EP2554293A1 - Procédé de forgeage de tuyau avec bloc creux moulé - Google Patents

Procédé de forgeage de tuyau avec bloc creux moulé Download PDF

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Publication number
EP2554293A1
EP2554293A1 EP12005323A EP12005323A EP2554293A1 EP 2554293 A1 EP2554293 A1 EP 2554293A1 EP 12005323 A EP12005323 A EP 12005323A EP 12005323 A EP12005323 A EP 12005323A EP 2554293 A1 EP2554293 A1 EP 2554293A1
Authority
EP
European Patent Office
Prior art keywords
billet
forging
coating
hollow block
mandrel
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Withdrawn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
EP12005323A
Other languages
German (de)
English (en)
Inventor
Ulrich Vohskämper
Paul Dr. Nieschwitz
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 EP2554293A1 publication Critical patent/EP2554293A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/002—Hybrid process, e.g. forging following casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
    • B21J7/02—Special design or construction
    • B21J7/14—Forging machines working with several hammers

Definitions

  • the invention relates to a method for forging a pipe according to the preamble of claim 1.
  • EP 1 814 679 A1 describes a method for producing a seamless hot-finished steel tube, in which a heated to a forming temperature block is formed by punching in a hollow block in a first forming step, wherein subsequently a finished tube is produced in the same heat in a second forming step by radial forging.
  • the hollow block with the central recess By producing the hollow block with the central recess by a primary molding method, the hollow block is provided in a particularly simple and effective manner. In accordance with the principle of a primary forming, the block and the central recess required for forging the hollow block into a tube are formed in the same forming step, so that the outlay on the preparation of the hollow block is reduced.
  • the invention relates to pipes made of an iron-based alloy, in particular steel, or even a nickel-based alloy or a titanium alloy.
  • step a1 comprises an electroslag remelting process.
  • this provides an effective and universal method for the primary shaping of the hollow block.
  • the primary molding process may also include a centrifugal casting process.
  • the centrifugal casting is particularly suitable for combination with a radial forging method, since a hollow block is already regularly produced with a central recess.
  • this may include the removal of a casting skin. It can be z. B. also to a homogenization of the recess, a deburring or any other suitable pre-treatment of the urgeformten hollow block prior to introduction into a radial forging device.
  • a heating of the hollow block after step a1 and before step b in a step a3 in order to achieve a defined forming temperature for the radial forging process may be particularly advantageous in alloys and structures that have a relatively narrow temperature range for forging machining.
  • step a1 and step b it may be particularly advantageous to save energy and costs that between step a1 and step b no intermediate heating of the hollow block is made.
  • the existing at the Urformung regularly very high heat is used to obtain a temperature that is suitable for radial forging.
  • a controlled cooling of the urgeformten hollow block before being introduced into the radial forging is particularly advantageous.
  • the desorbed hollow block is descaled before step b, preferably, but not necessarily, by a high-pressure process.
  • a lubricant may preferably be formed on the basis of glass and / or phosphate and / or graphite.
  • the step b of forging the hollow block into a tube while reducing an outer diameter and a wall thickness of the hollow block is generally advantageously carried out by means of a forging mandrel as an internal tool.
  • a forging mandrel as an internal tool.
  • open-die forging without a forging mandrel is conceivable, but the use of a forging mandrel is particularly effective.
  • the forging process will take place in such a way that the wall of the hollow block is pressed by external forging jaws against the forging mandrel arranged internally in the recess in order to effect the forming in the manner of a forging.
  • the forging jaws can in particular be hydraulically driven, as a result of which a very controlled pressure curve is regularly achieved on the workpiece.
  • another drive mechanism of the forging jaws may be provided, for. B. by falling weights or the like.
  • the forging mandrel has a coating which particularly preferred, but not necessary, has a Zunderbe harshung, a ceramic coating and / or a coating with a metal alloy applied.
  • These coatings can be submitted individually or in combination.
  • a coated metal alloy and / or hard alloy as a coating such coatings are to be understood, which incorporated in the metal alloy and / or hard alloy hard materials, in particular ceramic nature, such as. As tungsten carbide or the like, have.
  • Such coatings are often made by a thermal process such as plasma deposition welding, arc surfacing, or the like.
  • the metal alloy serves to provide a sufficiently tough matrix which on the one hand provides a good and non-peeling connection with a substrate of the forging mandrel, in particular steel, and on the other hand achieves a correspondingly high hardness of the outwardly acting surface due to integrated hard material phases and / or hard material particles.
  • a main body of the forging mandrel has a surface profiling, wherein the coating is applied to the surface profiling.
  • the profiling can be adapted to the shape and orientation particularly to the respective mechanical loads, z. B. to the forces caused by the respective forging jaws forces.
  • the surface profilings form at least one undercut in an axial direction of the forging mandrel.
  • a good fit is provided, which can also absorb very high forces acting in the direction of detachment of the coating.
  • the surface profiling has a number of elevations and depressions on the surface of the base body.
  • the main body of a forging mandrel for use in a method according to the invention is preferably made of steel.
  • the coating of the forging mandrel protects advantageous against both thermal and mechanical loads.
  • the coating may have a targeted thermal conductivity to reduce a thermal effect on the body.
  • the coating can be applied by a thermo-chemical coating process.
  • internal cooling may additionally be provided, wherein the mandrel can be wetted with a coolant if required.
  • the hollow block 104 is produced together with its recess 104a in a primary molding process.
  • This is preferably a centrifugal casting process or a remelting process, for example an electroslag remelting process.
  • a mechanical reworking of the hollow block takes place. This may be, for example, a descaling and / or a post-processing of the recess for fine adjustment to a size and shape required for forging.
  • Fig. 7 shows by way of example a device for radial forging 101, at which the method can be performed.
  • the block 104 is held in the end in a manipulator or holder 102.
  • a hot tool in the form of a forging mandrel 1 is inserted into the recess 104a.
  • the forging jaws 103 are preferably pressed by means of hydraulic drives with a defined pressure curve against the hollow block 104 in order to achieve a radially acting forging of the hollow block 104 to a tube.
  • striking the forging jaws eg via a cam mechanism, can be provided.
  • the hollow block 104 can be rotated and / or axially displaced by means of the manipulator 102.
  • Fig. 1 the mandrel or the hot tool 1 in the form of a mandrel for the production of a seamless tube is shown schematically.
  • the shape may vary depending on requirements and in particular be cylindrical or slightly conical.
  • the tool 1 has a tool base body 2, which has a working area 3, which extends over a certain length in the direction of an axis a. In the working area 3, the tool 1 is provided with a coating 4 which protects the tool 1 against thermal or mechanical stress.
  • Fig. 1 Tool body 2 shown in the context of the present invention is an interchangeable mandrel tip, for example, releasably on a mandrel body, for example in the form of a shaft 105 (see Fig. 7 ) of the radial forging mandrel 1 can be placed.
  • a replaceable mandrel tip 2 and a mandrel body 105 are possible depending on the requirements.
  • FIGS. 2 and 3 The exact structure of the tool as a detail in the "Z" according to Fig. 1 , ie as a section of the tool base body 2 is in the FIGS. 2 and 3 shown.
  • the elevations 6 extend in the axial direction a by an amount B, which is preferably in the range of about 250 microns to 4000 microns.
  • the height D of the elevations 6 with respect to the recesses 7 is in a range of about 500 microns to 5000 microns.
  • the distance A between two elevations 7 is preferably in a range of about 200 microns to 2,000 microns.
  • the profiling 5 is applied to the surface of the base body 2, that this is first processed smoothly and then incorporated by machining the ridge-shaped or rectangular recesses 7 in the radial section, in particular screwed, are.
  • the surface of the tool base 2 is provided with a coating 4, as shown in FIG Fig. 3 is shown.
  • the total layer thickness C of the coating 4 fills out the recesses 7 and exceeds the height of the elevations 6.
  • Fig. 4 is a preferred embodiment or to see solution.
  • the pre-processing of the tool base body 2 is analogous to the solution according to Fig. 2 and Fig.3 made, ie it was first introduced the surface profiling 5 in the smooth machined tool body 2.
  • the profile of the profiling corresponds to that according to Fig. 2 ,
  • a portion of the material of the base body 2 was first converted into a protective layer by using a thermo-chemical treatment process.
  • the converted material 8 is equidistant from the profiling 5 and is indicated by dashed lines. This reduces accordingly the width of the elevations (webs) 6 and the depth of the cross-section in turn rectangular gaps, as it Fig. 4 shows.
  • the representations in the FIGS. 5 and 6 Examples of specific coatings can be found.
  • the inner, more porous layer 8 and the second outer layer 4 applied thereon by conversion of the webs (elevations) 6 and filling in of gaps (depressions) 7 can be clearly seen.
  • the inner layer 8 (converted material) consists in the present case of iron oxides and grows from the surface of the main body or the profiling.
  • the gaps between the lands (bumps) are filled by the outer coating 4 (up).
  • the carrier material (tool base) was coated with iron oxides or material of the main body was converted into iron oxide.
  • the carrier material is present steel.
  • the maximum thickness of the coating on the base body is in this example about 1,000 microns.
  • the structured transition between the carrier material and the coating can be optimized depending on the application, so that complete peeling of the layer during use can be prevented. As a result, in particular the service life of the tool 1 can be substantially increased.
  • the surfaces of the coated tools, before or during use by mechanical processing eg. B. grinding and polishing (before use) or rolling (during use), smoothed.
  • the smoothing of the surface reduces the friction between the tool and the workpiece (rolling stock).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP12005323A 2011-07-30 2012-07-20 Procédé de forgeage de tuyau avec bloc creux moulé Withdrawn EP2554293A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011109071A DE102011109071A1 (de) 2011-07-30 2011-07-30 Rohrschmiedeverfahren mit urgeformten Hohlblock

Publications (1)

Publication Number Publication Date
EP2554293A1 true EP2554293A1 (fr) 2013-02-06

Family

ID=46633976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12005323A Withdrawn EP2554293A1 (fr) 2011-07-30 2012-07-20 Procédé de forgeage de tuyau avec bloc creux moulé

Country Status (4)

Country Link
US (1) US20130025338A1 (fr)
EP (1) EP2554293A1 (fr)
CN (1) CN102896265A (fr)
DE (1) DE102011109071A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015091409A1 (fr) * 2013-12-17 2015-06-25 Koninklijke Philips N.V. Système et instrument pour délivrer un objet et procédé de détection de délivrance
DE102014000461B4 (de) * 2014-01-14 2017-01-05 Hua Guo Innenwerkzeug für die Herstellung nahtloser Stahlrohre
CN108472712A (zh) * 2016-01-14 2018-08-31 奥科宁克公司 用于生产锻造产品和其它加工产品的方法
CN107282838A (zh) * 2017-07-17 2017-10-24 中原特钢股份有限公司 利用径锻机锻造小规格空心管的生产方法
CN114178452B (zh) * 2021-12-08 2022-09-02 四川大学 一种无缝钢管径向锻造设备及其锻造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1814679A1 (fr) 2004-10-25 2007-08-08 V & M Deutschland GmbH Procede pour produire un tube d'acier sans soudure usine a chaud et dispositif pour realiser le procede
CN101722262A (zh) * 2009-11-23 2010-06-09 北京首宏钢科技开发有限公司 一种利用径向锻造技术生产中大口径合金钢无缝管材的新方法
DE102010012717A1 (de) * 2010-03-25 2010-12-16 Daimler Ag Verfahren zur Herstellung einer Hohlwelle

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US3259975A (en) * 1963-12-19 1966-07-12 Combustion Eng Tube manufacture
DE1960328C3 (de) * 1969-12-02 1974-04-11 Friedrich Dr.-Ing. 4000 Duesseldorf Kocks Verfahren und Walzwerksanlage zum Auswalzen einer Rohrluppe
JPH02224806A (ja) * 1989-02-28 1990-09-06 Nkk Corp 継目無し鋼管製造用プラグ
JPH115137A (ja) * 1997-06-11 1999-01-12 Aichi Steel Works Ltd 中空軸を有する鍛造品の製造方法
CN100444989C (zh) * 1997-10-22 2008-12-24 中国科学院金属研究所 高合金无缝变形管材加工方法
AT413195B (de) * 2000-10-24 2005-12-15 Boehler Edelstahl Verfahren zur herstellung zylindrischer hohlkörper und verwendung derselben
AT501152B8 (de) * 2003-12-30 2007-02-15 Gfm Beteiligungs & Man Gmbh Verfahren und vorrichtung zum herstellen eines zylindrischen hohlkörpers aus einem rohling
DE102004057682B4 (de) * 2004-11-29 2007-11-15 Daume Regelarmaturen Gmbh Verfahren zur Herstellung eines drucktragenden Bauteils
BRPI0607951A2 (pt) * 2005-02-17 2009-10-27 Sumitomo Metal Ind tubo metálico e método de fabricação do mesmo
EP1884296B1 (fr) * 2005-05-27 2011-09-21 Sumitomo Metal Industries, Ltd. Procede de fabrication de tube metallique a paroi ultra mince par procede d'usinage a froid
FR2904635B1 (fr) * 2006-08-03 2008-10-31 Aubert & Duval Soc Par Actions Procede de fabrication d'ebauches en acier
US8968495B2 (en) * 2007-03-23 2015-03-03 Dayton Progress Corporation Methods of thermo-mechanically processing tool steel and tools made from thermo-mechanically processed tool steels
DE102009052482A1 (de) * 2009-02-11 2010-08-19 Sms Meer Gmbh Verfahren und Vorrichtung zur Herstellung von rohrförmigen Werkstücken aus einen vorgelochten Hohlblock
CN101706019B (zh) * 2009-12-10 2011-04-27 内蒙古北方重工业集团有限公司 垂直挤压大口径厚壁无缝钢管制造方法
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Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1814679A1 (fr) 2004-10-25 2007-08-08 V & M Deutschland GmbH Procede pour produire un tube d'acier sans soudure usine a chaud et dispositif pour realiser le procede
CN101722262A (zh) * 2009-11-23 2010-06-09 北京首宏钢科技开发有限公司 一种利用径向锻造技术生产中大口径合金钢无缝管材的新方法
DE102010012717A1 (de) * 2010-03-25 2010-12-16 Daimler Ag Verfahren zur Herstellung einer Hohlwelle

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Title
DATABASE EPODOC [online] EUROPEAN PATENT OFFICE, THE HAGUE, NL; 9 June 2010 (2010-06-09), Database accession no. CN101722262 *

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Publication number Publication date
US20130025338A1 (en) 2013-01-31
CN102896265A (zh) 2013-01-30
DE102011109071A1 (de) 2013-01-31

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