, the flatness of the strip is within a preferable range regardless of the strip threading speed. There is also an effect that shape control becomes possible.

本発明の実施に好適な、冷間圧延機の構成の一例を示す説明図である。BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows an example of a structure of a cold rolling mill suitable for implementation of this invention. 本発明の場合における横軸を時間とする、通板速度の変化、圧延スタンド出側張力およびロールベンダーによるベンド量の変化と、圧延荷重の変化、板厚偏差と、の関係を示すグラフである。4 is a graph showing the relationship between changes in strip threading speed, changes in tension on the delivery side of a rolling stand, changes in bend amount due to a roll bender, changes in rolling load, and strip thickness deviation, with the horizontal axis representing time in the case of the present invention. . 本発明範囲を外れる場合における横軸を時間とする、通板速度の変化、圧延スタンド出側張力およびロールベンダーによるベンド量の変化と、圧延荷重の変化、板厚偏差と、の関係を示すグラフである。A graph showing the relationship between the change in strip threading speed, the tension on the delivery side of the rolling stand, the bend amount by the roll bender, the change in the rolling load, and the strip thickness deviation, with the horizontal axis representing time when the range is outside the scope of the present invention. is.

本発明は、被圧延材である薄鋼板に、冷間圧延を施し、極薄鋼板とする冷間圧延方法である。とくに好ましくは、冷延後、焼鈍済みの薄鋼板に冷間圧延を施し、缶用等の極薄鋼板とする冷間圧延方法(二次冷間圧延方法)である。本発明の実施に際しては、単スタンドの4段圧延機または6段圧延機あるいは複数スタンドの4段圧延機または6段圧延機を備える冷間圧延機がいずれも好適である。 The present invention is a cold rolling method for cold-rolling a thin steel plate, which is a material to be rolled, to obtain an ultra-thin steel plate. Particularly preferred is a cold rolling method (secondary cold rolling method) in which, after cold rolling, the annealed thin steel sheet is subjected to cold rolling to obtain an ultra-thin steel sheet for cans and the like. Cold rolling mills with either a single stand four or six high mill or a multi-stand four or six high mill are suitable for the practice of the present invention.

図1に、2スタンドの4段圧延機を備える冷間圧延機の例を示す。図1に示す冷間圧延機1は、入側ブライドルロール2、第1スタンドの4段圧延機3、第2スタンドの4段圧延機4、出側ブライドルロール5、入側板厚計6、出側板厚計7、を備える。なお、2スタンドの圧延スタンドを備える場合、通常の二次冷間圧延では第1スタンドが冷間圧延機、第2スタンドは調質圧延機としている。 FIG. 1 shows an example of a cold rolling mill equipped with a two-stand four-high rolling mill. The cold rolling mill 1 shown in FIG. A side plate thickness gauge 7 is provided. When two rolling stands are provided, the first stand is the cold rolling mill and the second stand is the temper rolling mill in normal secondary cold rolling.

極薄鋼板の冷間圧延では、通常、800~1000mpm程度の通板速度で圧延している。しかし、実機圧延では、溶接点が圧延スタンドを通過する際や、ライントラブル、あるいは、鋼板の特定位置(例えば、ライン出側で入側コイルを分割したい場合の分割点など)などのように、通常より低い通板速度(低速域)に減速して、圧延する必要が生じる場合がある。このような場合に、本発明では、常用の通板速度に比べて、通板速度を低下(減速)させて低速域の通板速度で板厚一定制御で冷間圧延を行う。なお、冷間圧延の当初から当該低速域の通板速度で冷間圧延を行っても良い。ここでいう「低速域」は、300mpm以下の領域の通板速度とすることが好ましい。通板速度を300mpm以下に減速すると、圧延荷重が顕著に低減する。なお、「低速域」は300mpm以下の30~300mpmの範囲とすることが好ましい。 In the cold rolling of ultra-thin steel sheets, the rolling speed is usually about 800 to 1000 mpm. However, in actual rolling, problems such as when the welding point passes the rolling stand, line trouble, or a specific position of the steel plate (for example, the split point when splitting the incoming coil on the outgoing side of the line) may occur. In some cases, it may be necessary to decelerate to a lower threading speed (lower speed range) than usual for rolling. In such a case, in the present invention, the strip threading speed is reduced (decelerated) compared to the normal strip threading speed, and cold rolling is performed at a lower strip threading speed with plate thickness constant control. It should be noted that cold rolling may be carried out at the sheet passing speed in the low range from the beginning of cold rolling. The "low speed range" referred to here is preferably a sheet threading speed in the range of 300 mpm or less. When the strip threading speed is reduced to 300 mpm or less, the rolling load is significantly reduced. It should be noted that the "low speed range" is preferably in the range of 30 to 300 mpm, which is 300 mpm or less.

本発明では、通板速度を低速域に減速したのち、好ましくは300mpm以下に減速したのちに、冷間圧延機における圧延スタンド出側張力およびロールベンダーによるベンド量の少なくとも1つを、通板速度を減速する前の圧延スタンド出側張力およびロールベンダーによるベンド量に比べそれぞれ低い値に設定(変更)する。 In the present invention, after reducing the strip threading speed to a low speed range, preferably to 300 mpm or less, at least one of the rolling stand delivery side tension in the cold rolling mill and the bend amount by the roll bender is adjusted to the strip threading speed is set (changed) to a lower value than the tension on the delivery side of the rolling stand before deceleration and the bend amount by the roll bender.

圧延スタンド出側張力では、通板速度を減速する前の圧延スタンド出側張力に比べて低い値に設定(変更)することが好ましい。例えば、2スタンドの圧延スタンドを備える場合には、スタンド間張力を変更する。ここで、「低い」値とは、通板速度を低減する前の圧延スタンド出側張力に比べ、10~30%程度の低減とすることが好ましい。 The tension on the delivery side of the rolling stand is preferably set (changed) to a value lower than the tension on the delivery side of the rolling stand before the strip threading speed is reduced. For example, if two rolling stands are provided, the tension between the stands is changed. Here, the "low" value is preferably a reduction of about 10 to 30% compared to the tension on the delivery side of the rolling stand before the strip threading speed is reduced.

ロールベンダーによるベンド量では、通板速度を減速する前のロールベンダーによるベンド量に比べ低い値に設定(変更)することが好ましい。ここで、ベンド量の「低い」値とは、通板速度を低減する前のベンド量に比べ、10~30%程度、低減した値とすることが好ましい。なお、本発明では、上記した圧延スタンド出側張力の設定変更と、上記したロールベンダーによるベンド量の設定変更を合わせ用いてもよい。 The amount of bending by the roll bender is preferably set (changed) to a lower value than the amount of bending by the roll bender before the sheet threading speed is reduced. Here, the "low" value of the bend amount is preferably a value that is reduced by about 10 to 30% compared to the bend amount before the sheet threading speed is reduced. In addition, in the present invention, the change in setting of the tension on the delivery side of the rolling stand and the change in setting of the bend amount by the roll bender may be used together.

このように、通板速度を常用の通板速度より低い低速域に設定するとともに、上記した圧延スタンド出側張力の設定変更および/またはロールベンダーによるベンド量の設定変更を合わせ行って、板厚一定制御で圧延することにより、製品の長手方向端部はもちろんのこと、それ以外の長手方向中央部についても、オフゲージを抑制することができるとともに、板幅方向端部に引張応力が集中することがなくなり、耳割れによる板破断を抑制することもできるようになる。 In this way, the strip threading speed is set to a lower speed range than the normal strip threading speed, and the setting change of the tension on the delivery side of the rolling stand and/or the setting change of the bend amount by the roll bender are also changed to reduce the strip thickness. By rolling with constant control, off-gauge can be suppressed not only at the longitudinal ends of the product, but also at the other longitudinal central parts, and tensile stress can be concentrated at the strip width direction ends. It becomes possible to suppress board breakage due to edge cracks.

本発明では、例えば図1に示す構成の冷間圧延機を用いて、通板速度を一度減速して低速域の通板速度にしたのち、好ましくは通板速度が300mpm以下となるとともに、第1圧延スタンド出側張力を減速前の設定に比べて低い値に設定し、さらにロールベンダーによるベンド量を減速前の設定に比べて低い値に設定して、板厚一定制御で圧延する。この場合について、通板速度の時間変化、第1スタンドの圧延荷重の時間変化、第1圧延スタンド出側張力の時間変化および第1スタンドのロールベンダーによるベンド量の時間変化と、第1スタンドの圧延荷重の時間変化、板厚偏差との関係の一例を図2に示す。なお、図2の横軸は時間である。 In the present invention, for example, using a cold rolling mill configured as shown in FIG. 1. The tension on the delivery side of the rolling stand is set to a value lower than that set before deceleration, and the amount of bend by the roll bender is set to a value lower than that set before deceleration, and the strip is rolled under constant thickness control. In this case, the time change of the strip threading speed, the time change of the rolling load of the first stand, the time change of the first stand delivery side tension, the time change of the bending amount by the roll bender of the first stand, and the time change of the first stand FIG. 2 shows an example of the relationship between the change in rolling load over time and the plate thickness deviation. Note that the horizontal axis of FIG. 2 is time.

なお、図2に示す例では、通板速度を300mpm以下に減速した(時間t1)のちに、第1圧延スタンド出側張力、ロールベンダーによるベンド量を減速前に比べてそれぞれ80%に設定(変更)した。通板速度を300mpm以下に減速することにより、圧延荷重は減速前の80%と顕著に低下している。このような圧延を行うことにより、鋼板の幅方向端部に引張応力が集中せず、耳割れの発生も抑制され、また、板厚は目標板厚±10μm以内に抑えることができ、オフゲージの発生も又耳割れによる板破断を抑制できている。 In the example shown in FIG. 2, after the strip threading speed is reduced to 300 mpm or less (time t 1 ), the tension on the delivery side of the first rolling stand and the bend amount by the roll bender are each set to 80% of those before deceleration. (changed. By reducing the strip threading speed to 300 mpm or less, the rolling load is remarkably reduced to 80% of that before deceleration. By performing this type of rolling, tensile stress is not concentrated on the ends of the steel sheet in the width direction, which suppresses the occurrence of edge cracks. In terms of occurrence, plate breakage due to edge cracks can also be suppressed.

一方、通板速度を300mpm以下に減速したのちも、第1圧延スタンド出側張力、ロールベンダーによるベンド量を減速前と同じ値に設定したままとすると、鋼板の幅方向中心部の伸び差率が幅方向端部のそれよりも大きい中伸び状態となるため、鋼板の幅方向端部に引張応力が集中し圧延スタンド出側で耳割れを引き起こす。耳割れが大きくなり最終的に板破断に至る。図3に示す例では、通板速度を減速して圧延荷重が低下したにも関わらず、第1圧延スタンド出側張力およびロールベンダーによるベンド量をいずれも低減させなかったために、耳割れ破断を生じている。 On the other hand, even after the strip threading speed is reduced to 300mpm or less, if the tension on the exit side of the first rolling stand and the bend amount by the roll bender are set to the same values as before deceleration, the elongation difference at the center of the width direction of the steel plate is is larger than that at the widthwise ends, tensile stress concentrates at the widthwise ends of the steel plate, causing edge cracks on the delivery side of the rolling stand. Edge cracks become larger and finally lead to plate breakage. In the example shown in FIG. 3, although the rolling load was reduced by decelerating the strip threading speed, neither the tension on the delivery side of the first rolling stand nor the bend amount by the roll bender was reduced, so edge cracking occurred. is occurring.

なお、低速域の通板速度とする必要がなくなったのちは、減速前の通板速度まで、あるいはそれ以外の通板速度まで加速する。加速し、通板速度が300mpmを超えた(時間t2)のちは、平坦度を適正範囲に維持するために、圧延スタンド出側張力、ロールベンダーによるベンド量を減速前と同じ値、あるいはそれ以外の適正な値に設定(変更)し直すことは、言うまでもない。 After it is no longer necessary to set the sheet threading speed to the low speed range, the sheet threading speed is accelerated to the sheet threading speed before deceleration or to a different sheet threading speed. After the strip threading speed exceeded 300 mpm (time t 2 ), the tension on the exit side of the rolling stand and the bend amount by the roll bender were set to the same values as before deceleration, or more, in order to maintain the flatness within an appropriate range. Needless to say, the setting (change) is performed again to an appropriate value other than the value.

なお、本発明の冷間圧延方法は、溶接点前後の領域の通過に対しては適用するが、溶接点そのものの通過には適用しない。 The cold rolling method of the present invention is applied to the passage of the area before and after the welding point, but not to the passage of the welding point itself.

以下、実施例に基づき、さらに本発明について説明する。 The present invention will be further described below based on examples.

図1に示すような、4段圧延機を2スタンドを備える二次冷間圧延機で、焼鈍済みの薄冷延鋼板(板厚:0.213mm)を被圧延材として、該被圧延材に冷間圧延を施して極薄冷延鋼板(板厚:0.160mm)を得た。ここで、冷間圧延時の通板速度は、当初、800mpmとし、途中で300mpm以下の35mpmまで減速し、鋼板長手方向の5900~6000mmの範囲(溶接点を含まない)を、該35mpmのままの低速度で通板し、板厚一定制御のもとで、第1スタンドで、所定の板厚(0.160mm厚)まで圧延したのち、通板速度を1000mpmまで加速した。なお、第2スタンドでは、調質圧延のみとした。 As shown in FIG. 1, a secondary cold rolling mill equipped with two stands of a 4-high rolling mill uses an annealed thin cold-rolled steel sheet (thickness: 0.213 mm) as a material to be rolled, and cools the material to be rolled. An ultra-thin cold-rolled steel sheet (thickness: 0.160 mm) was obtained by cold rolling. Here, the plate threading speed during cold rolling is initially set to 800 mpm, and is reduced to 35 mpm below 300 mpm in the middle. After rolling to a predetermined thickness (0.160 mm thickness) at the first stand under constant thickness control, the threading speed was accelerated to 1000 mpm. In addition, only temper rolling was performed in the second stand.

なお、通板速度を低速域の300mpm以下に減速した際に、同時に、第1スタンドの圧延スタンド出側張力を減速前の通板速度(高速度域)時の80%まで低くするとともに、第1スタンドにおけるロールベンダーによるベンド量を減速前の80%まで低減した。圧延後の極薄鋼板について、全長にわたり板厚を測定(出側板厚計)し、耳割れ発生の有無について調査した。その結果、板厚偏差も±10μmの範囲内に収まっており、オフゲージの発生もなく、また耳割れの発生も認められなかった。 When the strip threading speed is reduced to 300mpm or less in the low speed range, at the same time, the tension on the delivery side of the rolling stand of the 1st stand is reduced to 80% of the strip threading speed (high speed range) before deceleration. The amount of bending caused by the roll bender in one stand has been reduced to 80% of that before deceleration. The thickness of the ultra-thin steel sheet after rolling was measured over the entire length (delivery side thickness gauge), and the presence or absence of edge cracks was investigated. As a result, the plate thickness deviation was within the range of ±10 μm, and no off-gauge or edge cracks were observed.

なお、通板速度を低速度域の300mpm以下に減速した際(時間t2)に、圧延スタンド出側張力およびロールベンダーによるベンド量を減速前のままとした場合を、本発明の範囲を外れる比較例とした。比較例では、中伸び状態となり、耳割れが発生し、板破断に至った(時間tF)。 When the strip threading speed is reduced to 300 mpm or less in the low speed range (time t 2 ), the case where the tension on the delivery side of the rolling stand and the bend amount by the roll bender remain unchanged before deceleration is outside the scope of the present invention. This was used as a comparative example. In the comparative example, it was in a state of medium elongation, edge cracks occurred, and plate fracture occurred (time t F ).

1 冷間圧延機
2 入側ブライドルロール
3 第1スタンドの4段圧延機
4 第2スタンドの4段圧延機
5 出側ブライドルロール
6 入側板厚計
7 出側板厚計
1 cold rolling mill 2 entry side bridle roll 3 first stand 4-high rolling mill 4 second stand 4-high rolling mill 5 delivery side bridle roll 6 entry side thickness gauge 7 delivery side thickness gauge

Claims (2)

薄鋼板を冷間圧延機を用いて冷間圧延し板厚:0.10~0.25mmの極薄鋼板とする冷間圧延方法において、
通板速度を減速して低速域の通板速度で冷間圧延するに当たり、
前記冷間圧延機の圧延スタンド出側張力およびロールベンダーによるベンド量の少なくとも1つを、前記通板速度を減速する前のそれぞれの値に比べて低く設定して板厚一定制御で圧延することを特徴とする冷間圧延方法。
In the cold rolling method of cold rolling a thin steel plate using a cold rolling mill to make an ultra-thin steel plate with a thickness of 0.10 to 0.25 mm ,
When cold rolling is performed at a low speed by reducing the threading speed,
At least one of the tension on the delivery side of the rolling stand of the cold rolling mill and the bending amount by the roll bender is set lower than the respective values before the strip threading speed is reduced, and the strip is rolled under constant thickness control. A cold rolling method characterized by
前記低速域の通板速度が、300mpm以下であることを特徴とする請求項1に記載の冷間圧延方法。 2. The cold rolling method according to claim 1, wherein the sheet threading speed in the low speed region is 300 mpm or less.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2752589B2 (en) 1994-11-22 1998-05-18 日新製鋼株式会社 Shape control method and apparatus for continuous rolling mill
JP2001269706A (en) 2000-03-27 2001-10-02 Nisshin Steel Co Ltd Method for controlling shape at continuous cold rolling
JP2005161373A (en) 2003-12-03 2005-06-23 Nisshin Steel Co Ltd Method for controlling shape in cold tandem mill
JP2007196271A (en) 2006-01-27 2007-08-09 Nippon Steel Corp Method for suppressing variation of thickness in secondary cold-rolling mill

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5568114A (en) * 1978-11-15 1980-05-22 Kawasaki Steel Corp Controller for rolling work of multistage continuous rolling mill

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2752589B2 (en) 1994-11-22 1998-05-18 日新製鋼株式会社 Shape control method and apparatus for continuous rolling mill
JP2001269706A (en) 2000-03-27 2001-10-02 Nisshin Steel Co Ltd Method for controlling shape at continuous cold rolling
JP2005161373A (en) 2003-12-03 2005-06-23 Nisshin Steel Co Ltd Method for controlling shape in cold tandem mill
JP2007196271A (en) 2006-01-27 2007-08-09 Nippon Steel Corp Method for suppressing variation of thickness in secondary cold-rolling mill

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