EP0356743A2 - Barre de mandrin pour laminoir de tubes - Google Patents

Barre de mandrin pour laminoir de tubes Download PDF

Info

Publication number
EP0356743A2
EP0356743A2 EP89114240A EP89114240A EP0356743A2 EP 0356743 A2 EP0356743 A2 EP 0356743A2 EP 89114240 A EP89114240 A EP 89114240A EP 89114240 A EP89114240 A EP 89114240A EP 0356743 A2 EP0356743 A2 EP 0356743A2
Authority
EP
European Patent Office
Prior art keywords
tube
mandrel bar
tubes
mandrel
transmission means
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Withdrawn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
EP89114240A
Other languages
German (de)
English (en)
Other versions
EP0356743A3 (fr
Inventor
Francis Dr. Fischer
Jean-Paul Calmes
Alain Dr. Cron
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.)
Lonza AG
Original Assignee
Lonza 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 Lonza AG filed Critical Lonza AG
Publication of EP0356743A2 publication Critical patent/EP0356743A2/fr
Publication of EP0356743A3 publication Critical patent/EP0356743A3/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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

Definitions

  • Mandrel bars of this type are used for the hot rolling of pipes, in particular in the so-called MPM (multiple pipe mill) process, as well as in the push bench process and in continuous pipe rolling mills (so-called Conti lines), the slug being rolled on the mandrel bar.
  • a slug is understood to mean the hollow cylindrical intermediate product in tube production).
  • the rod head can be rounded or provided with a plug of the same diameter.
  • the wall of the blank is rolled out by a plurality of horizontally and vertically opposed pairs of rollers pressing the blank against the mandrel bar.
  • the mandrel rod that moves with the billet is located within the entire rolling process and is warmed up by its temperature and the rolling work. After the rolling process, it is pulled out of the billet and stored for cooling. Another already cooled mandrel bar is used for the next rolling process.
  • the force transmission means can also consist of thermally insulating, elastic material, so that none or only a negligible one Heat quantity is transferred from the outer to the inner tube (or the inner tubes).
  • the inner tube remains at a constant temperature and acts as a mechanical stabilizing element for the entire mandrel bar.
  • the outer tube preferably has an increased surface hardness and quality compared to the inner tube or tubes. Its wall thickness is appropriately chosen so large that the temperature on its inner surface always remains a sufficient tolerance below the decomposition temperature (glass transition temperature) of the thermoset serving as a force transmission means.
  • the inner or innermost tube can be closed at the front and open at the rear, and for cooling a coolant line can be guided through the tube cavity, through which the coolant is guided to the front end of the inner tube and from there flows backwards with cooling of the inner tube wall.
  • cooling channels are located in the space between the tubes.
  • thin cooling tubes can be inserted into the space and then filled with a thermoset.
  • the annular gap 4 has a width of a few millimeters and, as already explained above, is completely filled with a thermosetting plastic which adheres firmly to both the inner surface of the outer tube 2 and the outer surface of the inner tube 3.
  • a thermosetting plastic which adheres firmly to both the inner surface of the outer tube 2 and the outer surface of the inner tube 3.
  • an epoxy resin to which inorganic fibers or a metal powder is optionally admixed, is preferably used.
  • the outer and inner tubes 2 and 3 can be coaxially vertically nested and the intermediate annular gap 4 can be sealed liquid-tight at its lower end.
  • the annular gap 4 is then filled with the thermoset, to which an additive is optionally added.
  • the filling process can be performed by e.g. B. casting or by extrusion. After the thermoset has hardened and the cooling tube 9 has been inserted, the mandrel rod 1 is ready for use.
  • the temperature on the outside of the outer tube 2 varies by a few hundred degrees Celsius (approximately between seven and eight hundred and eighty degrees) and the temperature on the inside depending on the wall thickness and rolling time (a few seconds) ) by a little more than two hundred degrees (approximately between two hundred to three hundred and fifty and eighty degrees).
  • the temperature of the inner tube 3 is due to the low thermal conductivity of the thermoset and the width of the annular gap 4 approximately constant from a few millimeters (at about eighty to one hundred and fifty degrees).
  • the mandrel bar 1 according to the invention behaves significantly more stable against distortion than a solid mandrel bar of a conventional type. This effect should be attributable to the fact that in the mandrel bar 1 according to the invention the inner tube 3, due to the thermal insulation by the thermoset layer, is almost temperature-stable during the entire rolling and subsequent cooling storage cycle is maintained.
  • the outer tube 2 is homogeneous due to its type of manufacture and thus largely free of distortion, should non-uniform cooling or heating occur, any distortion forces of the outer tube 2 are eliminated by the stable inner tube 3. With a conventional mandrel bar, however, there would be a strong warp under the same circumstances.
  • the rolling forces on the mandrel bar 1, as already shown above, are absorbed by the outer and inner tubes 2 and 3.
  • a single tube, apart from the risk of warping, cannot be used because it cannot be produced by rolling with the required wall thickness.
  • the use of tubes made by rolling for the mandrel bar 1 has the advantage that they can be manufactured inexpensively in the required homogeneity and surface quality.
  • cooling tube 9 instead of the cooling tube 9 within the tube 3, several thin tubes can also be embedded in the thermosetting plastic for cooling.
  • the surface of the inner tube can be designed by glued-on or welded webs in such a way that cavities that can be used for a cooling circuit result when inserted into the outer tube 2 and then poured out.
  • the annular space 4 can also be filled with a liquid.
  • the tubes can be supported against each other by resilient webs and the annular space can be sealed liquid-tight on its two end faces.
  • a pressure vessel can be connected to the annulus. The spring forces are then to be chosen at least so large that they bear the weight of the respective pipes. The power transmission during rolling takes place via the liquid.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Heat Treatment Of Articles (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Metal Rolling (AREA)
EP19890114240 1988-08-31 1989-08-02 Barre de mandrin pour laminoir de tubes Withdrawn EP0356743A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3254/88 1988-08-31
CH3254/88A CH679462A5 (fr) 1988-08-31 1988-08-31

Publications (2)

Publication Number Publication Date
EP0356743A2 true EP0356743A2 (fr) 1990-03-07
EP0356743A3 EP0356743A3 (fr) 1991-03-27

Family

ID=4251996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890114240 Withdrawn EP0356743A3 (fr) 1988-08-31 1989-08-02 Barre de mandrin pour laminoir de tubes

Country Status (6)

Country Link
US (1) US4956988A (fr)
EP (1) EP0356743A3 (fr)
JP (1) JPH02104406A (fr)
CN (1) CN1040747A (fr)
BR (1) BR8904379A (fr)
CH (1) CH679462A5 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103801558A (zh) * 2014-01-27 2014-05-21 胜利油田康贝石油工程装备有限公司 石油用割缝管的梯型缝加工方法和设备

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5186035A (en) * 1992-02-18 1993-02-16 General Electric Company Tube loading sleeve for pilger mill
US8161786B2 (en) * 2008-04-15 2012-04-24 Glen Stapleton Apparatus for feeding and turning tube products into a pilger mill machine
CN104138914B (zh) * 2014-07-29 2016-10-26 湖北新冶钢特种钢管有限公司 一种顶管机固定扣瓦

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1989507A (en) * 1933-05-03 1935-01-29 Diescher Tube Mills Inc Rolling mill mandrel
US2025439A (en) * 1933-05-20 1935-12-24 Brownstein Benjamin Mandrel bar for continuous tube rolling mills
FR822733A (fr) * 1936-06-11 1938-01-06 Witkowitzer Bergb Gewerkschaft Procédé de laminage des tubes dit: au pas de pèlerin
FR1096089A (fr) * 1953-03-24 1955-06-08 Perfectionnements dans les mandrins de laminage à refroidissement intérieur et dans les dispositions d'adduction à ces mandrins du fluide réfrigérant
NL130355C (fr) * 1964-09-09
US3541831A (en) * 1967-04-07 1970-11-24 Int Nickel Co Extrusion mandrel
US3918284A (en) * 1973-04-20 1975-11-11 Youngstown Sheet And Tube Co Seamless tube mill piercer mandrel and assembly
SU719720A1 (ru) * 1978-01-02 1980-03-10 Московский Ордена Трудового Красного Знамени Институт Стали И Сплавов Составной дорн дл пилигримовой прокатки труб
JPS55103200A (en) * 1979-01-31 1980-08-07 Nippon Kokan Kk <Nkk> Manufacturing method of external bottom plate for double-walled low temperature tank
JPS5856648B2 (ja) * 1979-01-31 1983-12-16 新日本製鐵株式会社 管の連続圧延法
DE3429524A1 (de) * 1984-08-10 1986-02-20 Kocks Technik Gmbh & Co, 4010 Hilden Dornstange oder stopfen fuer eine walzstrasse zum herstellen nahtloser rohre
US4819471A (en) * 1986-10-31 1989-04-11 Westinghouse Electric Corp. Pilger die for tubing production

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103801558A (zh) * 2014-01-27 2014-05-21 胜利油田康贝石油工程装备有限公司 石油用割缝管的梯型缝加工方法和设备
CN103801558B (zh) * 2014-01-27 2015-12-30 胜利油田康贝石油工程装备有限公司 石油用割缝管的梯型缝加工方法和设备

Also Published As

Publication number Publication date
CN1040747A (zh) 1990-03-28
EP0356743A3 (fr) 1991-03-27
JPH02104406A (ja) 1990-04-17
BR8904379A (pt) 1990-04-17
US4956988A (en) 1990-09-18
CH679462A5 (fr) 1992-02-28

Similar Documents

Publication Publication Date Title
DE4227495A1 (de) Drehanoden-Röntgenröhre mit Kühlvorrichtung
DE3838726A1 (de) Heiz- oder kuehlwalze
DE3925517C2 (de) Glätteinrichtung eines Auftragswerkes
DE3783187T2 (de) Kuehlrollen zum giessen von schnell erstarrenden metallblechen.
DE3424276A1 (de) Verfahren zur herstellung rohrfoermiger giessformen
EP0356743A2 (fr) Barre de mandrin pour laminoir de tubes
DE2552969A1 (de) Fuehrungsrolle fuer stranggussanlagen, mit auf einer mehrfach gelagerten achse angeordneten rollenabschnitten
DE69701158T2 (de) Giesswalze zum kontinuierlichen Giessen von Metall zwischen oder auf die Giesswalzen
EP0062209B1 (fr) Installation pour refroidir des barres en acier
DE3530343C2 (fr)
DE3427707C2 (de) Innengekühlte Rolle
DE2600502A1 (de) Walze fuer eine metall-stranggiessanlage
DE2854311C3 (de) Gießnut für eine Gießrad-Stranggießkokille
DE1960546A1 (de) Elektrischer Leiter mit Kuehlkanal
DE2420014A1 (de) Verfahren zur herstellung von zuegen oder riefen in der innenflaeche von koerpern mit gerader oder gebogener mantellinie waehrend einer verformung durch abstreckdruekken, sowie vorrichtung zur durchfuehrung dieses verfahrens
DE3012736C2 (de) Stranggießrolle
DE3429524A1 (de) Dornstange oder stopfen fuer eine walzstrasse zum herstellen nahtloser rohre
DE102016116869A1 (de) Ofenrolle
DE1652533A1 (de) Einrichtung zur Steuerung des Walzspaltes bei Walzwerken
DE69425960T2 (de) Kühlwalze zum kontinuierlichen Giessen und deren Herstellung
DE2365682A1 (de) Geraet zum hochfrequenzschweissen von metall oder metallen
DE2552483C2 (de) Führungsrolle für Stranggießanlagen, mit mehreren auf einer Achse gelagerten Rollenkörpern
DE2940008C2 (fr)
DE1602380A1 (de) Spreizbarer Wickeldorn
DE917846C (de) Kuehler zur beschleunigten Kuehlung geschweisster Metallrohre

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): BE CH DE ES FR GB IT LI NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): BE CH DE ES FR GB IT LI NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19910928