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EP1949979B1 - Laminoir destiné à la fabrication de tuyaux sans fil et procédé de fonctionnement d'un laminoir - Google Patents

Laminoir destiné à la fabrication de tuyaux sans fil et procédé de fonctionnement d'un laminoir Download PDF

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Publication number
EP1949979B1
EP1949979B1 EP07023625A EP07023625A EP1949979B1 EP 1949979 B1 EP1949979 B1 EP 1949979B1 EP 07023625 A EP07023625 A EP 07023625A EP 07023625 A EP07023625 A EP 07023625A EP 1949979 B1 EP1949979 B1 EP 1949979B1
Authority
EP
European Patent Office
Prior art keywords
mandrel
tube
rolling mill
wall thickness
rolling
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.)
Not-in-force
Application number
EP07023625A
Other languages
German (de)
English (en)
Other versions
EP1949979A1 (fr
Inventor
Peter Thieven
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.)
SMS Group GmbH
Original Assignee
SMS Meer GmbH
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 SMS Meer GmbH filed Critical SMS Meer GmbH
Publication of EP1949979A1 publication Critical patent/EP1949979A1/fr
Application granted granted Critical
Publication of EP1949979B1 publication Critical patent/EP1949979B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • B21B17/06—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 discontinuous 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
    • 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
    • B21B25/02—Guides, supports, or abutments for mandrels, e.g. carriages or steadiers; Adjusting devices for mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/78—Control of tube rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product

Definitions

  • the invention relates to a rolling mill for producing seamless tubes, in particular steel tubes, comprising at least one roll stand having at least two rollers cooperatively roll the circumference of a tube blank, wherein during the rolling process in the interior of the tube blank a mandrel bar is arranged, wherein the rollers in their working position and the mandrel defines the wall thickness of the pipe to be rolled, and wherein the mandrel has a shape deviating from the circular shape in cross-section perpendicular to its longitudinal axis. Furthermore, the invention relates to a method for operating such a rolling mill.
  • Such a rolling mill is through the DE 445 482 C have become known to produce hollow rolling stock, such as pipes, including an alternation of round and oval caliber is used, which is customary from rolling mills for rolling round rolling stock, such as rods or wire.
  • a mandrel rod adapted to the changing caliber shape is used according to this known method and axially displaced by the distance from pair of rolls to pair of rolls. This is the respectively suitable mandrel rod section in the respective round or oval caliber.
  • a seamless tube can be made by inserting into a hollow block a mandrel bar through which the tube blank is rolled out to the desired tube.
  • the mandrel bar has a circular cross section; the rolling of the outer circumference of the tube blank rolls have a corresponding shape, ie they have a circular arc-shaped contour in the radial section.
  • FIGS. 1 to 3 A problem that arises in the production of a seamless pipe is in the FIGS. 1 to 3 shown.
  • the cross section through the rollers 1, 2, the tube blank 4 and the mandrel bar 5 is shown for three different constellations.
  • Fig. 1 The ideal case arises Fig. 1 ,
  • the rollers 1, 2 roll the outer circumference 3 of the tube blank 4; inside the tube blank 4, the mandrel rod 5 is arranged.
  • a separate pair of rollers 1, 2 and a separate mandrel 5 is required so that in Fig. 1 illustrated ideal constellation can be realized. This means that over different diameters of the mandrel bar the desired wall thicknesses of the tube billets are adjusted.
  • the radial adjustment is done by opening or closing the rolling caliber from the in Fig. 1 out central position, which is neutral with respect to the wall thickness uniformity.
  • Fig. 2 it can be seen that the two rollers 1, 2 - were driven towards each other in order to reduce the average Luppenwanddicke -; the distance of the axes of rotation of both rollers 1, 2 has decreased. Due to the greatly exaggerated geometric conditions is immediately apparent that the tube blank has a lower wall thickness in the upper and lower regions, while the wall thickness left and right has become relatively large. So there is a non-circular cross section before with a maximum wall thickness in the region of the edge of the roll gap.
  • Fig. 3 show that here the two rollers 1,2 - in order to increase the average Luppenwanddicke - were moved away from each other; the distance of the axes of rotation of both rolls 1, 2 has increased. It can be seen that now the tube blank 4 in the upper and lower region has a greater wall thickness, while the wall thickness has become smaller on the left and right in relation. It is thus also a non-circular cross section before with a maximum wall thickness in the middle of the roll gap.
  • the invention is therefore based on the object, a rolling mill of the type mentioned and a method for its operation in such a way that it is possible to cover with a smaller number of mandrel bars a sufficient range of tubes to be produced, at the same time a sufficient quality, namely a good roundness of the pipe should be ensured.
  • the rolling mill has rotating means with which the mandrel rod can be rotated about its longitudinal axis in a defined rotational position and held in this.
  • the rotating means may be integrated in a mandrel bar bearing which is slidably disposed.
  • two, three or four rolls are provided per roll stand.
  • the rolling mill is, in particular, a hot rolling mill, in particular a continuous bank or collision bank.
  • the invention is more preferably used in a crawl rolling mill or in a tube cold rolling mill.
  • the wall thickness of the rolled tube is measured in the rolling direction behind the at least one rolling stand and compared with a desired value, wherein the measured actual value of the wall thickness is adjusted to the desired value by means of a control device the mandrel is rotated with its shape deviating in cross section from the circular shape about its longitudinal axis.
  • results from the proposed solution the possibility to roll with less rods an equal range of different tubes.
  • the stake park can therefore be significantly reduced, in particular during the initial investment, which makes a significantly more economical production possible. Also, the plant operation is simplified.
  • Fig. 4 is a mandrel 5 according to the invention in section perpendicular to its longitudinal axis L shown. It can be seen that the cross section of the mandrel rod 5 is not circular, but has a shape deviating from the circular shape. There is a substantially to be addressed as an oval cross-sectional shape:
  • the cross section of the mandrel 5 is defined by two circular arcs 6 and 7, which are arranged symmetrically to a symmetry line 11.
  • the radii R of the two circular arcs 6, 7, which are the same size, are slightly larger than half of the smallest diameter D of the mandrel rod 5. Accordingly, there are two arranged at opposite locations, radially highest points 9 and 10 at which rounding 8 is provided are.
  • the rolling with this mandrel bar 5 is in Fig. 5 according to a standard case.
  • the two rollers 1, 2 only partially shown roll the circumference 3 of the tube blank 4 at arranged in the interior of the tube blank 4 mandrel rod 5. It results in rolling the tube blank 4 according to Fig. 5 a tube with a largely constant wall thickness d.
  • d wall thickness
  • the rollers 1, 2 are placed on each other (analogous to Fig. 2 ), as it is in Fig. 6 is shown. Due to the shape of the mandrel 5 results here nevertheless a substantially uniform wall thickness d, again though a deviation of the ideal form, but still within acceptable tolerances.
  • Fig. 7 If the outer diameter of the tube or the wall thickness d of the tube to be increased, can be proceeded as in Fig. 7 is shown.
  • the mandrel bar 5 was about its longitudinal axis L by means of the rotating means 12, which in Fig. 5 are shown only schematically, rotated by 90 °, so that the mandrel bar 5 is now "upright".
  • the rollers 1, 2 have moved away from each other, ie the rolling caliber has been ascended.
  • the wall thickness d is largely constant over the circumference of the tube.
  • the mandrel bar is selectively rotatable about its longitudinal axis and lockable in the selected position.
  • the shaft of the mandrel rod is thus designed with functional surfaces that allow accurate positioning of the angular position of the rod with the effect explained.
  • the rotating means 12 allow the targeted turning of the mandrel rod 5.
  • the rotating means are preferably integrated in the movable rod stock.
  • the proposed profile mandrels can be used both in rolling mills with two rolls per rolling stand as well as in plants with three or more rolls per rolling stand.
  • the profiled mandrel rods can be used particularly advantageously if the end wall thickness of the tube blank is not only produced by a single final rolling caliber, but is formed by combining two or more calibers lying one behind the other in the rolling direction.
  • the profile mandrel must then have a four-sided oval profile in the case of a two-roll stand, in the case of a three-roll stand, a six-sided ovaeles profile would be necessary.
  • a wall thickness measuring device is arranged behind the rolling mill, which determines the rolled wall thickness of the pipe.
  • a control can make a target-actual comparison of the desired wall thickness and then act on the rotating means 12 so that the actual value is equal to the target value. If, for example, at the highest point 13 of the tube (s. Fig. 6 ) measured a too large wall thickness d, the control, the mandrel 5 from the in Fig. 6 shown position by means of the rotating means 12 more in the in Fig. 7 turn shown (extreme) position, which reduces the wall thickness d. Accordingly, a too small wall thickness d by "turning back" the mandrel 5 of the in Fig. 7 shown position in the one according to Fig. 6 be enlarged.
  • the contour of the profile mandrel can be formed from mutually eccentric arcs or other curvilinear curves.
  • the transitions between these curves can be rounded off by transitional forms.
  • the profile shape is chosen so that when the rolling caliber is in the middle position, no larger wall thickness deviations occur than in the prior art.

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. Laminoir pour la fabrication de tubes sans soudure, notamment de tubes d'acier qui comporte au moins une cage de laminoir avec au moins deux cylindres (1, 2) qui en coopération laminent la périphérie (3) d'une ébauche de tube (4) pendant le processus de laminage, un poinçon (5) étant disposé à l'intérieur de l'ébauche de tube (4), les cylindres (1, 2) dans leur position de travail et le poinçon (5) définissant l'épaisseur de paroi (d) du tube à laminer et le poinçon (5) présentant dans sa section transversale, à la perpendiculaire de son axe longitudinal (L) une forme différente de la forme circulaire, caractérisé en ce qu'il présente des moyens de rotation (12) avec lesquels le poinçon (5) peut être tourné autour de son axe longitudinal (L) dans une position de rotation définie et maintenu dans cette dernière.
  2. Laminoir selon la revendication 1, caractérisé en ce que les moyens de rotation (12) sont intégrés dans un logement du poinçon qui est disposé de façon déplaçable.
  3. Procédé pour faire fonctionner un laminoir pour la fabrication de tubes sans soudure, notamment de tubes en acier selon la revendication 1 ou 2, caractérisé en ce qu'en direction de laminage, derrière l'au moins une cage de laminoir, l'épaisseur de paroi (d) du tube laminé est mesurée et comparée à une valeur de consigne, au moyen d'un dispositif de réglage, la valeur réelle mesurée de l'épaisseur de paroi (d) étant adaptée à la valeur de consigne, en ce que le poinçon (5) d'une forme de section transversale différente de la forme circulaire est tourné autour de son axe longitudinal (L).
EP07023625A 2007-01-27 2007-12-06 Laminoir destiné à la fabrication de tuyaux sans fil et procédé de fonctionnement d'un laminoir Not-in-force EP1949979B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007004214A DE102007004214A1 (de) 2007-01-27 2007-01-27 Walzwerk zur Herstellung nahtloser Rohre und Verfahren zum Betreiben eines Walzwerks

Publications (2)

Publication Number Publication Date
EP1949979A1 EP1949979A1 (fr) 2008-07-30
EP1949979B1 true EP1949979B1 (fr) 2011-07-13

Family

ID=39125272

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07023625A Not-in-force EP1949979B1 (fr) 2007-01-27 2007-12-06 Laminoir destiné à la fabrication de tuyaux sans fil et procédé de fonctionnement d'un laminoir

Country Status (4)

Country Link
EP (1) EP1949979B1 (fr)
AT (1) ATE516092T1 (fr)
DE (1) DE102007004214A1 (fr)
RU (1) RU2379141C2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2433876C1 (ru) * 2010-06-22 2011-11-20 Открытое акционерное общество "Электростальский завод тяжелого машиностроения" Способ изготовления бесшовной трубы и непрерывный оправочный стан для его осуществления

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB111295A (en) * 1916-11-14 1918-05-09 John George Inshaw Improvements in Devices for Connecting the Mandrels of Tube-rollingt Mills to their Holders.
DE445482C (de) * 1925-02-18 1927-06-13 Guenther Lobkowitz Fertigwalzen von vorgelochten Rundknueppeln (Luppen) zu Rohren
BE332571A (fr) * 1925-02-18
DE634384C (de) * 1933-03-29 1936-11-06 Guenther Lobkowitz Kontinuierliches Walzwerk
SU442861A1 (ru) * 1972-05-19 1974-09-15 Уральский научно-исследовательский институт трубной промышленности Оправка косовалкового стана
DE2641555A1 (de) 1976-09-15 1978-03-16 Schevtschenko Verfahren zum kontinuierlichen rohrwalzen und kontinuierliches rohrwalzwerk
JPS58163507A (ja) 1982-03-25 1983-09-28 Nippon Kokan Kk <Nkk> バ−拘束式マンドレル圧延機の入口テ−ブル
SU1488044A1 (ru) * 1987-01-04 1989-06-23 Всесоюзный научно-исследовательский и конструкторско-технологический институт трубной промышленности Способ редуцировани труб с нат жением
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

Also Published As

Publication number Publication date
RU2008102944A (ru) 2009-07-27
RU2379141C2 (ru) 2010-01-20
ATE516092T1 (de) 2011-07-15
EP1949979A1 (fr) 2008-07-30
DE102007004214A1 (de) 2008-07-31

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