EP2991780A1 - Lochdorn mit verbesserter standzeit zur herstellung nahtloser rohre - Google Patents
Lochdorn mit verbesserter standzeit zur herstellung nahtloser rohreInfo
- Publication number
- EP2991780A1 EP2991780A1 EP14772318.3A EP14772318A EP2991780A1 EP 2991780 A1 EP2991780 A1 EP 2991780A1 EP 14772318 A EP14772318 A EP 14772318A EP 2991780 A1 EP2991780 A1 EP 2991780A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piercer
- nose
- mandrel
- main body
- piercing
- 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.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 6
- 239000005068 cooling lubricant Substances 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 12
- 238000004080 punching Methods 0.000 claims description 12
- 230000007704 transition Effects 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000001050 lubricating effect Effects 0.000 claims description 2
- 239000007769 metal material Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 14
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 description 9
- 238000013461 design Methods 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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.
- seamless tubes are produced by a process in which cylindrically shaped and heated in a rotary hearth furnace starting material, so-called round blocks, in a cross-rolling mill using an axially fixed of piercer and mandrel
- Inner tool is formed into a tubular hollow block.
- the block is after the detection of the cross rolling mill helically transported by the cross rolling mill and thus on the axially stationary inner tool and in the other
- the hole is created by driving the round block through the inclined rollers and pressing it over a piercer.
- the perforated mandrel itself usually has a diameter increasing steadily from the tip.
- the usually consisting of a high-temperature tool steel piercer has in addition to the actual punching the task any material tears to re-weld, to smooth the inner surface of the resulting hollow block and to bring its wall thickness as uniformly as possible to the desired level.
- the mandrel tip thermally and mechanically stress particularly so that it has wear traces already after a few holes, which quickly lead to defective changes in the geometry of the dome and thus to internal errors and geometry deviations on the hollow block.
- the cooling lubricant is passed through the main body of the piercer over obliquely extending into the piercer tip outlet openings in the hollow block.
- the piercer tip consists of a cylindrical portion and a hemispherical tip, wherein the
- Punch mandrel body are arranged.
- 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.
- mandrel nose and body made of different materials and replace if necessary only the piercer tip.
- the disadvantage here is that the mandrel tip uncooled and the
- EP 1 961 497 B1 Another piercing mandrel of a piercing mill is 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 oblique rolling, taking into account a qualitative improvement of the inner surface of the perforated block and round
- a piercer comprising a piercing lug nose and a piercer main body, the to a
- Mandrel is connectable, which is characterized in that the
- Piercer is arranged. In combination with the inverted conical geometry of the spike nose or the nose cap can be a significant
- Inner surface of the hollow block can be achieved, since clogging of the precisely arranged in this area outlet opening and thus a reduced or even completely interrupted cooling is effectively avoided.
- the lug nose in particular when punching steels that are difficult to form with more than 5.0% by weight of chromium, has the special geometric design of the lug nose or of the nosecaps, the diameter tapering conically towards the lug body, ie being conical inversely.
- the nose cap and mandrel main body is a "gusset" significantly enlarged in comparison to known piercer spikes, in which the outlet opening for the cooling lubricant is preferably arranged radially, thereby ensuring that the exit opening for the cooling lubricant does not come into contact with the material of the round block to be punched can come, so that clogging of the precisely arranged in this area outlet opening and thus a reduced or even completely interrupted cooling is effectively avoided.
- 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, so that the condition 0.10 x DB ⁇ L ⁇ 3 x 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 for the reverse conical design of the lug nose or the Nose cap necessary 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 piercer according to the invention.
- a radial arrangement of the outlet opening in the transition region of mandrel nose and mandrel main body is advantageous because their production can be much easier compared to known, oblique bores introduced.
- the outlet opening is formed as an annular gap to ensure a uniform lubrication over the circumference of the piercing pin.
- 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.
- Flow rate of cooling lubricant can be arranged, for example, four, six or eight drain lines in the nose core.
- the nose core is detachably connected to the mandrel main body, so that if necessary, only the mandrel main body needs to be replaced and not in addition the nose core, with the channels introduced therein for the cooling lubricant inflow and outflow ,
- the compound of the nose core and mandrel main body according to the invention either by means of a screw or for easier mounting and
- Disassembly advantageously be done by means of a bayonet lock.
- mandrel nose and body can also be made of different materials
- FIG. 1 is a schematic representation of the Lochungsreaes in one
- Figure 2 shows the piercer according to the invention in an enlarged schematic representation
- FIG. 3 shows sectional views of a perforated-metal nose.
- a cone slanting mill is shown schematically, which is a solid steel block by means of a piercing mandrel according to the invention to a
- 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.
- Counter-rotation direction of the work rolls 2, 2 ', the block 3 or the hollow block tube 6 is moved helically over the axially stationary 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 mandrel nose 4.2 has a conically tapered diameter relative to the perforated mandrel main body 4.1, wherein in the transition region of perforated mandrel main body 4.1 and piercer nose 4.2 to be formed
- Hollow block pipe 6 forms a gusset 7, which does not interfere with the material of
- Hollow block pipe 6 comes into contact during punching. Not shown here is exactly in this gusset or in the transition region arranged outlet opening for the cooling lubricant and the cooling of the piercing pin.
- FIG. 2 shows geometric details of the perforated mandrel 4 in accordance with the invention
- 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 in this case 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 ,
- the mandrel nose 4.2 at the front end has a radius r, which is at least 3 mm.
- Figure 3 shows schematically the formation of the piercer nose 4.2 in a longitudinal section (left partial image) and in a cross section (right partial image).
- 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" is provided between the front end of the nose core 4.2a and the inside of the nose cap 4.2b
- 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 an outlet opening 1 1 in the transition region of piercer nose 4.2 and mandrel body 4.1.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Of Metal (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Earth Drilling (AREA)
- Forging (AREA)
- Drilling Tools (AREA)
- Punching Or Piercing (AREA)
Abstract
Description
Claims
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 true EP2991780A1 (de) | 2016-03-09 |
EP2991780B1 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 (de) |
EP (1) | EP2991780B1 (de) |
JP (1) | JP6397032B2 (de) |
CN (1) | CN105377459B (de) |
AR (1) | AR097774A1 (de) |
DE (1) | DE102013110725B3 (de) |
EA (1) | EA030534B1 (de) |
ES (1) | ES2628728T3 (de) |
MX (1) | MX370022B (de) |
PL (1) | PL2991780T3 (de) |
UA (1) | UA116475C2 (de) |
WO (1) | WO2015044094A1 (de) |
Families Citing this family (3)
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 |
DE102021128128A1 (de) | 2021-10-28 | 2023-05-04 | Vallourec Deutschland Gmbh | Lochdorn mit einer Lochdornnase zur Herstellung nahtloser Rohre |
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)
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 (de) * | 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 |
DE60326086D1 (de) * | 2002-12-12 | 2009-03-19 | Sumitomo Metal Ind | |
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 |
-
2013
- 2013-09-27 DE DE102013110725.7A patent/DE102013110725B3/de not_active Expired - Fee Related
-
2014
- 2014-09-22 CN CN201480039565.9A patent/CN105377459B/zh active Active
- 2014-09-22 UA UAA201512517A patent/UA116475C2/uk unknown
- 2014-09-22 PL PL14772318T patent/PL2991780T3/pl unknown
- 2014-09-22 ES ES14772318.3T patent/ES2628728T3/es active Active
- 2014-09-22 US US14/917,371 patent/US9937540B2/en active Active
- 2014-09-22 WO PCT/EP2014/070153 patent/WO2015044094A1/de active Application Filing
- 2014-09-22 EP EP14772318.3A patent/EP2991780B1/de active Active
- 2014-09-22 MX MX2016003718A patent/MX370022B/es active IP Right Grant
- 2014-09-22 JP JP2016544747A patent/JP6397032B2/ja active Active
- 2014-09-22 EA EA201690448A patent/EA030534B1/ru not_active IP Right Cessation
- 2014-09-25 AR ARP140103560A patent/AR097774A1/es active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
UA116475C2 (uk) | 2018-03-26 |
CN105377459B (zh) | 2017-07-18 |
US9937540B2 (en) | 2018-04-10 |
DE102013110725B3 (de) | 2015-02-12 |
ES2628728T3 (es) | 2017-08-03 |
CN105377459A (zh) | 2016-03-02 |
PL2991780T3 (pl) | 2017-09-29 |
MX370022B (es) | 2019-11-28 |
MX2016003718A (es) | 2016-09-16 |
EP2991780B1 (de) | 2017-04-12 |
WO2015044094A1 (de) | 2015-04-02 |
EA201690448A1 (ru) | 2016-07-29 |
US20160346820A1 (en) | 2016-12-01 |
EA030534B1 (ru) | 2018-08-31 |
JP6397032B2 (ja) | 2018-09-26 |
JP2016531759A (ja) | 2016-10-13 |
AR097774A1 (es) | 2016-04-13 |
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Inventor name: KLEMPEL, CHRISTIAN Inventor name: BAADJOU, RENE Inventor name: KUEMMERLING, ROLF Inventor name: BRAUN, WINFRIED |
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