JPS6317566B2 - - Google Patents
Info
- Publication number
- JPS6317566B2 JPS6317566B2 JP54105573A JP10557379A JPS6317566B2 JP S6317566 B2 JPS6317566 B2 JP S6317566B2 JP 54105573 A JP54105573 A JP 54105573A JP 10557379 A JP10557379 A JP 10557379A JP S6317566 B2 JPS6317566 B2 JP S6317566B2
- Authority
- JP
- Japan
- Prior art keywords
- slab
- tip
- cutting
- cut
- sharpness
- 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
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- 238000005520 cutting process Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Shearing Machines (AREA)
Description
【発明の詳細な説明】
本発明は連続鋳造鋳片のような高温の鋼スラブ
に、環状突起部を有するロールを用いて溝付き圧
延してその長手方向に分割切断する鋼スラブの切
断方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting a high-temperature steel slab, such as a continuously cast slab, in which a roll having an annular protrusion is used to roll a high-temperature steel slab with grooves and cut the slab into segments in the longitudinal direction. It is something.
高温の鋼スラブ(以下単にスラブという)を断
面がくさび状の環状突起部を有するロールを用い
て、スラブに溝を圧延し該溝部にそつてスラブを
切断する方法は従来より知られている。この切断
方法は、環状突起部にてスラブを完全に切離すこ
と、或は切離さずに部分的に溝を圧延することが
可能である。後者の場合には溝部にそつてガス切
断法、その他の機械的な方法によつて切離すこと
ができる。 BACKGROUND ART A method is conventionally known in which a high-temperature steel slab (hereinafter simply referred to as a slab) is rolled into a groove using a roll having an annular protrusion having a wedge-shaped cross section, and the slab is cut along the groove. With this cutting method, it is possible to completely separate the slab at the annular protrusion, or to partially roll a groove without separating the slab. In the latter case, it can be separated along the groove by gas cutting or other mechanical methods.
この切断方法は連続鋳造鋳片の幅切断に用いる
と特に有効である。即ち、この方法の採用により
連鋳機では広幅の単一サイズスラブを鋳造し、そ
の後に幅切断して種々のサイズのスラブまたはブ
ルームを製造することができるから、平均鋳造ス
ラブ幅を大きくすることができ、また、鋳型の幅
変更の回数を減らせるので、連鋳機の鋳造効率を
増大させることが可能である。 This cutting method is particularly effective when used to cut the width of continuously cast slabs. That is, by adopting this method, the continuous caster can cast a single wide slab of a single size, and then cut the width to produce slabs or blooms of various sizes, thereby increasing the average cast slab width. In addition, since the number of times the width of the mold is changed can be reduced, it is possible to increase the casting efficiency of the continuous casting machine.
しかして、この環状突起部を付したロールによ
る切断方法において留意すべきことは、被切断
スラブの断面に生ずるバリを最小限に抑えるこ
と、被切断スラブの切断時曲りを小さく抑える
こと、切断機のミルパワーをできるだけ小さく
すること、であり、従来のこの種の切断方法では
必ずしもこれらの点をすべて満足させるものでは
なかつた。本発明はこれらの問題の解決策を与え
るものである。 However, in the cutting method using a roll with an annular protrusion, it is important to keep in mind that the burrs that occur on the cross section of the slab to be cut should be minimized, that the bending of the slab to be cut be kept to a minimum, and that the cutting machine The aim is to reduce the mill power as much as possible, and conventional cutting methods of this type have not always been able to satisfy all of these points. The present invention provides a solution to these problems.
本発明は上述の如く切断曲り、バリの発生を防
止すると共に、ミルパワーを小さく抑えることが
できる鋼スラブの切断方法を提供することを目的
とする。 An object of the present invention is to provide a method for cutting a steel slab that can prevent cutting bending and burrs from occurring as described above, and can keep mill power low.
この目的を達成するための本発明の切断法は、
環状突起部の両側の側壁の夫々の上下両端を結ぶ
2本の弦のなす角度(θ)が10゜〜80゜の範囲にあ
り、さらに該環状突起部の先端が、その断面の最
下端位置より被切断鋼スラブの最大厚hoの0.02倍
垂直上方レベルの弦の長さ(ε)が0.05hoを超え
ないような先端尖鋭度を有するロールにて、鋼ス
ラブを切断することを特徴とする。 The cutting method of the present invention to achieve this objective is as follows:
The angle (θ) formed by the two chords connecting the upper and lower ends of the side walls on both sides of the annular projection is in the range of 10° to 80°, and the tip of the annular projection is at the lowest end of its cross section. The steel slab is cut by a roll having a tip sharpness such that the chord length (ε) at the vertically upper level does not exceed 0.02 times the maximum thickness ho of the steel slab to be cut, and 0.05 ho. .
このような角度と先端尖鋭度をもつように形成
した環状突起部を有するロールによりスラブを溝
付き圧延すると、バリ、曲り、ミルパワーのいず
れをも小さく抑えることができる。 When a slab is rolled with a groove using a roll having an annular protrusion formed with such an angle and tip sharpness, burrs, bending, and mill power can all be suppressed to a small level.
以下本発明の詳細を説明する。 The details of the present invention will be explained below.
上記のバリ、曲り、ミルパワーは主として、環
状突起部の断面形状及びパススケジユールの影響
を受ける。パススケジユールについては発明者等
は先に特許出願を行なつている。(特願昭54−
27693)
環状突起部の断面形状に関しては、くさび形状
のマクロ的な角度、及び先端付近の尖鋭度合が重
要な要素である。 The above-mentioned burrs, bends, and mill power are mainly affected by the cross-sectional shape and pass schedule of the annular protrusion. The inventors have already filed a patent application for the pass schedule. (Special application 1972-
27693) Regarding the cross-sectional shape of the annular protrusion, important factors are the macroscopic angle of the wedge shape and the degree of sharpness near the tip.
マクロ的なくくさび角度については、突起部断
面の両側部分が直線であつたり、または軽く湾曲
していたり種々の場合が考えられるので、ここで
は統一的に第1図に示すように、突起部の最先端
の点11,11′,11″と突起部の付け根の2点
12,12′,12″、13,13′,13″を結ん
だ2本の線分のなす角度をくさび角度と定義す
る。第1図のaは両側部分が直線の場合、bは両
側部分が凸型曲線の場合、cは両側部分が凹型曲
線の場合であるが、夫々図中のθ,θ′,θ″でくさ
び角度を定義する。 Regarding the macroscopic wedge angle, there are various possible cases where both sides of the cross section of the protrusion are straight or slightly curved, so here we will uniformly define the wedge angle of the protrusion as shown in Figure 1. The wedge angle is defined as the angle formed by two line segments connecting the most extreme point 11, 11', 11'' and the two points 12, 12', 12'', 13, 13', 13'' at the base of the protrusion. In Fig. 1, a is a case where both sides are straight lines, b is a case where both side parts are convex curves, and c is a case where both side parts are concave curves. defines the wedge angle.
このくさび角度が大きすぎると溝圧延中の反
力、トルクが大きくなりすぎたり、被切断金属材
の曲りや延伸が大きくなりすぎたりする。また、
くさび角度が小さ過ぎると、突起部の耐久性が低
下する。このためくさび角度は適正範囲内にしな
ければならないが、実験によればスラブの変形強
度、ロール材質等により変化し、およそ10゜〜80゜
の範囲内にある。 If this wedge angle is too large, the reaction force and torque during groove rolling will become too large, and the metal material to be cut will be bent or stretched too much. Also,
If the wedge angle is too small, the durability of the protrusion will be reduced. For this reason, the wedge angle must be within an appropriate range, but experiments have shown that it varies depending on the deformation strength of the slab, the roll material, etc., and is within the range of approximately 10° to 80°.
次に突起部先端付近の尖鋭度であるが、本発明
は主としてこの点が最重要のものである。なお、
以下の説明では被切断材として連続鋳造鋳片を用
いた例で説明する。 Next, the sharpness near the tip of the protrusion is the most important point in the present invention. In addition,
In the following explanation, an example will be explained in which a continuously cast slab is used as the material to be cut.
環状突起部断面の先端形状は鈍いほど、バリ、
切断曲り、及びミルパワーが大きくなる。すなわ
ち、第2図は鋳片断面を示すが、1,2,3,4
は切断分離した鋳片である。ロールの環状突起部
先端が鈍いとバリが5,6のように大きくなる
が、先端形状を鋭くすれば、バリの形状は7,8
の如く小さくなり、後工程での疵になりにくい。 The blunter the tip shape of the cross section of the annular protrusion, the more likely it is to have burrs,
Cutting curvature and mill power increase. In other words, although Fig. 2 shows the cross section of the slab, 1, 2, 3, 4
is the slab that has been cut and separated. If the tip of the annular protrusion of the roll is blunt, the burr will be large as shown in numbers 5 and 6, but if the tip is made sharp, the shape of the burr will be 7 and 8.
It becomes smaller and less prone to scratches in later processes.
第3図は切断時鋳片の曲りを示す。9は切断前
鋳片、10,14は切断後鋳片であるが、環状突
起部の先端形状が鈍い場合は10のように切断鋳
片の曲りが大きくなるが、先端を鋭くすることに
よつて14の如く曲りを抑えることができる。こ
れは突起部の先端を鋭くすることにより、圧延溝
底部の形状も鋭くなり、ロールによる切断分離パ
スにおいて応力集中が起りやすくなるため、鋳片
が溝にそつて容易に切断することになり、切断鋳
片曲りが小さくなるためと考えられる。 Figure 3 shows the bending of the slab during cutting. 9 is a slab before cutting, and 10 and 14 are slabs after cutting.If the tip of the annular protrusion is blunt, the curve of the cut slab becomes large as shown in 10, but by making the tip sharp, As shown in Fig. 14, bending can be suppressed. This is because by sharpening the tips of the protrusions, the shape of the bottom of the rolling groove also becomes sharper, making stress concentration more likely to occur during the cutting and separation pass by the rolls, making it easier for the slab to be cut along the groove. This is thought to be because the bending of the cut slab becomes smaller.
第4図はこの様子を示すもので、a図の15は
先端が鈍い場合で、右方に示す応力分布の如く、
応力集中が余り顕著でないが、b図の16は先端
が鋭い場合で、右方に示す如く応力集中が顕著に
なり、切断パスにおいて容易に溝部が分離する。 Figure 4 shows this situation, and 15 in figure a is the case where the tip is blunt, as shown in the stress distribution shown on the right.
Although the stress concentration is not so remarkable, 16 in Fig. b is a case where the tip is sharp, and as shown on the right, the stress concentration becomes remarkable, and the groove part easily separates during the cutting pass.
以上に先端近傍の尖鋭度の影響を定性的に記し
たが、定量的に述べるためには先端付近尖鋭度を
定義する必要がある。 The influence of the sharpness near the tip has been described qualitatively above, but in order to describe it quantitatively, it is necessary to define the sharpness near the tip.
環状突起部断面の先端部は、直線状であつた
り、円弧その他の曲線であつたり、様々な場合が
考えられるので、尖鋭度合の定義として一概に先
端部の曲率をもつてあてることはできず、むしろ
被切断材の切断特性に及ぼす効果を総合的に勘案
して決めなければならない。 The tip of the cross-section of the annular protrusion can be linear, arcuate or other curved, and various cases can be considered, so the degree of sharpness cannot be defined in terms of the curvature of the tip. Rather, it must be determined by comprehensively considering the effect on the cutting characteristics of the material to be cut.
そこで、尖鋭度の指標としては、第5図に示す
ごとく、突起部最外周レベル23より一定距離δ
だけ上方の内側レベルの水平線24によつて切り
取られる弦の長さεが、鋳片切断に伴なう曲り、
バリ、ミルパワーと関係が深く、指標として適切
であることが本発明者等によつて見出された。 Therefore, as an index of sharpness, as shown in FIG.
The length ε of the chord cut by the horizontal line 24 at the inner level above the bending caused by cutting the slab,
The present inventors have discovered that burr is closely related to mill power and is suitable as an indicator.
上記一定距離δの大きさとしては、0.005ho(ho
は鋳片の厚み)程度より小さいと、εが先端付近
を表す曲線の僅かな変化の差によつてまた切断に
伴なう先端付近の摩耗によつて、大きく変動し、
安定した指標にはなりにくいことは、容易に推定
される通りである。 The size of the above constant distance δ is 0.005ho (ho
If ε is smaller than the thickness of the slab, ε will vary greatly due to the slight difference in the change in the curve representing the vicinity of the tip and due to the wear near the tip due to cutting,
As can be easily surmised, it is difficult to establish a stable indicator.
またδの大きさとして、0.2ho程度以上をとれ
ば、εは先の第1図のくさび角θとほぼ一対一に
対応し、突起部断面のマクロ的な形状を表す指標
とはなり得ても、先端付近の尖鋭度を代表する指
標とはなり得ない。 Furthermore, if the size of δ is approximately 0.2ho or more, ε corresponds almost one-to-one to the wedge angle θ shown in Fig. 1, and can serve as an index representing the macroscopic shape of the cross section of the protrusion. However, it cannot be used as a representative index of the sharpness near the tip.
本発明者等は切断鋳片のバリの大きさ等から判
断してδの適正値として、0.02hoを採用し、これ
をもとに指標を作成し、実験データを整理したと
ころ、バリ、曲り、ミルパワーの値との良好な対
応を得たので、この値を基準として用いる。 The inventors adopted 0.02ho as the appropriate value for δ, judging from the size of burrs on cut slabs, created an index based on this, and organized experimental data. Since we obtained a good correspondence with the value of mill power, we use this value as a reference.
第6図は上記指標ε(突起部先端レベルより
0.02ho内側レベルの弦の長さ)を横軸にとり、縦
軸に切断鋳片6m当たりの曲り量η(第3図参照)
をとり、実験値をプロツトしたものであるが、こ
の図からも、先端の尖鋭度が曲り量に大きく影響
を与えることがわかる。 Figure 6 shows the above index ε (from the protrusion tip level).
The horizontal axis is the length of the chord at the inner level of 0.02ho, and the vertical axis is the bending amount η per 6 m of cut slab (see Figure 3).
This figure shows that the sharpness of the tip greatly affects the amount of bending.
第7図は先端尖鋭度指標εを横軸に、縦軸とし
て圧延反力をプロツトしたものであり、先端尖鋭
度が鋭くなると、反力が小さくなることがわか
る。 FIG. 7 plots the rolling reaction force with the tip sharpness index ε on the horizontal axis and the vertical axis, and it can be seen that as the tip sharpness becomes sharper, the reaction force becomes smaller.
切断鋳片の後工程における圧延を支障なく行な
うための曲り許容限界は、ほぼ40mmであるから、
これに対応する先端尖鋭度0.05hoを実用的限界尖
鋭度として発明者等は採用した。すなわち、突起
部先端レベルより0.02ho内側レベルの弦の長さε
が0.05hoを超えると、切断鋳片の曲りが量が大き
くなりすぎて実用上支障がある。 The allowable bending limit for the cut slab to be rolled in the subsequent process without any problems is approximately 40 mm.
The inventors adopted a tip sharpness of 0.05ho corresponding to this as the practical limit sharpness. In other words, the length of the string ε at the level 0.02ho inside from the level of the tip of the protrusion
If it exceeds 0.05ho, the amount of bending of the cut slab becomes too large, which is a practical problem.
また、切断が鋳片内質に与える影響についてで
あるが、突起部先端を刃物の如く極端に鋭くすれ
ば鋳片内質の露出が心配されるが、上記程度の尖
鋭度では、露出は見られなかつた。 Regarding the effect of cutting on the internal quality of the slab, if the tip of the protrusion is made extremely sharp like a knife, there is a concern that the internal quality of the slab will be exposed. I couldn't help it.
先端尖鋭度の定義は上記の外にも種々の方法が
考えられるが、どのような定義を採用するにし
ろ、実際の突起部形状が上記方式により規定した
範囲内であれば、本発明の趣旨に反するものでな
いこと勿論である。 Various methods can be considered for defining the tip sharpness in addition to the above method, but no matter what definition is adopted, as long as the actual shape of the protrusion is within the range defined by the above method, the purpose of the present invention is met. Of course, it is not contrary to this.
以上説明した如く本発明方法によれば、連続鋳
造鋳片のような高温の鋼スラブを何等の支障を生
ずることなく効率良く切断分離することができる
ことから、その産業上寄与するところ極めて大で
ある。 As explained above, according to the method of the present invention, high-temperature steel slabs such as continuously cast slabs can be efficiently cut and separated without any hindrance, and therefore its contribution to industry is extremely large. .
第1図a、b、cはロールの環状突起部の断面
形状の種々の例を示す説明図、第2図は切断鋳片
のバリ形状を示す説明図、第3図は切断鋳片の間
借りを説明するための平面図、第4図a、bは鋳
片切断時の応力分布を示す説明図、第5図は本発
明方法において用いるロールの環状突起部の先端
尖鋭度を説明するための図、第6図は内側レベル
の弦の長さεと鋳片間借り量との関係を示す図
表、第7図は内側レベルの弦の長さεと圧延反力
との関係を示す図表である。
Figures 1 a, b, and c are explanatory diagrams showing various examples of cross-sectional shapes of the annular protrusion of the roll, Figure 2 is an explanatory diagram showing the burr shape of the cut slab, and Figure 3 is an explanatory diagram showing the burr shape of the cut slab. 4a and 4b are explanatory diagrams showing the stress distribution during cutting of slabs, and FIG. 5 is a plan view for explaining the tip sharpness of the annular projection of the roll used in the method of the present invention. Figure 6 is a diagram showing the relationship between the length of the chord at the inner level ε and the slab clearance amount, and Figure 7 is a diagram showing the relationship between the length ε of the chord at the inner level and the rolling reaction force. .
Claims (1)
て溝付き圧延して鋼スラブ長手方向に分割切断す
る方法において、 該環状突起部の両側の側壁の夫々の上下両端を
結ぶ2本の弦のなす角度(θ)が10゜〜80゜の範囲
にあり、さらに該環状突起部の先端が、その断面
の最下端位置より被切断鋼スラブの最大厚hoの
0.02倍垂直上方レベルの弦の長さ(ε)が0.05ho
を超えないような先端尖鋭度を有するロールに
て、鋼スラブを切断することを特徴とする鋼スラ
ブの切断方法。[Claims] 1. A method of rolling a steel slab with grooves using a roll having an annular protrusion and cutting the steel slab into pieces in the longitudinal direction, comprising: connecting the upper and lower ends of the side walls on both sides of the annular protrusion; The angle (θ) between the two strings is in the range of 10° to 80°, and the tip of the annular protrusion is located at the maximum thickness ho of the steel slab to be cut from the lowest end of its cross section.
0.02 times vertical upper level chord length (ε) is 0.05ho
1. A method for cutting a steel slab, comprising cutting the steel slab with a roll having a sharpness of the tip not exceeding .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10557379A JPS5633222A (en) | 1979-08-21 | 1979-08-21 | Cutting apparatus for metallic plate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10557379A JPS5633222A (en) | 1979-08-21 | 1979-08-21 | Cutting apparatus for metallic plate |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5633222A JPS5633222A (en) | 1981-04-03 |
JPS6317566B2 true JPS6317566B2 (en) | 1988-04-14 |
Family
ID=14411256
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10557379A Granted JPS5633222A (en) | 1979-08-21 | 1979-08-21 | Cutting apparatus for metallic plate |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5633222A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5440232A (en) * | 1977-07-04 | 1979-03-29 | British Steel Corp | Method and apparatus for forming devided groups of metallic works |
JPS5448389A (en) * | 1977-03-31 | 1979-04-16 | Kampf Maschf Erwin | Cutter of foils or strips |
-
1979
- 1979-08-21 JP JP10557379A patent/JPS5633222A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5448389A (en) * | 1977-03-31 | 1979-04-16 | Kampf Maschf Erwin | Cutter of foils or strips |
JPS5440232A (en) * | 1977-07-04 | 1979-03-29 | British Steel Corp | Method and apparatus for forming devided groups of metallic works |
Also Published As
Publication number | Publication date |
---|---|
JPS5633222A (en) | 1981-04-03 |
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