EP1110637A2 - Verfahren zum Herstellen eines Formbauteils und Formbauteil - Google Patents
Verfahren zum Herstellen eines Formbauteils und Formbauteil Download PDFInfo
- Publication number
- EP1110637A2 EP1110637A2 EP00127774A EP00127774A EP1110637A2 EP 1110637 A2 EP1110637 A2 EP 1110637A2 EP 00127774 A EP00127774 A EP 00127774A EP 00127774 A EP00127774 A EP 00127774A EP 1110637 A2 EP1110637 A2 EP 1110637A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal
- cross
- metal tubes
- section
- tubular
- 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
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Classifications
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/053—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure characterised by the material of the blanks
- B21D26/057—Tailored blanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- 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
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/005—Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
- B21D35/006—Blanks having varying thickness, e.g. tailored blanks
Definitions
- the invention relates to a method for producing a tubular molded component and on such a molded component.
- the diameters of conventionally manufactured inexpensive pipes especially continuously in roll forming manufactured pipes, tolerances, for example a wall thickness of one or more millimeters a few tenths Can be millimeters. So with simple face welding of the pipes, in particular pipes with thin walls, possibly bad or incomplete Connection of the pipe ends or an undesirable step formation achieved become. For this purpose, the end areas of the Pipes are checked and measured; however, this requires again an additional step.
- the invention has for its object improvements over to create the prior art and in particular a method for producing a molded component and a corresponding molded component to create a safe with relatively little effort and preferably inexpensive manufacture of molded components various pipes, especially molded parts with stronger ones Allow variation along the axial length.
- This task is solved on the one hand by a method for manufacturing a molded component in which at least one metal tube of at least two metal pipes of different cross-sections and / or different wall thickness and / or different Material properties of the cross section of at least one End area is changed so that end faces the end regions of the two metal tubes matched to one another and the cross sections of the end regions of the metal pipes are the corresponding ones Cross sections of the molded component or one of the hydroforming process used outer shape at least essentially correspond.
- the metal pipes are on the front End faces subsequently together to form a tubular semi-finished product welded, the following in a hydroforming process is deformed.
- this task is carried out in the molded component mentioned at the beginning solved by connecting the two tubular sections
- the weld seam is at least largely stress-free.
- This Molded component is in particular by the method according to the invention producible.
- a tubular end region or tubular End areas of both metal tubes in their cross section of an end shape of the molded component must at least largely correspond to the area the weld seam in the subsequent hydroforming process just widened a little so that the metal in the area of the weld, advantageously only in one Dimensions are expanded so that it remains in its flowable area and thus no or only low tensions in the Area of the weld.
- the cross section of the end region of a metal pipe or the cross sections of the end regions of both metal pipes thus changed so that the end faces of the End areas are adapted to each other, so that a good connection the pipe ends can be guaranteed during the welding process.
- the end faces of metal pipes different wall thicknesses can e.g. flush with the scope be adjusted so that there is a smooth outer surface of the tubular Semi-finished product and later the molded component, so that the different wall thicknesses of the pipe materials from the outside are recognizable.
- the cross sections of the end regions of the Metal pipes of the corresponding cross section of the final shape that is the cross section of the molded component or the area of the outer shape, the the end areas of the pipes or the connecting area of the Surrounds semi-finished product when inserted into the outer shape, at least largely adjusted or adjusted.
- a uniform gap between the connection area of the semi-finished product and the inner surface of the outer mold remain; however, it is also the formation of an uneven gap possible, so that subsequent IHU deformations a greater deformation of a part of the connection area is reached.
- the gap between that Connection area and the inner surface of the outer shape can for example a few millimeters or a few tenths of a millimeter.
- the gap is advantageously chosen such that the metal during the subsequent hydroforming only experiences a relative stretch at which it is still in its is flowable area, so in the area of the weld no or only low voltages are generated.
- the end regions of the metal tubes can in particular be mechanical be deformed.
- an expanding mandrel can be used, for example a taper by means of a narrowing ring and / or an end pulling device can be achieved.
- the changed cross section of the metal pipe is independent of the tolerances of the original workpieces and is only determined by these tools.
- Both metal tubes have a bonded deformation that is independent on the wall thickness or the material properties of the pipes can.
- this can advantageously be used to change the cross section of the end area used tool in the following Welding process remain on the metal pipe so that through the tool a good fixation of the end area of the tube is achieved, without resilience of the metal after the change in cross-section again a change in shape of the end area occurs.
- the welding device can in particular already during or before the step of changing the cross-section, i.e. in particular the expansion process or the narrowing process to which Pipe ends are created.
- a common tool e.g. one common narrowing ring in which the pipe ends from both sides be inserted or by a common expanding mandrel the two pipe ends are pushed on from two sides.
- the common expanding mandrel as a retractable expanding mandrel is formed, it can be retracted after welding or folded and axially from the tubular semi-finished product be removed.
- the common tool can be used in the subsequent Welding process basically also in the welding process be included, e.g. serve as an electrode for welding; if the tool is not used in the welding process it can advantageously be grounded.
- Pipes in cross section can be changed if the cross section a tube already essentially the final shape of the molded component corresponds.
- the cross section of the end region can of the pipe can be changed with a smaller wall thickness.
- the Tolerances in the pipe with a larger wall thickness are particularly then not significant if the pipe has a thinner wall inside of the tolerance range with its entire face End face on the front end face of the tube with a larger Wall thickness is present.
- an in Circumferential groove may be formed for receiving the weld between the pipe ends serves.
- This will, on the one hand post-processing of the semi-finished product in the area of Switzerland seam and on the other hand a strain on the outer shape the solidified, generally wedge-shaped weld in the hydraulic Expansion process avoided or at least kept low, so that the life of the outer shape is increased.
- the groove can also be axial Fixing the semi-finished product during the hydroforming process be used.
- An outer mold or a die or a device for hydroforming, in the inside surface of the outer shape such a circumferential groove for receiving a weld seam is already in itself Unique position viewed as an essential concept of the invention.
- the groove can be so deep in relation to the weld seam be designed so that the weld seam even during expansion does not rest on the groove base and only the pipe end areas lie next to the weld seam on the outer shape; in this Fall is only by the axial forces at the weld Expanding burdened.
- the groove can be made smaller Depth are formed so that the weld seam during of widening rests on the base of the groove and, if necessary, is slightly deformed becomes.
- the pipe ends to a Post-treatment of the weld seam can be dispensed with if the outer shape is formed with the groove running in the circumferential direction, because in this case damage to the tool and the load the weld seam and the load on the surrounding weld seam Metal is avoided during expansion or at least is low.
- Electrodes can be used to weld the end faces or a friction welding process can be used.
- the end faces are controlled by means of a magnet Arc welding process welded together.
- the axial tracking of the pipe material can advantageously one in the connection area of the end areas of Metal pipes of different wall thickness, beveled step or be equalized, whereby the strength of the Connection is increased and a smoother connection surface is created becomes.
- the pipe material can only be axial Direction (for example from the side of the pipe with less Wall thickness and / or smaller diameter or the tube with larger wall thickness and / or larger diameter) or both axial directions are tracked.
- the tracking from the both axial directions can be the same or advantageous different ways, for example at different speeds and / or staggered and / or over a shorter one or longer distance. Both when tracking out an axial direction as well as from both axial directions when using an outer shape with a groove on its inner surface Fixation of the weld seam of the semi-finished product reached in the axial direction become; however, it is also a corresponding axial tracking possible without such a fixation.
- steel pipes in particular can be used; however, it is also the use of other metals, in particular Light metals, such as magnesium, aluminum or a magnesium or aluminum alloy possible.
- Light metals such as magnesium, aluminum or a magnesium or aluminum alloy possible.
- metal pipes with different material properties be connected, e.g. different types of steel, e.g. Steel grades with different composition or different Structure.
- a first metal tube 1 and a second metal tube 2 used e.g. a circular cross section, a have a rectangular cross section or another cross section.
- the metal tubes 1, 2 have different, as shown in FIG. 1 Wall thicknesses and / or different diameters.
- end regions 3, 4 of the metal tubes are expanded in such a way that that end faces 5, 6 of the end regions 3, 4 are matched to one another and subsequently the metal tubes 1, 2 can be placed against each other at their end faces 5, 6, so that advantageously at least one end face, e.g. as in Fig. 2 shown the smaller end face 5, completely on the other Face 6 rests.
- the end regions 3, 4 have already been expanded in such a way that their cross sections the cross section of the final shape, that is, the later Molded component at this point, at least largely correspond, or their outer diameter the inner diameter of the in used later IHU expansion process, shown in Fig. 3 9 correspond at least largely.
- the pipe ends 3, 4 can be on Fig. 2 following welding process e.g. through a pressure welding process, especially a magnetically controlled arc welding process are welded together.
- a pressure welding process especially a magnetically controlled arc welding process are welded together.
- an electrode welding process can also be used be used, where appropriate, to expand the Pipe ends 3, 4 used expanding mandrel, not shown in Fig. 2 can be used as one of the electrodes.
- connection area 13 which has the end regions 3, 4 as the starting material used metal pipes 1, 2 corresponds.
- a weld 7 which is formed as in Fig. 3 shown can protrude in particular to the outside.
- the semifinished product 8 in a manner known per se inserted into an outer shape 9, which is the final shape of the later tubular Determined component. To expand this is known in Way fluid, as shown by arrow F, inside the Semi-finished product 8 pressed, generally the other end of the Semi-finished product 8 is closed.
- connection area 13 already during the previous expansion area of the outer shape 9 surrounding it is at least largely adapted is and advantageously only a small, ring-shaped Gap 11 between the connection area 13 and the outer shape 9 remains, this connection area in the hydroforming process only slightly stretched, so that in particular also the load on the end region 3 of the metal pipe with less Wall thickness near the weld 7 kept low is so that there is no or only a small amount in the weld seam Voltages are generated.
- the diameter of the metal pipe and the gap is coordinated so that the Elongation of the metal in the radial direction within the flow area of the metal takes place.
- An annular groove 10 can be formed in the outer shape 9, which is suitable for receiving the weld seam 7.
- the weld seam 7 thus enters the groove, so that a flat pressing of the weld 7 on a smooth inner surface the outer shape 9 can be avoided.
- the groove 10 can are so deep that the weld 7 is not at all or only partially comes to rest on the groove base, so that the Load on the weld 7 is low. Alternatively, you can a deliberate deformation of the weld when using a groove can be achieved with a smaller depth, so that the Weld 7 is somewhat flattened.
- the axial length of the end regions changed in their cross section 3, 4 can in the mechanical expansion according to the invention before Welding of the two metal tubes is different his.
- the axial length of the end region 3 of the metal tube 1 with smaller wall thickness larger or smaller chosen as the axial length of the end region 4 of the metal tube 2 are, depending on the desired load on the pipe material at mechanical expansion as well as in the subsequent hydroforming.
- one or both end areas can also be narrowed.
- a first tube with a smaller diameter and one second pipe with a larger diameter can, for example End region of the first tube expanded and the end region of the second tube are narrowed, so that the end regions against each other are adjusted.
- a narrowing of both end areas can, for example be made when the connection area in the later Molded component has a smaller diameter than the surrounding areas of the molded component and for example below the molded component in the relatively flexible connection area should be bent.
- sheet metal can be produced continuously roll-formed or discontinuously roll-rolled or die-bent, relatively inexpensive pipes are used. This can then pulling and annealing the pipes if necessary to be dispensed with because the subsequent widening of the pipe ends according to the invention also larger tolerances of the output pipes can be accepted. This can also weaken the material by pulling and Glow pipes are avoided.
- tubes 1, 2 can be of constant or non-uniform Wall thickness can be used.
- An uneven wall thickness can be done, for example, by pretreatment for pipe manufacturing used sheets can be achieved.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
Description
- Fig. 1 -
- die Endbereiche von zwei Metallrohren vor dem erfindungsgemäßen Aufweiten der Rohre;
- Fig. 2 -
- die aufgeweiteten Rohrenden nach dem erfindungsgemäßen Aufweiten;
- Fig. 3 -
- ein in eine IHU-Form eingelegtes erfindungsgemäßes Halbzeug vor dem hydraulischen Aufweiten gemäß dem erfindungsgemäßen Verfahren.
Claims (18)
- Verfahren zum Herstellen eines Formbauteils, bei dembei mindestens einem Metallrohr von mindestens zwei Metallrohren (1, 2) unterschiedlichen Querschnittes und/oder unterschiedlicher Wandstärke und/oder unterschiedlicher Materialeigenschaften der Querschnitt mindestens eines Endbereiches (3, 4) derartig verändert wird, daß stirnseitige Endflächen (5, 6) der Endbereiche (3, 4) der beiden Metallrohre (1, 2) aneinander angepaßt sind, und die Querschnitte der Endbereiche (3, 4) der Metallrohre (1, 2) Querschnitten einer Endform zumindest im wesentlichen entsprechen,die Metallrohre an den stirnseitigen Endflächen (5, 6) miteinander zu einem rohrförmigen Halbzeug (8) verschweißt werden, unddas rohrförmige Halbzeug (8) nachfolgend zumindest bereichsweise in einem Innenhochdruck-Umformverfahren verformt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass bei beiden Metallrohren (1, 2) jeweils mindestens der Querschnitt eines Endbereiches verändert wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Endbereich (3, 4) mindestens eines Metallrohres, vorzugsweise die Endbereiche (3, 4) beider Metallrohre (1, 2) mechanisch aufgeweitet und/oder verjüngt werden.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass mindestens der Endbereich (3, 4) eines der Metallrohre (1, 2) mittels eines axial eingeführten Aufweitdornes aufgeweitet wird, der während des Verschweißens der stirnseitigen Endflächen (5, 6) in dem Endbereich (3, 4) des Metallrohres verbleibt.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Endbereiche (3, 4) beider Metallrohre (1, 2) durch einen gemeinsamen Aufweitdorn, insbesondere einen gemeinsamen Aufspreizdorn, aufgeweitet werden.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass bei der Veränderung des Querschnittes des mindestens einen Endbereiches (3, 4) die geometrische Form des Querschnittes verändert wird.
- Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Querschnitt des rohrförmigen Halbzeuges (8) in einem Verbindungsbereich (13) der Metallrohre (1, 2) dem Querschnitt einer beim Innenhochdruck-Umformverfahren verwendeten Außenform (9) zumindest im wesentlichen entspricht.
- Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass bei Einlage des rohrförmigen Halbzeuges (8) in die Außenform (9) zwischen dem Verbindungsbereich (13) der Metallrohre und der Außenform (9) ein im wesentlichen gleichmäßiger Spalt (11) ausgebildet ist.
- Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass in einer Endfläche einer beim Innenhochdruck-Umformverfahren verwendeten Außenform (9) eine in Umfangsrichtung verlaufende Nut (10) zur Aufnahme einer Schweißnaht (7) eines Verbindungsbereiches (13) der Metallrohre (1, 2) ausgebildet ist.
- Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass nach dem Verschweißen der stirnseitigen Endflächen (5, 6) der Endbereiche (3, 4) das Halbzeug (8) ohne eine vorherige Nachbearbeitung einer Schweißnaht (7) durch das Innenhochdruck-Umformverfahren verformt wird.
- Verfahren nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass das Halbzeug (8) vor dem Innenhochdruck-Umformverfahren gebogen wird.
- Verfahren nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass die stirnseitigen Endflächen (5, 6) durch ein Pressschweißverfahren, insbesondere ein magnetisch gesteuertes Lichtbogen-Schweißverfahren oder ein Reibschweißverfahren, miteinander verschweißt werden.
- Verfahren nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass während des Innenhochdruck-Umformverfahrens das Halbzeug in mindestens einer axialen Richtung (P), vorzugsweise in zwei entgegengesetzten axialen Richtungen in gleicher oder unterschiedlicher Weise nachgeführt wird.
- Verfahren nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass in einem ersten Verfahrensschritt die Metallrohre aus einem Blech durch ein diskontinuierliches Verfahren, wie z. B. Rollwalzen- oder Gesenkbiegen, oder ein kontinuierliches Verfahren, wie z. B. ein Rollformverfahren, hergestellt werden und ohne ein nachfolgendes Ziehverfahren oder Glühverfahren die Querschnitte ihrer Endbereiche (3, 4) verändert und aneinander angepaßt werden.
- Verfahren nach einem der Ansprüche 1 bis 14, dadurch gekennzeichnet, dass ein Metallrohr oder beide Metallrohre (1, 2) vor dem Verschweißen gebogen wird/werden.
- Rohrförmiges Formbauteil aus Metall, herstellbar mit einem Verfahren nach einem der Ansprüche 1 bis 15, mit mindestens zwei rohrförmigen Abschnitten aus Metall, die über eine Schweißnaht (7) miteinander verbunden sind, wobei die Schweißnaht zumindest weitgehend spannungsfrei ist.
- Rohrförmiges Formbauteil nach Anspruch 16, dadurch gekennzeichnet, dass die Schweißnaht (7) an einem Außenumfang des Formbauteils hervorragt.
- Formbauteil nach Anspruch 16 oder 17, dadurch gekennzeichnet, dass die Abschnitte unterschiedliche Materialeigenschaften aufweisen, vorzugsweise aus unterschiedlichen Metallen bestehen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19962958A DE19962958C2 (de) | 1999-12-24 | 1999-12-24 | Verfahren zum Herstellen eines Formbauteils aus mindestens zwei Metallrohren und danach herstellbares Formbauteil |
DE19962958 | 1999-12-24 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1110637A2 true EP1110637A2 (de) | 2001-06-27 |
EP1110637A3 EP1110637A3 (de) | 2002-01-16 |
EP1110637B1 EP1110637B1 (de) | 2004-03-24 |
Family
ID=7934463
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00127774A Expired - Lifetime EP1110637B1 (de) | 1999-12-24 | 2000-12-19 | Verfahren zum Herstellen eines Formbauteils |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1110637B1 (de) |
AT (1) | ATE262385T1 (de) |
DE (2) | DE19962958C2 (de) |
ES (1) | ES2216809T3 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2854432A1 (fr) * | 2003-04-29 | 2004-11-05 | Faurecia Sys Echappement | Ligne d'echappement pour moteur thermique. |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BRPI0414991B1 (pt) | 2003-10-02 | 2017-05-30 | Behr Gmbh & Co Kg | trocador de calor para automóveis |
DE102005049460B4 (de) * | 2005-10-15 | 2009-01-02 | Daimler Ag | Vorrichtung zum Herstellen eines Zusammenbaus |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5775296A (en) * | 1980-10-29 | 1982-05-11 | Mitsubishi Heavy Ind Ltd | Method for improving residual stress of welded joint part of pipe |
EP0620056A1 (de) * | 1993-04-16 | 1994-10-19 | General Motors Corporation | Verfahren zum Formen eines rohrförmigen Konstruktionsteils |
EP0995533A2 (de) * | 1998-10-08 | 2000-04-26 | Daido Tokushuko Kabushiki Kaisha | Herstellung eines Formkörpers aus Metallrohren |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19735434C1 (de) * | 1997-08-16 | 1998-11-19 | Daimler Benz Ag | Verfahren und eine Einrichtung zur Herstellung eines Hohlkörpers aus zwei aufeinandergelegten Metallplatinen mittels Innenhochdruckumformen |
-
1999
- 1999-12-24 DE DE19962958A patent/DE19962958C2/de not_active Expired - Fee Related
-
2000
- 2000-12-19 AT AT00127774T patent/ATE262385T1/de not_active IP Right Cessation
- 2000-12-19 EP EP00127774A patent/EP1110637B1/de not_active Expired - Lifetime
- 2000-12-19 ES ES00127774T patent/ES2216809T3/es not_active Expired - Lifetime
- 2000-12-19 DE DE50005786T patent/DE50005786D1/de not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5775296A (en) * | 1980-10-29 | 1982-05-11 | Mitsubishi Heavy Ind Ltd | Method for improving residual stress of welded joint part of pipe |
EP0620056A1 (de) * | 1993-04-16 | 1994-10-19 | General Motors Corporation | Verfahren zum Formen eines rohrförmigen Konstruktionsteils |
EP0995533A2 (de) * | 1998-10-08 | 2000-04-26 | Daido Tokushuko Kabushiki Kaisha | Herstellung eines Formkörpers aus Metallrohren |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 006, no. 161 (M-151), 24. August 1982 (1982-08-24) -& JP 57 075296 A (MITSUBISHI HEAVY IND LTD), 11. Mai 1982 (1982-05-11) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2854432A1 (fr) * | 2003-04-29 | 2004-11-05 | Faurecia Sys Echappement | Ligne d'echappement pour moteur thermique. |
Also Published As
Publication number | Publication date |
---|---|
ATE262385T1 (de) | 2004-04-15 |
EP1110637B1 (de) | 2004-03-24 |
DE19962958C2 (de) | 2001-12-13 |
DE19962958A1 (de) | 2001-07-26 |
EP1110637A3 (de) | 2002-01-16 |
DE50005786D1 (de) | 2004-04-29 |
ES2216809T3 (es) | 2004-11-01 |
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