EP0566223B1 - Procédé pour la fabrication de tubes sans soudure par le procédé de laminage à mandrin - Google Patents

Procédé pour la fabrication de tubes sans soudure par le procédé de laminage à mandrin Download PDF

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Publication number
EP0566223B1
EP0566223B1 EP93250081A EP93250081A EP0566223B1 EP 0566223 B1 EP0566223 B1 EP 0566223B1 EP 93250081 A EP93250081 A EP 93250081A EP 93250081 A EP93250081 A EP 93250081A EP 0566223 B1 EP0566223 B1 EP 0566223B1
Authority
EP
European Patent Office
Prior art keywords
plug
rolling
wall thickness
pass
roll
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.)
Expired - Lifetime
Application number
EP93250081A
Other languages
German (de)
English (en)
Other versions
EP0566223A1 (fr
Inventor
Karl Heinz Häusler
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0566223A1 publication Critical patent/EP0566223A1/fr
Application granted granted Critical
Publication of EP0566223B1 publication Critical patent/EP0566223B1/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
    • 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
    • B21B17/08—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 having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills
    • B21B17/12—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 having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills in a discontinuous process, e.g. plug-rolling mills

Definitions

  • the invention relates to a method for producing seamless tubes according to the plug rolling process in which a hollow block is expanded and stretched into a billet in at least two passes into a billet in a roll stand with a closed caliber in at least two passes, the billet after each pass pulled off the rod against the rolling direction by means of a driving device and rotated by 90 degrees about its longitudinal axis before the next stitch (see, for example, DE-A-3936326).
  • Known rolling processes for the production of seamless steel pipes differ in longitudinal and cross rolling processes.
  • longitudinal rolling process in contrast to the cross rolling process, an essentially round and closed caliber shape is required, which must be adapted to the desired pipe cross section.
  • the present invention relates to a longitudinal rolling process with an internal tool, as is known under the name plug rolling process.
  • Boot rolling mills originally consisted of a perforated cross-rolling mill, a stretch diagonal rolling mill, Stiefelscher plug rolling mill, and at least one smoothing mill in front of a downstream reduction mill as a finishing stage. Because there was a high temperature loss on the tube after the many process steps from the piercing to the reducing roller mill, the tubes were generally reheated to the reducing roller temperature in a specially designed oven after the smooth rolling.
  • the original boot plug mill had rolls with several calibers cut next to each other. Later, single-caliber plug rolling mills were developed because the multi-caliber rolls caused inaccuracies in the rolled product due to the deflections.
  • a hollow block is rolled out into a slug via a fixed plug supported on a rod, preferably in two to three passes. After each stitch, the billet is pulled off the rod against the direction of rolling by a driving device and rotated through 90 degrees to the next stitch. The plugs are changed after each stitch.
  • Today plugs with a short working length are usually used, the diameter of which is larger than the inside diameter of the hollow block used.
  • a method of operation is also known in which the hollow block is larger in inner diameter than the first plug diameter.
  • the hollow blocks are expanded over the stopper, which results in more favorable gripping conditions for the rollers.
  • the plugs with a short working length are economical and, thanks to the favorable gripping conditions, higher ones Achieve decreases in wall thickness.
  • the plug diameter of the second stitch is usually slightly larger than that of the first stitch, while the third plug can be the same size or larger than the second.
  • the blanks lose considerable temperature due to the low rolling speeds and during the long rolling process, they are usually reheated before rolling out in dimension, reducing or stretch-reducing rolling mills, so that the stopper rolling mill compared to others Rolling mills is very complex and uneconomical.
  • the present invention achieves this aim by a method which, based on the prior art according to the preamble of claim 1, is characterized in that, in the case of a plurality of successive stitches, at least one, preferably in the first, stitch in the region of the caliber base by changing the pitch of the rollers a Wall thickness is set, which takes into account the thin drawing of this wall area in the subsequent roll pass in the sense of a wall thickness of the finished rolled stopper that is uniform over the circumference.
  • the proposal of the invention is based on the knowledge that the hollow block introduced into a longitudinal rolling mill after passing through the first rolling stand, that is to say in plug rolling mills after the first pass, with respect to its wall thickness with a correspondingly adapted decrease in wall thickness also in caliber jump compared to the hollow block wall thickness, although areas of the There were no caliber jumps on the plate with the rollers.
  • the same phenomenon can also be observed in the second and further stitches until the stretching in the respective framework or stitch has reached a value close to 0.
  • the invention thus proposes that the degree of thin drawing in the caliber jump of the subsequent stitch as an addition to the caliber base of the previous one Scaffolding or stab is slammed, with the aim of achieving a wall thickness profile that is uniform over the cross section.
  • the rollers are opened by moving them apart to a distance that corresponds to the wall thickness to be set in the area of the caliber base. Since in single-caliber plug rolling mills all passes have to be rolled in one and the same calibration (unlike in the case of continuous longitudinal rolling processes, for example a tube continuous line), you can get variation options of the caliber in plug rolling by setting the rolls differently for the different passes.
  • the rollers can be opened by the amount of this addition before the first stitch. If there are three stitches, the rollers can also be opened before the second stitch.
  • the wall thickness profile in the subsequent stitch in the caliber base of the previous stitch is set by appropriately designing the mathematically or empirically determined contour curve describing the caliber base. It was found that the wall thinning in the caliber jump does not necessarily take place over the entire free-formed area with a constant decrease in wall thickness, but with a different decrease in wall thickness, depending on whether one looks at the exact center of the caliber jump or the adjacent zones. A round and precisely centric calibration would possibly lead to inaccurate wall thicknesses.
  • the wall thickness itself is specified in the base of the caliber by a corresponding selection of the plug diameters. So if the wall in the base of the caliber is to receive an offer, that is Reduce the plug diameter of this stitch accordingly. However, this leads to a large number of finely graduated diameters with a correspondingly expensive storage of plugs.
  • a uniform wall thickness within the permissible tolerances can be achieved in the plug rolling system, which, according to a further process feature of the invention, enables the pipe to be produced immediately after Feeding the plug rolling process to a sizing mill, reducing mill or stretch-reducing mill.
  • Smooth rolling systems can be completely dispensed with when carrying out the method according to the invention, so that reheating of the blanks is no longer necessary because of the time savings associated therewith.
  • a reheating oven can also be omitted.
  • the plug rolling process takes on a new meaning and becomes competitive with other modern rolling processes.

Landscapes

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

Claims (3)

  1. Procédé pour fabriquer des tubes sans soudure selon le procédé de laminage à mandrin, dans lequel un bloc creux est élargi et étiré sur un mandrin fixe s'appuyant sur une barre dans une cage de laminoir à calibre fermé en au moins deux passes en une loupe, la loupe étant retirée après chaque passe au moyen d'un appareil d'entraînement de la barre à l'encontre de la direction de laminage et étant tournée, avant la passe suivante, de 90° autour de son axe longitudinal, le mandrin étant changé après chaque passe,
    caractérisé en ce que, dans le cas de plusieurs passes successives, au moins dans une passe, de préférence dans la première, une épaisseur de paroi est réglée dans la zone du fond de calibre par modification de l'écartement des cylindres, laquelle tient compte de l'amincissement de cette zone de paroi dans la passe de laminage suivante dans le sens d'une épaisseur de paroi, uniforme sur la périphérie, de la loupe laminée.
  2. Procédé selon la revendication 1,
    caractérisé en ce que le réglage de l'épaisseur de paroi dans le fond de calibre est effectué par conformation correspondante de la courbe de contour décrivant le fond de calibre, déterminée mathématiquement ou empiriquement.
  3. Procédé selon les revendications 1 et 2,
    caractérisé en ce que le tube, directement après le procédé de laminage à mandrin, est laminé avec précision, réduit ou réduit en l'étirant.
EP93250081A 1992-04-16 1993-03-12 Procédé pour la fabrication de tubes sans soudure par le procédé de laminage à mandrin Expired - Lifetime EP0566223B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4213276A DE4213276C2 (de) 1992-04-16 1992-04-16 Verfahren zum Herstellen nahtloser Rohre nach dem Stopfenwalzverfahren
DE4213276 1992-04-16

Publications (2)

Publication Number Publication Date
EP0566223A1 EP0566223A1 (fr) 1993-10-20
EP0566223B1 true EP0566223B1 (fr) 1996-01-31

Family

ID=6457263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93250081A Expired - Lifetime EP0566223B1 (fr) 1992-04-16 1993-03-12 Procédé pour la fabrication de tubes sans soudure par le procédé de laminage à mandrin

Country Status (3)

Country Link
US (1) US5412974A (fr)
EP (1) EP0566223B1 (fr)
DE (2) DE4213276C2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0698426A1 (fr) 1994-08-18 1996-02-28 MANNESMANN Aktiengesellschaft Changeur de poinçon pour laminoirs perceurs
CN102039313B (zh) * 2010-11-03 2013-11-06 攀钢集团钢铁钒钛股份有限公司 大口径气瓶用无缝钢管的生产方法
JP2014166649A (ja) * 2013-01-31 2014-09-11 Jfe Steel Corp 継目無鋼管の製造方法
DE102018112391A1 (de) 2018-01-25 2019-07-25 Sms Group Gmbh Verfahren zum Walzen eines Hohlblocks auf einem Stopfenwalzwerk, Stopfenwalzwerk, Verwendung eines Stopfenwalzwerks und Stopfenstraße

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US770195A (en) * 1903-12-26 1904-09-13 Nat Tube Co Method of rolling tubing.
US1858990A (en) * 1928-04-16 1932-05-17 Globe Steel Tubes Co Method of and means for rolling seamless tubing
JPS5143991B2 (fr) * 1973-08-23 1976-11-25
JPS62227508A (ja) * 1986-03-28 1987-10-06 Sumitomo Metal Ind Ltd 継目無管のプラグミル圧延方法
US4798071A (en) * 1986-06-25 1989-01-17 Kocks Technik Gmbh & Co. Seamless tube production
JPH0734927B2 (ja) * 1986-12-15 1995-04-19 新日本製鐵株式会社 継目無鋼管の製造方法
SU1502145A1 (ru) * 1987-12-23 1989-08-23 Уральский научно-исследовательский институт трубной промышленности Обжимной калибр инструмента дл продольной прокатки труб
DE3936326A1 (de) * 1989-10-27 1991-05-02 Mannesmann Ag Rohrwalzverfahren auf einer stopfenstrasse
DE4138178A1 (de) * 1991-11-15 1993-05-27 Mannesmann Ag Verfahren zum laengswalzen nahtloser rohre

Also Published As

Publication number Publication date
DE59301525D1 (de) 1996-03-14
EP0566223A1 (fr) 1993-10-20
DE4213276A1 (de) 1993-10-21
DE4213276C2 (de) 1996-05-23
US5412974A (en) 1995-05-09

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