JP5510138B2 - Cold-rolled steel plate welding method - Google Patents
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Description
本発明は、冷延鋼板処理ラインにおいて、冷延鋼板を溶接する方法に関するものである。 The present invention relates to a method for welding cold-rolled steel sheets in a cold-rolled steel sheet processing line.
冷延鋼板処理ラインにおいては、冷延鋼板を連続して処理するために、先行の冷延鋼板（先行板）と後行の冷延鋼板（後行板）を溶接接続して連続化している。そして、それに用いる溶接装置として、例えば、マッシュシーム溶接装置が知られている（例えば、特許文献１参照）。 In the cold-rolled steel sheet processing line, in order to continuously process the cold-rolled steel sheet, the preceding cold-rolled steel sheet (preceding board) and the subsequent cold-rolled steel sheet (following board) are connected by welding. . For example, a mash seam welding apparatus is known as a welding apparatus used therefor (see, for example, Patent Document 1).
マッシュシーム溶接装置は、その一例を図１に示すように、先行板１ａの後端部と後行板１ｂの先端部を重ね合わせて溶接する装置であり、キャリッジ１０に回転式電極２とプラニッシュロール３が搭載されていて、キャリッジ１０を鋼板幅方向（矢印５の方向）に移動させながら、先行板１ａと後行板１ｂの重ね合わせ部を回転式電極２によって溶接し、さらに、その重ね合わせて溶接した溶接部（重ね溶接継手部）をプラニッシュロール３によって圧下してその肉厚を薄くする溶接装置である。なお、図１中の４はプラニッシュロール３の圧下シリンダーである。また、プラニッシュロール３は駆動モータ（図示せず）によって駆動回転するようになっており、これによって、圧下による摩擦抵抗に抗して回転できるようになっている。
As shown in FIG. 1, the mash seam welding apparatus is an apparatus that welds the rear end portion of the leading plate 1 a and the leading end portion of the
冷延鋼板処理ラインに設置された溶接装置（マッシュシーム溶接装置）では、板厚が薄い冷延鋼板（薄物材）を溶接する場合、プラニッシュロールの圧下力が大きいと、プラニッシュロールの回転速度とキャリッジの走行速度が等しくない時に、溶接部を引きちぎり、その結果、再溶接が必要となり、ライン稼働率が低下するという問題がある。 In the welding equipment (mash seam welding equipment) installed in the cold-rolled steel sheet processing line, when welding a cold-rolled steel sheet (thin material) with a thin plate thickness, if the pressing force of the finish roll is large, the finish roll rotates. When the speed and the traveling speed of the carriage are not equal, the welded part is torn off, and as a result, re-welding is required, resulting in a problem that the line operation rate decreases.
本発明は、上記のような事情に鑑みてなされたものであり、冷延鋼板処理ラインに設置された溶接装置（マッシュシーム溶接装置）において、溶接部の引きちぎり等による溶接不良の発生を的確に防止することができる冷延鋼板の溶接方法を提供することを目的とするものである。 The present invention has been made in view of the above circumstances, and in a welding apparatus (mash seam welding apparatus) installed in a cold-rolled steel sheet processing line, it is possible to accurately detect the occurrence of welding failure due to tearing of a welded portion. It is an object of the present invention to provide a method for welding a cold-rolled steel sheet that can be prevented.
本発明者らは、上記課題を解決するために鋭意検討を行った結果、以下のような考えに至った。 As a result of intensive studies to solve the above problems, the present inventors have reached the following idea.
すなわち、従来は、プラニッシュロールの圧下力の設定値は常に同じであるため、プラニッシュロールの回転速度がキャリッジ走行速度より遅くなる場合等によって、プラニッシュロールの回転速度のばらつきが発生すると、板厚が薄い冷延鋼板同士の溶接では、溶接部の引きちぎり等の溶接不良が発生する。そこで、溶接する冷延鋼板の板厚に応じてプラニッシュロールの圧下力を適切に変更することにより、プラニッシュロールの回転速度がキャリッジの走行速度と等しくなくとも、溶接部の引きちぎり等の溶接不良を防止することができる。 That is, conventionally, since the setting value of the rolling force of the finish roll is always the same, when the rotation speed of the finish roll becomes slower than the carriage traveling speed, etc. In the welding of cold-rolled steel plates having a thin plate thickness, poor welding such as tearing of the welded portion occurs. Therefore, by appropriately changing the reduction force of the finish roll according to the thickness of the cold-rolled steel sheet to be welded, even if the rotation speed of the finish roll is not equal to the traveling speed of the carriage, Welding defects can be prevented.
上記のような考え方に基づいて、本発明は以下のような特徴を有している。 Based on the above concept, the present invention has the following features.
［１］冷延鋼板処理ラインに設置されて、先行の冷延鋼板の後端部と後行の冷延鋼板の先端部を重ね合わせて溶接するための溶接装置として、キャリッジに回転式電極と駆動回転式プラニッシュロールが搭載されていて、前記キャリッジを冷延鋼板の幅方向に移動させながら、先行の冷延鋼板と後行の冷延鋼板の重ね合わせ部を回転式電極によって溶接し、さらに、その重ね合わせて溶接した溶接部を前記駆動回転式プラニッシュロールによって圧下してその肉厚を薄くする溶接装置において、
先行の冷延鋼板の板厚と後行の冷延鋼板の板厚との合計値に基づいて駆動回転式プラニッシュロールの圧下力を調整することを特徴とする冷延鋼板の溶接方法。
[1] As a welding apparatus that is installed in a cold-rolled steel sheet processing line and welds a rear end portion of a preceding cold-rolled steel plate and a front end portion of a subsequent cold-rolled steel plate, A driving rotary finish roll is mounted, and while the carriage is moved in the width direction of the cold-rolled steel sheet, the overlapping portion of the preceding cold-rolled steel sheet and the subsequent cold-rolled steel sheet is welded by the rotary electrode, Furthermore, in the welding apparatus that reduces the thickness by reducing the thickness of the welded portion, which is overlapped and welded, by the drive rotary finish roll,
A method of welding a cold-rolled steel sheet, comprising adjusting a rolling force of a driving rotary finish roll based on a total value of a thickness of a preceding cold-rolled steel sheet and a thickness of a subsequent cold-rolled steel sheet.
［２］先行の冷延鋼板の板厚ｔ１と後行材の板厚ｔ２の合計値Ｔに基づいて、プラニッシュロールの圧下力Ｐを以下の値に設定することを特徴とする前記［１］に記載の冷延鋼板の溶接方法。
Ｔ＜０．４ｍｍの場合、Ｐ＝Ａ（ｋＮ）
０．４ｍｍ≦Ｔ＜０．６ｍｍの場合、Ｐ＝２×Ａ（ｋＮ）
０．６ｍｍ≦Ｔ の場合、Ｐ＝３×Ａ（ｋＮ）
ここで、Ａは、先行と後行の冷延鋼板の板厚合計値Ｔが０．４ｍｍ未満の場合のプラニッシュロールの設定圧下力である。
[2] Based on the total value T of the thickness t1 of the preceding cold-rolled steel plate and the thickness t2 of the following material, the rolling force P of the finish roll is set to the following value: [1 ] The welding method of the cold-rolled steel plate of description.
When T <0.4 mm, P = A (kN)
In the case of 0.4 mm ≦ T <0.6 mm, P = 2 × A (kN)
In the case of 0.6 mm ≦ T, P = 3 × A (kN)
Here, A is a set rolling force of the finish roll when the total thickness value T of the preceding and subsequent cold-rolled steel sheets is less than 0.4 mm.
本発明により、冷延鋼板処理ラインに設置された溶接装置（マッシュシーム溶接装置）において、溶接部の引きちぎり等による溶接不良の発生を的確に防止することができる。その結果、再溶接が不要となり、冷延鋼板処理ラインの稼働率を向上させることができる。 According to the present invention, in a welding apparatus (mash seam welding apparatus) installed in a cold-rolled steel sheet processing line, it is possible to accurately prevent the occurrence of poor welding due to tearing of a welded portion or the like. As a result, re-welding becomes unnecessary, and the operating rate of the cold-rolled steel sheet processing line can be improved.
本発明の一実施形態を述べる。 One embodiment of the present invention will be described.
本発明の一実施形態における溶接装置は、図１に示したマッシュシーム溶接装置である。ここで、図１は鋼板通過方向から板幅を見た図である。 The welding apparatus in one embodiment of the present invention is the mash seam welding apparatus shown in FIG. Here, FIG. 1 is the figure which looked at the plate | board width from the steel plate passage direction.
図１に示したように、このマッシュシーム溶接装置は、冷延鋼板処理ラインに設置されて、先行の冷延鋼板（先行板）１ａの後端部と後行の冷延鋼板（後行板）１ｂの先端部を重ね合わせて溶接する装置であり、キャリッジ１０に回転式電極２と駆動回転式プラニッシュロール３が搭載されていて、キャリッジ１０を鋼板幅方向（矢印５の方向）に移動させながら、先行板１ａと後行板１ｂの重ね合わせ部を回転式電極２によって溶接し、さらに、その重ね合わせて溶接した溶接部（重ね溶接継手部）を駆動回転式プラニッシュロール３（圧下シリンダー４）によって圧下してその肉厚を薄くする溶接装置である。
As shown in FIG. 1, this mash seam welding apparatus is installed in a cold-rolled steel sheet processing line, and includes a rear end portion of a preceding cold-rolled steel sheet (leading board) 1a and a succeeding cold-rolled steel sheet (following board). ) This is a device that welds the tip end portion of 1b by superimposing, and the
そして、この実施形態においては、先行板１ａの板厚ｔ１と後行材１ｂの板厚ｔ２の合計値Ｔ（＝ｔ１＋ｔ２）を溶接装置の制御装置（図示せず）に伝送し、制御装置はその合計値Ｔに基づいて、プラニッシュロール３（圧下シリンダー４）の圧下力Ｐを以下の値に設定して、溶接を行うようにしている。
In this embodiment, the total value T (= t1 + t2) of the plate thickness t1 of the preceding plate 1a and the plate thickness t2 of the following
Ｔ＜０．４ｍｍの場合、Ｐ＝Ａ（ｋＮ）
０．４ｍｍ≦Ｔ＜０．６ｍｍの場合、Ｐ＝２×Ａ（ｋＮ）
０．６ｍｍ≦Ｔ の場合、Ｐ＝３×Ａ（ｋＮ）
ここで、Ａは、先行と後行の冷延鋼板の板厚合計値Ｔが０．４ｍｍ未満の場合のプラニッシュロールの設定圧下力である。
When T <0.4 mm, P = A (kN)
In the case of 0.4 mm ≦ T <0.6 mm, P = 2 × A (kN)
In the case of 0.6 mm ≦ T, P = 3 × A (kN)
Here, A is a set rolling force of the finish roll when the total thickness value T of the preceding and subsequent cold-rolled steel sheets is less than 0.4 mm.
これによって、この実施形態では、溶接部の引きちぎりが発生し易い薄物材の溶接においても、プラニッシュロール３の圧下力を適切に設定することにより、プラニッシュロール３の回転速度がキャリッジ１０の走行速度と等しくない時でも、溶接部の引きちぎりを防止することができる。その結果、冷延鋼板処理ラインの稼働率を向上させることができる。
Thereby, in this embodiment, even in the welding of a thin material in which tearing of the welded portion is likely to occur, the rotational speed of the
本発明の実施例１を述べる。 A first embodiment of the present invention will be described.
この実施例１では、冷延鋼板処理ラインにおいて、図１に示した溶接装置（マッシュシーム溶接装置）を用いて、先行板１ａと後行板１ｂの溶接を行った。
In Example 1, the preceding plate 1a and the succeeding
その際に、ライン速度は最大８００ｍｐｍ、キャリッジの走行速度は１５ｍｐｍ、先行板の板厚ｔ１および後行材１ｂの板厚ｔ２は同一でそれぞれ０．１〜０．５ｍｍであった。また、先行板１ａの後端部と後行板１ｂの先端部の重ね合わせ長さは１ｍｍとした。
At that time, the maximum line speed was 800 mpm, the carriage traveling speed was 15 mpm, the plate thickness t1 of the preceding plate and the plate thickness t2 of the following
本発明例として、上記の本発明の一実施形態に基づいて、先行板１ａの後端部と後行板１ｂの先端部との溶接を行った。
As an example of the present invention, welding was performed on the rear end portion of the preceding plate 1a and the front end portion of the succeeding
すなわち、先行板１ａの板厚ｔ１と後行材１ｂの板厚ｔ２の合計値Ｔ（＝ｔ１＋ｔ２）に基づいて、プラニッシュロール３（圧下シリンダー４）の圧下力Ｐを以下の値にして溶接を行った。
That is, based on the total value T (= t1 + t2) of the plate thickness t1 of the preceding plate 1a and the plate thickness t2 of the following
Ｔ＜０．４ｍｍの場合、Ｐ＝５（ｋＮ）
０．４ｍｍ≦Ｔ＜０．６ｍｍの場合、Ｐ＝１０（ｋＮ）
０．６ｍｍ≦Ｔ の場合、Ｐ＝１５（ｋＮ）
When T <0.4mm, P = 5 (kN)
In the case of 0.4 mm ≦ T <0.6 mm, P = 10 (kN)
In the case of 0.6 mm ≦ T, P = 15 (kN)
なお、比較のために、従来例として、プラニッシュロール３（圧下シリンダー４）の圧下力Ｐを一定値（１５ｋＮ）として溶接を行った。 For comparison, as a conventional example, welding was performed with the rolling force P of the planar roll 3 (the rolling cylinder 4) set to a constant value (15 kN).
図２に、本発明例と従来例の溶接不良発生率の比較結果を示す。従来例では溶接不良発生が２〜４％あったものが、本発明例では０％に低下し、大きな効果が得られている。 FIG. 2 shows a comparison result of the occurrence rate of poor welding between the inventive example and the conventional example. In the conventional example, the occurrence of poor welding was 2 to 4%, but in the present invention example, it was reduced to 0%, and a great effect was obtained.
１ａ 先行の冷延鋼板（先行板）
１ｂ 後行の冷延鋼板（後行板）
２ 回転式電極
３ 駆動回転式プラニッシュロール
４ 圧下シリンダー
５ キャリッジの移動方向
１０ キャリッジ
1a Leading cold-rolled steel sheet (leading board)
1b Subsequent cold-rolled steel sheet (subsequent plate)
2 Rotating
Claims (2)
先行の冷延鋼板の板厚と後行の冷延鋼板の板厚との合計値に基づいて駆動回転式プラニッシュロールの圧下力を調整することを特徴とする冷延鋼板の溶接方法。 Installed in the cold-rolled steel sheet processing line, as a welding device for welding by overlapping the rear end of the preceding cold-rolled steel sheet and the front-end of the subsequent cold-rolled steel sheet, the rotary electrode and drive rotary type on the carriage A planar roll is mounted, and while the carriage is moved in the width direction of the cold-rolled steel sheet, the overlap portion of the preceding cold-rolled steel sheet and the subsequent cold-rolled steel sheet is welded by a rotary electrode, In the welding apparatus for reducing the thickness by reducing the thickness of the welded portion that has been overlapped and welded by the driven rotary polish roll,
A method of welding a cold-rolled steel sheet, comprising adjusting a rolling force of a driving rotary finish roll based on a total value of a thickness of a preceding cold-rolled steel sheet and a thickness of a subsequent cold-rolled steel sheet.
Ｔ＜０．４ｍｍの場合、Ｐ＝Ａ（ｋＮ）
０．４ｍｍ≦Ｔ＜０．６ｍｍの場合、Ｐ＝２×Ａ（ｋＮ）
０．６ｍｍ≦Ｔ の場合、Ｐ＝３×Ａ（ｋＮ）
ここで、Ａは、先行と後行の冷延鋼板の板厚合計値Ｔが０．４ｍｍ未満の場合のプラニッシュロールの設定圧下力である。 The rolling force P of the finish roll is set to the following value based on the total value T of the thickness t1 of the preceding cold-rolled steel plate and the thickness t2 of the succeeding material. A method for welding cold-rolled steel sheets.
When T <0.4 mm, P = A (kN)
In the case of 0.4 mm ≦ T <0.6 mm, P = 2 × A (kN)
In the case of 0.6 mm ≦ T, P = 3 × A (kN)
Here, A is a set rolling force of the finish roll when the total thickness value T of the preceding and subsequent cold-rolled steel sheets is less than 0.4 mm.
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |