EP0445899B1 - Méthode pour manufacture pour tubes sans couture avec épaisseurs moyennes et minces et dispositif de laminage d'exécution - Google Patents

Méthode pour manufacture pour tubes sans couture avec épaisseurs moyennes et minces et dispositif de laminage d'exécution Download PDF

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Publication number
EP0445899B1
EP0445899B1 EP91250045A EP91250045A EP0445899B1 EP 0445899 B1 EP0445899 B1 EP 0445899B1 EP 91250045 A EP91250045 A EP 91250045A EP 91250045 A EP91250045 A EP 91250045A EP 0445899 B1 EP0445899 B1 EP 0445899B1
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EP
European Patent Office
Prior art keywords
rolling
section
angle
rollers
reducing
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
EP91250045A
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German (de)
English (en)
Other versions
EP0445899A1 (fr
Inventor
Rolf Dr. Kümmerling
Manfred Dr.-Ing. Bellmann
Horst Dr.-Ing. Biller
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
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Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6401745&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0445899(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0445899A1 publication Critical patent/EP0445899A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • B21B19/06—Rolling hollow basic material, e.g. Assel mills
    • B21B19/10—Finishing, e.g. smoothing, sizing, reeling

Definitions

  • the invention relates to a cross rolling mill for the production of medium and thin-walled seamless pipes according to the preamble of claim 1.
  • a disadvantage of the stopper rolling process is that the stopper rolling mill has to be followed by two parallel smoothing mills (Reeler) and a sizing or reducing mill in order to equalize the wall thickness beads resulting from longitudinal rolling and to achieve an acceptable roundness for performance reasons.
  • many scaffolding locations mean high investment costs and a corresponding inventory of rolling stands.
  • the last forming step is only a calibration with a usual number of stands, but the surface quality, in particular the wall thickness tolerances of the piled pipe, no longer correspond to the increased ones in most cases Conditions.
  • a generic cross-rolling mill for stretching seamless tubes is known. It consists essentially of driven rollers, the surfaces of which taper conically towards the ends and are cylindrical on a central section.
  • the rollers work together with a mandrel, which is held by a mandrel rod supported in an abutment.
  • the inclined axes of the rollers intersect in the plane that is perpendicular to the tube axis. This level is called the crossing level. It is essential that the cylindrical central section of the roller lies at least half or more in front of the crossing plane. This arrangement has the disadvantage that this leads to markings on the pipe, since the change in wall thickness in this area first increases and then decreases again.
  • GB-A-21 78 353 describes a stretching unit of conventional design, which is also known in the art as an Assel or Diescher cross-rolling mill. Significant wall thickness reductions are achieved with this rolling mill. By displacing the inner tool during rolling, wall upsets should preferably be produced at the two pipe ends.
  • the object of the invention is to provide a cross-rolling mill for the production of medium and thin-walled seamless tubes with a diameter / wall thickness ratio in the range from 15: 1 to 50: 1, with which, starting from an elongated hollow body with the smallest possible technical investment, the desired finished dimensions with good Surface quality and in compliance with the prescribed dimensional tolerances can be achieved by reducing smoothing.
  • the main idea of the invention is to shape the elongated hollow body produced by various processes to the desired finished dimension by rolling in as few as possible a rolling pass, thereby significantly reducing the diameter and at the same time smoothing the inner surface using an inner tool.
  • this ideal design with only a single rolling unit can only be realized if the relevant framework conditions exist, i.e. there must be an ideal hollow body with regard to tolerances and surface glide, which is then rolled to a dimension that is related the tolerances and the roundness represent an optimum, so that a subsequent calibration can be dispensed with.
  • the proposed rolling process is a combination of conventional smoothing (reeling) and diameter reduction, the rolling process can also be called reducing smoothing or reducing reeling, which in principle can also be used for cold rolling.
  • Another advantage is the fact that the reduction degree can also be set so that the diameter decrease is almost zero or the incoming hollow body is expanded as in conventional smoothing.
  • This method is very adaptable and can be used for different requirements.
  • the rolling method according to the invention is particularly advantageous when the incoming hollow body is first reduced in diameter when viewed in the rolling direction and the inner surface is smoothed immediately thereafter.
  • This proposed sequence has the advantage that, depending on the utilization of the reducing part, it can both be reduced more or less and can be smoothed conventionally. In principle, one can also reverse the sequence without leaving the inventive idea, ie first smooth and then reduce.
  • the measure of moving the inner tool when rolling on or off has the purpose of avoiding rolling or rolling plugs. If the process is limited to these phases, then during the remaining rolling time you have the condition of the stationary inner tool with the risk of scaling building up. If you want to avoid this, the inner tool must also be moved during the festive season. The design measures required for this are explained below.
  • the usual smoothing mills are designed in the inlet section either as a barrel or as a divergent cone with a reduction angle of up to approx. 2 degrees (Hutnicke listy 38 (1983) No. 11, pages 779 - 782).
  • the inlet part of the roller according to the invention is followed by an almost cylindrical smoothing part with an arc-shaped transition with a difference angle to the working part of the inner tool of greater than 0 to less than 1.0 degrees, which is then followed by the outlet part.
  • the discharge part has the task of rounding the rolling stock.
  • the rolling stock In order for a reduction in diameter to be possible in the reduction smoothing or reducing reel carried out with the device according to the invention, the rolling stock must additionally be supported by two guides lying opposite one another and the forming zone closed.
  • the cylindrical or slightly conical working part of the inner tool extends axially over a larger area than the smoothing part of the rolls, the beginning of the working part of the inner tool lying in the rolling direction before the start of the smoothing part of the rolls. Due to the greater length of the working part of the inner tool compared to the smoothing part of the rollers, the inner tool does not need to be as precise be positioned. In addition, the wear of the inner tool is reduced, since by changing the position of the inner tool between two successive rolling periods, the load maximum is always in one place of the working part. With regard to a starting aid when the hollow body runs into the rolling device according to the invention, it is further proposed that the reducing part be preceded by a feed part with a feed angle of approximately 1 degree.
  • an additional torque generated by the tapered pull-in part is desired, which helps to bring the high body to be rolled up to the smoothing part without it getting stuck in the reducing part due to the ovality caused by the reduction.
  • the method reversal which is possible in principle, that is to say only smoothing, when the end of the hollow body has left the smoothing part, no additional torque is available and end plugs can occur with thin-walled tubes.
  • end plugs can be avoided by providing a tapered rolling part on the inner tool, which, however, could not be moved against the rolling direction in order to avoid scale build-up during rolling.
  • the conical to slightly conical (divergent) working part with a conical section.
  • This section lies fully against the inner surface of the incoming hollow body in the rolling or rolling phase.
  • the angle of this section is almost equal to the reduction angle of the rollers.
  • the position of the inner tool is chosen so that the overlap from the rolling part to the working part of the inner tool lies in the same plane perpendicular to the rolling axis as the transition from the reducing part to the smoothing part of the rollers.
  • the inner tool is pushed against the rolling direction, so that the transition from the rolling part to the working part of the inner tool is in the area of the reducing part of the roller.
  • the displacement of the inner tool against the rolling direction should be at least so large that there is no wall deformation by the inner tool in the reducing part.
  • the rolling part and the effective smoothing part of the inner tool do not follow one another directly. In between is a section that does not take on any deformation tasks. This section is preferably designed as an extension of the smoothing part that is not effective in terms of deformation technology.
  • This embodiment of the inner tool has the advantage that the exact match between the beginning of the smoothing roller and the smoothing part of the inner tool is not necessary. This gives you more leeway to set the position of the inner tool. Above all, differences in the peripheral material speed over the length, which cannot be avoided for every setting with the same working length in the reduction part of the roller and inner tool, are noticeably less noticeable. Put simply, this means that the risk of inadmissible torsion of the hollow body to be rolled around the longitudinal axis when reducing while in contact with the internal tool is significantly reduced.
  • the rollers of the roller device can not only have the usual transport angle, but also an angle of spread against the roller axis.
  • This variant is particularly advantageous if the point of intersection of the axes of the rolls with the roll axis, as seen in the rolling direction, lies behind the rolling mill, the transport angle being set to zero in the process.
  • the size of the spreading angle is selected so that the circumferential speed of the rollers decreases in proportion to the decreasing hollow body diameter for the mean diameter of the predetermined dimension range in the reducing part. This results in zero slip and with a linear contact of the roller and the hollow body for the hollow body, the same angular velocity for each point on its axis.
  • this preferably selected spreading angle optimizes the change in the circumferential speed of the roller over the length such that the roller and the hollow body to be rolled, such as the gears of a transmission, roll on one another, thereby twisting the rolling stock as little as possible about its longitudinal axis.
  • the inner tool 17 has a cylindrical working part 12 which is extended so far counter to the rolling direction that it protrudes over half the length of the reducing part 9 of the roller 1. This is followed by a radial jump with a conical rolling part 18, the cone angle of which is approximately equal to the cone angle of the reducing part 9 of the roller 1.
  • This rolling part 18 extends in the longitudinal direction to the beginning of the reducing part 9 of the roller 1 or until the transition from the reducing part 9 to the drawing-in part 7 of the roller 1.
  • the smoothing part 11 encloses with the working part 12 of the inner tool 17 a difference angle in the range from 0 to less than 1 degree.
  • FIG. 2 shows a half longitudinal cross section through the rolling device, but with a displaceable inner tool during different rolling phases.
  • the same reference numerals are used for the same parts as in FIG. 1.
  • the inner tool 15 shown in FIG. 2 in the partial images a - c has two different sections.
  • the working part 12 is cylindrical, which, in contrast to FIG. 1, is preceded by a conical rolling part 16.
  • the cone angle of this rolling part 16 is almost equal to the cone angle of the reducing part 9 of the roller 1.
  • the inner tool 15 is adjusted relative to the roller 1 so that the transition from the working part 12 to the rolling part 16 of the inner tool 15 lies in the plane of the transition from the smoothing part 11 to the reducing part 9 of the roller 1.
  • the rolling-on phase is ended according to partial image b) when the hollow body 5 reaches the transition plane described.
  • the inner tool 15 is advanced so far against the rolling direction 6 that the transition region of the inner tool 15 lies in the reducing part 9 of the roller and the incoming hollow body 5 on Rolled part 16 of the inner tool 15 no longer comes into contact.

Landscapes

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

Claims (6)

  1. Laminoir à cylindres obliques pour la réalisation de tubes à parois moyennes et minces sans soudure, à partir d'un corps creux (5) chauffé et étiré en longueur, comportant deux cylindres (1) entraînés dans le même sens et présentant une partie d'entrée (9) et une partie de sortie (13), cylindres qui sont montés de façon inclinée par rapport à l'axe de laminage (14) d'un angle de transport, ainsi qu'un élément de guidage agencé dans un plan tourné de 90° par rapport au plan des cylindres, et un outil interne (15,17) fixé sur une tige de maintien et présentant une partie de travail (12), la partie de travail (12) de l'outil interne (15,17) présentant une longueur plus grande que la partie de lissage (11) des cylindres (1), le début de la partie de travail (12) de l'outil interne (15,17) arrivant en contact dans le sens de laminage (6) par le coulissement de celui-ci devant le début de la partie de lissage (11) des cylindres (1),
    caractérisé en ce que, dans le sens de laminage (6), une partie d'introduction (7) présentant un angle d'introduction d'à peu près 1 degré est montée en amont de la partie d'entrée, et la partie d'entrée des cylindres (1) est formée comme partie de réduction (9) présentant un angle de reduction situé dans un domaine de 3 à 5 degrés, et à laquelle est raccordée, au moyen d'une jonction (10) en forme d'arc de cercle, une partie de lissage (11) à peu près cylindrique présentant un angle de différence par rapport à la partie de travail (12) de l'outil interne (15,17) dans un domaine de 0 degré à plus petit que 1,0 degré, à la suite de laquelle se trouve alors la partie de sortie (13) pour le cintrage, et l'élément de guidage comporte deux règles de guidage fixes opposées.
  2. Dispositif de laminage selon la revendication 1,
    caractérisé en ce que les axes des cylindres (1) présentent un angle d'écartement par rapport à l'axe de laminage.
  3. Dispositif de laminage selon la revendication 2,
    caractérisé en ce que le point où se coupent les axes des cylindres (1) avec l'axe de laminage se trouve, dans le sens de laminage (6), derrière le laminoir, l'angle de transport étant ramené dans ce cas de façon théorique à 0.
  4. Dispositif de laminage selon la revendication 3,
    caractérisé en ce que la valeur de l'angle d'écartement est choisie de sorte que, pour le diamètre central de la zone de mesure prédéfinie de la partie de réduction (9), la vitesse périphérique des cylindres (1) décroit proportionnellement vers le diamètre décroissant du corps creux
  5. Dispositif de laminage selon la revendication 1,
    caractérisé en ce que l'outil interne (15) comporte en plus de la partie de travail cylindrique (12), un tronçon (16) de forme conique, qui y est raccordé et qui repose contre la surface interne du corps creux (5) à laminer uniquement au début et à la fin du laminage, et dont l'angle de cône est à peu près égal à l'angle de réduction des cylindres (1).
  6. Dispositif de laminage selon la revendication 5,
    caractérisé en ce que la partie de travail (12) de l'outil interne (17) présente pour le lissage un prolongement dans le sens opposé au sens de laminage (6), le prolongement s'étendant sur la moitié de la longueur de la partie de réduction (9) du cylindre (1), et une partie de laminage (18) formée de façon convergente, en forme de cône, et présentant un tronçon arrondi y étant raccordée, partie de laminage qui repose lors du laminage sur la surface interne du bloc creux (5) qui entre, et dont l'angle de cône est à peu près égal à l'angle de réduction, et qui s'étend jusque dans la zone du début de la partie de réduction (9).
EP91250045A 1990-03-06 1991-02-14 Méthode pour manufacture pour tubes sans couture avec épaisseurs moyennes et minces et dispositif de laminage d'exécution Expired - Lifetime EP0445899B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4007406 1990-03-06
DE4007406A DE4007406C2 (de) 1990-03-06 1990-03-06 Verfahren zur Herstellung von mittel- und dünnwandigen nahtlosen Rohren und Walzeinrichtung zur Durchführung des Verfahrens

Publications (2)

Publication Number Publication Date
EP0445899A1 EP0445899A1 (fr) 1991-09-11
EP0445899B1 true EP0445899B1 (fr) 1995-05-03

Family

ID=6401745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91250045A Expired - Lifetime EP0445899B1 (fr) 1990-03-06 1991-02-14 Méthode pour manufacture pour tubes sans couture avec épaisseurs moyennes et minces et dispositif de laminage d'exécution

Country Status (5)

Country Link
US (1) US5115656A (fr)
EP (1) EP0445899B1 (fr)
JP (1) JP3041068B2 (fr)
CZ (1) CZ285292B6 (fr)
DE (2) DE4007406C2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19731055A1 (de) * 1997-07-19 1999-01-21 Dynamit Nobel Ag Vorrichtung und Verfahren zum Einformen einer Rillenstruktur in ein rohrförmiges Werkstück
CN107363097A (zh) * 2017-08-30 2017-11-21 广东冠邦科技有限公司 管坯连续轧制的下料方法及设备
CN109859862B (zh) * 2019-01-31 2022-04-29 西部新锆核材料科技有限公司 一种锆合金燃料组件导向管及其制备方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1368413A (en) * 1919-03-26 1921-02-15 Ralph C Stiefel Tube-rolling mechanism
BE387492A (fr) * 1931-04-04
US1964507A (en) * 1933-01-26 1934-06-26 Diescher Tube Mills Inc Mandrel feeding apparatus
US2005125A (en) * 1933-03-14 1935-06-18 Bannister Bryant Apparatus for sinking tubular work pieces
DE743823C (de) * 1936-12-19 1944-01-03 Roehrenwerke Ag Deutsche Schraegwalzwerk zur Herstellung insbesondere duennwandiger nahtloser Rohre
US2334853A (en) * 1940-01-03 1943-11-23 Nat Tube Co Seamless tube reeling
DE948682C (de) * 1952-08-12 1956-09-06 Phoenix Rheinrohr Ag Vereinigt Schulterwalzwerk zum Streckreduzieren vorzugsweise starkwandiger Rohre
DE2715847C2 (de) * 1977-04-06 1980-01-24 Mannesmann Ag, 4000 Duesseldorf Kalibrierung für ein Schrägwalzwerk
DE3013127A1 (de) * 1980-04-01 1981-10-15 Mannesmann AG, 4000 Düsseldorf Schraegwalzwerk zum herstellen nahtloser rohre
EP0204878B1 (fr) * 1985-02-18 1989-10-11 MANNESMANN Aktiengesellschaft Laminoir en croix
DE3622678A1 (de) * 1985-07-12 1987-01-15 Kocks Technik Verfahren und vorrichtung zum querwalzen nahtloser rohrluppen
DE3533119A1 (de) * 1985-09-17 1987-03-26 Kocks Technik Schraegwalzgeruest zum walzen von hohlbloecken
DE3710193C1 (de) * 1987-03-27 1988-05-19 Mannesmann Ag Verfahren zum Herstellen nahtloser Rohre ueber 200 mm Durchmesser und Vorrichtung zur Durchfuehrung des Verfahrens

Also Published As

Publication number Publication date
JPH04224008A (ja) 1992-08-13
US5115656A (en) 1992-05-26
DE4007406A1 (de) 1991-09-12
DE59105350D1 (de) 1995-06-08
DE4007406C2 (de) 1994-01-20
JP3041068B2 (ja) 2000-05-15
CS9100481A2 (en) 1991-09-15
EP0445899A1 (fr) 1991-09-11
CZ285292B6 (cs) 1999-06-16

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