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EP1663539A1 - Installation de formage a pression interieure elevee - Google Patents

Installation de formage a pression interieure elevee

Info

Publication number
EP1663539A1
EP1663539A1 EP04764318A EP04764318A EP1663539A1 EP 1663539 A1 EP1663539 A1 EP 1663539A1 EP 04764318 A EP04764318 A EP 04764318A EP 04764318 A EP04764318 A EP 04764318A EP 1663539 A1 EP1663539 A1 EP 1663539A1
Authority
EP
European Patent Office
Prior art keywords
filling
axial
attachment
hollow profile
forming tool
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.)
Withdrawn
Application number
EP04764318A
Other languages
German (de)
English (en)
Inventor
Helmut Augustin
Kai-Uwe Dudziak
Stefan Schwarz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
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 DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1663539A1 publication Critical patent/EP1663539A1/fr
Withdrawn legal-status Critical Current

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
    • B21D26/045—Closing or sealing means
    • 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
    • B21D26/043—Means for controlling the axial pusher

Definitions

  • the invention relates to a hydroforming system according to the preamble of patent claim 1.
  • a generic high-pressure forming system is known from DE 196 286 88 Cl. There, an internal high-pressure forming system is described, which contains a quick filling device for filling a hollow profile, which is inserted in the engraving formed by the upper and lower part of the forming tool of the system, with pressurized fluid.
  • the quick filling device is formed by two filling attachments, which are mounted opposite one another on the outside of the forming tool.
  • the filling attachments have a through hole into which an axial plunger is immersed, by means of which the profile inserted into the forming tool is to be sealed at both ends. While one filling attachment has a filling bore that opens into the through bore, the other filling attachment has an outlet bore, through which the pressure fluid can escape after complete filling.
  • the filling process is as follows: The axial ram is in a position withdrawn from its sealing position, in which the mouth of the filling hole in the through hole is released. Now a pressure fluid Pipe, which is connected to a water reservoir and in which, if necessary, a pressure fluid pump is integrated, the pressure fluid is conveyed via the filling hole into the through hole and from there into the interior of the hollow profile. Since the cross-sectional opening of the filling hole is significantly larger than the axial through-channel within the axial plunger, by means of which an internal high pressure can be generated in the hollow profile, the pressure fluid does not enter the hollow profile in a high-energy jet, but rather such a large volume of pressure fluid is introduced that the Hollow profile is flooded. This quickly and completely displaces the air in the hollow profile, which escapes through the outlet bore of the other filling attachment.
  • the axial rams are driven so that they completely penetrate the filling attachments and seal the ends of the hollow profile.
  • the mouth of the filling hole of one filling attachment and the opening of the outlet hole of the other filling attachment are blocked by the axial rams. If the shaping of the hollow profile and thus its expansion by means of the internal high pressure has now ended, the pressure fluid is released and the stamps are pulled out of the filling attachments.
  • the filling attachments attached to the forming tool are then removed so that the forming tool can open. Finally, the finished hollow profile is removed from the forming tool.
  • the object of the invention is to further develop a generic system in such a way that the mass production suitability of producing hollow high-pressure molded hollow profiles is achieved in a simple manner, for which a quick filling device integrated in the system is used to fill the hollow profile.
  • the filling attachment can now be brought to the forming tool in a simple manner by means of the transport device and can be held there during the filling process, the device bringing the filling attachment into a position remote from the forming tool again after filling.
  • the effort for feeding and withdrawing the filling attachment requires only little effort and requires only a short transport and positioning time.
  • fully programmed controlled handling devices such as robots are conceivable. Since the filling attachment is not attached to the forming tool, after the shaping of the hollow profile has been completed, it can be opened almost immediately afterwards and the finished shaped hollow profile can be removed from it and loaded with a new hollow profile that is yet to be shaped.
  • the axial ram forms the transport device, the mounting attachment being arranged on the latter so that it can be displaced in the axial direction relative to the latter. Due to the use of the axial stamp as a transport device, the structure of the entire internal high-pressure forming system is considerably simplified, since the transport function is taken over by already existing components of the system.
  • the base and the axial plunger are designed to be relatively displaceable relative to one another in the axial direction.
  • the foot attachment is designed in the manner of a bell. Due to the particularly large cross-section, the interior of the bell, which is open to the forming tool, allows a relatively wide range of hollow profiles of different sizes to be flooded quickly, although it is also advantageous in terms of equipment that only a single attachment for many hollow profiles of different diameters can now be used . Furthermore, several filling bores, which are formed in the wall of the filling attachment, can also open into the voluminous interior of the bell, so that the large interior of the bell, in particular can be quickly filled with pressurized fluid, which consequently shortens the filling time of the hollow profile.
  • the axial ram has a stop near the forming tool.
  • the system contains a device with which the filling attachment is held on the forming tool during filling. What is achieved by the device is that the foot attachment is fixed on the outside of the forming tool when the axial punch moves up to it. Depending on the holding force, this leads to a more or less strong sealing of the filling attachment on the forming tool.
  • the stop which has a counter-stop on the side of the filling attachment facing the forming tool, acts as a driving element for the filling attachment when the expansion of the hollow profile has ended and the axial plunger is in its retraction movement.
  • the filling attachment can lift off the forming tool without sliding down from the axial punch.
  • the axial punch when the filling attachment is placed on the forming tool during the filling process is in a position withdrawn from the forming tool and still has a sufficient displacement path towards the forming tool so that it can move into the hollow profile in a sealing manner in the forming phase.
  • the axial ram is surrounded by a hollow ram which can be controlled independently of the axial ram and which acts on the filling attachment with a contact pressure at least during the time of filling.
  • movable pins are also conceivable which act in the same way as the hollow punch on the back of the filling attachment and press it against the outside of the forming tool during the filling process.
  • the attachment of the foot attachment it is conceivable on the forming tool that, such as a latching device, are arranged on this means, into which the foot attachment can plunge and lock there when docking.
  • this can be done by a suitable control of the locking device or in a simple manner by the retraction movement of the axial stem, in which case the fitting attachment rests on the stop of the axial stamp near the forming tool, after exceeding a certain locking force from the locking device disengages.
  • the device for holding the filling attachment on the forming tool is a compression spring, by means of which the rigid attachment attachment; is supported on the outside on a radially outward shoulder of the axial ram.
  • the use of the compression spring greatly simplifies the rapid filling device and thus the internal high-pressure forming system, since the compression spring does not require a separate control on the one hand and can be positioned on the axial ram in a very simple manner on the other hand.
  • the compression spring effectively presses the foot attachment against the forming tool and the stop of the axial ram near the forming tool.
  • the compression spring In the sealing movement of the axial plunger, the compression spring also results in a particularly strong seal, since the spring force is compressed in the sealing movement of the Axial ram increases and the contact pressure of the filling attachment on the forming tool is extremely increased. After the hollow profile has been reshaped, the axial force of the axial ram, which it needs for sealing, is released, which relieves the pressure on the compression spring. As a result, the compression spring spreads out, thereby facilitating the release of the axial plunger from the hollow profile, since it may be jammed there due to a metallic seal with the end of the hollow profile by pressing it outward due to its relaxation.
  • a circumferential seal is arranged on the end face of the filling attachment facing the forming tool.
  • the seal which is preferably designed as an elastomer ring, on the one hand protects the end face of the filling attachment and the contact surface of the forming tool from wear and on the other hand prevents a filling leakage during the filling process.
  • the fitting attachment is a flexible bellows which is attached to the axial ram in the area of the through hole.
  • the bellows is attached to the axial ram, the flexibility of the bellows allows the axial ram to be displaced in the axial direction relative to the bellows for sealing purposes, the bellows being pressed in by the axial ram in the sealing movement. Due to its otherwise fixed arrangement on the axial punch, the bellows is pressed against the outside of the forming tool in a simple manner from the axial movement of the axial punch as it approaches the forming tool. Other pressing or stopping devices for the filling attachment on the forming tool, as are required for a rigid design of the filling attachment, can be dispensed with here in a simple manner.
  • the bellows Due to the elasticity of the bellows, no ne sealing agent on the front side of the bellows when contacting the forming tool because the corresponding sealing elements are formed by the bellows itself.
  • the bellows also has resilience properties which return the axial plunger to its non-use state after the hollow profile has been reshaped and the drive side has been relieved. Here, the bellows also returns to its non-pressed shape. Thus, no separate means for returning the axial plunger to its non-use position are necessary here either.
  • the fitting attachment has a vent hole.
  • the vent hole is advantageously arranged above the tool engraving in the footing attachment.
  • the foot attachment has a drain hole.
  • the drain hole is located in a geodetically lower section of the filling attachment and is blocked during the filling process.
  • the drain hole serves the purpose that after the hollow profile has been reshaped and the axial plunger has been withdrawn from the hollow profile, the pressure fluid located in the hollow profile and the attachment can be removed in a targeted manner. As a result, pressure fluid resources can be saved.
  • FIG. 1 shows a partial longitudinal longitudinal section of an internal high-pressure forming system according to the invention with a forming tool and a quick filling device with a feed attachment that can be relatively displaced on an axial ram of the system
  • Fig. 2 In a lateral longitudinal section, a section of an internal high-pressure forming system according to the invention with a quick filling device and a forming tool with a filling attachment of the quick filling device designed as an elastic bellows and fastened to an axial ram of the system.
  • FIG. 1 shows an internal high-pressure forming system 1, which contains a forming tool 2, which is composed of an upper die 3 and a lower die 4.
  • the engravings 5 of the upper die 3 and of the lower die 4 form a molding space 6 for a circumferentially closed hollow profile 7 that is already inserted therein.
  • the internal high-pressure forming system 1 also has at least one axial punch 8, by means of which the inserted hollow profile 7 at one end 9 is sealable and has an axial through channel 10.
  • the through-channel 10 is connected on the rear side of the axial plunger 8 to a high-pressure fluid generating system, so that in the use position of the axial plunger 8, an internal high-pressure with pressurized fluid can be generated via the through-duct 10 in the hollow profile 7 to expand it.
  • the internal high-pressure forming system 1 also contains a rapid filling device 11, which includes trained filling attachment 12, which has in its wall a filling bore 13, the diameter of which is larger than the diameter of the through-channel 10 of the axial stem 8.
  • the filling bore 13 is used to press the hollow profile 7 with pressurized fluid in the position withdrawn from the respective hollow profile end 9
  • the BefuUvorsatz 12 has a through hole 14, which extends through the axial punch 8 during the forming process of the hollow profile 7.
  • the filling attachment 12 is connected to a transport device which brings the filling attachment 12 into a contact position on the forming tool 2 for filling and, after filling, leads it into a position remote from the forming tool.
  • the transport device is formed by the axial ram 8 itself, the BefuUvorsatz 12 with its through hole 14 on the axial ram 8 being arranged so as to be displaceable in the axial direction relative to the latter.
  • the base attachment 12 can also have any other shape instead of a bell shape, it being advantageous for a quick air-bubble-free filling if the base attachment 12 has a voluminous interior 15, as shown here.
  • the footing attachment can be made of steel, plastic, a light metal or other suitable building materials.
  • the fitting attachment 12 has a guide collar 16, which is hammered into the interior 15, for guiding the axial plunger 8.
  • a circumferential seal 18 in the form of an O-ring is arranged on the end face 17 of the filling attachment 12 facing the forming tool 2.
  • a ventilation bore 19 for discharging the interior nenraum 15 of the filling attachment 12 and air located in the hollow section 7 is formed.
  • a drain hole 20 is formed in it, to which a drain line can be connected and via which, after the hollow profile 7 has been deformed, the pressure fluid can be drained from the latter and the interior 15 of the filling attachment 12.
  • the axial ram 8 which also protrudes into the interior 15 of the filling attachment 12 in its non-use position, has a stop 21 in the form of a hard material ring, which is fastened to the outer surface of the axial ram 8, following the guide collar 16 of the filling attachment 12.
  • the internal high-pressure forming system 1 also contains a device by means of which the rigid filling attachment 12 is held on the forming tool 2 during filling. This device, which can be based on mechanical or hydraulic principles of action, is formed here by a compression spring 22, by means of which the rigid fitting attachment 12 is supported with its outside 23 on a radially outwardly extending shoulder 24 of the axial plunger 8.
  • a hollow profile 7 is first inserted into the engraving 5 of the forming tool 2, after which it is closed.
  • the axial ram 8 now moves towards the forming tool 2 until the fitting attachment 12 of the end face 17 bears against the forming tool 2.
  • the axial ram is shifted a short distance further in the direction of the forming tool 2, whereby the compression spring 22 is somewhat compressed, so that the fitting attachment 12 is pressed against the forming tool 2 by the spring force F D.
  • a pressure fluid is introduced via a fluid line from a fluid reservoir through the filling bore 13 and the interior 15 of the filling attachment 12 into the hollow profile interior 25, whereby the hollow profile 7 is flooded.
  • the axial punch 8 dips with its punch head 26 into the end 9 of the hollow profile 7 and seals it against the internal high pressure to be generated. Furthermore, the fluid high-pressure generation system is started, which introduces high-pressure pressure fluid through the through-channel 10 into the hollow profile interior 25, so that the hollow profile 7 is expanded until it engages with the engraving 5.
  • the pressure fluid is now released and the drive of the axial plunger 8 is relieved.
  • the compression spring 22 expands in the axial direction and presses the axial plunger 8 back into its non-use position.
  • the axial punch 8 is retracted until the BefuUvorsatz 12 lifts from the forming tool 2 and this then for removing the hollow profile 7, which now is finished, is opened.
  • the drain hole 20 is opened, after which the pressure fluid collected in the hollow profile 7 and in the interior 15 of the filling attachment 12 can be drained off in a targeted manner.
  • the filling attachment 12 is designed as an elastic, flexible bellows 27.
  • the bellows 27, which is also bell-shaped, is firmly connected to the axial punch 8 in the area of the through hole 14. This can be done, for example, by gluing, soldering or injection, and by clamping, preferably using a clamping ring.
  • the bellows 27 also has a rigid filling sleeve 28, in which the through hole 14 is formed and which has filling holes 29 on the top and bottom.
  • the filling sleeve 28 is surrounded by the flexible part of the bellows 27 in the middle.
  • the filling sleeve 28 serves the purpose of making it easier to connect fluid lines due to its rigid design.
  • the axial punch 8 is moved in the direction of the forming tool 2 until the bellows 27 rests on the outside of the forming tool 2.
  • the axial ram 8 is displaced a short distance further in the direction of the forming tool 2, as a result of which the bellows 27 is pressed in a little, but is preloaded due to its elasticity, so that the prestressing force is converted into a pressing force of the filling attachment 12 is implemented on the forming tool 2.
  • the interior 15 of the bellows 27 is then filled with pressure fluid via the filling sleeve 28 or its filling holes 29, which automatically flows further into the hollow profile 7 and floods it.
  • the alternative of air discharge described in the previous embodiment is also conceivable here.
  • the axial punch 8 is pre-processed until its punch head 26 dips into the end 9 of the hollow profile 7 and seals the hollow profile 7 in the process.
  • the bellows 27 is pressed in even more and the contact pressure of the filling attachment on the forming tool 2 is thereby increased considerably.
  • the shaping or expansion of the hollow profile 7 begins until it engages the engraving 5 of the forming tool 2.
  • the axial plunger 8 is relieved, after which it is returned to its non-use position by the resilience of the elastic bellows 27.
  • the bellows 27 finally lifts off the forming tool 2, after which it can be opened and the hollow profile 7 can be removed.

Landscapes

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

Abstract

L'invention concerne une installation de formage à pression intérieure élevée (1) comportant un outil de formage (2) constitué d'une matrice supérieure (3) et d'une matrice inférieure (4) dont les gravures (5) forment une chambre de formage (6) pour un profilé creux, fermé au niveau de sa périphérie, à introduire dans ladite chambre. Cette installation (1) présente au moins un poinçon axial (8) permettant d'étanchéifier le profilé creux (7) au niveau d'une extrémité (9) et comportant un canal de passage axial (10), par l'intermédiaire duquel une pression intérieure élevée peut être produite au moyen d'un fluide de pression dans le profilé creux (7) pour élargir ce dernier. Cette installation (1) présente en outre un dispositif de remplissage rapide (11) qui comporte un adaptateur de remplissage (12) pourvu d'un orifice de remplissage (13), (29) dont le diamètre est supérieur à celui du canal de passage (10) du poinçon axial (8) et par l'intermédiaire duquel le profilé creux (7) peut être rempli de fluide de pression, lorsque le poinçon axial (8) est retiré de l'extrémité (9) du profilé creux. L'adaptateur de remplissage (12) présente un orifice de passage (14) à travers lequel pénètre le poinçon axial (8) pendant le formage du profilé creux (7). L'objectif de l'invention est de permettre de produire facilement en grande série des profilés creux par formage à pression intérieure élevée, au moyen d'un dispositif de remplissage rapide (11) intégré dans l'installation (1), servant au remplissage du profilé creux (7). A cet effet, l'adaptateur de remplissage (12) est raccordé à un dispositif de transport qui, pour permettre le remplissage, place ce dernier dans une position de contact avec l'outil de formage (2), et qui, une fois le remplissage effectué, le place dans une position éloignée de l'outil de formage.
EP04764318A 2003-09-23 2004-08-20 Installation de formage a pression interieure elevee Withdrawn EP1663539A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10343868A DE10343868B3 (de) 2003-09-23 2003-09-23 Innenhochdruckumformanlage
PCT/EP2004/009334 WO2005035162A1 (fr) 2003-09-23 2004-08-20 Installation de formage a pression interieure elevee

Publications (1)

Publication Number Publication Date
EP1663539A1 true EP1663539A1 (fr) 2006-06-07

Family

ID=32842345

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04764318A Withdrawn EP1663539A1 (fr) 2003-09-23 2004-08-20 Installation de formage a pression interieure elevee

Country Status (5)

Country Link
US (1) US20070166428A1 (fr)
EP (1) EP1663539A1 (fr)
CA (1) CA2540063A1 (fr)
DE (1) DE10343868B3 (fr)
WO (1) WO2005035162A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103313808B (zh) * 2011-01-24 2015-09-09 Posco公司 使用液压成型来制造大口径产品的装置和方法
ITUA20162257A1 (it) * 2016-04-01 2017-10-01 Bertini Macch S R L Macchina per la formatura e per la sagomatura di un tubolare metallico, come un tubo
DE102017216278A1 (de) 2017-09-14 2019-03-14 Bayerische Motoren Werke Aktiengesellschaft Werkzeug und Verfahren zum Innenhochdruckumformen mit verkürzter Taktzeit
CN112605220A (zh) * 2020-11-27 2021-04-06 四川航天长征装备制造有限公司 一种大径厚比超薄管材充液压弯模具组及成型方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5235836A (en) * 1990-03-06 1993-08-17 Ti Corporate Services Limited Seal head for tube expansion apparatus
US5233856A (en) * 1992-05-29 1993-08-10 General Motors Corporation External seal unit for tube hydroforming
US5445002A (en) * 1993-08-16 1995-08-29 Ti Corporate Services Limited Fill and pressurization apparatus
DE19628688C1 (de) * 1996-07-17 1997-11-20 Siempelkamp Pressen Sys Gmbh Umformpresse für die Innenhochdruckumformung von hohlen Rohlingen
DE19715593C2 (de) * 1997-04-15 1999-05-20 Siempelkamp Pressen Sys Gmbh Verfahren zum Betrieb einer Umformpresse für die Innenhochdruckumformung und Umformpresse zur Durchführung des Verfahrens
US6279364B1 (en) * 1999-02-16 2001-08-28 Gary E. Morphy Sealing method and press apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005035162A1 *

Also Published As

Publication number Publication date
DE10343868B3 (de) 2004-09-09
CA2540063A1 (fr) 2005-04-21
US20070166428A1 (en) 2007-07-19
WO2005035162A1 (fr) 2005-04-21

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