JP4853000B2 - Hot rolling method and hot rolling equipment used therefor - Google Patents

Hot rolling method and hot rolling equipment used therefor Download PDF

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JP4853000B2
JP4853000B2 JP2005341323A JP2005341323A JP4853000B2 JP 4853000 B2 JP4853000 B2 JP 4853000B2 JP 2005341323 A JP2005341323 A JP 2005341323A JP 2005341323 A JP2005341323 A JP 2005341323A JP 4853000 B2 JP4853000 B2 JP 4853000B2
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hot rolling
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JP2007098468A (en
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昭博 奥野
直人 平田
展也 池田
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JFE Steel Corp
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本発明は、熱間圧延方法およびそれ用い熱間圧延設備に関するものである。 The present invention relates to a hot rolling method and hot-rolling facility Ru use therein.

例えば、厚板圧延においては、圧延途中で制御圧延(Controlled Rolling;CR)を施すことにより、優れた材質の鋼材を造り込んでいる。   For example, in thick plate rolling, an excellent steel material is built by performing controlled rolling (CR) during rolling.

その際に、制御圧延を行う時の温度(制御圧延開始温度)が低くかつ制御圧延を行う時の板厚(制御圧延開始板厚)が厚い場合には、圧延材が制御圧延開始温度になるまでにかなりの時間を要するため、熱間圧延(可逆式熱間圧延機)近傍の搬送テーブル上で制御圧延開始温度になるまで圧延材を待機させていた。その結果、その冷却待ちによって熱間圧延機に空き時間が発生し、圧延能率が阻害されるという問題が生じていた。   At that time, when the temperature at the time of controlled rolling (controlled rolling start temperature) is low and the plate thickness at the time of controlled rolling (controlled rolling start plate thickness) is thick, the rolled material becomes the controlled rolling start temperature. Since a considerable amount of time is required, the rolled material is kept on standby until the controlled rolling start temperature is reached on the conveyance table in the vicinity of hot rolling (reversible hot rolling mill). As a result, there is a problem that idle time is generated in the hot rolling mill due to the waiting for cooling, and the rolling efficiency is hindered.

このような冷却待ちによって熱間圧延機に空き時間が発生し圧延能率が阻害されるのを回避するために、例えば、特許文献1には、熱間圧延ラインの仕上圧延機入側において、搬送テーブル上の高温の圧延材を次の圧延材が通過できる高さに持ち上げて待機状態に保持する片持ちフォーク状のアームを有する昇降装置を備えた圧延材の待機装置が開示されている。
特開平4−274814号公報
In order to avoid that the idle time is generated in the hot rolling mill due to such cooling waiting and the rolling efficiency is hindered, for example, in Patent Document 1, transport is performed on the finishing rolling mill entrance side of the hot rolling line. There is disclosed a standby apparatus for a rolled material including a lifting device having a cantilevered fork-like arm that lifts a hot rolled material on a table to a height that allows the next rolled material to pass through and holds it in a standby state.
JP-A-4-274814

しかし、前記特許文献1には、待機装置を用いて追い越し圧延を行うことができることが示唆されているが、冷却待ちを要する制御圧延材が含まれている場合に、どのように圧延を行えば、熱間圧延機の空き時間を低減して、圧延能率を向上させることができるかについては示されていない。   However, although it has been suggested in Patent Document 1 that overtaking rolling can be performed using a standby device, if a controlled rolling material that requires waiting for cooling is included, how to perform rolling? It is not shown whether the rolling mill efficiency can be improved by reducing the idle time of the hot rolling mill.

本発明は、上記のような事情に鑑みてなされたものであり、冷却待ちを要する制御圧延材が含まれている場合でも、熱間圧延機の空き時間を低減して、圧延能率を向上させることができる熱間圧延方法およびそれ用い熱間圧延設備を提供することを目的とするものである。 The present invention has been made in view of the circumstances as described above, and reduces the idle time of the hot rolling mill and improves the rolling efficiency even when the control rolled material that needs to be cooled is included. it it is an object to provide a hot rolling method and hot-rolling facility Ru using it can.

上記の課題を解決するために、本発明は以下の特徴を有する。   In order to solve the above problems, the present invention has the following features.

[1]可逆式熱間圧延機の上流側に、圧延材を搬送テーブル上から上方に持ち上げて後続の圧延材が通過できる場所に待機させるための待機装置としての保持装置を備え、可逆式熱間圧延機の下流側に、搬送テーブル上の圧延材を冷却するための冷却装置を備えた熱間圧延設備を用いた熱間圧延方法であって、
第1のスラブを前記可逆式熱間圧延機にて所定板厚まで圧延後、前記冷却装置によって制御圧延可能な温度まで冷却すると同時に、この冷却中に第2のスラブを前記可逆式熱間圧延機にて所定板厚まで圧延し、圧延後、前記待機装置としての保持装置によって制御圧延可能な温度まで保持して冷却すると同時に、前記第1のスラブを前記可逆式熱間圧延機に逆送して仕上板厚に圧延を行い、さらに、第3のスラブを前記可逆式熱間圧延機に送って仕上板厚まで圧延し、圧延終了後、前記第2のスラブを前記可逆式熱間圧延機に送って仕上板厚まで圧延を行うことを特徴とする熱間圧延方法。
[1] A reversible heat rolling mill is provided on the upstream side of the reversible hot rolling mill with a holding device as a standby device for lifting the rolled material upward from the transfer table and waiting in a place where the subsequent rolled material can pass. It is a hot rolling method using a hot rolling facility equipped with a cooling device for cooling the rolled material on the conveyance table on the downstream side of the rolling mill,
The first slab is rolled to a predetermined plate thickness by the reversible hot rolling mill and then cooled to a temperature at which control rolling is possible by the cooling device. At the same time, the second slab is cooled by the reversible hot rolling. After rolling, the first slab is fed back to the reversible hot rolling mill at the same time as it is cooled to a temperature that can be controlled and rolled by the holding device as the standby device. Then, rolling to the finished sheet thickness is performed, and the third slab is sent to the reversible hot rolling mill to be rolled to the finished sheet thickness. After the rolling is completed, the second slab is rolled to the reversible hot rolling. A hot rolling method characterized by feeding to a machine and rolling to a finished plate thickness.

[2]前記[1]に記載の熱間圧延方法に用いる熱間圧延設備であって、
可逆式熱間圧延機の上流側に、圧延材を搬送テーブル上から上方に持ち上げて後続の圧延材が通過できる場所に待機させるための待機装置としての保持装置を備え、可逆式熱間圧延機の下流側に、搬送テーブル上の圧延材を冷却するための冷却装置を備えたことを特徴とする熱間圧延設備。
[2] A hot rolling facility used in the hot rolling method according to [1],
A reversible hot rolling mill equipped with a holding device as a standby device for lifting the rolled material upward from the transfer table and waiting in a place where the subsequent rolled material can pass on the upstream side of the reversible hot rolling mill. A hot rolling facility comprising a cooling device for cooling the rolled material on the conveying table on the downstream side.

本発明においては、冷却待ちを要する制御圧延材が含まれている場合に、冷却装置による冷却と、待機装置を用いた追い越し圧延を適切に組み合わせることができるようにしているので、熱間圧延機の空き時間を低減して、圧延される圧延材本数を増加させることができ、圧延能率を向上させることができる。   In the present invention, when a control rolled material that requires waiting for cooling is included, the cooling by the cooling device and the overtaking rolling using the standby device can be appropriately combined. The idle time can be reduced, the number of rolled materials to be rolled can be increased, and the rolling efficiency can be improved.

本発明の実施形態を図面に基づいて説明する。   Embodiments of the present invention will be described with reference to the drawings.

図1は、本発明の一実施形態に係る熱間圧延設備のレイアウトと、その熱間圧延設備を用いた熱間圧延方法の手順を示す図である。図1において、1は加熱炉、2は待機装置としての保持装置、3は可逆式熱間圧延機、4は水冷装置である。   FIG. 1 is a diagram showing a layout of a hot rolling facility according to an embodiment of the present invention and a procedure of a hot rolling method using the hot rolling facility. In FIG. 1, 1 is a heating furnace, 2 is a holding device as a standby device, 3 is a reversible hot rolling mill, and 4 is a water cooling device.

ここで、保持装置2は、可逆式熱間圧延機3の上流側に設けられ、高温の圧延材を搬送テーブル上から後続の圧延材が通過できる高さに持ち上げて保持し、所定温度になるまで待機させるためのものである。また、水冷装置4は、可逆式熱間圧延機3の下流側に設けられ、高温の圧延材を所定の温度まで冷却するためのものである。   Here, the holding device 2 is provided on the upstream side of the reversible hot rolling mill 3 and holds the high-temperature rolled material by lifting it from the conveying table to a height at which the subsequent rolled material can pass, and reaches a predetermined temperature. It is for making it wait until. Moreover, the water cooling device 4 is provided in the downstream of the reversible hot rolling mill 3, and is for cooling a hot rolling material to predetermined temperature.

なお、可逆式熱間圧延機3において制御圧延材を圧延する際に、スラブ厚から制御圧延開始板厚までの圧延を粗圧延と呼び、制御圧延開始板厚から仕上板厚(仕上圧延後の板厚)までの圧延を仕上圧延と呼ぶことにする。   In addition, when rolling the control rolling material in the reversible hot rolling mill 3, the rolling from the slab thickness to the control rolling start plate thickness is called rough rolling, and the control rolling start plate thickness to the finishing plate thickness (after the finish rolling) The rolling up to (sheet thickness) is called finish rolling.

そして、これらの熱間圧延設備を利用して、2枚の制御圧延材(第1のスラブA、第2のスラブB)と1枚の通常圧延材(第3のスラブC)の圧延を行う場合には以下のような(1)〜(6)の手順で行う。ここで、制御圧延材は冷却待ちを要する鋼材の例として上げたものであり、通常圧延材は冷却待ちを要しない鋼材の例として上げたものである。   Then, using these hot rolling facilities, two control rolled materials (first slab A, second slab B) and one normal rolled material (third slab C) are rolled. In this case, the following steps (1) to (6) are performed. Here, the control rolled material is an example of a steel material that needs to wait for cooling, and the normal rolled material is an example of a steel material that does not need to wait for cooling.

(1)加熱炉1から抽出された第1のスラブAは、搬送テーブル上を搬送され、保持装置2をそのまま通過して可逆式熱間圧延機3へ送られる。そして、可逆式熱間圧延機3で粗圧延を行う。   (1) The first slab A extracted from the heating furnace 1 is transported on the transport table, passes through the holding device 2 as it is, and is sent to the reversible hot rolling mill 3. Then, rough rolling is performed by the reversible hot rolling mill 3.

(2)続いて、可逆式熱間圧延機3での第1のスラブAの粗圧延の進行とほぼ同期して、第2のスラブBが加熱炉1から抽出されて、保持装置2をそのまま通過して第1のスラブAの粗圧延が終了する頃に可逆式熱間圧延機3に到着する。粗圧延が終了した第1のスラブAは水冷装置4に送られ、仕上圧延に適当な所定の温度域まで温度調整冷却される。この間第2のスラブBは可逆式熱間圧延機3で粗圧延される。   (2) Subsequently, in synchronism with the progress of the rough rolling of the first slab A in the reversible hot rolling mill 3, the second slab B is extracted from the heating furnace 1, and the holding device 2 is left as it is. It passes through and reaches the reversible hot rolling mill 3 when the rough rolling of the first slab A is completed. The first slab A after the rough rolling is sent to the water cooling device 4 and is temperature-controlled and cooled to a predetermined temperature range suitable for finish rolling. Meanwhile, the second slab B is roughly rolled by the reversible hot rolling mill 3.

(3)そして、第2のスラブBの粗圧延が終了すると、この第2のスラブBは保持装置2に送られ、搬送テーブル上から持ち上げられて、制御圧延可能な温度までの温度調整冷却が開始される。このとき、第1のスラブAは水冷装置4での温度調整冷却が終了し、逆送されて可逆式熱間圧延機3で仕上圧延される。   (3) Then, when the rough rolling of the second slab B is completed, the second slab B is sent to the holding device 2 and lifted from the transfer table, and temperature-controlled cooling to a temperature at which control rolling is possible is performed. Be started. At this time, the temperature adjustment cooling in the water cooling device 4 is completed for the first slab A, and the first slab A is fed back and finish-rolled in the reversible hot rolling mill 3.

(4)そして、第1のスラブAの仕上圧延が終了すると、第1のスラブAは水冷装置4をそのまま通過し、後の精整工程へ送られる。   (4) When finishing rolling of the first slab A is completed, the first slab A passes through the water-cooling device 4 as it is and is sent to the subsequent refining process.

(5)続いて、第1のスラブAの仕上圧延が進行する中、第3のスラブCが加熱炉1から抽出され、保持装置2に持ち上げられている第2のスラブBを追い越して可逆式熱間圧延機3に送られる。第1のスラブAの仕上圧延が完了すると同時に第3のスラブCの圧延が開始され、第3のスラブCの圧延が終了すると、第3のスラブCは水冷装置4をそのまま通過し、後の精整工程へ送られる。   (5) Subsequently, while finishing rolling of the first slab A proceeds, the third slab C is extracted from the heating furnace 1 and overwhelms the second slab B lifted to the holding device 2 so as to be reversible. It is sent to the hot rolling mill 3. When the finish rolling of the first slab A is completed, the rolling of the third slab C is started at the same time. When the rolling of the third slab C is completed, the third slab C passes through the water cooling device 4 as it is, It is sent to the refining process.

(6)そして、第3のスラブCの圧延が終了すると、保持装置2に持ち上げられていた第2のスラブBを搬送テーブル上に戻し、第2のスラブBを可逆式熱間圧延機3に送って仕上板厚まで圧延を行う。第2のスラブBの仕上圧延が終了すると、第2のスラブBは水冷装置4をそのまま通過し、後の精整工程へ送られる。   (6) Then, when the rolling of the third slab C is completed, the second slab B lifted by the holding device 2 is returned to the transfer table, and the second slab B is transferred to the reversible hot rolling mill 3. Send to roll to finish plate thickness. When the finish rolling of the second slab B is completed, the second slab B passes through the water cooling device 4 as it is and is sent to the subsequent refining process.

このように、この実施形態においては、冷却待ちを要する制御圧延材2枚と通常圧延材1枚の圧延を行うに際して、冷却装置4による冷却と、保持装置2を用いた追い越し圧延を適切に組み合わせているので、可逆式熱間圧延機3の空き時間をより低減して、圧延される圧延材の本数を増加させることができ、圧延能率を一層向上させることができる。   As described above, in this embodiment, when two controlled rolled materials that require cooling and one normal rolled material are rolled, the cooling by the cooling device 4 and the overtaking rolling using the holding device 2 are appropriately combined. Therefore, the idle time of the reversible hot rolling mill 3 can be further reduced, the number of rolled materials to be rolled can be increased, and the rolling efficiency can be further improved.

なお、この実施形態においては、圧延材の待機装置として、圧延材を搬送テーブル上から後続の圧延材が通過できる高さに持ち上げて保持する保持装置を用いている。これは、そのような保持装置であれば、圧延材を搬送テーブル上から移動したり、圧延材を搬送テーブル上に戻したりするのが容易であるからであるが、本発明は、それに限定されることはなく、例えば、圧延材を搬送テーブル上から横方向に移動させて、後続の圧延材が通過できるようにする横移動式の待機装置を用いてもよい。   In this embodiment, as a standby device for the rolled material, a holding device that lifts and holds the rolled material to a height at which the subsequent rolled material can pass from the transfer table is used. This is because, with such a holding device, it is easy to move the rolled material from the transport table or return the rolled material onto the transport table, but the present invention is not limited thereto. For example, a horizontally moving standby device that moves the rolled material in the horizontal direction from the transfer table so that the subsequent rolled material can pass therethrough may be used.

本発明の一実施形態に係る熱間圧延設備のレイアウトと、その熱間圧延設備を用いた熱間圧延方法の手順を示す図である。It is a figure which shows the procedure of the hot rolling method using the layout of the hot rolling equipment which concerns on one Embodiment of this invention, and the hot rolling equipment.

符号の説明Explanation of symbols

1 加熱炉
2 保持装置
3 可逆式熱間圧延機
4 水冷装置
1 Heating furnace 2 Holding device 3 Reversible hot rolling mill 4 Water cooling device

Claims (2)

可逆式熱間圧延機の上流側に、圧延材を搬送テーブル上から上方に持ち上げて後続の圧延材が通過できる場所に待機させるための待機装置としての保持装置を備え、可逆式熱間圧延機の下流側に、搬送テーブル上の圧延材を冷却するための冷却装置を備えた熱間圧延設備を用いた熱間圧延方法であって、
第1のスラブを前記可逆式熱間圧延機にて所定板厚まで圧延後、前記冷却装置によって制御圧延可能な温度まで冷却すると同時に、この冷却中に第2のスラブを前記可逆式熱間圧延機にて所定板厚まで圧延し、圧延後、前記待機装置としての保持装置によって制御圧延可能な温度まで保持して冷却すると同時に、前記第1のスラブを前記可逆式熱間圧延機に逆送して仕上板厚に圧延を行い、さらに、第3のスラブを前記可逆式熱間圧延機に送って仕上板厚まで圧延し、圧延終了後、前記第2のスラブを前記可逆式熱間圧延機に送って仕上板厚まで圧延を行うことを特徴とする熱間圧延方法。
A reversible hot rolling mill equipped with a holding device as a standby device for lifting the rolled material upward from the transfer table and waiting in a place where the subsequent rolled material can pass on the upstream side of the reversible hot rolling mill. Is a hot rolling method using a hot rolling facility equipped with a cooling device for cooling the rolled material on the conveyance table on the downstream side of,
The first slab is rolled to a predetermined plate thickness by the reversible hot rolling mill and then cooled to a temperature at which control rolling is possible by the cooling device. At the same time, the second slab is cooled by the reversible hot rolling. After rolling, the first slab is fed back to the reversible hot rolling mill at the same time as it is cooled to a temperature that can be controlled and rolled by the holding device as the standby device. Then, rolling to the finished sheet thickness is performed, and the third slab is sent to the reversible hot rolling mill to be rolled to the finished sheet thickness. After the rolling is completed, the second slab is rolled to the reversible hot rolling. A hot rolling method characterized by feeding to a machine and rolling to a finished plate thickness.
請求項1に記載の熱間圧延方法に用いる熱間圧延設備であって、
可逆式熱間圧延機の上流側に、圧延材を搬送テーブル上から上方に持ち上げて後続の圧延材が通過できる場所に待機させるための待機装置としての保持装置を備え、可逆式熱間圧延機の下流側に、搬送テーブル上の圧延材を冷却するための冷却装置を備えたことを特徴とする熱間圧延設備。
A hot rolling facility used in the hot rolling method according to claim 1,
A reversible hot rolling mill equipped with a holding device as a standby device for lifting the rolled material upward from the transfer table and waiting in a place where the subsequent rolled material can pass on the upstream side of the reversible hot rolling mill. A hot rolling facility comprising a cooling device for cooling the rolled material on the conveying table on the downstream side.
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