EP3174649A1 - Installation compacte pour le laminage de tubes sans soudure - Google Patents

Installation compacte pour le laminage de tubes sans soudure

Info

Publication number
EP3174649A1
EP3174649A1 EP15747555.9A EP15747555A EP3174649A1 EP 3174649 A1 EP3174649 A1 EP 3174649A1 EP 15747555 A EP15747555 A EP 15747555A EP 3174649 A1 EP3174649 A1 EP 3174649A1
Authority
EP
European Patent Office
Prior art keywords
rolling
mandrel
plant
rod
plug
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.)
Withdrawn
Application number
EP15747555.9A
Other languages
German (de)
English (en)
Inventor
Fabio Giovanni Antonio LACAPRUCCIA
Ubaldo Paolo PROVINCIALI
Jacopo Grassino
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
Original Assignee
SMS Innse SpA
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 Innse SpA filed Critical SMS Innse SpA
Publication of EP3174649A1 publication Critical patent/EP3174649A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • 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
    • B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills

Definitions

  • the present invention relates to a compact plant for rolling tubes, in particular for rolling seamless tubes.
  • the invention also relates to a method for this rolling operation.
  • a mandrel for the subsequent rolling operation is then inserted inside the pierced blank.
  • the pierced blank is in fact then passed through a multi-stand rolling mill with longitudinal material flow (which will be referred to below as "longitudinal mill”) able to gradually thin the wall through a suitable reduction of the outer diameter, thus increasing the length of the finished product.
  • This rolling mill as is known, comprises a plurality of rolling units. Each unit comprises a stand on which rolls with profiled grooves are mounted. The set of connected profiles of the grooves of the rolls defines the outer profile of the tube released by the rolling unit. Downstream of the longitudinal mill, the tube must be first extracted from the mandrel.
  • this operation is performed by means of another rolling mill which generally has three or more stands, called an extracting mill.
  • the extracting mill performs a small reduction in the outer diameter of the tube, with the main aim of allowing the mandrel to perform the stroke necessary for extraction from the semi-finished tube which has just been produced, also called "mother tube”.
  • the tube must be sized so as to define more precisely its outer diameter.
  • These functions may be performed by a corresponding number of independent machines, called an extracting mill, reducing mill and sizing mill, respectively. More often a single machine may instead perform several functions and thus, for example, the extracting/reducing mill or the reducing/sizing mill is obtained.
  • the tube must only undergo the inspection and/or finishing operations.
  • the inspection operations may consist of pressure tests and checks which are nondestructive, for example using ultrasound.
  • the finishing operations may instead consist of cutting to size, cleaning, painting and marking.
  • the set of operations described above constitutes the core of the tube production process; in fact at the end of these operations the main characteristics of the tube (i.e. the wall thickness and the outer diameter) are defined.
  • the assembly consisting of rotary piercer, longitudinal mill, extracting mill, reducing mill and/or sizing mill defines the main part of the plant, also called technological part.
  • the entire of the layout of the production site, in terms of civil engineering and structural work, must be designed on the basis of the technological part.
  • the apparatus necessary for the inspection and/or finishing operations may be usually arranged without significant constraints around the main part of the plant.
  • transverse flow rolling performed in the piercer
  • longitudinal flow rolling performed in the multi-stand rolling mill
  • the rolling in which the mandrel is retained and extracted online immediately downstream of the rolling mill ensures quality of the finished product and reliability far greater than those of other known configurations, in which the mandrel is released and/or free and in which extraction thereof is performed afterwards and off-line.
  • multi-stand longitudinal rolling is suitable for obtaining very high diameter/thickness ratios, where "diameter/thickness ratio” is understood as meaning the ratio between the outer diameter of the tube and the thickness of the tube wall.
  • diameter/thickness ratios obtained by means of multi- stand longitudinal rolling reach values of about 48-50, i.e. much higher than the ratios which may be obtained with other configurations of a different kind, such as that using transverse flow double rolling, where the ratios are generally less than 30- 35.
  • the plants of the known type produce so-called double-length semi-finished tubes, i.e. with lengths of up to about 32 metres. Obviously all the dimensions of the plant must be defined on the basis of this final tube size. This size and other parameters are such that, for example, the main building of the production site must have dimensions which exceed the standard market dimensions. Such a building may for example have a main span which is nearly 45 metres and a length which measures more than 900 metres.
  • the transportation of the pierced blank from the piercer to the longitudinal mill may require from 50 to 70 seconds.
  • the pierced blank tends to disperse heat into the environment, thus reaching the longitudinal mill in a substantially colder condition, typically at a temperature of between about 1050°C and about 1 150°C, depending on the form of the said pierced blank.
  • the more the temperature of the pierced blank drops the more the forces which must be applied by the rolling mill increase in order to obtain the desired plastic deformation of the material.
  • the value of the forces to be applied determines the size of the actuators and the motors of the rolling mill, as well as the power consumption of the latter during rolling.
  • the pierced blank is treated internally with anti-oxidising agents, typically borax or substances similar thereto.
  • anti-oxidising agents typically borax or substances similar thereto.
  • the object of the present invention is therefore that of overcoming at least partially the drawbacks mentioned above with reference to the prior art.
  • a task of the present invention is to provide a plant for rolling seamless tubes which may be more compact.
  • a task of the present invention is to provide a plant for the hot rolling of seamless tubes which is sustainable from the environmental point of view, due to the reduction, during the normal production process, of the consumption of electricity and gas, of the emission levels and of the pollutants.
  • a task of the present invention is to provide a compact plant for roiling seamless tubes which allows the negative effects of exposure to air of the pierced blank to be avoided or at least reduced, thus reducing the formation of scale and increasing the yield of the plant.
  • a task of the present invention is to provide a compact plant for the rolling of seamless tubes which requires a smaller initial outlay and which allows the operating costs to be kept low.
  • FIG. 1 shows a plan view diagram of a complete rolling plant according to the prior art
  • FIG. 2 shows, on the same scale as Figure 1, a plan view diagram of a complete rolling plant according to the invention
  • FIG. 3 shows the technological part of a plant according to the prior art, indicated by III in Figure 1;
  • FIG. 4 shows, on the same scale as Figure 3, the technological part of a plant according to the invention, indicated by IV in Figure 2;
  • FIG. 5 shows a plan view of a plant according to the invention similar to that of Figure 4;
  • FIG. 6 shows a detailed view of the plant part according to the invention indicated by VI in Figure 5;
  • Figure 7 shows a possible variant of the plant shown in Figure 6;
  • FIG. 9 shows a mandrel used in some plants according to the invention.
  • FIG. 10 shows a rod used in some plants according to the invention.
  • - Figure 1 1 shows a type of mandrel/rod assembly used in some plants according to the invention
  • - Figure 12 shows another type of mandrel/rod assembly used in some plants according to the invention.
  • the plant for rolling a seamless tube according to the invention is denoted in its entirety by 10. It comprises:
  • a rotary piercer 20 comprising two skew-axis rolling rolls and a plug 22 mounted on a rod 24, the rotary piercer 20 defining a rolling axis X R and being designed to:
  • the axes of rotation of the rolling rolls are skew.
  • Skw-axis is used to define machines in which the rolling rolls have axes which are not parallel to each other and which do not lie in the same plane. These machines are also defined as “transverse rolling 1 ' machines.
  • the rolling mill 30 is a machine of the so-called “longitudinal rolling” type in that the axes of the rolling rolls of each stand lie in a same plane which is orthogonal to the rolling axis.
  • the rolling axes XPR and XLL coincide means that the pierced blank 12 output from the rotary piercer 20 may be fed directly to the longitudinal mill 30, without any need to displace it laterally.
  • the pierced blank 12 By means of a simple axial movement the pierced blank 12, still engaged on the rod 24 of the rotary piercer 20, is brought into the vicinity of the mandrel 32 of the longitudinal mill 30 in a simple and rapid manner.
  • This axial movement may be performed preferably by means of suitable known devices which, by way of a non-exclusive example, may be motor-driven rolls of the pressure type commonly known as "pinch rolls" or of a similar type.
  • the rod 24 at the output of the rotary piercer 20, which is axially aligned with the mandrel 32, directly comes into contact with the end of the latter.
  • the pierced blank 12 may therefore be slid directly from the rod 24 to the mandrel 32 so that it can be conveyed away for longitudinal rolling.
  • the embodiments of the plant 10 in which the rod 24 is structurally connected to the mandrel 32 may advantageously use two solutions.
  • the rod 24 and the mandrel 32 are made as one piece, while in accordance with a second solution the rod 24 and the mandrel 32 are connected together releasably.
  • Both the solutions have specific advantages and positive features and the choice of one as opposed to the other may be made depending on the specific needs.
  • the longitudinal mill 30 may also be designed with forms which differ slightly.
  • this rolling mill has advantageously the rolls movable radially in order to adjust the position thereof and therefore the force applied during rolling, resulting in the formation of the semi-finished tube 13 from the pierced blank 12.
  • the longitudinal mill 30 is of the type comprising two rolls for each rolling station.
  • This type of longitudinal mill is particularly compact, reliable and low-cost. According to this type of rolling mill, for example, since the two rolls of each station are operated by the same motor, it is sufficient to use a number of motors equal to the number of rolling stations contained therein. This obviously results in advantages in terms of initial cost, operating consumption, complexity (which is lower) and overall reliability.
  • the induction furnace 60 constitutes a particularly compact and simple solution for dealing with the need to raise the temperature of semi-finished tube 13.
  • This furnace in fact has particularly small dimensions since it is formed simply by a short tunnel inside which the semi-finished tube 13 is axially displaced.
  • Special circuits create induction currents in the metal mass of the tube and these currents determine heating thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Physical Vapour Deposition (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

La présente invention concerne une installation compacte (10) pour laminer un tube sans soudure. L'installation comprend un perceur rotatif (20) qui définit un axe de laminage XPR et qui est conçu pour percer une billette (11) poussée contre un poinçon (22) monté sur une tige de manière à obtenir une ébauche percée (12). La tige est reliée à un bloc de butée (26) conçu pour s'opposer à la poussée axiale pendant le perçage. L'installation comprend également un laminoir longitudinal (30) qui définit un axe de laminage XLL et qui est conçu pour laminer l'ébauche percée (12) sur un mandrin (32) de manière à obtenir un tube semi-fini (13). Le mandrin est relié à un bloc de retenue (34) conçu pour donner au mandrin une vitesse prédéterminée pendant le laminage. Dans l'installation (10) selon l'invention, les axes de laminage XPR et XLL coïncident. L'invention concerne également un procédé pour laminer un tube sans soudure.
EP15747555.9A 2014-07-31 2015-07-09 Installation compacte pour le laminage de tubes sans soudure Withdrawn EP3174649A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20141399 2014-07-31
PCT/IB2015/055193 WO2016016751A1 (fr) 2014-07-31 2015-07-09 Installation compacte pour le laminage de tubes sans soudure

Publications (1)

Publication Number Publication Date
EP3174649A1 true EP3174649A1 (fr) 2017-06-07

Family

ID=51628374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15747555.9A Withdrawn EP3174649A1 (fr) 2014-07-31 2015-07-09 Installation compacte pour le laminage de tubes sans soudure

Country Status (7)

Country Link
US (1) US20170165729A1 (fr)
EP (1) EP3174649A1 (fr)
JP (1) JP2017522191A (fr)
CN (1) CN106660087A (fr)
AR (1) AR101373A1 (fr)
RU (1) RU2017106031A (fr)
WO (1) WO2016016751A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017105582A1 (de) * 2016-04-01 2017-10-05 Sms Group Gmbh Verfahren und Anlage zur Herstellung eines nahtlosen warmgewalzten Rohres sowie gewalztes Schleudergussrohr und die Verwendung eines durch Schleuderguss hergestellten Hohlblocks

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US401145A (en) * 1889-04-09 John ii
DE1427915B2 (de) * 1962-11-29 1973-01-11 Fa. Friedrich Kocks, 4000 Düsseldorf Walzwerk zum herstellen nahtloser rohre
FR2198797B1 (fr) * 1972-09-08 1975-01-03 Vallourec
JPS5913284B2 (ja) * 1977-11-08 1984-03-28 新日本製鐵株式会社 管材の穿孔圧延法
DE3231071C2 (de) * 1982-08-18 1987-01-15 Mannesmann AG, 4000 Düsseldorf Einlaufseite einer mit gesteuerter Dornstangengeschwindigkeit arbeitenden Rohrkontistraße
JP5011770B2 (ja) * 2006-03-22 2012-08-29 住友金属工業株式会社 マルテンサイト系ステンレス鋼管の製造方法
DE102008039454B4 (de) * 2008-08-25 2011-01-27 Sms Meer Gmbh Verfahren zur Herstellung eines nahtlosen Stahlrohres und Walzwerk zur Durchführung des Verfahrens
DE102013002268B4 (de) * 2013-02-12 2018-04-05 Sms Group Gmbh Walzanlage bzw. -verfahren

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2016016751A1 *

Also Published As

Publication number Publication date
RU2017106031A (ru) 2018-08-28
RU2017106031A3 (fr) 2018-12-10
CN106660087A (zh) 2017-05-10
AR101373A1 (es) 2016-12-14
JP2017522191A (ja) 2017-08-10
WO2016016751A1 (fr) 2016-02-04
US20170165729A1 (en) 2017-06-15

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