JP2006095544A - Steel strip cold-rolling equipment and steel strip cold-rolling method - Google Patents

Steel strip cold-rolling equipment and steel strip cold-rolling method Download PDF

Info

Publication number
JP2006095544A
JP2006095544A JP2004282108A JP2004282108A JP2006095544A JP 2006095544 A JP2006095544 A JP 2006095544A JP 2004282108 A JP2004282108 A JP 2004282108A JP 2004282108 A JP2004282108 A JP 2004282108A JP 2006095544 A JP2006095544 A JP 2006095544A
Authority
JP
Japan
Prior art keywords
steel strip
cold rolling
passes
storage device
temperature
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.)
Pending
Application number
JP2004282108A
Other languages
Japanese (ja)
Inventor
Tomomutsu Ono
智睦 小野
Tetsuya Arakawa
哲矢 荒川
Katsuhiro Takebayashi
克浩 竹林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to JP2004282108A priority Critical patent/JP2006095544A/en
Publication of JP2006095544A publication Critical patent/JP2006095544A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Metal Rolling (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide steel strip cold-rolling equipment and a steel strip cold-rolling method which enable static aging treatment to be sufficiently performed between passes and enable especially an electric steel sheet with suppressed variation in magnetic characteristics in the longitudinal direction of the steel strip to be manufactured while the high productivity of a tandem mill is maintained. <P>SOLUTION: The cold-rolling equipment continuously performs the cold rolling of the steel strip with the use of the tandem mill comprising a plurality of rolling stands, wherein a steel strip storing device for storing a prescribed length of the steel strip is installed in at least one space between the stands. The steel strip cold-rolling method is provided by which the cold-rolling is performed with the use of the above cold-rolling equipment while the static aging treatment of the steel strip between passes is performed when the steel strip is passed through the space between the stands where the steel strip storing device is installed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、鋼帯の冷間圧延設備および鋼帯の冷間圧延方法にかかり、特に鋼帯長さ方向における鋼帯の磁気特性の変動を抑制した電磁鋼帯を製造することができる冷間圧延設備および鋼帯の冷間圧延方法を提供する。   The present invention relates to a steel strip cold rolling facility and a steel strip cold rolling method, and is particularly capable of producing an electromagnetic steel strip that suppresses fluctuations in the magnetic properties of the steel strip in the length direction of the steel strip. A rolling facility and a method for cold rolling a steel strip are provided.

電磁鋼帯の製造方法においては、冷間圧延途中のパス間で、素材に350℃以下の温度で保持する熱処理(以下、時効処理という)を施すことにより、鉄損及び磁束密度等の磁気特性が改善されることが知られている(例えば、特許文献1)。   In the method of manufacturing an electromagnetic steel strip, magnetic properties such as iron loss and magnetic flux density are obtained by performing heat treatment (hereinafter referred to as aging treatment) holding the material at a temperature of 350 ° C. or lower between passes during cold rolling. Is known to be improved (for example, Patent Document 1).

このような鋼帯の製造方法は、C、Nの拡散現象を利用し、冷間圧延途中のパス間で、圧延変形で発生した転位をC、Nによって固着させ、更に、冷間圧延を行って剪断変形により、圧延集合組織を改善する方法である。   Such a steel strip manufacturing method uses the diffusion phenomenon of C and N, fixes dislocations generated by rolling deformation between passes during cold rolling, and further performs cold rolling. Thus, the rolling texture is improved by shear deformation.

しかしこの方法は時効処理に1分以上といった保持時間が必要であるため、生産性の向上に有利なタンデム圧延機による圧延のように、冷間圧延のパス間で十分な保持時間が得られない場合にはC、Nの拡散が十分でなく、磁気特性を改善するのは困難であるとされていた。   However, since this method requires a holding time of 1 minute or more for aging treatment, a sufficient holding time cannot be obtained between passes of cold rolling as in the case of rolling with a tandem rolling mill which is advantageous for improving productivity. In some cases, the diffusion of C and N is insufficient, and it has been difficult to improve the magnetic characteristics.

また他にも、磁気特性向上の手段の一つとして、タンデム圧延機による温間圧延方法が知られている。温間圧延により磁気特性を向上させる圧延方法は、上記のような冷間圧延のパス間で時効処理を行う静的な時効とは異なり、圧延中の鋼帯温度を高温とすることにより、圧延変形で発生した転位を直ちにC、Nによって固着させるという、動的時効の効果を利用した方法である。   In addition, a warm rolling method using a tandem rolling mill is known as one of means for improving magnetic properties. Unlike the static aging method in which the aging treatment is performed between the cold rolling passes as described above, the rolling method for improving the magnetic properties by warm rolling is performed by increasing the steel strip temperature during rolling. This is a method utilizing the effect of dynamic aging in which dislocations generated by deformation are immediately fixed by C and N.

タンデム圧延機による温間圧延方法では、少なくとも1パス以上においてワークロール対に鋼帯がかみこむときの鋼帯温度を300〜500℃としている(特許文献2、3)。
特開昭50−16610号公報 特開1−215925号公報 特開平1−218705号公報
In the warm rolling method using a tandem rolling mill, the steel strip temperature is set to 300 to 500 ° C. when the steel strip is caught in the work roll pair in at least one pass (Patent Documents 2 and 3).
Japanese Patent Laid-Open No. 50-16610 Japanese Patent Laid-Open No. 1-215925 JP-A-1-218705

しかしながらタンデム圧延機による温間圧延方法は、動的時効の効果を発現するための最適鋼帯温度が歪速度に依存するため、タンデム圧延機での生産性を考慮して圧延速度を高めると、最適鋼帯温度が高くなって、圧延加工発熱により動的時効の効果を十分発現する鋼帯温度にするのが困難となる。   However, in the warm rolling method using a tandem rolling mill, since the optimum steel strip temperature for expressing the effect of dynamic aging depends on the strain rate, when considering the productivity in the tandem rolling mill, The optimum steel strip temperature becomes high, and it becomes difficult to achieve a steel strip temperature that sufficiently exhibits the effect of dynamic aging due to heat generated by rolling.

またタンデム圧延機による温間圧延方法は、加工発熱を利用するゆえに、動的時効の効果を十分発現する鋼帯温度に安定してコントロールすることが難しく、電磁鋼板を製造した場合、鋼帯長さ方向における磁気特性のばらつきが避けられなかった。   In addition, the warm rolling method using a tandem rolling mill uses processing heat generation, so it is difficult to stably control the steel strip temperature to fully express the effect of dynamic aging. Variation in magnetic characteristics in the vertical direction was inevitable.

本発明は、上記従来技術の問題を解消することにあり、タンデム圧延機の高生産性を維持しつつ、パス間で十分静的時効処理を行うことができ、特に鋼帯長さ方向における鋼帯の磁気特性の変動を抑制した電磁鋼板を製造することが可能な鋼帯の冷間圧延設備およびその冷間圧延方法を提供することを目的とする。   The present invention is to solve the above-mentioned problems of the prior art, and can maintain a high productivity of a tandem rolling mill while performing a sufficiently static aging treatment between passes, particularly in a steel strip length direction. It is an object of the present invention to provide a steel strip cold rolling facility and a cold rolling method thereof capable of producing a magnetic steel sheet in which fluctuations in the magnetic properties of the strip are suppressed.

本発明者らは、鋭意検討した結果、タンデム圧延機のスタンド間に鋼帯貯留装置を設置することが効果的であるとの知見を得、本発明を成すに至った。   As a result of intensive studies, the present inventors have obtained the knowledge that it is effective to install a steel strip storage device between the stands of a tandem rolling mill, and have come to achieve the present invention.

本発明は、以下のとおりである。
1.鋼帯を複数の圧延スタンドからなるタンデム圧延機で連続して冷間圧延を行う鋼帯の冷間圧延設備であって、少なくとも1つのスタンド間に、所定の長さの鋼帯を貯留する鋼帯貯留装置を設置してなることを特徴とする鋼帯の冷間圧延設備。
2.前記鋼帯貯留装置が鋼帯貯留長さを可変として構成されていることを特徴とする上記1.に記載の鋼帯の冷間圧延設備。
3.前記鋼帯貯留装置が設置されたスタンド間の上流側に、鋼帯温度を検出する温度検出器が配置され、該温度検出器で検出した鋼帯温度と時効処理曲線とに基づいて前記鋼帯貯留装置が設置されたスタンド間を鋼帯が通過するときのパス間時間を決定し、決定されたパス間時間となるように、前記鋼帯貯留装置での鋼帯貯留長さが制御装置により制御されるように構成してなることを特徴とする上記2.に記載の鋼帯の冷間圧延設備。
The present invention is as follows.
1. A steel strip cold rolling facility for continuously cold-rolling a steel strip with a tandem rolling mill composed of a plurality of rolling stands, the steel strip storing a steel strip having a predetermined length between at least one stand. A steel strip cold rolling facility characterized by installing a strip storage device.
2. The steel strip storage device is configured such that the steel strip storage length is variable. Cold rolling equipment for steel strips as described in 1.
3. A temperature detector for detecting a steel strip temperature is disposed upstream of the stands where the steel strip storage device is installed, and the steel strip is detected based on the steel strip temperature detected by the temperature detector and the aging treatment curve. The inter-pass time when the steel strip passes between the stands where the storage devices are installed is determined, and the steel strip storage length in the steel strip storage device is determined by the control device so as to be the determined inter-pass time. 2. It is configured to be controlled. Cold rolling equipment for steel strips as described in 1.

4.上記1.に記載の冷間圧延設備により、冷間圧延を行うに際し、前記鋼帯貯留装置が設置されたスタンド間を鋼帯が通過するときのパス間で鋼帯の静的時効処理を行いつつ、冷間圧延を行うことを特徴とする鋼帯の冷間圧延方法。   4). Above 1. When performing cold rolling with the cold rolling equipment described in 1., the steel strip is subjected to static aging treatment between passes when the steel strip passes between stands on which the steel strip storage device is installed, A method of cold rolling a steel strip characterized by performing hot rolling.

5.上記2.または3.に記載の冷間圧延設備により、冷間圧延を行うに際し、前記鋼帯貯留装置が設置されたスタンド間を鋼帯が通過するときの鋼帯温度に応じて、前記鋼帯貯留装置で貯留する鋼帯の貯留長さを所定の長さに設定し、前記鋼帯貯留装置が設置されたスタンド間を鋼帯が通過するときの鋼帯温度が静的時効を発現させるために必要な温度からずれていた場合、ずれた温度を補償するように、前記鋼帯貯留装置が設置されたスタンド間を鋼帯が通過するときのパス間時間を決定し、決定されたパス間時間となるように、前記鋼帯貯留装置での鋼帯貯留長さを制御して、パス間でそのずれた温度を有する鋼帯長さ方向箇所の静的時効処理を行いつつ、冷間圧延を行うことを特徴とする鋼帯の冷間圧延方法。
6.前記鋼帯貯留装置が設置されたスタンド間の上流側に、鋼帯温度を検出する温度検出器を配置して、該温度検出器で検出した鋼帯温度と時効処理曲線とに基づいて前記鋼帯貯留装置が設置されたスタンド間を鋼帯が通過するときのパス間時間を決定することを特徴とする上記5.に記載の鋼帯の冷間圧延方法。
7.タンデム圧延機で連続して冷間圧延を行う鋼帯を電磁鋼用熱間圧延素材とすることを特徴とする上記4.〜6.のいずれかに記載の鋼帯の冷間圧延方法。
5. 2. Or 3. When cold rolling is performed by the cold rolling facility described in 1., the steel strip storage device stores the steel strip according to the steel strip temperature when the steel strip passes between the stands where the steel strip storage device is installed. The steel strip storage length is set to a predetermined length, and the steel strip temperature when the steel strip passes between the stands on which the steel strip storage device is installed is determined from the temperature necessary for developing static aging. If it is deviated, determine the time between passes when the steel strip passes between the stands where the steel strip storage devices are installed so as to compensate for the deviated temperature, so that the time between passes is determined. The steel strip storage length in the steel strip storage device is controlled, and cold rolling is performed while performing the static aging treatment of the steel strip length direction portion having the shifted temperature between passes. A method for cold rolling steel strips.
6). A temperature detector for detecting the steel strip temperature is disposed upstream of the stands where the steel strip storage device is installed, and the steel strip is detected based on the steel strip temperature detected by the temperature detector and the aging treatment curve. 4. The time between passes when the steel strip passes between the stands where the belt storage device is installed is determined. A method for cold rolling steel strips as described in 1.
7). 3. A steel strip that is continuously cold-rolled by a tandem rolling mill is used as a hot-rolling material for electromagnetic steel. ~ 6. A method for cold rolling a steel strip according to any one of the above.

本発明によれば、少なくとも1つのスタンド間に、所定の長さの鋼帯を貯留する鋼帯貯留装置を設置してなる鋼帯の冷間圧延設備としたから、冷間圧延のパス間で時効処理に必要な時間を十分確保することができるようになり、タンデム圧延機の高生産性を維持しつつ、パス間で十分静的時効処理を行うことができ、特に鋼帯長さ方向における鋼帯の磁気特性の変動を抑制した電磁鋼板を製造することができる。   According to the present invention, the steel strip cold rolling facility is provided with a steel strip storage device for storing a steel strip having a predetermined length between at least one stand. Sufficient time for aging treatment can be secured, and high aging of the tandem rolling mill can be maintained, while sufficient static aging treatment can be performed between passes, especially in the steel strip length direction. It is possible to manufacture an electromagnetic steel sheet that suppresses fluctuations in the magnetic properties of the steel strip.

以下、方向性電磁鋼帯を製造するとして説明する。   Hereinafter, description will be made assuming that a directional electromagnetic steel strip is manufactured.

方向性電磁鋼帯には、優れた磁気特性が要求されるので、磁気特性を十分発現させるには、タンデム圧延機の当該スタンドと、それに続くスタンドでの冷間圧延のパス間で十分時効処理を行う必要がある。前述のとおり冷間圧延のパス間で静的時効処理を行なう場合には、冷間圧延によって生じた転位に、C、Nが拡散して固着することにより、その効果が発現するため、鋼帯温度に応じたパス間時間とすることが重要である。   Directional electrical steel strips are required to have excellent magnetic properties. To fully develop magnetic properties, sufficient aging treatment is performed between the stand of the tandem rolling mill and the subsequent cold rolling pass at the stand. Need to do. As described above, when static aging treatment is performed between cold rolling passes, C and N are diffused and fixed to dislocations generated by cold rolling, so that the effect is exhibited. It is important to set the time between passes according to the temperature.

例えば、図1に示したC元素が所定の転位間距離拡散するのに必要な時間と同様、方向性電磁鋼帯を製造するに際し、冷間圧延のパス間において時効処理に必要な時間は、鋼帯温度に応じて指数関数的に変化する。図1に示した時効処理曲線は、鋼帯における平均転位密度を1010個/cmとし、これにより求めた転位間距離と、表1のとおり与えられているC元素の拡散係数(Smithら,Trans. AIME (1962), vol.224, p105)を用いて、C元素が前記転位間距離を移動するに必要な時間を鋼帯温度毎に算出して得たものである。 For example, similar to the time required for the C element shown in FIG. 1 to diffuse a predetermined distance between dislocations, the time required for the aging treatment between the passes of cold rolling is as follows. It changes exponentially according to the steel strip temperature. The aging treatment curve shown in FIG. 1 shows that the average dislocation density in the steel strip is 10 10 pieces / cm 2 , the distance between dislocations obtained by this, and the diffusion coefficient of C element given in Table 1 (Smith et al. , Trans. AIME (1962), vol.224, p105), the time required for the C element to move the distance between dislocations is calculated for each steel strip temperature.

Figure 2006095544
Figure 2006095544

しかしタンデム圧延機で連続して冷間圧延を行う従来の鋼帯の冷間圧延設備には、鋼帯温度が静的時効を十分発現させる最適温度からずれた際に、鋼帯温度の変化を補償する機能がタンデム圧延機のスタンド間になかった。このため、鋼帯長さ方向に鋼帯の温度変動が発生した場合には、冷間圧延後の鋼帯に対して、常法により、脱炭焼鈍、仕上焼鈍を施して、方向性電磁鋼帯製品を製造した場合、鋼帯長さ方向における鋼帯の磁気特性に変動を生じるという問題があった。   However, conventional steel strip cold rolling equipment, which continuously performs cold rolling with a tandem rolling mill, shows changes in steel strip temperature when the steel strip temperature deviates from the optimum temperature at which static aging is sufficiently developed. There was no function to compensate between the stands of the tandem mill. For this reason, when temperature fluctuation of the steel strip occurs in the length direction of the steel strip, the steel strip after cold rolling is subjected to decarburization annealing and finish annealing by a conventional method, and the directional electromagnetic steel When a strip product is manufactured, there is a problem that the magnetic properties of the steel strip in the length direction of the steel strip vary.

そこで本発明では、鋼帯の冷間圧延設備において、タンデム圧延機の少なくとも一つのスタンド間に所定の長さの鋼帯を貯留する機能(ストレージ機能ともいう)を有した鋼帯貯留装置を設置した。本発明にかかる鋼帯貯留装置を有する鋼帯の冷間圧延設備によれば、タンデム圧延機の高生産性を維持しつつ、パス間で十分静的時効処理を行うことができるから、動的時効の効果を発現させるため、1パス以上においてワークロール対に鋼帯がかみこむときの鋼帯温度を300〜500℃にまで圧延加工発熱により上げる必要がない。   Therefore, in the present invention, a steel strip storage device having a function of storing a steel strip of a predetermined length (also referred to as a storage function) between at least one stand of a tandem rolling mill is installed in a cold rolling facility for the steel strip. did. According to the steel strip cold rolling equipment having the steel strip storage device according to the present invention, the static aging treatment can be sufficiently performed between passes while maintaining high productivity of the tandem rolling mill. In order to express the effect of aging, it is not necessary to raise the steel strip temperature to 300 to 500 ° C. due to heat generated by rolling when the steel strip is bitten into the work roll pair in one pass or more.

例えば、本発明にかかる鋼帯貯留装置を有する鋼帯の冷間圧延設備によれば、3mass%Si電磁鋼用熱間圧延材を素材として用い、磁気特性に優れた方向性電磁鋼帯製品を製造するには、前記鋼帯貯留装置が設置されたスタンド間を鋼帯が通過するときの鋼帯温度を180〜250℃、該鋼帯貯留装置が設置された少なくとも一つのスタンド間におけるパス間時間を3秒以上とすることが好ましい。このように鋼帯貯留装置が設置されたスタンド間を鋼帯が通過するときの鋼帯温度に応じて、鋼帯貯留装置で貯留する鋼帯の貯留長さを所定の長さに設定して、パス間で鋼帯の静的時効処理を行いつつ、冷間圧延を行うことにより、磁気特性に優れた方向性電磁鋼帯製品を製造することができる。   For example, according to the steel strip cold rolling equipment having the steel strip storage device according to the present invention, a hot rolled material for 3 mass% Si electrical steel is used as a material, and a directional electrical steel strip product excellent in magnetic properties is obtained. To manufacture, the steel strip temperature when the steel strip passes between the stands where the steel strip storage device is installed is 180 to 250 ° C., and between the passes between at least one stand where the steel strip storage device is installed. The time is preferably 3 seconds or more. Thus, according to the steel strip temperature when the steel strip passes between the stands where the steel strip storage device is installed, the storage length of the steel strip stored in the steel strip storage device is set to a predetermined length. By performing cold rolling while performing static aging treatment of the steel strip between passes, a directional electromagnetic steel strip product having excellent magnetic properties can be produced.

また本発明では以下に詳述するように、前記した鋼帯貯留装置が鋼帯貯留長さを可変として構成されている鋼帯の冷間圧延設備とすることにより、特に鋼帯長さ方向における鋼帯の磁気特性の変動を抑制するようにした。   Moreover, in the present invention, as described in detail below, the steel strip storage device described above is a steel strip cold rolling facility configured to have a variable steel strip storage length, particularly in the steel strip length direction. The variation of the magnetic properties of the steel strip was suppressed.

図2は、本発明を4スタンドタンデム圧延機に適用した場合の概略構成図である。4スタンドタンデム圧延機は、図示しない第1、第2スタンドを含む、第3、第4スタンドに組み込んだワークロール1により冷間圧延を施し、所望の板厚にまで冷間圧延をすることができるように構成されている。図2中、10は鋼帯Sの圧延方向を示す。11は、第3スタンド、12は第4スタンドをそれぞれ示す。   FIG. 2 is a schematic configuration diagram when the present invention is applied to a 4-stand tandem rolling mill. The 4-stand tandem rolling mill can be cold-rolled to a desired plate thickness by performing cold rolling with the work rolls 1 incorporated in the third and fourth stands, including first and second stands (not shown). It is configured to be able to. In FIG. 2, 10 indicates the rolling direction of the steel strip S. Reference numeral 11 denotes a third stand, and 12 denotes a fourth stand.

鋼帯貯留装置2は、第3スタンド11と第4スタンド12の間に設置されており、昇降装置6を介して昇降ローラ7の高さ方向位置を制御装置5により制御し、昇降ローラ7と固定ローラ8間の距離を変えることにより、鋼帯貯留装置2に貯留する鋼帯Sの長さ、すなわち、鋼帯貯留長さを可変とするように構成されている。   The steel strip storage device 2 is installed between the third stand 11 and the fourth stand 12, and the height direction position of the lifting roller 7 is controlled by the control device 5 via the lifting device 6. By changing the distance between the fixed rollers 8, the length of the steel strip S stored in the steel strip storage device 2, that is, the steel strip storage length is made variable.

なお、制御装置5は、鋼帯貯留装置2での鋼帯貯留長さを制御しているだけではなく、タンデム圧延機を含む冷間圧延設備全体を制御するコンピュータを示す。すなわち、制御装置5は、タンデム圧延機で連続して冷間圧延を行う際に、タンデム圧延機のワークロール回転速度制御を行うことにより、第3スタンド出側の鋼帯速度および第3スタンド入側の鋼帯速度を制御し、また制御装置5により昇降ローラ7の高さ方向位置を制御して、鋼帯貯留装置2での鋼帯貯留長さを変えている。   In addition, the control apparatus 5 shows the computer which controls not only the steel strip storage length in the steel strip storage apparatus 2, but the whole cold rolling equipment including a tandem rolling mill. That is, the control device 5 performs the work roll rotation speed control of the tandem rolling mill when performing continuous cold rolling with the tandem rolling mill, so that the steel strip speed on the third stand exit side and the third stand entering are controlled. The steel strip speed in the steel strip storage device 2 is changed by controlling the steel strip speed on the side and controlling the height direction position of the lifting roller 7 by the control device 5.

この図2に示した鋼帯の冷間圧延設備には、前記鋼帯貯留装置2が設置されたスタンド間の上流側に、鋼帯温度を検出する温度検出器3が配置されて、この温度検出器3で検出した鋼帯温度が時効処理時間演算装置4により入力されている。また、時効処理時間演算装置4は、前記温度検出器3で検出した鋼帯温度と、静的時効を十分発現させる時効処理曲線とに基づいて鋼帯貯留装置2が設置されたスタンド間を鋼帯Sが通過するときのパス間時間を決定し、決定されたパス間時間を制御装置5に送る。鋼帯の冷間圧延設備は、この時効処理時間演算装置4により決定されたパス間時間となるように、鋼帯貯留装置2での鋼帯貯留長さが制御装置5により制御するよう構成されている。   In the cold rolling equipment for the steel strip shown in FIG. 2, a temperature detector 3 for detecting the steel strip temperature is arranged on the upstream side between the stands where the steel strip storage device 2 is installed. The steel strip temperature detected by the detector 3 is input by the aging treatment time calculation device 4. Further, the aging treatment time calculation device 4 has a steel space between the stands where the steel strip storage device 2 is installed based on the steel strip temperature detected by the temperature detector 3 and an aging treatment curve that sufficiently exhibits static aging. The inter-pass time when the band S passes is determined, and the determined inter-pass time is sent to the control device 5. The steel strip cold rolling equipment is configured so that the steel strip storage length in the steel strip storage device 2 is controlled by the control device 5 so that the time between passes determined by the aging treatment time calculation device 4 is reached. ing.

次いで、図2に示した鋼帯の冷間圧延設備の作用を説明する。   Next, the operation of the steel strip cold rolling facility shown in FIG. 2 will be described.

図2に示す鋼帯の冷間圧延設備においては、タンデム圧延機で冷間圧延を行う際に、鋼帯貯留装置2が設置されたスタンド間を鋼帯が通過するときの鋼帯温度に応じて、鋼帯貯留装置2貯留する鋼帯の貯留長さを所定の長さに設定する。そして鋼帯貯留装置2が設置されたスタンド間を鋼帯が通過するときの鋼帯温度が静的時効を発現させるために必要な温度からずれていた場合には、ずれた温度を補償するように、鋼帯貯留装置2が設置されたスタンド間を鋼帯が通過するときのパス間時間を決定し、決定されたパス間時間となるように、鋼帯貯留装置2の鋼帯貯留長さを制御して、パス間でそのずれた温度を有する鋼帯長さ方向箇所の静的時効処理を行いつつ、鋼帯の冷間圧延を行う。   In the cold rolling equipment of the steel strip shown in FIG. 2, when cold rolling is performed with a tandem rolling mill, depending on the steel strip temperature when the steel strip passes between the stands where the steel strip storage device 2 is installed. Then, the storage length of the steel strip stored in the steel strip storage device 2 is set to a predetermined length. And when the steel strip temperature when the steel strip passes between the stands where the steel strip storage device 2 is installed is deviated from the temperature necessary for expressing the static aging, the compensated temperature is compensated. In addition, the inter-pass time when the steel strip passes between the stands where the steel strip storage device 2 is installed is determined, and the steel strip storage length of the steel strip storage device 2 is set so as to be the determined inter-pass time. The steel strip is cold-rolled while performing static aging treatment of the steel strip length direction portion having the temperature shifted between passes.

例えば、図1に示される曲線を静的時効を発現させる時効処理曲線として具体的に、鋼帯貯留装置2が設置されたスタンド間を鋼帯Sが通過するときのパス間時間を決定する手順を説明する。   For example, the procedure shown in FIG. 1 is a procedure for determining the time between passes when the steel strip S passes between the stands where the steel strip storage device 2 is installed, specifically as an aging treatment curve for expressing static aging. Will be explained.

但し、鋼帯貯留装置2が設置されたスタンド間で十分静的時効を発現させるための鋼帯温度を250℃、時効処理に必要な時間を1秒とし、温度検出器3で検出した鋼帯温度が250℃からΔTだけ低かったとする。この場合には、その鋼帯温度を検出した鋼帯長さ方向箇所での鋼帯温度の変化ΔTを補償し、静的時効を発現させるために必要な時間は、図1に示される時効処理曲線から(1+Δτ)秒と決定される。この場合、鋼帯温度が250℃の箇所に対してΔTだけ低い箇所が通過するときのパス間時間を1秒よりΔτ秒だけ長くなるように、制御装置5により鋼帯貯留装置2での鋼帯貯留長さを変える。   However, the temperature of the steel strip detected by the temperature detector 3 is 250 ° C., and the time required for the aging treatment is 1 second for sufficient static aging between the stands where the steel strip storage device 2 is installed. It is assumed that the temperature is lower than 250 ° C. by ΔT. In this case, the time required for compensating for the change ΔT in the steel strip temperature at the location in the length direction of the steel strip where the steel strip temperature is detected and for expressing the static aging is the aging treatment shown in FIG. (1 + Δτ) seconds is determined from the curve. In this case, the steel in the steel strip storage device 2 is controlled by the control device 5 so that the time between passes when a portion lower by ΔT passes the portion where the steel strip temperature is 250 ° C. is longer than 1 second by Δτ seconds. Change the belt storage length.

一方、前記とは反対に、温度検出器3で検出した鋼帯長さ方向箇所での鋼帯温度が250℃より高かった場合には、図1に示される時効処理曲線から、鋼帯温度が250℃より高い鋼帯長さ方向箇所での鋼帯温度の変化を補償し、静的時効を発現させるために必要な時間は、鋼帯温度が250℃の鋼帯長さ方向箇所の1秒より短い時間と決定される。この場合、鋼帯温度が250℃に対して高い箇所が通過するときのパス間時間を1秒より短くなるように、制御装置5により鋼帯貯留装置2での鋼帯貯留長さを変える。   On the other hand, when the steel strip temperature at the location in the steel strip length direction detected by the temperature detector 3 is higher than 250 ° C., the steel strip temperature is determined from the aging treatment curve shown in FIG. The time required to compensate for changes in the steel strip temperature at locations higher than 250 ° C and to develop static aging is 1 second in the location in the length direction of the steel strip at 250 ° C. Decided to be shorter. In this case, the steel strip storage length in the steel strip storage device 2 is changed by the control device 5 so that the time between passes when a portion where the steel strip temperature is higher than 250 ° C. passes is shorter than 1 second.

したがって、図2に示したような鋼帯の冷間圧延設備によれば、タンデム圧延機の高生産性を維持しつつ、パス間で十分静的時効処理を行うことができ、特に鋼帯長さ方向における磁気特性の変動を抑制することができる。   Therefore, according to the cold rolling equipment for steel strip as shown in FIG. 2, it is possible to sufficiently perform static aging treatment between passes while maintaining the high productivity of the tandem rolling mill. Variations in magnetic characteristics in the vertical direction can be suppressed.

その際、鋼帯貯留装置2が設置されたスタンド間の上流側に、鋼帯温度を検出する温度検出器3を配置して、温度検出器3で検出した鋼帯温度と時効処理曲線とに基づいて鋼帯貯留装置2が設置されたスタンド間を鋼帯が通過するときのパス間時間を決定することが、正確にパス間時間を決定することができるので好ましい。   In that case, the temperature detector 3 which detects steel strip temperature is arrange | positioned in the upstream between the stands in which the steel strip storage apparatus 2 was installed, and the steel strip temperature detected with the temperature detector 3 and an aging treatment curve are used. Based on this, it is preferable to determine the time between passes when the steel strip passes between the stands on which the steel strip storage devices 2 are installed, because the time between passes can be accurately determined.

ここで、鋼帯貯留装置2が設置されたスタンド間を鋼帯が通過するときの鋼帯温度が静的時効を発現させるための鋼帯温度からずれていた場合に、鋼帯貯留装置2におけるストレージ長を変化させるには、第3スタンド出側の鋼帯速度と第4スタンド入側の鋼帯速度に速度差を生じさせればよい。すなわち、鋼帯貯留装置2におけるストレージ長を増やすには、第3スタンド出側の鋼帯速度を第4スタンド入側の鋼帯速度より早めればよいし、反対に、鋼帯貯留装置2におけるストレージ長を減らすには、第3スタンド出側の鋼帯速度を第4スタンド入側の鋼帯速度より遅くすれば達成することができる。   Here, when the steel strip temperature when the steel strip passes between the stands where the steel strip storage device 2 is installed deviates from the steel strip temperature for causing static aging, in the steel strip storage device 2 In order to change the storage length, a speed difference may be generated between the steel strip speed on the third stand exit side and the steel strip speed on the fourth stand entrance side. That is, in order to increase the storage length in the steel strip storage device 2, the steel strip speed on the third stand exit side may be made faster than the steel strip speed on the fourth stand entry side. To reduce the storage length, the steel strip speed on the third stand exit side can be achieved by making it slower than the steel strip speed on the fourth stand entrance side.

なお、鋼帯貯留装置2におけるストレージ長を変化させているときには、第3スタンド出側の鋼帯速度と、第4スタンド入側の鋼帯速度とが相違するので、鋼帯長さ方向所定箇所での温度変化を補償するための、鋼帯貯留装置2におけるストレージ長は、スタンド出側の鋼帯速度と、第4スタンド入側の鋼帯速度との両方を勘案して求める。   In addition, when changing the storage length in the steel strip storage device 2, the steel strip speed on the third stand exit side and the steel strip speed on the fourth stand entrance side are different. The storage length in the steel strip storage device 2 for compensating for the temperature change at is obtained in consideration of both the steel strip speed on the stand exit side and the steel strip speed on the fourth stand entry side.

その際、第3スタンド出側の鋼帯速度およびスタンド入側の鋼帯速度には、図示しない速度計による実測値を用いることができる。あるいは、第3スタンド出側の鋼帯速度およびスタンド入側の鋼帯速度には、先進率、後進率といった圧延パラメータと、第3スタンドに組み込んだワークロール1、第4スタンドに組み込んだワークロール1の回転速度に基づいて求めた計算値を用いることができる。   In that case, the measured value by the speedometer which is not shown in figure can be used for the steel strip speed on the 3rd stand exit side, and the steel strip speed on the stand entrance side. Alternatively, the steel strip speed on the third stand exit side and the steel strip speed on the stand entrance side include rolling parameters such as the advance rate and the reverse travel rate, the work roll 1 incorporated in the third stand, and the work roll incorporated in the fourth stand. A calculated value obtained based on the rotation speed of 1 can be used.

上述した鋼帯の冷間圧延設備により、冷間圧延を行う方法は、方向性電磁鋼帯を製造することに限定されず、各種鋼帯を製造する際に適用することができる。また鋼帯貯留装置2を設置するタンデム圧延機のスタンド数は特に限定されない。   The method of performing cold rolling by the cold rolling equipment for the steel strip described above is not limited to manufacturing a directional electromagnetic steel strip, and can be applied when manufacturing various steel strips. Moreover, the number of stands of the tandem rolling mill in which the steel strip storage device 2 is installed is not particularly limited.

4スタンドタンデム圧延機の第3スタンドと第4スタンド間に第2図に示した構成の鋼帯貯留装置2を設置し、冷間圧延を行った。3mass%Si熱間圧延材を素材として用い、第3スタンド出側での鋼板温度の目標値を250℃とし、第1〜第3スタンドでのクーラント流量を行った。そして、温度検出器3により検出した鋼帯温度と十分静的時効を発現させることができる時効処理曲線とに基づいて、鋼帯貯留装置2が設置されたスタンド間を鋼帯Sが通過するときの鋼帯温度が静的時効を発現させるための温度からずれていた場合、その鋼帯長さ方向箇所での温度変化を補償するように、パス間時間を時効処理時間演算装置4により決定し、決定されたパス間時間となるように、鋼帯貯留装置2の鋼帯貯留長さを制御装置5により制御して、パス間でそのずれた温度を有する鋼帯長さ方向箇所の静的時効処理を行いつつ、鋼帯の冷間圧延を行った。
その後、得られた冷間圧延板に対して、常法により、脱炭焼鈍、仕上焼鈍を施して、方向性電磁鋼板製品を得て、鉄損特性(W17/50)を測定した。
The steel strip storage device 2 having the configuration shown in FIG. 2 was installed between the third stand and the fourth stand of the 4-stand tandem rolling mill, and cold rolling was performed. A 3 mass% Si hot-rolled material was used as a raw material, and the target value of the steel plate temperature on the third stand outlet side was 250 ° C., and the coolant flow rate in the first to third stands was performed. And, when the steel strip S passes between the stands where the steel strip storage device 2 is installed, based on the steel strip temperature detected by the temperature detector 3 and the aging treatment curve capable of sufficiently expressing static aging. When the steel strip temperature is deviated from the temperature for static aging, the inter-pass time is determined by the aging treatment time calculation device 4 so as to compensate for the temperature change at the location in the steel strip length direction. The steel strip storage length of the steel strip storage device 2 is controlled by the control device 5 so that the determined inter-pass time is reached, and the steel strip length direction static part having the temperature shifted between passes is static. While performing an aging treatment, the steel strip was cold-rolled.
Thereafter, the obtained cold-rolled sheet was subjected to decarburization annealing and finish annealing by a conventional method to obtain a grain-oriented electrical steel sheet product, and the iron loss characteristics (W17 / 50) were measured.

その結果、従来の方法では、鉄損特性が所定の合格レベルに達しない品質不良部分の圧延方向長さが全コイル長の約30%に亘ったのに対して、本発明の方法では、品質不良部分の長さが10%未満と著しく改善され、タンデム圧延による生産性の高さを十分に発揮させることが可能となった。   As a result, in the conventional method, the length in the rolling direction of the defective portion where the iron loss characteristic does not reach the predetermined acceptable level is about 30% of the total coil length, whereas in the method of the present invention, the quality is reduced. The length of the defective portion was remarkably improved to be less than 10%, and it was possible to sufficiently exhibit the high productivity by tandem rolling.

時効処理曲線を説明するためのグラフである。It is a graph for demonstrating an aging treatment curve. 本発明を4スタンドタンデム圧延機に適用した場合の概略構成図である。It is a schematic block diagram at the time of applying this invention to a 4 stand tandem rolling mill.

符号の説明Explanation of symbols

S 鋼帯
1 ワークロール
2 鋼帯貯留装置
3 温度検出器
4 時効処理時間演算装置
5 制御装置
6 昇降装置
7 昇降ローラ
8 固定ローラ
10 鋼帯Sの圧延方向
11 第3スタンド
12 第4スタンド
DESCRIPTION OF SYMBOLS S Steel strip 1 Work roll 2 Steel strip storage device 3 Temperature detector 4 Aging processing time calculating device 5 Control device 6 Lifting device 7 Lifting roller 8 Fixed roller 10 Rolling direction of steel strip S 11 3rd stand 12 4th stand

Claims (7)

鋼帯を複数の圧延スタンドからなるタンデム圧延機で連続して冷間圧延を行う鋼帯の冷間圧延設備であって、少なくとも1つのスタンド間に、所定の長さの鋼帯を貯留する鋼帯貯留装置を設置してなることを特徴とする鋼帯の冷間圧延設備。   A steel strip cold rolling facility for continuously cold-rolling a steel strip with a tandem rolling mill composed of a plurality of rolling stands, the steel strip storing a steel strip having a predetermined length between at least one stand. A steel strip cold rolling facility characterized by installing a strip storage device. 前記鋼帯貯留装置が鋼帯貯留長さを可変として構成されていることを特徴とする請求項1に記載の鋼帯の冷間圧延設備。   The steel strip cold rolling facility according to claim 1, wherein the steel strip storage device is configured to have a variable steel strip storage length. 前記鋼帯貯留装置が設置されたスタンド間の上流側に、鋼帯温度を検出する温度検出器が配置され、該温度検出器で検出した鋼帯温度と時効処理曲線とに基づいて前記鋼帯貯留装置が設置されたスタンド間を鋼帯が通過するときのパス間時間を決定し、決定されたパス間時間となるように、前記鋼帯貯留装置での鋼帯貯留長さが制御装置により制御されるように構成してなることを特徴とする請求項2に記載の鋼帯の冷間圧延設備。   A temperature detector for detecting a steel strip temperature is disposed upstream of the stands where the steel strip storage device is installed, and the steel strip is detected based on the steel strip temperature detected by the temperature detector and the aging treatment curve. The inter-pass time when the steel strip passes between the stands where the storage devices are installed is determined, and the steel strip storage length in the steel strip storage device is determined by the control device so as to be the determined inter-pass time. The steel strip cold rolling facility according to claim 2, wherein the steel strip cold rolling facility is configured to be controlled. 請求項1に記載の冷間圧延設備により、冷間圧延を行うに際し、前記鋼帯貯留装置が設置されたスタンド間を鋼帯が通過するときのパス間で鋼帯の静的時効処理を行いつつ、冷間圧延を行うことを特徴とする鋼帯の冷間圧延方法。   When cold rolling is performed by the cold rolling facility according to claim 1, static aging treatment of the steel strip is performed between passes when the steel strip passes between the stands where the steel strip storage device is installed. A method of cold rolling a steel strip, characterized in that cold rolling is performed. 請求項2または3に記載の冷間圧延設備により、冷間圧延を行うに際し、前記鋼帯貯留装置が設置されたスタンド間を鋼帯が通過するときの鋼帯温度に応じて、前記鋼帯貯留装置で貯留する鋼帯の貯留長さを所定の長さに設定し、前記鋼帯貯留装置が設置されたスタンド間を鋼帯が通過するときの鋼帯温度が静的時効を発現させるために必要な温度からずれていた場合、ずれた温度を補償するように、前記鋼帯貯留装置が設置されたスタンド間を鋼帯が通過するときのパス間時間を決定し、決定されたパス間時間となるように、前記鋼帯貯留装置での鋼帯貯留長さを制御して、パス間でそのずれた温度を有する鋼帯長さ方向箇所の静的時効処理を行いつつ、冷間圧延を行うことを特徴とする鋼帯の冷間圧延方法。   When cold rolling is performed by the cold rolling equipment according to claim 2 or 3, the steel strip according to a steel strip temperature when the steel strip passes between stands on which the steel strip storage device is installed. In order to set the storage length of the steel strip stored in the storage device to a predetermined length, and the steel strip temperature when the steel strip passes between the stands where the steel strip storage device is installed exhibits static aging In order to compensate for the deviated temperature, the time between the passes when the steel strip passes between the stands where the steel strip storage device is installed is determined, and the distance between the determined passes is determined. Cold rolling while controlling the steel strip storage length in the steel strip storage device and performing static aging treatment of the steel strip length direction location having the temperature shifted between passes so as to be time A method of cold rolling a steel strip characterized in that 前記鋼帯貯留装置が設置されたスタンド間の上流側に、鋼帯温度を検出する温度検出器を配置して、該温度検出器で検出した鋼帯温度と時効処理曲線とに基づいて前記鋼帯貯留装置が設置されたスタンド間を鋼帯が通過するときのパス間時間を決定することを特徴とする請求項5に記載の鋼帯の冷間圧延方法。   A temperature detector for detecting the steel strip temperature is arranged upstream of the stands where the steel strip storage device is installed, and the steel strip is detected based on the steel strip temperature detected by the temperature detector and the aging treatment curve. 6. The method of cold rolling steel strip according to claim 5, wherein a time between passes when the steel strip passes between stands on which the strip storage device is installed is determined. タンデム圧延機で連続して冷間圧延を行う鋼帯を電磁鋼用熱間圧延素材とすることを特徴とする請求項4〜6のいずれかに記載の鋼帯の冷間圧延方法。   The steel strip cold rolling method according to any one of claims 4 to 6, wherein a steel strip that is continuously cold rolled by a tandem rolling mill is used as a hot rolled material for electromagnetic steel.
JP2004282108A 2004-09-28 2004-09-28 Steel strip cold-rolling equipment and steel strip cold-rolling method Pending JP2006095544A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004282108A JP2006095544A (en) 2004-09-28 2004-09-28 Steel strip cold-rolling equipment and steel strip cold-rolling method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004282108A JP2006095544A (en) 2004-09-28 2004-09-28 Steel strip cold-rolling equipment and steel strip cold-rolling method

Publications (1)

Publication Number Publication Date
JP2006095544A true JP2006095544A (en) 2006-04-13

Family

ID=36235854

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004282108A Pending JP2006095544A (en) 2004-09-28 2004-09-28 Steel strip cold-rolling equipment and steel strip cold-rolling method

Country Status (1)

Country Link
JP (1) JP2006095544A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014173103A (en) * 2013-03-06 2014-09-22 Jfe Steel Corp Method of producing grain-oriented magnetic steel sheet
WO2020067236A1 (en) * 2018-09-28 2020-04-02 Jfeスチール株式会社 Method for producing grain-oriented electromagnetic steel sheet, and cold rolling equipment

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014173103A (en) * 2013-03-06 2014-09-22 Jfe Steel Corp Method of producing grain-oriented magnetic steel sheet
WO2020067236A1 (en) * 2018-09-28 2020-04-02 Jfeスチール株式会社 Method for producing grain-oriented electromagnetic steel sheet, and cold rolling equipment
KR20210042368A (en) * 2018-09-28 2021-04-19 제이에프이 스틸 가부시키가이샤 Method for manufacturing grain-oriented electrical steel sheet and cold rolling equipment
CN112752623A (en) * 2018-09-28 2021-05-04 杰富意钢铁株式会社 Method for producing grain-oriented electromagnetic steel sheet and cold rolling facility
EP3854891A4 (en) * 2018-09-28 2021-07-28 JFE Steel Corporation Method for producing grain-oriented electromagnetic steel sheet, and cold rolling equipment
RU2769149C1 (en) * 2018-09-28 2022-03-28 ДжФЕ СТИЛ КОРПОРЕЙШН Method of making sheet from textured electrical steel and cold rolling mill
KR102503902B1 (en) 2018-09-28 2023-02-27 제이에프이 스틸 가부시키가이샤 Method for producing grain-oriented electrical steel sheet and cold-rolling facility

Similar Documents

Publication Publication Date Title
KR101185597B1 (en) Method of continuous annealing for steel strip with curie point and continuous annealing apparatus therefor
CN104511484B (en) The micro-middle wave board-shape control method of a kind of hot-strip
AU760833B2 (en) Metal plate flatness controlling method and device
RU2268098C2 (en) Method for making thin flat articles and plant for performing the same
TWI261000B (en) Hot rolling method and apparatus for steel strip
JP5293022B2 (en) Temperature control method in continuous annealing furnace and continuous annealing furnace
JP4709628B2 (en) Cold rolled steel sheet manufacturing method
JP5217543B2 (en) Continuous annealing method and continuous annealing equipment for steel strip with Curie point
JP2008255422A (en) Method and facility for continuous annealing of steel strip having curie point
JP6721135B1 (en) Method for producing grain-oriented electrical steel sheet and cold rolling equipment
JP2006095544A (en) Steel strip cold-rolling equipment and steel strip cold-rolling method
JP2006055884A (en) Method for manufacturing hot-rolled steel sheet and apparatus for controlling rolling
JP3979023B2 (en) Manufacturing method of high strength cold-rolled steel sheet
JP2016107280A (en) Shape control method and shape control device for metal strip
JP6524716B2 (en) Method of manufacturing hot rolled steel sheet excellent in workability
JP2018047483A (en) Shape control method of metal strip and shape control device
JP2009221577A (en) Method of continuously annealing steel strip having curie point and continuous annealing apparatus therefor
JP2005169454A (en) Steel strip manufacturing equipment and method
JP2020015947A (en) Method for manufacturing hot-rolled coil and method for manufacturing non-oriented electromagnetic steel sheet
JP3087639B2 (en) Manufacturing method of high hardness austenitic stainless steel sheet
JP2018034169A (en) Shape correction method of steel sheet, and shape correction device
JP2001137943A (en) Method and device for controlling flatness of metallic sheet
JP2004090065A (en) Heavy reduction rolling method and method for manufacturing hot-rolled steel strip by using the same
EP4159336A1 (en) Grain-oriented electromagnetic steel sheet production method and equipment line
JP4964061B2 (en) Control method for steel wire rod cooling