WO2008056540A1 - Laminoir continu, son procédé de fonctionnement et procédé de fabrication de tuyau sans coutures - Google Patents

Laminoir continu, son procédé de fonctionnement et procédé de fabrication de tuyau sans coutures 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
Authority
WO
WIPO (PCT)
Prior art keywords
roll
stand
perforated
mandrel
curvature
Prior art date
Application number
PCT/JP2007/070732
Other languages
English (en)
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.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries, Ltd. filed Critical Sumitomo Metal Industries, Ltd.
Priority to US12/312,423 priority Critical patent/US20100064753A1/en
Priority to EP07830466A priority patent/EP2085158A4/fr
Priority to BRPI0718203A priority patent/BRPI0718203A2/pt
Publication of WO2008056540A1 publication Critical patent/WO2008056540A1/fr
Priority to US12/563,229 priority patent/US20100132425A1/en

Links

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

La présente invention concerne un laminoir continu permettant la fabrication d'un tuyau sans couture qui ne comprend aucun défaut, tel qu'un défaut d'étranglement. Le laminoir continu comprend une pluralité de cages de laminoir du type à orifices installées de manière consécutive et une barre porte-mandrin (3) est agencée dans le moule de forgeage formé de ces cages de laminoir du type à orifices, pour étirer et rouler de ce fait une coquille creuse (2) en continu. Un moule de laminoir (4) pour au moins une première cage et une seconde cage est agencé de façon à remplir les conditions requises par les formules (1) à (4) suivantes : b ≤ 10a + 1.5... (1); b ≥ 10a - 0.2... (2); b ≤ -a + 1.5... (3); and b ≥ -a + 1.15... (4), où a = S/R1, et b = C/(R1 - S).
PCT/JP2007/070732 2006-11-09 2007-10-24 Laminoir continu, son procédé de fonctionnement et procédé de fabrication de tuyau sans coutures WO2008056540A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US12/312,423 US20100064753A1 (en) 2006-11-09 2007-10-24 Mandrel mill, operating method of the same and production method of seamless pipe
EP07830466A EP2085158A4 (fr) 2006-11-09 2007-10-24 Laminoir continu, son procédé de fonctionnement et procédé de fabrication de tuyau sans coutures
BRPI0718203A BRPI0718203A2 (pt) 2006-11-09 2007-10-24 fresa para mandril, método de operação desta e método de produção de tubo sem costura.
US12/563,229 US20100132425A1 (en) 2006-11-09 2009-09-21 Mandrel mill, operating method of the same and production method of seamless pipe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-303776 2006-11-09
JP2006303776A JP2008119706A (ja) 2006-11-09 2006-11-09 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

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/563,229 Continuation US20100132425A1 (en) 2006-11-09 2009-09-21 Mandrel mill, operating method of the same and production method of seamless pipe

Publications (1)

Publication Number Publication Date
WO2008056540A1 true WO2008056540A1 (fr) 2008-05-15

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Application Number Title Priority Date Filing Date
PCT/JP2007/070732 WO2008056540A1 (fr) 2006-11-09 2007-10-24 Laminoir continu, son procédé de fonctionnement et procédé de fabrication de tuyau sans coutures

Country Status (6)

Country Link
US (2) US20100064753A1 (fr)
EP (1) EP2085158A4 (fr)
JP (1) JP2008119706A (fr)
CN (1) CN101534969A (fr)
BR (1) BRPI0718203A2 (fr)
WO (1) WO2008056540A1 (fr)

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DE102006031564A1 (de) * 2006-07-07 2008-01-10 Gesenkschmiede Schneider Gmbh Verfahren zur Herstellung eines rotationssymmetrischen Teils, insbesondere Welle
MX2012003886A (es) * 2009-09-29 2012-04-20 Sumitomo Metal Ind Laminador de mandril de rodillos multiples y metodo para producir tubos sin costuras.
US9016178B2 (en) * 2010-01-12 2015-04-28 Lewis W. Wadsworth Apparatus and method for cutting tubular members
CN103097045B (zh) * 2010-07-07 2015-01-28 新日铁住金株式会社 芯棒式无缝管轧机及无缝管的制造方法
CN102371362B (zh) * 2010-08-25 2013-08-28 中国有色（沈阳）冶金机械有限公司 一种重型空心辊道静动平衡的加工方法
DE102010052084B3 (de) * 2010-11-16 2012-02-16 V&M Deutschland Gmbh Verfahren zur wirtschaftlichen Herstellung von nahtlos warmgewalzten Rohren in Rohrkontiwalzwerken
CN104785525B (zh) * 2015-04-07 2017-03-01 浙江嘉翔精密机械技术有限公司 一种提高核电蒸汽发生器换热管性能的方法
DE102018207908A1 (de) * 2018-05-18 2019-11-21 Sms Group Gmbh Streckreduzierungswalzwerk mit verbesserter Durchmesser- und Wanddickentoleranz
CN109909297B (zh) * 2019-02-28 2020-06-02 西安建筑科技大学 一种大尺寸高温合金棒材的反锥螺线辊超细晶轧制方法
KR102322805B1 (ko) * 2020-01-23 2021-11-10 가천대학교 산학협력단 다층구조 핵연료 피복관 제조방법

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07102369B2 (ja) 1991-08-22 1995-11-08 川崎製鉄株式会社 マンドレルミル
JP2582705B2 (ja) 1991-06-21 1997-02-19 川崎製鉄株式会社 マンドレルミル
JP2985719B2 (ja) 1995-04-04 1999-12-06 住友金属工業株式会社 マンドレルミル
JP2001113306A (ja) 1999-10-18 2001-04-24 Sumitomo Metal Ind Ltd 高合金継目無鋼管の製造方法およびそれに用いる圧延用孔型

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2582705B2 (ja) 1991-06-21 1997-02-19 川崎製鉄株式会社 マンドレルミル
JPH07102369B2 (ja) 1991-08-22 1995-11-08 川崎製鉄株式会社 マンドレルミル
JP2985719B2 (ja) 1995-04-04 1999-12-06 住友金属工業株式会社 マンドレルミル
JP2001113306A (ja) 1999-10-18 2001-04-24 Sumitomo Metal Ind Ltd 高合金継目無鋼管の製造方法およびそれに用いる圧延用孔型

Non-Patent Citations (1)

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Title
See also references of EP2085158A4 *

Also Published As

Publication number Publication date
US20100064753A1 (en) 2010-03-18
EP2085158A4 (fr) 2012-08-01
JP2008119706A (ja) 2008-05-29
US20100132425A1 (en) 2010-06-03
CN101534969A (zh) 2009-09-16
EP2085158A1 (fr) 2009-08-05
BRPI0718203A2 (pt) 2015-09-22

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