JP2007007688A - Method for preventing bend of steel tube - Google Patents
Method for preventing bend of steel tube Download PDFInfo
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- JP2007007688A JP2007007688A JP2005191273A JP2005191273A JP2007007688A JP 2007007688 A JP2007007688 A JP 2007007688A JP 2005191273 A JP2005191273 A JP 2005191273A JP 2005191273 A JP2005191273 A JP 2005191273A JP 2007007688 A JP2007007688 A JP 2007007688A
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- steel pipe
- roll
- rolling
- electric resistance
- preventing
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000011324 bead Substances 0.000 claims abstract description 31
- 238000005096 rolling process Methods 0.000 claims abstract description 31
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000005452 bending Methods 0.000 claims description 16
- 239000000498 cooling water Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
Description
本発明は、電縫管製造工程における鋼管の曲がり防止方法に関するものである。 The present invention relates to a method for preventing bending of a steel pipe in an electric resistance welded pipe manufacturing process.
電縫鋼管の製造工程を図６に示す。熱延コイル（６２）は電縫管成形機（６３）で鋼管に成形され、電縫溶接後、切断機（６７）で所定寸法に切断されて、中間テーブル（６９）に払い出される。電縫鋼管（６８）は、中間テーブル（６９）で鋼管内面に残存するビード屑が除去され、高周波加熱装置（７０）で所定温度に加熱されて、複数段からなる縮径圧延機（７１）で縮径圧延が行われる。縮径圧延が終了すると、鋼管の先後端がホットソー（７２）で切断され、冷却床に搬送されて行く。 The manufacturing process of the ERW steel pipe is shown in FIG. The hot-rolled coil (62) is formed into a steel pipe by an electric resistance welder (63), and after electric resistance welding, it is cut into a predetermined dimension by a cutting machine (67) and delivered to an intermediate table (69). The electric resistance welded steel pipe (68) has a bead scrap remaining on the inner surface of the steel pipe removed by the intermediate table (69), and is heated to a predetermined temperature by the high-frequency heating device (70). The diameter reduction rolling is performed at. When the diameter reduction rolling is completed, the front and rear ends of the steel pipe are cut with a hot saw (72) and conveyed to the cooling bed.
ここで、高周波加熱後、縮径圧延が行われた鋼管には、冷却中に曲がりが発生することがあり、その原因がはっきりせず問題であった。 Here, the steel pipe that has been subjected to reduced diameter rolling after high-frequency heating may bend during cooling, and the cause is not clear.
例えば、特許文献１には、クーリングベッド上での鋼管管端部曲がり矯正装置が開示されているが、電縫管製造工程特有の問題点についてはふれていない。
解決しようとする問題点は、縮径圧延完了後の冷却過程で鋼管に曲がりが発生することで、その曲がり防止方法が解決できていない点である。 The problem to be solved is that the bending prevention method cannot be solved because the steel pipe is bent in the cooling process after the diameter reduction rolling is completed.
本発明者らは、上記問題点を鋭意検討して、本発明をなしたものである。
本発明は、その課題を解決するために以下のような構成をとる。
The inventors of the present invention have made the present invention by intensively studying the above problems.
The present invention adopts the following configuration in order to solve the problem.
第一の発明は、高周波加熱後、縮径圧延された電縫鋼管が、冷却工程で曲がるのを防止する電縫鋼管の曲がり防止方法であって、ビード部が縮径圧延機の上ロールの位置となるようにして、圧延することを特徴とする電縫鋼管の曲がり防止方法である。 The first invention is a method for preventing the bending of an ERW steel pipe, which has been reduced in diameter after high-frequency heating, in the cooling process, wherein the bead portion of the upper roll of the reduced diameter rolling mill is prevented. It is a method for preventing the bending of an electric resistance welded steel pipe, which is rolled in a position.
第二の発明は、ビード部の位置が、縮径圧延機の上ロール中心から、左右に４５度の範囲となるようにして、縮径圧延することを特徴とする請求項１記載の電縫鋼管の曲がり防止方法である。 The second aspect of the invention is the electric sewing according to claim 1, wherein the bead portion is subjected to diameter reduction rolling so that the position of the bead portion is in a range of 45 degrees to the left and right from the center of the upper roll of the diameter reduction mill. This is a method for preventing the bending of a steel pipe.
第三の発明は、シーム位置合わせ装置で、ビード部の位置を調整して、縮径圧延することを特徴とする請求項１または請求項２記載の電縫鋼管の曲がり防止方法である。
According to a third aspect of the present invention, there is provided the method for preventing the bending of an electric resistance welded steel pipe according to
第四の発明は、シーム位置合わせ装置がターニングピンチロールとシーム検出器とシーム位置判定演算機とからなることを特徴とする請求項３記載の電縫鋼管の曲がり防止方法である。
According to a fourth aspect of the invention, there is provided the method for preventing the bending of the ERW steel pipe according to claim 3, wherein the seam alignment device comprises a turning pinch roll, a seam detector, and a seam position determination computing unit.
本発明の曲がり防止方法は、多額の設備投資を必要とせずに曲がり防止効果が大きく、曲がり発生による生産停止や、歩留まり低下を防止することが可能となる。 The bend prevention method of the present invention has a large bend prevention effect without requiring a large amount of capital investment, and can prevent production stoppage and yield reduction due to the occurrence of bends.
本発明を実施するための最良の形態を図を参照して説明する。
図４は、高周波加熱後の肉厚２．５ｍｍの電縫鋼管の円周方向温度分布を示した図である。
高周波誘導コイル（３３）で電縫鋼管（３１）を加熱すると、内面ビード（３２）の切削部は周囲の肉厚に比較して薄くなっており、この肉厚が薄い部分に熱が集中し、ビード部が過加熱される。肉厚２．５ｍｍでビード部が周囲より０．２５ｍｍ薄くなっている場合、母材部の温度をT℃とすると、ビード部の温度は、１．１T℃まで加熱され、約１０％の温度差が発生することを知見した。
The best mode for carrying out the present invention will be described with reference to the drawings.
FIG. 4 is a diagram showing a temperature distribution in the circumferential direction of a 2.5 mm-thick ERW steel pipe after high-frequency heating.
When the ERW steel pipe (31) is heated by the high frequency induction coil (33), the cut part of the inner surface bead (32) is thinner than the surrounding wall thickness, and heat concentrates on this thin wall area. The bead portion is overheated. When the wall thickness is 2.5 mm and the bead portion is 0.25 mm thinner than the surroundings, assuming that the temperature of the base material portion is T ° C, the temperature of the bead portion is heated to 1.1 T ° C, and the temperature is about 10%. It was found that a difference occurred.
次に、図３に、縮径圧延前後の温度差の変化を示す。
図中Ａは、電縫鋼管（３１）のビード部（３２）を圧延下ロールに接触するように装入して圧延した場合であり、Ｂは、電縫鋼管（３１）のビード部（３２）を圧延上ロールに接触するように装入して圧延した場合を示している。この場合Ａ，Ｂ共に縮径圧延前はビード部と母材部との温度差は０．１T℃であった（母材部T℃、ビード部１．１T℃）が、縮径圧延後の温度差は、Ａが０．０５T℃、Ｂが０．０１６T℃であり、Ａには曲がりが発生したが、Ｂには曲がりの発生は生じなかったことを知見した。
Next, FIG. 3 shows a change in temperature difference before and after diameter reduction rolling.
In the figure, A is a case where the bead part (32) of the ERW steel pipe (31) is inserted and rolled so as to contact the roll under rolling, and B is a bead part (32 of the ERW steel pipe (31)). ) Is rolled so as to be in contact with the upper roll. In this case, before A and B, the temperature difference between the bead portion and the base material portion was 0.1 T ° C. (base material portion T ° C., bead portion 1.1 T ° C.). As for the temperature difference, A was 0.05 T ° C. and B was 0.016 T ° C., and it was found that bending occurred in A but no bending occurred in B.
更に、図５に、縮径圧延機の上下圧延ロールの冷却状況を示す。
図中、５１は上ロールを、５２は下ロールを、５３はロール冷却水の噴射方向を、５４は、圧延ロールの回転方向を、５５は鋼管の圧延方向を、５６は電縫鋼管をそれぞれ示す。また、ロールに描かれたハッチング部分はロール冷却水がロール表面に広がっている範囲を示したものである。
これによると、上下のロールで冷却水の接触時間が異なること、これにより、上下のロール表面温度に差が発生することがわかった。即ち、上ロール（５１）では冷却水の接触時間が長く、下ロール（５２）では、冷却水の接触時間が短くなっていることを知見した。
Furthermore, the cooling condition of the up-and-down rolling roll of a diameter reducing mill is shown in FIG.
In the figure, 51 is the upper roll, 52 is the lower roll, 53 is the roll cooling water injection direction, 54 is the rolling roll rotation direction, 55 is the rolling direction of the steel pipe, and 56 is the ERW steel pipe. Show. A hatched portion drawn on the roll indicates a range where the roll cooling water spreads on the roll surface.
According to this, it was found that the contact time of the cooling water is different between the upper and lower rolls, which causes a difference in the upper and lower roll surface temperatures. That is, it has been found that the contact time of the cooling water is long in the upper roll (51) and the contact time of the cooling water is short in the lower roll (52).
以上図３、図４、図５を総括すると、電縫鋼管のビード部は、周辺部より高温であること、縮径圧延機の上ロール（５１）は、冷却水の接触時間が長いので、下ロール（５２）に比較してロール表面温度が低いこと、従って、電縫鋼管のビード部が縮径圧延機の上ロール（５１）に接触するようにして圧延すると、圧延後の電縫鋼管の円周方向温度差が小さくなることがわかる。その結果、曲がりも発生しないことを知見した。 3, 4, and 5, the bead portion of the ERW steel pipe is hotter than the peripheral portion, and the upper roll (51) of the diameter reduction rolling mill has a long contact time with the cooling water. When the roll surface temperature is lower than that of the lower roll (52), and the bead portion of the ERW steel pipe is in contact with the upper roll (51) of the reduced diameter rolling mill, the ERW steel pipe after rolling is rolled. It can be seen that the temperature difference in the circumferential direction becomes smaller. As a result, it was found that no bending occurred.
図７によると、Ar3点以上の温度で圧延を終了する電縫鋼管の場合、電縫鋼管の円周方向温度差が大きい（▲：高温部、○：低温部）と冷却中に低温部○が先にＡｒ３変態点を通過して変態膨張し、この膨張差で鋼管が曲がることを知見した。 According to Fig. 7, in the case of ERW steel pipe that finishes rolling at a temperature of 3 or more points of Ar, the circumferential temperature difference of ERW steel pipe is large (▲: high temperature part, ○: low temperature part) and low temperature part during cooling. It has been found that ◯ first passes through the Ar 3 transformation point and undergoes transformation expansion, and the steel pipe bends due to this expansion difference.
本発明は、上記した図３、図４、図５、図７の知見にもとづきなされたもので、
図１は、本発明の電縫鋼管のビード部と縮径圧延機のロールとの位置関係を示す図である。
上述した理由により、電縫鋼管（１１）のビード部（１２）が縮径圧延機（１６）の上ロール（１３）に接触するように圧延するようにしたものである。即ち温度の高いビード部を温度の低い上ロールで圧延するようにしたものである。また、ビード部は縮径圧延機（１６）の上ロール中心から、左右に４５度の範囲にくるように圧延することが望ましい。４５度を超えた部分では、ロール冷却水の冷却効果が小さくなり、円周方向温度差の縮小効果が得られなくなるからである。
The present invention is based on the knowledge of FIG. 3, FIG. 4, FIG. 5, and FIG.
FIG. 1 is a diagram showing a positional relationship between a bead portion of an electric resistance welded steel pipe of the present invention and a roll of a diameter reduction mill.
For the reasons described above, rolling is performed such that the bead portion (12) of the ERW steel pipe (11) is in contact with the upper roll (13) of the reduced diameter rolling mill (16). That is, a bead portion having a high temperature is rolled with an upper roll having a low temperature. Further, it is desirable that the bead portion is rolled so as to be within a range of 45 degrees to the left and right from the center of the upper roll of the reduced diameter rolling mill (16). This is because in the portion exceeding 45 degrees, the cooling effect of the roll cooling water is reduced, and the effect of reducing the circumferential temperature difference cannot be obtained.
図２は、電縫鋼管（２１）のビード部（２２）を縮径圧延機の上ロールの位置にもってくるための、シーム位置合わせ装置を、示すものである。ターニングピンチロール（２３）で電縫鋼管（２３）を回転し、シーム検出器（２４）でシーム位置を検出し、シーム位置判定演算機で、シーム検出位置から上ロール相当位置までの回転角度を演算して、ターニングピンチロール（２３）を回転させてシーム部を天の位置（上ロール相当位置）に移動させるものである。
尚、シーム検出は、鋼管の母材部と電縫部の磁気抵抗変化を継目信号として検出している。
また、シーム位置合わせ装置は、図６の中間テーブル（６６）に設置して、高周波加熱装置（７０）に装入するときに、ビード部が天の位置にくるようにするのが良い。
FIG. 2 shows a seam alignment device for bringing the bead part (22) of the electric resistance welded pipe (21) to the position of the upper roll of the diameter rolling mill. The ERW steel pipe (23) is rotated by the turning pinch roll (23), the seam position is detected by the seam detector (24), and the rotation angle from the seam detection position to the upper roll equivalent position is detected by the seam position determination calculator. By calculating, the turning pinch roll (23) is rotated to move the seam part to the top position (upper roll equivalent position).
In the seam detection, a change in magnetic resistance between the base material portion and the electric seam portion of the steel pipe is detected as a seam signal.
Further, the seam alignment device is preferably installed on the intermediate table (66) of FIG. 6 so that the bead portion is at the top position when being inserted into the high-frequency heating device (70).
本発明は、円周方向に温度差がある電縫鋼管以外の鋼管にも適用できる。 The present invention can also be applied to steel pipes other than ERW steel pipes having a temperature difference in the circumferential direction.
１１ 電縫鋼管
１２ ビード部
１３ 上ロール
１４ 下ロール
１５ サイドロール
１６ 縮径圧延機
２１ 電縫鋼管
２２ ビード部
２３ ターニングピンチロール
２４ シーム検出器
２５ シーム位置合わせ装置
３１ 電縫鋼管
３２ 内面ビードの切削部
３３ 高周波誘導コイル
５１ 上ロール
５２ 下ロール
５３ ロール冷却水の噴射方向
５４ 圧延ロールの回転方法
５５ 圧延方向
５６ 電縫鋼管
６１ アンコイラー
６２ 熱延コイル
６３ 成形ロール
６４ 誘導コイル
６５ スクイズロール
６６ ビード切削バイト
６７ 走間切断機
６８ 電縫鋼管
６９ 中間テーブル
７０ 高周波加熱装置
７１ 縮径圧延機
７２ ホットソー
DESCRIPTION OF SYMBOLS 11 Electric
Claims (4)
4. The method of preventing bending of an electric resistance welded steel pipe according to claim 3, wherein the seam alignment device comprises a turning pinch roll, a seam detector, and a seam position determination calculator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005191273A JP4779465B2 (en) | 2005-06-30 | 2005-06-30 | Prevention of bending of steel pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005191273A JP4779465B2 (en) | 2005-06-30 | 2005-06-30 | Prevention of bending of steel pipe |
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| Publication Number | Publication Date |
|---|---|
| JP2007007688A true JP2007007688A (en) | 2007-01-18 |
| JP4779465B2 JP4779465B2 (en) | 2011-09-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113426843A (en) * | 2021-04-27 | 2021-09-24 | 陈兆启 | Automatic processing system of stainless steel seamless steel pipe |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07303907A (en) * | 1994-05-13 | 1995-11-21 | Nippon Steel Corp | Production of electric resistance welded steel tube excellent in roundness |
| JP2000024714A (en) * | 1998-07-13 | 2000-01-25 | Sumitomo Metal Ind Ltd | Method for controlling seam position of welded tube and device therefor |
-
2005
- 2005-06-30 JP JP2005191273A patent/JP4779465B2/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07303907A (en) * | 1994-05-13 | 1995-11-21 | Nippon Steel Corp | Production of electric resistance welded steel tube excellent in roundness |
| JP2000024714A (en) * | 1998-07-13 | 2000-01-25 | Sumitomo Metal Ind Ltd | Method for controlling seam position of welded tube and device therefor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113426843A (en) * | 2021-04-27 | 2021-09-24 | 陈兆启 | Automatic processing system of stainless steel seamless steel pipe |
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| JP4779465B2 (en) | 2011-09-28 |
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| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |