WO1998043758A1 - Procede de faconnage de tuyauterie et appareil correspondant - Google Patents

Procede de faconnage de tuyauterie et appareil correspondant Download PDF

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Publication number
WO1998043758A1
WO1998043758A1 PCT/GB1997/000861 GB9700861W WO9843758A1 WO 1998043758 A1 WO1998043758 A1 WO 1998043758A1 GB 9700861 W GB9700861 W GB 9700861W WO 9843758 A1 WO9843758 A1 WO 9843758A1
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WO
WIPO (PCT)
Prior art keywords
die
section
blank
cavity
cross
Prior art date
Application number
PCT/GB1997/000861
Other languages
English (en)
Inventor
Murray R. Mason
Gerrald A. Klages
Original Assignee
T I Corporate Services Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by T I Corporate Services Limited filed Critical T I Corporate Services Limited
Priority to PCT/GB1997/000861 priority Critical patent/WO1998043758A1/fr
Priority to AU21702/97A priority patent/AU2170297A/en
Publication of WO1998043758A1 publication Critical patent/WO1998043758A1/fr

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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
    • B21D26/033—Deforming tubular bodies
    • B21D26/045—Closing or sealing means

Definitions

  • the invention relates to a method and apparatus for forming of tubing.
  • the present invention provides a method of forming a tubular member comprising:
  • said die comprises die sections moving between open, intermediate and closed positions, each die section having a die cavity portion and a mating surface portion, which die sections in the closed position have the mating surface portion of each section in mating engagement with the mating surface portion of each adjacent section on the die cavity portions defining said cavity
  • said step of deforming said end portion of said tubular blank comprises placing the blank between the die sections in the open position, and partially closing the die sections to said intermediate position for deforming said end portion, and wherein said sealing member is inserted into the deformed end before the blank is confined in the die by moving said die sections to the closed position.
  • This procedure provides for efficient forming of the product .
  • an end of the tubular blank is deformed to provide it with an elongated profile.
  • the blank is sealed by applying a sealing member of corresponding profile and the blank is pressurized after sealing to expand it within the confines of the die cavity. The pressure is then released, the sealing member removed and the expanded blank is withdrawn from the die .
  • the profile of the sealed end may be made to match more closely the profile of a final expanded blank and as a result a much shorter transition portion may be employed so that there is considerably less wastage of materials 10 and resources.
  • a transition portion of the cavity has a cross section that varies continuously smoothly between an elongated cross-section of an inner cavity portion and the cross section of the said deformed l ⁇ . end, and the deformed end is elongated in a direction substantially parallel to the direction of elongation of the cross-section of the inner cavity portion.
  • the invention also provides apparatus suitable for use in carrying out the above method.
  • Figure 1 is a side view partly in section of one 25 form of press apparatus for use in expansion forming in accordance with the present invention.
  • Figure 2 is a perspective view of a lower die section of the press of Fig. 1 and a finished expanded frame member lying on the die section.
  • Figure 3 is a partial perspective view, partly in section of one end of the apparatus of Fig. 1.
  • Figure 4 is a somewhat schematic partial isometric view of one end of the upper and lower die sections of the apparatus of Fig. 1 and of the finished frame member.
  • Figure 5 is a longitudinal section through the die sections of Fig. 4 in closed position.
  • Figure 6 is a section on the line 6-6 in Fig. 5.
  • Figure 7 is a front view of the die taken on the arrow 7 in Fig. 5.
  • Figures 8 and 9 are partial side views, partially in section showing successive stages in the forming process.
  • Figure 10 is a cross section on an enlarged scale corresponding to Fig. 9 and illustrating a sealing member and a low pressure filling operation.
  • Figures 11 and 12 are partial cross sectional views on an enlarged scale showing successive stages in the engagement of a seal head within the tube workpiece .
  • Figure 13 is a cross section through the elastomeric sealing portion of the seal head taken on the line 13-13 in Figure 12.
  • Figure 14 is a side view of the press shown in Figures 8 and 9 in a later stage in the forming process.
  • FIG 15 which appears on the same sheet as Figure 13, shows an alternative form of sealing element in accordance with the invention.
  • Figure 16 is a longitudinal cross section corresponding to Figure 12 wherein external sealing of the tube is employed.
  • Figure 1 shows one preferred form of tube expansion apparatus for use in expansion forming carried out on a tubular, preferably circular blank 10.
  • the apparatus comprises a press 11 having a lower, usually fixed portion 12 and an upper portion 13 movable vertically relative to the lower portion 12. Seal heads 14 are provided at each end of the apparatus for sealing the ends of the blank 10 and conducting pressurized liquid to and from the interior of the blank 10.
  • the portions 12 and 13 carry respective lower and upper die cavity portions 16 and 17 which when closed together around the tubular blank 10 form an open-ended die cavity defining the desired shape of the final frame member or other product to be produced by expansion-forming.
  • the apparatus illustrated is suitable for use, for example, in the highly advantageous expansion-forming techniques described in U.S. reissue patent Re 33990 wherein, before closing the die cavity portions 16 and 17 together, the blank 16 is pressurized internally with liquid to a pressure less than the yield limit of the wall of the blank. Subsequently, after closure of the die sections 16 and 17 together, the pressure is increased to above the yield limit of the wall of the blank, so that it expands into prefect conformity with the die cavity.
  • This technique allows high speed forming of high quality, high strength expanded tubular members from inexpensive tube stock materials, as described in more detail in the above Re 33990 patent, the disclosures of which are incorporated herein by reference.
  • the apparatus as illustrated utilizes seal heads 14 similar in many respects to those disclosed in U.S. patent 5,235,836.
  • the sealing elements of the seal heads are provided with a resilient sealing portion of continuously smoothly curved cross sectional profile elongated in a direction corresponding to a direction of elongation of a cross sectional portion of the desired product adjacent its ends.
  • the lower die section 16 is shown in more detail.
  • the shape of the die cavity formed when sections 16 and 17 close together may best be described with reference to a final frame member or other product to be formed by expansion forming of the tubular blank 10.
  • Such final frame member 510 is shown in Figure 2 lying on the lower section 16 ready for removal on completion of the forming cycle. It may be noted that, adjacent each end, the member 510 has a portion 511 that is substantially rectangular with rounded corners.
  • the member 510 is not linear but is bent and twisted so that portions of the member 510 intermediate the portions 511 are similarly generally rectangular although displaced rotationally, and somewhat laterally or vertically with respect to the portions 511.
  • the member Outwardly from each portion 511, the member comprises a transition portion 512 and an outer end portion 513 which is of continuously smoothly curved cross sectional profile elongated in the horizontal directly, parallel to the direction of elongation of the rectangular portion 511.
  • the portion 513 is substantially elliptical, but other continuously smoothly curved elongated cross sectional profiles are contemplated.
  • the starting material tube blank 10 may be elliptical cross section and the portion 513 may be of circular cross section. All portions of the member 510 merge smoothly and continuously with the adjacent portions, so there are no abrupt angularities or discontinuities.
  • transition portion 510 tapers and merges smoothly from portion 511 to outer end portion 513.
  • the upper and lower die sections 16 and 17 are provided with internal and transitional die cavity portions such that, when the sections 16 and 17 close together and the mating surface portions 16a and 16b of the lower die section 16 engage the corresponding mating surface portions 17a and 71b of the upper die section 17, they define together a cavity open at each end and having the shape of the desired final product 510 together with the transition portions 512 and end portions 513 which are normally cut off and discarded after completion of the forming cycle.
  • a portion of such internal cavity portions 18 of the lower die and 19 of the upper die is shown, together with transition cavity portions 21 for the lower die sections 16 and 22 for the upper die sections 17 are shown.
  • the lower, normally fixed die section 16 is provided with a throat cavity portion 23 of semi-elliptical cross section, or other cross section matching the desired profile of the outer end portion 513.
  • each member 24 has on each lateral flank a vertically extending shoulder 26 slidingly retained within vertical guide structure 27 secured to an end face of the moving portion 13.
  • a stop 28 is connected on each side of an upwardly laterally outwardly extending upper portion 29 of the member 24, and limits downward travel of the member 24 to a normal or extended position relative to the portion 13 to the position shown in Figs. 1 and 3 wherein the member 24 extends a distance below the upper die section 17 and stop 28 engages an upper end of the guide structure 27.
  • a series of compression springs 31 react between the upper portion 29 and a bearing plate
  • each clamp member 24 as seen in side view in Figs. 1, 8 and 9 is the length of the throat cavity portion 23 of the lower die section 16 and is similarly formed with a recess 34 of semi- elliptical form or other form matching the desired elongated profile of the outer end portion 513.
  • an internal cavity portion defined by portion 18 and 19 as seen comprises an axially elongated portion of uniform rectangular cross section with rounded corners matching the portion 511 to be formed therein.
  • portion 511 having its sides inclined at a small angle to the directional vector 36, usually vertical, in which the upper and lower die sections 16 and 17 move between their open and closed positions.
  • the split planes defined by the mating surface portions 16a, 16b, 17a and 17b of the die sections 16 and 17 are off-set with respect to one another in the direction of the vector 36. In the example shown, they intersect the sides of the approximately rectangular profile seen in Figure 6 at approximately points of greatest lateral extension of the cavity portions.
  • the throat cavity portion defined by the cavity portions 23 and 34 when clamp member 24 closes on 16 comprises an axially elongated portion of uniform continuously smoothly curved cross sectional profile elongated at approximately right angles to the vector 26, preferably an ellipse having its major axis substantially parallel to the longest dimension or direction of elongation of the approximately rectangular portion shown in Figure 6 and the portion 511 formed therein. From Figure 5, it will be noted that the centre of the elliptical portion is slightly off-set upwardly from the geometric centre of the rectangular portion seen in Figure 6, so that the lower side of the portion 23 is approximately aligned with the lower side of the portion 18, in order to facilitate design of the die cavity portions.
  • the split planes preferably intersect the major axis of the ellipse to facilitate closure of the die and removal of the final part and therefore incline outwardly as seen in Figure 5. It will be appreciated, however, that the axis of the elliptical portion defined between the member 24 and the lower die section 16 may, if desired, be aligned with the centre of the rectangular portion seen in Figure 6.
  • transitional die cavity portion defined by portions 21 and 22 varies continuously smoothly from the approximately rectangular cross sectional portion of
  • each member 14 comprises an internal high pressure sealing portion comprising a hollow shaft 36 which may be elliptical in section or circular as seen in Figure 13 on the inner end of which a shaft abutment member 38 elliptical in section is fixed.
  • An outer sleeve 39 which is preferably elliptical in section as seen in Figure 7 is slidable on the outer side of the shaft 36 and a sleeve abutment member 41 elliptical in section is connected on the inner end of the sleeve 39.
  • a resiliently deformable sealing portion 42 for example of a polyurethane elastomer which may be in the form of a body of uniform thickness if the shaft 36 is elliptical or of a varying thickness as seen in Figure 13.
  • the portion 42 in the uncompressed or relaxed condition as seen in Figure 11 is nested inwardly of the members 38 and 41 for protection against cutting, scoring or the like by contact with a sharp end of the blank 10 to be sealed.
  • An outer end of the shaft 36 is connected through a block 43 as seen in Figure 10 to a line 44 connected through valving to a source of high pressure liquid.
  • the block 43 is connected to • a piston rod 46 of a piston working in a cylinder 47 by means of which the shaft 36 can be reciprocated between the retracted position as shown in Figure 10 and the advanced position as shown in Figure 11.
  • Transversely reciprocable stop members 48 are provided each having a forward abutment surface 49 for engagement with an enlarged rear end 51 of sleeve 39.
  • the inner side of each stop member 48 is provided with a recess 52 providing a rear abutment surface 53 for cooperating with a member 54 threaded or otherwise longitudinally adjustably connected on shaft 36 to limit compression applied to the elastomer portion 42.
  • the sleeve 39 Adjacent its forward end, the sleeve 39 passes slidably through a support 56 on which a cylindrical shroud 57 is connected reciprocably . Compression springs 58 acting between the shroud 57 and the support 56 normally urge the shroud 57 forwardly.
  • the forward end of the shroud is provided with forwardly projecting gasketing 59 for sealing on substantially vertical end faces of the lower die section 16 and the clamp member 24, when engaged together in the position shown in Figure 7.
  • a lower pressure liquid inlet line 61 is connected in one side of the shroud 57 and connects through valving to a pump or other source of liquid capable of delivering liquid at a high volume flow rate under low pressure.
  • An O-ring 62 seals between the shroud 57 and sleeve 39 at the point where the latter enters the rear of the shroud 57.
  • the sleeve abutment member 41 engages an adjacent rear side of the shroud 57 and maintains the shroud 57 in a retracted condition, as seen in Figures 1 and 3, against the action of the compression springs 58.
  • the seal heads 14 at each end of the apparatus as seen in Fig. 1 are of substantially similar construction.
  • a circular section blank 10 is laid on the bottom die section 16.
  • the blank 10 is bent or non-linear to conform to a bent or non-linear shape desired for the final product 510.
  • the procedures that may be used for bending the blank are well known to those skilled in the art and need not be described in detail herein.
  • the portions 12 and 13 are then closed in the direction of the vector 36 to an intermediate position wherein there is a small spacing between the pairs of mating surface portions 16a, 16b and 17a and 17b.
  • the spring rate of the compression springs 32 is such that the resilient reaction provided by the springs 32 is sufficient to clamp the end portions of the blank on the lower die section 16 and to deform the outer end portions of the blank 10 to provide them with the deformed end portions 513 discussed above.
  • clamp members 24 One function of the clamp members 24 is therefore to provide the ends of the blank with the deformed ends elongated substantially in the direction of elongation of the adjacent elongated portions 511. Secondly, the clamp portions locate or retain the bent blank 10 in fixed position on the die section 16. As the die sections 16 and 17 close toward the intermediate position, the blank 10 reacts with inclining surfaces of the die sections 16 and 17 and, if the blank were unrestrained, there would tend to be uncontrolled displacement of the blank relative to the die sections 16 and 17. The clamp members 24 retain the blank 10 so that its ends are retained in a position aligned with the seal heads 14 in a position to receive the sleeve 39 and shaft 36 when extended in the direction of their axes.
  • the clamp members 24 retain the blank 10 so that it is compressed and deformed in controlled fashion between the die sections 16 and 17 as they close to the intermediate position.
  • the mating surface portions 24a and 24b at each end mate on the upper side of the mating portions 16a and 16b of the lower die section, as seen in Figure 8.
  • the small spacing above referred to is preferably about 10 to about 25%, for example about 14% of the diameter of the cylindrical tubular blank 10.
  • the compression of the blank 10 between the die sections 16 and 17 in its intermediate portions may tend to deform intermediate portions, where these are engaged between die cavity portions forming transversely elongated approximately rectangular profiles into approximately hour glass section portions, as shown in broken lines at 63 in Figure 6.
  • the valving is operated to close the vent and to close the line 61 through which the blank 10 was filled with low pressure liquid.
  • the piston 46 in the seal head at each end is then extended to move the shaft 36 from the position of Figure 10 to the positions shown in Figure 11 wherein the shafts 36 enter the deformed end portions 513.
  • the stop members 48 are then closed laterally inwardly, and the piston 46 together with the shaft 36 retracted to the position seen in Figure 12.
  • Liquid is then pumped through the line 44, at one or the other of the seal heads 14, which is in communication with the sealed interior of the blank through the hollow bore in the shaft 36 to pre-pressurize the interior of the blank sufficiently to prevent the wall of the blank 10 extending outwardly beyond the envelope of the die cavity formed between the die sections 16 and 17 when fully closed together, as described in more detail in the above mentioned U.S. reissue patent Re 33990.
  • the blank 10 is gripped and clamped tightly between the die sections 16 and 17 so that any tendency for bent blanks 10 to straighten out as a result of the internal pressurization is resisted.
  • this pre-pressurization is about 300 to about 1000 psi. This pressurization is below the yield limit of the wall 10 of the blank.
  • clamp members 24 are to resist outward deformation of the wall of the deformed end 513 of the blank 10 under the pressure exerted by the expanding sealing portion 42, to avoid bulging which may result in leaks of liquid from the blank 10 and loss of pressurization.
  • the sections 12 and 13 are then moved to a fully closed position, indicated in Figure 14. In this position, the mating surfaces 16a and 16b and 17a and 17b of the lower and upper sections 16 and 17 close fully together.
  • the clamp member 24 is urged further upwardly relative to the upper portion 13 against the action of the compression springs 32 while its lower surfaces 24a and 24b remain in contact with the upper side of the die section 16.
  • the or each inlet line 44 may be connected to relief valving to avoid the compression of the blank 10 during the closing movement resulting in pressures internally of the blank which may exceed the yield limit.
  • the or each line 44 may be disconnected from the relief valve and one or both of them is connected to a source of high pressurization, so that sufficient pressurization is applied to the liquid in the interior of the blank 10 to cause it to exceed the yield limit of the wall of the blank 10, so that the wall commences to permanently swell or expand radially outwardly until the blank is formed into a product 510 in full conformity with the die cavity formed between the die sections 16 and 17.
  • This full pressurization is accompanied by a small flow of liquid in through the line 44.
  • clamp members 24 a further function of the clamp members 24 is to withstand the forces exerted on the end 513 of the blank adjacent the sealing portion 42 during full pressurization so that leakage of liquid and depressurization does not occur.
  • the spring rates of the springs 32 should, of course, be sufficient to enable all the above-noted functions.
  • the pressurization of the liquid on the inside of the blank 510 is then relieved, the stop members 48 opened outwardly to the position shown in Figure 10, and the piston retracted to the position shown in Figure 10 allowing draining of the interior of the blank 10 through one low pressure line 61, while the other may be connected to the atmosphere or to a blower to allow air to displace the liquid within the blank.
  • the piston 46 is then retracted further, to retract the shroud 57 away from the ends of the clamp members 24 and lower die section 16, and the press open fully to the position of Figure 1 to allow removal of the fully formed part 510 from between the portions 12 and 13.
  • the above cycle of operation may proceed very rapidly, so that high rates of production are possible.
  • the lower die section 16 is provided with a number of bores 64 lined with bushings 66 and offset laterally and preferably staggered longitudinally on each side of the die cavity in the section 16.
  • the upper die section 17 is provided with corresponding dowels 67 which enter the bushings 66 as the sections move from the open to the intermediate positions, and resist forces tending to deflect the lower and upper sections 16 and 17 laterally with respect to one another as a result of reaction between the blank 10 and the laterally inclining surfaces of the die cavity portions.
  • the circumference of the starting material blank 10 is such that the circumference of the final product frame member 510 at any point is no greater than about 5% larger than the circumference of the starting material blank 10.
  • the material of the wall of the blank At least with the readily available grades of tubular steel, if the blank is expanded in circumference by more than about 5%, there is a tendency for the material of the wall of the blank to excessively weaken or crack. While expansion of the tube circumference of up to about 20% can be tolerated if the metal of the tube 10 is fully annealed, it is preferred to conduct the present method without employing special pretreatments of the material of the blank 10, such as annealing.
  • the product 510 is formed, at all cross-sections, with a profile with a circumference which is uniform, and is slightly larger than the starting blank plus its maximum tolerance.
  • the product 510 may typically be expanded up to about 0.4 to about 2% larger than the nominal circumference of the blank. All references to percentage expansions herein are based on the nominal circumference of the starting material blank 10.
  • the deformation of the end portion 513 of the blank 10 between the clamp members 24 and the corresponding portions of the lower die sections 16 provide the end portion 513 with a smoothly continuously curved cross-sectional profile so that the sealing portion 42 can adapt sealingly to the inner surface of the end portion 513 and the seal can be maintained during the steps of compression, pressurization and expansion of the blank 10.
  • the transitional portion 512 may be made relatively short, for example about 60% shorter than transitional portions required when a circular section sealing rather than the elongated profile sealing section member 42 is employed. Since, normally, the portions 512 and 513 of the product 510 will be cut off in order to provide a final rectangular section product 510, the reduction in length of the- transitional portion 512 provides a considerable saving in materials and resources.
  • the direction of elongation of the outer portion 513 need not be exactly aligned with the inner portion 511.
  • the respective directions of elongation are within about 20°, more preferably about 10° of one another.
  • the continuously smoothly curved sealing member 42 need not be, but it preferably is, entirely convex.
  • it may have one or more concave portions and may, for example, be of generally hour glass shape as shown in the member 142 of Figure 15 wherein reference numerals indicated by 100 indicate parts similar to the sealing member of Figure 13.
  • the board shaft 36 are replaced by a pair of bored shafts 136 and a pair of sleeves 139 displaceable in the axial direction to compress the sealing portion 142 between an hour glass section sleeve abutment member 141 and a correspondingly shaped shaft abutment member (not seen in Figure 15) .
  • the clamp member cavity portion 34 and the outer throat cavity portion 23 of the lower die section 16 may be formed to define, when closed together a corresponding hour glass section, so that, in the initial stage of closure of the press portions 12 and 13 together, the outer end portion of the tubular blank 10 is formed to an hour glass section instead of the elliptical section 513.
  • sealing portion 42 and outer throat portion 513 are substantially elliptical.
  • the profile need not conform exactly to a geometrical ellipse, however, and any smoothly rounded generally elongated profile may be employed.
  • the sealing members 14 may be modified so that the resilient sealing portion is applied on the outside of a tubular blank.
  • portions similar to the sealing head 14 are indicated by like reference numerals raised by 200. It is believed the structure and functioning of the sealing member 214 will be readily apparent from Figure 16 taken together with the detailed description of the internal high pressure sealing arrangement described above with reference to Figures 10 to 12. Briefly, it may be noted that retraction of the sleeve 239 and abutment member 241 cause compression of the elastomer portion 242 to cause this to expand radially inwardly to seal on the outer side of the end portion of the blank 10.
  • the outer end may be predeformed in a forming die or the like to form it to a desired elongated cross -sectional profile which matches an adjacent elongated profile of the desired expanded product as well as an elongated cross-sectional profile of the elastomer portion 242.
  • the seal portion 242 may be, for example, substantially elliptical or it may be of other smoothly curved elongated cross-sectional profile, and are disposed substantially parallel to the direction of elongation of an inner die cavity portion defined by the section 16 and 17.
  • a clamp member 24 similar to that described above may initially clamp the end portion of the tubular blank 10 to retain it in position while the sealing member 214 is applied and the blank 10 pressurized.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

On façonne un élément d'ossature (510) à partir d'une ébauche tubulaire (10) dans une cavité de matrice à sections (18, 19) possédant une partie interne (513) et une partie externe de transition (21, 22). Une partie d'extrémité externe (513) de l'ébauche tubulaire (10) est déformée par fermeture partielle des éléments de la matrice avant fermeture totale desdits éléments et façonnage sous pression de l'élément d'ossature (510).
PCT/GB1997/000861 1997-03-27 1997-03-27 Procede de faconnage de tuyauterie et appareil correspondant WO1998043758A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/GB1997/000861 WO1998043758A1 (fr) 1997-03-27 1997-03-27 Procede de faconnage de tuyauterie et appareil correspondant
AU21702/97A AU2170297A (en) 1997-03-27 1997-03-27 Method and apparatus for forming of tubing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB1997/000861 WO1998043758A1 (fr) 1997-03-27 1997-03-27 Procede de faconnage de tuyauterie et appareil correspondant

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WO1998043758A1 true WO1998043758A1 (fr) 1998-10-08

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10323738B3 (de) * 2003-05-24 2004-11-18 Daimlerchrysler Ag Verfahren zur Herstellung eines umfänglich geschlossenen Hohlprofils
WO2005056211A1 (fr) * 2003-12-13 2005-06-23 Daimlerchrysler Ag Dispositif de façonnage par application d'une haute pression interne

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH385146A (de) * 1961-06-22 1964-12-15 Sulzer Ag Verfahren und Vorrichtung zur kalten Formung von Hohlprofilkörpern
JPS57165134A (en) * 1981-04-03 1982-10-12 Hitachi Ltd Hydraulic bulge working device
US4567743A (en) * 1985-03-19 1986-02-04 Standard Tube Canada Inc. Method of forming box-section frame members
JPS63220929A (ja) * 1987-03-09 1988-09-14 Mazda Motor Corp パイプの液圧バルジ成形方法
US5233854A (en) * 1992-05-11 1993-08-10 General Motors Corporation Press apparatus for hydroforming a tube
US5321964A (en) * 1993-06-04 1994-06-21 General Motors Corporation External seal device for tube hydroforming
US5357774A (en) * 1990-03-06 1994-10-25 Klages Gerrald A Seal head for tube expansion apparatus
US5644829A (en) * 1993-08-16 1997-07-08 T I Corporate Services Limited Method for expansion forming of tubing

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH385146A (de) * 1961-06-22 1964-12-15 Sulzer Ag Verfahren und Vorrichtung zur kalten Formung von Hohlprofilkörpern
JPS57165134A (en) * 1981-04-03 1982-10-12 Hitachi Ltd Hydraulic bulge working device
US4567743A (en) * 1985-03-19 1986-02-04 Standard Tube Canada Inc. Method of forming box-section frame members
JPS63220929A (ja) * 1987-03-09 1988-09-14 Mazda Motor Corp パイプの液圧バルジ成形方法
US5357774A (en) * 1990-03-06 1994-10-25 Klages Gerrald A Seal head for tube expansion apparatus
US5233854A (en) * 1992-05-11 1993-08-10 General Motors Corporation Press apparatus for hydroforming a tube
US5321964A (en) * 1993-06-04 1994-06-21 General Motors Corporation External seal device for tube hydroforming
US5644829A (en) * 1993-08-16 1997-07-08 T I Corporate Services Limited Method for expansion forming of tubing

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 005 (M - 184) 11 January 1983 (1983-01-11) *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 010 (M - 782) 11 January 1989 (1989-01-11) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10323738B3 (de) * 2003-05-24 2004-11-18 Daimlerchrysler Ag Verfahren zur Herstellung eines umfänglich geschlossenen Hohlprofils
WO2004103602A1 (fr) * 2003-05-24 2004-12-02 Daimlerchrysler Ag Procede de fabrication d'un profile creux ferme peripheriquement
WO2005056211A1 (fr) * 2003-12-13 2005-06-23 Daimlerchrysler Ag Dispositif de façonnage par application d'une haute pression interne

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Publication number Publication date
AU2170297A (en) 1998-10-22

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