EP2026917B1 - Laminoir à mandrin retenu pour tubes sans soudures - Google Patents

Laminoir à mandrin retenu pour tubes sans soudures Download PDF

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Publication number
EP2026917B1
EP2026917B1 EP06766322A EP06766322A EP2026917B1 EP 2026917 B1 EP2026917 B1 EP 2026917B1 EP 06766322 A EP06766322 A EP 06766322A EP 06766322 A EP06766322 A EP 06766322A EP 2026917 B1 EP2026917 B1 EP 2026917B1
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EP
European Patent Office
Prior art keywords
rolling
tube
rolls
roll
units
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Active
Application number
EP06766322A
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German (de)
English (en)
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EP2026917A1 (fr
Inventor
Paolo Marin
Patrizio Rinaldi
Vincenzo Palma
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 SpA
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SMS Innse SpA
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Publication date
Application filed by SMS Innse SpA filed Critical SMS Innse SpA
Publication of EP2026917A1 publication Critical patent/EP2026917A1/fr
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Publication of EP2026917B1 publication Critical patent/EP2026917B1/fr
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    • 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
    • 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 object of the present invention is a retained mandrel rolling mill for seamless tubes.
  • Continuous rolling mills for seamless tubes are known to provide a plurality of rolling units, commonly called the stands, which are sequentially arranged along a rolling axis; each rolling unit is provided with three removable working rolls, which are each equipped with a groove for accommodating the tube to be processed; the three rolls are rotatably driven about axes of rotation that are coplanar to each other and laying on a plane orthogonal to the rolling axis; a mandrel is further provided, which is suitable to be fitted within the tube cavity upon operation.
  • a rolling mill according to the preamble of claim 1 is e.g. known from WO- A 97 19767 .
  • the rolls are always employed in the same rolling unit and are processed on their outer surface when they are excessively worn, by removing material from the roll surface by means of turning.
  • roll work profile is meant that part of the roll which is in contact with the tube.
  • nominal diameter is meant twice the distance between the rolling axis and the roll axis.
  • the roll is eliminated and replaced with a new roll.
  • the rolls are oversized in order to be turned and used several times, because the roll diameter is reduced at each turning. Due to this oversizing, rolling mills are provided which are large-sized, and thus bulky and expensive. In addition, a considerable energy consumption is involved due to the large moving masses.
  • the object of the present invention is to overcome the above-mentioned drawbacks.
  • the rolling mill illustrated in Fig. 1 which is generally designated with 10, is shown in the known, general configuration thereof comprising a plurality of rolling units U, which are sequentially arranged aligned relative to each other along a rolling axis and fitted in a fixed structure S, which is suitable to connect them to each other in a rigid manner.
  • Each rolling unit U comprises a support framework 11, three working rolls 12 being mounted therein.
  • each roll 12 is pivotally mounted on a fork support 13, which is, in turn, carried by a lever 14 that is pivoted on a pivot 15.
  • the pivots 15 are rigidly connected to each other by the support framework 11.
  • the three axes X of the three rolls lay on a same plane and cross such as to form an equilateral triangle. This plane is orthogonal to the rolling axis.
  • Each roll 12 is rotatably driven by a motor 16 of its own, via a shaft 17 that is connected to the motor by means of gears.
  • a hydraulic cylinder 18 acts on each fork support 13, which cylinder has the function of adjusting the position of the roll 12 and maintaining the latter in this position by counteracting the contrary forces that are generated during the rolling process.
  • a device 19 acts on one of the hydraulic cylinders 18, which provides to move the cylinder away from its position by rotatably moving the same about a pivot 20 in the event that the support framework 11 requires to be removed from the rolling mill for servicing.
  • the series of three-roll sets 12 of the several sequential rolling units U that are designated with U1, U2, U3, U4, U5 is illustrated in a perspective view in Fig. 3 .
  • the profile of the grooves 12a of the working rolls 12 is illustrated in Fig. 4 .
  • the grooves 12a of the rolls 12 have a profile similar to an arc of circle with radiuses R5, R4, R3, R2, R1 that gradually decrease from the last rolling unit U5 to the first rolling unit U1, respectively.
  • This decrease of the groove radiuses is such that the nominal diameter "D" of the rolls 12, which is twice the distance between the rolling axis L and the roll axis X, is the same, i.e. it is unchanged from a rolling unit to the next one.
  • the rolling direction is indicated by the arrow A.
  • the roll 12 can be substantially made in two parts 12.1 and 12.2.
  • the roll part 12.1 is made as one piece with a shaft 21 integral with the shaft 17, which transmits the motion to the roll 12.
  • the roll part 12.2 is ring-shaped and the groove 12a of the roll is formed on the outer surface thereof.
  • This roll part 12.2 is made integral to the roll part 12.1 by means of keying, hot shrinkage or preferably by means of bonding.
  • the rolling mill 10 also comprises a mandrel 22, shown in Fig. 3 , which is movable along the rolling axis L and driven via known means.
  • a tube T is advanced through the series of three-roll sets 12 that are rotatably driven by the motors 16 via the drive shafts 17.
  • the mandrel 22 fitted within the tube T is also simultaneously advanced at a lower speed than the tube advancement speed.
  • the tube T with the mandrel 22 fitted therein determines a reduction in the diameter and thickness of the tube T.
  • the work profile of their groove 12a is turn such as to maintain the same nominal diameter.
  • the new profile will be such that a wider passage section than the previous profile is created through the rolling unit U.
  • the thus-processed rolls 12 are placed in the preceding rolling unit relative to the rolling direction A; for example, if the roll 12 belonged to the rolling unit U5, it is transferred to the rolling unit U4 after turning, etc.
  • the rolls 12 of the first rolling unit U1 have finished their operating life, they are eliminated.
  • the rolling mill 12 as described above and illustrated according to the invention has considerable advantages over the rolling mills described in the preamble, in which the rolls are always used in a same rolling unit.
  • the new rolls do not require to be oversized, unlike the rolls of the rolling mills described in the preamble. This is because the rolls have constant diameters in the rolling mill 10, and it is the radius of the roll groove that changes, as may be seen in Fig. 4 . Due to the above, the rolling mill 10 has a lower size relative to the rolling mills cited in the introductory part, thus being less bulky, less expensive, less energy-consuming, and providing for an easy assembly/disassembly of the rolls.
  • the adjustment of the rolls' position in the rolling mill 10 is minimal, as one does not require to compensate changes in the roll diameter. A much shorter time is thus taken for such adjustment, and accordingly less labour and management costs are required as compared with the rolling mills mentioned in the preamble.
  • the rolling mill In a rolling mill with rolls having a variable nominal diameter, the rolling mill requires to be adjusted each time that re-turned rolls are mounted thereon. This is because a different rotation speed corresponds to each nominal diameter of a roll. Furthermore, at the beginning of the rolling operations, a further adjustment is required, which can imply that a part of the production will be of low quality until the rolling mill has reached the optimum operating conditions. With the rolls always having the same nominal diameter, the adjustment of the rolling mill is much simplified and the fine-tuning step is unnecessary, thereby the entire production has the same quality level.
  • the rolling mill 10 is also advantageous when more bores have to be worked (by "bore” is meant the diameter of the tube exiting the rolling mill).
  • the new roll can start working in the last rolling unit U5 (outlet of the tube) and end working in the first rolling unit U1 (inlet of the tube); subsequently, for a larger bore, the same roll can be processed such as to be employed in the last rolling unit U5 to the first rolling unit U1.
  • the use of the roll is optimized, as it is used as much as possible and the incidence on the production cost is minimized.
  • the roll profile is re-turned one or two times with the roll being maintained in the same rolling unit.
  • the nominal diameter would undergo a minimum variation that can be compensated with an equally minimum adjustment.
  • the waste is advantageously reduced when the roll has come to the end of its life cycle.
  • the ring-shaped part 12.2 that comes in contact with the tube T can be removed from the part 12.1 when it is completely worn, and can be replaced by a new, ring-shaped part 12.2. Thereby, one avoids having to replace the entire roll, and can replace only one part thereof.
  • the several members of the rolling mill 10 can be changed in structure, operation and shape.
  • the number of rolling units can be different from that illustrated herein, according to the requirements.
  • More than three rolls may be also provided for each rolling unit.
  • the shape of the roll and the profile of its groove may also be changed from what has been illustrated above.
  • Each roll can be made as one piece. Making the roll in two pieces, as in Fig. 5 , is however particularly advantageous.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Claims (5)

  1. Laminoir (10) pour traiter des tubes sans soudure (T),
    ledit laminoir (10) définissant un axe de laminage (L) le long duquel les tubes sans soudure (T) sont déplacés dans une direction de laminage (A) pendant le traitement par ledit laminoir (10),
    ledit laminoir (10) comprenant une pluralité d'unités de laminage (U) qui sont agencées de manière séquentielle l'une à la suite de l'autre le long dudit axe de laminage (L),
    dans lequel chacune desdites unités de laminage (U) est dotée d'au moins trois cylindres de travail (12) amovibles qui peuvent être entraînés en rotation autour d'axes de rotation (X),
    dans lequel lesdits axes de rotation (X) des cylindres de travail (12) d'une unité de laminage (U) respectivement sont coplanaires entre eux et s'étendent dans un plan orthogonal audit axe de laminage (12),
    dans lequel chaque cylindre de travail (12) possède une gorge (12a) pour recevoir le tube (T) à travailler alors qu'il se déplace le long dudit axe de laminage (L),
    dans lequel lesdites gorges (12a) des cylindres de travail (12) ont un profil similaire à un arc de cercle avec un rayon de gorge (R1; R2; R3; R4; R5),
    dans lequel ledit rayon de gorge (R1; R2; R3; R4; R5) desdits cylindres de travail (12) diminue dans ladite direction de laminage (A) d'une dernière unité de laminage (U5) à une première unité de laminage (U1) desdites unités de laminage (U),
    de sorte que le tube (T) puisse être travaillé en le faisant passer dans ladite direction de laminage (A), dans les gorges (12a) des cylindres (12) des unités de laminage (U) agencées de manière successive, de sorte que le diamètre externe du tube (T) soit réduit,
    dans lequel ledit laminoir (10) comprend en outre un mandrin (22) approprié pour être ajusté dans la cavité du tube (T) pendant le traitement, de sorte que le tube (T) puisse être travaillé en le faisant passer, le mandrin (22) étant ajusté dans la cavité du tube (T), dans les gorges (12a) des cylindres (12) des unités de laminage (U) agencées de manière successive, de sorte que le diamètre extérieur du tube (T) soit réduit,
    dans lequel chaque unité de laminage (U) comprend un diamètre nominal (D) défini comme étant de deux fois la distance entre ledit axe de laminage (L) et lesdits axes de rotation (X) des cylindres de travail (12) de ladite unité de laminage (U),
    caractérisé en ce que ledit diamètre nominal (D) reste inchangé d'une unité de laminage (U) à l'unité suivante (U) et ledit laminoir (10) est configuré de sorte que les cylindres de travail (12) appartenant à l'une desdites unités de laminage (U) puissent être placés, après avoir tourné leurs gorges (12a), dans l'unité de laminage (U) précédente par rapport à la direction de laminage (A).
  2. Laminoir selon la revendication 1, dans lequel le cylindre (12) consiste en deux parties (12.1, 12.2), une première partie (12.1) étant solidaire d'un arbre d'entraînement (21) pour le cylindre (12) et une seconde partie (12.2) qui est rattachée de manière rigide à la première partie (12.1) du cylindre (12) de manière amovible.
  3. Laminoir selon la revendication 3, dans lequel la seconde partie (12.2) du cylindre (12) a une configuration sensiblement annulaire.
  4. Laminoir selon la revendication 3, dans lequel la seconde partie (12.2) du cylindre (12) est reliée à la première partie (12.1) au moyen d'une liaison.
  5. Procédé d'exploitation d'un laminoir (10) selon la revendication 1 pour le traitement de tubes sans soudure (T),
    ledit laminoir (10) définissant un axe de laminage (L) le long duquel les tubes sans soudure (T) sont déplacés dans une direction de laminage (A) pendant le traitement par ledit laminoir (10),
    ledit laminoir (10) comprenant une pluralité d'unités de laminage (U) qui sont agencées de manière séquentielle l'une à la suite de l'autre le long dudit axe de laminage (L),
    dans lequel chacune desdites unités de laminage (U) est dotée d'au moins trois cylindres de travail (12) amovibles qui peuvent être entraînés en rotation autour d'axes de rotation (X),
    dans lequel lesdits axes de rotation (X) des cylindres de travail (12) d'une unité de laminage (U) respectivement sont coplanaires entre eux et s'étendent dans un plan orthogonal audit axe de laminage (12),
    dans lequel chaque cylindre de travail (12) possède une gorge (12a) pour recevoir le tube (T) à travailler alors qu'il se déplace le long dudit axe de laminage (L),
    dans lequel lesdites gorges (12a) des cylindres de travail (12) ont un profil similaire à un arc d'un cercle avec un rayon de gorge (R1; R2; R3; R4; R5),
    dans lequel ledit rayon de gorge (R1; R2; R3; R4; R5) desdits cylindres de travail (12) diminue dans ladite direction de laminage (A) d'une dernière unité de laminage (U5) à une première unité de laminage (U1) desdites unités de laminage (U),
    de sorte que le tube (T) puisse être travaillé en le faisant passer dans ladite direction de laminage (A), dans les gorges (12a) des cylindres (12) des unités de laminage (U) agencées de manière successive, de sorte que le diamètre externe du tube (T) soit réduit,
    dans lequel ledit laminoir (10) comprend en outre un mandrin (22) approprié pour être ajusté dans la cavité du tube (T) pendant le traitement, de sorte que le tube (T) puisse être travaillé en le faisant passer, le mandrin (22) étant ajusté dans la cavité du tube (T), dans les gorges (12a) des cylindres (12) des unités de laminage (U) agencées de manière successive, de sorte que le diamètre extérieur du tube (T) soit réduit,
    dans lequel chaque unité de laminage (U) comprend un diamètre nominal (D) défini comme étant de deux fois la distance entre ledit axe de laminage (L) et lesdits axes de rotation (X) des cylindres de travail (12) de ladite unité de laminage (U),
    caractérisé par les étapes consistant à :
    - prévoir lesdits cylindres de travail (12) de sorte que ledit diamètre nominal (D) reste sensiblement inchangé d'une unité de laminage (U) à l'unité suivante (U),
    - faire tourner lesdites gorges (12a) desdits cylindres de travail (12) lorsqu'ils sont usés, augmentant ainsi son rayon de gorge,
    - placer les cylindres de travail (12) appartenant à l'une desdites unités de laminage (U), après avoir tourné leurs gorges (12a), dans l'unité de laminage (U) précédente par rapport à ladite direction de laminage (A).
EP06766322A 2006-06-12 2006-06-12 Laminoir à mandrin retenu pour tubes sans soudures Active EP2026917B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2006/000438 WO2007144905A1 (fr) 2006-06-12 2006-06-12 Laminoir à mandrin retenu pour tubes sans soudures

Publications (2)

Publication Number Publication Date
EP2026917A1 EP2026917A1 (fr) 2009-02-25
EP2026917B1 true EP2026917B1 (fr) 2010-08-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06766322A Active EP2026917B1 (fr) 2006-06-12 2006-06-12 Laminoir à mandrin retenu pour tubes sans soudures

Country Status (11)

Country Link
US (1) US20090090153A1 (fr)
EP (1) EP2026917B1 (fr)
CN (1) CN101460264B (fr)
AR (1) AR061334A1 (fr)
AT (1) ATE478741T1 (fr)
BR (1) BRPI0621813A2 (fr)
DE (1) DE602006016499D1 (fr)
EA (1) EA014479B1 (fr)
MX (1) MX2008015709A (fr)
SA (1) SA07280314B1 (fr)
WO (1) WO2007144905A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20111391A1 (it) * 2011-07-26 2013-01-27 Sms Innse Spa Cartuccia portarulli per un laminatoio
CN105098352A (zh) * 2015-07-31 2015-11-25 瑞声精密制造科技(常州)有限公司 移动终端
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
CN110935731A (zh) * 2019-12-09 2020-03-31 杭州淳通新材料科技有限公司 多辊围绕式高精密度无缝锥管成型辊模
KR102322805B1 (ko) * 2020-01-23 2021-11-10 가천대학교 산학협력단 다층구조 핵연료 피복관 제조방법
CN113441554A (zh) * 2021-06-22 2021-09-28 厦门语璃沫贸易有限公司 一种高精度钢管热轧设备

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3025897C2 (de) * 1980-07-09 1986-05-07 Kocks Technik Gmbh & Co, 4010 Hilden Rohrwalzwerk, insbesondere Streckreduzierwalzwerk
DE3703756A1 (de) * 1987-02-07 1988-08-18 Kocks Technik Walzgeruest zum walzen von stab- oder rohrfoermigem gut
WO1991001824A1 (fr) * 1989-08-03 1991-02-21 Tubemill S.A. Dispositif elongateur-egalisateur de corps creux ronds destines a la fabrication de tubes sans soudure
IT1271808B (it) * 1994-12-28 1997-06-09 Innocenti Eng Spa Unita' di laminazione per corpi tubolari o astiformi in genere
IT1279085B1 (it) * 1995-11-29 1997-12-04 Innocenti Eng Spa Unita' per la laminazione per tubi su mandrino
IT1298750B1 (it) * 1998-03-18 2000-02-02 Demag Italimpianti Spa Laminatoio a bracci oscillanti,destinato in particolare ma non esclusivamente alla laminazione di tubi senza saldatura
DE20320404U1 (de) * 2002-09-30 2004-06-24 Kocks Technik Gmbh & Co Walzgerüst zum Walzen von stab- oder rohrförmigem Gut
DE602004029995D1 (de) * 2003-03-26 2010-12-23 Sumitomo Metal Ind Verfahren zur herstellung eines nahtlosen rohrs

Also Published As

Publication number Publication date
CN101460264B (zh) 2011-12-21
WO2007144905A8 (fr) 2008-02-28
AR061334A1 (es) 2008-08-20
WO2007144905A1 (fr) 2007-12-21
DE602006016499D1 (de) 2010-10-07
EA014479B1 (ru) 2010-12-30
EA200802416A1 (ru) 2009-06-30
EP2026917A1 (fr) 2009-02-25
ATE478741T1 (de) 2010-09-15
MX2008015709A (es) 2009-03-25
BRPI0621813A2 (pt) 2011-12-20
US20090090153A1 (en) 2009-04-09
SA07280314B1 (ar) 2011-06-22
CN101460264A (zh) 2009-06-17

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