JP5055938B2 - ERW pipe manufacturing equipment with good weld characteristics - Google Patents

ERW pipe manufacturing equipment with good weld characteristics Download PDF

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JP5055938B2
JP5055938B2 JP2006278602A JP2006278602A JP5055938B2 JP 5055938 B2 JP5055938 B2 JP 5055938B2 JP 2006278602 A JP2006278602 A JP 2006278602A JP 2006278602 A JP2006278602 A JP 2006278602A JP 5055938 B2 JP5055938 B2 JP 5055938B2
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fin
width
strip
shape
tube
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JP2008093703A (en
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一仁 剣持
能知 岡部
泰康 横山
祐二 杉本
智弘 井上
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Jfeスチール株式会社
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本発明は、油井のラインパイプ向けなどの溶接部靭性が要求される管あるいは油井のケーシングパイプなどの溶接部強度が要求される管の製造装置に関わる。   The present invention relates to an apparatus for manufacturing a pipe that requires welded portion toughness such as for oil well line pipes or a pipe that requires welded portion strength such as a casing pipe for oil well.
通常、管は溶接管と継目無管に大別される。溶接管は、電縫鋼管を例とするように、板をロール成形等によって丸めて幅端部を突き合わせて溶接して製造し、継目無管は、材料の塊を高温で穿孔しマンドレルミル等で圧延して製造する。溶接管の場合、一般に溶接部の特性は母材より劣ると言われ、管の適用に当たって、用途ごとに溶接部の靭性や強度の保証が常に議論されて問題となってきた。   Usually, pipes are roughly classified into welded pipes and seamless pipes. Welded pipes are manufactured by rounding plates by roll forming etc. and welding by welding the width ends, as in the case of ERW steel pipes. Seamless pipes are made by drilling a lump of material at a high temperature, etc. Rolled to produce. In the case of a welded pipe, it is generally said that the properties of the welded part are inferior to that of the base metal, and in the application of the pipe, guarantees of toughness and strength of the welded part have always been discussed for each application.
例えば、原油や天然ガスなどを輸送するラインパイプでは、管を寒冷地に敷設されることが多いため低温靭性が重要であり、また、原油採掘の油井では採掘管を保護するためのケーシングパイプが必要とされ、管の強度が重要視される。   For example, in line pipes that transport crude oil, natural gas, etc., low temperature toughness is important because pipes are often laid in cold regions, and casing pipes that protect mining pipes are used in oil wells for crude oil mining. Needed, tube strength is valued.
溶接管の中でも電縫管は、溶接金属を用いずに溶接するため、その製造装置の構成は、少なくとも、帯板を供給する装置、供給された帯板の形状を矯正する装置、矯正された帯板のロール成形を行う装置、ロール成形された帯板幅端部を誘導加熱する装置、誘導加熱された帯板幅端部を圧接する装置からなっている。さらに、溶接された管の溶接部を熱処理する装置、管の外径形状を整える装置を具備する場合が多い。     Among welded pipes, ERW pipes are welded without using weld metal, so the construction of the manufacturing apparatus is at least a device for supplying a strip, a device for correcting the shape of the supplied strip, and a correction. It consists of a device for roll-forming the strip, a device for inductively heating the roll-formed strip width end, and a device for pressure-contacting the induction-heated strip width end. Furthermore, in many cases, a device for heat-treating the welded portion of the welded tube and a device for adjusting the outer diameter shape of the tube are provided.
なお、帯板のロール成形を行う装置は、帯板を弓なりに曲げるブレークダウンロールスタンド、弓なりに曲げられた帯板を管状に丸めるケージロールスタンド、丸められた後の管の形を整えるフィンパス成形スタンドからなっている。   In addition, the device for roll forming of the strip plate is a breakdown roll stand that bends the strip in a bow shape, a cage roll stand that rounds the strip bent in a bow shape into a tubular shape, and a fin pass molding that shapes the tube after being rolled. It consists of a stand.
そのような従来用いられている電縫管の製造装置の一例を図5に示す。帯板20を供給するアンコイラ1と、帯板20を平坦に矯正するレベラー2と、矯正された帯板20を徐々に丸めていくロール成形機4と、丸めた帯板20の左右両幅端部を誘導加熱する誘導加熱装置5と、誘導加熱された帯板幅端部を圧接して管21となすスクイズロール(電縫溶接部)6と、管21の溶接ビード部を切削するビード部切削機7と、切削後の管21の外径を調整するサイザー8と、外径を調整された管21を所定長さに切断する管切断機9とで構成されている。なお、ロール成形機4は最後段に所定台数(ここでは2台)のフィンパス成形スタンド10を備えている。そのフィン形状は1段のテーパ形状からなっている。   An example of such a conventionally used electric sewing tube manufacturing apparatus is shown in FIG. An uncoiler 1 that supplies the strip 20, a leveler 2 that straightens the strip 20, a roll forming machine 4 that gradually rounds the straightened strip 20, and both left and right width ends of the round strip 20 Induction heating device 5 for inductively heating the part, squeeze roll (electro-sealed welded part) 6 that presses the end of the width of the strip that has been induction heated to form pipe 21, and a bead part that cuts the weld bead part of pipe 21 The cutting machine 7, the sizer 8 for adjusting the outer diameter of the pipe 21 after cutting, and the pipe cutting machine 9 for cutting the pipe 21 having the adjusted outer diameter into a predetermined length. The roll forming machine 4 includes a predetermined number (two in this case) of fin pass forming stands 10 at the last stage. The fin shape is a one-step taper shape.
そして、通常、管の母材となる熱延板は、管製造後の母材特性を考慮して成分設計や熱処理等が行われて、母材の靭性や強度等の特性は確保される。   In general, a hot-rolled sheet serving as a base material of a pipe is subjected to component design, heat treatment, and the like in consideration of the base material characteristics after the manufacture of the pipe, and characteristics such as toughness and strength of the base material are ensured.
しかし、溶接部の特性は、母材の成分設計や熱処理等以上に、溶接方法によって大きく左右されるため、特に、電縫溶接の場合は溶接技術の開発が重要であった。   However, since the characteristics of the welded part are greatly influenced by the welding method more than the component design and heat treatment of the base metal, it is particularly important to develop a welding technique in the case of ERW welding.
電縫溶接の不良原因としては、ペネトレータと呼ばれる被溶接帯板の幅端部に生成する酸化物が、電縫溶接時に溶鋼とともに端面から排出されずに残留し、この残留したペネトレータを原因として靭性が低下し強度不足になる例が多かった。   As a cause of poor ERW welding, the oxide generated at the width end of the welded strip called penetrator remains without being discharged from the end surface together with the molten steel during ERW welding, and this toughness is caused by this residual penetrator. There were many cases where the strength decreased and the strength was insufficient.
そこで、従来、ペネトレータを溶接部から除くため、溶接部の被溶接帯板の幅端面から積極的に溶鋼を排出する技術が鋭意検討されてきた。例えば、特許文献1や特許文献2などに、帯板の幅端面の形状について検討した例が記載されている。通常、帯板の幅端面はスリットや端面研削によってほぼ矩形を呈しているが、この幅端面を電縫溶接までに加工して、加工した幅端部形状によって溶接時の溶鋼排出を良好にすることを目的としている。
特開昭57−031485号公報 特開昭63−317212号公報
Therefore, conventionally, in order to remove the penetrator from the welded portion, a technique for actively discharging molten steel from the width end face of the welded strip at the welded portion has been intensively studied. For example, Patent Literature 1 and Patent Literature 2 describe examples in which the shape of the width end face of the strip is studied. Normally, the width end face of the strip is almost rectangular due to slits and end grinding, but this width end face is processed before electro-welding, and the processed wide end shape improves the discharge of molten steel during welding. The purpose is that.
JP-A-57-031485 Japanese Patent Laid-Open No. Sho 63-317212
しかし、本発明者らが特許文献1に記載の方法を検討したところ、フィンパス成形におけるアプセット量を大幅に変更しても、帯板20の幅端部の一部分のみをフィンパス孔型ロールのフィンに接触させることは著しく困難なことが判明した。これは、それまでの成形過程で帯板20の幅端部はわずかしか加工硬化していないために、帯板の幅端部全体がフィンに沿って変形してフィン部に完全充満し易く、帯板の幅端部にフィンの形状が転写されてしまうためである。その結果、電縫溶接直前には帯板20の幅端部が所望の形状になっていない。   However, when the present inventors examined the method described in Patent Document 1, even if the amount of upset in the fin pass molding was significantly changed, only a part of the width end portion of the band plate 20 was used as the fin of the fin pass hole type roll. It turned out to be extremely difficult to contact. This is because the width end portion of the band plate 20 is only slightly hardened in the molding process so far, and the entire width end portion of the band plate is easily deformed along the fins, so that the fin portions are fully filled. This is because the shape of the fin is transferred to the width end of the strip. As a result, the width end portion of the strip 20 is not in a desired shape immediately before the electric resistance welding.
また、本発明者らが特許文献2に記載の方法を検討したところ、ロール成形途中(フィンパス成形スタンドの上流側)でエッジャロール11を用いて帯板20の幅端部全体にテーパ形状を付与するには、この特許文献2に記載されるとおり、管外面側から管内面側にかけて直径が徐々に大きくなるエッジャロールを用いて成形する必要があるため、管内面側となる幅端部がエッジャロールにより削り取られて、「ひげ」と称する余肉材が発生することがあって問題である。さらに、ロール成形される帯板20の横断面方向には管状の帯板20を外側に開く大きな反力が作用するため、エッジャロール11と帯板20の幅端部との圧力は必然的に小さくなる。その結果、前記特許文献1と同様に、エッジャロールでの幅端部の圧下では加工硬化しにくくなり、その後のフィンパス成形でアプセット量を軽減したとしても、帯板がフィン部にほぼ充満して、帯板20の幅端部に特許文献2に記載のような形状を付与することは困難なことが確認された。   Moreover, when the present inventors examined the method of patent document 2, the taper shape is provided to the whole width | variety edge part of the strip 20 using the edger roll 11 in the middle of roll shaping | molding (upstream side of a fin pass shaping | molding stand). Therefore, as described in Patent Document 2, since it is necessary to form using an edger roll whose diameter gradually increases from the pipe outer surface side to the pipe inner surface side, the width end portion on the pipe inner surface side is scraped off by the edger roll. Therefore, there is a problem that an extra material called “beard” is generated. Furthermore, since a large reaction force that opens the tubular band plate 20 to the outside acts in the cross-sectional direction of the band plate 20 to be roll-formed, the pressure between the edger roll 11 and the width end of the band plate 20 is inevitably small. Become. As a result, similarly to the above-mentioned Patent Document 1, it becomes difficult to work harden under the pressure of the width end portion by the edger roll, and even if the amount of upset is reduced by the subsequent fin pass molding, the band plate almost fills the fin portion, It was confirmed that it was difficult to give the shape as described in Patent Document 2 to the width end portion of the band plate 20.
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、電縫溶接直前の幅端部形状を適切な形状とすることができ、それによって、電縫溶接時に十分な溶鋼排出がなされて、ペネトレータが確実に取り除かれ、溶接部特性の良好な電縫管を得ることができる電縫管の製造装置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 can make the shape of the width end portion immediately before ERW welding to be an appropriate shape, thereby sufficiently discharging molten steel during ERW welding. Thus, it is an object of the present invention to provide an electric welded tube manufacturing apparatus in which the penetrator can be reliably removed and an electric welded tube having good welded portion characteristics can be obtained.
前述のように、特許文献1、2に記載の従来技術においては、帯板の幅端面にテーパ形状を付与するために、フィンパス孔型ロールのフィンに帯板の幅端部の一部分を押し当ててテーパ形状を付与するようにしているが、本発明者らの検討によれば、フィンパス孔型ロールに帯板の円周方向全周が充満しなくとも、帯板がフィンパス孔型ロールに装入される際に、幅端部がフィンに強圧されて、幅端部がフィン部に完全充満することを把握した。すなわち、帯板がフィンパス孔型ロールに装入される場合、フィンに接触した帯板の幅端部およびそのほぼ180度反対側に位置する帯板の幅中央部(管状の底の部分)とが梁撓みの状態となって、横断面を円弧形状に曲げようとする帯板の反力が大きく作用して、たとえ帯板がフィンパス孔型ロールに充満しなくとも、帯板の幅端部には円周方向に大きな圧縮力が作用し、その結果、帯板の幅端部はフィンに強圧されてフィンの形状がそのまま帯板の幅端部に転写されることを把握した。 As described above, in the prior art described in Patent Documents 1 and 2, in order to give a taper shape to the width end surface of the band plate, a part of the width end portion of the band plate is pressed against the fin of the fin pass hole roll. However, according to the study by the present inventors, even if the fin pass hole type roll is not filled with the entire circumference of the band plate, the band plate is mounted on the fin pass hole type roll. When entering, it was grasped that the width end portion was strongly pressed by the fin and the width end portion was completely filled in the fin portion. That is, when the strip is inserted into the fin pass hole roll, the width end of the strip in contact with the fin and the width center portion (tubular bottom portion) of the strip located on the opposite side of 180 degrees Is a beam bending state, and the reaction force of the strip plate that tries to bend the cross section into an arc shape acts greatly, even if the strip plate does not fill the fin pass hole roll, the width end of the strip plate A large compressive force acts in the circumferential direction, and as a result, the width end of the strip is strongly pressed by the fin, and the shape of the fin is transferred to the width end of the strip as it is.
そこで、本発明者らは、フィンパス成形において帯板の幅端部がフィンに強圧されることに着目して、この現象を積極的に活用することで、帯板の幅端部に所定のテーパ形状を付与する方法を着想した。すなわち、フィンに2段階以上のテーパを付与しておけば、フィンパス成形でのアプセット量が小さくとも、帯板の幅端部に所望のテーパ形状を付与でき、それによって電縫溶接直前の帯板の幅端部形状を適切なテーパ形状とすることができることを見出した。   Therefore, the present inventors pay attention to the fact that the width end of the band plate is strongly pressed by the fin in the fin pass molding, and by actively utilizing this phenomenon, the taper has a predetermined taper at the width end of the band plate. Inspired by the method of giving shape. In other words, if the taper is provided with two or more stages of taper, the desired taper shape can be given to the width end of the strip even if the amount of upset in the fin pass molding is small. It has been found that the shape of the width end portion can be an appropriate taper shape.
本発明は、上記のような考えに基づいており、以下の特徴を有している。   The present invention is based on the above idea and has the following features.
[1]少なくとも、帯板を供給する装置と、供給された帯板の形状を矯正する装置と、矯正された帯板のロール成形を行う装置と、ロール成形された帯板幅端部を誘導加熱する装置と、誘導加熱された帯板幅端部を圧接する装置とを備えた電縫管の製造装置において、前記ロール成形を行う装置が、2段のテーパ形状を有するフィンを組み込んでなる前段スタンドと2段のテーパ形状を有するフィンを組み込んでなる最終スタンドを備えたフィンパス成形装置を有しているとともに、前記前段スタンドおよび最終スタンドの2段のテーパ形状を有するフィンのそれぞれのテーパがフィンの先端に向かって鉛直方向よりフィンっ中心側に傾いており、該フィンパス成形装置によって、前記フィンパス成形の前段スタンドで、管の内径側となる帯板幅端部にテーパ形状を付与し、前記フィンパス成形の最終スタンドで、管の外径側となる帯板幅端部にテーパ形状を付与するようになっていて、前記テーパ形状は、板厚方向垂直端面からの角度を25°〜50°として、テーパ開始位置から終了位置までの板厚方向の長さを板厚の20%〜40%(ただし、20%は除く)とすることを特徴とする、溶接部肉厚中心位置の−46℃での吸収エネルギーが125J以上、脆性破面率が35%以下である溶接部特性の良好なラインパイプ向けまたはケーシング向け電縫管製造装置。 [1] At least a device for supplying a strip, a device for correcting the shape of the supplied strip, a device for roll-forming the corrected strip, and guiding the roll-formed strip width end An apparatus for manufacturing an electric resistance welded tube comprising an apparatus for heating and an apparatus for press-contacting an induction-heated strip width end, wherein the roll forming apparatus incorporates a fin having a two-stage taper shape. together have a fin pass forming apparatus having a final stand comprising incorporating fins having front stand and two-stage tapered, each tapered fin having a 2-step tapered shape of the front stand and a final stand A band which is inclined toward the center of the fin from the vertical direction toward the tip of the fin , and which is the inner diameter side of the tube at the front stand of the fin path molding by the fin path molding device. A taper shape is imparted to the plate width end portion, and a taper shape is imparted to the strip width end portion on the outer diameter side of the pipe in the final stand of the fin pass molding. The angle from the direction vertical end face is 25 ° to 50 °, and the length in the thickness direction from the taper start position to the end position is 20% to 40% (however, excluding 20%). An apparatus for producing an ERW pipe for a line pipe or a casing having a good welded part characteristic in which the absorbed energy at −46 ° C. at the weld wall thickness center position is 125 J or more and the brittle fracture surface ratio is 35% or less.
本発明においては、著しく良好な靭性および溶接強度を有する電縫管を製造することができる。   In the present invention, an electric resistance welded tube having remarkably good toughness and weld strength can be produced.
本発明の実施形態を以下に述べる。   Embodiments of the present invention are described below.
(第1の実施形態)
本発明の参考とする第1の実施形態に係る電縫管製造装置の基本構成を図1に示す。この電縫管製造装置の基本構成は、帯板20を供給するアンコイラ1と、帯板20を平坦に矯正するレベラー2と、矯正された帯板20を徐々に丸めていくロール成形機4と、丸めた帯板20の左右両幅端部を誘導加熱する誘導加熱装置5と、誘導加熱された帯板幅端部を圧接して管21となすスクイズロール(電縫溶接部)6と、管21の溶接ビード部を切削するビード部切削機7と、切削後の管21の外径を調整するサイザー8と、外径を調整された管21を所定長さに切断する管切断機9とからなっている。なお、ロール成形機4は最後段に所定台数(ここでは2台)のフィンパス成形スタンド4を備えている。
(First embodiment)
FIG. 1 shows a basic configuration of an electric resistance welded tube manufacturing apparatus according to a first embodiment which is a reference of the present invention. The basic configuration of this electric sewing tube manufacturing apparatus includes an uncoiler 1 that supplies a belt plate 20, a leveler 2 that straightens the belt plate 20, and a roll forming machine 4 that gradually rounds the straightened belt plate 20. An induction heating device 5 that induction-heats the left and right width ends of the rolled strip 20, a squeeze roll (electrically welded portion) 6 that presses the induction-heated strip width end to form a pipe 21, and A bead part cutting machine 7 for cutting the weld bead part of the pipe 21, a sizer 8 for adjusting the outer diameter of the pipe 21 after cutting, and a pipe cutting machine 9 for cutting the pipe 21 having the adjusted outer diameter into a predetermined length. It is made up of. The roll forming machine 4 includes a predetermined number (two in this case) of fin pass forming stands 4 at the last stage.
そして、この実施形態に係る電縫管製造装置は、フィンパス成形第1スタンド3aのフィンは通常の1段階のテーパ形状になっているが、図2(a)に横断面図、図2(b)にその部分詳細図を示すように、第2スタンド3bのフィンが2段階のテーパ形状(2段目のテーパ傾斜角度α、2段目の傾斜部垂直長さβ)を備えており、その形状を帯板20の左右両幅端部に転写することによって、図2(c)に示すように、管外面となる側の左右両幅端部に所定のテーパ形状(幅端面から管外面となる表面に向けての傾斜角度α、幅端面における開始位置の管外面となる表面からの板厚方向距離β)を付与するようになっている。   In the ERW pipe manufacturing apparatus according to this embodiment, the fins of the fin path forming first stand 3a have a normal one-step taper shape. FIG. 2 (a) is a cross-sectional view, and FIG. ), The fin of the second stand 3b has a two-step taper shape (second-step taper inclination angle α, second-step inclination portion vertical length β), By transferring the shape to the left and right width end portions of the band plate 20, as shown in FIG. 2 (c), a predetermined taper shape (from the width end surface to the tube outer surface is formed on the left and right width end portions on the side that becomes the tube outer surface. An inclination angle α toward the surface to be formed and a plate thickness direction distance β) from the surface serving as the outer surface of the tube at the start position at the width end surface are provided.
そして、帯板20の左右両幅端部に付与するテーパ形状については、板厚方向垂直端面からの角度(帯板20の幅端面から管外面となる表面に向けての傾斜角度)αが25°〜50°であり、テーパ開始位置から終了位置までの板厚方向の長さ(幅端面におけるテーパ開始位置と管外面となる表面との帯板板厚方向の距離)βが帯板板厚の20%〜40%となるようにしている。   And about the taper shape provided to the right-and-left both width | variety edge part of the strip 20, the angle from the plate | board thickness direction perpendicular | vertical end surface (inclination angle toward the surface used as the pipe outer surface from the width end surface of the strip 20) (alpha) is 25. The length in the plate thickness direction from the taper start position to the end position (the distance in the tape plate thickness direction between the taper start position on the width end face and the surface serving as the tube outer surface) β is the band plate thickness. Of 20% to 40%.
なぜなら、傾斜角度αが25°未満であると、帯板板厚中央部からの溶鋼排出が不十分となってペネトレータが残留して不良となり、電縫溶接後の靭性や強度が低下し、傾斜角度αが50度を超えると、電縫溶接後にもそのテーパ形状が製品の管の疵として残留し問題である。また、テーパ開始距離βが板厚に対して20%未満であると、板厚中央部の溶鋼排出が不十分となってペネトレータが残留しやすくなり、テーパ開始距離βが板厚に対して40%を超えると、電縫溶接後にもそのテーパ形状が製品の管の疵として残留し問題である。   This is because if the inclination angle α is less than 25 °, the molten steel is not sufficiently discharged from the central portion of the strip plate thickness, the penetrator remains and becomes defective, and the toughness and strength after ERW welding are reduced. If the angle α exceeds 50 degrees, the taper shape remains as a wrinkle of the tube of the product even after the electric resistance welding, which is a problem. Further, if the taper start distance β is less than 20% with respect to the plate thickness, the molten steel discharge at the center portion of the plate thickness becomes insufficient and the penetrator tends to remain, and the taper start distance β is 40% of the plate thickness. If it exceeds 50%, the taper shape remains as a flaw of the pipe of the product even after ERW welding, which is a problem.
上記のようにして、この実施形態においては、フィンパス成形最終スタンド3bのフィン形状を2段階の角度を有する形状とし、そのフィン形状を帯板20の左右両幅端部に転写するようにしているので、電縫溶接直前の帯板20の幅端部形状を適切なテーパ形状とすることができる。その結果、電縫溶接時に十分な溶鋼排出がなされて、ペネトレータが確実に取り除かれるので、溶接部特性の良好な電縫管を得ることができる。   As described above, in this embodiment, the fin shape of the fin pass molding final stand 3b has a shape having a two-stage angle, and the fin shape is transferred to the left and right width end portions of the band plate 20. Therefore, the shape of the width end portion of the band plate 20 immediately before the ERW welding can be set to an appropriate tapered shape. As a result, a sufficient amount of molten steel is discharged at the time of electric resistance welding, and the penetrator is surely removed, so that an electric resistance welded tube with good welded portion characteristics can be obtained.
なお、上記において、2段階のテーパ形状を変更することによって、管内面側となる左右両幅端部に所定のテーパ形状を付与することもできる。   In addition, in the above, a predetermined taper shape can also be given to the right-and-left both width | variety edge part used as a pipe inner surface side by changing a taper shape of two steps.
本発明の参考とする第2の実施形態に係る電縫管製造装置の基本構成も、前述の図に示したものである。 The basic configuration of the electric resistance welded tube manufacturing apparatus according to the second embodiment which is a reference of the present invention is also shown in the above-described figure.
そして、この第2の実施形態に係る電縫管製造装置は、フィンパス成形第1スタンド3aのフィンは通常の1段階のテーパ形状になっているが、図3(a)に横断面図、図3(b)にその部分詳細図を示すように、第2スタンド3bのフィンが3段階のテーパ形状(1段目の傾斜部垂直長さδ、2段目のテーパ傾斜角度γ、3段目のテーパ傾斜角度α、3段目の傾斜部垂直長さβ)を備えており、その形状を帯板20の左右両幅端部に転写することによって、図3(c)に示すように、管外面となる側の左右両幅端部に所定のテーパ形状(幅端面から管外面となる表面に向けての傾斜角度α、幅端面における開始位置の管外面となる表面からの板厚方向距離β)を付与するとともに、管内面となる側の左右両幅端部に所定のテーパ形状(幅端面から管内面となる表面に向けての傾斜角度γ、幅端面における開始位置の管内面となる表面からの板厚方向距離ψ)を付与するようになっている。ただし、3段階としたフィンのいずれかの角度がフィンパスロールの垂直方向より大きな角度になると、帯板の幅端部がフィンにより削り取られて、「ひげ」と称する余肉材が発生することがあり、フィンパス成形時に疵を発生させたり、電縫溶接のスパークの原因となったりするので、フィンの角度は垂直方向以下にしておくとよい。   And in the electric resistance welded tube manufacturing apparatus according to the second embodiment, the fins of the fin-pass molding first stand 3a have a normal one-step taper shape. FIG. As shown in FIG. 3 (b), the fins of the second stand 3b have a three-stage taper shape (vertical length δ at the first step, second taper inclination angle γ, third step) 3), and by transferring the shape to the left and right width ends of the band plate 20, as shown in FIG. Predetermined taper shape at both the left and right width ends on the tube outer surface side (inclination angle α from the width end surface to the surface serving as the tube outer surface, distance in the plate thickness direction from the surface serving as the tube outer surface at the starting position at the width end surface β) and a predetermined taper shape (width end face or not) on both the left and right width ends on the tube inner surface side The inclination angle γ towards the surface to be inner surface, so as to impart a thickness direction distance [psi) from the surface of the inner surface of the starting position in the width end face. However, if one of the three fin angles is larger than the vertical direction of the fin pass roll, the width end of the strip is scraped off by the fins, resulting in a surplus material called “beard”. Since fins are formed at the time of forming the fin path and sparks of ERW welding are caused, the angle of the fin is preferably set to be equal to or less than the vertical direction.
そして、帯板20の左右両幅端部に付与するテーパ形状については、帯板20の幅端面から管外面となる表面に向けての傾斜角度αおよび管内面となる表面に向けての傾斜角度γがそれぞれ25°〜50°であり、幅端面におけるテーパ開始位置と管外面となる表面との帯板板厚方向の距離βおよび管内面となる表面との帯板板厚方向の距離ψがそれぞれ帯板板厚の20%〜40%となるようにしている。   And about the taper shape provided to the both right and left width end portions of the band plate 20, the inclination angle α from the width end surface of the band plate 20 toward the surface serving as the tube outer surface and the angle of inclination toward the surface serving as the tube inner surface. γ is 25 ° to 50 °, and the distance β in the strip thickness direction between the taper starting position on the width end face and the surface serving as the pipe outer surface and the distance ψ in the strip thickness direction between the surface serving as the pipe inner surface and Each of them is set to 20% to 40% of the thickness of the strip plate.
なぜなら、傾斜角度α、γが25°未満であると、帯板板厚中央部からの溶鋼排出が不十分となってペネトレータが残留して不良となり、電縫溶接後の靭性や強度が低下し、傾斜角度α、γが50度を超えると、電縫溶接後にもそのテーパ形状が製品の管の疵として残留し問題である。また、テーパ開始距離β、ψが板厚に対して20%未満であると、板厚中央部の溶鋼排出が不十分となってペネトレータが残留しやすくなり、テーパ開始距離β、ψが板厚に対して40%を超えると、電縫溶接後にもそのテーパ形状が製品の管の疵として残留し問題である。   The reason is that if the inclination angles α and γ are less than 25 °, the molten steel discharge from the central portion of the strip plate thickness becomes insufficient, the penetrator remains and becomes defective, and the toughness and strength after ERW welding decrease. If the inclination angles α and γ exceed 50 degrees, the taper shape remains as a wrinkle of the tube of the product even after the electric resistance welding. Further, if the taper starting distances β and ψ are less than 20% of the plate thickness, the molten steel discharge at the central portion of the plate thickness is insufficient and the penetrator tends to remain, and the taper starting distances β and ψ are the plate thickness. On the other hand, if it exceeds 40%, the taper shape remains as a wrinkle of the tube of the product even after the ERW welding, which is a problem.
上記のようにして、この実施形態においては、フィンパス成形最終スタンド3bのフィン形状を3段階の角度を有する形状とし、そのフィン形状を帯板20の左右両幅端部に転写するようにしているので、電縫溶接直前の帯板20の幅端部形状を適切なテーパ形状とすることができる。その結果、電縫溶接時に十分な溶鋼排出がなされて、ペネトレータが確実に取り除かれるので、溶接部特性の良好な電縫管を得ることができる。   As described above, in this embodiment, the fin shape of the fin-pass molding final stand 3b has a shape having three-step angles, and the fin shape is transferred to the left and right width end portions of the band plate 20. Therefore, the shape of the width end portion of the band plate 20 immediately before the ERW welding can be set to an appropriate tapered shape. As a result, a sufficient amount of molten steel is discharged at the time of electric resistance welding, and the penetrator is surely removed, so that an electric resistance welded tube with good welded portion characteristics can be obtained.
(第3の実施形態)
本発明の第3の実施形態に係る電縫管製造装置の基本構成も、前述の図1に示したものである。
(Third embodiment)
The basic structure of the electric resistance welded tube manufacturing apparatus according to the third embodiment of the present invention is also shown in FIG.
そして、この第3の実施形態に係る電縫管製造装置は、図4(a)に横断面図、図4(b)にその部分詳細図を示すように、前段のフィンパス成形第1スタンド3aのフィンが2段階のテーパ形状(1段目の傾斜部垂直長さδ、2段目のテーパ傾斜角度γ)を備えており、その形状を帯板20の左右両幅端部に転写することによって、図4(c)に示すように、管内面となる側の左右両幅端部に所定のテーパ形状(幅端面から管内面となる表面に向けての傾斜角度γ、幅端面における開始位置の管内面となる表面からの板厚方向距離ψ)を付与するとともに、図4(d)に横断面図、図4(e)にその部分詳細図を示すように、後段の第2スタンド3bのフィンが2段階のテーパ形状(2段目のテーパ傾斜角度α、2段目の傾斜部垂直長さβ)を備えており、その形状を帯板20の左右両幅端部に転写することによって、図4(f)に示すように、管外面となる側の左右両幅端部に所定のテーパ形状(幅端面から管外面となる表面に向けての傾斜角度α、幅端面における開始位置の管外面となる表面からの板厚方向距離β)を付与するようになっている。   And the electric resistance welded tube manufacturing apparatus according to the third embodiment is shown in FIG. 4 (a) as a cross-sectional view, and FIG. 4 (b) shows a partial detailed view thereof. The fin has a two-stage taper shape (vertical length δ at the first step, second taper inclination angle γ), and the shape is transferred to the left and right width end portions of the band plate 20. As shown in FIG. 4 (c), the left and right width end portions on the tube inner surface side have predetermined taper shapes (inclination angle γ from the width end surface toward the tube inner surface, the start position on the width end surface The thickness of the second stand 3b in the rear stage is shown in FIG. 4 (d) and a partial detail view thereof in FIG. 4 (e). The fin has a two-step taper shape (taper inclination angle α in the second step, vertical length β in the second step) By transferring the shape to the left and right width end portions of the band plate 20, as shown in FIG. 4 (f), a predetermined taper shape (width end surface) is formed on the left and right width end portions on the tube outer surface side. To the surface which becomes the outer surface of the tube, and the plate thickness direction distance β) from the surface which becomes the outer surface of the tube at the start position at the width end surface.
ちなみに、フィンパス成形第1スタンド3aで管内面となる幅端部にテーパ形状を付与した場合、その部分は強圧によって著しく加工硬化するため、さらにフィンパス成形第2スタンド3bでテーパ形状を付与しても、第1スタンド3aで付与したテーパ形状は比較的潰れにくい。したがって、フィンパス成形終了後の帯板の幅端部には管内面側および管外面側とも所定のテーパ形状が付与できるわけである。   By the way, when the taper shape is given to the width end part which becomes the inner surface of the pipe by the fin pass molding first stand 3a, the portion is remarkably processed and hardened by strong pressure. Therefore, even if the taper shape is given by the fin pass molding second stand 3b, The taper shape provided by the first stand 3a is relatively difficult to collapse. Therefore, a predetermined taper shape can be given to the width end portion of the strip after completion of the fin pass molding on both the tube inner surface side and the tube outer surface side.
そして、帯板20の左右両幅端部に付与するテーパ形状については、帯板20の幅端面から管外面となる表面に向けての傾斜角度αおよび管内面となる表面に向けての傾斜角度γがそれぞれ25°〜50°であり、幅端面におけるテーパ開始位置と管外面となる表面との帯板板厚方向の距離βおよび管内面となる表面との帯板板厚方向の距離ψがそれぞれ帯板板厚の20%〜40%となるようにしている。   And about the taper shape provided to the both right and left width end portions of the band plate 20, the inclination angle α from the width end surface of the band plate 20 toward the surface serving as the tube outer surface and the angle of inclination toward the surface serving as the tube inner surface. γ is 25 ° to 50 °, and the distance β in the strip thickness direction between the taper starting position on the width end face and the surface serving as the pipe outer surface and the distance ψ in the strip thickness direction between the surface serving as the pipe inner surface and Each of them is set to 20% to 40% of the thickness of the strip plate.
なぜなら、傾斜角度α、γが25°未満であると、帯板板厚中央部からの溶鋼排出が不十分となってペネトレータが残留して不良となり、電縫溶接後の靭性や強度が低下し、傾斜角度α、γが50度を超えると、電縫溶接後にもそのテーパ形状が製品の管の疵として残留し問題である。また、テーパ開始距離β、ψが板厚に対して20%未満であると、板厚中央部の溶鋼排出が不十分となってペネトレータが残留しやすくなり、テーパ開始距離β、ψが板厚に対して40%を超えると、電縫溶接後にもそのテーパ形状が製品の管の疵として残留し問題である。   The reason is that if the inclination angles α and γ are less than 25 °, the molten steel discharge from the central portion of the strip plate thickness becomes insufficient, the penetrator remains and becomes defective, and the toughness and strength after ERW welding decrease. If the inclination angles α and γ exceed 50 degrees, the taper shape remains as a wrinkle of the tube of the product even after the electric resistance welding. Further, if the taper starting distances β and ψ are less than 20% of the plate thickness, the molten steel discharge at the central portion of the plate thickness is insufficient and the penetrator tends to remain, and the taper starting distances β and ψ are the plate thickness. On the other hand, if it exceeds 40%, the taper shape remains as a wrinkle of the tube of the product even after the ERW welding, which is a problem.
上記のようにして、この実施形態においては、フィンパス圧において、前段の第1スタンド3aのフィン形状および後段の第2スタンド3bのフィン形状をそれぞれ2段階の角度を有する形状とし、それらのフィン形状を帯板20の左右両幅端部に転写するようにしているので、電縫溶接直前の帯板20の幅端部形状を適切なテーパ形状とすることができる。その結果、電縫溶接時に十分な溶鋼排出がなされて、ペネトレータが確実に取り除かれるので、溶接部特性の良好な電縫管を得ることができる。   As described above, in this embodiment, in the fin pass pressure, the fin shape of the first stand 3a at the front stage and the fin shape of the second stand 3b at the rear stage are each formed into a shape having two-stage angles, and those fin shapes Is transferred to both the left and right width end portions of the band plate 20, the width end portion shape of the band plate 20 immediately before the ERW welding can be made into an appropriate taper shape. As a result, a sufficient amount of molten steel is discharged at the time of electric resistance welding, and the penetrator is surely removed, so that an electric resistance welded tube with good welded portion characteristics can be obtained.
なお、上述の第1〜第3の実施形態においては、フィンパス成形最終スタンド(ここでは、第2スタンド3b)で帯板の管外面側あるいは管外面側の幅端部にテーパ形状を付与するようにしているのは、その直後に電縫溶接が行われるため、良好なテーパ形状を保持したまま電縫溶接が可能であるからである。しかし、フィンパス成形開始スタンドや中間スタンドにおいて帯板の幅端部にテーパ形状を付与し、フィンパス成形最終スタンドではテーパ形状を付与しないようにしてもよい。いったん帯板の幅端部にテーパ形状を付与すれば、その幅端面は強圧によって著しく加工硬化するため、その後にフィンパス成形を行ってもテーパ形状は比較的潰れにくく、フィンパス成形終了後もそのテーパ形状を付与した状態が保持できる。   In the first to third embodiments described above, a tapered shape is applied to the tube outer surface side or the tube outer surface side width end of the band plate in the final fin-pass molding stand (here, the second stand 3b). The reason for this is that since the electric resistance welding is performed immediately after that, it is possible to perform the electric resistance welding while maintaining a good taper shape. However, a taper shape may be imparted to the width end portion of the band plate at the fin-pass molding start stand or the intermediate stand, and the taper shape may not be imparted to the final fin-pass molding stand. Once a taper shape is applied to the width end of the strip, the width end surface is markedly hardened by strong pressure, so the taper shape is relatively difficult to collapse even after fin pass molding. The state to which the shape is imparted can be maintained.
以下、実施例に基づいて説明する。   Hereinafter, a description will be given based on examples.
ここでは、板幅1920mm×19.1tmmの帯板(鋼帯)を用いて、φ600の電縫管を製造した。そして、製造した電縫管の溶接部から試験片を切り出してシャルピー試験を行い、性能を評価した。シャルピー試験片は、管長手方向の相違する10点から1本ずつ、試験片長さ方向を管円周方向に平行にし、ノッチ長さ中心を溶接部肉厚中心位置として採取し、JIS5号の2mmVノッチ衝撃試験片として、−46℃での衝撃試験を行い、吸収エネルギー、脆性破面率を測定した。なお、吸収エネルギーは125J以上、脆性破面率が35%以下を性能許容範囲とした。   Here, an electric resistance welded tube of φ600 was manufactured using a strip (steel strip) having a plate width of 1920 mm × 19.1 tmm. And the test piece was cut out from the weld part of the manufactured ERW pipe, the Charpy test was done, and the performance was evaluated. Each Charpy test piece is taken from 10 points with different pipe longitudinal directions, the specimen length direction is parallel to the pipe circumferential direction, the notch length center is taken as the weld thickness center position, and 2 mmV of JIS5 An impact test at −46 ° C. was performed as a notch impact test piece, and the absorbed energy and the brittle fracture surface ratio were measured. In addition, the absorbed energy was 125 J or more and the brittle fracture surface ratio was 35% or less as the allowable performance range.
参考例参考例として、前述の第2の実施形態に係る電縫管製造装置を用いて上記の電縫管を製造した。なお、管外面となる側の傾斜角度αおよび管内面となる側の傾斜角度γはともに25°とした。 ( Reference Example ) As a reference example , the above-mentioned electric resistance welded tube was manufactured using the electric resistance welded tube manufacturing apparatus according to the second embodiment described above. The inclination angle α on the tube outer surface side and the inclination angle γ on the tube inner surface side were both 25 °.
(従来例) 従来例として、図5に示した従来の電縫管製造装置を用いて上記の電縫管を製造した。   (Conventional example) As a conventional example, the above-mentioned electric resistance welded tube was manufactured using the conventional electric resistance welded tube manufacturing apparatus shown in FIG.
これらにより製造した電縫管の溶接部におけるシャルピー衝撃値と脆性破面率を測定した結果を表1に示す。また。電縫溶接直前の帯板幅端部を切り出して採取し、その幅端部における形状を観察した結果も付記した。   Table 1 shows the results of measuring the Charpy impact value and the brittle fracture surface ratio at the welded portion of the electric resistance welded tube manufactured as described above. Also. The result of observing the shape at the width end portion of the strip end width just before ERW welding was cut out and collected.
表1より、参考例では、溶接部の衝撃強度が高く脆性破面率が小さくて、靭性が良好であって、製品の信頼性が高い。これに比較して、従来例では、溶接部の衝撃強度が低く脆性破面率が大きくて、靭性が低下しており、製品の信頼性に乏しかった。 From Table 1, in the reference example , the impact strength of the welded portion is high, the brittle fracture surface ratio is small, the toughness is good, and the reliability of the product is high. In comparison with this, in the conventional example, the impact strength of the welded portion was low, the brittle fracture surface ratio was large, the toughness was lowered, and the reliability of the product was poor.
本発明に係る電縫管製造装置の基本構成を示す図である。It is a figure which shows the basic composition of the electric sewing tube manufacturing apparatus which concerns on this invention. 本発明の参考とする第1の実施形態に係る電縫管製造装置の説明図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG . 1 is an explanatory view of an electric resistance welded tube manufacturing apparatus according to a first embodiment for reference of the present invention. 本発明の参考とする第2の実施形態に係る電縫管製造装置の説明図である。It is explanatory drawing of the electric sewing tube manufacturing apparatus which concerns on 2nd Embodiment used as a reference of this invention. 本発明の第3の実施形態に係る電縫管製造装置の説明図である。It is explanatory drawing of the electric sewing tube manufacturing apparatus which concerns on the 3rd Embodiment of this invention. 従来の電縫管製造装置を説明するための図である。It is a figure for demonstrating the conventional electric sewing pipe manufacturing apparatus.
符号の説明Explanation of symbols
1 アンコイラ
2 レベラ−
3 フィンパス成形スタンド
3a フィンパス成形第1スタンド
3b フィンパス成形第2スタンド
4 ロール成形機
5 誘導加熱装置
6 スクイズロール(電縫溶接部)
7 ビード切削バイト
8 サイザー
9 管切断機
10 フィンパス成形スタンド
20 帯板
21 管
1 Uncoiler 2 Leveler
3 Fin Pass Forming Stand 3a Fin Pass Forming First Stand 3b Fin Pass Forming Second Stand 4 Roll Forming Machine 5 Induction Heating Device 6 Squeeze Roll (Electro-Seam Welding Section)
7 Bead cutting tool 8 Sizer 9 Pipe cutting machine 10 Fin pass forming stand 20 Strip plate 21 Pipe

Claims (1)

  1. 少なくとも、帯板を供給する装置と、供給された帯板の形状を矯正する装置と、矯正された帯板のロール成形を行う装置と、ロール成形された帯板幅端部を誘導加熱する装置と、誘導加熱された帯板幅端部を圧接する装置とを備えた電縫管の製造装置において、前記ロール成形を行う装置が、2段のテーパ形状を有するフィンを組み込んでなる前段スタンドと2段のテーパ形状を有するフィンを組み込んでなる最終スタンドを備えたフィンパス成形装置を有しているとともに、前記前段スタンドおよび最終スタンドの2段のテーパ形状を有するフィンのそれぞれのテーパがフィンの先端に向かって鉛直方向よりフィン中心側に傾いており、該フィンパス成形装置によって、前記フィンパス成形の前段スタンドで、管の内径側となる帯板幅端部にテーパ形状を付与し、前記フィンパス成形の最終スタンドで、管の外径側となる帯板幅端部にテーパ形状を付与するようになっていて、前記テーパ形状は、板厚方向垂直端面からの角度を25°〜50°として、テーパ開始位置から終了位置までの板厚方向の長さを板厚の20%〜40%(ただし、20%は除く)とすることを特徴とする、溶接部肉厚中心位置の−46℃での吸収エネルギーが125J以上、脆性破面率が35%以下である溶接部特性の良好なラインパイプ向けまたはケーシング向け電縫管製造装置。 At least a device for supplying a strip, a device for correcting the shape of the supplied strip, a device for roll-forming the corrected strip, and a device for induction heating the roll-formed strip width end And a device for press-fitting the induction-heated strip width end, wherein the roll forming device includes a front stand incorporating fins having a two-step tapered shape; A fin path forming apparatus having a final stand incorporating a fin having a two-step taper shape, and each taper of the fin having the two-step taper shape of the front stand and the final stand is a tip of the fin Is inclined toward the fin center side from the vertical direction toward the center , and the fin-pass forming device uses the fin- stand forming front stand to form the end of the strip that becomes the inner diameter side of the tube. In the final stand of the fin pass molding, a taper shape is given to the end portion of the width of the strip on the outer diameter side of the tube, and the taper shape is from the vertical end surface in the plate thickness direction. Characterized in that the angle in the plate thickness direction is 25 ° to 50 °, and the length in the plate thickness direction from the taper start position to the end position is 20% to 40% (excluding 20%) of the plate thickness. An electro-resistance tube manufacturing apparatus for line pipes or casings with good welded properties, wherein the absorbed energy at -46 ° C at the center of the wall thickness is 125 J or more and the brittle fracture surface ratio is 35% or less.
JP2006278602A 2006-10-12 2006-10-12 ERW pipe manufacturing equipment with good weld characteristics Active JP5055938B2 (en)

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JP2006278602A JP5055938B2 (en) 2006-10-12 2006-10-12 ERW pipe manufacturing equipment with good weld characteristics
KR1020087010574A KR101246935B1 (en) 2006-10-12 2006-11-09 Apparatus for manufacturing seam-welded pipe excelling in welded portion characteristic
US11/992,896 US8296932B2 (en) 2006-10-12 2006-11-09 Manufacturing equipment for electric resistance welding pipes having excellent characterization for welded seam
EP06823443.4A EP2039441B1 (en) 2006-10-12 2006-11-09 Apparatus for manufacturing seam-welded pipe excelling in welded portion characteristic
PCT/JP2006/322795 WO2008044323A1 (en) 2006-10-12 2006-11-09 Apparatus for manufacturing seam-welded pipe excelling in welded portion characteristic
CN2006800407454A CN101300090B (en) 2006-10-12 2006-11-09 Apparatus for manufacturing seam-welded pipe excelling in welded portion characteristic
RU2008118217/02A RU2411095C2 (en) 2006-10-12 2006-11-09 Equipment for producing tubes by contact welding with high-quality welded seam
AU2006349207A AU2006349207B8 (en) 2006-10-12 2006-11-09 Manufacturing equipment of electric resistance welding pipes having excellent characterization of welded seam
TW095141642A TWI308089B (en) 2006-10-12 2006-11-10

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US8365621B2 (en) 2009-02-27 2013-02-05 Honda Motor Co., Ltd. Arrangement structure of shifting actuator of internal combustion engine mounted on motorcycle
CN102240898A (en) * 2010-05-12 2011-11-16 杨铁君 Preparation method for heat exchange tube used for extracting temperature of sewage
CN102672569A (en) * 2011-03-07 2012-09-19 吴江市中信科技有限公司 Polishing machine
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JPH0368740A (en) * 1989-08-03 1991-03-25 Kobe Steel Ltd Thick and small-diameter electric welded steel tube having uniform width of white layer and production thereof
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