EP0623403A1 - Procede de formage de tubes soudes et support de formage prevu a cet effet - Google Patents

Procede de formage de tubes soudes et support de formage prevu a cet effet Download PDF

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Publication number
EP0623403A1
EP0623403A1 EP93919622A EP93919622A EP0623403A1 EP 0623403 A1 EP0623403 A1 EP 0623403A1 EP 93919622 A EP93919622 A EP 93919622A EP 93919622 A EP93919622 A EP 93919622A EP 0623403 A1 EP0623403 A1 EP 0623403A1
Authority
EP
European Patent Office
Prior art keywords
roll
metallic strip
forming
rolls
horizontal
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP93919622A
Other languages
German (de)
English (en)
Other versions
EP0623403B1 (fr
EP0623403A4 (fr
Inventor
Kenji Hada
Yasuo Kimiya
Daigo Sumimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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
Priority claimed from JP5014283A external-priority patent/JPH05317979A/ja
Priority claimed from JP1428293A external-priority patent/JPH05309422A/ja
Priority claimed from JP1428493A external-priority patent/JP2642575B2/ja
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of EP0623403A1 publication Critical patent/EP0623403A1/fr
Publication of EP0623403A4 publication Critical patent/EP0623403A4/fr
Application granted granted Critical
Publication of EP0623403B1 publication Critical patent/EP0623403B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • B21D5/10—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes
    • B21D5/12—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes making use of forming-rollers

Definitions

  • the present invention relates to a forming method and forming stand for forming welded pipes to accurate dimensions in a welded pipe manufacturing line on which a metallic strip of a predetermined width is continuously formed by rolls and welded by the electric resistance welding method or other welding methods.
  • a metallic strip of a predetermined width is continuously supplied to a group of forming rolls including a plurality of breakdown rolls, side rolls and fin-pass rolls, and then the formed metallic strip is subjected to welding such as high frequency welding in which squeeze rolls are used.
  • this method welded pipes are continuously manufactured. Therefore, this method is greatly advantageous in that the manufacturing efficiency is improved and the cost is reduced. Accordingly, this method is widely used when mechanical structure pipes, boiler pipes, oil well pipes and other various pipes are manufactured. Recently, there is a demand for applying this method to the manufacture of thin wall pipes, thick wall pipes and high tensile strength pipes. Further, there is a strong demand for manufacturing pipes of high quality and high accuracy.
  • two rolls are constituted for the horizontal lower caliber roll applied to the edge forming roll stand, and the inclination angles of the two rolls are capable of being adjusted with respect to the metallic strip advancing direction, so that the edge portions of both thick and thin wall metallic strips are sufficiently bent.
  • the problem of defective profile is caused especially when thin wall pipes, thick wall pipes and high tensile strength pipes are formed.
  • the thickness of the edge portion is increased as shown by numeral 1 in Fig. 1. This increase of thickness 1 is a factor to deteriorate the size accuracy.
  • edge forming rolls disclosed in Japanese unexamined Patent Publication (Kokai) No. 62-166027 can be applied to a wide range of pipe diameters, however, since the radius of curvature of the roll is continuously changed, the roll locally comes into contact with a metallic strip, so that the problem of defective profile tends to occur, and this method is not appropriate for forming thick wall pipes.
  • the present invention has been achieved to solve the above problems in the prior art. It is an object of the present invention to provide a forming method and forming stand applied to a welded pipe manufacturing line by which welded pipes of high size accuracy can be formed and especially edge portions of a metallic strip can be accurately bent.
  • Fig. 1 is a sectional view of a metallic strip, the edge thickness of which is increased, which deteriorates the size accuracy.
  • Fig. 2 is a sectional view of a metallic strip on which a bend indentation is caused, which deteriorates the size accuracy.
  • Fig. 3 is a view showing the progress of forming of a metallic strip right below the forming roll.
  • Figs. 4(a), 4(b), 4(c) and 4(d) are views showing the example of the present invention of a gap formed between the upper and lower rolls in accordance with the forming radius of curvature and the thickness, wherein Fig. 4(a) shows a case of a thin wall, Fig. 4(b) shows a case of a small radius of curvature (large diameter), Fig. 4(c) shows a case of a thick wall, and Fig. 4(d) shows a case of large radius of curvature (small diameter).
  • Figs. 5(a) and 5(b) are schematic illustrations showing the direction of a roll, wherein Fig. 5(a) shows a case of the forming roll of the invention directed inside, and Fig. 5(b) shows a case of the forming roll of the invention directed outside.
  • Fig. 6 is a schematic illustration showing the direction of a thrust in the case of the forming roll of the invention directed inside.
  • Fig. 7 is a schematic illustration showing a case in which the upper roll deviates in the case of a forming roll of the invention directed outside.
  • Figs. 8(a) and 8(b) are plan views showing an example of the roll to which the present invention is applied, wherein Fig. 8(a) is a front view and Fig. 8(b) is a plan view.
  • Fig. 9 is a view showing an example of the forming apparatus to which the present invention is applied.
  • Figs. 10(a) and 10(b) are views showing the examples of the distributions in the radius of curvature and wall thicknesses after a metallic strip has passed through a single stand in the case where the present invention is applied and in the case where the present invention is not applied.
  • Fig. 11 is a view showing an example of the distributions in the radius of curvature and wall thicknesses expressing the properties of sharing a roll in the case where the present invention is applied.
  • Figs. 12(a) and 12(b) are views showing an example of the roll to which the present invention is applied, wherein Fig. 12(a) is a front view and Fig. 12(b) is a plan view.
  • Fig. 13 is a view showing an example of the forming apparatus to which the present invention is applied.
  • metallic strips can be accurately formed into pipes with thin or thick walls with two pairs of upper and lower horizontal edge forming rolls disposed on both sides of the metallic strip in a breakdown stand for the purpose of edge forming, the two pairs of rolls being provided when a pair of upper and lower rolls are divided into two with respect to the width direction of the metallic strip, wherein the edge forming is performed under the condition that the pair of upper and lower horizontal rolls are crossed by being turned on a vertical axis.
  • a pair of upper and lower horizontal edge forming rolls 3, 4 are crossed, and the upper and lower rolls are continuously contacted with both sides of a metallic strip 5 to be formed right below the upper forming roll.
  • Fig. 4(a) shows a case of a small wall thickness
  • Fig. 4(b) shows a case of a small radius of curvature (large pipe diameter)
  • Fig. 4(c) shows a case of large wall thickness.
  • the turning angle of the upper roll is determined by the profile of the upper roll caliber, the outside diameter of the pipe to be formed from the metallic strip, the wall thickness of the metallic strip, and the upper roll diameter.
  • the turning angle of the lower roll is determined by the profile of the lower roll caliber, the outside diameter of the pipe to be formed from the metallic strip, and the lower roll diameter.
  • the upper limit of the turning angle is determined to be 45°.
  • the sharable range of metallic straps to be formed is extended.
  • the same problems as those described above are caused, and further the sharable range of metallic strips is limited due to the interference of the upper and lower rolls disposed on both sides. Accordingly, consideration is given to the sharable range of the metallic strips to be formed, and the upper limit of the turning angle is determined to be 30°. Due to the foregoing, the sharable range of the diameter of the pipe to be formed from the metallic strip can be extended by 1.5 to 2.0 times.
  • each pair of upper and lower rolls are disposed at different positions with respect to the metallic strip forming direction. Therefore, after the forming of one edge of the metallic strip has been started, the forming of the other edge is started. Due to the foregoing, in the case where small size pipes are formed, interference of the forming rolls on both sides caused when the upper and lower rolls are turned can be avoided, so that the turning angles of the forming rolls are not restricted. In this case, an interval with respect to the metallic strip forming direction between the pairs of upper and lower rolls disposed on both sides, is determined by the diameters of the upper and lower rolls and the range of the designed turning angle.
  • the horizontal upper rolls divided with respect to the metallic strip width direction are disposed on both sides for the purpose of edge forming. Then horizontal upper rolls are turned on and fixed at a vertical axis.
  • pipes of various wall thickness that is, pipes of thin and thick walls can be formed with high accuracy.
  • the reason why the pipes of various wall thickness can be accurately formed in the above manner will be described as follows: As illustrated in Fig. 3, when the upper horizontal forming roll is turned on a vertical axis, the upper roll 3 continuously comes into contact with the edge of the metallic strip to be formed right below the roll on both sides, so that both edge portions of the metallic strip are subjected to forming.
  • the turning angle of the upper roll is determined by the profile of the upper roll caliber, the outside diameter of the pipe to be formed from the metallic strip, the wall thickness of the metallic strip, and the upper roll diameter.
  • the turning angle direction of the upper roll is limited as follows.
  • the upper limit of the turning angle is determined to be 45°.
  • the roll direction will be explained as follows.
  • the upper and lower rolls are divided into two, a slippage is caused between the rolls and the metallic strip when the upper and lower rolls are turned. Therefore, a force is applied to the rolls in the width direction of the metallic strip, and torsion is generated in the rolls.
  • the upper rolls are positioned in such a manner that the rolls are directed to the edges of the metallic strip on the entry side of the roll stand and also the rolls are directed to the center of the metallic strip on the delivery side of the roll stand.
  • the lower rolls are positioned in the opposite direction to that of the upper roll. In the manner described above, the upper and lower rolls are crossed with each other.
  • the above roll arrangement will be referred to as "a forming roll arrangement directed inside", hereinafter.
  • the upper roll is given a thrust directed inside
  • the lower roll is given a thrust directed outside.
  • a deviation directed outside with respect to the width direction is caused in the upper roll
  • a deviation directed inside with respect to the width direction is caused in the lower roll.
  • the upper rolls are positioned in such a manner that the rolls are directed to the center of the metallic strip on the entry side of the roll stand and also the rolls are directed to the edge of the metallic strip on the delivery side of the roll stand.
  • the lower rolls are positioned in the opposite direction to that of the upper roll.
  • the upper and lower rolls are crossed with each other.
  • the above roll arrangement will be referred to as "a forming roll arrangement directed outside", hereinafter. As illustrated in Fig. 7, a deviation directed inside with respect to the width direction is caused in the upper roll, and a deviation directed outside with respect to the width direction is caused in the lower roll.
  • the forming roll arrangement directed outside the following problems are caused: Since the upper roll is not contacted with an extreme edge portion, the edge portion is not sufficiently bent. In the case where the present invention is applied to the W-bend method, the gap becomes narrow due to the deviation, and the wall thickness is locally reduced.
  • the forming roll arrangement directed inside the above problems are not caused, and further the torsion forces applied to the upper and lower rolls are advantageous for edge forming, and the reduction force of the upper and lower rolls are advantageously reduced. Accordingly, in the case of a roll stand in which torsion tends to occur due to insufficient rigidity, it is preferable to employ "the forming roll arrangement directed inside".
  • Fig. 8(a) is a front view of the rolls to which the present invention is applied
  • Fig. 8(b) is a plan view.
  • the turning angle ⁇ d of the lower roll 4 is determined in accordance with the forming radius of curvature of the edge portion 13 of the metallic strip 5.
  • the positions of upper and lower rolls on both sides are determined with respect to the width direction.
  • the turning angle ⁇ u of the upper roll 3 is determined.
  • Fig. 9 is a front view of an example of the edge bending roll stand to which the present invention is applied.
  • the roll support beam members 14, 15 vertically hold the upper and lower roll bearing members 17, 18, and the upper roll support beam member 14 is vertically moved and fixed by the action of the reduction screw shaft 16.
  • the upper and lower roll support stands 19, 20 are moved and fixed in the width direction by the rotation of a screw shaft not shown in the drawing or by the sliding motion of a sliding bracket on a rail not shown in the drawing, wherein the screw shaft or the sliding bracket is disposed in the beam members 14, 15. Further, the upper and lower roll support stands 19, 20 are turned and fixed on a vertical shaft by means of a gear drive unit not shown in the drawing.
  • bearing members for supporting the middle portions of the upper and lower rolls, or a bearing member for supporting one of them may be fixed to the roll support beam members 14, 15.
  • two pairs of upper and lower horizontal rolls are disposed on both sides of the same stands.
  • two pairs of upper and lower rolls are disposed at different positions, and after one pair of rolls have completed edge forming of the edge on one side, the other pair of roll start edge forming of the edge on the other side.
  • the two pairs of forming rolls may be disposed in different roll stands. Further, it is possible to provide a guide roll at the side where edge forming is not conducted.
  • Figs. 10a and 10b shows the distributions of radius of curvature and wall thickness after a steel strip of ⁇ 50.8 ⁇ t2.10 mm, the yield strength of which was 294 N/mm2, was subjected to edge forming, wherein one is a case to which the present invention was applied and the other is a case to which the present invention was not applied.
  • the forming roll arrangement directed inside was applied. According to the conventional method, steel strips of small wall thickness were not sufficiently bent, and indentations were caused on steel strips of large wall thickness. However, in the case where the present invention was applied, excellent profiles were provided.
  • Fig. 11 shows the distributions of radius of curvature and wall thickness after a steel strip of ⁇ 34.0 ⁇ t5 mm was subjected to edge forming, wherein the same forming rolls as those described above were used and the turning angle was adjusted.
  • the obtained radius of curvature was approximately the same as the radius of curvature which was previously set, and further the provided profile was good. It can be seen that the outer diameter of the forming roll can be shared when the present invention is applied.
  • Table 1 shows the results on the radius of curvature and the reduced wall thickness in the case where edge forming was conducted using the same rolls, wherein the turning angles of the upper and lower rolls were changed with respect to various forming diameter and wall thickness. It can be seen that the edge forming properties were improved, the reduction of wall thickness was decreased, and the roll outer diameter was shared, when the present invention was applied. Further, when the turning angle setting conditions described in the second and third embodiments of the present invention were applied, the effects of the present invention were exhibited to the maximum.
  • Fig. 12(a) is a front view
  • Fig. 12(b) is a plan view, of the rolls to which the present invention is applied.
  • the dimensions of the lower roll 4 are determined in accordance with the width of the metallic strip 5 and the length of a portion of the metallic strip 5 to be bent, and the positions of upper and lower roll on both sides with respect to the width direction are also determined in accordance with the width of the metallic strip 5 and the length of a portion of the metallic strip 5 to be bent. Further, in accordance with the wall thickness of the metallic strip 5, the turning angle ⁇ u of the upper roll 3 is determined, and numeral 7 is a central portion of the metallic strip.
  • the hysteresis of the upper roll gap right below the upper roll 3 is shown in Fig. 4, and the hysteresis of the lower roll is the same as that of the conventional case.
  • Circumstances of the metallic strip deformed in accordance with the roll gap hysteresis are shown in Fig. 3, in which numeral 3 is an upper roll, numeral 4 is a lower roll, and numeral 5 is a metallic strip.
  • Fig. 13 is a front view of the exemplary edge bend roll stand to which the present invention is applied.
  • the roll support beam member 14 vertically holds the upper roll bearing member 17, and the upper roll support beam member 14 is vertically moved and fixed by the action of the reduction screw shaft 16.
  • the upper roll support stand 19 is moved and fixed in the width direction by the rotation of a screw shaft not shown in the drawing or by the sliding motion of a sliding bracket on a rail not shown in the drawing, wherein the screw shaft or the sliding bracket is disposed in the beam member 14. Further, the upper roll support stand 19 is turned and fixed on a vertical shaft by means of a gear drive unit not shown in the drawing.
  • the lower rolls 4 can be rotated by the lower roll shaft 20 through the lower roll bearing members 18. Further, the positions of the lower rolls 4 can be changed and fixed in the width direction by means of a screw means or hydraulic means not shown in the drawing.
  • a bearing member for supporting the middle portion of the upper roll may be fixed to the roll support beam member 14.
  • Table 2 shows the results of radius of curvature and reduced wall thickness in the case where edge forming was conducted using the same rolls, wherein the turning angles of the upper roll was changed with respect to various wall thickness. It can be seen that the edge forming properties were improved and the reduction of wall thickness was decreased when the present invention was applied. Further, when the turning angle setting conditions described in the fifth and sixth embodiments of the present invention were applied, the effects of the present invention were exhibited at the maximum.
  • the metallic strip when a metallic strip is continuously formed by rolls and then welded so as to manufacture a welded pipe, the metallic strip is subjected to edge forming by the breakdown roll unit provided in the initial edge forming process without the deterioration of accuracy of the wall thickness of the metallic strip to be formed. Further, the forming roll can be shared when metallic strips for various pipe diameters are formed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

L'invention concerne un procédé de formage de tubes soudés avec une précision dimensionnelle élevée sur une ligne de production. Ledit procédé consiste à former par laminage en continu un feuillard métallique d'une largeur prédéterminée et à le souder, et plus particulièrement à rouler les extrémités dudit feuillard avec une grande précision, ainsi qu'un support de formage prévu à cet effet. Une paire de ou un rouleaux de formage horizontaux chacun étant divisé en deux segments dans le sens de largeur du feuillard peuvent être prévus dans le sens de la largeur. De plus, chaque segment supérieur de rouleau fendu est conçu pour être fixé sur un axe en position verticale et tourner autour de celui-ci, le sens et l'angle de rotation étant réduits afin de maximiser l'efficacité du procédé selon l'invention. Ce système permet de procéder au roulage sans perdre de précision dans l'épaisseur des parois du matériau à former et de produire des tubes de différents diamètres à partir de feuillards métalliques à l'aide de rouleaux.
EP93919622A 1992-09-25 1993-09-07 Procede de formage de tubes soudes et support de formage prevu a cet effet Expired - Lifetime EP0623403B1 (fr)

Applications Claiming Priority (13)

Application Number Priority Date Filing Date Title
JP25670892 1992-09-25
JP25670892 1992-09-25
JP256708/92 1992-09-25
JP5014283A JPH05317979A (ja) 1992-03-25 1993-01-29 溶接管の成形方法および成形スタンド
JP1428293A JPH05309422A (ja) 1992-03-13 1993-01-29 溶接管の成形方法および成形スタンド
JP14284/93 1993-01-29
JP1428393 1993-01-29
JP1428293 1993-01-29
JP14283/93 1993-01-29
JP1428493 1993-01-29
JP1428493A JP2642575B2 (ja) 1992-09-25 1993-01-29 溶接管の成形方法および成形スタンド
JP14282/93 1993-01-29
PCT/JP1993/001265 WO1994007621A1 (fr) 1992-09-25 1993-09-07 Procede de formage de tubes soudes et support de formage prevu a cet effet

Publications (3)

Publication Number Publication Date
EP0623403A1 true EP0623403A1 (fr) 1994-11-09
EP0623403A4 EP0623403A4 (fr) 1995-11-29
EP0623403B1 EP0623403B1 (fr) 1999-11-17

Family

ID=27456166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93919622A Expired - Lifetime EP0623403B1 (fr) 1992-09-25 1993-09-07 Procede de formage de tubes soudes et support de formage prevu a cet effet

Country Status (3)

Country Link
EP (1) EP0623403B1 (fr)
DE (1) DE69327045T2 (fr)
WO (1) WO1994007621A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104889208A (zh) * 2015-05-28 2015-09-09 南京皓威机械有限公司 多自由度三辊制管机

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4935500B1 (fr) * 1970-12-05 1974-09-24
JP2692176B2 (ja) * 1988-10-07 1997-12-17 住友金属工業株式会社 溶接管の製造装置
JPH0698402B2 (ja) * 1990-11-14 1994-12-07 川崎製鉄株式会社 溶接鋼管の帯板縁部成形ロール

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO9407621A1 *

Also Published As

Publication number Publication date
DE69327045D1 (de) 1999-12-23
EP0623403B1 (fr) 1999-11-17
DE69327045T2 (de) 2000-06-29
WO1994007621A1 (fr) 1994-04-14
EP0623403A4 (fr) 1995-11-29

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