WO2005035154A1 - Procede de fabrication d'un tube sans soudure par laminage a trois rouleaux - Google Patents

Procede de fabrication d'un tube sans soudure par laminage a trois rouleaux Download PDF

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Publication number
WO2005035154A1
WO2005035154A1 PCT/JP2004/014830 JP2004014830W WO2005035154A1 WO 2005035154 A1 WO2005035154 A1 WO 2005035154A1 JP 2004014830 W JP2004014830 W JP 2004014830W WO 2005035154 A1 WO2005035154 A1 WO 2005035154A1
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WO
WIPO (PCT)
Prior art keywords
mandrel mill
mandrel
roll
pipe
rolling
Prior art date
Application number
PCT/JP2004/014830
Other languages
English (en)
Japanese (ja)
Inventor
Takamitsu Inage
Shigeru Kidani
Hirotsugu Nakaike
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 DE602004022574T priority Critical patent/DE602004022574D1/de
Priority to EP04792128A priority patent/EP1679136B1/fr
Publication of WO2005035154A1 publication Critical patent/WO2005035154A1/fr

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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
    • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
    • 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
    • B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like

Definitions

  • the present invention relates to a method for producing a seamless tube using a three-roll mandrel mill.
  • a round billet or square billet of a material is heated to 1200-1260 ° C in a rotary hearth heating furnace, and then rolled with a drilling machine using a plug.
  • the hollow shell is manufactured by piercing and rolling with a roll.
  • a mandrel bar is inserted into the inner surface of the hollow shell in a skewered shape, and the outer surface is constrained by a mandrel mill, usually composed of 5-8 stands, and stretched and rolled while being constrained by a grooved roll to obtain a predetermined thickness. Until the thickness is reduced.
  • the reduced thickness pipe material is formed and rolled to a predetermined outer diameter by a reduction mill to obtain a product.
  • a mandrel mill conventionally, a pair of grooved rolling rolls facing each stand is arranged, and the rolling direction of the rolling rolls is alternately shifted by 90 ° between adjacent stands.
  • a roll type mandrel mill is used!
  • a seizure flaw generated at a portion corresponding to the flange portion and an excessive amount of tube material are generated.
  • the rolls are usually designed so that the curvature at both ends of the die is large.
  • the area corresponding to the flange of the roll of the tube roll is not constrained by the roll nor the mandrel bar and only the tension in the longitudinal direction acts. Therefore, the deformation (extension) in the circumferential direction should be controlled.
  • a hole defect or the like is easily generated in a material having low hot deformability such as stainless steel.
  • the deformation phenomenon of the pipe material in the rolling rolls in the three-roll type mandrel mill is greatly different from that of the two-roll type mandrel mill, and is disclosed in JP-A-5-185112.
  • the hole-shaped perimeter of the first stand and the third stand is set. It is not sufficient to solve such problems that the pulling of the mandrel bar after the rolling is insufficient and that the mandrel bar on the inner surface of the tube material easily causes a bow I crack.
  • the present invention has been made to solve such a problem of the prior art, and it is intended that a bow I of a mandrel bar after rolling is poorly removed and a bow I flaw caused by a mandrel bar on the inner surface of a tube material. It is an object of the present invention to provide a seamless pipe manufacturing method using a three-roll type mandrel mill that can effectively suppress the generation and operate in practice.
  • the present invention to solve the above-mentioned problem is directed to a method of manufacturing a seamless pipe using a three-roll type mandrel mill, wherein, among the stands constituting the mandrel mill, a pipe material has a thick wall. In the last two stands, the ratio of the inner circumference of the pipe to the outer circumference of the mandrel bar is set in the range of 1.07-1.17. Is provided.
  • the ratio of the inner peripheral length of the pipe to the outer peripheral length of the mandrel bar is set in a range of 1.10-1.17.
  • the ratio of the outer diameter of the tube material on the exit side of the mandrel mill to the groove bottom diameter of the rolling roll in the last two stands is set to 0.25 or less.
  • the ratio of the outer diameter of the tube material on the mandrel mill exit side to the groove bottom diameter of the rolling roll in the last two stands is set to 0.20 or less.
  • the ratio of the bar clearance on the entry side of the mandrel mill to the inner diameter of the pipe material on the entry side of the mandrel mill is set to 0.04 to 0.12.
  • the ratio of the bar clearance on the mandrel mill entry side to the tube inner diameter on the mandrel mill entry side is set to 0.06-0.12.
  • a sizing stand is installed at a stage subsequent to the last two stands, and the working ratio at the groove bottom of the rolling roll in the sizing stand is 5% or more.
  • the ratio of the inner peripheral length of the pipe to the outer peripheral length of the mandrel bar is set to 1.0 in the last two stands that apply thick calorie to the pipe among the stands constituting the mandrel mill.
  • the value in the range of 7- 1.17 the difference in wall thickness (uneven thickness) in the circumferential direction of the tube after rolling is not excessively large, and the mandrel bar is not pulled out properly after rolling, and the mandrel bar on the inner surface of the tube is not damaged. This makes it possible to effectively suppress the occurrence of bow I scratches due to the first method, and provides a method of manufacturing a seamless pipe using a three-roll mandrel mill that can be actually operated.
  • Fig. 1 is a diagram showing the effect of the ratio of the inner peripheral length of the pipe to the outer peripheral length of the mandrel bar in the last two stands of the mandrel mill, and (a) shows the effect on the pull-out property of the mandrel bar. (B) shows the effect on the inner surface quality of the tube, and (c) shows the effect on the uneven wall thickness of the tube (difference in circumferential thickness of the tube after rolling).
  • FIGS. 2A and 2B are diagrams for explaining the inner circumferential length of a pipe material set in the seamless pipe manufacturing method according to the present invention.
  • FIG. 2A is a layout diagram of each rolling roll
  • FIG. 2B is a broken line in FIG. An enlarged view of the part surrounded by is shown.
  • FIG. 3 is a diagram for explaining the effect of the groove bottom diameter of the rolling roll set on the pipe material in the seamless pipe manufacturing method according to the present invention.
  • Fig. 4 shows the effect of the ratio between the outer diameter of the tube at the exit side of the mandrel mill and the groove bottom diameter of the rolling rolls in the last two stands.
  • A shows the effect on the pullability of the mandrel bar.
  • B shows the effect on the inner surface quality of the tube, and
  • C shows the effect on the wall thickness deviation of the tube.
  • Fig. 5 shows the effect of the ratio of the bar clearance on the mandrel mill entry side to the inner diameter of the tube material on the mandrel mill entry side, where (a) shows the effect on the pull-out property of the mandrel bar and (b) shows the effect on the tube material. (C) shows the effect on the inner surface quality of the pipe, and (c) the effect on the uneven wall thickness of the pipe.
  • Fig. 6 shows the effect of the degree of work at the bottom of the groove of the rolling roll in the sizing stand, (a) the effect on the pull-out property of the mandrel bar, and (b) the effect on the inner surface quality of the pipe. (C) shows the effect on uneven wall thickness of the pipe.
  • FIG. 7 is a view for explaining the degree of processing at the bottom of the groove of the rolling roll in the sizing stand set in the method for manufacturing a seamless pipe according to the present invention.
  • Fig. 1 shows the effect of the ratio of the inner circumference of the pipe to the outer circumference of the mandrel bar at the last two stands of the mandrel mill.
  • Fig. 1 (a) shows the effect on the pull-out property of the mandrel bar. ) Shows the effect on the inner surface quality of the tube, and (c) shows the effect on the uneven wall thickness of the tube (the difference in wall thickness in the circumferential direction of the tube after rolling).
  • Fig. 1 (a) The vertical axis in Fig. 1 (a) indicates that "2" is good for both carbon steel and 9% Cr steel ("good” means that all 10 can be extracted), and "1" is good for “1". It shows that only carbon steel is good, and "0" indicates that both carbon steel and 9% Cr steel are bad.
  • Fig. 1 (b) indicates that "3" indicates that there is no internal disease (scratch due to mandrel bar) on the tubing, and "2" indicates that the incidence rate is 10% or less. “1” indicates that the incidence is less than or equal to 20%, and “0” indicates that the incidence is greater than 20%.
  • the vertical axis of FIG. 1 (c) indicates that “2” indicates that the uneven thickness ratio of the pipe is less than 15%, and “1” indicates that the unevenness is 15% or more.
  • FIG. 2 is a view for explaining the inner circumferential length of a pipe material set in the method for manufacturing a seamless pipe according to the present invention.
  • FIG. 2 (a) shows an arrangement diagram of each rolling roll
  • FIG. () Shows an enlarged view of a portion surrounded by a broken line in (a).
  • the inner circumferential length of the tube material is 6 in the circumferential direction with respect to the center of the hole shape C, based on the hole shape profile from the groove bottom B to one end E of each roll roll.
  • the arc forming the profile of the pipe near the end E should be angled by 60 ° with the straight line BC.
  • the intersection of the extended arc and the straight line CC' can be set as a point E,.
  • Correcting the outer surface shape (curve BE ') with the groove bottom thickness t means moving each point constituting the curve BE' inward in the normal direction of each point by the thickness t. I do.
  • the groove bottom thickness t is a value determined by the rolling schedule
  • the mandrel bar outer circumference is a value that also calculates the outer diameter force of the mandrel bar determined by the rolling schedule.
  • the inventors of the present invention have made various studies to prevent the pull-out property from being lowered by extending the tube material as much as possible along the groove shape of the rolling roll, and as a result, the groove bottom diameter of the rolling roll, that is, By setting the length of the line segment BB 'connecting the groove bottom B and the opposite groove bottom B' shown in FIG. We paid attention to the fact that the contact length between the bottom and the pipe was long.
  • FIG. 3 is a diagram for explaining the effect of the groove bottom diameter of the rolling roll on the pipe material at this time.
  • the contact length between the groove bottom of the roll and the tube becomes longer.
  • the deformation resistance in the rolling direction is increased, and as a result, the deformation of the rolling roll toward the flange portion side is promoted, and the overhang along the hole shape of the rolling roll is promoted.
  • the present inventors have determined the ratio of the outer diameter of the tube material on the exit side of the mandrel mill to the groove bottom diameter of the rolling roll in the last two stands (hereinafter referred to as "finish diameter Z roll groove bottom diameter" as appropriate).
  • Rolling test was performed on 10 tubes each made of carbon steel and 9% Cr steel while changing
  • Figure 4 shows the effect of the ratio between the outer diameter of the tube at the exit side of the mandrel mill and the groove bottom diameter of the rolling rolls at the last two stands.
  • (A) shows the effect on the pull-out property of the mandrel bar
  • (b) shows the effect on the inner surface quality of the tube
  • (c) shows the effect on the uneven wall thickness of the tube.
  • the finishing diameter Z roll groove bottom diameter As shown in FIGS. 4 (a) and 4 (b), by setting the finishing diameter Z roll groove bottom diameter to 0.25 or less (more preferably 0.20 or less), the pull-out property of the bar and the pipe material It was found that relatively good results were obtained for the inner surface quality. However, if the finished diameter Z roll groove bottom diameter is less than 0.1, good results can be obtained for the bar pull-out property and the inner surface quality of the tube material, but they are too large to be practical. Therefore, the finished diameter Z-roll groove bottom diameter is preferably 0.1-0.25, more preferably 0.1-0.2.
  • the outside diameter of the pipe at the outlet side of the mandrel mill is a value determined by a rolling schedule.
  • the present inventors also adjusted the ratio of the bar clearance at the entry side of the mandrel mill to the inner diameter of the tube material at the entry side of the mandrel mill, so that the tube material could follow the hole shape of the rolling roll. It was thought that it was possible to prevent the pull-out property from being lowered by overhanging.
  • Fig. 5 shows the effect of the ratio of the bar clearance on the mandrel mill entry side to the inner diameter of the tube material on the mandrel mill entry side.
  • (C) shows the effect on the wall thickness deviation of the pipe material. ing.
  • the entry side bar clearance Z finish diameter As shown in Figs. 5 (a) and 5 (b), by setting the entry side bar clearance Z finish diameter to be 0.04 or more (more preferably, 0.06 or more), the bar can be pulled out easily. It was a component that relatively good results were obtained for both the inner surface quality of the tubing. However, if the entry side bar clearance Z finish diameter is larger than 0.12, the outer peripheral length of the tube material will be excessively large and rolling may not be possible due to excessive protrusion, so it is not practical. Absent.
  • the entry side bar clearance Z finish diameter is preferably set to 0.04 to 0.12, more preferably to 0.06 to 0.12.
  • the bar clearance is defined by (the inner diameter of the tube material on the entry side of the mandrel mill and the outer diameter of the mandrel bar) and is a value determined by a rolling schedule.
  • the present inventors set up a sizing stand after the last two stands for performing wall thickness processing on the pipe material, and perform processing beyond a specified amount on the groove bottom of the rolling roll in the sizing stand.
  • the tube material was deformed in the flange direction, and an effective clearance was generated, so that it was considered that the pull-out property could be further improved.
  • Fig. 6 shows the effect of the degree of work at the bottom of the groove of the rolling roll in the sizing stand, (a) the effect on the pull-out property of the mandrel bar, and (b) the effect on the inner surface quality of the pipe. (C) shows the effect on uneven wall thickness of the pipe.
  • FIG. 7 is a schematic view of a method for manufacturing a seamless pipe according to the present invention.
  • FIG. 4 is a diagram for explaining the degree of processing at the groove bottom of the rolling roll in FIG.
  • the above-mentioned strength is determined by the long diameter (line CE of Fig. 2 (b)) at the final stand (the N-1st stand) where the wall thickness is applied to the pipe. Is equivalent to A, and the minor axis at the sizing stand (Nth stand)
  • Table 1 shows the conditions and the evaluation results of the examples of the seamless pipe manufacturing method according to the present invention.
  • Example 1 a rolling test was performed on each of 10 tubes each made of carbon steel and 9% Cr steel.
  • the rolling test is Examples 11 and 11 and Comparative Examples 1 and 2 were carried out using a mandrel mill with a total of 5 stand strengths (the 4th and 5th stands correspond to the last 2 stands for thickening the pipe).
  • Examples 12-16 each was performed using a mandrel mill in which a sizing stand (sixth stand) was installed after the last two stands.
  • ⁇ outside tZD '' shown in Table 1 indicates the wall thickness Z outer diameter of the tube at the mandrel mill outlet side
  • ⁇ final wall thickness 2Std circumference ratio '' indicates the wall thickness of the tube.
  • the ratio of the inner circumference of the tube to the outer circumference of the mandrel bar at the last two stands (the fourth and fifth stands) is defined as the “sizing Std groove bottom reduction” at the bottom of the rolling roll groove at the sizing stand (the sixth stand). Means the degree of processing.
  • the wall thickness deviation of the pipe material was all "1", and it was confirmed that the problem of wall thickness deviation did not occur.
  • the ratio of the inner peripheral length of the pipe to the outer peripheral length of the mandrel bar is set to 1.10-1.17 (Examples 2, 3, 6, 7, 10, 11, 15, 16)
  • the pull-out property is low. All were "2", indicating a remarkable effect.
  • Example 4 and Example 5 are compared or Example 6 and Example 7 are compared, even if the circumference ratio is the same, the outer diameter of the pipe material on the mandrel mill exit side and the final By making the ratio of the rolling roll to the groove bottom diameter of the two stands 0.2, the pulling power and the Z or inner surface quality of the tube material were improved.
  • Example 8 and Example 9 are compared, or Example 10 and Example 11 are compared, the rolling ratio in the circumference ratio, the outer diameter of the tube material on the mandrel mill exit side, and the final two stands is obtained. Even if the ratio to the groove bottom diameter is the same, the bar clearance on the mandrel mill entry side and the mandrel mill By setting the ratio to the inner diameter of the pipe on the inlet side to be 0.06, the pulling power and the quality of the inner surface of the pipe or Z were improved.
  • the inner circumference of the pipe and the outer circumference of the mandrel bar are used in each of the last two stands of the mandrel mill.
  • the ratio is set to 1.07-1.17, the difference in wall thickness in the circumferential direction (uneven thickness) of the post-rolled tube material does not become too large. It is possible to effectively suppress the occurrence of bow I scratches due to the mandrel bar on the inner surface of the pipe, and it is possible to actually operate with a three-roll mandrel mill. This allows

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

Cette invention concerne un procédé de fabrication de tube sans soudure selon lequel le rapport entre la circonférence intérieure du matériau pour tube et la circonférence extérieure de la tige de mandrin est fixé à 1,07-1,17 dans les deux dernières étapes de fabrication, où a lieu une opération d'accroissement de l'épaisseur du tube. On élimine ainsi efficacement les risques d'extraction défectueuse de la barre de mandrin après laminage et de formation de rayures sur la surface intérieure du matériau pour tube, sans augmenter exagérément les écarts d'épaisseur de la paroi dans le sens de la circonférence du matériau pour tube après laminage, cependant qu'il est possible d'utiliser effectivement le laminoir en continu à trois rouleaux. Par voie de conséquence, ce procédé peut être largement utilisée pour la fabrication de tubes sans soudure au moyen d'un système Mannesmann de laminoir continu
PCT/JP2004/014830 2003-10-07 2004-10-07 Procede de fabrication d'un tube sans soudure par laminage a trois rouleaux WO2005035154A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE602004022574T DE602004022574D1 (de) 2003-10-07 2004-10-07 Verfahren zur herstellung eines nahtlosen rohrs durch ein rohrwalzwerk mit drei walzen
EP04792128A EP1679136B1 (fr) 2003-10-07 2004-10-07 Procede de fabrication d'un tube sans soudure par laminage a trois rouleaux

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003348689A JP4103082B2 (ja) 2003-10-07 2003-10-07 ３ロール式マンドレルミルによる継目無管の製造方法
JP2003-348689 2003-10-07

Publications (1)

Publication Number Publication Date
WO2005035154A1 true WO2005035154A1 (fr) 2005-04-21

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PCT/JP2004/014830 WO2005035154A1 (fr) 2003-10-07 2004-10-07 Procede de fabrication d'un tube sans soudure par laminage a trois rouleaux

Country Status (6)

Country Link
EP (1) EP1679136B1 (fr)
JP (1) JP4103082B2 (fr)
CN (1) CN100368102C (fr)
DE (1) DE602004022574D1 (fr)
RU (1) RU2309015C1 (fr)
WO (1) WO2005035154A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104128372A (zh) * 2014-07-16 2014-11-05 洛阳鼎锐材料科技有限公司 一种短流程带固定芯棒轧制小直径无缝钢管的工艺与设备
CN112496076A (zh) * 2020-10-30 2021-03-16 太原理工大学 一种内波纹金属复合管的轧制方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI0718208B1 (pt) 2006-10-16 2019-08-27 Nippon Steel & Sumitomo Metal Corp mandril laminador e processo de produção de um tubo sem costura
JP5062522B2 (ja) * 2007-05-31 2012-10-31 住友金属工業株式会社 マンドレルミル及び継目無管の製造方法
WO2011018956A1 (fr) 2009-08-11 2011-02-17 住友金属工業株式会社 Dispositif pour régler la position d’une vis de serrage d’un cylindre de laminoir faisant partie d’un laminoir continu à trois cylindres, et procédé de fabrication d’un tuyau sans soudure
CN105013822B (zh) * 2015-07-08 2017-03-08 烟台宝钢钢管有限责任公司 一种芯棒限动连轧机组轧制厚壁管的短流程方法
CN109622904B (zh) * 2019-02-01 2020-06-02 东北大学 一种实现连铸圆坯凝固过程芯部压下工艺的装置及方法

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JPS58125304A (ja) * 1982-01-19 1983-07-26 Kawasaki Steel Corp 継目無鋼管の延伸圧延機
JPH0747410A (ja) * 1993-08-09 1995-02-21 Ishikawajima Harima Heavy Ind Co Ltd 管の連続延伸圧延装置
JPH07214110A (ja) * 1994-02-08 1995-08-15 Sumitomo Metal Ind Ltd リトラクトマンドレルミルによる圧延方法
JPH08187502A (ja) * 1995-01-09 1996-07-23 Sumitomo Metal Ind Ltd 管の連続圧延方法および３ロールマンドレルミル

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US5218851A (en) * 1991-06-21 1993-06-15 Kawasaki Steel Corporation Mandrel mill capable of preventing stripping miss
JP2897652B2 (ja) * 1994-09-05 1999-05-31 住友金属工業株式会社 マンドレルミルおよびそれを用いた管圧延方法
CN2356765Y (zh) * 1998-12-30 2000-01-05 宝山钢铁(集团)公司 一种三辊减径机轧辊

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JPS58125304A (ja) * 1982-01-19 1983-07-26 Kawasaki Steel Corp 継目無鋼管の延伸圧延機
JPH0747410A (ja) * 1993-08-09 1995-02-21 Ishikawajima Harima Heavy Ind Co Ltd 管の連続延伸圧延装置
JPH07214110A (ja) * 1994-02-08 1995-08-15 Sumitomo Metal Ind Ltd リトラクトマンドレルミルによる圧延方法
JPH08187502A (ja) * 1995-01-09 1996-07-23 Sumitomo Metal Ind Ltd 管の連続圧延方法および３ロールマンドレルミル

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104128372A (zh) * 2014-07-16 2014-11-05 洛阳鼎锐材料科技有限公司 一种短流程带固定芯棒轧制小直径无缝钢管的工艺与设备
CN112496076A (zh) * 2020-10-30 2021-03-16 太原理工大学 一种内波纹金属复合管的轧制方法

Also Published As

Publication number Publication date
JP4103082B2 (ja) 2008-06-18
EP1679136A1 (fr) 2006-07-12
JP2005111518A (ja) 2005-04-28
RU2309015C1 (ru) 2007-10-27
EP1679136B1 (fr) 2009-08-12
DE602004022574D1 (de) 2009-09-24
CN1863608A (zh) 2006-11-15
EP1679136A4 (fr) 2007-08-15
CN100368102C (zh) 2008-02-13

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