JPH046441B2 - - Google Patents
Info
- Publication number
- JPH046441B2 JPH046441B2 JP572583A JP572583A JPH046441B2 JP H046441 B2 JPH046441 B2 JP H046441B2 JP 572583 A JP572583 A JP 572583A JP 572583 A JP572583 A JP 572583A JP H046441 B2 JPH046441 B2 JP H046441B2
- Authority
- JP
- Japan
- Prior art keywords
- rolled material
- rolling
- rolled
- rolling mill
- mill
- 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.)
- Expired
Links
- 239000000463 material Substances 0.000 claims description 40
- 238000005096 rolling process Methods 0.000 claims description 32
- 238000000034 method Methods 0.000 claims description 20
- 238000005098 hot rolling Methods 0.000 claims description 8
- 238000005304 joining Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Description
【発明の詳細な説明】
本発明は、連続式熱間圧延方法に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous hot rolling method.
従来の熱間圧延方法は、加熱後のスラブを１本
ずつ圧延ラインに供給し、スラブごとに粗圧延機
次いで仕上圧延機で圧延を行う間欠圧延である。
この方法では、圧延材が圧延機を通過するさい
に、圧延材の先端部がガイドやロールに突掛かつ
たり、後端部が圧延機を抜けるときに後端部の形
状や圧延条件によつて絞込みなどを発生し、ロー
ル損傷などのトラブルが起きる。このようなトラ
ブルを回避するため、圧延速度を下げるなどの処
理が必要である。一旦トラブルが起きたときに
は、ラインの休止やロール交換を必要とする。し
たがつて、ラインの休止時間が増加し、ロール原
単位の上昇を招くことになる。 The conventional hot rolling method is an intermittent rolling method in which heated slabs are supplied one by one to a rolling line, and each slab is rolled in a rough rolling mill and then in a finishing mill.
In this method, when the rolled material passes through the rolling mill, the leading end of the rolled material may hit the guide or roll, or the trailing end may hit the guide or roll as it passes through the rolling mill, depending on the shape of the trailing end or the rolling conditions. This can cause problems such as roll damage and other problems. In order to avoid such troubles, it is necessary to take measures such as lowering the rolling speed. Once a problem occurs, it is necessary to stop the line and replace the rolls. Therefore, the downtime of the line increases, leading to an increase in roll consumption.
圧延材の先後端部は中央部にくらべて圧延速度
のバランスの崩れによる温度降下や厚み外れが発
生しやすく、また、幅中央が圧延方向に突出して
幅狭となり、所定の板幅が得られず、切り捨てら
れていた。加えて、圧延材の先端部は仕上ワー
ク・ロールのかみ込み直後およびダウンコイラ巻
付け時の急激な張力立上りにより、一部幅が狭く
なり、所定の幅が得られないことがあつた。 Compared to the center, the front and rear ends of a rolled material are more prone to temperature drop and thickness deviation due to an imbalance in rolling speed, and the center of the width protrudes in the rolling direction and becomes narrower, making it difficult to obtain the desired sheet width. It had been cut off. In addition, the width of the tip of the rolled material became narrow due to a sudden rise in tension immediately after the finishing work roll was bitten and during winding of the down coiler, making it impossible to obtain the desired width.
そこで、近年このような問題点を解消する方法
として粗圧延機の入側において、先行圧延材の後
端部と後行圧延材の先端部を重ね合せ、その側面
を仮付け溶接をして圧延材を接合し、連続圧延す
る方法が提案されている。しかし、この方法では
圧延材の接合部が他の部分より厚くなるので、次
の仕上圧延機に急激な負荷変動がかかり、板厚に
バラツキが生じる。その上仮付け部分の結合力が
弱く、圧延トラブルが多発する。 Therefore, in recent years, as a method to solve this problem, on the entry side of the rough rolling mill, the rear end of the leading rolled material and the leading end of the trailing rolled material are overlapped, and the sides are tack welded and rolled. A method of joining materials and continuously rolling them has been proposed. However, with this method, the joint part of the rolled material becomes thicker than other parts, which causes rapid load changes to be applied to the next finishing mill, resulting in variations in board thickness. Moreover, the bonding strength of the tacked parts is weak, leading to frequent rolling troubles.
したがつて、本発明の目的は、先行圧延材の後
端部と後行圧延材の先端部を円滑かつ迅速に接合
することによつて、圧延能率の向上を図ることが
できる連続式熱間圧延方法を得ることにある。 Therefore, an object of the present invention is to provide a continuous hot rolling method that can improve rolling efficiency by smoothly and quickly joining the rear end of the preceding rolled material and the leading end of the trailing rolled material. The purpose is to obtain a rolling method.
本発明の連続式熱間圧延方法は、粗圧延機また
は仕上圧延機の入側において、先行圧延材の後端
部と後行圧延材の先端部にプレス成形を施して厚
みを減少させ、該先行圧延材の後端部と後行圧延
材の先端部を同一平面上で突き合せ、突き合せ面
を溶接することによつて圧延材を接合し連続的に
圧延することを特徴としている。 The continuous hot rolling method of the present invention reduces the thickness by press-forming the trailing end of the preceding rolled material and the leading end of the trailing rolling material on the entry side of a rough rolling mill or a finishing rolling mill. It is characterized in that the rear end of the preceding rolled material and the tip of the trailing rolled material are abutted on the same plane, and the abutted surfaces are welded to join the rolled materials and continuously rolled.
次に、図面を参照して本発明の方法について説
明する。本発明の方法は連続熱間圧延ラインにお
いて、粗圧延機または仕上圧延機の入側において
圧延材に適用される。第１図に示す例では、本発
明の方法は仕上圧延機１の入側において圧延材に
適用される。ここで、入側とは圧延機入口直前と
いうことではなく入口から所要の距離だけ離れた
前方のことをいう。図示する本発明の方法におい
ては、粗圧延機２の出側から仕上圧延機１の入側
に向かつて、プレス成形機３と溶接機４とを設け
る。 Next, the method of the present invention will be explained with reference to the drawings. The method of the invention is applied to rolled material in a continuous hot rolling line, at the entry side of a roughing mill or a finishing mill. In the example shown in FIG. 1, the method of the invention is applied to a rolled material on the entry side of a finishing mill 1. In the example shown in FIG. Here, the entrance side does not mean immediately before the entrance to the rolling mill, but refers to the front a required distance away from the entrance. In the illustrated method of the present invention, a press forming machine 3 and a welding machine 4 are provided from the exit side of the rough rolling mill 2 to the entry side of the finishing rolling mill 1.
プレス成形機３は、圧延材の上下面の全幅に所
定形状の凹部を成形でき、かつ、圧延材の進行速
度に合せてその走行方向に移動できる機能を有す
るものが好ましい。 It is preferable that the press forming machine 3 has the function of being able to form a recessed portion of a predetermined shape over the entire width of the upper and lower surfaces of the rolled material, and capable of moving in the running direction in accordance with the traveling speed of the rolled material.
溶接機４は、圧延材の上下面の全幅または所望
の部分に高速で溶接でき、かつ、圧延材の進行速
度に合せてその走行方向に移動できる機能を有す
るものが好ましく、例えば、レーザ・ビームを利
用した溶接機などが好ましい。 The welding machine 4 preferably has the function of being capable of welding the entire width or desired portion of the upper and lower surfaces of the rolled material at high speed, and capable of moving in the traveling direction in accordance with the traveling speed of the rolled material, such as a laser beam welder. It is preferable to use a welding machine using
プレス成形機３と溶接機４との間には、通常の
フライング・クロツプ・シヤー５を設けることが
好ましい。このシヤー５は、圧延材の端部からク
ロツプを切断し、突き合せ面を整合させるために
設ける。当初から突き合せ面が整合している場合
には、シヤー５は必要ない。 Preferably, a conventional flying crop shear 5 is provided between the press forming machine 3 and the welding machine 4. This shear 5 is provided to cut a crop from the end of the rolled material and align the abutting surfaces. If the abutting surfaces are aligned from the beginning, the shear 5 is not necessary.
次に、第２図から第４図までを参照して、本発
明の方法の工程について説明する。第２図に示す
ように、まずプレス成形機３によつて、先行圧延
材１０ａの後端部の上下面の全幅に所定の形状の
凹部１１を成形する。次いで、同様に第３図に示
すように、後行圧延材１０ｂの先端部の上下面の
全幅にプレス成形機３によつて所定形状の凹部１
１を成形する。このプレス成形の目的は、圧延材
突き合せ面の断面積を減少させて、溶接時間の短
縮化を図り圧延材の温度降下を防止するととも
に、溶接ビードの盛上りを収容するためである。 Next, the steps of the method of the present invention will be explained with reference to FIGS. 2 to 4. As shown in FIG. 2, first, the press forming machine 3 forms a recess 11 of a predetermined shape over the entire width of the upper and lower surfaces of the rear end portion of the pre-rolled material 10a. Next, as similarly shown in FIG. 3, a recess 1 of a predetermined shape is formed in the entire width of the upper and lower surfaces of the tip of the trailing rolled material 10b by the press forming machine 3.
Mold 1. The purpose of this press forming is to reduce the cross-sectional area of the abutting surfaces of the rolled materials, thereby shortening the welding time, preventing a drop in the temperature of the rolled materials, and accommodating the build-up of the weld bead.
次いで、第４図に示すように、先行圧延材１０
ａの後端部と後行圧延材１０ｂの先端部とを同一
平面上で突き合せ、そして、突き合せ面の上下側
またはいずれか一方の側から全幅または部分的に
溶接機４によつて溶接する。 Next, as shown in FIG. 4, the previously rolled material 10
The rear end of a and the leading end of the trailing rolled material 10b are butted on the same plane, and the welding machine 4 is used to weld the entire width or part from the upper and lower sides of the abutting surface or from either side. do.
以上の工程を順次繰り返すことによつて、圧延
材を次々に接合して連続的に熱間圧延を行う。 By sequentially repeating the above steps, the rolled materials are joined one after another and hot rolled continuously.
次に、本発明の方法の実施例について説明す
る。加熱炉から抽出した２本のスラブ（厚み270
mm×幅1550mm）を通常の連続熱間圧延ラインにお
ける６スタンドからなる粗圧延機によつて厚み30
mm×幅1500mmの圧延材とした。次いで粗圧延機と
仕上圧延機との間において、前記圧延材の先行圧
延材の後端部と後行圧延材の先端部をそれぞれプ
レス成形機で40％圧下し、厚みを18mmまで減厚し
た。各圧延材の端部をシヤーによつて切断整合
し、減厚部の長さを40mmとし、切断端面を同一平
面上で突き合せ、突き合せ面を1000mm長さにわた
りレーザ・ビームによる溶接を行つた。このとき
のレーザ・ビームの出力は20kwで、溶接時間は
20秒であつた。粗圧延機の最終スタンドの圧延速
度は1.0ｍ／secであり、仕上圧延機の第１スタン
ドの圧延速度は1.0ｍ／secであつた。仕上圧延機
の第１スタンドと第２スタンドとの間に設けた油
圧ルーパによつて接合部の厚み差による圧延張力
の変動を制御することにより、接合部が破断する
ことなく連続的に熱間圧延を完了することができ
た。 Next, examples of the method of the present invention will be described. Two slabs extracted from the heating furnace (thickness 270
mm x width 1550 mm) to a thickness of 30
The rolled material was mm x width 1500 mm. Next, between the rough rolling mill and the finishing rolling mill, the rear end of the preceding rolled material and the leading end of the trailing rolled material were each rolled down by 40% using a press forming machine to reduce the thickness to 18 mm. . The ends of each rolled material were cut and aligned using a shear, the length of the reduced thickness section was 40 mm, the cut ends were butted on the same plane, and the butted surfaces were welded over a length of 1000 mm using a laser beam. Ivy. The laser beam output at this time was 20kw, and the welding time was
It was hot in 20 seconds. The rolling speed of the last stand of the rough rolling mill was 1.0 m/sec, and the rolling speed of the first stand of the finishing mill was 1.0 m/sec. A hydraulic looper installed between the first stand and the second stand of the finishing rolling mill controls fluctuations in rolling tension due to the difference in thickness of the joint, allowing continuous hot rolling without breaking the joint. I was able to complete the rolling.
以上の説明から明らかなように、本発明の方法
によれば、圧延材の接合が簡単であり、材料歩留
が向上し、ロール組替回数の減少にともない生産
性の向上、ロール原単位の向上、ライン休止時間
の短縮化による省エネルギを達成できる。 As is clear from the above explanation, according to the method of the present invention, joining of rolled materials is easy, material yield is improved, productivity is improved by reducing the number of roll changes, and roll consumption rate is reduced. It is possible to achieve energy savings by improving production efficiency and shortening line downtime.
第１図は本発明の方法を実施する装置の概略説
明図。第２図から第４図までは本発明の方法を実
施する工程の説明図。
１：仕上圧延機、２：粗圧延機、３：プレス成
形機、４：溶接機、５：フライング・クロツプ・
シヤー、１０ａ：先行圧延材、１０ｂ：後行圧延
材。
FIG. 1 is a schematic explanatory diagram of an apparatus for carrying out the method of the present invention. FIGS. 2 to 4 are explanatory diagrams of steps for carrying out the method of the present invention. 1: Finish rolling mill, 2: Rough rolling mill, 3: Press forming machine, 4: Welding machine, 5: Flying crop
Shear, 10a: leading rolled material, 10b: trailing rolled material.
Claims (1)
先行圧延材の後端部と後行圧延材の先端部にプレ
ス成形を施して厚みを減少させ、該両端部を同一
平面上で突き合せ、突合せ面を溶接することによ
つて圧延材を次々に接合して連続的に熱間圧延を
行うことからなる連続式熱間圧延方法。1 On the entry side of the rough rolling mill or finishing rolling mill,
The rear end of the leading rolled material and the leading end of the trailing rolled material are press-formed to reduce their thickness, the two ends are brought together on the same plane, and the abutted surfaces are welded to form the rolled materials one after another. A continuous hot rolling method consisting of continuous hot rolling by joining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP572583A JPS59130603A (en) | 1983-01-17 | 1983-01-17 | Continuous hot rolling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP572583A JPS59130603A (en) | 1983-01-17 | 1983-01-17 | Continuous hot rolling method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59130603A JPS59130603A (en) | 1984-07-27 |
| JPH046441B2 true JPH046441B2 (en) | 1992-02-05 |
Family
ID=11619094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP572583A Granted JPS59130603A (en) | 1983-01-17 | 1983-01-17 | Continuous hot rolling method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59130603A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5121873A (en) * | 1990-06-06 | 1992-06-16 | Hitachi Ltd. | Method of and apparatus for joining hot materials to be rolled to each other as well as continuous hot rolling method and system |
| WO1992002315A1 (en) * | 1990-08-02 | 1992-02-20 | Kawasaki Steel Corporation | Method of joining billets during hot rolling and method of continuous hot rolling |
| KR100321065B1 (en) * | 1997-12-24 | 2002-03-08 | 이구택 | Double sided welding structure of hot rolled material using laser |
| JP2009142899A (en) * | 2009-03-27 | 2009-07-02 | Mitsubishi-Hitachi Metals Machinery Inc | Equipment and method for hot-rolling continued steel strip |
| JP5765328B2 (en) * | 2012-12-26 | 2015-08-19 | Ｊｆｅスチール株式会社 | Cold rolling equipment and cold rolling method |
-
1983
- 1983-01-17 JP JP572583A patent/JPS59130603A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59130603A (en) | 1984-07-27 |
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