WO2008056540A1 - Mandrel mill, its operating method, and seamless pipe manufacturing method - Google Patents

Mandrel mill, its operating method, and seamless pipe manufacturing method Download PDF

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Publication number
WO2008056540A1
WO2008056540A1 PCT/JP2007/070732 JP2007070732W WO2008056540A1 WO 2008056540 A1 WO2008056540 A1 WO 2008056540A1 JP 2007070732 W JP2007070732 W JP 2007070732W WO 2008056540 A1 WO2008056540 A1 WO 2008056540A1
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WIPO (PCT)
Prior art keywords
roll
stand
perforated
mandrel
curvature
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Application number
PCT/JP2007/070732
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French (fr)
Japanese (ja)
Inventor
Kenichi Sasaki
Original Assignee
Sumitomo Metal Industries, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Sumitomo Metal Industries, Ltd. filed Critical Sumitomo Metal Industries, Ltd.
Priority to EP07830466A priority Critical patent/EP2085158A4/en
Priority to US12/312,423 priority patent/US20100064753A1/en
Priority to BRPI0718203A priority patent/BRPI0718203A2/en
Publication of WO2008056540A1 publication Critical patent/WO2008056540A1/en
Priority to US12/563,229 priority patent/US20100132425A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
    • B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/03—Sleeved rolls
    • B21B27/035—Rolls for bars, rods, rounds, tubes, wire or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/02—Roll dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/02—Roll dimensions
    • B21B2267/06—Roll diameter

Definitions

  • the present invention relates to a mandrel mill that does not generate punching, roll slip wrinkles, bellows wrinkles and the like, a method of operating the same, and a method of manufacturing a seamless pipe.
  • a seamless pipe rolling mill there are usually 6 to 8 roll stands composed of a pair of upper and lower rolling rolls, and the roll hole type groove bottom direction of the front and rear stands is installed so as to intersect 90 °.
  • a mandrel mill is used.
  • a mandrel mill a mandrel bar is disposed in a roll hole type array formed by a plurality of roll stands, and a holo shell is continuously drawn and rolled.
  • FIG. 3 is a schematic diagram for explaining the overall configuration of the mandrel mill.
  • the mandrel mill has roll stands 11 to 14 each having a hole shape composed of a pair of rolling rolls 4, and a plurality of units (in the figure, each roll stand intersects each other by 90 °). 4 units) are connected in series.
  • the seamless pipe is manufactured by inserting a mandrel bar 3 into a hollow shell 2 previously perforated by a piercer and sequentially stretching and rolling the mandrel bar 3 at each of the roll stands 11 to 14.
  • the installed roll stands are the first stand (11 in the figure), the second stand (12 in the figure), the third stand (13 in the figure), and the fourth stand (in the figure in order) from the mill entry side. It is called 14) and is usually first reduced in thickness on the first stand.
  • Patent Document 1 a plurality of perforated roll stands are arranged to cross each other, and a mandrel bar is arranged in a roll perforated array formed by these perforated roll stands to roll a holo shell.
  • a mandrel bar is arranged in a roll perforated array formed by these perforated roll stands to roll a holo shell.
  • the ellipticity of the hole shape of the first and / or second stand is in the range of 1.25 to 1.40 is disclosed. According to the present invention, it is possible to prevent the occurrence of drilling defects and the occurrence of pipe end cracks.
  • Patent Document 2 a mandrel mill having a plurality of hole-shaped roll stands, a mandrel bar arranged in a roll hole-shaped array formed by the hole-shaped roll stands, and rolling a holo-shell,
  • the roll hole circumference of the 1st stand is the hot finish circumference of the pipe on the mill exit side. 1.
  • An invention that is more than 12 times the length is disclosed.
  • Patent Document 3 a mandrel mill having a plurality of hole-shaped roll stands, a mandrel bar arranged in a roll hole-shaped array formed by the hole-shaped roll stands, and rolling a holo-shell,
  • An invention in which the groove bottom radius of curvature of the roll hole shape of the first stand is 0.54 times or less of the roll groove bottom interval is disclosed.
  • Patent Document 4 a plurality of perforated roll stands are connected in series, a mandrel bar is arranged in a roll perforated array formed by these perforated roll stands, and a holo shell is continuously formed. Stretching and rolling mandrel mill, the roll hole mold of each stand, the ratio of the groove bottom radius of curvature R1 and the offset offset S between the groove bottom curvature center and the mill center R1 / S force 3 ⁇ 4 0 or more An invention in which the ellipticity of at least the second stand is 1.20 or less is disclosed.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2001-113306
  • Patent Document 2 Japanese Patent No. 2582705
  • Patent Document 3 Japanese Patent Publication No. 7-102369
  • Patent Document 4 Japanese Patent No. 2985719
  • Patent Document 1 describes that it is effective to limit the ellipticity of the hole type in order to prevent the drilling of the seamless pipe after the drawing and rolling. However, even if the ellipticity is adjusted, depending on the offset amount, wrinkles may occur in the seamless pipe after drawing and rolling.
  • Patent Document 2 discloses that the roll hole circumference of the first stand or further the second stand of the mandrel mill is limited to a certain range with respect to the hot finish circumference of the pipe on the mill exit side.
  • a technique for preventing a stripping error by forming an appropriate gap between the mandrel bar and the inner surface of the drawn and rolled hollow shell is disclosed.
  • the ellipticity and the offset are not taken into consideration, and there is a case where wrinkles occur in the seamless pipe after drawing and rolling.
  • Patent Document 3 describes that the occurrence of a drilling defect is suppressed. But offset If the ellipticity is not optimized by simply reducing the size of the steel sheet, wrinkles may occur in the seamless pipe after drawing and rolling.
  • An object of the present invention is to provide a mandrel mill in which the occurrence of wrinkles in a seamless pipe after drawing and rolling is small.
  • the gist of the present invention is the mandrel mill shown in the following (1), the mandrel mill operating method shown in the following (2), and the seamless pipe manufacturing method shown in the following (3).
  • a plurality of perforated roll stands are arranged in series, a mandrel bar is arranged in a roll perforated array formed by these perforated roll stands, and the holo-shell is continuously stretched under a stretching pressure.
  • a mandrel mill characterized in that at least the roll holes of the first stand and the second stand are arranged so as to satisfy the conditions represented by the following formulas (1) to (4): .
  • a is the ratio S / R1 of the groove bottom radius of curvature R1 of the perforated roll and the displacement offset amount S between the groove bottom curvature center and the mill center
  • b is the ellipticity.
  • a mandrel mill operating method in which a plurality of perforated roll stands are arranged in series, and a mandrel bar is arranged in a roll perforated array formed by these perforated roll stands.
  • the hollow shell groove radius of curvature R1, the displacement offset amount S, and the ellipticity in the first stand and the second stand satisfy the above formulas (1) to (4).
  • a mandrel mill operation method characterized by preventing the occurrence of drilling defects and wrinkles by continuously rolling and rolling the steel.
  • the hollow shell can be rolled with a good balance between offset and ellipticity, and therefore, the ability to suppress the occurrence of drilling defects and wrinkles in a seamless pipe after drawing and rolling. S can. Therefore, even when rolling thin-walled pipes, high-alloy steel pipes and the like that are prone to defects, the occurrence of defects such as necking can be suppressed.
  • the mandrel mill of the present invention comprises a plurality of perforated roll stands arranged in series, a mandrel bar is arranged in a roll perforated array formed by these perforated roll stands, and a hollow shell is continuously provided. It is a mandrel mill that is drawn and rolled.
  • a plurality of groups (in the figure, the roll stand 1 having a hole shape that also includes a pair of rolling rolls 4 forces intersect each other by 90 °. 4 units) are connected.
  • insert a mandrel bar 3 into a hollow shell 2 drilled in advance with a piercer, and place it on each roll stand! ;! ⁇ 14 are produced by drawing and rolling sequentially.
  • FIG. 4 is a schematic diagram showing a rolling situation of a holo-shell in a mandrel mill.
  • Figures 4 (a) to (f) show the rolling conditions of the hollow shells in the 1st to 6th stands, respectively.
  • omitted the hole-type roll is shown.
  • rolling is performed by continuously passing a hollow shell 2 with a mandrel bar 3 inserted between a pair of perforated rolls 4. Is called.
  • the wall thickness and diameter gradually decrease as it passes through the stand.
  • the hollow shell 2 is stretch-rolled by the perforated roll 4 and the mandrel bar 3. Specifically, the portion of the hollow shell 2 located at the bottom of the groove of the hole roll 4 (the portion where the hole hole 4 and the hollow shell 2 are in contact) is rolled, and the thickness is reduced. On the other hand, the portion of the hollow shell 2 located at the flange portion (the portion where the hole roll 4 and the hollow shell 2 are not in contact) is the portion of the hollow shell 2 located at the groove bottom. It is pulled by deformation in the direction of one shell axis and is extended in the direction of the hollow shell axis.
  • At least the roll hole types of the first stand and the second stand are the conditions represented by the following formulas (1) to (4): It is arranged so as to satisfy.
  • a is the ratio S / R1 of the groove bottom radius of curvature R1 of the perforated roll and the displacement offset amount S between the center of groove bottom curvature and the mill center
  • b is the ellipticity.
  • Fig. 1 shows the groove bottom radius of curvature R1 of the perforated roll and the displacement offset S between the groove bottom curvature center and the mill center.
  • Ellipticity is expressed by C / (R1-S) using the radius of curvature Rl shown in Fig. 1, the displacement offset S between this groove bottom curvature center and the mill center O, and the long diameter C of the hollow shell. Is done.
  • FIG. 2 shows the groove bottom radius of curvature R1 of the perforated roll and the groove in the mandrel mill of the present invention.
  • FIG. 5 is a diagram showing a relationship between a ratio S / Rl of a displacement curvature amount S between a center of bottom curvature and a mill center and an ellipticity. The figure shows the relationship in the first stand.
  • the mandrel mill of the present invention it is at least the first stand and the second stand that are arranged so that the hole-type roll satisfies the conditions represented by the above formulas (1) to (4). Only a hole type is required. This is generally the case for mandrel mill rolling with the first stand and the second stand. This is because the rolling reduction ratio of the stand is greater than that of the other stands, and the influence of the hole shape on the rolling is much greater than the influence of the hole shape after the third stand.
  • the hollow shell can be rolled with a good balance between the offset and the ellipticity, and therefore the ability to suppress the occurrence of drilling defects and wrinkles in the seamless pipe after drawing and rolling. S can. Therefore, even when rolling thin-walled pipes, high-alloy steel pipes and the like that are prone to defects, the occurrence of defects such as necking can be suppressed.
  • FIG. 1 is a schematic diagram showing a positional relationship among a hole-type roll, a holo-shell, and a mandrel bar in the mandrel mill of the present invention.
  • FIG. 2 In the mandrel mill of the present invention, the relationship between the ellipticity and the ratio S / R1 of the groove bottom radius of curvature R1 of the perforated roll and the displacement offset amount S between the groove bottom curvature center and the mill center.
  • FIG. 3 is a schematic diagram illustrating the overall configuration of a mandrel mill.
  • FIG. 4 is a schematic diagram showing the rolling status of seamless pipes in a mandrel mill, and (a) to (f) show the rolling status of seamless pipes in the first to sixth stands, respectively.

Abstract

Intended is to provide a mandrel mill capable of manufacturing a seamless pipe having no flaw such as a necking flaw. The mandrel mill has a plurality of hole type roll stands installed consecutively, and a mandrel bar (3) is arranged in the forging roll die formed of those hole type roll stands, thereby to draw and roll a hollow shell (2) continuously. A roll die (4) for at least a first stand and a second stand is arranged to satisfy the conditions expressed by the following Formulas (1) to (4): b ≤ 10a + 1.5... (1); b ≥ 10a - 0.2... (2); b ≤ -a + 1.5... (3); and b ≥ -a + 1.15... (4), wherein a = S/R1, and b = C/(R1 - S).

Description

明 細 書  Specification
マンドレルミルおよびその操業方法ならびに継目無管の製造方法 技術分野  Mandrel mill, its operating method and seamless pipe manufacturing method
[0001] 本発明は、穴明き、ロールスリップ疵、蛇腹疵等を発生させないマンドレルミルおよ びその操業方法ならびに継目無管の製造方法に関する。  TECHNICAL FIELD [0001] The present invention relates to a mandrel mill that does not generate punching, roll slip wrinkles, bellows wrinkles and the like, a method of operating the same, and a method of manufacturing a seamless pipe.
背景技術  Background art
[0002] 継目無管の圧延機としては、通常、上下一対の圧延ロールからなるロールスタンド を 6〜8基有し、前後スタンドのロール孔型の溝底方向が 90° 交差するように設置し たマンドレルミルが用いられる。マンドレルミルでは、これら複数のロールスタンドで形 成するロール孔型の配列内にマンドレルバ一を配置して、ホロ一シェルが連続的に 延伸圧延される。  [0002] As a seamless pipe rolling mill, there are usually 6 to 8 roll stands composed of a pair of upper and lower rolling rolls, and the roll hole type groove bottom direction of the front and rear stands is installed so as to intersect 90 °. A mandrel mill is used. In a mandrel mill, a mandrel bar is disposed in a roll hole type array formed by a plurality of roll stands, and a holo shell is continuously drawn and rolled.
[0003] 図 3は、マンドレルミルの全体構成を説明する模式図である。同図に示すように、マ ンドレルミルは、一対の圧延ロール 4から構成される孔型を有するロールスタンド 11 〜； 14を有し、各ロールスタンドが互いに 90° 交差するように複数基（図では、 4基）が 連設されている。継目無管は、事前にピアサ一で穿孔されたホロ一シェル 2にマンド レルバー 3を揷入して、これを各ロールスタンド 11〜； 14で順次延伸圧延して製造さ れる。設置されたロールスタンドは、ミル入側から順に第 1スタンド（図中の 11)、第 2 スタンド（図中の 12)、第 3スタンド（図中の 13)、および第 4スタンド（図中の 14)と呼 ばれ、通常、第 1スタンドで最初に肉厚圧下される。  FIG. 3 is a schematic diagram for explaining the overall configuration of the mandrel mill. As shown in the figure, the mandrel mill has roll stands 11 to 14 each having a hole shape composed of a pair of rolling rolls 4, and a plurality of units (in the figure, each roll stand intersects each other by 90 °). 4 units) are connected in series. The seamless pipe is manufactured by inserting a mandrel bar 3 into a hollow shell 2 previously perforated by a piercer and sequentially stretching and rolling the mandrel bar 3 at each of the roll stands 11 to 14. The installed roll stands are the first stand (11 in the figure), the second stand (12 in the figure), the third stand (13 in the figure), and the fourth stand (in the figure in order) from the mill entry side. It is called 14) and is usually first reduced in thickness on the first stand.
[0004] 特許文献 1には、複数の孔型ロールスタンドを交差して連設し、これらの孔型ロール スタンドが形成するロール孔型配列内にマンドレルバ一を配置してホロ一シェルを圧 延するマンドレルミルにおいて、第 1または/および第 2スタンドの孔型の楕円度を 1 . 25〜； 1. 40の範囲とする発明が開示されている。この発明では、穴明き欠陥の発生 と管端割れの発生を防止することができる。  [0004] In Patent Document 1, a plurality of perforated roll stands are arranged to cross each other, and a mandrel bar is arranged in a roll perforated array formed by these perforated roll stands to roll a holo shell. In the mandrel mill, an invention in which the ellipticity of the hole shape of the first and / or second stand is in the range of 1.25 to 1.40 is disclosed. According to the present invention, it is possible to prevent the occurrence of drilling defects and the occurrence of pipe end cracks.
[0005] 特許文献 2には、複数の穴形ロールスタンドを有し、それら穴形ロールスタンドが形 成するロール穴形配列内にマンドレルバ一を配置し、ホロ一シェルを圧延するマンド レルミルにおいて、第 1スタンドのロール穴形周長を、ミル出側の管の熱間仕上げ周 長に対する 1. 12倍以上とする発明が開示されている。 [0005] In Patent Document 2, a mandrel mill having a plurality of hole-shaped roll stands, a mandrel bar arranged in a roll hole-shaped array formed by the hole-shaped roll stands, and rolling a holo-shell, The roll hole circumference of the 1st stand is the hot finish circumference of the pipe on the mill exit side. 1. An invention that is more than 12 times the length is disclosed.
[0006] 特許文献 3には、複数の穴形ロールスタンドを有し、それら穴形ロールスタンドが形 成するロール穴形配列内にマンドレルバ一を配置し、ホロ一シェルを圧延するマンド レルミルにおいて、第 1スタンドのロール穴形の溝底曲率半径がロール溝底間隔の 0 . 54倍以下である発明が開示されている。 [0006] In Patent Document 3, a mandrel mill having a plurality of hole-shaped roll stands, a mandrel bar arranged in a roll hole-shaped array formed by the hole-shaped roll stands, and rolling a holo-shell, An invention in which the groove bottom radius of curvature of the roll hole shape of the first stand is 0.54 times or less of the roll groove bottom interval is disclosed.
[0007] 特許文献 4には、複数の孔型ロールスタンドを連設してなり、これら孔型ロールスタ ンドで形成されたロール孔型配列内にマンドレルバ一を配し、ホロ一シェルを連続的 に延伸圧延するマンドレルミルであって、各スタンドのロール孔型を、その溝底曲率 半径 R1と、この溝底曲率中心とミルセンターとの偏位オフセット量 Sとの比 R1/S力 ¾ 0以上であり、少なくとも第 2スタンドの楕円度を 1. 20以下とした発明が開示されてい [0007] In Patent Document 4, a plurality of perforated roll stands are connected in series, a mandrel bar is arranged in a roll perforated array formed by these perforated roll stands, and a holo shell is continuously formed. Stretching and rolling mandrel mill, the roll hole mold of each stand, the ratio of the groove bottom radius of curvature R1 and the offset offset S between the groove bottom curvature center and the mill center R1 / S force ¾ 0 or more An invention in which the ellipticity of at least the second stand is 1.20 or less is disclosed.
[0008] 特許文献 1：特開 2001— 113306号公報 [0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2001-113306
特許文献 2：特許第 2582705号公報  Patent Document 2: Japanese Patent No. 2582705
特許文献 3：特公平 7— 102369号公報  Patent Document 3: Japanese Patent Publication No. 7-102369
特許文献 4 :特許第 2985719号公報  Patent Document 4: Japanese Patent No. 2985719
発明の開示  Disclosure of the invention
発明が解決しょうとする課題  Problems to be solved by the invention
[0009] 特許文献 1には、延伸圧延後の継目無管に穴明きが発生することを防止するため には、孔型の楕円度を制限するのが有効であると記載されている。しかし、楕円度を 調整しても、オフセット量によっては、延伸圧延後の継目無管に疵が発生する場合が ある。 [0009] Patent Document 1 describes that it is effective to limit the ellipticity of the hole type in order to prevent the drilling of the seamless pipe after the drawing and rolling. However, even if the ellipticity is adjusted, depending on the offset amount, wrinkles may occur in the seamless pipe after drawing and rolling.
[0010] 特許文献 2には、マンドレルミルの第 1スタンドまたは更に第 2スタンドのロール孔形 周長を、ミル出側の管の熱間仕上げ周長に対して一定の範囲に制限することで、マ ンドレルバ一と延伸圧延されているホロ一シェル内面との間に適正な空隙を形成して 、ストリツビングミスを防止する技術が開示されている。しかし、楕円度、更には、オフ セットについて考慮されておらず、延伸圧延後の継目無管に疵が発生する場合があ  [0010] Patent Document 2 discloses that the roll hole circumference of the first stand or further the second stand of the mandrel mill is limited to a certain range with respect to the hot finish circumference of the pipe on the mill exit side. A technique for preventing a stripping error by forming an appropriate gap between the mandrel bar and the inner surface of the drawn and rolled hollow shell is disclosed. However, the ellipticity and the offset are not taken into consideration, and there is a case where wrinkles occur in the seamless pipe after drawing and rolling.
[0011] 特許文献 3には、穴明き欠陥の発生は抑制されると記載されている。しかし、オフセ ットを小さくするだけで楕円度を適正にしなければ、延伸圧延後の継目無管に疵が 発生する場合がある。 [0011] Patent Document 3 describes that the occurrence of a drilling defect is suppressed. But offset If the ellipticity is not optimized by simply reducing the size of the steel sheet, wrinkles may occur in the seamless pipe after drawing and rolling.
[0012] 特許文献 4に開示されたマンドレルミルでは、楕円度も、オフセットも所定範囲に制 限することにより、ネッキング現象の発生を抑制し、穴明き欠陥を低減することができ ると記載されている。しかし、楕円度とオフセットとの関係については、示唆されてい ない。  [0012] In the mandrel mill disclosed in Patent Document 4, it is described that the occurrence of necking phenomenon can be suppressed and the drilling defects can be reduced by limiting the ellipticity and the offset to a predetermined range. Has been. However, there is no suggestion of the relationship between ellipticity and offset.
[0013] 本発明者は、従来技術の問題を解決するべく研究を重ねた結果、延伸圧延後の継 目無管の疵発生を防止するのに有効な楕円度およびオフセットのバランスを見出し、 本発明を完成させた。本発明は、延伸圧延後の継目無管の疵発生が少ないマンドレ ルミルを提供することを目的とする。  [0013] As a result of repeated research to solve the problems of the prior art, the present inventor has found a balance between ellipticity and offset effective in preventing the occurrence of wrinkles in seamless pipes after drawing and rolling. Completed the invention. An object of the present invention is to provide a mandrel mill in which the occurrence of wrinkles in a seamless pipe after drawing and rolling is small.
課題を解決するための手段  Means for solving the problem
[0014] 本発明は、下記（1)に示すマンドレルミル、下記（2)に示すマンドレルミルの操業方 法および下記（3)に示す継目無管の製造方法を要旨とする。  The gist of the present invention is the mandrel mill shown in the following (1), the mandrel mill operating method shown in the following (2), and the seamless pipe manufacturing method shown in the following (3).
[0015] (1)複数の孔型ロールスタンドを連設してなり、これらの孔型ロールスタンドで形成 されたロール孔型配列内にマンドレルバ一を配し、ホロ一シェルを連続的に延伸圧 延するマンドレルミルであって、少なくとも第 1スタンドおよび第 2スタンドのロール孔 型を、下記の (1)式〜 (4)式で示される条件を満たすように配置することを特徴とするマ ンドレルミル。  [0015] (1) A plurality of perforated roll stands are arranged in series, a mandrel bar is arranged in a roll perforated array formed by these perforated roll stands, and the holo-shell is continuously stretched under a stretching pressure. A mandrel mill characterized in that at least the roll holes of the first stand and the second stand are arranged so as to satisfy the conditions represented by the following formulas (1) to (4): .
[0016] b≤10a+ l . 5 …ひ)  [0016] b≤10a + l. 5… hi)
b≥10a-0. 2 · ' ·(2)  b≥10a-0. 2
b≤-a+ l . 5 · ' ·(3)  b≤-a + l .5
b≥-a+ l . 15 · ' ·(4)  b≥-a + l. 15 · '· (4)
[0017] 但し、式中の aは、孔型ロールの溝底曲率半径 R1とこの溝底曲率中心とミルセンタ 一との変位オフセット量 Sとの比 S/R1であり、 bは楕円度である。  [0017] where a is the ratio S / R1 of the groove bottom radius of curvature R1 of the perforated roll and the displacement offset amount S between the groove bottom curvature center and the mill center, and b is the ellipticity. .
[0018] (2)複数の孔型ロールスタンドを連設してなり、これらの孔型ロールスタンドで形成 されたロール孔型配列内にマンドレルバ一を配したマンドレルミルの操業方法であつ て、少なくとも第 1スタンドおよび第 2スタンドにおける孔型ロールの溝底曲率半径 R1 、変位オフセット量 Sおよび楕円度が上記の (1)式〜 (4)式を満たす条件でホローシェ ルを連続的に延伸圧延することにより穴明き欠陥および疵の発生を防止することを特 徴とするマンドレルミルの操業方法。 [0018] (2) A mandrel mill operating method in which a plurality of perforated roll stands are arranged in series, and a mandrel bar is arranged in a roll perforated array formed by these perforated roll stands. The hollow shell groove radius of curvature R1, the displacement offset amount S, and the ellipticity in the first stand and the second stand satisfy the above formulas (1) to (4). A mandrel mill operation method characterized by preventing the occurrence of drilling defects and wrinkles by continuously rolling and rolling the steel.
[0019] (3)複数の孔型ロールスタンドを連設してなり、これらの孔型ロールスタンドで形成 されたロール孔型配列内にマンドレルバ一を配したマンドレルミルを用いて継目無管 を製造する方法であって、少なくとも第 1スタンドおよび第 2スタンドにおける孔型ロー ルの溝底曲率半径 Rl、変位オフセット量 Sおよび楕円度が上記の (1)式〜 (4)式を満 たす条件でホロ一シェルを連続的に延伸圧延することを特徴とする継目無管の製造 方法。 [3] (3) Manufactures seamless pipes using a mandrel mill in which a plurality of perforated roll stands are connected and a mandrel bar is arranged in a roll perforated array formed by these perforated roll stands. The groove bottom radius of curvature Rl, displacement offset amount S, and ellipticity of the hole type rolls in at least the first stand and the second stand satisfy the above formulas (1) to (4). A method for producing a seamless pipe, characterized in that the hollow shell is continuously drawn and rolled.
発明の効果  The invention's effect
[0020] 本発明によれば、オフセットおよび楕円度のバランスが良い状態でホロ一シェルの 圧延ができるので、延伸圧延後の継目無管に穴明き欠陥および疵の発生を抑制す ること力 Sできる。よって、欠陥が生じやすい薄肉管、高合金鋼管等を圧延する場合で も、ネッキング等の疵の発生を抑制できる。  [0020] According to the present invention, the hollow shell can be rolled with a good balance between offset and ellipticity, and therefore, the ability to suppress the occurrence of drilling defects and wrinkles in a seamless pipe after drawing and rolling. S can. Therefore, even when rolling thin-walled pipes, high-alloy steel pipes and the like that are prone to defects, the occurrence of defects such as necking can be suppressed.
発明を実施するための最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION
[0021] 本発明のマンドレルミルは、複数の孔型ロールスタンドを連設してなり、これらの孔 型ロールスタンドで形成されたロール孔型配列内にマンドレルバ一を配し、ホローシ エルを連続的に延伸圧延するマンドレルミルである。  [0021] The mandrel mill of the present invention comprises a plurality of perforated roll stands arranged in series, a mandrel bar is arranged in a roll perforated array formed by these perforated roll stands, and a hollow shell is continuously provided. It is a mandrel mill that is drawn and rolled.
[0022] 前掲の図 3に示すように、本発明のマンドレルミルにおいても、一対の圧延ロール 4 力も構成される孔型を有するロールスタンド 1が互いに 90° 交差するように複数基（ 図では、 4基）が連設してなる。継目無管は、事前にピアサ一で穿孔されたホローシェ ル 2にマンドレルバ一 3を揷入して、これを各ロールスタンド;！;!〜 14で順次延伸圧延 して製造される。 [0022] As shown in FIG. 3 above, in the mandrel mill of the present invention, a plurality of groups (in the figure, the roll stand 1 having a hole shape that also includes a pair of rolling rolls 4 forces intersect each other by 90 °. 4 units) are connected. For seamless pipes, insert a mandrel bar 3 into a hollow shell 2 drilled in advance with a piercer, and place it on each roll stand! ;! ~ 14 are produced by drawing and rolling sequentially.
[0023] 図 4は、マンドレルミルにおけるホロ一シェルの圧延状況を示す模式図である。図 4 の (a)〜(f)は、それぞれ第 1〜第 6スタンドにおけるホロ一シェルの圧延状況を示す。 なお、（b)〜(f)においては、孔型ロールを省略した図を示している。また、図 4では、 6 スタンドのマンドレルミルの例を示す力 スタンド数には制限はない。  [0023] FIG. 4 is a schematic diagram showing a rolling situation of a holo-shell in a mandrel mill. Figures 4 (a) to (f) show the rolling conditions of the hollow shells in the 1st to 6th stands, respectively. In addition, in (b)-(f), the figure which abbreviate | omitted the hole-type roll is shown. Also, in Fig. 4, there is no limit to the number of force stands that shows an example of a 6-stand mandrel mill.
[0024] 図 4に示すように、本発明のマンドレルミルにおいては、一対の孔型ロール 4間に、 マンドレルバ一 3を揷入したホロ一シェル 2を連続的に通過させることにより圧延が行 われる。そして、その肉厚および径は、スタンドを通過する毎に徐々に小さくなつていAs shown in FIG. 4, in the mandrel mill of the present invention, rolling is performed by continuously passing a hollow shell 2 with a mandrel bar 3 inserted between a pair of perforated rolls 4. Is called. The wall thickness and diameter gradually decrease as it passes through the stand.
<。 <.
[0025] 図 3に示すように、マンドレルミルにおいて、ホロ一シェル 2は孔型ロール 4とマンド レルバー 3とによって延伸圧延される。具体的には、孔型ロール 4の溝底部（孔型口 ール 4とホロ一シェル 2とが接している部分）に位置するホロ一シェル 2の部分が圧延 され、肉厚が減少する。一方、フランジ部（孔型ロール 4とホロ一シェル 2とが接してい ない部分）に位置するホロ一シェル 2の部分は、溝底部に位置するホロ一シェル 2の 部分の圧延されることによるホロ一シェル軸方向への変形によって引っ張られて、ホ ローシェル軸方向に延ばされる。  As shown in FIG. 3, in the mandrel mill, the hollow shell 2 is stretch-rolled by the perforated roll 4 and the mandrel bar 3. Specifically, the portion of the hollow shell 2 located at the bottom of the groove of the hole roll 4 (the portion where the hole hole 4 and the hollow shell 2 are in contact) is rolled, and the thickness is reduced. On the other hand, the portion of the hollow shell 2 located at the flange portion (the portion where the hole roll 4 and the hollow shell 2 are not in contact) is the portion of the hollow shell 2 located at the groove bottom. It is pulled by deformation in the direction of one shell axis and is extended in the direction of the hollow shell axis.
[0026] すなわち、フランジ部に位置するホロ一シェル 2の部分では、内面圧力を受けず、 外面圧力もほとんど受けないため、ホロ一シェル軸方向の引張り力のみを受ける単軸 引張りに近い状態となる。このため、フランジ部に位置するホロ一シェル 2の部分には 、肉厚が部分的に減少する、いわゆるネッキング現象が生じ易い。このネッキング現 象が著しく発生する場合、延伸圧延中のホロ一シェルが破断して穴明きが生じる。  [0026] That is, in the portion of the holo-shell 2 located in the flange portion, the inner surface pressure is not received and the outer surface pressure is hardly received. Become. For this reason, a so-called necking phenomenon in which the thickness is partially reduced tends to occur in the portion of the hollow shell 2 located in the flange portion. When this necking phenomenon occurs remarkably, the hollow shell during the drawing and rolling breaks and a hole is formed.
[0027] 本発明のマンドレルミルでは、このような問題が生じないように、少なくとも第 1スタン ドおよび第 2スタンドのロール孔型を、下記の (1)式〜 (4)式で示される条件を満たすよ うに配置してある。  [0027] In the mandrel mill of the present invention, in order not to cause such a problem, at least the roll hole types of the first stand and the second stand are the conditions represented by the following formulas (1) to (4): It is arranged so as to satisfy.
[0028] b≤10a+ l . 5 …ひ）  [0028] b≤10a + l. 5… hi)
b≥10a-0. 2 · ' ·(2)  b≥10a-0. 2
b≤-a+ l . 5 · ' ·(3)  b≤-a + l .5
b≥-a+ l . 15 · ' ·(4)  b≥-a + l. 15 · '· (4)
[0029] 但し、式中の aは、孔型ロールの溝底曲率半径 R1とこの溝底曲率中心とミルセンタ 一との変位オフセット量 Sとの比 S/R1であり、 bは楕円度である。孔型ロールの溝底 曲率半径 R1およびこの溝底曲率中心とミルセンターとの変位オフセット量 Sは、図 1 に示すとおりである。また、楕円度は、図 1に示される率半径 Rl、この溝底曲率中心 とミルセンター Oとの変位オフセット量 Sおよびホロ一シェルの長径 Cとを用い、 C/ ( R1— S)で表される。  [0029] where a is the ratio S / R1 of the groove bottom radius of curvature R1 of the perforated roll and the displacement offset amount S between the center of groove bottom curvature and the mill center, and b is the ellipticity. . Fig. 1 shows the groove bottom radius of curvature R1 of the perforated roll and the displacement offset S between the groove bottom curvature center and the mill center. Ellipticity is expressed by C / (R1-S) using the radius of curvature Rl shown in Fig. 1, the displacement offset S between this groove bottom curvature center and the mill center O, and the long diameter C of the hollow shell. Is done.
[0030] 図 2は、本発明のマンドレルミルにおける、孔型ロールの溝底曲率半径 R1とこの溝 底曲率中心とミルセンターとの変位オフセット量 Sとの比 S/Rlと、楕円度との関係を 示す図である。なお、図に示すのは、第 1スタンドにおける関係である。 FIG. 2 shows the groove bottom radius of curvature R1 of the perforated roll and the groove in the mandrel mill of the present invention. FIG. 5 is a diagram showing a relationship between a ratio S / Rl of a displacement curvature amount S between a center of bottom curvature and a mill center and an ellipticity. The figure shows the relationship in the first stand.
[0031] 図 2に示すように、上記（1)式を満足しない場合、即ち、楕円度 bに対する比 S/R1 の値が小さすぎる場合には、孔型ロールに対して延伸圧延中のホロ一シェルが未充 満の状態となる。未充満とは、延伸圧延中のホロ一シェルの外周長が十分に広がら ず、孔型周長（投影された孔型プロフィルの外周の長さ）に対して小さくなり過ぎる状 態を意味し、アンダーフィルとも呼ばれる。未充満の状態となると、楕円度が大きいに も拘わらずバー引き抜き不良（ストリツビング不良）が発生したり、ネッキングによる穴 明き不良が発生したりする。  [0031] As shown in FIG. 2, when the above formula (1) is not satisfied, that is, when the value of the ratio S / R1 to the ellipticity b is too small, the hollow being stretch-rolled with respect to the perforated roll is not obtained. One shell is unfilled. Unfilled means that the outer perimeter of the hollow shell during drawing and rolling is not sufficiently widened and becomes too small for the perimeter of the perforation (the perimeter of the projected perforation profile) Also called underfill. If it becomes unfilled, the bar pulling failure (stripping failure) may occur even though the ellipticity is large, or the drilling failure due to necking may occur.
[0032] 上記（2)式を満足しない場合、即ち、楕円度 bに対する比 S/R1の値が大きすぎる 場合には、孔型ロールに対して延伸圧延中のホロ一シェルが過充満の状態となる。 過充満とは、延伸圧延中のホロ一シェルの外周長が広がり過ぎ、孔型フランジ部から 嚙み出す状態を意味し、オーバーフィルとも呼ばれる。過充満の状態となると、孔型 フランジからホロ一シェルが嚙み出し、ホロ一シェル表面に焼き付き疵が発生する。ま た、ホロ一シェルの次スタンドのロール溝底部に対応する部分の進行速度がロール 溝底部の周速度よりも遅くなる現象が起き、ホロ一シェルに折れ込み状の疵が発生 する。  [0032] When the above formula (2) is not satisfied, that is, when the value of the ratio S / R1 to the ellipticity b is too large, the hollow shell being stretch-rolled is overfilled with respect to the perforated roll. It becomes. Overfilling means a state in which the outer peripheral length of the holo-shell during stretch rolling is too wide and squeezes out from the hole-type flange, and is also called overfill. When overfilled, the holo shell oozes out of the perforated flange, and seizure flaws occur on the holo shell surface. In addition, a phenomenon occurs in which the traveling speed of the portion corresponding to the bottom of the roll groove of the next stand of the holo-shell is slower than the peripheral speed of the bottom of the roll groove, and a folded wrinkle occurs in the holo-shell.
[0033] 上記（3)式を満足しない場合、即ち、比 S/R1に対する楕円度 bの値が大きすぎる 場合にも、オーバーフィルの状態となる。この場合、孔型フランジカも延伸圧延中の ホロ一シェルが嚙み出し焼き付き、表面に焼き付き疵が発生する。また、ホローシェ ルの進行速度が次スタンドにおいてロール溝底部の周速度よりも遅くなる現象が起き 、ホロ一シェルに折れ込み状の疵が発生する。  [0033] When the above formula (3) is not satisfied, that is, when the value of the ellipticity b with respect to the ratio S / R1 is too large, an overfill state occurs. In this case, the hole-type flanger also squeezes and seizes the hollow shell being stretched and rolled, resulting in seizure on the surface. In addition, a phenomenon that the traveling speed of the hollow shell becomes slower than the peripheral speed of the bottom of the roll groove in the next stand occurs, and a folded wrinkle is generated in the hollow shell.
[0034] 上記 (4)式を満足しない場合、即ち、比 S/R1に対する楕円度 bの値が小さすぎる 場合には、アンダーフィルの状態となる。この場合、バー引き抜き不良（ストリツビング 不良）の発生、または、ネッキングによる穴明き不良の発生という問題が生じる。  [0034] When the above equation (4) is not satisfied, that is, when the value of the ellipticity b with respect to the ratio S / R1 is too small, an underfill state occurs. In this case, there arises a problem that a bar pull-out failure (stripping failure) or a hole-drilling due to necking occurs.
[0035] 本発明のマンドレルミルにおいては、孔型ロールを上記の（1)式〜（4)式で示され る条件を満たすように配置するのは、少なくとも第 1スタンドおよび第 2スタンドのロー ル孔型をだけでよい。これは、一般的にマンドレルミル圧延では第 1スタンドと第 2スタ ンドの圧下率が他スタンドよりも大きいため、その孔型形状が圧延に及ぼす影響は、 第 3スタンド以降の孔型形状の影響よりも格段に大きいからである。 [0035] In the mandrel mill of the present invention, it is at least the first stand and the second stand that are arranged so that the hole-type roll satisfies the conditions represented by the above formulas (1) to (4). Only a hole type is required. This is generally the case for mandrel mill rolling with the first stand and the second stand. This is because the rolling reduction ratio of the stand is greater than that of the other stands, and the influence of the hole shape on the rolling is much greater than the influence of the hole shape after the third stand.
[0036] 以上のように、比 S/R1と楕円度とを別々に規定したのでは、圧延における種々の 問題を改善することができない場合がある。本発明は、上記 (1)〜(4)で示される関係 を満足する条件でマンドレルミルを操業することにより、穴明き欠陥も疵もない継目無 管を安定的に製造することができる。 [0036] As described above, if the ratio S / R1 and the ellipticity are separately defined, various problems in rolling may not be improved. According to the present invention, by operating the mandrel mill under the conditions satisfying the relationships shown in the above (1) to (4), it is possible to stably produce a seamless pipe free from perforation defects.
産業上の利用可能性  Industrial applicability
[0037] 本発明によれば、オフセットおよび楕円度のバランスが良い状態でホロ一シェルの 圧延ができるので、延伸圧延後の継目無管に穴明き欠陥および疵の発生を抑制す ること力 Sできる。よって、欠陥が生じやすい薄肉管、高合金鋼管等を圧延する場合で も、ネッキング等の疵の発生を抑制できる。 [0037] According to the present invention, the hollow shell can be rolled with a good balance between the offset and the ellipticity, and therefore the ability to suppress the occurrence of drilling defects and wrinkles in the seamless pipe after drawing and rolling. S can. Therefore, even when rolling thin-walled pipes, high-alloy steel pipes and the like that are prone to defects, the occurrence of defects such as necking can be suppressed.
図面の簡単な説明  Brief Description of Drawings
[0038] [図 1]本発明のマンドレルミルにおける、孔型ロール、ホロ一シェルおよびマンドレル バーの位置関係を示す模式図である。  FIG. 1 is a schematic diagram showing a positional relationship among a hole-type roll, a holo-shell, and a mandrel bar in the mandrel mill of the present invention.
[図 2]本発明のマンドレルミルにおける、孔型ロールの溝底曲率半径 R1とこの溝底曲 率中心とミルセンターとの変位オフセット量 Sとの比 S/R1と、楕円度との関係を示す 図である。  [Fig. 2] In the mandrel mill of the present invention, the relationship between the ellipticity and the ratio S / R1 of the groove bottom radius of curvature R1 of the perforated roll and the displacement offset amount S between the groove bottom curvature center and the mill center. FIG.
[図 3]マンドレルミルの全体構成を説明する模式図である。  FIG. 3 is a schematic diagram illustrating the overall configuration of a mandrel mill.
[図 4]マンドレルミルにおける継目無管の圧延状況を示す模式図であり、（a)〜(f)は、 それぞれ第 1〜第 6スタンドにおける継目無管の圧延状況を示す。  FIG. 4 is a schematic diagram showing the rolling status of seamless pipes in a mandrel mill, and (a) to (f) show the rolling status of seamless pipes in the first to sixth stands, respectively.
符号の説明  Explanation of symbols
[0039] 11、 12、 13、 14. ローノレスタンド [0039] 11, 12, 13, 14. Ronole stand
2.ホローシェノレ  2.Hollow Shenole
3. マンドレルバ一  3. Mandrelba
4.孔型ローノレ  4.Hole type ronore
R1.溝底曲率中心  R1. Center of groove bottom curvature
O.ミルセンター  O. Mill Center
5.溝底曲率中心とミルセンターとの変位オフセット量 c.管材の長径 5. Displacement offset between the groove bottom curvature center and the mill center c.Long diameter of pipe material

Claims

請求の範囲 The scope of the claims
[1] 複数の孔型ロールスタンドを連設してなり、これらの孔型ロールスタンドで形成され たロール孔型配列内にマンドレルバ一を配し、ホロ一シェルを連続的に延伸圧延す るマンドレルミルであって、少なくとも第 1スタンドおよび第 2スタンドのロール孔型を、 下記の (1)式〜 (4)式で示される条件を満たすように配置することを特徴とするマンドレ ルミル。  [1] A mandrel in which a plurality of perforated roll stands are continuously arranged, a mandrel bar is arranged in a roll perforated array formed by these perforated roll stands, and the holo-shell is continuously stretched and rolled. A mandrel mill characterized in that at least the roll holes of the first stand and the second stand are arranged so as to satisfy the conditions expressed by the following formulas (1) to (4).
b≤10a+l.5 …ひ）  b≤10a + l.5… hi)
b≥10a-0.2 ·'·(2)  b≥10a-0.2 (2)
b≤-a+l.5 ·'·(3)  b≤-a + l.5 (3)
b≥-a+l.15 ·'·(4)  b≥-a + l.15 '(4)
但し、式中の aは、孔型ロールの溝底曲率半径 R1とこの溝底曲率中心とミルセンタ 一との変位オフセット量 Sとの比 S/R1であり、 bは楕円度である。  Where a is the ratio S / R1 of the groove bottom radius of curvature R1 of the perforated roll and the displacement offset amount S between the center of groove bottom curvature and the mill center, and b is the ellipticity.
[2] 複数の孔型ロールスタンドを連設してなり、これらの孔型ロールスタンドで形成され たロール孔型配列内にマンドレルバ一を配したマンドレルミルの操業方法であって、 少なくとも第 1スタンドおよび第 2スタンドにおける孔型ロールの溝底曲率半径 Rl、変 位オフセット量 Sおよび楕円度が下記の (1)式〜 (4)式を満たす条件でホロ一シェルを 連続的に延伸圧延することにより穴明き欠陥および疵の発生を防止することを特徴と するマンドレルミルの操業方法。 [2] A mandrel mill operating method comprising a plurality of perforated roll stands arranged in series, and a mandrel bar arranged in a roll perforated array formed by these perforated roll stands, comprising at least a first stand In addition, the holo shell is continuously stretch-rolled under the conditions that the groove bottom radius of curvature Rl, displacement offset amount S and ellipticity of the second stand satisfy the following formulas (1) to (4): A mandrel mill operation method characterized by preventing the occurrence of drilling defects and flaws.
b≤10a+l.5 …ひ）  b≤10a + l.5… hi)
b≥10a-0.2 ·'·(2)  b≥10a-0.2 (2)
b≤-a+l.5 ·'·(3)  b≤-a + l.5 (3)
b≥-a+l.15 ·'·(4)  b≥-a + l.15 '(4)
但し、式中の aは、孔型ロールの溝底曲率半径 R1とこの溝底曲率中心とミルセンタ 一との変位オフセット量 Sとの比 S/R1であり、 bは楕円度である。  Where a is the ratio S / R1 of the groove bottom radius of curvature R1 of the perforated roll and the displacement offset amount S between the center of groove bottom curvature and the mill center, and b is the ellipticity.
[3] 複数の孔型ロールスタンドを連設してなり、これらの孔型ロールスタンドで形成され たロール孔型配列内にマンドレルバ一を配したマンドレルミルを用いて継目無管を製 造する方法であって、少なくとも第 1スタンドおよび第 2スタンドにおける孔型ロールの 溝底曲率半径 Rl、変位オフセット量 Sおよび楕円度が下記の (1)式〜 (4)式を満たす 条件でホロ一シェルを連続的に延伸圧延することを特徴とする継目無管の製造方法[3] A method of manufacturing a seamless pipe by using a mandrel mill in which a plurality of perforated roll stands are arranged in series and a mandrel bar is arranged in a roll perforated array formed by these perforated roll stands. The groove bottom radius of curvature Rl, displacement offset amount S and ellipticity of the perforated roll in at least the first stand and the second stand satisfy the following formulas (1) to (4): A method for producing a seamless pipe, characterized in that a hollow shell is continuously stretched and rolled under conditions
〇 Yes
b≤10a+l. 5 …ひ）  b≤10a + l. 5… hi)
b≥10a-0. 2 ·'·(2)  b≥10a-0. 2
b≤-a+l. 5 ·'·(3)  b≤-a + l. 5
b≥-a+l. 15 ·'·(4)  b≥-a + l. 15
但し、式中の aは、孔型ロールの溝底曲率半径 R1とこの溝底曲率中心とミルセンタ 一との変位オフセット量 Sとの比 S/R1であり、 bは楕円度である。  Where a is the ratio S / R1 of the groove bottom radius of curvature R1 of the perforated roll and the displacement offset amount S between the center of groove bottom curvature and the mill center, and b is the ellipticity.
PCT/JP2007/070732 2006-11-09 2007-10-24 Mandrel mill, its operating method, and seamless pipe manufacturing method WO2008056540A1 (en)

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EP07830466A EP2085158A4 (en) 2006-11-09 2007-10-24 Mandrel mill, its operating method, and seamless pipe manufacturing method
US12/312,423 US20100064753A1 (en) 2006-11-09 2007-10-24 Mandrel mill, operating method of the same and production method of seamless pipe
BRPI0718203A BRPI0718203A2 (en) 2006-11-09 2007-10-24 mandrel cutter, method of operation of this and seamless tube production method.
US12/563,229 US20100132425A1 (en) 2006-11-09 2009-09-21 Mandrel mill, operating method of the same and production method of seamless pipe

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Families Citing this family (10)

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DE102006031564A1 (en) * 2006-07-07 2008-01-10 Gesenkschmiede Schneider Gmbh Method for producing a rotationally symmetrical part, in particular shaft
MX2012003886A (en) * 2009-09-29 2012-04-20 Sumitomo Metal Ind Multi-roll mandrel mill and method for manufacturing seamless pipe.
WO2011088069A1 (en) * 2010-01-12 2011-07-21 Wadsworth Lewis W Apparatus and method for cutting tubular members
JP4883431B1 (en) * 2010-07-07 2012-02-22 住友金属工業株式会社 Mandrel mill and seamless pipe manufacturing method
CN102371362B (en) * 2010-08-25 2013-08-28 中国有色（沈阳）冶金机械有限公司 Static and dynamic balance processing method for heavy-duty hollow roller way
DE102010052084B3 (en) * 2010-11-16 2012-02-16 V&M Deutschland Gmbh Process for the economic production of seamless hot-rolled tubes in continuous tube rolling mills
CN104785525B (en) * 2015-04-07 2017-03-01 浙江嘉翔精密机械技术有限公司 A kind of method improving nuclear steam generator performance of heat exchange tubes
DE102018207908A1 (en) * 2018-05-18 2019-11-21 Sms Group Gmbh Stretch reduction mill with improved diameter and wall thickness tolerance
CN109909297B (en) * 2019-02-28 2020-06-02 西安建筑科技大学 Reverse-cone spiral roller superfine crystal rolling method for large-size high-temperature alloy bar
KR102322805B1 (en) * 2020-01-23 2021-11-10 가천대학교 산학협력단 Method for manufacturing multi-layered nuclear fuel cladding

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07102369B2 (en) 1991-08-22 1995-11-08 川崎製鉄株式会社 Mandrel mill
JP2582705B2 (en) 1991-06-21 1997-02-19 川崎製鉄株式会社 Mandrel mill
JP2985719B2 (en) 1995-04-04 1999-12-06 住友金属工業株式会社 Mandrel mill
JP2001113306A (en) 1999-10-18 2001-04-24 Sumitomo Metal Ind Ltd Manufacturing method for high alloy seamless steel tube and rolling pass used therefor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2582705B2 (en) 1991-06-21 1997-02-19 川崎製鉄株式会社 Mandrel mill
JPH07102369B2 (en) 1991-08-22 1995-11-08 川崎製鉄株式会社 Mandrel mill
JP2985719B2 (en) 1995-04-04 1999-12-06 住友金属工業株式会社 Mandrel mill
JP2001113306A (en) 1999-10-18 2001-04-24 Sumitomo Metal Ind Ltd Manufacturing method for high alloy seamless steel tube and rolling pass used therefor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2085158A4 *

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