JPS6254561B2 - - Google Patents
Info
- Publication number
- JPS6254561B2 JPS6254561B2 JP18095281A JP18095281A JPS6254561B2 JP S6254561 B2 JPS6254561 B2 JP S6254561B2 JP 18095281 A JP18095281 A JP 18095281A JP 18095281 A JP18095281 A JP 18095281A JP S6254561 B2 JPS6254561 B2 JP S6254561B2
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- rolled
- thickness
- forging press
- 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
- 238000005096 rolling process Methods 0.000 claims description 53
- 238000005242 forging Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 21
- 230000009467 reduction Effects 0.000 description 15
- 238000010438 heat treatment Methods 0.000 description 6
- 238000003303 reheating Methods 0.000 description 5
- 238000009749 continuous casting Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- YBJHBAHKTGYVGT-ZKWXMUAHSA-N (+)-Biotin Chemical compound N1C(=O)N[C@@H]2[C@H](CCCCC(=O)O)SC[C@@H]21 YBJHBAHKTGYVGT-ZKWXMUAHSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- FEPMHVLSLDOMQC-UHFFFAOYSA-N virginiamycin-S1 Natural products CC1OC(=O)C(C=2C=CC=CC=2)NC(=O)C2CC(=O)CCN2C(=O)C(CC=2C=CC=CC=2)N(C)C(=O)C2CCCN2C(=O)C(CC)NC(=O)C1NC(=O)C1=NC=CC=C1O FEPMHVLSLDOMQC-UHFFFAOYSA-N 0.000 description 1
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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Description
【発明の詳細な説明】
この発明は、厚板の圧延設備に関し、とくに厚
板圧延機のミルラインの入側で圧延の直前に、被
圧延素材をその肉厚の向きに鍛造プレスでもつて
圧下を加えることにより、被圧延素材の凝固過程
に由来するザク（Loose Structure）欠かんを圧
着消滅させ、高品質の厚板を有利に提供しようと
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to rolling equipment for thick plates, and in particular, immediately before rolling on the entry side of a mill line of a thick plate rolling mill, the material to be rolled is rolled in the direction of its wall thickness using a forging press. By adding this, the loose structure defects resulting from the solidification process of the rolled material are crimped and eliminated, thereby advantageously providing a high-quality thick plate.
原子力機器化学プラント用圧力容器などに用い
られる厚板は、厳しい品質特性を有することが要
望される。 Thick plates used for pressure vessels for nuclear equipment, chemical plants, etc. are required to have strict quality characteristics.
かような厚板は通常、分塊圧延ときには鋳塊に
鍛造を施して得られる被圧延素材つまりスラブに
必要な手入れを施し、均熱をしたのち、幅出し圧
延と仕上圧延によつて製造されるが、分塊圧延ス
ラブは、鋳造スラブに比しザク欠かんを残す傾向
が大きく、さりとて鍛造スラブはコストが嵩む不
利が著しい。一方で近年目ざましい連続鋳造の比
率拡大の下でその技術革新の結果300mm×2000mm
をこえる大断面のスラブが連続鋳造で得られるこ
とから、これを厚板の被圧延素材に利用すること
は有利であるがそれに特有な中心偏析などが不可
避なため、やはりザク状欠かんを残す原因が含ま
れる。そこでこの発明は、厚板圧延をもつてする
圧下比の下では、元来解決のために著しい負担が
強いられたザク状欠かんをとくに有利に回避する
ことにあわせ、さらに厚板製造のコストダウンに
一層有利な連続鋳造スラブを被圧延素材として適
用することをも可能ならしめようとするものであ
る。 Such thick plates are usually produced by forging an ingot during blooming rolling, giving the necessary care to the rolled material, that is, the slab, and soaking it, then tentering rolling and finishing rolling. However, blooming rolled slabs have a greater tendency to leave cavities than cast slabs, and forged slabs have a significant disadvantage in that they are costly. On the other hand, due to the remarkable increase in the ratio of continuous casting in recent years, as a result of technological innovation, 300mm x 2000mm
Slabs with large cross-sections exceeding Contains causes. Therefore, the present invention particularly advantageously avoids the chipping, which originally required a considerable burden to solve under the reduction ratio of thick plate rolling, and further reduces the cost of producing thick plates. It is also intended to make it possible to apply continuous casting slabs, which are more advantageous for down, as rolling materials.
さてスラブのザク状をとくに、圧延工程におい
て圧着し、超音波探傷欠かんのない健全な厚板製
品とするためには、製品厚に対するスラブ厚の比
で与えられる圧下比が３〜５であるを要するとさ
れ、ここに厚板圧延機の１パス当り圧下量は一般
に最大でも20〜50mm程度であるので、パス回数が
多くなるだけでなく、被圧延素材としての極厚ス
ラブは手入れを必要とするので、手入れロスの増
加や、加熱燃料原単位の悪化、さらには平面形状
の劣化による圧延歩留りの低下など不利が著し
い。 Now, in order to compress the rough shape of the slab in the rolling process and make a sound thick plate product that requires ultrasonic flaw detection, the reduction ratio given by the ratio of the slab thickness to the product thickness is 3 to 5. The rolling reduction amount per pass of a plate rolling mill is generally about 20 to 50 mm at most, so not only does the number of passes increase, but extra-thick slabs as the material to be rolled require care. Therefore, there are significant disadvantages such as an increase in maintenance loss, a worsening of the heating fuel consumption rate, and a decrease in rolling yield due to deterioration of the planar shape.
また厚板圧延機による圧下量の下でザク状欠か
んを回避すべき全圧下を施す際には、製品板厚が
満足され得ずして連続鋳造スラブを被圧延素材と
して活用するのを妨げる場合すら生じるのであ
る。 In addition, when applying full reduction to avoid chipping under the amount of reduction by a thick plate rolling mill, the product thickness cannot be satisfied, which prevents continuous casting slabs from being used as rolling materials. Even cases occur.
加え、設備の面に関連して従来型式の厚板圧延
機でパス当り圧下量を増すにはモータートルクを
増大する必要があり、これに伴つて圧延ロールス
ピンドルのカツプリングのフランジ径、従つてワ
ークロールを大径化せざるを得ない不利が生じ
る。 In addition, in terms of equipment, it is necessary to increase the motor torque in order to increase the reduction per pass in conventional plate rolling mills. A disadvantage arises in that the diameter of the roll must be increased.
これらの問題点は厚板圧延機によるザク圧着の
負担を、該圧延機のミルライン側に被圧延素材を
その肉厚の向きに圧下する鍛造プレスを配置する
ことにより肩代りさせることによつて有利に解決
される。 To solve these problems, it is advantageous to take over the burden of counter-bonding by a thick plate rolling mill by arranging a forging press on the mill line side of the rolling mill that reduces the material to be rolled in the direction of its wall thickness. resolved to.
すなわち一般にロール圧延によるシエープフア
クタＳfは次式
Ｓf＝ｌｄ／ｈｎ
ｌd：ロール作用長さ（ロール接触弧長さ）
ｈn：該パスの入側、出側平均厚み
ｈn＝ｈ１＋ｈ２／２
h1，h2：該パス圧延前後の板厚
であらわされ、Ｓfが大きい方がザク圧着しやす
いが圧延においては、ｌd≒√で近似され
ここにＲはワークロール半径、Δｈは１パス当り
圧下量であつて、このロール作用長さｌdは通常
高々100〜200mmであるのに対し、鍛造プレスでは
その金敷幅を容易に400〜500mmとなし得てこの金
敷幅はザク圧着に対する寄与が上記ロール作用長
さｌdに比して、より有利に対応するところから
ロール圧延と比べて、より低い圧下量の下で、こ
の発明の目的が一層有利に充足されるわけであ
る。 That is, in general, the shape factor S f due to roll rolling is expressed by the following formula: S f = l d / h n l d : Roll action length (roll contact arc length) h n : Average thickness on the entrance and exit sides of the pass h n = h 1 + h 2 /2 h 1 , h 2 : Expressed by the thickness of the plate before and after the pass rolling, the larger S f is, the easier it is to crimp, but in rolling, it is approximated by l d ≒√, where R is the work roll The radius, Δh, is the amount of rolling reduction per pass, and this roll action length l d is usually at most 100 to 200 mm, whereas in a forging press, the anvil width can easily be 400 to 500 mm. The purpose of the present invention can be more advantageously fulfilled under a lower rolling reduction compared to roll rolling, since the contribution of the width to the uneven crimping corresponds more favorably than the roll action length l d . That's why.
なお鍛造プレスによる被圧延素材の肉厚圧下
は、はじめに触れた鍛造スラブでも同様な圧下が
加えられて、高級鋼の極厚板の製造に供された事
例もあるけれども、通常厚板工場は鍛造工場から
離隔しているため、厚板工場での再加熱やハンド
リングの費用の面で一般的とは云い難く、ここに
この発明で所期するところには適合しない。 Although there are cases where a forging press is used to reduce the thickness of the material being rolled, similar reductions have been applied to the forged slabs mentioned at the beginning and used to manufacture extra-thick plates of high-grade steel, plate factories usually use forging. Because it is far away from the factory, it is difficult to say that it is common in terms of reheating and handling costs at plate factories, and it is not suitable for the purpose of the present invention.
さてこの発明は、厚板の圧延に先立つて被圧延
素材をその肉厚の向きにその全幅にわたる金敷を
もつ鍛造プレスにより長手方向区分毎にくり返し
圧下し、しかるのち圧延を行う厚板の圧延方法で
あり、この圧延方法の実施に直接使用すべく、厚
板圧延機のミルライン入側に被圧延素材をその肉
厚の向きに圧下する鍛造プレスを配置してなる厚
板圧延設備であつて、これらを上述した従来技術
の問題点の解決手段とするものである。 The present invention provides a method for rolling a thick plate in which, prior to rolling a thick plate, the material to be rolled is repeatedly rolled in each longitudinal section using a forging press having an anvil extending over the entire width in the direction of the wall thickness, and then rolled. In order to be used directly for carrying out this rolling method, a plate rolling equipment is provided in which a forging press for rolling down the material to be rolled in the direction of its wall thickness is arranged at the entrance side of the mill line of the plate rolling machine, These are intended to solve the problems of the prior art described above.
なお特定発明の実施態様としては、鍛造プレス
による圧下比を1.5以上に選ぶこと、鍛造プレス
による被圧延素材の全長に及ぶくり返し圧下を１
圧延ピツチ内に完了させること、長手方向区分幅
を400〜500mmに定めることあるいは、それらの併
用がとくに有利であり、また圧延設備について
は、鍛造プレスの配置を厚板圧延機のミルライン
の方向に沿う複数基の配列にすること、また厚板
圧延機のミルライン上で鍛造プレスの入側にスケ
ールブレークデバイスの配置を含むものとし、さ
らには厚板圧延機ミルライン上で厚板圧延機と鍛
造プレスとの間に被圧延素材の再加熱ヒーターを
含むものとすることができる。 In addition, as an embodiment of the specific invention, the reduction ratio by the forging press is selected to be 1.5 or more, and the repeated reduction over the entire length of the material to be rolled by the forging press is 1.
It is particularly advantageous to complete the work within the rolling pitch, to set the longitudinal section width to 400-500 mm, or to use a combination of these; It shall also include the placement of scale break devices on the entry side of the forging press on the mill line of the plate rolling mill, and the arrangement of multiple units along the plate rolling mill line. A heater for reheating the material to be rolled may be included in between.
一般に分塊スラブ、連続鋳造スラブの何れを問
わず厚板圧延に供する被圧延素材は、ほぼ1.5〜
5m長さであり、上掲のように金敷幅を被圧延材
に加える長手方向の圧下区分幅に対応する400〜
500mm程度に選ぶことによつて先行する被圧延素
材に圧延ロール加工を施している１圧延ピツチ内
に、次の被圧延素材についての十分な圧下比の下
でほぼ完全なザク圧着を達成することができる。
なおスラブがとくに長大なとき、必要に応じて鍛
造プレスを圧延機ミルラインに沿つて複数基を列
設する配列とすることができる。 In general, the rolled material used for thick plate rolling, whether it is a blooming slab or a continuous casting slab, is approximately 1.5 to 1.5
It is 5m long and corresponds to the width of the rolling section in the longitudinal direction when the anvil width is added to the rolled material as shown above.
By selecting a diameter of about 500 mm, almost complete crimp crimping can be achieved with a sufficient rolling ratio for the next rolled material within one rolling pitch where the preceding rolled material is subjected to rolling roll processing. Can be done.
Note that when the slab is particularly long, a plurality of forging presses may be arranged in a row along the rolling mill line as necessary.
スケールブレークデバイスは、被圧延素材を加
熱炉にて均熱した際に生じたスケールを、鍛造プ
レスにかける前に除去するために使用する。 The scale break device is used to remove scale generated when the material to be rolled is soaked in a heating furnace before being applied to a forging press.
再加熱ヒーターはインダクシヨンヒーターによ
る誘導加熱、その他、輻射加熱などを使用して金
敷にて、被加熱素材を鍛造プレスする際に生じた
表面温度の低下を補う必要がある場合に行うので
ある。 Reheating heaters are used when it is necessary to compensate for the drop in surface temperature that occurs when the material to be heated is forged and pressed using an anvil using induction heating using an induction heater, or radiation heating.
第１図はこの発明に従う可逆式厚板圧延機４の
ミルラインの配置を示し、１は加熱炉、２はスケ
ールブレークデバイス、３は鍛造プレス、４は圧
延機である。この例で厚み310mm×幅1900mm×長
さ2500mmスラブSS41相当材をスケールブレーク
デバイス２で表面のスケールを除去した後その肉
厚の向きに、その全幅にわたる金敷をもつ１万ト
ン油圧鍛造プレス３によつてその長手方向区分毎
にくり返し圧下し、圧下比1.55で厚さ200mm×幅
1900mm×長さl1mmに圧下したのち、次のパススケ
ジユールにて圧延機４にかけ、幅出しパス、減厚
パスおよび整形パスを経て、厚み130mm×幅2500
mm×長さl2mmの厚板に仕上げた。 FIG. 1 shows the arrangement of mill lines of a reversible plate rolling mill 4 according to the present invention, where 1 is a heating furnace, 2 is a scale break device, 3 is a forging press, and 4 is a rolling mill. In this example, a slab equivalent to SS41 with a thickness of 310 mm x width of 1900 mm x length of 2500 mm is removed from the surface scale using a scale break device 2, and then placed in a 10,000-ton hydraulic forging press 3 with an anvil spanning the entire width in the direction of the wall thickness. Then, each section in the longitudinal direction is rolled down repeatedly to a thickness of 200 mm x width at a rolling ratio of 1.55.
After rolling down to 1900 mm x length l 1 mm, it is rolled to rolling mill 4 in the next pass schedule, and after passing through a tentering pass, a thickness reduction pass, and a shaping pass, it is rolled to a thickness of 130 mm x width 2500 mm.
It was finished into a thick plate of mm x length l 2 mm.
パススケジユール
パスNo. 厚み
１ …………190mm
２ …………180mm
３ …………170mm
４ …………160mm
５ …………155mm
６ …………150mm
ターン
（回転）
７ …………140mm
８ …………130mm
かくして、得られた厚板は、ザク状欠かんはな
く、品質も良好であつた。 Pass schedule Pass No. Thickness 1 …………190mm 2 …………180mm 3 …………170mm 4 …………160mm 5 …………155mm 6 …………150mm Turn (rotation) 7 …… …140mm 8 …130mm The thick plate thus obtained had no pitting and was of good quality.
第２図は第１図同様の圧延機のミルラインの配
置を示し、１〜４は前述したとおりであり、５は
再加熱ヒーターである。 FIG. 2 shows the arrangement of mill lines of a rolling mill similar to FIG. 1, where 1 to 4 are as described above, and 5 is a reheating heater.
この例で厚み400mm×幅1900mmの長さ2300mmの
スラブSS41相当材につき、１万トン油圧鍛造プ
レス３によつて前述同様にくり返し圧下比1.6
で、厚み250mm×幅1900mm×長さl3mm圧下したの
ち、前記鍛造プレス４する際に生じた表面温度の
低下を補うためにその被圧延処理材についてイン
ダクシヨンヒーターによつて、誘導加熱したのち
下記パススケジユールで圧延機４にかけ、幅出し
パス、減厚パスおよび整形パスを経て厚み170mm
×幅2450mm×長さl4mmの厚板に仕上げた。 In this example, a slab equivalent to SS41 with a thickness of 400 mm x width of 1900 mm and length of 2300 mm is repeatedly rolled using the 10,000-ton hydraulic forging press 3 in the same manner as described above with a reduction ratio of 1.6.
After rolling down the material to a thickness of 250 mm x width of 1900 mm x length of 3 mm, the material to be rolled was heated by induction using an induction heater to compensate for the decrease in surface temperature that occurred during the forging press 4. Afterwards, it is passed through the rolling mill 4 according to the following pass schedule, and after passing through the tentering pass, thickness reduction pass, and shaping pass, it is rolled to a thickness of 170mm.
Finished in a thick plate with a width of 2450 mm and a length of 4 mm.
パススケジユール
パスNo. 厚み
１ …………235mm
２ …………220mm
３ …………210mm
４ …………200mm
５ …………195mm
６ …………190mm
ターン
（回転）
７ …………180mm
８ …………170mm
得られた厚板製品はザク状欠かんはなく、品質
も良好であつた。 Pass schedule Pass No. Thickness 1 …………235mm 2 …………220mm 3 …………210mm 4 …………200mm 5 …………195mm 6 …………190mm Turn (rotation) 7 …… …180mm 8 …170mm The obtained thick plate product had no pitting and was of good quality.
上記のようにして、この発明によれば厚板圧延
機のミルライン入側に配置した鍛造プレスによ
り、従来圧下比不足に由来して、しばしば残存し
勝ちなザクをほぼ完全に圧着して厚板製品のザク
状欠かんを有利に回避することが可能であり、こ
の鍛造プレスはとくに厚板圧延機ミルライン入側
に配置することにより、製造コストの低減が容易
に図れるほか、厚板製品に加えられた鍛造および
圧延により結晶粒の微細化をもたらして、強度、
靭性その他鋼質の改善も可能である。 As described above, according to the present invention, the forging press placed on the inlet side of the mill line of a thick plate rolling mill almost completely crimps the dents that often remain due to the insufficient rolling reduction ratio in the thick plate. It is possible to advantageously avoid chipping of the product, and by placing this forging press especially on the entrance side of the mill line of a plate rolling mill, it is possible to easily reduce manufacturing costs, and also to process thick plate products. The forging and rolling process results in grain refinement, which increases strength and
It is also possible to improve toughness and other steel properties.
第１図、第２図はこの発明の実施に使用する各
別実施例に例示した平面図である。
１……加熱炉、３……鍛造プレス、４……圧延
機、５……再加熱ヒーター。
FIGS. 1 and 2 are plan views illustrating different embodiments used for carrying out the present invention. 1... Heating furnace, 3... Forging press, 4... Rolling machine, 5... Reheating heater.
Claims (1)
その肉厚の向きに圧下する鍛造プレスを配置して
成る厚板圧延設備。1. A thick plate rolling equipment consisting of a forging press that reduces the material to be rolled in the direction of its wall thickness on the inlet side of the mill line of a thick plate rolling mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18095281A JPS5884603A (en) | 1981-11-13 | 1981-11-13 | Rolling installation for thick plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18095281A JPS5884603A (en) | 1981-11-13 | 1981-11-13 | Rolling installation for thick plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5884603A JPS5884603A (en) | 1983-05-20 |
| JPS6254561B2 true JPS6254561B2 (en) | 1987-11-16 |
Family
ID=16092140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18095281A Granted JPS5884603A (en) | 1981-11-13 | 1981-11-13 | Rolling installation for thick plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5884603A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010149141A (en) * | 2008-12-25 | 2010-07-08 | Daido Steel Co Ltd | Method for manufacturing large-diameter product from large-section cast slab |
| JP5838801B2 (en) * | 2011-12-27 | 2016-01-06 | Ｊｆｅスチール株式会社 | Thick steel plate and method for manufacturing thick steel plate |
-
1981
- 1981-11-13 JP JP18095281A patent/JPS5884603A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5884603A (en) | 1983-05-20 |
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