WO2000033988A2 - Procede et dispositif d'hydroformage d'un element tubulaire - Google Patents
Procede et dispositif d'hydroformage d'un element tubulaire Download PDFInfo
- Publication number
- WO2000033988A2 WO2000033988A2 PCT/BE1999/000158 BE9900158W WO0033988A2 WO 2000033988 A2 WO2000033988 A2 WO 2000033988A2 BE 9900158 W BE9900158 W BE 9900158W WO 0033988 A2 WO0033988 A2 WO 0033988A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tubular element
- core
- hydroforming
- matrix
- elementary
- Prior art date
Links
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
- B21D26/033—Deforming tubular bodies
- B21D26/047—Mould construction
-
- 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
- B21D26/033—Deforming tubular bodies
- B21D26/039—Means for controlling the clamping or opening of the moulds
Definitions
- the subject of the present invention is a method and a device for hydroforming a tubular element, more particularly an essentially rectilinear tubular element.
- Hydroforming techniques are well known and are meeting with increasing success due to the fact that they make it possible, in a single step, to produce complex shapes from a blank in the form of a tubular element.
- the suitably sealed blank is held in a matrix made up of two half-shells of suitable shape, and subjected to hydroforming by injection of fluid under high pressure into the blank while the matrix is kept closed using a press. .
- the object of the present invention is to allow the use of hydroforming techniques for the production, from tubular elements, of essentially rectilinear hydroformed elements, without requiring the use of significant material in order to maintain the matrix in the closed state. It also aims to allow the production by hydroforming, in one step, of long pieces.
- the process of the invention which consists in a hydroforming process in which a hydroforming fluid is injected under pressure into a rectilinear tubular element which is also made waterproof and received in a matrix made up of two half appropriately shaped shells, held together to resist the hydroforming forces transmitted by the tubular element, to produce the matrix in the form of a series of elementary matrices, succeeding each other juxtaposed along the tubular element, in the longitudinal direction of the latter, to assemble each elementary matrix individually using retaining members, to retain the elementary matrices in a position juxtaposed in the longitudinal direction by a longitudinal blocking carried out on either side of the matrix, and to maintain each elementary matrix assembled by the reaction forces generated during hydroforming in the assembly c considered.
- the elementary matrices are retained in the juxtaposed position by clamping all of said elementary matrices between clamping means provided at the two ends of a bar constituting the core, axially passing through said tubular element.
- the hydroforming fluid is injected into the tubular element through the bar constituting the core, and the sealing of the ends of the tubular element on the core is produced, at each end of the core, by clamping the corresponding end of the tubular element between said end of the core and the corresponding axial clamping means.
- the ends of the tubular element are constricted on the corresponding ends of the core, before the tightening of the corresponding axial clamping means.
- the invention also relates to a device for hydroforming a straight tubular element of the type comprising a matrix consisting of two half-shells of appropriate shape, held assembled to resist hydroforming forces, a bar, constituting its part central an oblong core intended to be inserted into the tubular element to be subjected to hydroforming, core whose length corresponds substantially to the length of said tubular element, and at each end of the bar, means for sealing the ends of the tubular element, device which comprises, for carrying out the method of the invention, elementary matrices juxtaposed along the tubular element, forming the matrix, means of individual assembly of each elementary matrix, self-locking under the effect hydroforming forces, and at each end of the bar, fixing means for axial clamping means, the means ns of axial clamping cooperating, on either side of the end walls of the matrix consisting of juxtaposed elementary matrices, with said fixing means, and the sealing means cooperating with the ends of the core.
- an assembly constituting an elementary matrix consists of two half-matrices, the ends of which are formed to constitute, by their union, when the elementary matrix is closed, pins intended to cooperate with corresponding mortises formed in locking parts.
- the tenons and the corresponding mortises have a slight taper, sufficient to facilitate the introduction of the tenon into the mortise, but sufficiently reduced to allow a blocking such that the friction forces oppose on the expulsion, during hydroforming, of the locking piece in which is formed the mortise.
- an assembly constituting an elementary matrix consists of two assemblies of half-matrices, juxtaposed so that the closing plane of one of the assemblies is arranged at right angles relative to the closure plane of the other assembly, and assembled by studs parallel to the axis of the elementary matrix thus formed, arranged on either side of each of the closure planes of the assemblies and fitting into corresponding housings of assemblies.
- the bar comprises a cylindrical core, of diameter slightly smaller than the internal diameter of the tubular element and of length corresponding substantially to the length of the tubular element to be hydroformed, core which is connects at each of its ends, by a conical shoulder, to a threaded end, while the clamping means consist, at each end, of a nut screwing onto the threaded end of the bar and of a plate thrust pierced with a conical orifice to cooperate with the conical shoulder of the bar, and that at least one end of the bar is formed, through the threaded end, a fluid supply duct d hydroforming which leads to the surface of the nucleus.
- a straight shoulder of small height is formed between the core and the conical shoulder.
- FIG. 2 is a perspective view of another embodiment of an assembly constituting an elementary matrix, adapted to the constitution in the tubular element of an assembly form
- FIG. 3 is a detail view, partially in section, of one end of a core bar and of the associated tightening device in FIG. 4 is an overall view, in section, of a hydroforming device according to the invention of a tubular element as mentioned above, the supply of hydroforming fluid not being shown
- FIG. .5 is a partial view of a grid produced from a hydroformed tubular element according to the invention.
- a hydroforming device according to the invention of a straight tubular member consists of a matrix 1, a bar 2 constituting a core axially passing through a blank or tubular element 3 to be hydroformed, and clamping means 4, 4 '.
- the matrix 1 consists according to the invention of a series of assemblies 5, 6 forming elementary matrices. These various components will be described in more detail below, with reference to Figures 1, 2 and 3.
- FIG. 1 illustrates an assembly 5 constituting an elementary matrix, suitable for maintaining the part concerned of a tubular element in its initial shape.
- Such an assembly 5 consists of two partial assemblies 7, 7 'juxtaposed with half dies 8, 8' respectively 8 ", 8"'each having a housing 9 respectively 9' intended to receive the tubular element, and a closure 10, respectively 10 '.
- the partial assemblies 7, 7 ' are juxtaposed so that the closure plane 10 of the partial assembly 7 is arranged at right angles to the closure plane 10' of the partial assembly 7 '.
- the partial assemblies 7, 7 ′ are joined together in the form of an assembly 5 by studs 11 inserted in the housings 12 so as to be arranged parallel to the axis 13 of the elementary matrix thus formed.
- Fig. 2 illustrates an assembly 6 constituting an elementary matrix, comprising a recess 14 suitable for producing an assembly form 15 of grid bars.
- This assembly consists of two half-dies 16, 16 ', extending into semi-circular section projections 17, 17' respectively 17 “, 17"', oriented perpendicular to the axis 13' of the elementary matrix thus formed .
- These projections of semi-circular section are designed to form by their meeting 17, 17 "respectively 17 ', 17"', a tenon of circular section intended to cooperate each time with a corresponding mortise 18 in a locking piece 19.
- a single locking piece 19 with mortise 18, intended to cooperate with the tenon formed from the ends 17 ', 17 "', is shown in the drawing.
- the tenons formed by the union of the projections 17, 17 "and 17 ', 17"', and the corresponding mortises 18, have a slight taper.
- a taper of 1% is considered to be a sufficient taper to facilitate the introduction of the post into the mortise, while allowing, under the effect of friction forces, a blocking of the post in the mortise during 1 hydroforming.
- Fig. 3 shows a detailed view, partially in section, of the end of a bar 2 and associated tightening means 4, cooperating with the blank or tubular element 3.
- the bar 2 proper consists of a cylindrical body 19, constituting the core, with a diameter slightly smaller than the internal diameter of the tubular element 3 in order to allow a ring-shaped space of reduced size to remain between the core 19 and the tubular element 3. This makes it possible on the one hand to limit the quantity of fluid necessary for hydroforming, and on the other hand to limit the surface for applying pressure generating in the tubular element 3 the axial component of the forces.
- the cylindrical body 19 is connected, by a frustoconical shoulder 20, to a threaded end 21 intended to cooperate with the clamping means 4.
- clamping means 4 consist of a part 22 constituting a nut, acting on a clamping plate 23
- the clamping plate 23 is pierced with an orifice 24 for engaging on the threaded end 21 of the bar 2, orifice 24 ending in a frustoconical part 25 of conicity corresponding to that of the shoulder 20.
- the shoulder 20 has a straight portion 26 of small dimension making a transition between the cylindrical core 19 and the frustoconical portion of the shoulder 20.
- a supply channel 27 for the hydroforming fluid crosses the threaded end 21 to result in the surface of the core 19.
- a grid bar 28 (see fig. 5) is inserted into the tubular element 3 constituting a blank, cut to suitable length, the bar 2, of length provided to correspond to a determined assembly of elementary dies 5, 6.
- the ends 29 of the tubular element 3 are constricted on the frustoconical shoulder 20 at each end of the bar 2.
- the elementary dies 5, 6 are put in place and assembled, and the clamping means 4 are put in place.
- the pushing of the nut 22 on the clamping plate 23 ensures both the maintenance in juxtaposed position of the elementary dies and the sealing of the annular space remaining between the tubular element 3 and the cylindrical body 19 of the core 2.
- This sealing is ensured by the cooperation of the shoulder 20 and the frustoconical orifice 25 to crush the constricted part 29 of the tubular element 3.
- the straight part 26 of the shoulder 20 promotes this sealing by constituting a corner to penetrate into the constricted part 29.
- the hydroforming fluid is then brought through the conduit 27 into the annular space remaining between the core 19 and the tubular element 3.
- the tubular element 3 deforms in line with the recesses 14, the shape generated being determined to use the material available at the right of the deformation without contribution from the neighboring zones.
- use will preferably be made, for the production of these grid elements, of stainless steel blanks.
- the elementary dies 6 are locked in the closed position by the tendency to expansion of the tenons 17, 17 "and 17 ', 17"' in the corresponding mortises 18. From the same way, the elementary matrices 5 are locked in the closed position by the constraints perpendicular to the axis of the studs 11, exerted in two directions perpendicular to each other to the passage of the stud considered in the partial assembly 7 respectively in the partial assembly 7 '.
- the clamping means 4 are loosened, the assemblies of elementary dies released and the ends of the hydroformed bar 28 cut to allow the withdrawal of the bar 2.
- This hydroformed bar can then be machined in a suitable manner to produce in the assembly forms 15 the cutouts required to allow the introduction and the welding of cylindrical bars 30 with a view to constituting a grid.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99957778A EP1144139B1 (fr) | 1998-12-09 | 1999-12-07 | Procede et dispositif d'hydroformage d'un element tubulaire |
AT99957778T ATE226857T1 (de) | 1998-12-09 | 1999-12-07 | Verfahren und vorrichtung zur hochdruckformung eines rohrförmigen rohlings |
DE69903754T DE69903754D1 (de) | 1998-12-09 | 1999-12-07 | Verfahren und vorrichtung zur hochdruckformung eines rohrförmigen rohlings |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE9800885 | 1998-12-09 | ||
BE9800885A BE1012328A3 (fr) | 1998-12-09 | 1998-12-09 | Procede et dispositif d'hydroformage d'un element tubulaire. |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2000033988A2 true WO2000033988A2 (fr) | 2000-06-15 |
WO2000033988A3 WO2000033988A3 (fr) | 2000-10-19 |
Family
ID=3891562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BE1999/000158 WO2000033988A2 (fr) | 1998-12-09 | 1999-12-07 | Procede et dispositif d'hydroformage d'un element tubulaire |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1144139B1 (fr) |
AT (1) | ATE226857T1 (fr) |
BE (1) | BE1012328A3 (fr) |
DE (1) | DE69903754D1 (fr) |
WO (1) | WO2000033988A2 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106734492A (zh) * | 2016-11-14 | 2017-05-31 | 南昌航空大学 | 一种带内筋的形状记忆合金管接头液压扩径装置 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR601296A (fr) * | 1925-07-24 | 1926-02-26 | Procédé et appareil pour la fabrication d'objets métalliques | |
GB392635A (en) * | 1931-12-02 | 1933-05-25 | Alexander James Middler | A method of forming outward projections on the walls of hollow forgings or tubes |
GB523962A (en) * | 1939-01-18 | 1940-07-26 | John William Edward Bettles | Improvements in tubular metal fencing standards |
GB947546A (en) * | 1961-03-02 | 1964-01-22 | Monoweld Engineering Company P | Improvements in or relating to the shaping of hollow metal articles |
GB2299959A (en) * | 1995-04-20 | 1996-10-23 | Raymond Pace | Method and apparatus for forming a stanchion |
DE19622372A1 (de) * | 1996-06-04 | 1997-12-11 | Meleghy Gmbh & Co Kg | Verfahren und Vorrichtung zum Herstellen von Nockenwellen |
-
1998
- 1998-12-09 BE BE9800885A patent/BE1012328A3/fr not_active IP Right Cessation
-
1999
- 1999-12-07 AT AT99957778T patent/ATE226857T1/de not_active IP Right Cessation
- 1999-12-07 EP EP99957778A patent/EP1144139B1/fr not_active Expired - Lifetime
- 1999-12-07 WO PCT/BE1999/000158 patent/WO2000033988A2/fr active IP Right Grant
- 1999-12-07 DE DE69903754T patent/DE69903754D1/de not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR601296A (fr) * | 1925-07-24 | 1926-02-26 | Procédé et appareil pour la fabrication d'objets métalliques | |
GB392635A (en) * | 1931-12-02 | 1933-05-25 | Alexander James Middler | A method of forming outward projections on the walls of hollow forgings or tubes |
GB523962A (en) * | 1939-01-18 | 1940-07-26 | John William Edward Bettles | Improvements in tubular metal fencing standards |
GB947546A (en) * | 1961-03-02 | 1964-01-22 | Monoweld Engineering Company P | Improvements in or relating to the shaping of hollow metal articles |
GB2299959A (en) * | 1995-04-20 | 1996-10-23 | Raymond Pace | Method and apparatus for forming a stanchion |
DE19622372A1 (de) * | 1996-06-04 | 1997-12-11 | Meleghy Gmbh & Co Kg | Verfahren und Vorrichtung zum Herstellen von Nockenwellen |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106734492A (zh) * | 2016-11-14 | 2017-05-31 | 南昌航空大学 | 一种带内筋的形状记忆合金管接头液压扩径装置 |
Also Published As
Publication number | Publication date |
---|---|
ATE226857T1 (de) | 2002-11-15 |
EP1144139A2 (fr) | 2001-10-17 |
WO2000033988A3 (fr) | 2000-10-19 |
EP1144139B1 (fr) | 2002-10-30 |
DE69903754D1 (de) | 2002-12-05 |
BE1012328A3 (fr) | 2000-09-05 |
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