JPH0489109A - Method for joining billets in hot rolling - Google Patents
Method for joining billets in hot rollingInfo
- Publication number
- JPH0489109A JPH0489109A JP2203991A JP20399190A JPH0489109A JP H0489109 A JPH0489109 A JP H0489109A JP 2203991 A JP2203991 A JP 2203991A JP 20399190 A JP20399190 A JP 20399190A JP H0489109 A JPH0489109 A JP H0489109A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- joining
- contact
- billets
- heating
- 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.)
- Granted
Links
- 238000005304 joining Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims description 29
- 238000005098 hot rolling Methods 0.000 title claims description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims description 74
- 239000010959 steel Substances 0.000 claims description 74
- 238000003825 pressing Methods 0.000 abstract description 14
- 230000003028 elevating effect Effects 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 description 24
- 238000010586 diagram Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- AHADSRNLHOHMQK-UHFFFAOYSA-N methylidenecopper Chemical compound [Cu].[C] AHADSRNLHOHMQK-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002344 surface layer Substances 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/10—Compression, e.g. longitudinal compression
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
この発明は、先行して搬送されるシートバーの如き鋼片
と、これに引き続いて搬送される後続の鋼片とを、熱間
圧延設備の入側にて突き合わせ接合し、この接合鋼片を
連続的に圧延ラインに供給する場合にとくに有用な鋼片
の接合方法に関するものである。Detailed Description of the Invention (Industrial Field of Application) This invention provides a method for transferring a steel billet, such as a sheet bar, which is conveyed in advance, and a subsequent steel billet, which is conveyed subsequently, to a hot rolling facility. This invention relates to a method of joining steel billets that is particularly useful when butt joining is performed on the entry side of a steel billet and the joined steel billet is continuously supplied to a rolling line.
(従来の技術)
従来、熱間圧延ラインでは、圧延すべき鋼片を目標温度
に加熱したのち、−本づつ粗圧延工程、仕上げ圧延工程
に通して所望の厚みを持った熱延板に仕上げていたが、
かような圧延方式では、と(に仕上げ圧延での、圧延素
材の噛み込み不良によるライン停止等のトラブルが生じ
易く、また圧延素材の先端、後端部の形状不良に起因し
た歩留りの低下が大きいため、このような問題の早期解
決が望まれていた。(Prior art) Conventionally, in a hot rolling line, after heating the steel billet to be rolled to a target temperature, the billet is passed one by one through a rough rolling process and a finishing rolling process to finish it into a hot rolled plate with a desired thickness. was, but
Such rolling methods tend to cause troubles such as line stoppages due to poor biting of the rolled material during finish rolling, and decreases in yield due to defects in the shape of the leading and trailing ends of the rolled material. Due to the large scale of the project, it was hoped that this problem would be resolved as soon as possible.
熱間圧延ラインにおける上記の如きトラブルを解消し、
生産性のより一層の改善を図った試みとしては、特開昭
60−244401号公報あるいは特開昭61−159
285号公報に開示されているような圧延技術が知られ
ている。Eliminate the above troubles in hot rolling lines,
Attempts to further improve productivity include JP-A-60-244401 and JP-A-61-159.
A rolling technique as disclosed in Japanese Patent No. 285 is known.
(発明が解決しようとする課題)
上記各公報に開示の技術は、何れも仕上げ圧延工程の入
側で、先行する圧延素材の後端とこれに引き続く後続の
素材の先端とを接合し、数本〜数十本の圧延素材を連続
的に仕上げ圧延工程に供給しようとするものであって、
かかる圧延手法に従えば、鋼片を一本つつ圧延ラインに
供給する場合に生じていた噛み込み不良などを起こすこ
とがなく、生産性を著しく改善することができた。(Problems to be Solved by the Invention) The techniques disclosed in the above-mentioned publications all join the rear end of the preceding rolled material and the leading end of the subsequent material at the entry side of the finish rolling process, and The purpose is to continuously supply one to several dozen pieces of rolled material to the finish rolling process,
If such a rolling method is followed, it is possible to significantly improve productivity without causing defects such as biting that occurs when steel billets are fed one by one to a rolling line.
しかしながら、鋼片を接合しつつ連続的な圧延を行う場
合には、先行する鋼片の後端と後続の鋼片の先端を迅速
かつ確実に安定して接合する必要があるところ、上記特
開昭60−244401号公報に開示されているような
、鋼片の接合部を高周波加熱するものでは、比較的短時
間で目標とする接合温度に加熱できる利点はあるものの
、鋼片の接合に係わらない余計な領域までも加熱される
ため、これに使われるエネルギーの消費量が大きく、一
方特開昭61−159285号公報に開示の技術の如き
通電加熱によるものでは、鋼片表面にスケールが付着し
ている場合に電極ロールと鋼片との間の接触電気抵抗に
よってアークが発生し、電極ロールの損傷するおそれが
あり、何れの方式においても鋼片の連続熱間圧延を実現
するには不十分なものであった。However, when continuous rolling is performed while joining steel billets, it is necessary to quickly, reliably, and stably join the rear end of the preceding steel billet and the tip of the following steel billet. The method disclosed in Japanese Patent No. 60-244401 that uses high-frequency heating to join steel billets has the advantage of being able to heat the joint to the target joining temperature in a relatively short period of time, but it is difficult to join steel billets. Since unnecessary areas are heated, the amount of energy used for this is large.On the other hand, in the case of electrical heating such as the technique disclosed in JP-A No. 61-159285, scale adheres to the surface of the steel piece. When rolling the steel billet, an arc is generated due to the electrical contact resistance between the electrode roll and the steel billet, which may damage the electrode roll, and either method is not suitable for continuous hot rolling of the billet. It was sufficient.
この発明は、鋼片の接合に際してむだなエネルギーを消
費することなく簡便かつ速やかに、しかも圧延中に鋼片
の接合部分が分離破断することがないよう確実に接合で
きる新規な接合方法を提案することを目的とする。This invention proposes a new joining method that can easily and quickly join steel billets without wasting energy, and moreover, can reliably join steel billets so that the joint portions will not separate and break during rolling. The purpose is to
(課題を解決するための手段)
この発明は、熱間圧延設備の入側にて、先行して搬送さ
れる鋼片の後端部とこれに引き続く後続の鋼片の先端部
とを突き合わせて接合するに当たり、上記各鋼片の先端
部と後端部を接触させてその領域にて鋼片の厚み方向に
貫く交番磁界を印加して加熱する処理と、該鋼片を押圧
する処理とを組合せることによって銅片を相互に密着さ
せることを特徴とする熱間圧延における鋼片の接合方法
(第1発明)である。(Means for Solving the Problems) The present invention abuts the rear end of a previously conveyed steel bill with the leading end of a succeeding steel bill at the entry side of a hot rolling facility. In joining, the tip and rear ends of each of the steel pieces are brought into contact and heated by applying an alternating magnetic field that penetrates the steel pieces in the thickness direction in that area, and the process of pressing the steel pieces is performed. This is a method for joining steel pieces in hot rolling (first invention), characterized in that copper pieces are brought into close contact with each other by combining them.
この発明においては、先行する鋼片と後続の鋼片の接触
領域を、鋼片の幅方向の少なくとも両端とすること(第
2発明)、
また各鋼片を接合するに当っては鋼片の少なくとも一方
を押圧しながら加熱すること(第3発明)とし、
さらに鋼片の接触領域の加熱を担う交番磁界は、鋼片を
厚み方向に挟むC型のコアを有する少なくとも一つの交
番磁界発生コイルにて印加する(第4発明)ものとする
。In this invention, the contact area between the preceding steel billet and the following steel billet is at least at both ends of the steel billet in the width direction (second invention), and when joining each steel billet, the contact area of the steel billet is At least one side is heated while being pressed (third invention), and the alternating magnetic field responsible for heating the contact area of the steel slab is generated by at least one alternating magnetic field generating coil having a C-shaped core that sandwiches the steel slab in the thickness direction. (fourth invention).
第1図に、この発明の実施をするのに用いて好適な圧延
設備の一例を示し、同図における番号1は熱間仕上げ圧
延機群、2は熱間仕上げ圧延機1の入側で先行して搬送
される鋼片(以下、先行シートバーと記す)、3はこの
鋼片2に引き続く後続の鋼片(以下、後続シートバーと
記す)、4はシートバー2,3の搬送とこれらの接合の
際の加圧を行うピンチロール、5は先行シートバー2の
後端部と後続シートバー3の先端部の接触領域aを加熱
する役目をもった交番磁界発生コイルであって、この交
番磁界発生コイル5は磁極を形成するコア5a、コイル
5b及び電源5cからなる。FIG. 1 shows an example of rolling equipment suitable for carrying out the present invention. In the figure, number 1 is a group of hot finishing mills, and number 2 is a preceding mill on the entry side of hot finishing mill 1. 3 is the subsequent steel piece following this steel piece 2 (hereinafter referred to as the succeeding sheet bar), and 4 is the conveyance of the sheet bars 2 and 3 and these. 5 is an alternating magnetic field generating coil that has the role of heating the contact area a between the rear end of the leading sheet bar 2 and the tip of the trailing sheet bar 3; The alternating magnetic field generating coil 5 includes a core 5a forming a magnetic pole, a coil 5b, and a power source 5c.
ここで、この交番磁界発生コイル5を単体で適用する場
合には、シートバーの幅方向の中央部に配置される。ま
た、6はシートバーの接合時間を吸収するためのルーパ
ーであって、このルーパー6は、上記交番磁界発生コイ
ル5が、シートバーの搬送に同期して移動できる形式の
場合には省略される。Here, when this alternating magnetic field generating coil 5 is used alone, it is arranged at the center in the width direction of the seat bar. Further, 6 is a looper for absorbing the joining time of the sheet bars, and this looper 6 is omitted when the alternating magnetic field generating coil 5 is of a type that can move in synchronization with the conveyance of the sheet bars. .
(作 用)
先行シートバー2の後端部と、後続シートバー3の先端
部の突き合わせによる接触状態で、接触領域aに、該シ
ートバーの幅方向の中央部に配置した交番磁界発生コイ
ル5によって交番磁界dを印加すると、シートバー2.
3の各端部には、幅方向に沿って第2図に示すような渦
電流eが誘導される。シートバー2,3の各端部は、こ
の渦電流eの周回に由来した発熱によって加熱されるこ
とになるが、とくにシートバーの接触領域aには接触電
気抵抗が存在するため、この抵抗によるジュール発熱に
よって各端部の接触面の温度が第3図に示すように優先
的に上昇する。したがってこの接触状態で昇温しながら
各シートバー2.3の少なくとも一方を、接合すべきシ
ートバーへ向けて押圧するか、または予め押圧した状態
で上記の如き加熱昇温することにより効率よく極めて短
時間で該接触領域を密着させることができ、しがも該コ
イル5は非接触式なのでアークの発生によって設備に損
傷を与えるようなおそれは全くない。(Function) When the rear end of the preceding seat bar 2 and the leading end of the following seat bar 3 are in contact with each other, the alternating magnetic field generating coil 5 disposed in the center of the width direction of the seat bar is placed in the contact area a. When an alternating magnetic field d is applied by the sheet bar 2.
An eddy current e as shown in FIG. 2 is induced along the width direction at each end of 3. Each end of the seat bars 2 and 3 will be heated by the heat generated from the circulation of this eddy current e, but since there is contact electrical resistance particularly in the contact area a of the seat bar, the Due to Joule heat generation, the temperature of the contact surfaces at each end increases preferentially as shown in FIG. Therefore, by pressing at least one of the sheet bars 2.3 toward the sheet bar to be joined while raising the temperature in this contact state, or by heating and raising the temperature in the previously pressed state as described above, The contact areas can be brought into close contact in a short time, and since the coil 5 is of a non-contact type, there is no risk of damaging the equipment due to arc generation.
第2発明においては、上記の加熱をより有利に行うため
、すなわち接合の際の加熱時間の短縮やこれに要する投
入電力の軽減のために、先行シートバー2と後続シート
バー3の接触領域aを、第4図(a)〜(g)に示すよ
うに各シートバーの幅方向の少なくとも両端域とし、そ
れを除く領域にはギソヤプを設けることとした。In the second invention, in order to perform the above-mentioned heating more advantageously, that is, to shorten the heating time during joining and reduce the input power required for this, the contact area a of the preceding sheet bar 2 and the succeeding sheet bar 3 is As shown in FIGS. 4(a) to 4(g), at least both end regions in the width direction of each sheet bar are provided, and a groove is provided in the other regions.
ここに、上掲第4図に示すような形状になる鋼片の接合
がより有利に適合するのは、例えば第5図(a)に示す
ような平面形状になる鋼片を接合するに当たって各鋼片
の接合端部を加熱、押圧した場合に、鋼片の接合領域は
第5図(b)に示す如く、その両端部から中央部へと比
較的小さな押圧力でもって拡大し、特定の接合代のもと
ではその後の仕上げ圧延によっても鋼片の接合部が破断
分離するようなことがないからである。Here, joining of steel pieces having a shape as shown in FIG. 4 above is more advantageous when joining steel pieces having a planar shape as shown in FIG. 5(a), for example. When the joint ends of the steel pieces are heated and pressed, the joint area of the steel pieces expands from both ends to the center with a relatively small pressing force, as shown in Figure 5(b), and a specific This is because, under the joint allowance, the joints of the steel billets will not break and separate even during the subsequent finish rolling.
第6図は、上記のような鋼片の接合における接合代と仕
上げ圧延時における破断状況を調査した結果を示したも
のである。同図より明らかなように接触領域における接
合代Wが、鋼片幅Bに対しそれぞれ0.1倍以上、合計
で0.2倍以上であれば、その後の仕上げ圧延時におい
て接合部分が破断分離するようなおそれは全くない。FIG. 6 shows the results of an investigation into the welding allowance in joining the steel slabs as described above and the state of fracture during finish rolling. As is clear from the figure, if the welding allowance W in the contact area is at least 0.1 times or more than the billet width B, and at least 0.2 times in total, the joint will break and separate during the subsequent finish rolling. There is no fear that this will happen.
上掲第4図に示したところの図(a)は、先行シートバ
ー2の後端部と後続シートバー3の先端部を同じ曲率で
凹状に切断した場合、同図(b)は各シートバー2.3
の先、後端部とも凹状ではあるがそれらの曲率が異なる
場合、同図(C)は一方は平面形状がフラットな状態と
し、他方のみ凹状とした場合、同図(d)は一方を凸状
、他方を凹状とし、凹状の曲率を凸状の曲率よりも幾分
大きくした場合であり、ここで示した例は何れの場合も
シートバーの幅方向両端部のみを接触させ、その中央域
にギャップをもたせた例として示しであるが、この発明
に適合する切断形状はこれだけに限られるものではなく
、同図(e)、げ)に示すように両端部および中央の3
点で接触させ、その間にギャップを設けてもよく、また
図示はしないが、接触部を4点ないしはそれ以上とし、
その間にギャップを設けたようなものであってもよい。The diagram (a) shown in FIG. 4 above shows the case where the rear end of the leading sheet bar 2 and the tip of the trailing seat bar 3 are cut into a concave shape with the same curvature, and the diagram (b) shows the shape of each sheet. bar 2.3
If both the tip and rear end are concave but have different curvatures, Figure (C) shows that one side is flat and only the other is concave, and Figure (D) shows that one side is convex. The other side is concave, and the curvature of the concave is somewhat larger than the curvature of the convex.In both cases, only the widthwise ends of the sheet bars are in contact, and the center area is Although the cutting shape is shown as an example in which a gap is provided at both ends, the cutting shape suitable for the present invention is not limited to this, and as shown in FIG.
It is also possible to make contact at a point with a gap between them, or, although not shown, the contact portion may be made at four or more points,
A gap may be provided in between.
さらに同図(g)に示すように幅方向中央部を矩形状に
切欠いてものでもよい。Furthermore, as shown in FIG. 3(g), the center portion in the width direction may be cut out in a rectangular shape.
上記のような形状とするための切断手法としては、シャ
ー、ガス切断およびレーザー溶断などが適用できるが、
とくに特定の曲率で凹状に切断する場合には、2枚の曲
線刃を有するドラムシャーがとりわけ有利に適合する。Shearing, gas cutting, laser cutting, etc. can be used as cutting methods to obtain the above shape.
A drum shear with two curved blades is particularly advantageous when making concave cuts with a particular curvature.
次に鋼片を接合する場合の接合形態としては、接合予定
部を目標とする接合温度まで加熱・昇温し、該加熱を停
止した後に押圧するような接合形態、加熱・昇温を継続
したまま(ただし接合部が溶融する温度を超えない)で
目標とする接合温度に達した時点で押圧するような接合
形態、あるいは予め鋼片を押圧した状態で加熱するよう
な接合形態など種々考えられるが、通常、接合過程にお
ける鋼片の温度は1000〜1100°C程度であり、
単なる押圧だけでも各鋼片の接合は幾分進行する。この
ため第3発明では、とくに鋼片を押圧しながら加熱する
ことによって接合時間の短縮や加熱・昇温に要する投入
電力の低減を図ることとした。Next, when joining steel pieces, the joining method is to heat and raise the temperature of the part to be joined to the target joining temperature, and then press after stopping the heating, and continue heating and raising the temperature. Various joining methods are possible, such as one in which the steel pieces are left as they are (but not exceeding the temperature at which the joint part melts) and then pressed when the target joining temperature is reached, or one in which the steel pieces are pressed in advance and then heated. However, the temperature of the steel piece during the joining process is usually about 1000 to 1100°C,
The joining of the steel pieces progresses to some extent even with mere pressing. Therefore, in the third aspect of the invention, the joining time and the power required for heating and temperature raising are reduced by particularly heating the steel pieces while pressing them.
次に、この発明を実施するのに用いて好適な交番磁界発
生コイル5の模式を第7図に示し、このような交番磁界
発生コイル5を用いて、鋼片の厚み方向に対し、それを
貫くような交番磁界を印加する方式を以下、トランスバ
ース方式と記すこととする。上記のトランスバース方式
に適合し得る交番磁界発生コイル5としては、鋼片をそ
の厚み方向に挟むよう、それぞれ上下に個別配置した分
割型あるいは同極馬蹄型の交番磁界発生コイルなどの適
用も考えられるが、ここでは第4発明として鋼片の厚み
方向を挟むC型のコアをもった交番磁界発生コイルを適
用する。このような形式の交番磁界発生コイルは、鋼片
の移動に同期させつつ接合する場合における操作を容易
にするとともに、磁極のアライメントを簡便かつ正確に
行える。なお、端部の平面形状がフラットになる鋼片同
士を接合するに当って、交番磁界発生コイルを単体で用
いるような場合には、接合面を均一に加熱できるよう、
その幅方向に沿って移動するのが望ましい。また鋼片の
幅方向に沿って複数個の交番磁界dを印加するような場
合には、交番磁界発生コイルをそれに対応した分だけ設
けることによって対処できる。Next, a schematic diagram of an alternating magnetic field generating coil 5 suitable for carrying out the present invention is shown in FIG. Hereinafter, the method of applying a penetrating alternating magnetic field will be referred to as the transverse method. As the alternating magnetic field generating coil 5 that is compatible with the transverse method described above, it is also possible to consider the application of a split type or a homopolar horseshoe type alternating magnetic field generating coil that is individually arranged at the top and bottom so that the steel piece is sandwiched in the thickness direction. However, here, as the fourth invention, an alternating magnetic field generating coil having a C-shaped core sandwiching the thickness direction of the steel piece is applied. This type of alternating magnetic field generating coil facilitates operation when joining the steel pieces in synchronization with the movement of the steel pieces, and allows easy and accurate alignment of the magnetic poles. In addition, when joining steel pieces with flat ends and using a single alternating magnetic field generating coil, it is necessary to heat the joint surfaces uniformly.
It is desirable to move along the width direction. Furthermore, in the case where a plurality of alternating magnetic fields d are applied along the width direction of the steel piece, this can be handled by providing alternating magnetic field generating coils corresponding to the number of alternating magnetic fields d.
第8図(a) (b)に、鋼片の幅方向に沿って複数の
交番磁界dを印加した場合の例を示す。FIGS. 8(a) and 8(b) show an example in which a plurality of alternating magnetic fields d are applied along the width direction of a steel piece.
また、鋼片に印加する交番磁界は、接合対象とする鋼片
のサイズによっても異なるが、はぼ投入電力500〜3
000kW、加熱時間2〜8秒の条件で印加するのが望
ましく、接合の際の押圧力に関しては面圧にして3〜8
kgf/mm”程度で十分であり、また、加熱温度とし
ては1250〜1450″Cとするのが望ましい。In addition, the alternating magnetic field applied to the steel pieces varies depending on the size of the steel pieces to be welded, but the applied power ranges from 500 to 3
It is desirable to apply under the conditions of 000 kW and heating time of 2 to 8 seconds, and the pressing force during bonding is 3 to 8 in terms of surface pressure.
kgf/mm" is sufficient, and the heating temperature is preferably 1250 to 1450"C.
ちなみに、第9図にこの発明におけるトランスバース方
式とは異なる、ソレノイド型コイルSを用いて高周波加
熱を行う場合の模式を示す。ソレノイド型コイルを用い
た誘導加熱によってシートバーの如き鋼片を接合する場
合には、とくにコイルに面した領域ffi (Iii1
片の長手方向を含む)が加熱されるためにエネルギーロ
スが大きくなり、接合時間を短縮するためとくに周波数
を高くして加熱するような場合には、シートバーの表面
領域のみの局所的な温度上昇によって、目標とする接合
温度に達する以前に表層部分のみが溶融するおそれがあ
る。Incidentally, FIG. 9 shows a schematic diagram of high-frequency heating using a solenoid coil S, which is different from the transverse method according to the present invention. When joining steel pieces such as sheet bars by induction heating using a solenoid-type coil, especially the area ffi (Iiii1
(including the longitudinal direction of the sheet bar), resulting in large energy loss, and when heating at a high frequency to shorten the bonding time, the local temperature of only the surface area of the sheet bar may be reduced. Due to this increase, there is a risk that only the surface layer portion will melt before the target bonding temperature is reached.
(実施例)
7スタンドのタンデム圧延機を備えた上掲第1図に示し
たような設備を適用して、幅1000mm、厚み30m
mになる第2図に示した如き平面形状になるシートバー
(低炭素銅)を、下記の条件に従って接合しつつ連続的
に圧延機に供給して板厚3mmの熱延板に仕上げた。(Example) By applying the equipment shown in Fig. 1 above, which is equipped with a tandem rolling mill with 7 stands, a width of 1000 mm and a thickness of 30 m is applied.
Sheet bars (low carbon copper) having a planar shape as shown in FIG.
a、交番磁界(C型磁極):投入型カニ 2000Kw
、加熱時間:12秒、
周波数:500七、
b、加熱温度: 1400°C1
C0押圧力 : 面圧にして3kgf/mm2d、加圧
時間: 3秒、
e、接合形態: 鋼片を接触させ加熱した後押圧f、
交番磁界を接合面に沿って移動、その結果、圧延中にシ
ートバーの接合部が破断するようなことはなく安定して
圧延することができた。また従来の高周波加熱方式にお
ける同一条件、同一形状のシートバーの接合に比較し、
消費電力にして50%程度低減できることが、また接合
時間は約12秒であって同等の条件における従来の接合
方式の接合時間15秒に比較し20%程度接合時間を短
縮できることが確かめられた。a. Alternating magnetic field (C-type magnetic pole): Throw-in type crab 2000Kw
, Heating time: 12 seconds, Frequency: 5007, b, Heating temperature: 1400°C1 C0 Pressing force: 3 kgf/mm2d as surface pressure, Pressing time: 3 seconds, e, Joining form: Heating with steel pieces in contact After pressing f,
The alternating magnetic field was moved along the joint surface, and as a result, the sheet bar joints did not break during rolling, and stable rolling was possible. In addition, compared to joining sheet bars of the same shape and under the same conditions using the conventional high-frequency heating method,
It was confirmed that the power consumption can be reduced by about 50%, and the bonding time is about 12 seconds, which is about 20% shorter than the bonding time of 15 seconds in the conventional bonding method under the same conditions.
また、幅1000mm、厚み30mm、先端部、後端部
の曲率半径が何れも20mになる第4図(a)に示した
ような平面形状のシートバー(低炭素w/I)を、a、
交番磁界(C型磁極)二枚入電カニ 2000Kw、周
波数: 500 Hz。In addition, a sheet bar (low carbon w/I) with a planar shape as shown in FIG.
Alternating magnetic field (C-type magnetic pole) 2-piece energized crab 2000Kw, frequency: 500 Hz.
b、加熱温度: 1400°C1
C1押圧力 二 面圧にして3kgf/mm2d、加熱
・押圧後の接合代2 W=200 mm (片側100
胴)、
e、接合形態:予め押圧して加熱
の条件に従い接合した場合の接合状況についても調査し
たが、このような接合においても圧延によって接合部が
破断するようなことはなく、シートバーの先端部、後端
部がフラットになるものを接合する場合よりも、接合に
要する加熱時間はさらに短縮され、約2.4秒であった
。b. Heating temperature: 1400°C1 C1 pressing force 2 Surface pressure 3 kgf/mm2d, joining width after heating and pressing 2 W = 200 mm (100 mm on one side
(Body), e. Bonding form: We also investigated the bonding conditions when the sheets were pressed in advance and bonded according to the heating conditions, but even in such bonding, the joint did not break due to rolling, and the sheet bar The heating time required for joining was further reduced to approximately 2.4 seconds, compared to the case where the front and rear ends were joined together.
また、上記の第4図(a)の平面形状の実施例でシート
バーの接合形態のみを変更した場合として、鋼片を接触
させて加熱した後押圧する場合についても調査したが、
この場合、押圧しながら加熱したときと比較して接合面
の温度が上昇しにくいために押圧して加熱した場合に比
べて接合代が半分になったが、加熱時間を1.6秒程度
延ばすことで所定の接合が可能となった。In addition, we also investigated a case in which only the joining form of the sheet bar was changed in the example of the planar shape shown in FIG.
In this case, the temperature of the joint surface is less likely to rise compared to heating while pressing, so the joining cost was halved compared to heating while pressing, but the heating time was extended by about 1.6 seconds. This made it possible to perform the desired bonding.
(発明の効果)
かくしてこの発明によれば、先行して搬送される鋼片の
後端部と後続の鋼片の先端部を迅速かつ確実に接合でき
るので、加熱設備の大型化を伴ったり、連続圧延ライン
が延長されるようなことばはなく生産性の高い連続熱間
圧延が実現できる。(Effects of the Invention) Thus, according to the present invention, the rear end of a previously conveyed steel piece and the leading end of a subsequent steel piece can be quickly and reliably joined. There is no need to extend the continuous rolling line, and continuous hot rolling with high productivity can be achieved.
第1図は、この発明の実施をするのに用いて好適な圧延
設備の構成説明図、
第2図ば、この発明に従う鋼片の接合要領の説明図、
第3図は、接合領域の温度分布を示した図、第4図(a
)〜(g)は、鋼片の平面形状を示した図、第5図(a
)(b)は、鋼片の接合状況を示した図、第6図は、シ
ートバーの接合部の状況を示したグラフ、
第7図は、この発明の実施をするのに用いて好適なC型
の磁極をもった交番磁界発生コイルの模式図、
第8図(a)(b)は、交番磁界発生コイルの配置例を
示した図、
第9図は、従来形式の誘導加熱方式の概略を示した図で
ある。
1・・・仕上げ圧延機群 2・・・先行シートバー3
・・・後続シートバー 4・・・ピンチロール5・・
・交番磁界発生コイル
5a・・・コア 5b・・・コイル 5c・・・電源6
・・・ルーパー
d・・・交番磁界 e・・・渦電流
第4図
第6図
WEB(月食1)
第5図
(a)
第7図
第9図
参面Fig. 1 is an explanatory diagram of the configuration of rolling equipment suitable for carrying out the present invention, Fig. 2 is an explanatory diagram of the procedure for joining steel pieces according to the invention, and Fig. 3 is a temperature diagram of the welding area. A diagram showing the distribution, Figure 4 (a
) to (g) are diagrams showing the planar shape of the steel piece, and Figure 5 (a)
)(b) is a diagram showing the state of joining of steel pieces, FIG. 6 is a graph showing the state of joints of sheet bars, and FIG. 7 is a diagram showing a state of joints of sheet bars. A schematic diagram of an alternating magnetic field generating coil with C-shaped magnetic poles. Figure 8 (a) and (b) are diagrams showing an example of the arrangement of an alternating magnetic field generating coil. Figure 9 is a diagram of a conventional induction heating method. It is a diagram showing an outline. 1... Finish rolling mill group 2... Leading sheet bar 3
...Following seat bar 4...Pinch roll 5...
- Alternating magnetic field generating coil 5a...core 5b...coil 5c...power supply 6
...Looper d...Alternating magnetic field e...Eddy current Fig. 4 Fig. 6 WEB (lunar eclipse 1) Fig. 5 (a) Fig. 7 Fig. 9
Claims (1)
の後端部と、これに引き続いて搬送される後続の鋼片の
先端部とを突き合わせて接合するに当たり、 上記各鋼片の先端部と後端部を接触させ、 その領域にて鋼片の厚み方向に貫通する交番磁界を印加
して加熱する処理と、 該鋼片の少なくとも一方を押圧する処理と を組合せることによって鋼片を相互に密着させることを
特徴とする熱間圧延における鋼片の接合方法。 2、先行する鋼片と後続の鋼片の接触領域が、鋼片の幅
方向の少なくとも両端域である請求項1記載の方法。 3、鋼片を押圧した状態で加熱する請求項1又は2記載
の方法。 4、鋼片の接触領域の加熱を担う交番磁界を、鋼片を厚
み方向に挟むC型のコアを有する少なくとも一つの交番
磁界発生コイルにて印加する請求項1、2又は3記載の
方法。[Claims] 1. At the entry side of the hot rolling equipment, the rear end of the previously transported steel billet is brought into contact with the tip end of the subsequent steel billet that is subsequently transported. In joining, the front end and the rear end of each of the steel slabs are brought into contact, and an alternating magnetic field that penetrates through the thickness of the steel slab is applied in that region to heat the steel slab, and at least one of the steel slabs is pressed. A method for joining steel billets in hot rolling, characterized in that the steel billets are brought into close contact with each other by a combination of treatment. 2. The method according to claim 1, wherein the contact area between the preceding steel piece and the following steel piece is at least at both ends of the steel piece in the width direction. 3. The method according to claim 1 or 2, wherein the steel piece is heated while being pressed. 4. The method according to claim 1, 2 or 3, wherein the alternating magnetic field responsible for heating the contact area of the steel piece is applied by at least one alternating magnetic field generating coil having a C-shaped core sandwiching the steel piece in the thickness direction.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2203991A JPH0729123B2 (en) | 1990-08-02 | 1990-08-02 | Joining method of billets in hot rolling |
KR1019920700792A KR100212296B1 (en) | 1990-08-02 | 1991-08-01 | Method and device for joining billets |
CN 91108566 CN1029596C (en) | 1990-08-02 | 1991-08-01 | Method for joining steel plates and apparatus therefor |
US07/844,638 US5396050A (en) | 1990-08-02 | 1991-08-01 | Method of joining steel sheet bars and a joining apparatus |
PCT/JP1991/001029 WO1992002313A1 (en) | 1990-08-02 | 1991-08-01 | Method and device for joining billets |
DE69119393T DE69119393T3 (en) | 1990-08-02 | 1991-08-01 | METHOD AND DEVICE FOR CONNECTING STICKS |
EP91913815A EP0495993B2 (en) | 1990-08-02 | 1991-08-01 | Method and device for joining billets |
CA002067494A CA2067494C (en) | 1990-08-02 | 1991-08-01 | Method of joining steel sheet bars and a joining apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2203991A JPH0729123B2 (en) | 1990-08-02 | 1990-08-02 | Joining method of billets in hot rolling |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0489109A true JPH0489109A (en) | 1992-03-23 |
JPH0729123B2 JPH0729123B2 (en) | 1995-04-05 |
Family
ID=16482971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2203991A Expired - Fee Related JPH0729123B2 (en) | 1990-08-02 | 1990-08-02 | Joining method of billets in hot rolling |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0729123B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5814787A (en) * | 1993-01-28 | 1998-09-29 | Nippon Steel Corporation | Apparatus for welding steel bars in a continuous hot rolling process |
US6722174B1 (en) | 1999-03-10 | 2004-04-20 | Nkk Corporation | Device and method for manufacturing hot-rolled sheet steel and device and method for sheet thickness pressing used for the device and method |
JP2014014864A (en) * | 2012-07-11 | 2014-01-30 | Jfe Steel Corp | Metal plate joint device and metal plate joint method |
-
1990
- 1990-08-02 JP JP2203991A patent/JPH0729123B2/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5814787A (en) * | 1993-01-28 | 1998-09-29 | Nippon Steel Corporation | Apparatus for welding steel bars in a continuous hot rolling process |
US5994665A (en) * | 1993-01-28 | 1999-11-30 | Nippon Steel Corporation | Method of continuous hot rolling and apparatus for welding steel bars thereof |
US6722174B1 (en) | 1999-03-10 | 2004-04-20 | Nkk Corporation | Device and method for manufacturing hot-rolled sheet steel and device and method for sheet thickness pressing used for the device and method |
JP2014014864A (en) * | 2012-07-11 | 2014-01-30 | Jfe Steel Corp | Metal plate joint device and metal plate joint method |
Also Published As
Publication number | Publication date |
---|---|
JPH0729123B2 (en) | 1995-04-05 |
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