JP4314972B2 - Method for constant diameter rolling of metal tubes - Google Patents
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- JP4314972B2 JP4314972B2 JP2003377115A JP2003377115A JP4314972B2 JP 4314972 B2 JP4314972 B2 JP 4314972B2 JP 2003377115 A JP2003377115 A JP 2003377115A JP 2003377115 A JP2003377115 A JP 2003377115A JP 4314972 B2 JP4314972 B2 JP 4314972B2
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- 238000005096 rolling process Methods 0.000 title claims description 63
- 238000000034 method Methods 0.000 title claims description 29
- 239000002184 metal Substances 0.000 title claims description 8
- 238000012545 processing Methods 0.000 claims description 9
- 238000005452 bending Methods 0.000 description 42
- 230000037303 wrinkles Effects 0.000 description 19
- 239000000463 material Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000037330 wrinkle prevention Effects 0.000 description 1
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Description
本発明は、サイザやストレッチレデユーサ等の定径圧延機による金属管の定径圧延方法に関し、定径圧延機に供給される仕上げ用素管が、そのセンター（重心位置）が定径圧延機の第１スタンドの孔型センターからずれた状態で挿入されても、定径圧延後の管に大きな先端曲がりや深いエッジ疵が発生しない定径圧延方法に関する。 TECHNICAL FIELD The present invention relates to a method for constant diameter rolling of a metal tube by a constant diameter rolling mill such as a sizer or a stretch reducer, and the finishing blank supplied to the constant diameter rolling mill has a center (center of gravity position) at a constant diameter rolling mill. The present invention relates to a constant diameter rolling method in which a large tip bend and deep edge wrinkles do not occur in a tube after constant diameter rolling even if it is inserted in a state shifted from the perforated center of the first stand.
中実角ビレットを素材とするプレスピアシングミルや中実丸ビレットを素材とするマンネスマンピアサに代表される傾斜ロール式の穿孔圧延機により中空素管を得る熱間圧延法によるＦｅ基合金やＮｉ基合金等の継目無金属管の製造方法では、得られた中空素管に延伸圧延と定径圧延を施して所定の製品寸法に仕上げる。 Fe-based alloy or Ni by hot rolling method that obtains hollow shell by tilting roll type piercing and rolling mill represented by press piercing mill made of solid square billet and Mannesmann Piercer made of solid round billet In a method for producing a seamless metal pipe such as a base alloy, the obtained hollow shell is subjected to stretching rolling and constant diameter rolling to finish a predetermined product size.
延伸圧延にはプラグミルやマンドレルミル等の延伸圧延機が使用され、定径圧延にはザイザやストレッチレデユーサ等の定径圧延機が使用される。 A stretching mill such as a plug mill or a mandrel mill is used for the stretching rolling, and a constant rolling mill such as a sizer or a stretch reducer is used for the constant diameter rolling.
プラグミルは２個一対の圧延用孔型ロールおよびリターンロールが組み込まれた１スタンドと内面規制工具のプラグとを具備する圧延機であり、マンドレルミルは１スタンド内に複数個（一般的には２個または３個で、ときに４個の場合もある）の孔型ロールが垂直面内に配置された複数スタンドと内面規制工具のマンドレルバーとを具備する圧延機である。また、サイザおよびストレッチレデユーサは、内面規制工具のマンドレルバーを具備しない点を除いて前記のマンドレルミルと同様の構成の複数スタンドからなる圧延機で、通常、１スタンド内には２個または３個の孔型ロールが組み込まれている。 The plug mill is a rolling mill having one stand incorporating a pair of rolling hole rolls and return rolls and a plug for an inner surface regulating tool, and a plurality of mandrel mills (generally 2 in a stand). A rolling mill comprising a plurality of stands each having three or three, sometimes four) roll rolls arranged in a vertical plane, and a mandrel bar for an inner surface regulating tool. The sizer and the stretch reducer are rolling mills having a plurality of stands having the same configuration as the mandrel mill except that the mandrel bar as an inner surface regulating tool is not provided. A single perforated roll is incorporated.
これらの定径圧延機では、圧延後の管に曲がりが発生することがある。即ち、内面規制工具を具備しない定径圧延機では曲がりが発生しやすく、特に、管の最初に圧延された端部（圧延先端部）が曲がる、いわゆる「先端曲がり」が発生しやすい。この先端曲がりが発生した管製品は寸法精度が劣る。また、先端曲がりが発生すると孔型ロールのフランジ部分への材料噛み出しが著しくなり、孔型ロールのカリバ側フランジの端部で焼き付きが生じて管外面に深いエッジ疵が多発するようになり、不良品や格下げ品が多くなって歩留まりも低下する。 In these constant diameter rolling mills, bending may occur in the tube after rolling. That is, in a constant diameter rolling mill that does not have an inner surface regulating tool, bending is likely to occur, and in particular, a so-called “tip bending” in which an end portion (rolling tip portion) rolled at the beginning of the tube is bent is likely to occur. The pipe product in which the tip bending occurs has poor dimensional accuracy. In addition, when the tip bend occurs, material biting into the flange part of the hole roll becomes remarkable, and seizure occurs at the end of the caliber side flange of the hole roll, resulting in frequent occurrence of deep edge wrinkles on the outer surface of the pipe. The number of defective and downgraded products increases and the yield also decreases.
このため、従来、種々の曲がり防止方法やエッジ疵防止方法が提案されている。その代表的なものを挙げると以下のとおりである。 For this reason, conventionally, various bending prevention methods and edge wrinkle prevention methods have been proposed. Typical examples are as follows.
(a) 管先端通過時には孔型ロール間隔を設定値よりも大きくしておき、管先端の孔型ロール軸心位置通過直後に孔型ロール間隔を設定値にもどす方法（特許文献１）。 (a) A method in which the hole roll interval is made larger than a set value when passing through the tube tip, and the hole roll interval is returned to the set value immediately after passing through the hole roll axial center position at the tube tip (Patent Document 1).
(b) 穿孔圧延された中空素管の圧延先端部を強制冷却してからマンドレルミルで圧延する方法（特許文献２）。 (b) A method of forcibly cooling the rolling tip of a hollow core tube that has been pierced and rolled, followed by rolling with a mandrel mill (Patent Document 2).
(c) ２ロール式サイザの上側ロール周速度を下側ロール周速度よりも大きくするか、または上側ロールの胴径を下側ロールの胴径よりも大きくする方法（特許文献３）。 (c) A method in which the upper roll peripheral speed of the two-roll type sizer is made larger than the lower roll peripheral speed, or the upper roll body diameter is made larger than the lower roll body diameter (Patent Document 3).
(d) レデユーサミルの各スタンドの３個の孔型ロールをそれぞれ独立で位置調整可能にする一方、最終仕上げスタンド出側で測定される管の曲がり量と曲がり方向に応じて最終仕上げスタンドの直前２スタンドの孔型ロール位置を個別に変位させてミルのパスラインを調整する方法（特許文献４）。
(d) The three perforated rolls of each stand of the Redeusa mill can be independently adjusted, while the position just before the
(e) レデユーサミルの入側の第１、２および出側の２〜４スタンドを除いた残りのスタンドを前段スタンド群と後段スタンド群とに分け、各スタンド群内での楕円率の偏差を±１％以内、各スタンド群内の楕円率平均値の群間差を１．５％以上、各スタンドの縮径率を３％以上に設定して圧延する方法（特許文献５）。 (e) The remaining stands excluding the first and second stands on the entrance side and the 2-4 stands on the exit side of the redeusa mill are divided into a front stand group and a rear stand group, and the deviation in ellipticity within each stand group is ± A method of rolling within 1%, setting the difference between the average ellipticity values in each stand group to 1.5% or more and the diameter reduction rate of each stand to 3% or more (Patent Document 5).
(f) レデユーサミルの入側の第１、２スタンドの孔型ロールのカリバ形状を、上工程のマンドレルミルの最終スタンドの孔型ロールのカリバのフランジ側径と関連付けた形状にして圧延する方法（特許文献６）。 (f) A rolling method in which the caliber shape of the first and second stand hole rolls on the entry side of the redeusa mill is related to the flange side diameter of the caliber flange of the final roll of the upper mandrel mill in the upper process ( Patent Document 6).
しかし、上記の各方法には、それぞれ下記(A)〜(F)の欠点があるだけでなく、定径圧延機に供給される仕上げ用素管が、そのセンター（重心位置）が定径圧延機の第１スタンドの孔型センターからずれた状態で挿入された場合には、先端曲がりが改善されないだけでなく、深いエッジ疵の発生も解消されないという問題があった。なお、圧延先端部の先端曲がりが延伸圧延機による圧延直後の仕上げ用素管にない場合でも、その搬送中に先端曲がりが発生することがある。 However, each of the above methods has not only the following disadvantages (A) to (F), but also the finishing pipe supplied to the constant diameter rolling mill has its center (center of gravity position) constant diameter rolling. When inserted in a state shifted from the hole-type center of the first stand of the machine, there is a problem that not only the bending of the tip is not improved but also the occurrence of deep edge wrinkles is not eliminated. Even when the leading end bending of the rolling tip is not present in the finishing blank immediately after rolling by the drawing mill, the leading end bending may occur during the conveyance.
(A) 特許文献１の方法では、パスラインが基準点からずれることによる曲がりまでは改善されない。 (A) The method of Patent Document 1 does not improve the bending due to the pass line deviating from the reference point.
(B) 特許文献２の方法では、円周方向に均一に冷却するためには管をその軸心廻りに回転させる必要があるので、ターニングローラを具備する冷却装置が必要で、設備費が高くなる。また、冷却によって管先端部が硬くなるために噛み込み時に焼き付きが生じて孔型ロール表面を損傷させるおそれがある。さらに、冷却された管端部は、径が他の部分よりも小さくなるために切り捨てる必要があり、歩留まりも悪い。
(B) In the method of
(C) 特許文献３のロール周速に差をつける方法では、そのための特別な駆動装置が必要で、設備費が高くなる。一方、孔型ロールの胴径に差をつける方法は、素管の先端曲がり量に応じて孔型ロールを取り替える必要があり、生産性が極端に低くなるだけでなく、ロール原単位も著しく悪くなる。また、孔型ロールの取り替えを怠ると曲がりは改善されないだけでなく、かえって助長される。 (C) In the method of making a difference in the roll peripheral speed described in Patent Document 3, a special driving device for that is required, and the equipment cost becomes high. On the other hand, the method of making a difference in the diameter of the perforated roll requires that the perforated roll be replaced in accordance with the amount of bending of the tip of the raw tube, which not only results in extremely low productivity but also significantly reduces the roll basic unit. Become. Further, if the hole type roll is not replaced, not only the bending is not improved, but also it is promoted.
(D) 特許文献４の方法では、各スタンドに組み込まれた３個の孔型ロールの圧下位置を個別に調整するための特別な圧下位置調整機構が必要である。従って、３個の孔型ロールの圧下位置調整機構が機械的に連結されていて同時に同じ量だけ圧下位置を変位させる一般的な定径圧延機に比べ、設備費が格段に高くなる。 (D) The method of Patent Document 4 requires a special reduction position adjustment mechanism for individually adjusting the reduction positions of the three perforated rolls incorporated in each stand. Accordingly, the equipment cost is significantly higher than that of a general constant diameter rolling mill in which the reduction position adjusting mechanism for the three perforated rolls is mechanically connected and simultaneously the displacement position is displaced by the same amount.
(E) 特許文献５の発明の主たる目的は、定径圧延機に特有の内面角張りの改善にあり、曲がり防止は全く意図されていない。このため、曲がり防止の効果はない。
(E) The main object of the invention of
(F) 特許文献６の発明の主目的は管端割れ防止にあり、曲がり防止は全く意図されていないので、上記(F)の場合と同様に先端曲がりおよび深いエッジ疵は全く防止できない。 (F) The main object of the invention of Patent Document 6 is to prevent pipe end cracking, and it is not intended to prevent bending at all. Therefore, as in the case of (F), tip bending and deep edge wrinkles cannot be prevented at all.
上記のような事情から、冷却装置や孔型ロール個々の圧下位置調整用制御装置等の特別な装置の使用が不要で、しかも仕上げ用素管のセンター（重心位置）が定径圧延機の第１スタンドの孔型センターからずれた状態で挿入されても、大きな先端曲がりや深いエッジ疵の発生を防ぐことができる定径圧延方法の開発が望まれていた。 Due to the above circumstances, it is not necessary to use a special device such as a cooling device or a control device for adjusting the rolling position of each of the perforated rolls, and the center (center of gravity position) of the finishing tube is the first of the constant diameter rolling mill. There has been a demand for the development of a constant diameter rolling method capable of preventing the occurrence of large tip bending and deep edge wrinkles even when inserted in a state deviated from a single hole type center.
本発明は、上記の実状に鑑みてなされたもので、仕上げ用素管のセンター（重心位置）が定径圧延機の第１スタンドの孔型センターからずれていても、定径圧延後の管先端部分に大きな先端曲がりや深いエッジ疵が発生することがなく、しかも冷却装置や孔型ロール個々の圧下位置調整制御装置等の特別な装置の使用も不要な金属管の定径圧延方法を提供することを目的とする。 The present invention has been made in view of the above situation, and even if the center (center of gravity) of the finishing raw tube is displaced from the hole-type center of the first stand of the constant diameter rolling mill, the tube after constant diameter rolling Providing a constant diameter rolling method for metal tubes that does not cause large tip bending or deep edge wrinkles at the tip, and does not require the use of a special device such as a cooling device or a roll position adjustment control device for each hole roll. The purpose is to do.
本発明の要旨は、下記の金属管の定径圧延方法にある。 The gist of the present invention resides in the following constant diameter rolling method for metal pipes.
１スタンド内に複数個の孔型ロールが垂直面内に配置された複数スタンドからなる定径圧延機によって金属管を定径圧延する際、定径圧延機の第１スタンドの外径加工度ρ（％）および楕円率β（％）を、それぞれ、下記の式(1)および式(2)を満たす値とする金属管の定径圧延方法。 When a metal tube is subjected to constant diameter rolling by a constant diameter rolling mill composed of a plurality of stands in which a plurality of perforated rolls are arranged in a vertical plane within one stand, the outer diameter processing degree ρ of the first stand of the constant diameter rolling mill. (%) And ellipticity β (%) are constant diameter rolling methods for metal pipes with values satisfying the following formulas (1) and (2), respectively.
−５％≦ρ≦０％ ・・・・・・・ (1)
０％≦β≦５％ ・・・・・・・ (2)
上記の本発明においては、先端曲がりの程度およびエッジ疵の深さをより小さくすることができる。
-5% ≤ ρ ≤ 0 % (1)
0% ≦ β ≦ 5% ・ ・ ・ ・ ・ ・ ・ (2)
In the above invention, it is possible to further reduce the depth of the extent and edge flaws bending-edge.
本発明によれば、仕上げ用素管のセンターが定径圧延機の第１スタンドの孔型センターからずれて挿入されても、特別な制御装置を用いることなく、定径圧延後の管に発生する大きな先端曲がりおよび深いエッジ疵を確実に防止できる。 According to the present invention, even if the center of the blank for finishing is inserted with a deviation from the hole center of the first stand of the constant diameter rolling mill, it is generated in the tube after constant diameter rolling without using a special control device. It is possible to reliably prevent large tip bending and deep edge wrinkles.
本発明者らは、前記の課題を達成するために、種々実験研究を行い、次のことを知見して前記の本発明を完成させた。 In order to achieve the above-mentioned problems, the present inventors have conducted various experimental studies and have found the following to complete the present invention.
仕上げ用素管のセンター（重心位置）が定径圧延機の第１スタンドの孔型センターからずれて挿入された場合に、定径圧延後の管の圧延先端部分に大きな先端曲がりや深いエッジ疵が発生するのは、次の理由によることが判明した。 When the center (center of gravity) of the finishing tube is inserted with a deviation from the hole center of the first stand of the constant diameter rolling mill, a large tip bend or deep edge flaw is formed at the rolling tip of the tube after constant diameter rolling. It has been found that this occurs due to the following reasons.
図１は、仕上げ用素管のセンターが定径圧延機の第１スタンドの孔型センターからずれている場合に、定径圧延後の管に大きな先端曲がりが発生するメカニズムを説明するための図である。図示の例は、１スタンド内に３個の孔型ロール１−１、１−２、１−３が組み込まれた定径圧延機の第１スタンドを、定径圧延機の入側から見た孔型形状を示している。 FIG. 1 is a diagram for explaining a mechanism in which a large tip bend occurs in a tube after constant diameter rolling when the center of the finishing pipe is displaced from the hole center of the first stand of the constant diameter rolling mill. It is. In the illustrated example, the first stand of the constant diameter rolling mill in which three perforated rolls 1-1, 1-2, and 1-3 are incorporated in one stand is viewed from the entrance side of the constant diameter rolling mill. The hole shape is shown.
図１に示すように、３個の孔型ロール１−１、１−２、１−３で形成される孔型内にセンターがずれた状態で仕上げ用素管２が挿入された際には、素管２の軸心Ｇがパスセンターでもある孔型のセンターＰから、例えば、孔型ロール１−１の方向へずれた状態で噛み込む。このため、素管２の孔型ロール１−２、１−３に対する接触面積と孔型ロール１−１に対する接触面積との間に差が生じる。そして、接触面積が広い孔型ロール１−１の部分の材料の管軸方向への伸び量が、接触面積が狭い孔型ロール１−２および１−３の部分の材料の管軸方向への伸び量よりも大きくなる。その結果、圧延後の管の先端は、図２の（ａ）に示すように上方に曲がった形状になる。
As shown in FIG. 1, when the
以上の結果、図２の（ａ）に示すように、第１スタンドの出側では先端曲がりが孔型ロール１−１から遠ざかる方向に生じる。この状態で第２のスタンドのロールに噛み込むと、今度はロール１−２および１−３との接触部面積がロール１−１との接触部面積よりも大きくなるので、図２の（ｂ）に示すように、管の先端は下方へ曲がる。 As a result of the above, as shown in FIG. 2 (a), the bending of the tip occurs in the direction away from the perforated roll 1-1 on the exit side of the first stand. If it bites into the roll of a 2nd stand in this state, since the contact part area with rolls 1-2 and 1-3 becomes larger now than the contact part area with roll 1-1, (b of FIG. ), The tip of the tube bends downward.
この繰り返しが第３スタンド以降においても起こるために先端曲がりが解消されないだけでなく、合い隣り合う孔型ロールのフランジ面３、３間への材料噛み出しが著しくなって、深いエッジ疵が発生する。 Since this repetition also occurs after the third stand, not only the bending of the tip is not eliminated, but also the material bite between the flange surfaces 3 and 3 of adjacent hole rolls becomes remarkable, and deep edge wrinkles occur. .
そこで、この仕上げ用素管の先端曲がり、または管端部分の横断面形状が非真円形の場合に顕著に発生する先端曲がりと深いエッジ疵を、孔型ロール１−１、１−２および１−３の孔型形状の適正化によって解消することを試みた。 Therefore, the end bends and deep edge wrinkles that are conspicuously generated when the end tube of the finishing pipe or the cross-sectional shape of the tube end portion is non-circular are used as perforated rolls 1-1, 1-2 and 1 Attempted to solve the problem by optimizing the -3 hole shape.
具体的には、図３に示す寸法Ａと寸法Ｂ、即ち、孔型センター（パスセンター）Ｐと孔型溝端とロールフランジ面３との交点との間の距離であるフランジ寸法Ａと、パスセンターＰと孔型溝の溝底中央との間の距離である溝底寸法Ｂとに基づいて、下記の式(4)で定義される楕円率βを適正化するだけで先端曲がりをなくすべく、材質、寸法（外径、肉厚、長さ）、先端曲がりの程度が種々異なる仕上げ用素管を対象に多くの実験を行った。 Specifically, the dimension A and dimension B shown in FIG. 3, that is, the flange dimension A that is the distance between the hole center (pass center) P, the hole groove end and the intersection of the roll flange surface 3, and the path Based on the groove bottom dimension B, which is the distance between the center P and the center of the bottom of the hole-shaped groove, the tip bend should be eliminated simply by optimizing the ellipticity β defined by the following equation (4). Many experiments were conducted on finishing pipes with different materials, dimensions (outer diameter, wall thickness, length) and tip bending.
β＝｛（Ａ−Ｂ）／Ｂ｝×100（％） ・・・・・・・ (4)
その結果、図４に示す結果が得られた。図４は、横軸に上記の楕円率β、縦軸に下記の式(5)で定義される外径加工度ρ（％）をとって示す図で、これらが定径圧延後の管の先端曲がりとエッジ疵に及ぼす影響を示している。
β = {(A−B) / B} × 100 (%) (4)
As a result, the result shown in FIG. 4 was obtained. FIG. 4 is a diagram showing the above ellipticity β on the horizontal axis and the outer diameter processing degree ρ (%) defined by the following formula (5) on the vertical axis, and these are the results of the tube after constant diameter rolling. It shows the effect on tip bending and edge wrinkles.
ρ＝｛（Ｄ−Ｄ1）／Ｄ｝×100（％） ・・・・・・・ (5)
ただし、Ｄは仕上げ用素管２の平均外径（ｍｍ）、Ｄ1は定径圧延機の第１スタンドの孔型の平均径（ｍｍ）であり、平均外径Ｄはその断面形状が真円の場合は直径、非真円形で、例えば楕円形の場合は長径と短径の平均値、平均径Ｄ1は上記のＡ寸法とＢ寸法の和とする。
ρ = {(D−D 1 ) / D} × 100 (%) (5)
However, D is the average outer diameter (mm) of the finishing blank 2, D 1 is the average diameter (mm) of the hole shape of the first stand of the constant diameter rolling mill, and the average outer diameter D is true in cross-sectional shape. In the case of a circle, the diameter is a non-true circle. For example, in the case of an ellipse, the average value of the major axis and the minor axis, and the average diameter D 1 are the sum of the A and B dimensions.
図４からわかるように、外径加工度ρが−５％以上で３％以下、楕円率βが０％以上で５％以下の場合に限って、先端曲がり量ａを実用上全く問題にならない１．５ｍｍ未満にすることができ、しかも、エッジ疵も、実用上からは手入れ除去を必ずしも必要としない深さ０．２ｍｍ以下に抑制できることがわかった。 As can be seen from FIG. 4, the tip bend amount a is not a problem in practice only when the outer diameter processing degree ρ is −5% or more and 3% or less and the ellipticity β is 0% or more and 5% or less. It was found that the thickness can be made less than 1.5 mm, and the edge wrinkles can be suppressed to a depth of 0.2 mm or less, which does not necessarily require care removal from a practical point of view.
先端曲がり量ａとは、図５に示すように、長さ１ｍのストレートゲージ４の一端を管５の先端に一致させた状態で管をその軸心回りに回転させるか、またはストレートゲージを管軸心と平行に管の円周に添って移動させることにより測定されるストレートゲージと管の離間距離の最大値のことで、管端１ｍ当たりの曲がり量である。
As shown in FIG. 5, the tip bend amount a means that the tube is rotated around its axis with one end of the straight gauge 4 having a length of 1 m aligned with the tip of the
具体的に説明すると、外径加工度ρを−５％未満にすると、第１スタンドが圧延スタンドとしての機能を果たさない。言い換えれば、第１スタンドは空振りスタンドとなる。逆に、３％よりも大きくすると、孔型ロールに対する素管の接触面積が大きくなりすぎ、センターずれのない素管でも先端曲がりとエッジ疵が発生する場合があるだけでなく、素管のセンターが定径圧延機の第１スタンドの孔型センターからずれた状態で挿入されると、特定の孔型ロールに対する素管の接触面積が過大になり、当該特定の孔型ロールのフランジ面３部分への材料噛み出しが著しくなって１．５ｍｍを超える先端曲がりが発生するとともに、０．２ｍｍを超える深さのエッジ疵も発生する。 More specifically, when the outer diameter processing degree ρ is less than −5%, the first stand does not function as a rolling stand. In other words, the first stand is an empty swing stand. On the other hand, if it is larger than 3%, the contact area of the raw tube with the perforated roll becomes too large, and not only the center tube without misalignment may cause bending of the tip and edge flaws, but also the center of the raw tube. Is inserted in a state shifted from the hole center of the first stand of the constant diameter rolling mill, the contact area of the raw tube with respect to the specific hole roll becomes excessive, and the flange surface 3 portion of the specific hole roll The material biting into the surface becomes remarkable, leading to bending of the tip exceeding 1.5 mm, and edge wrinkles having a depth exceeding 0.2 mm.
また、楕円率βを０％未満にすると、孔型溝のフランジ面３に近い溝部分での負荷が大きくなりすぎ、エッジ疵が発生する場合があるだけでなく、孔型溝のフランジ面３に近い溝部分での負荷が著しく過大になって０．２ｍｍを超える深さのエッジ疵が発生する。逆に、５％よりも大きくすると、外径加工度ρを３％よりも大きくした場合と同様に、孔型ロールに対する素管の接触面積が大きくなりすぎ、先端曲がりとエッジ疵が発生する場合がある。さらに、特定の孔型ロールに対する素管の接触面積が過大になって当該特定の孔型ロールのフランジ面３部分への材料噛み出しが著しくなって１．５ｍｍを超える先端曲がりが発生するとともに、０．２ｍｍを超える深さのエッジ疵が発生する。 Further, when the ellipticity β is less than 0%, the load on the groove portion close to the flange surface 3 of the hole-shaped groove becomes too large, and not only edge flaws may occur, but also the flange surface 3 of the hole-shaped groove. As a result, the load in the groove portion close to is excessively large, and edge wrinkles having a depth exceeding 0.2 mm are generated. On the other hand, if the diameter is larger than 5%, the contact area of the blank tube with the perforated roll becomes too large, resulting in bending of the tip and edge wrinkles, as in the case where the outer diameter processing degree ρ is larger than 3%. There is. Furthermore, the contact area of the raw tube with respect to the specific hole-type roll becomes excessive, the material biting into the flange surface 3 part of the specific hole-type roll becomes remarkable, and a tip bending exceeding 1.5 mm occurs, Edge wrinkles with a depth exceeding 0.2 mm occur.
以上のことから、本発明では定径圧延機の第１スタンドの外径加工度ρと楕円率βを、それぞれ、前記の式(1)および式(2)を満たす値と定めた。 From the above, in the present invention, the outer diameter processing degree ρ and the ellipticity β of the first stand of the constant diameter rolling mill are determined as values satisfying the expressions (1) and (2), respectively.
なお、楕円率βが０％とは「Ａ寸法＝Ｂ寸法」のことであり、孔型形状が真円であることを意味し、βがプラス側に大きくなる程、「Ａ寸法＞Ｂ寸法」の程度が大きくなり、その孔型形状は、１スタンド内に配置される孔型ロールの数が３個の場合は三角形により近い形状になり、２個の場合は楕円比（長径／短径）のより大きい楕円形、４個の場合は四角形により近い形状になることを意味する。 An ellipticity β of 0% means “A dimension = B dimension”, which means that the hole shape is a perfect circle, and the larger β is on the positive side, the more “A dimension> B dimension. The hole shape is closer to a triangle when the number of hole rolls arranged in one stand is 3, and the elliptical ratio (major axis / minor axis) is two. ) Larger oval shape, and 4 means a shape closer to a quadrangle.
以上に説明した本発明の方法は、１スタンド内の孔型ロールの数が２個または４個の場合でも同様に適用可能であり、この場合でも同様の効果が得られることは、いうまでもない。 The method of the present invention described above can be similarly applied even when the number of perforated rolls in one stand is two or four, and it goes without saying that the same effect can be obtained even in this case. Absent.
外径、肉厚が表１に寸法で、前述した図５と同じ方法により測定される先端曲がり量がほぼ０ｍｍの１１種類の炭素鋼からなる仕上げ用素管を準備した。 A finishing blank made of 11 types of carbon steels having an outer diameter and a wall thickness as shown in Table 1 and having a tip bending amount of about 0 mm measured by the same method as in FIG. 5 was prepared.
準備した仕上げ用素管は、再加熱炉で１２３０℃に再加熱し、１２スタンドからなるストレッチレデユーサの第１スタンドの楕円率βと外径加工度ρを種々変えて定径圧延をおこなった。その際、外径２１０ｍｍの素管は外径１７７．８ｍｍ、肉厚８．０６ｍｍ、外径３８２ｍｍの素管は外径３２３．９ｍｍ、肉厚１１．５ｍｍの管に仕上げた。 The prepared finishing tube was reheated to 1230 ° C. in a reheating furnace, and constant diameter rolling was performed by changing the ellipticity β and the outer diameter processing degree ρ of the first stand of the stretch reducer comprising 12 stands. . At that time, the raw tube having an outer diameter of 210 mm was finished into a tube having an outer diameter of 177.8 mm and a wall thickness of 8.06 mm, and the raw tube having an outer diameter of 382 mm was an outer diameter of 323.9 mm and a wall thickness of 11.5 mm.
得られた管について、その先端曲がり量ａとエッジ疵の深さを調べた。先端曲がり量ａは、前述した図５に示す方法により測定し、先端曲がり量ａが１．５ｍｍ未満のものを良好（○）、１．５ｍｍ以上のものを不良（×）として評価した。エッジ疵は、圧延先端から１ｍ以内の間に発生していたエッジ疵の全てを対象にその深さを調べ、その全てが０．２ｍｍ未満であり、そのうちの半数以上が０．１ｍｍ未満であったものを優良（◎）、他を良（○）、０．２ｍｍ以上のものが１つでもあったものを不良（×）として評価した。 以上の結果を、第１スタンドの外径加工度ρと楕円率βと併せて表１に示した。 About the obtained pipe | tube, the tip bending amount a and the depth of the edge ridge were investigated. The tip bending amount a was measured by the method shown in FIG. 5 described above, and the tip bending amount a of less than 1.5 mm was evaluated as good (◯), and the tip bending amount a of 1.5 mm or more was evaluated as defective (×). The depth of edge wrinkles was examined for all edge wrinkles that occurred within 1 m from the rolling tip, and all of them were less than 0.2 mm, and more than half of them were less than 0.1 mm. Evaluations were made as good (◎), others good (◯), and any one with a thickness of 0.2 mm or more as bad (x). The above results are shown in Table 1 together with the outer diameter machining degree ρ and the ellipticity β of the first stand.
表１に示すように、本発明の方法によった場合（試番１および８）では、いずれも、先端曲がりの評価およびエッジ疵の評価とも良好である。特に、外径加工度ρを０％以下にした場合にその効果が顕著である。 As shown in Table 1, in the case of the method of the present invention (trial numbers 1 and 8 ), both the evaluation of the tip bending and the evaluation of the edge wrinkles are good. In particular, the effect is remarkable when the outer diameter processing degree ρ is 0% or less.
これに対し、外径加工度ρと楕円率βのいずれか一方または両方が本発明で規定する範囲を外れる場合は、大きな先端曲がりまたは／および深いエッジ疵が発生するか、第１スタンドでは外径加工が不可、即ち、第１スタンドが空振りスタンドとなることがわかる。 On the other hand, when either or both of the outer diameter machining degree ρ and the ellipticity β are out of the range defined in the present invention, large tip bending or / and deep edge wrinkles occur, or the first stand It can be seen that the diameter machining is not possible, that is, the first stand becomes an idle swing stand.
本発明方法によれば、特別な制御装置を用いることなく、定径圧延後の管に発生する先端曲がりおよびエッジ疵を確実に防止できる。本発明は、形状の良い管を高い歩留りで生産するのに大きく寄与する。 According to the method of the present invention, it is possible to reliably prevent tip bending and edge flaws occurring in a pipe after constant diameter rolling without using a special control device. The present invention greatly contributes to producing a well-shaped tube with a high yield.
１−１ 孔型ロール
１−２ 孔型ロール
１−３ 孔型ロール
２ 仕上げ用素管
３ フランジ面
Ｐ 孔型センター（パスセンター）
Ｇ 管軸心
４ ストレートゲージ
５ 管
1-1 Hole type roll 1-2 Hole type roll 1-3
G Tube axis 4 Straight gauge
5 pipes
Claims (1)
−５％≦ρ≦０％ ・・・・・・・ (1)
０％≦β≦５％ ・・・・・・・ (2) When a metal tube is subjected to constant diameter rolling by a constant diameter rolling mill composed of a plurality of stands in which a plurality of perforated rolls are arranged in a vertical plane within one stand, the outer diameter processing degree ρ of the first stand of the constant diameter rolling mill. (%) and ellipticity β to (%), respectively, the constant径圧extension method features and to Rukin genus tube to a value satisfying the equation (1) and (2) below.
-5% ≦ ρ ≦ 0% ・ ・ ・ ・ ・ ・ ・(1)
0% ≦ β ≦ 5% ・ ・ ・ ・ ・ ・ ・ (2)
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