JP2011073007A - Method of straightening tapered steel plate thickness of which is varied into tapered shape in longitudinal direction - Google Patents

Method of straightening tapered steel plate thickness of which is varied into tapered shape in longitudinal direction Download PDF

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JP2011073007A
JP2011073007A JP2009224051A JP2009224051A JP2011073007A JP 2011073007 A JP2011073007 A JP 2011073007A JP 2009224051 A JP2009224051 A JP 2009224051A JP 2009224051 A JP2009224051 A JP 2009224051A JP 2011073007 A JP2011073007 A JP 2011073007A
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thickness
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steel plate
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JP5500577B2 (en
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Atsushi Aizawa
敦 相沢
Shinobu Kano
忍 狩野
Atsushi Kurobe
淳 黒部
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Nippon Steel Nisshin Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain uniform straightening effect over entire length of a steel plate even when the length of the tapered part is shorter as compared with the distance between the inlet-side roller and the outlet-side roller of a roller leveler when straightening the tapered steel plate the thickness of which is continuously varied in the longitudinal direction by using the roller leveler. <P>SOLUTION: When straightening the tapered steel plate the thickness of which is continuously varied in the longitudinal direction by using the roller leveler, proper gap between the inlet side roller and the outlet side roller corresponding to the thickness in the thickest portion is calculated and the entire length is straightened by setting the gap between the inlet side roller and the outlet side roller to the calculated value. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、長手方向に板厚がテ−パ状に変化したテ−パ鋼板のロール間ギャップを設定する矯正方法に関する。   The present invention relates to a correction method for setting a gap between rolls of a taper steel plate whose thickness changes in a taper shape in the longitudinal direction.

圧延機で圧延された板状の圧延材をローラレベラで矯正する際には、オペレータが圧延スケジュールのテーブルの目標板厚から手動操作により、レベリングロール間のギャップを設定する方法により実施されるのが一般的である。また、特許文献1に開示されているように、矯正の精度向上のため、レベラに入る前の圧延材の板厚を検出手段により検出し、その信号をレベリングロール制御手段に入力して、レベラのレベリングロール間のギャップを板厚に応じて適正な値に設定すべくレベリングロール作業手段を制御するようにした方法がある。   When a plate-like rolled material rolled by a rolling mill is corrected with a roller leveler, the operator manually implements a method for setting a gap between leveling rolls from a target plate thickness of a table in a rolling schedule. It is common. Further, as disclosed in Patent Document 1, in order to improve the accuracy of correction, the thickness of the rolled material before entering the leveler is detected by the detection means, and the signal is input to the leveling roll control means, and the leveler There is a method in which the leveling roll working means is controlled to set the gap between the leveling rolls to an appropriate value according to the plate thickness.

ところで、構造物の軽量化,材料費の低減,溶接工程の省略等の観点から、長手方向で板厚がテーパ状に変化するように圧延されたテーパ鋼板が用いられている。
しかしながら、上記した特許文献1の方法では、テーパ鋼板を対象とする場合には、適正なロール間ギャップが板厚により異なるため、良好な矯正を行うことは困難である。
そこで、ローラレベラを用いて長手方向に板厚が連続的に変化するように圧延されたテーパ鋼板を矯正する際に、前記圧延機出側で得られた鋼板長手方向の板厚分布情報に基づいて、前記ローラレベラの入側位置および出側位置を通過するテーパ鋼板の板厚を決定し、この板厚に応じて前記ローラレベラの入側および出側のロール間ギャップを連続的に制御する矯正方法が特許文献2で提案されている。
By the way, from the viewpoint of reducing the weight of the structure, reducing the material cost, omitting the welding process, and the like, a tapered steel plate rolled so that the plate thickness changes in a taper shape in the longitudinal direction is used.
However, in the method of Patent Document 1 described above, when a tapered steel plate is targeted, it is difficult to perform good correction because an appropriate gap between rolls varies depending on the plate thickness.
Therefore, when correcting a tapered steel sheet rolled so that the sheet thickness continuously changes in the longitudinal direction using a roller leveler, based on the sheet thickness distribution information in the longitudinal direction of the steel sheet obtained on the delivery side of the rolling mill. A correction method for determining a plate thickness of the tapered steel plate passing through the inlet side position and the outlet side position of the roller leveler and continuously controlling the gap between the rollers on the inlet side and the outlet side of the roller leveler according to the plate thickness. This is proposed in Patent Document 2.

特開昭61−249626号公報JP-A 61-249626 特開平7‐178455号公報Japanese Patent Laid-Open No. 7-178455

特許文献2で提案されている方法により、ローラレベラの入側ロールと出側ロール間の距離に比べてテーパ部の長さが長い場合には、鋼板長手方向における各位置での板厚に応じて所定のロール間ギャップが得られ、鋼板全長にわたって均一な矯正効果を得ることが可能である。
しかし、ローラレベラの入側ロールと出側ロール間の距離に比べてテーパ部の長さが短い場合には、ロール間ギャップが入側ロールからの距離に応じて線形的に変化するのに対して板厚変化の方向が入側ロールと出側ロール間で変わるので、入側ロールおよび出側ロールを通過時には適正なロール間ギャップが得られるが、途中のロールにおいて適正なロール間ギャップが得られず、鋼板全長にわたって均一な矯正効果を得ることが困難である。
According to the method proposed in Patent Document 2, when the length of the taper portion is longer than the distance between the entry side roll and the exit side roll of the roller leveler, depending on the plate thickness at each position in the longitudinal direction of the steel plate A predetermined gap between rolls is obtained, and a uniform straightening effect can be obtained over the entire length of the steel sheet.
However, when the length of the taper portion is shorter than the distance between the entry roll and the exit roll of the roller leveler, the gap between rolls linearly changes according to the distance from the entry roll. Since the direction of change in thickness changes between the entry side roll and the exit side roll, an appropriate gap between the rolls is obtained when passing through the entry side roll and the exit side roll, but an appropriate gap between rolls is obtained in the middle roll. It is difficult to obtain a uniform correction effect over the entire length of the steel sheet.

本発明は、このような問題を解消すべく案出されたものであり、ローラレベラの入側ロールと出側ロール間の距離に比べてテーパ部の長さが短い場合においても、鋼板長手方向における各位置での板厚に応じて所定のロール間ギャップが得られ、鋼板全長にわたって均一な矯正効果を得ることが可能な方法を提供することを目的とする。   The present invention has been devised to solve such a problem, and even in the case where the length of the taper portion is shorter than the distance between the entrance side roll and the exit side roll of the roller leveler, An object is to provide a method in which a predetermined gap between rolls is obtained according to the plate thickness at each position, and a uniform correction effect can be obtained over the entire length of the steel plate.

本発明の長手方向に板厚がテーパ状に変化したテーパ鋼板の矯正方法は、その目的を達成するため、ローラレベラを用いて長手方向に板厚が連続的に変化したテーパ鋼板を矯正する際に、最も厚い部分の板厚に対応した適正な入側および出側のロール間ギャップを算出し、入側および出側のロール間ギャップを前記算出値に設定して全長を矯正することを特徴とする。
そして、前記矯正時に、出側の上ロール下端を下ロール上端よりも上に配置するとともに、上ロール下端と下ロール上端の上下方向距離を最も厚い部分の板厚に等しくするが好ましい。
In order to achieve the purpose of the straightening method of the taper steel sheet in which the plate thickness is changed in a taper shape in the longitudinal direction of the present invention, when correcting the taper steel plate in which the plate thickness is continuously changed in the longitudinal direction using a roller leveler. Calculating an appropriate gap between the rolls on the entry side and the exit side corresponding to the thickness of the thickest portion, and correcting the overall length by setting the gap between the rolls on the entry side and the exit side to the calculated value. To do.
And at the time of the said correction | amendment, it is preferable to arrange | position the upper roll lower end of an outgoing side above a lower roll upper end, and to make the up-down direction distance of an upper roll lower end and a lower roll upper end equal to the plate | board thickness of the thickest part.

本発明においては、各部分の板厚およびロール間ギャップと矯正効果との関係を調査し、最も厚い部分の板厚に対応した適正な入側および出側のロール間ギャップで最も薄い部分を矯正しても矯正効果が顕著には悪化しないという知見に基づいて、最も厚い部分の板厚を基準に入側および出側のロール間ギャップを設定しているので、ローラレベラの入側ロールと出側ロール間の距離に比べてテーパ部の長さが短い場合においても鋼板全長にわたって均一な矯正効果が得られる。   In the present invention, the relationship between the plate thickness of each part and the gap between rolls and the straightening effect is investigated, and the thinnest part is corrected with the appropriate gap between the rolls on the entry and exit sides corresponding to the plate thickness of the thickest part. However, based on the knowledge that the straightening effect does not deteriorate significantly, the gap between the entrance and exit rolls is set based on the thickness of the thickest part, so the entrance and exit rolls of the roller leveler Even when the length of the tapered portion is shorter than the distance between the rolls, a uniform correction effect can be obtained over the entire length of the steel plate.

本発明の調査検討に用いたローラレベラの構成を示す図The figure which shows the structure of the roller leveler used for the investigation examination of this invention ローラレベラを用いて板厚1.1mm(薄肉部板厚に相当)、1.3mm(平均板厚に相当)および1.5mm(厚肉部板厚に相当)の普通鋼を矯正するときの入側インターメッシュ量とL反り量との関係の解析結果を示すグラフInsertion when straightening steel with a roller leveler of 1.1 mm (corresponding to thin plate thickness), 1.3 mm (corresponding to average plate thickness) and 1.5 mm (corresponding to thick plate thickness) The graph which shows the analysis result of the relationship between the side intermesh amount and the L warpage amount 薄肉部板厚基準の適正インターメッシュ量、平均板厚基準の適正インターメッシュ量および厚肉部板厚基準の適正インターメッシュ量で薄肉部板厚(板厚1.1mm)、平均板厚(板厚1.3mm)、厚肉部板厚(板厚1.5mm)の鋼板を矯正するときのL反り量の解析結果を示すグラフThin plate thickness (plate thickness 1.1 mm), average plate thickness (plate thickness) with appropriate intermesh amount based on thin plate thickness, proper intermesh amount based on average plate thickness, and proper intermesh amount based on thick plate thickness Graph showing the analysis result of L warpage when straightening a steel plate with a thickness of 1.3 mm) and a thick part thickness (plate thickness of 1.5 mm)

本発明者らは、ローラレベラの入側ロールと出側ロール間の距離に比べてテーパ部の長さが短い場合においても鋼板全長にわたって均一な矯正効果が得られる矯正方法を種々調査検討した。
その結果、最も厚い部分の板厚を基準に入側および出側のロール間ギャップを設定して全長を矯正することにより、ローラレベラの入側ロールと出側ロール間の距離に比べてテーパ部の長さが短い場合においても鋼板全長にわたって良好な矯正が行えることを見出した。
The present inventors have investigated and studied various straightening methods that can obtain a uniform straightening effect over the entire length of the steel plate even when the length of the taper portion is shorter than the distance between the entry side roll and the exit side roll of the roller leveler.
As a result, by setting the gap between the entrance and exit rolls based on the thickness of the thickest part as a reference, and correcting the overall length, the taper portion of the roller leveler can be compared with the distance between the entrance roll and the exit roll. It has been found that good correction can be performed over the entire length of the steel sheet even when the length is short.

以下に、本発明の実施の形態について、各部分の板厚およびロール間ギャップと矯正効果との関係の調査結果に基づいて詳しく説明する。
一例として、薄肉部板厚1.1mm、厚肉部板厚1.5mmのテーパ鋼板を矯正する場合について、ロール間ギャップの設定方法をレベラ解析モデルによる数値解析で検討した。
図1に本発明の調査検討に用いたローラレベラの構成を示す。上段の9個のロール、下段の10個のロールから構成されており、上段の9個のロールを一体として傾斜状に圧下できるような構造になっている。
Hereinafter, embodiments of the present invention will be described in detail based on the investigation results of the relationship between the plate thickness of each portion, the gap between rolls, and the correction effect.
As an example, in the case of correcting a tapered steel plate having a thickness of 1.1 mm and a thickness of 1.5 mm, a method for setting a gap between rolls was examined by numerical analysis using a leveler analysis model.
FIG. 1 shows the configuration of a roller leveler used for investigation and investigation of the present invention. The upper nine rolls and the lower ten rolls are configured so that the upper nine rolls can be integrally rolled down in an inclined manner.

本ローラレベラを用いて板厚1.1mm(薄肉部板厚に相当)、1.3mm(平均板厚に相当)および1.5mm(厚肉部板厚に相当)の普通鋼を矯正するときの入側インターメッシュ量と1500mm当りの長手方向の反り量(L反り量)との関係の解析結果を図2に示す。なお、インターメッシュ量はロール間ギャップを表すものであり、図1に示したように上ロール下端と下ロール上端の上下方向距離で定義し、上ロール下端が下ロール上端よりも下にある場合を正、上ロール下端が下ロール上端よりも上にある場合を負とする。また、インターメッシュ量設定の考え方として、出側ロールで塑性変形が生じないように出側インターメッシュ量は板厚分開放、すなわち板厚×(−1)とし、反り量が小さくなるように入側インターメッシュ量を設定するのが一般的であるので、出側インターメッシュ量は板厚×(−1)とした。
このとき、板厚1.1mm、1.3mmおよび1.5mmのいずれの場合も適正な入側インターメッシュ量は約0.6mmであった。
When using this roller leveler to straighten plain steel with a thickness of 1.1 mm (corresponding to the thickness of the thin part), 1.3 mm (corresponding to the average thickness) and 1.5 mm (corresponding to the thickness of the thick part) FIG. 2 shows an analysis result of the relationship between the amount of incoming mesh and the amount of warpage in the longitudinal direction per 1500 mm (L warpage amount). In addition, the amount of intermesh represents the gap between rolls, and is defined by the vertical distance between the lower end of the upper roll and the upper end of the lower roll as shown in FIG. 1, and the lower end of the upper roll is below the upper end of the lower roll. Is positive and the lower end of the upper roll is above the upper end of the lower roll. In addition, the concept of setting the intermesh amount is such that the outgoing intermesh amount is open by the plate thickness, that is, the plate thickness x (-1), so that plastic deformation does not occur in the outgoing roll, and the warpage amount is reduced. Since it is common to set the amount of the side mesh, the amount of the exit side mesh is set to plate thickness × (−1).
At this time, the appropriate amount of entry mesh was about 0.6 mm in all cases of plate thickness 1.1 mm, 1.3 mm and 1.5 mm.

次に、算出した薄肉部板厚基準の適正インターメッシュ量(入側0.6mm、出側−1.1mm)、平均板厚基準の適正インターメッシュ量(入側0.6mm、出側−1.3mm)および厚肉部板厚基準の適正インターメッシュ量(入側0.6mm、出側−1.5mm)で薄肉部相当板厚(板厚1.1mm)、平均相当板厚(板厚1.3mm)、厚肉部相当板厚(板厚1.5mm)の鋼板を矯正するときのL反り量の解析結果を図3に示す。薄肉部板厚基準や平均板厚基準の適正インターメッシュ量で矯正する場合には、厚肉部相当板厚(板厚1.5mm)においてL反り量が大きくなる。これは出側ロールで塑性変形するためである。これに対して、厚肉部板厚基準の適正インターメッシュ量で矯正する場合には、いずれの板厚においてもL反り量が小さくなっている。すなわち、テーパ鋼板の矯正にあたっては、厚肉部板厚基準の適正インターメッシュ量で矯正すれば、鋼板全長にわたって良好な矯正が行えることが判明した。   Next, the calculated appropriate intermesh amount based on the thickness of the thin-walled portion (incoming side: 0.6 mm, outgoing side: -1.1 mm), and the appropriate intermesh amount based on the average thickness (incoming side: 0.6 mm, outgoing side: -1) .3mm) and an appropriate intermesh amount on the basis of the thickness of the thick part (0.6mm on the input side, -1.5mm on the output side), the equivalent thickness of the thin part (thickness 1.1mm), the average equivalent thickness (thickness) FIG. 3 shows an analysis result of the amount of L warpage when straightening a steel plate having a thickness of 1.3 mm) and a thick part equivalent thickness (plate thickness of 1.5 mm). When correction is performed with an appropriate intermesh amount based on the thin-wall portion thickness standard or the average plate-thickness standard, the L warp amount increases in the thick-wall equivalent plate thickness (plate thickness of 1.5 mm). This is because plastic deformation occurs at the exit roll. On the other hand, in the case of correcting with an appropriate intermesh amount based on the thick part thickness, the L warpage amount is small at any plate thickness. In other words, it has been found that, when the taper steel sheet is corrected, if the thickness is corrected with an appropriate intermesh amount based on the thickness of the thick part, a good correction can be made over the entire length of the steel sheet.

図1に示したローラレベラを用いて、薄肉部板厚1.1mm,厚肉部板厚1.5mm,薄肉部および厚肉部長さ100mm,テーパ部長さ200mm、板幅250mmの形状に繰り返し圧延したコイル状の普通鋼鋼板を薄肉部板厚基準、平均板厚基準、厚肉部板厚基準の適正インターメッシュ量で矯正した結果を表1に示す。それぞれの適正インターメッシュ量は、前述の「発明を実施するための最良の形態」のところで述べた方法に従って、薄肉部板厚基準の入側0.6mm、出側−1.1mm、平均板厚基準の入側0.6mm、出側−1.3mm、厚肉部板厚基準の入側0.6mm、出側−1.5mmとした。
表中には比較例として、特許文献2による方法で矯正した結果も示している。
Using the roller leveler shown in FIG. 1, it was repeatedly rolled into a shape with a thin part plate thickness of 1.1 mm, a thick part plate thickness of 1.5 mm, a thin part and a thick part length of 100 mm, a taper part length of 200 mm, and a plate width of 250 mm. Table 1 shows the results of correcting the coiled plain steel plate with the appropriate intermesh amount based on the thin part thickness standard, the average thickness standard, and the thick part thickness standard. Each proper intermesh amount is determined according to the method described in the above-mentioned “Best Mode for Carrying Out the Invention”. The standard entrance side was 0.6 mm, the exit side was -1.3 mm, and the thick part plate thickness standard entrance side was 0.6 mm and exit side was -1.5 mm.
In the table, as a comparative example, the result corrected by the method according to Patent Document 2 is also shown.

なお、矯正前のL反り量はいずれも30mmであった。薄肉部板厚基準および平均板厚基準の適正インターメッシュ量で矯正した場合には、L反り量がそれぞれ205mm、90mmと矯正前よりも大きくなったが、本発明法に従って厚肉部板厚基準の適正インターメッシュ量で矯正した場合には、L反り量が5mmと矯正前よりも小さくなり、鋼板全長にわたって均一な矯正効果が得られた。
また、比較例として、特許文献2による方法で矯正した場合には、ローラレベラの入側ロールと出側ロール間の距離400mmに比べてテーパ部の長さが200mmと短く、途中のロールにおいて適正なロール間ギャップが得られないので、L反り量が40mmと矯正前よりも大きくなった。
Note that the L warp amount before correction was 30 mm in all cases. In the case of correction with the appropriate intermesh amount based on the thin wall thickness standard and the average thickness standard, the L warpage amounts were 205 mm and 90 mm, respectively, which were larger than before the correction, but according to the method of the present invention, the thick wall thickness standard When the amount was corrected with the appropriate intermesh amount, the L warpage amount was 5 mm, which was smaller than before correction, and a uniform correction effect was obtained over the entire length of the steel sheet.
In addition, as a comparative example, when corrected by the method according to Patent Document 2, the length of the taper portion is as short as 200 mm compared to the distance 400 mm between the entrance side roll and the exit side roll of the roller leveler, which is appropriate for the intermediate roll. Since the gap between rolls could not be obtained, the L warpage amount was 40 mm, which was larger than before correction.

Figure 2011073007
Figure 2011073007

Claims (2)

ローラレベラを用いて長手方向に板厚が連続的に変化したテーパ鋼板を矯正する際に、最も厚い部分の板厚に対応した適正な入側および出側のロール間ギャップを算出し、入側および出側のロール間ギャップを前記算出値に設定して全長を矯正することを特徴とするテーパ鋼板の矯正方法。   When using a roller leveler to correct a tapered steel sheet with a continuously changing thickness in the longitudinal direction, calculate the appropriate gap between the rolls on the entry and exit sides corresponding to the thickness of the thickest part. A straightening method for a tapered steel sheet, wherein the length between the rolls on the outlet side is set to the calculated value to correct the total length. 出側の上ロール下端を下ロール上端よりも上に配置するとともに、上ロール下端と下ロール上端の上下方向距離を最も厚い部分の板厚に等しくする請求項1に記載のテーパ鋼板の矯正方法。   2. The method for correcting a tapered steel plate according to claim 1, wherein the lower end of the upper roll on the exit side is disposed above the upper end of the lower roll, and the vertical distance between the lower end of the upper roll and the upper end of the lower roll is equal to the thickness of the thickest portion. .
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103433334A (en) * 2013-08-30 2013-12-11 鞍钢股份有限公司 Straightening method preventing steel plates from buckling

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JPS49109256A (en) * 1973-02-21 1974-10-17
JPS61249626A (en) * 1985-04-30 1986-11-06 Mitsubishi Heavy Ind Ltd Gap controlling method among levelling roll
JPH05111716A (en) * 1991-10-21 1993-05-07 Kawasaki Steel Corp Method for operating roller leveler
JPH07178455A (en) * 1993-12-24 1995-07-18 Kawasaki Steel Corp Straightening method of special shape plate and controlling device therefor
JP2005262273A (en) * 2004-03-18 2005-09-29 Jfe Steel Kk Controlled cooling method for differential thickness steel plate

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JPS49109256A (en) * 1973-02-21 1974-10-17
JPS61249626A (en) * 1985-04-30 1986-11-06 Mitsubishi Heavy Ind Ltd Gap controlling method among levelling roll
JPH05111716A (en) * 1991-10-21 1993-05-07 Kawasaki Steel Corp Method for operating roller leveler
JPH07178455A (en) * 1993-12-24 1995-07-18 Kawasaki Steel Corp Straightening method of special shape plate and controlling device therefor
JP2005262273A (en) * 2004-03-18 2005-09-29 Jfe Steel Kk Controlled cooling method for differential thickness steel plate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103433334A (en) * 2013-08-30 2013-12-11 鞍钢股份有限公司 Straightening method preventing steel plates from buckling

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