JPH0716684B2 - Continuous rolling method for billet - Google Patents
Continuous rolling method for billetInfo
- Publication number
- JPH0716684B2 JPH0716684B2 JP20389690A JP20389690A JPH0716684B2 JP H0716684 B2 JPH0716684 B2 JP H0716684B2 JP 20389690 A JP20389690 A JP 20389690A JP 20389690 A JP20389690 A JP 20389690A JP H0716684 B2 JPH0716684 B2 JP H0716684B2
- Authority
- JP
- Japan
- Prior art keywords
- billet
- steel slab
- steel
- heating
- rolling
- 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 - Fee Related
Links
Classifications
-
- 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
- B21B1/265—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 and by compressing or pushing the material in rolling direction
-
- 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
- B21B2265/00—Forming parameters
- B21B2265/10—Compression, e.g. longitudinal compression
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は鋼片の連続圧延方法に関する。TECHNICAL FIELD The present invention relates to a continuous rolling method for billets.
［従来の技術］ 近年、シートバーを連続的に熱間圧延するため、仕上圧
延中の先行鋼片の後端部に、粗圧延後の後続鋼片の先端
部を接合し、この接合したシートバーを連続圧延する方
法が提案されている。[Prior Art] In recent years, since the sheet bar is continuously hot-rolled, the leading end of the subsequent steel piece after rough rolling is joined to the trailing end of the preceding steel piece during finish rolling. A method of continuously rolling a bar has been proposed.
この時、従来の連続圧延方法は、先行鋼片の後端部と後
続鋼片の先端部とを加熱し、これら両端部の端面を互い
に押圧して接合することとしている。At this time, in the conventional continuous rolling method, the rear end portion of the preceding steel piece and the leading end portion of the subsequent steel piece are heated, and the end surfaces of these both end portions are pressed against each other to join them.
尚、この連続圧延方法について、特開昭61-242768号公
報には直接通電加熱法を用いて鋼片を加熱し、接合する
方法が開示されている。又、特開昭60-244401号公報に
は、高周波誘導加熱法を用いて鋼片を加熱し、接合する
方法が開示されている。Regarding this continuous rolling method, Japanese Patent Laid-Open No. 61-242768 discloses a method of heating and joining steel slabs by using a direct current heating method. Further, Japanese Patent Application Laid-Open No. 60-244401 discloses a method of heating and joining steel pieces by using a high frequency induction heating method.
［発明が解決しようとする課題］ 然るに、連続圧延方法にあっては、圧延中の先行鋼片に
後続鋼片を接合させるため、短時間で接合しなければな
らない。[Problems to be Solved by the Invention] However, in the continuous rolling method, since the succeeding billet is joined to the preceding billet being rolled, it is necessary to join it in a short time.
然しながら、特開昭61-242768号公報に記載の直接通電
加熱法を用いる場合に、短時間接合を実現するために
は、投入電流が非常に大きくなり、直接通電のための接
触面となる通電ロール表面と鋼片表面とに局部電流によ
る溶着疵を生ずるという欠点がある。However, when the direct current heating method described in JP-A-61-242768 is used, in order to realize short-time bonding, the applied current becomes extremely large, and the current applied as the contact surface for direct current is applied. There is a drawback in that welding defects due to local current occur on the roll surface and the billet surface.
又、特開昭60-244401号公報に記載の高周波誘導加熱法
を用いる場合には、鋼片の接合端面以外の部分をも広く
加熱するものであるため、加熱時間が長い、大きな投入
電力を要するという欠点がある。Further, when the high frequency induction heating method described in JP-A-60-244401 is used, since a portion other than the joint end face of the steel piece is also widely heated, a long heating time and a large input power are required. There is a drawback that it costs.
本発明は、鋼片の連続圧延方法において、鋼片の端部を
効率的良く加熱し、短時間接合を実現することを目的と
する。An object of the present invention is to efficiently heat an end portion of a steel slab in a continuous rolling method for a steel slab and realize short-time joining.
［課題を解決するための手段］ 請求項１に記載の本発明は、鋼片圧延装置の圧延機の入
側で、先行鋼片の後端部と後続鋼片の先端部とを加熱
し、それら両端部の端面を互いに押圧して接合した後、
この接合した鋼片を連続圧延する、鋼片の連続圧延方法
において、鋼片の上記接合端面に平行な磁力線を有する
交番磁界を該鋼片の端部に印加することにより、該鋼片
の端部を誘導加熱するようにしたものである。[Means for Solving the Problem] The present invention according to claim 1 heats a trailing end portion of a preceding steel piece and a leading end portion of a following steel piece on the entrance side of a rolling mill of a billet rolling device, After pressing and joining the end faces of both ends,
In the continuous rolling method of the billet, which continuously rolls the joined billet, by applying an alternating magnetic field having magnetic lines of force parallel to the joining end face of the billet to the end of the billet, the end of the billet is applied. Induction heating is applied to the part.
請求項２に記載の本発明は、前記交番磁界を鋼片の軸方
向端部のみに印加することにより、該鋼片の幅方向端部
のみを誘導加熱し、接合するようにしたものである。According to a second aspect of the present invention, the alternating magnetic field is applied only to the axial end portions of the steel pieces, so that only the widthwise end portions of the steel pieces are induction-heated and joined. .
請求項３に記載の本発明は、鋼片圧延装置の圧延機の入
側で、先行鋼片の後端部と後続鋼片の先端部とを加熱
し、それら両端部の端面を互いに押圧して接合した後、
この接合した鋼片を連続圧延する、鋼片の連続圧延方法
において、鋼片の幅方向端部のみを加熱し、接合するよ
うにしたものである。The present invention according to claim 3 heats the trailing end portion of the preceding steel piece and the leading end portion of the following steel piece on the entrance side of the rolling mill of the billet rolling device and presses the end faces of both end portions thereof against each other. After joining,
In the continuous rolling method of the billet, in which the joined billets are continuously rolled, only the widthwise end portions of the billets are heated and joined.
［作用］ 本発明者は、鋼片の短時間接合を実現させるための加熱
方法として、誘導加熱法のうち、鋼片の接合端面に平行
な磁力線を有する交番磁界を該鋼片の端部に印加するこ
と（換言すれば、鋼片の端部平面に対して磁力線を貫通
させること）により、この交番磁界によって誘起される
渦電流が該接合端面近傍に集中発生し、鋼片の端部を効
率良く加熱できることを見出したのである。[Operation] Among the induction heating methods, the present inventor has proposed, as a heating method for realizing short-time joining of steel slabs, an alternating magnetic field having magnetic lines of force parallel to the joining end surface of the steel slab to the end of the steel slab. By applying (in other words, penetrating the magnetic field lines to the end surface of the steel piece), eddy currents induced by this alternating magnetic field are concentrated near the joint end surface, and the end portion of the steel piece is They have found that they can be heated efficiently.
第１図に本発明方法による貫通磁界型の誘導加熱装置を
鋼片の接合端面近傍に配置した状態を示す。第１図にお
いて、１は鋼片、２は誘導加熱用コイル、３は鉄芯、４
は磁力線、５は接合端面である。FIG. 1 shows a state in which a through-field type induction heating device according to the method of the present invention is arranged near the joint end face of a steel slab. In FIG. 1, 1 is a steel slab, 2 is an induction heating coil, 3 is an iron core, 4
Is a line of magnetic force, and 5 is a joining end surface.
第２図に第１図の誘導加熱装置によって誘起された、鋼
片１内に生じた渦電流分布を示す。第２図によれば、接
合端面５の近傍に渦電流６の集中が見られ、接合端面５
が幅方向において部分的ではあるが効率的に加熱されて
いることが認められる。FIG. 2 shows the eddy current distribution generated in the steel slab 1 induced by the induction heating device of FIG. According to FIG. 2, the eddy currents 6 are concentrated near the joint end face 5, and
It can be seen that is heated efficiently though partially in the width direction.
第３図は従来方法（特開昭60-244401号公報）によるコ
イル内鋼片貫通型加熱装置による誘起電流分布を示す。
第３図によれば、接合端面５への渦電流６の集中が少な
く、接合端面５が効率的には加熱されていないことが認
められる。FIG. 3 shows a distribution of induced current by a heating apparatus for penetrating a steel piece in a coil by a conventional method (Japanese Patent Laid-Open No. 60-244401).
According to FIG. 3, it is recognized that the concentration of the eddy current 6 on the joint end face 5 is small and the joint end face 5 is not efficiently heated.
第４図に本発明方法の加熱装置（第１図）による鋼片の
接合端面近傍の温度分布と、従来方法の加熱装置（第３
図）による鋼片の接合端面近傍の温度分布とを比較して
示す。加熱条件は、いずれの加熱装置においても、1000
kw、加熱時間５秒、鋼片厚み30mm、鋼片幅1000mm、鋼種
軟鋼であった。第４図によれば、本発明方法の加熱装置
を用いることにより、接合端面を効率良く加熱できるこ
とが認められる。この第４図の加熱実験後、圧延テスト
を行なった結果、本発明方法では良好な連続圧延を行な
うことができたが、従来方法では圧延中に接合端面が剥
離し連続圧延不能となった。FIG. 4 shows the temperature distribution in the vicinity of the joining end surface of the steel piece by the heating device of the method of the present invention (FIG. 1) and the heating device of the conventional method (third part).
Fig. 3) shows the temperature distribution near the joint end surface of the steel slab according to the figure). The heating condition is 1000 for any heating device.
kw, heating time 5 seconds, billet thickness 30 mm, billet width 1000 mm, steel grade mild steel. According to FIG. 4, it is recognized that the joint end face can be efficiently heated by using the heating device of the method of the present invention. As a result of conducting a rolling test after the heating experiment of FIG. 4, good continuous rolling could be carried out by the method of the present invention, but by the conventional method, the joint end face was peeled off during rolling and continuous rolling became impossible.
次に、本発明者は、鋼片の端部における幅方向接合長さ
を短くして加熱効率を高めることに着目した結果、接合
鋼片の圧延中に生ずる破断は、幅方向端部に切欠がある
ことに起因する応力集中によって引き起こされ易く、こ
の幅方向端部から破断し易いものであることを知見し
た。Next, the present inventor has focused on shortening the width-direction joining length at the ends of the steel pieces to improve heating efficiency, and as a result, the fracture that occurs during rolling of the joined steel pieces is notched at the width-direction ends. It was found that the stress is likely to be caused by the stress concentration due to the presence of the cracks, and that the end portions in the width direction are easily broken.
上述の知見から、本発明者は、前述の本発明方法の加熱
装置を用いるに際し、該加熱装置を鋼片の幅方向端部に
配置し、前記交番磁界を鋼片の幅方向端部のみに印加
し、該鋼片の幅方向端部のみを誘導加熱し、接合するこ
とにより、加熱効率を更に向上できることを見出した。From the above findings, the present inventor, when using the heating device of the method of the present invention described above, arrange the heating device at the widthwise end of the steel piece, the alternating magnetic field only at the widthwise end of the steel piece. It has been found that the heating efficiency can be further improved by applying and inductively heating only the widthwise end portions of the steel slab and joining.
即ち、連続圧延方法において、鋼片は接合端面の幅方向
全面を接合せしめる必要がなく、圧延中の鋼片に作用す
る引張力に耐えられる接合力を確保できれば、接合端面
のうちの部分接合でも足りるのである。That is, in the continuous rolling method, the steel piece does not need to be joined across the entire width direction of the joining end surface, and if the joining force that can withstand the tensile force acting on the steel piece during rolling can be secured, even partial joining of the joining end surface is possible. It is enough.
尚、本発明者は、上述の鋼片の接合端面のうちの幅方向
端部のみを加熱し、接合する方法が、加熱手段として誘
導加熱を用いることに限らず、他の加熱手段による場合
でも有効であり、その加熱効率を向上できることをも併
せ見出した。The present inventor heats only the width direction end portion of the joining end surface of the steel piece described above, and the joining method is not limited to the use of induction heating as the heating means, and even when other heating means is used. It was also found that it is effective and that the heating efficiency can be improved.
以上のように、本発明によれば、鋼片の連続圧延方法に
おいて、鋼片の端部を効率的良く加熱し、短時間接合を
実現することができる。As described above, according to the present invention, in the continuous rolling method of a steel slab, the end portion of the steel slab can be efficiently heated and short-time joining can be realized.
尚、本発明の実施において、先行鋼片と後続鋼片の加熱
は、両者の端部を互いに近接させて加熱する態様、或い
は両者の端部を互いに当接させて加熱する態様のいずれ
であっても良い。又、先行鋼片と後続鋼片の押圧タイミ
ングは、加熱中、或いは加熱後のいずれであっても良
い。又、先行鋼片と後続鋼片の加熱／押圧は、先行鋼片
と後続鋼片を共に走行させながら行なう、或いは先行鋼
片の後端部を停止させて該後端部に後続鋼片の先端部を
突き合わせて行なうのいずれであっても良い。In the practice of the present invention, the heating of the preceding steel piece and the following steel piece is either a mode of heating both ends close to each other or a mode of heating both ends in contact with each other. May be. Further, the pressing timing of the preceding steel piece and the following steel piece may be during heating or after heating. Further, the heating / pressing of the preceding steel piece and the following steel piece is performed while the preceding steel piece and the following steel piece travel together, or the rear end portion of the preceding steel piece is stopped and the subsequent steel piece It does not matter if the tips are butted.
［実施例］ （第１実施例） 第５図は本発明の第１実施例を示す模式図である。先行
鋼片1Aは仕上圧延機９により拘束されながら走行し、且
つ後続鋼片1Bは押込装置８により拘束されながら走行し
ており、先行鋼片1Aの後端部と後続鋼片1Bの先端部と
は、それらの接合端面５を本発明の誘導加熱装置７によ
り前述の如く加熱されながら、押込装置８により押圧さ
れて接合される。[Embodiment] (First Embodiment) FIG. 5 is a schematic view showing a first embodiment of the present invention. The preceding billet 1A is running while being restrained by the finish rolling mill 9, and the following billet 1B is running while being restrained by the pushing device 8, and the trailing end of the preceding billet 1A and the leading end of the following billet 1B are being run. That is, the joining end surfaces 5 are pressed and joined by the pushing device 8 while being heated by the induction heating device 7 of the present invention as described above.
先行鋼片1Aと後続鋼片1Bはこれにより接合されて仕上圧
延され、連続的に非定常部のない安定した状態で圧延可
能となる。The preceding steel slab 1A and the subsequent steel slab 1B are joined and finish-rolled by this, and can be continuously rolled in a stable state without an unsteady portion.
加熱装置７は鋼片１の進行方向に１〜3mの長さを備えて
おり、両鋼片1A、1Bの進行に併せてそれらの接合端面５
を連続的に加熱できる。The heating device 7 is provided with a length of 1 to 3 m in the traveling direction of the steel slab 1, and the joining end surface 5 of the steel slabs 1A and 1B is moved along with the progress of the steel slabs 1A and 1B.
Can be heated continuously.
尚、上記第１実施例において、鋼片1A、1Bの走行速度は
40m/分、加熱装置７による接合端面５の加熱温度は1350
℃、押込装置８による押圧力は3kg/mm2、両鋼片1A、1B
の接合時間は５秒であった。In the first embodiment, the traveling speed of the steel pieces 1A and 1B is
40m / min, the heating temperature of the joint end face 5 by the heating device 7 is 1350
℃, pushing force by pushing device 8 is 3kg / mm 2 , both steel pieces 1A, 1B
The bonding time was 5 seconds.
（第２実施例） 第６図は本発明の第２実施例を示す模式図である。仕上
圧延機９の入側にルーパー10を設け、仕上圧延機９によ
る圧延中の先行鋼片1Aの後端部を停止させ、この先行鋼
片1Aの後端部に後続鋼片1Bの先端部を停止状態で突き合
わせ、それらの接合端面５を加熱し、接合するものであ
る。この時、加熱装置７の入側と出側の両方に押込装置
８が設けられる。(Second Embodiment) FIG. 6 is a schematic view showing a second embodiment of the present invention. A looper 10 is provided on the entry side of the finish rolling mill 9 to stop the trailing end of the preceding billet 1A during rolling by the finishing mill 9 and the leading end of the following billet 1B to the trailing end of this leading billet 1A. Are abutted in a stopped state, and their joint end faces 5 are heated and joined. At this time, the pushing device 8 is provided on both the inlet side and the outlet side of the heating device 7.
尚、この第２実施例において、加熱装置８による接合端
面５の加熱温度は1350℃、押込装置８による押圧力は3k
g/mm2、両鋼片1A、1Bの接合時間は５秒であった。In the second embodiment, the heating temperature of the joint end surface 5 by the heating device 8 is 1350 ° C., and the pressing force by the pressing device 8 is 3 k.
The joining time of g / mm 2 and both steel pieces 1A and 1B was 5 seconds.
［発明の効果］ 以上のように本発明によれば、鋼片の連続圧延方法にお
いて、鋼片の端部を効率的良く加熱し、短時間接合を実
現することができる。[Effects of the Invention] As described above, according to the present invention, in the continuous rolling method for a steel slab, it is possible to efficiently heat the end portion of the steel slab and realize short-time joining.
尚、本発明にあっては、鋼片の連続圧延方法において、
加熱効率が向上することから、加熱装置の小規模化が可
能となり、コンパクトな接合装置により、安定した接合
を実現でき、高い圧延歩留りと生産性の改善が得られ
る。In the present invention, in the continuous rolling method for billet,
Since the heating efficiency is improved, the heating device can be downsized, and the compact joining device can realize stable joining, high rolling yield and improvement in productivity.
第１図は本発明による鋼片加熱状態を示す模式図、第２
図は本発明方法による鋼片内渦電流分布を示す模式図、
第３図は従来方法による鋼片内渦電流分布を示す模式
図、第４図は加熱方法と接合端面近傍の温度分布との関
係を示す線図、第５図は第１実施例を示す模式図、第６
図は第２実施例を示す模式図である。 １…鋼片、２…誘導加熱用コイル、３…鉄芯、４…磁力
線、５…接合端面、７…誘導加熱装置、８…押込装置、
９…仕上圧延機。FIG. 1 is a schematic view showing a heating state of a billet according to the present invention,
The figure is a schematic diagram showing the eddy current distribution in the steel slab according to the method of the present invention,
FIG. 3 is a schematic diagram showing an eddy current distribution in a billet by a conventional method, FIG. 4 is a diagram showing a relationship between a heating method and a temperature distribution in the vicinity of a joint end surface, and FIG. 5 is a schematic diagram showing a first embodiment. Figure, 6th
The drawing is a schematic view showing a second embodiment. DESCRIPTION OF SYMBOLS 1 ... Steel piece, 2 ... Induction heating coil, 3 ... Iron core, 4 ... Magnetic force line, 5 ... Joining end surface, 7 ... Induction heating device, 8 ... Pushing device,
9 ... Finishing rolling mill.
Claims (3)
の後端部と後続鋼片の先端部とを加熱し、それら両端部
の端面を互いに押圧して接合した後、この接合した鋼片
を連続圧延する、鋼片の連続圧延方法において、鋼片の
上記接合端面に平行な磁力線を有する交番磁界を該鋼片
の端部に印加することにより、該鋼片の端部を誘導加熱
することを特徴とする鋼片の連続圧延方法。Claims: 1. At the entrance side of the rolling mill of the billet rolling device, the rear end of the preceding billet and the tip of the following billet are heated, and the end faces of the both ends are pressed against each other to join, In the continuous rolling method of the billet, which continuously rolls the joined billet, by applying an alternating magnetic field having magnetic lines of force parallel to the joining end face of the billet to the end of the billet, the end of the billet is applied. A method for continuously rolling a steel slab, which comprises inductively heating a portion.
加することにより、該鋼片の幅方向端部のみを誘導加熱
し、接合する請求項１記載の鋼片の連続圧延方法。2. The continuous rolling method for a steel slab according to claim 1, wherein the alternating magnetic field is applied only to the widthwise end of the steel slab to induce and heat only the widthwise end of the steel slab. .
の後端部と後続鋼片の先端部とを加熱し、それら両端部
の端面を互いに押圧して接合した後、この接合した鋼片
を連続圧延する、鋼片の連続圧延方法において、鋼片の
幅方向端部のみを加熱し、接合することを特徴とする鋼
片の連続圧延方法。3. A billet rolling apparatus, at the entrance side of a rolling mill, heats a rear end of a preceding billet and a leading end of a trailing billet, and presses the end faces of both ends thereof to join them together, In the continuous rolling method of a steel slab, which continuously rolls this joined steel slab, only the width direction end part of the steel slab is heated and joined, The continuous rolling method of the steel slab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20389690A JPH0716684B2 (en) | 1990-08-02 | 1990-08-02 | Continuous rolling method for billet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20389690A JPH0716684B2 (en) | 1990-08-02 | 1990-08-02 | Continuous rolling method for billet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0489108A JPH0489108A (en) | 1992-03-23 |
| JPH0716684B2 true JPH0716684B2 (en) | 1995-03-01 |
Family
ID=16481512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20389690A Expired - Fee Related JPH0716684B2 (en) | 1990-08-02 | 1990-08-02 | Continuous rolling method for billet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0716684B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6184508B1 (en) * | 1993-12-16 | 2001-02-06 | Shigeru Isoyama | Apparatus for joining metal pieces using induction heating |
-
1990
- 1990-08-02 JP JP20389690A patent/JPH0716684B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0489108A (en) | 1992-03-23 |
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