CN102896265A - Pipe forging method with cast hollow block - Google Patents
Pipe forging method with cast hollow block Download PDFInfo
- Publication number
- CN102896265A CN102896265A CN201210266573XA CN201210266573A CN102896265A CN 102896265 A CN102896265 A CN 102896265A CN 201210266573X A CN201210266573X A CN 201210266573XA CN 201210266573 A CN201210266573 A CN 201210266573A CN 102896265 A CN102896265 A CN 102896265A
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- CN
- China
- Prior art keywords
- briquet
- hollow
- forging
- coating
- pipe
- Prior art date
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- Pending
Links
- 238000005242 forging Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000007493 shaping process Methods 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 238000003754 machining Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000314 lubricant Substances 0.000 claims description 3
- 238000009987 spinning Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 29
- 239000011248 coating agent Substances 0.000 description 28
- 239000011159 matrix material Substances 0.000 description 26
- 239000000463 material Substances 0.000 description 12
- 239000010410 layer Substances 0.000 description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000012876 carrier material Substances 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 229910001092 metal group alloy Inorganic materials 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009750 centrifugal casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010285 flame spraying Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention relates to a pipe forging method with cast hollow block. The method comprises the following steps of a. conveying a tubular billet (104) with a central cavity (104a) to a radial forging apparatus; and b. forging the tubular billet (104) into a pipe by decreasing an outer diameter of the billet and a radial thickness of a wall of the billet. Besides, the method also comprises a step of a1. making the tubular billet (104) with the central cavity (104a) by a primary shaping operation before the step a.
Description
Technical field
The present invention relates to a kind of method that is used for hammer welded pipe of preamble according to claim 1.
Background technology
File EP 1 814 679 A1 have illustrated a kind of method for the manufacture of seamless hot worked steel pipe, the briquet that is heated to therein deformation temperature is deformed into hollow briquet (Hohlblock) by punching in the first deforming step, wherein next produce production tube by radial forging with identical heat in the second deforming step.
Summary of the invention
The object of the invention is to illustrate a kind of for the favourable method of the cost of hammer welded pipe.
For the mentioned method of beginning, this purpose utilizes the feature of the characteristic of claim 1 to realize according to the present invention.By make the hollow briquet with central recess via forming technology (Urformverfahren), provide hollow briquet in simple especially and effective mode.According to the principle that is shaped, briquet and produce in same forming step for hollow briquet being forged into the required central recess of pipe is reduced thereby prepare expending of hollow briquet at this.
Usually preferably, the present invention relates to by the alloy of iron-based, steel or also have nickel-base alloy or pipe that titanium alloy consists of especially.
In the of the present invention first preferred form of implementation, step a1 comprises electric-slag-remelting process (Elektro-Schlacke-Umschmelzverfahren).Especially for steel, be provided for thus the effective and general method of the shaping of hollow briquet.
To this alternatively, manufacturing process comprises centre spinning (Schleudergiessverfahren).Centrifugal casting is specially adapted to be combined with the radial forging method, because usually produced the hollow briquet with central recess.
In of the present invention one common favourable improvement project, can be arranged to, in step a2, after step a1 and before step b, realize the machining of briquet.Particularly advantageously, but not necessarily, this can comprise and removes casting skin (Gusshaut).Before introducing the radial forging device, for example also can relate to the removal burr of the mitigation (Vergleichmaessigung) of recess, hollow briquet or other suitable preliminary treatment.
Usually preferably be arranged among the step a3 after step a1 and before step b, carry out the heating of hollow briquet, in order to reach the deformation temperature that limits for the radial forging process.This can be quite particularly advantageous for alloy and tissue, and it has relatively narrow temperature province for forging processing.
To this alternatively, can particularly advantageously be arranged to the heating of hollow briquet in the middle of between step a1 and step b, not carrying out for energy savings and cost.At this, therefore use very high heat that when being shaped, exist, common, in order to reach the temperature that is suitable for radial forging.Realized the controlled cooling of the hollow briquet that is shaped before in case of necessity can be in introducing the radial forging device in such method.
In of the present invention one preferred detailed design scheme, in step a4, before step b, realize making the hollow briquet scale removal that is shaped, preferably but not necessarily pass through high pressure method.
Preferably be arranged in addition, before step b, lubricate at least one zone of the recess of hollow briquet by means of lubricant.Such lubricant preferably can be constructed based on glass and/or phosphate and/or graphite.
The step b that hollow briquet is forged into pipe in the situation that external diameter and the wall thickness of hollow briquet reduces advantageously carries out by means of the forging axle (Schmiededorn) as in-house tool usually.Also can consider not to be with the free forming that forges axle to forge on the principle, be effective especially yet use the forging axle.Forging process so realizes mostly that at this namely the wall of hollow briquet is pressed in the forging axle of internal placement in recess by the forging piece (Schmiedebacke) of outside, in order to cause distortion according to the type of forging.Forge piece and especially can hydraulically drive, usually obtain thus quite in check pressure at the workpiece place and change.But alternatively also can be provided with another driving mechanism that forges piece, for example by weight whereabouts (Fallgewicht) etc.
Forge axle and have coating in a preferred improvement project, it particularly preferably but not necessarily have oxide layer, ceramic layer and/or with the coating of coated metal alloy.These coating can present individually or in combination.Coated metal alloy and/or carbide alloy also are understood to such coating as coating, and it has the especially hard material of the character of pottery, for example tungsten carbide etc. that is included in metal alloy and/or the carbide alloy.Such coating is often made by thermal methods (such as plasma-built-up welding (Auftragsschweissen), electric arc-built-up welding etc.).At this; metal alloy is used for providing enough tough and tensile matrix, and it provides the corresponding high hardness of passing through on the other hand the surface that the hard material phase that comprises and/or hard material particle acquisition outwards work with good and tack-free connection of the matrix of forging axle (especially steel) on the one hand.
Be arranged in a particularly preferred improvement project of forging axle, the matrix that forges axle has surface-die mould (Profilierung), and wherein coating is applied on surface-die mould.Also obtain thus additional form fit except material cooperates, this has especially and stops efficiently coating to come off from matrix.Die mould can be complementary with corresponding mechanical load according to shape and orientation especially at this, for example is complementary with the power that is caused by corresponding forging piece.In particular, surperficial die mould is forging axially formation at least one undercutting (Hinterschnitt) of axle at this.Good form fit is provided thus, and it also can bear the king-sized power that the direction that comes off at coating works.Particularly preferably, surface-die mould has jut and the recess of some on this surface at matrix.
The matrix of using forging axle in the method according to the invention preferably is made of steel.
The coating that forges axle advantageously is protected from not only heat load but also mechanical load.The heat conductivity that for example coating can be pointed is in order to be reduced to heat effect on the matrix.
Usually advantageously, coating applies by the heat chemistry coating method.
Additionally can be provided with internal cooling in a common favourable improvement project of forging axle, wherein, axle can pass to cooling agent when needed.
Other feature and advantage of the present invention draw from next illustrated embodiment and dependent claims.
Description of drawings
Next illustrate and elaborate with reference to the accompanying drawings a preferred embodiment of the present invention.Wherein:
Fig. 1 has shown with the heat of the form of radial forging axle with instrument (Warmwerkzeug) with side view.
Fig. 2 has shown for the details according to Fig. 1 of the instrument-matrix of coating " Z " not also.
Fig. 3 has shown for the present details according to Fig. 1 of the instrument-matrix of coating " Z ".
Fig. 4 has shown the details according to Fig. 1 " Z " for one of the instrument-matrix of coating alternative form of implementation.
Fig. 5 has shown for passing first micrograph of heat with the details according to Fig. 1 " Z " of instrument 1; And
Fig. 6 has shown for passing second micrograph of heat with the details according to Fig. 1 " Z " of instrument 1.
Fig. 7 has shown schematically total view of radial forging device.
List of numerals
1 heat is with instrument or radial forging axle
2 instruments-matrix
3 working regions
4 coating
5 surfaces-die mould
6 juts
7 recesses
8 materials that transform
101 radial forging devices
102 executors
103 forge piece
104 briquets
Recess in the 104a briquet
105 axostylus axostyles
A is axial
B length
The D height
The A spacing
The total bed thickness of C.
The specific embodiment
What be used for hammer welded pipe preferably includes following steps according to the inventive method:
A. will be delivered to radial forging device 101 with the hollow briquet 104 of central recess 104a, and
B. in the situation that external diameter and the wall thickness of hollow briquet 104 reduces, hollow briquet 104 is forged into pipe.
At first according to the present invention in step a1, hollow briquet 104 is made with manufacturing process with its recess 104a.At this, preferably relate to centre spinning or remelting process, for example electric-slag-remelting process.
After the briquet 104 with recess 104a is shaped, realize when needed the machining of hollow briquet.At this, for example can relate to scale removal and/or relate to recess for reprocessing for the meticulous coupling of forging required size and dimension.
Fig. 7 has exemplarily shown the device 101 that is used for radial forging, can carry out the method at its place.At this, briquet 104 remains in executor or the bearing 102 in end side.The heat of sentencing the form of forging axle 1 in relative end is introduced among the recess 104a with instrument.Height in axle 1 forges piece 103 from external action hollow briquet 104 to be processed.Forge piece 103 and preferably be pressed towards hollow briquet 104 by means of hydraulic unit driver with the pressure variation that limits, in order to realize hollow briquet 104 is forged into pipe with radially working.In an alternative design, for example also can be provided with the stop (Anschlagen) of forging piece via cam mechanism.
It should be understood that the method according to this invention also can carry out at other radial forging device.
In Fig. 1 schematically illustrated with for the manufacture of the axle of the form of the axle of seamless pipe or heat with instrument 1.This form can be as requested and different and especially can be cylindricality or slightly taper.Instrument 1 has instrument-matrix 2 (it has working region 3), and extend in certain length on the direction of axis a working region 3.Instrument 1 is provided with coating 4 in working region 3, and its protection instrument 1 is avoided heat load or mechanical load.
Whole instrument-matrix shown in Figure 12 is to be removable axle point in the meaning of the present invention, and it for example can for example releasably be placed on the axle body with the form of the axostylus axostyle 105 (referring to Fig. 7) of radial forging axle 1.Other design or the splitting scheme of removable axle point 2 and axle body 105 are possible according to demand.
As that is to say being configured in accurately shown in Fig. 2 and Fig. 3 as the instrument of the section of instrument-matrix 2 according to the details in the zone " Z " of Fig. 1.Such as can be seen, the outside surface that is in diametrically of instrument-matrix 2 has surface-die mould 5, and its jut that stretches out diametrically 6 by some consists of, and jut 6 is arranged between the consequent recess 7.Jut 6 extends numerical value B at axial a, and it preferably is in the zone of about 250 μ m to 4000 μ m.Jut 6 is in the zone of about 500 μ m to 5000 μ m with respect to the height D of recess 7.Spacing A between two juts 6 preferably is in the zone of about 200 μ m to 2000 μ m.
Die mould 5 so is applied on the surface of matrix 2 at this so that its process at first glossily and next by machining insert, especially car goes out recess 7 contact pin shape or rectangle in radial section.
After this preprocessing, instrument-matrix 2 is provided with coating 4, as shown in FIG. 3.Total bed thickness C of coating 4 is at this height that fills up recess 7 and surpass jut 6.
Observe at axial a, because surface-die mould 5, therefore for the material production undercutting of coating 4, so that coating 4 sticks on the matrix 2 very regularly when the instrument 1 of utilization.
Visible one preferred embodiment or solution in Fig. 4.The preprocessing of instrument-matrix 2 is similar to according to the solution of Fig. 2 and Fig. 3 to be carried out, and that is to say that surface-die mould 5 at first is introduced in the instrument-matrix 2 of glossily processing.Corresponding with according to Fig. 2 of the variation of die mould.
Yet before applying coating 4, so at first by using hot chemical treatment method that the part of the material of matrix 2 is changed into protective layer.The material 8 that transforms is to extend with the equidistant mode of die mould 5 and to be represented by dotted lines.The width of jut (contact pin) 6 and in cross section again the degree of depth for the space of rectangle correspondingly reduce at this, as shown in Figure 4.
Between transition phase or next, coating 4 as second, outside layer is applied on the material layer 8 that so transforms, that is to say on the initial or inner protective layer that the conversion by carrier material produces, such as Fig. 4 for shown in the instrument of finishing.This is again by thermochemical method or for example realize by flame-spraying or plasma spraying.
According in the solution shown in Fig. 4, apply or produce layer 4 at carrier material 2 before or during this period, namely between carrier material (matrix) 2 and layers 4, provide a structure, it shows in the material 8 that transforms.
The example of concrete coating can draw in the diagram from Fig. 5 and Fig. 6.The inside that conversion by contact pin (jut) 6 and the filling of space (recess) 7 produce, more porous layer 8 and be applied to second on it, outside layer 4 can be identified well.Inner layer 8 (material that transforms) are current to be consisted of and is increased from the surface of matrix or die mould by iron oxide.Fill by the coating 4 of outside in space between contact pin (jut).
In the embodiment according to Fig. 5 or Fig. 6, carrier material (instrument-matrix) is converted to iron oxide by the material coated with iron oxide or matrix.Carrier material is current to be steel.The maximum ga(u)ge of the coating on matrix is about 1000 μ m in this example.
Structurized transition between carrier material and coating can optimally design according to being used for, so that can stop coating peeling off fully during use.Especially can significantly improve thus the service time of instrument 1.
The surface of coated instrument can be flattened by machining, for example grinding and polishing (before using) or rolling (during use) before using or between the operating period.
The smooth friction that reduces between instrument and workpiece (rolled piece) on surface.
Claims (8)
1. method for the manufacture of pipe, it may further comprise the steps:
A. will be delivered to the radial forging device with the hollow briquet (104) of central recess (104a), and
B. in the situation that external diameter and the wall thickness of described hollow briquet (104) reduces, described hollow briquet (104) is forged into pipe,
It is characterized in that this step:
A1. before step a. by the described hollow briquet (104) of forming technology manufacturing with described central recess (104a).
2. method according to claim 1 is characterized in that, step a1 comprises electric-slag-remelting process.
3. method according to claim 1 is characterized in that, step a1 comprises centre spinning.
4. according to each described method in the aforementioned claim, it is characterized in that this step:
A2. the described hollow briquet of machining (104) after step a1 and before step b; Especially comprise and remove the casting skin.
5. according to each described method in the aforementioned claim, it is characterized in that this step:
A3. after step a1 and before step b, heat described hollow briquet (104).
6. according to claim 1 to 4 each described methods, it is characterized in that, between step a1 and step b, do not carry out the middle heating of described hollow briquet (104).
7. according to each described method in the aforementioned claim, it is characterized in that this step:
A4. before step b, especially make hollow briquet (104) scale removal of described shaping by high pressure method.
8. according to each described method in the aforementioned claim, it is characterized in that this step:
A5. before step b especially by means of at least one zone based on the recess of the lubricated described hollow briquet (104) of the lubricant of glass and/or phosphate and/or graphite.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011109071.5 | 2011-07-30 | ||
| DE102011109071A DE102011109071A1 (en) | 2011-07-30 | 2011-07-30 | Pipe Forging Process with Urformed Hollow Block |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102896265A true CN102896265A (en) | 2013-01-30 |
Family
ID=46633976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210266573XA Pending CN102896265A (en) | 2011-07-30 | 2012-07-30 | Pipe forging method with cast hollow block |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20130025338A1 (en) |
| EP (1) | EP2554293A1 (en) |
| CN (1) | CN102896265A (en) |
| DE (1) | DE102011109071A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015091409A1 (en) * | 2013-12-17 | 2015-06-25 | Koninklijke Philips N.V. | System and instrument for delivering an object and method for detecting delivery |
| DE102014000461B4 (en) * | 2014-01-14 | 2017-01-05 | Hua Guo | Inner tool for the production of seamless steel tubes |
| EP3402619B1 (en) * | 2016-01-14 | 2020-12-23 | Howmet Aerospace Inc. | Methods for producing forged products and other worked products |
| CN107282838A (en) * | 2017-07-17 | 2017-10-24 | 中原特钢股份有限公司 | The production method of small dimension hollow pipe is forged using diameter forging machine |
| CN114178452B (en) * | 2021-12-08 | 2022-09-02 | 四川大学 | Seamless steel tube radial forging equipment and forging method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH115137A (en) * | 1997-06-11 | 1999-01-12 | Aichi Steel Works Ltd | Manufacturing method of forging with hollow shaft |
| CN1214976A (en) * | 1997-10-22 | 1999-04-28 | 中国科学院金属研究所 | High-alloy seamless deformed pipe material processing technology |
| US20080148795A1 (en) * | 2005-05-27 | 2008-06-26 | Chihiro Hayashi | Method for producing ultra thin wall metallic tube with cold working process |
| CN101706019A (en) * | 2009-12-10 | 2010-05-12 | 内蒙古北方重工业集团有限公司 | Method for manufacturing large-caliber thick-wall seamless steel tube in vertical extrusion way |
| CN101722262A (en) * | 2009-11-23 | 2010-06-09 | 北京首宏钢科技开发有限公司 | New method for producing medium and large caliber alloy steel seamless pipe by utilizing radial forging technology |
| CN101862763A (en) * | 2010-06-18 | 2010-10-20 | 常州市联谊特种不锈钢管有限公司 | Production process of large-caliber thin-walled seamless stainless steel pipe |
| DE102010012717A1 (en) * | 2010-03-25 | 2010-12-16 | Daimler Ag | Method for manufacturing hollow shaft i.e. transmission shaft, of motor vehicle, involves carrying out centrifugal casting process for producing hollow body-like semi-finished part, and forming hollow shaft from semi-finished part |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3259975A (en) * | 1963-12-19 | 1966-07-12 | Combustion Eng | Tube manufacture |
| DE1960328C3 (en) * | 1969-12-02 | 1974-04-11 | Friedrich Dr.-Ing. 4000 Duesseldorf Kocks | Method and rolling mill for rolling out a tube billet |
| JPH02224806A (en) * | 1989-02-28 | 1990-09-06 | Nkk Corp | Plug for producing seamless steel pipe |
| AT413195B (en) * | 2000-10-24 | 2005-12-15 | Boehler Edelstahl | METHOD FOR THE PRODUCTION OF CYLINDRICAL HOLLOW BODIES AND THE USE THEREOF |
| AT501152B8 (en) * | 2003-12-30 | 2007-02-15 | Gfm Beteiligungs & Man Gmbh | METHOD AND DEVICE FOR PRODUCING A CYLINDRICAL HOLLOW BODY FROM A BOARD |
| DE102005052178B4 (en) | 2004-10-25 | 2008-06-19 | V&M Deutschland Gmbh | Method for producing a seamless hot-worked steel tube |
| DE102004057682B4 (en) * | 2004-11-29 | 2007-11-15 | Daume Regelarmaturen Gmbh | Method for producing a pressure-bearing component |
| BRPI0607951A2 (en) * | 2005-02-17 | 2009-10-27 | Sumitomo Metal Ind | metal pipe and method of manufacture thereof |
| FR2904635B1 (en) * | 2006-08-03 | 2008-10-31 | Aubert & Duval Soc Par Actions | PROCESS FOR MANUFACTURING STEEL ELBOWS |
| 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 (en) * | 2009-02-11 | 2010-08-19 | Sms Meer Gmbh | Method and device for producing tubular workpieces from a pre-punched hollow block |
| DE102011010646A1 (en) * | 2010-03-02 | 2011-09-08 | Sms Meer Gmbh | Hot tool and method for its production |
-
2011
- 2011-07-30 DE DE102011109071A patent/DE102011109071A1/en not_active Withdrawn
-
2012
- 2012-07-20 EP EP12005323A patent/EP2554293A1/en not_active Withdrawn
- 2012-07-27 US US13/560,083 patent/US20130025338A1/en not_active Abandoned
- 2012-07-30 CN CN201210266573XA patent/CN102896265A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH115137A (en) * | 1997-06-11 | 1999-01-12 | Aichi Steel Works Ltd | Manufacturing method of forging with hollow shaft |
| CN1214976A (en) * | 1997-10-22 | 1999-04-28 | 中国科学院金属研究所 | High-alloy seamless deformed pipe material processing technology |
| US20080148795A1 (en) * | 2005-05-27 | 2008-06-26 | Chihiro Hayashi | Method for producing ultra thin wall metallic tube with cold working process |
| CN101722262A (en) * | 2009-11-23 | 2010-06-09 | 北京首宏钢科技开发有限公司 | New method for producing medium and large caliber alloy steel seamless pipe by utilizing radial forging technology |
| CN101706019A (en) * | 2009-12-10 | 2010-05-12 | 内蒙古北方重工业集团有限公司 | Method for manufacturing large-caliber thick-wall seamless steel tube in vertical extrusion way |
| DE102010012717A1 (en) * | 2010-03-25 | 2010-12-16 | Daimler Ag | Method for manufacturing hollow shaft i.e. transmission shaft, of motor vehicle, involves carrying out centrifugal casting process for producing hollow body-like semi-finished part, and forming hollow shaft from semi-finished part |
| CN101862763A (en) * | 2010-06-18 | 2010-10-20 | 常州市联谊特种不锈钢管有限公司 | Production process of large-caliber thin-walled seamless stainless steel pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2554293A1 (en) | 2013-02-06 |
| DE102011109071A1 (en) | 2013-01-31 |
| US20130025338A1 (en) | 2013-01-31 |
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Application publication date: 20130130 |