EP2991780B1 - Lochdorn mit verbesserter standzeit zur herstellung nahtloser rohre - Google Patents

Lochdorn mit verbesserter standzeit zur herstellung nahtloser rohre Download PDF

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Publication number
EP2991780B1
EP2991780B1 EP14772318.3A EP14772318A EP2991780B1 EP 2991780 B1 EP2991780 B1 EP 2991780B1 EP 14772318 A EP14772318 A EP 14772318A EP 2991780 B1 EP2991780 B1 EP 2991780B1
Authority
EP
European Patent Office
Prior art keywords
piercing mandrel
nose
mandrel
piercing
main body
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.)
Active
Application number
EP14772318.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2991780A1 (de
Inventor
Winfried Braun
Christian Klempel
Rene Baadjou
Rolf Kümmerling
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.)
Vallourec Deutschland GmbH
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Vallourec Deutschland GmbH
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Publication date
Application filed by Vallourec Deutschland GmbH filed Critical Vallourec Deutschland GmbH
Publication of EP2991780A1 publication Critical patent/EP2991780A1/de
Application granted granted Critical
Publication of EP2991780B1 publication Critical patent/EP2991780B1/de
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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

  • the invention relates to a piercer for punching heated round blocks made of metal for the production of seamless tubes, comprising a piercing lug nose and a perforated mandrel body, which is connectable to a mandrel.
  • the usually consisting of a high-temperature tool steel piercer has in addition to the actual punching the task of any material tears to re-weld, to smooth the inner surface of the resulting hollow block and to bring its wall thickness as uniform as possible to the desired level.
  • tube materials such as chromium-containing materials, with more than 5 wt.% Chromium
  • the thermic and mechanical stress particularly the mandrel and in particular the mandrel tip so that it has wear traces already after a few holes, which quickly leads to defective changes in geometry of the dome and thus lead to internal errors and geometry deviations on the hollow block.
  • the piercer tip consists of a cylindrical portion and a hemispherical tip, wherein the outlet openings are arranged in the transition region between the cylindrical portion and piercer main body.
  • a disadvantage is the still insufficient cooling of the piercer tip itself and the oblique position of the outlet openings for the coolant at the piercer tip, on the one hand consuming to produce, on the other hand, a closure during the piercing process by contacting with the material of the round block not yet reliably prevented.
  • Another disadvantage is the one-piece design of the piercer, which requires a replacement of the complete piercer when worn.
  • EP 1 961 497 B1 another piercer of a piercing mill known.
  • This piercer shows a piercer nose on a piercer body.
  • the piercer nose widens conically in the direction of the perforated mandrel main body.
  • the invention is based on the object, the service life of the piercer when punching round blocks of metal, in particular of higher alloyed, difficult to deform Steel materials, by means of oblique rolling, taking into account a qualitative improvement of the inner surface of the perforated round block and to reduce tooling costs to increase.
  • a piercer comprising a piercer nose and a perforated mandrel body, which is connectable to a mandrel, which is characterized in that the piercer nose is formed conically tapering in the longitudinal extent to the piercing mandrel main body in the outer diameter.
  • the perforated-mandrel nose is formed from a nose core connected to the perforated-mandrel main body and a nose-cap connected over and detachably connected to the nose-core. Due to the detachable connection of nose cap and nose core a simple and cost-effective replacement is realized in case of wear, because not the complete piercer or the lug nose with the consuming introduceddeffenzuhne- and drain lines but only the most affected by wear, easy to produce nose cap must be replaced ,
  • the mandrel nose for cooling the mandrel nose or the nose core for cooling the nose cap and for lubricating the piercer to a leading through the perforated mandrel main body to the mandrel nose or the nose core supply line for cooling lubricant and at least one through the mandrel nose or the nose core the coolant is connected back again leading drain line and arranged at the end of the drain line in the transition region of piercer nose and piercer main body an outlet for the cooling lubricant from the piercer.
  • the length L of the mandrel nose or the nose cap is determined depending on the block diameter DB to be rolled and the nose diameter DN at the nose-side end of the mandrel nose or the nose cap, such that the condition 0.10 ⁇ DB ⁇ L ⁇ 3 ⁇ DN is satisfied.
  • Compliance with this condition is necessary in order to have a minimum volume and a minimum cross section for the mandrel nose or the nose cap available, since the cooling of the cap according to the invention can not completely prevent a warming of this.
  • the radius at the nose-side end of the mandrel nose or the nose cap should advantageously have a value of r ⁇ 3.0 mm in order to avoid load peaks at this transition and thus premature wear.
  • the necessary for the reverse conical design of the lug nose or the nose cap angle ⁇ should be between 2 ° and 10 ° to form a sufficiently large gusset and thus to achieve the effect of increasing the service life of the piercing pin according to the invention.
  • the inflow line of the cooling lubricant preferably extends centrally through the piercer to the front end of the nose core.
  • the preferably several outflow lines through the nose core lead up to the outlet opening from the piercer in the transition region of mandrel nose and mandrel body and are preferably arranged radially around the inflow line.
  • four, six or eight drain lines may be arranged in the nose core.
  • the nose core is detachably connected to the mandrel main body, so that if necessary, only the mandrel body needs to be replaced and not in addition the nose core, with channels for cooling lubricant inflow and outflow.
  • connection of nose core and mandrel body can be made according to the invention either by means of a screw or for easier mounting and dismounting, advantageously by means of a bayonet closure.
  • lug nose and body can also consist of different materials, which take into account the different stresses during punching.
  • FIG. 1 schematically a cone slanting mill is shown, which transforms a solid block of steel by means of a piercing mandrel according to the invention to form a hollow block pipe.
  • the cone slanting mill 1 consists of two work rolls 2, 2 ', which transform the solid block 3 into a hollow block pipe 6 via an internal tool consisting of a piercer 4 according to the invention and a mandrel bar 5. In reverse direction of the work rolls 2, 2 'of the block 3 and the hollow block tube 6 is moved helically over the axially fixed inner tool.
  • the perforated mandrel 4 consists of a perforated mandrel main body 4.1 to which a mandrel nose 4.2 is connected.
  • the diameter of the perforated mandrel main body 4.1 increases continuously starting from the nose-side end up to a maximum value which determines the inner diameter of the hollow block tube 6.
  • the mandrel nose 4.2 has a conically tapering diameter to the perforated mandrel main body 4.1, with a gusset 7 forming in the transition region between mandrel main body 4.1 and piercer nose 4.2 to the resulting hollow block tube 6, which does not come into contact with the material of the hollow block tube 6 during piercing.
  • FIG. 2 shows geometric details of the piercer 4 according to the invention in an enlarged schematic representation.
  • the mandrel nose 4.2 is conically tapered towards the piercer main body 4.1, wherein an angle ⁇ between 2 ° and 10 ° is maintained.
  • the angle ⁇ is enclosed between the outer surface of the piercer nose 4.2 and an imaginary straight line which runs parallel to a longitudinal axis of the piercer 4 and the outer surface of the piercer nose 4.2 is tangent in the region of its largest diameter DN.
  • the piercer nose 4.2 has a length L which depends on the diameter of the block 3 to be punched (DB) and the largest diameter of the mandrel nose 4.2 (DN), the condition 0.10 x DB ⁇ L ⁇ 3 x DN being maintained , Furthermore, the mandrel nose 4.2 at the front end has a radius r, which is at least 3 mm.
  • FIG. 3 shows schematically the formation of the piercer nose 4.2 in a longitudinal section (left part of the picture) and in a cross section (right part of the picture).
  • perforated mandrel body 4.1 and mandrel nose 4.2 are shown in a one-piece, so not releasable design because of the simpler presentation.
  • the following description can be analogously transferred to a detachable version.
  • the piercer nose 4.2 consists of a nose core 4.2a and a nose cap 4.2b mounted thereon.
  • an axial distance "x" between the front end of the nose core 4.2a and the inside of the nose cap 4.2b is provided.
  • the connection is designed as a conical seat 10, wherein the nose cap 4.2b and nose core 4.2a are clamped to one another via the axial pressure exerted on the nose cap 4.2b during punching.
  • the inflow line of the cooling lubricant 8 to the nose cap 4.2b extends centrally through the piercer 4 to the front end of the nose core 4.2a.
  • the inflow line of the cooling lubricant 8 to the nose cap 4.2b extends centrally through the piercer 4 to the front end of the nose core 4.2a.
  • Pass drain lines 9 which extend up to the annular gap formed as the outlet opening 11 in the transition region of piercer nose 4.2 and mandrel body 4.1.
  • FIG. 3 shown cross-section through the mandrel nose 4.2 are four radially around the supply line 8 circularly arranged drain lines 9 can be seen.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Earth Drilling (AREA)
  • Punching Or Piercing (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Drilling Tools (AREA)
  • Forging (AREA)
EP14772318.3A 2013-09-27 2014-09-22 Lochdorn mit verbesserter standzeit zur herstellung nahtloser rohre Active EP2991780B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013110725.7A DE102013110725B3 (de) 2013-09-27 2013-09-27 Lochdorn mit verbesserter Standzeit zur Herstellung nahtloser Rohre
PCT/EP2014/070153 WO2015044094A1 (de) 2013-09-27 2014-09-22 Lochdorn mit verbesserter standzeit zur herstellung nahtloser rohre

Publications (2)

Publication Number Publication Date
EP2991780A1 EP2991780A1 (de) 2016-03-09
EP2991780B1 true EP2991780B1 (de) 2017-04-12

Family

ID=51619160

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14772318.3A Active EP2991780B1 (de) 2013-09-27 2014-09-22 Lochdorn mit verbesserter standzeit zur herstellung nahtloser rohre

Country Status (12)

Country Link
US (1) US9937540B2 (pl)
EP (1) EP2991780B1 (pl)
JP (1) JP6397032B2 (pl)
CN (1) CN105377459B (pl)
AR (1) AR097774A1 (pl)
DE (1) DE102013110725B3 (pl)
EA (1) EA030534B1 (pl)
ES (1) ES2628728T3 (pl)
MX (1) MX370022B (pl)
PL (1) PL2991780T3 (pl)
UA (1) UA116475C2 (pl)
WO (1) WO2015044094A1 (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023073011A1 (en) 2021-10-28 2023-05-04 Vallourec Deutschland Gmbh Piercing mandrel having a piercing mandrel lug for the production of seamless tubes

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7493161B2 (ja) * 2019-12-27 2024-05-31 Ｊｆｅスチール株式会社 継目無鋼管製造用プラグ、継目無鋼管製造用ピアッシングミルおよび継目無鋼管の製造方法
CN115780512A (zh) * 2022-12-07 2023-03-14 安徽东耘智能设备制造有限责任公司 轧制机构、斜轧机及铝合金棒材的超细晶轧制方法

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE21957E (en) * 1941-11-25 Means for cooling piercing points of
US1374369A (en) * 1919-03-29 1921-04-12 Luther D Earl Tool for piercing billets
GB266918A (en) * 1926-03-19 1927-03-10 Norman Cecil Joseph Improvements in and relating to the spinning of metal hollow-ware
US2197098A (en) * 1936-12-07 1940-04-16 Nat Tube Co Mandrel
US2261937A (en) * 1939-07-22 1941-11-11 Nat Tube Co Means for cooling piercing points of tube rolling mills
IT1110926B (it) * 1979-02-07 1986-01-13 Innocenti Santeustacchio Spa Metodo ed apparecchiatura per il controllo del movimento del mandrino in un laminatoio continuo a mandrino trattenuto
DE2945620A1 (de) * 1979-11-12 1981-06-11 Solomon Aba-Šojlevič Šajkevič Verfahren zum ziehen von rohren und selbsteinstellender ziehdorn fuer die durchfuehrung dieses verfahrens
JPS5913924B2 (ja) * 1979-12-25 1984-04-02 日本鋼管株式会社 穿孔圧延機用芯金
US4370879A (en) * 1980-08-26 1983-02-01 Kopysky Boris D Method for manufacturing a piercing mandrel
US4406143A (en) * 1981-12-23 1983-09-27 United States Steel Corporation Return pass practice for the high mill of a seamless-pipe mill
JPH0337770Y2 (pl) * 1985-03-30 1991-08-09
JPH03204106A (ja) * 1989-12-28 1991-09-05 Sumitomo Metal Ind Ltd 熱間継目無管製造用プラグ
DE4112614C2 (de) * 1991-04-15 1994-10-27 Fraunhofer Ges Forschung Dorn zur Kalt- und/oder Warmumformung von metallischem Gut und Verfahren zu seiner Herstellung
DE19636321C1 (de) * 1996-08-29 1997-11-20 Mannesmann Ag Verfahren zur Standzeiterhöhung von Lochdornen in Schrägwalzwerken
DE10024246A1 (de) * 2000-05-17 2001-11-22 Sms Demag Ag Lochdorn zum Schrägwalzen von metallischen Hohlkörpern auf Schrägwalzwerken
MXPA05006286A (es) * 2002-12-12 2006-01-27 Sumitomo Metal Ind Procedimiento de fabricacion de tubos de acero sin costura.
AR056829A1 (es) * 2005-12-07 2007-10-24 Sumitomo Metal Ind Punzon para usar en una laminadora perforadora
CN2887480Y (zh) * 2006-03-20 2007-04-11 佛山市顺德区汉达精密电子科技有限公司 冲孔结构
JP5169982B2 (ja) * 2009-03-03 2013-03-27 新日鐵住金株式会社 プラグ、穿孔圧延機、およびそれを用いた継目無管の製造方法
CN202061979U (zh) * 2011-05-10 2011-12-07 山东雷帕得弹簧有限公司 复合孔热成型模具

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023073011A1 (en) 2021-10-28 2023-05-04 Vallourec Deutschland Gmbh Piercing mandrel having a piercing mandrel lug for the production of seamless tubes
DE102021128128A1 (de) 2021-10-28 2023-05-04 Vallourec Deutschland Gmbh Lochdorn mit einer Lochdornnase zur Herstellung nahtloser Rohre

Also Published As

Publication number Publication date
MX370022B (es) 2019-11-28
AR097774A1 (es) 2016-04-13
UA116475C2 (uk) 2018-03-26
EA030534B1 (ru) 2018-08-31
DE102013110725B3 (de) 2015-02-12
CN105377459A (zh) 2016-03-02
ES2628728T3 (es) 2017-08-03
CN105377459B (zh) 2017-07-18
EP2991780A1 (de) 2016-03-09
JP6397032B2 (ja) 2018-09-26
WO2015044094A1 (de) 2015-04-02
US20160346820A1 (en) 2016-12-01
EA201690448A1 (ru) 2016-07-29
MX2016003718A (es) 2016-09-16
JP2016531759A (ja) 2016-10-13
US9937540B2 (en) 2018-04-10
PL2991780T3 (pl) 2017-09-29

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