US20100251794A1 - Forging mandrel for hot-forging tubular workpieces of metal - Google Patents
Forging mandrel for hot-forging tubular workpieces of metal Download PDFInfo
- Publication number
- US20100251794A1 US20100251794A1 US12/668,282 US66828208A US2010251794A1 US 20100251794 A1 US20100251794 A1 US 20100251794A1 US 66828208 A US66828208 A US 66828208A US 2010251794 A1 US2010251794 A1 US 2010251794A1
- Authority
- US
- United States
- Prior art keywords
- mandrel
- forging
- layer
- mandrel body
- thermal conductivity
- 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.)
- Abandoned
Links
- 238000005242 forging Methods 0.000 title claims abstract description 52
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 5
- 239000002184 metal Substances 0.000 title claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000003779 heat-resistant material Substances 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 238000010285 flame spraying Methods 0.000 claims description 2
- 238000007750 plasma spraying Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000000452 restraining effect Effects 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D9/00—Bending tubes using mandrels or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/08—Accessories for handling work or tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K21/00—Making hollow articles not covered by a single preceding sub-group
Definitions
- the invention relates to a forging mandrel for hot-forging tubular workpieces of metal according to the preamble of patent claim 1 .
- Hot-forming of tubular workpieces is known from DE 10 2005 052 178 A1.
- this method involves a first forming step in which a thick-walled hollow block is produced through punching and then forged into a seamless pipe by a radial forging process which uses a forging mandrel as internal tool which is pushed into the hollow block and at least two forging jaws of a forging machine to act on the outer surface area of the hollow block.
- the hollow block is hereby turned and shifted axially in clocked manner in the phase of the idle stroke of the forging jaws.
- the forging mandrel is exposed during the forging process to significant thermal and mechanical stress, causing wear of the tool surface and decreasing the service life of the forging mandrel. Forging temperatures of above 1300° C. may occur for example.
- This forging mandrel suffers several drawbacks. On the one hand, this forging mandrel is very complex and expensive to manufacture. On the other hand, heat introduction into the mandrel material is not diminished so that the shape stability of the forging mandrel is reduced, when exposed to high temperature stress and thus causes premature failure.
- the mandrel material is made of heat-resistant alloy, with the mandrel body provided at least in the work zone with a layer which lessens heat dissipation into the mandrel body during forging and adheres firmly upon the mandrel body and which has a thickness of at least 50 ⁇ m.
- the essential novelty of this invention resides in that the layer which surrounds the mandrel body has a lower thermal conductivity than the mandrel body so that heat introduction into the mandrel body is significantly decreased to thereby realize a significantly improved shape stability, even when exposed to high forging temperatures.
- the layer has hereby in accordance with the invention a heat conductivity which is significantly lower than the one of the material of the mandrel body, advantageously by at least 50%.
- the layer on the mandrel body can be advantageously produced according to the invention in a very cost-effective way through oxidation or also through application of a respective layer, e.g. through thermal methods.
- Oxidizing the mandrel is advantageously applied when carbon steels are involved, whereas high-alloy mandrel materials involve application of the layer advantageously through thermal spraying processes, such as, e.g., flame-spraying or plasma spraying.
- the thermally applied layers may hereby contain zirconium oxide, aluminum oxide, or iron oxide, for example.
- thermal conductivity of the coating material is always significantly below the one of the mandrel material.
- the layer In order for the layer to be able to exert a recognizable effect with respect to a significantly reduced heat introduction into the mandrel body, it is advantageous when the layer has a minimum thickness of about 50 ⁇ m.
- the forging mandrel according to the invention has hereby not only the advantages with respect to improved shape stability but also with respect to a decrease of the abrasive wear. Tests have shown the presence of a certain lubricating effect of the layer material during forging to reduce the abrasive wear.
- a suitable material for the mandrel body it is essential to suit the mandrel body to the material being forged in such a way that fusion of forging mandrel and forging workpiece is prevented.
- the forging mandrel according to the invention has hereby the beneficial effect that the layer acts upon the mandrel body as a separation layer which opposes a fusion under forging pressure and temperature.
- it may also be provided to cool the outside of the mandrel body in phases of standstill. This can be implemented in a much more cost-efficient manner than internal cooling.
- the forging mandrel shown in the sole FIGURE has a mandrel body 1 provided with bevels 3 , 4 and secured to a restraining bar 2 .
- the restraining bar 2 is required to be able to move the forging mandrel in axial and rotatable relationship in a tubular workpiece, not shown here.
- the forging mandrel 1 is made of heat-resistant steel which is provided in accordance with the invention with a layer 5 which reduces in the work zone the heat introduction into the mandrel body 1 .
- the layer 5 has hereby a thermal conductivity which is significantly lower than the one of the material of the mandrel body 1 in order to reduce heat introduction and thus to ensure the shape stability of the mandrel body 1 , even when exposed to high forging temperatures.
- the mandrel body 1 is configured as solid body in the present case; it is, however, also possible to provide the mandrel body with internal cooling to dissipate as rapidly as possible unavoidable heat introduction into the mandrel body 1 during forging.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention relates to a forging mandrel for hot-forging tubular workpieces of metal, said mandrel comprising a mandrel body and a mandrel bar, in which forging mandrel the mandrel body is composed of a heat-resistant material. The forging mandrel according to the invention is embodied here in such a way that the mandrel body is provided, at least in the work zone, with a layer which reduces the dissipation of heat into the mandrel body during the forging process and adheres firmly to the mandrel body, wherein the layer has a lower thermal conductivity than the material of the mandrel body and has a thickness of at least 50 μm.
Description
- The invention relates to a forging mandrel for hot-forging tubular workpieces of metal according to the preamble of patent claim 1.
- Hot-forming of tubular workpieces, such as, e.g., seamless steel pipes, is known from DE 10 2005 052 178 A1.
- Starting from a block heated to forming temperature, this method involves a first forming step in which a thick-walled hollow block is produced through punching and then forged into a seamless pipe by a radial forging process which uses a forging mandrel as internal tool which is pushed into the hollow block and at least two forging jaws of a forging machine to act on the outer surface area of the hollow block. The hollow block is hereby turned and shifted axially in clocked manner in the phase of the idle stroke of the forging jaws.
- The forging mandrel is exposed during the forging process to significant thermal and mechanical stress, causing wear of the tool surface and decreasing the service life of the forging mandrel. Forging temperatures of above 1300° C. may occur for example.
- In order to minimize wear caused as a result of thermal exposure, it is known from DE 2825940 A1 to cool the forging mandrel from the inside in order to accelerate heat dissipation from the surface of the mandrel into the mandrel.
- In order to increase wear resistance of the mandrel, it is further proposed to surround the mandrel body with an outer jacket of highly heat-resistant material, e.g. a nickel or cobalt base alloy.
- This forging mandrel suffers several drawbacks. On the one hand, this forging mandrel is very complex and expensive to manufacture. On the other hand, heat introduction into the mandrel material is not diminished so that the shape stability of the forging mandrel is reduced, when exposed to high temperature stress and thus causes premature failure.
- It is an object of the invention to provide a forging mandrel for hot-forging tubular workpieces of metal, which forging mandrel can be manufactured inexpensively and exhibits high wear resistance while yet is of stable shape even when exposed to high forging temperatures.
- Starting form the preamble, this object is solved in combination with the characterizing features of claim 1. Advantageous refinements are the subject matter of sub-claims.
- According to the teaching of the invention, the mandrel material is made of heat-resistant alloy, with the mandrel body provided at least in the work zone with a layer which lessens heat dissipation into the mandrel body during forging and adheres firmly upon the mandrel body and which has a thickness of at least 50 μm.
- The essential novelty of this invention resides in that the layer which surrounds the mandrel body has a lower thermal conductivity than the mandrel body so that heat introduction into the mandrel body is significantly decreased to thereby realize a significantly improved shape stability, even when exposed to high forging temperatures.
- The layer has hereby in accordance with the invention a heat conductivity which is significantly lower than the one of the material of the mandrel body, advantageously by at least 50%.
- The layer on the mandrel body can be advantageously produced according to the invention in a very cost-effective way through oxidation or also through application of a respective layer, e.g. through thermal methods.
- Oxidizing the mandrel is advantageously applied when carbon steels are involved, whereas high-alloy mandrel materials involve application of the layer advantageously through thermal spraying processes, such as, e.g., flame-spraying or plasma spraying.
- The thermally applied layers may hereby contain zirconium oxide, aluminum oxide, or iron oxide, for example.
- It is hereby essential that the thermal conductivity of the coating material is always significantly below the one of the mandrel material.
- In order for the layer to be able to exert a recognizable effect with respect to a significantly reduced heat introduction into the mandrel body, it is advantageous when the layer has a minimum thickness of about 50 μm.
- The forging mandrel according to the invention has hereby not only the advantages with respect to improved shape stability but also with respect to a decrease of the abrasive wear. Tests have shown the presence of a certain lubricating effect of the layer material during forging to reduce the abrasive wear.
- For selecting a suitable material for the mandrel body, it is essential to suit the mandrel body to the material being forged in such a way that fusion of forging mandrel and forging workpiece is prevented.
- The forging mandrel according to the invention has hereby the beneficial effect that the layer acts upon the mandrel body as a separation layer which opposes a fusion under forging pressure and temperature.
- As a certain heat introduction into the mandrel body cannot be completely eliminated, it may be further prudent to provide the mandrel body with an additional internal cooling in order to assist the shape stability of the mandrel.
- As an alternative, it may also be provided to cool the outside of the mandrel body in phases of standstill. This can be implemented in a much more cost-efficient manner than internal cooling.
- In order to limit the heat introduction into the mandrel body to a minimum during the forging process, it may be further prudent to move the mandrel in the workpiece during forging because in this procedure constantly other work zones of the forging mandrel surface come into engagement so that local heat introduction is reduced.
- The forging mandrel according to the invention will be described in greater detail with reference to an illustration.
- The forging mandrel shown in the sole FIGURE has a mandrel body 1 provided with
bevels restraining bar 2. Therestraining bar 2 is required to be able to move the forging mandrel in axial and rotatable relationship in a tubular workpiece, not shown here. - The forging mandrel 1 is made of heat-resistant steel which is provided in accordance with the invention with a
layer 5 which reduces in the work zone the heat introduction into the mandrel body 1. - The
layer 5 has hereby a thermal conductivity which is significantly lower than the one of the material of the mandrel body 1 in order to reduce heat introduction and thus to ensure the shape stability of the mandrel body 1, even when exposed to high forging temperatures. - The mandrel body 1 is configured as solid body in the present case; it is, however, also possible to provide the mandrel body with internal cooling to dissipate as rapidly as possible unavoidable heat introduction into the mandrel body 1 during forging.
-
-
No. Designation 1 Mandrel body 2 Restraining bar 3, 4 Bevel 5 layer
Claims (8)
1.-6. (canceled)
7. A forging mandrel for hot-forging a tubular workpiece of metal, comprising:
a mandrel body made of heat-resistant material; and
a layer adhering firmly upon the mandrel body at least in a work zone thereof, said layer being configured to reduce heat dissipation into the mandrel body during forging and having a thermal conductivity which is lower than a thermal conductivity of the material of the mandrel body, said layer having a thickness of at least 50 μm.
8. The forging mandrel of claim 7 , wherein the layer is an oxide layer.
9. The forging mandrel of claim 7 , wherein the layer is applied onto the mandrel body through a flame-spraying process.
10. The forging mandrel of claim 7 , wherein the layer is applied onto the mandrel body through plasma spraying.
11. The forging mandrel of claim 7 , wherein the thermal conductivity of the layer is lower by at least 50% than the thermal conductivity of the material of the mandrel body.
12. The forging mandrel of claim 7 , wherein the mandrel body is constructed in the form of a hollow body which is provided with an opening on one side and includes an internal cooling device which extends at least into the work zone.
13. The forging mandrel of claim 7 , wherein the mandrel body has a mandrel bar to allow displacement of the mandrel body within the workpiece in axial and rotatable manner.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007032804.6 | 2007-07-10 | ||
| DE102007032804A DE102007032804B3 (en) | 2007-07-10 | 2007-07-10 | Forging mandrel for hot-forging of tubular work-pieces made of metal has a mandrel body made from heat-resistant material and a mandrel rod |
| PCT/DE2008/001067 WO2009006873A1 (en) | 2007-07-10 | 2008-06-25 | Forging mandrel for hot-forging tubular workpieces of metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20100251794A1 true US20100251794A1 (en) | 2010-10-07 |
Family
ID=39670381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US12/668,282 Abandoned US20100251794A1 (en) | 2007-07-10 | 2008-06-25 | Forging mandrel for hot-forging tubular workpieces of metal |
Country Status (17)
| Country | Link |
|---|---|
| US (1) | US20100251794A1 (en) |
| EP (1) | EP2176013B1 (en) |
| JP (1) | JP2010532715A (en) |
| KR (1) | KR20100030628A (en) |
| CN (1) | CN101743077B (en) |
| AR (1) | AR067462A1 (en) |
| AT (1) | ATE485903T1 (en) |
| AU (1) | AU2008274744B2 (en) |
| BR (1) | BRPI0812826A2 (en) |
| CA (1) | CA2693450A1 (en) |
| DE (2) | DE102007032804B3 (en) |
| EA (1) | EA015221B1 (en) |
| ES (1) | ES2355125T3 (en) |
| PL (1) | PL2176013T3 (en) |
| UA (1) | UA96053C2 (en) |
| WO (1) | WO2009006873A1 (en) |
| ZA (1) | ZA200908608B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130036785A1 (en) * | 2011-08-12 | 2013-02-14 | Gfm-Gmbh | Apparatus for forging a hollow body |
| US9248483B2 (en) | 2009-11-02 | 2016-02-02 | Vallourec Deutschland Gmbh | Method and device for the optimized circulation of rods in the production of a seamlessly hot-fabricated steel pipe according to the continuous pipe method |
| US11122741B2 (en) * | 2018-01-30 | 2021-09-21 | Cnh Industrial America Llc | Stalk roller assembly for an agricultural system |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2241386A1 (en) * | 2009-04-16 | 2010-10-20 | Felss GmbH | Reforming tool for creating an internal profile, in particular an internal gear of a workpiece |
| AT511745B1 (en) * | 2011-08-12 | 2014-09-15 | Gfm Gmbh | DEVICE FOR FORGING A HOLLOW BODY |
| DE102013219310A1 (en) | 2013-09-25 | 2015-03-26 | Gfm Gmbh | Process for hot forging a seamless hollow body made of material that is difficult to form, in particular of steel |
| CN104275363A (en) * | 2013-11-30 | 2015-01-14 | 阜新华通管道有限公司 | Seamless steel pipe following tire forging method for high-temperature and high-pressure pipe fitting |
| JP6521369B2 (en) * | 2015-05-11 | 2019-05-29 | 日立金属株式会社 | Hot forging die |
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| US4393677A (en) * | 1979-12-25 | 1983-07-19 | Nippon Kokan Kabushiki Kaisha | Plugs for use in piercing and elongating mills |
| US20040154366A1 (en) * | 2001-05-22 | 2004-08-12 | Peter Schule | Tool for a bending machine |
| US20070006626A1 (en) * | 2004-03-11 | 2007-01-11 | Tomio Yamakawa | Seamless tube piercing/rolling plug, seamless tube piercing/rolling apparatus, and seamless tube producing method therewith |
| US7587923B1 (en) * | 2006-07-12 | 2009-09-15 | Raul Garza | Method of making a tubular |
| US7861565B2 (en) * | 2006-12-28 | 2011-01-04 | Sumitomo Metal Industries, Ltd. | Method for applying lubricant onto mandrel bar, method for controlling thickness of lubricant film on mandrel bar, and method for manufacturing seamless steel pipe |
| US20120210761A1 (en) * | 2009-03-03 | 2012-08-23 | Sumitomo Metal Industries, Ltd. | Plug, Piercing-Rolling Mill, and Method of Producing Seamless Tube by Using the Same |
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| CN2458107Y (en) * | 2000-12-27 | 2001-11-07 | 中国科学院广州能源研究所 | Electric radiation preheater for forging die |
| JP2004066246A (en) * | 2002-08-01 | 2004-03-04 | Osg Corp | Spherical surface burnish-rolling circular die and its manufacturing method |
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-
2007
- 2007-07-10 DE DE102007032804A patent/DE102007032804B3/en active Active
-
2008
- 2008-06-25 CA CA2693450A patent/CA2693450A1/en not_active Abandoned
- 2008-06-25 AU AU2008274744A patent/AU2008274744B2/en not_active Ceased
- 2008-06-25 WO PCT/DE2008/001067 patent/WO2009006873A1/en not_active Ceased
- 2008-06-25 BR BRPI0812826-0A2A patent/BRPI0812826A2/en not_active IP Right Cessation
- 2008-06-25 CN CN200880023941XA patent/CN101743077B/en not_active Expired - Fee Related
- 2008-06-25 JP JP2010515345A patent/JP2010532715A/en not_active Withdrawn
- 2008-06-25 KR KR1020097027175A patent/KR20100030628A/en not_active Ceased
- 2008-06-25 US US12/668,282 patent/US20100251794A1/en not_active Abandoned
- 2008-06-25 DE DE502008001670T patent/DE502008001670D1/en active Active
- 2008-06-25 UA UAA201001359A patent/UA96053C2/en unknown
- 2008-06-25 PL PL08773279T patent/PL2176013T3/en unknown
- 2008-06-25 ES ES08773279T patent/ES2355125T3/en active Active
- 2008-06-25 EP EP08773279A patent/EP2176013B1/en not_active Revoked
- 2008-06-25 AT AT08773279T patent/ATE485903T1/en active
- 2008-06-25 EA EA201000187A patent/EA015221B1/en not_active IP Right Cessation
- 2008-07-07 AR ARP080102919A patent/AR067462A1/en active IP Right Grant
-
2009
- 2009-12-03 ZA ZA2009/08608A patent/ZA200908608B/en unknown
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4393677A (en) * | 1979-12-25 | 1983-07-19 | Nippon Kokan Kabushiki Kaisha | Plugs for use in piercing and elongating mills |
| US20040154366A1 (en) * | 2001-05-22 | 2004-08-12 | Peter Schule | Tool for a bending machine |
| US20070006626A1 (en) * | 2004-03-11 | 2007-01-11 | Tomio Yamakawa | Seamless tube piercing/rolling plug, seamless tube piercing/rolling apparatus, and seamless tube producing method therewith |
| US20080134742A1 (en) * | 2004-03-11 | 2008-06-12 | Tomio Yamakawa | Seamless tube piercing/rolling plug, and seamless tube producing method using same |
| US7506526B2 (en) * | 2004-03-11 | 2009-03-24 | Sumitomo Metal Industries, Ltd. | Seamless tube piercing/rolling plug, and seamless tube producing method using same |
| US7587923B1 (en) * | 2006-07-12 | 2009-09-15 | Raul Garza | Method of making a tubular |
| US7861565B2 (en) * | 2006-12-28 | 2011-01-04 | Sumitomo Metal Industries, Ltd. | Method for applying lubricant onto mandrel bar, method for controlling thickness of lubricant film on mandrel bar, and method for manufacturing seamless steel pipe |
| US20120210761A1 (en) * | 2009-03-03 | 2012-08-23 | Sumitomo Metal Industries, Ltd. | Plug, Piercing-Rolling Mill, and Method of Producing Seamless Tube by Using the Same |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9248483B2 (en) | 2009-11-02 | 2016-02-02 | Vallourec Deutschland Gmbh | Method and device for the optimized circulation of rods in the production of a seamlessly hot-fabricated steel pipe according to the continuous pipe method |
| US20130036785A1 (en) * | 2011-08-12 | 2013-02-14 | Gfm-Gmbh | Apparatus for forging a hollow body |
| US9409226B2 (en) * | 2011-08-12 | 2016-08-09 | Gfm-Gmbh | Apparatus for forging a hollow body |
| US11122741B2 (en) * | 2018-01-30 | 2021-09-21 | Cnh Industrial America Llc | Stalk roller assembly for an agricultural system |
| US20220000027A1 (en) * | 2018-01-30 | 2022-01-06 | Cnh Industrial America Llc | Stalk roller assembly for an agricultural system |
| US12075726B2 (en) * | 2018-01-30 | 2024-09-03 | Cnh Industrial America Llc | Stalk roller assembly for an agricultural system |
Also Published As
| Publication number | Publication date |
|---|---|
| PL2176013T3 (en) | 2011-05-31 |
| BRPI0812826A2 (en) | 2014-12-09 |
| ATE485903T1 (en) | 2010-11-15 |
| EP2176013B1 (en) | 2010-10-27 |
| KR20100030628A (en) | 2010-03-18 |
| AR067462A1 (en) | 2009-10-14 |
| AU2008274744A1 (en) | 2009-01-15 |
| EA015221B1 (en) | 2011-06-30 |
| UA96053C2 (en) | 2011-09-26 |
| DE502008001670D1 (en) | 2010-12-09 |
| DE102007032804B3 (en) | 2008-09-04 |
| JP2010532715A (en) | 2010-10-14 |
| ZA200908608B (en) | 2011-02-23 |
| AU2008274744A2 (en) | 2010-04-15 |
| AU2008274744B2 (en) | 2011-07-14 |
| ES2355125T3 (en) | 2011-03-23 |
| CN101743077B (en) | 2011-07-13 |
| CA2693450A1 (en) | 2009-01-15 |
| CN101743077A (en) | 2010-06-16 |
| EP2176013A1 (en) | 2010-04-21 |
| WO2009006873A1 (en) | 2009-01-15 |
| EA201000187A1 (en) | 2010-06-30 |
| WO2009006873A9 (en) | 2010-01-21 |
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