EP2355942B1 - Procédé de formage de profilés creux - Google Patents
Procédé de formage de profilés creux Download PDFInfo
- Publication number
- EP2355942B1 EP2355942B1 EP09736120A EP09736120A EP2355942B1 EP 2355942 B1 EP2355942 B1 EP 2355942B1 EP 09736120 A EP09736120 A EP 09736120A EP 09736120 A EP09736120 A EP 09736120A EP 2355942 B1 EP2355942 B1 EP 2355942B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hollow profile
- insert
- forming
- hollow
- forming device
- 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.)
- Not-in-force
Links
- 238000000034 method Methods 0.000 title claims description 46
- 239000000463 material Substances 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 1
- 239000001993 wax Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 230000008901 benefit Effects 0.000 description 6
- 238000004049 embossing Methods 0.000 description 5
- 238000005336 cracking Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/025—Stamping using rigid devices or tools for tubular articles
-
- 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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/10—Stamping using yieldable or resilient pads
- B21D22/105—Stamping using yieldable or resilient pads of tubular products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
Definitions
- the invention relates to a method for forming hollow sections having at least one opening, wherein in the hollow profile, a fixed insert is placed and the hollow profile is applied externally by the action of a forming device with at least one forming force to achieve a hollow profile end shape and reshaped.
- Hollow sections per se, ie structural elements with a closed, non-massive cross section, has long been known and generally well controlled, for example by extrusion. Hollow sections have - depending on the precise design - a very good ratio between the achieved stiffness of the hollow body, in particular bending and torsional stiffness, and the amount of material used.
- hollow sections with a constant over the longitudinal extent of the profile cross-section are relatively easy to produce, however, often, for example, in the body structure, form requirements made that make a far-reaching transformation of the hollow section required.
- Hollow profiles with constant cross-section, with single or multi-chamber cross-sections require over the deformation of solid bodies of a special, more complex treatment, since in the external action of a forming force on the hollow profile there is a risk of buckling and cracking.
- the hollow profiles often do not accept the desired contour of the tools of the forming in the molding process, on the contrary, even significant deviations from the target contour remain, which is due to constriction and different compression and elongation of the hollow profile material.
- Object of the present invention is to avoid the drawbacks in known methods for forming hollow sections - at least partially - to provide, in particular a method that allows deformation of hollow sections with high dimensional accuracy, in particular without deposits within the reshaped hollow profile remain.
- the indicated object is achieved according to the invention first and essentially in the subject method in that the insert is transferred after and / or upon achievement of the hollow profile end shape at least partially in a liquid and / or gaseous state and substantially completely from the hollow profile Will get removed.
- the insert liquefies after or during the transformation - which also includes a resolution - or is gasified, it is usually readily removable from the formed hollow section and can - depending on the material used - be reused or recycled. If it is mentioned that the insert located in the liquid and / or gaseous state "substantially completely" is removed from the hollow profile, then it is meant that at least a significant proportion of the deposit material is removed from the hollow profile, preferably more than 80%, more preferably more than 90%, most preferably more than 99% of the insert material originally used. Hollow sections frequently have openings at their ends even after a forming process, from which openings the fluid and / or gaseous state can flow out or flow out. If, after the forming of the hollow profile, such an opening is no longer present, in a preferred embodiment of the invention, an opening is introduced into the hollow profile to remove the transferred into a liquid and / or gaseous state deposit.
- the insert is converted into a liquid and / or gaseous state by the insert is heated directly or indirectly via the hollow profile.
- An immediate heating of the insert can for example be ensured by the fact that the insert also a heater - for example in the form of a heating wire - introduced into the hollow section and placed there, the heater is activated to liquefy the insert in retrospect.
- the heating device can either be pulled out of the hollow profile or remain in the hollow profile if the hollow profile has been over-embossed for a distance.
- the indirect heating of the insert over the hollow profile is possible, for example, by the use of thermal radiation or in that the hollow profile is exposed to a heat bath.
- Materials with a lower melting temperature are advantageous in that less energy has to be expended in order to remove them from the hollow profile after the forming process, therefore it is also preferable to use material which a melting temperature more than 60 ° C, more preferably greater than or equal to 40 ° C. If the manufacturing environment allows it, a melting temperature of only greater than 30 ° C. may also be advantageous. Although, in principle, materials can be used whose melting temperatures are below the working temperature, but these are inevitably expensive to handle, since they are in other temperature ranges -. B. climate chamber - must be provided and processed quickly to prevent premature liquefaction.
- wax or a wax-like substance is used as the material for the insert, "wax-like substance” referring in particular to the mechanical properties of wax (viscosity, hardness, toughness), not to the optical properties.
- Waxes have the property that they are plastically deformable under normal conditions - ie under normal atmospheric pressure at about 20 ° C - without cracking or crumbling, but are still relatively dimensionally stable
- most waxes are free of pollutants and therefore manageable even in direct contact with wax, which also has a very significant technical advantage, since it can be used to seal off Surfaces and thus used for corrosion protection Especially in the automotive industry, cavities, in particular cavities in hollow profiles, are sealed by wax for decades.
- the opening of the hollow profile - or the openings - is sealed after introduction of the insert, in particular by embossing and / or by applying or introducing a stamp, for example a stamp of the forming device.
- a stamp for example a stamp of the forming device.
- the volume of the insert is such that it corresponds to the volume of the hollow profile upon reaching the hollow profile end shape.
- the insert acts in the hollow profile not only as a counter-support based on a pure reaction force, but there are during forming areas of the hollow profile in which due to the hollow profile internal pressure exerted a resultant, outwardly directed force on the wall of the hollow profile becomes. Overall, this leads to a much better dimensional accuracy of the resulting formed hollow profile than is the case with hollow sections, which have been produced without such an insert - in particular wax-like insert.
- Another advantage of the method according to the invention is therefore that even - assuming the choice of a suitable material for the deposit, such.
- B. wax - a reshaping of the hollow profile from the inside to the outside with conventional forming devices is possible without having to resort to expensive devices, as used for example in the hydroforming.
- a further advantageous embodiment of the method is that the insert is placed in the hollow profile by the material in the liquid state of the insert is filled in the hollow profile and the material of the insert is cooled to solidification in the insert.
- FIG. 1 and 2 a method for forming hollow sections 1 is shown with at least one opening 2, the Fig. 3 and 4 show process products, hollow sections 1 "in hollow profile final form.
- FIG. 1 shows in an overview, the time course of the actual process can not readily recognize the necessary for carrying out the process elements, namely a fixed insert 3, - present three fixed deposits 3, one insert for each of the three chambers - and a forming device 4a, 4b, wherein the hollow profile Outside by the action of the forming device 4a, 4b applied with a forming force to achieve a Hohlprofilendform and reshaped.
- FIG. 1 the different deformation states of the hollow profile 1 are shown, wherein the unprocessed hollow profile 1 to the hollow profile 1 'closed by sealing points 5, from which finally the hollow profile 1 "in hollow profile final form 4b of the shaping device 4a, 4b are moved toward one another under the action of force and reshape the inserted hollow profile 1.
- the upper tool 4a and the lower tool 4b accordingly have the negative form of the desired hollow profile shape, which should come as close as possible to the hollow profile end shape characterized in that the insert 3 is transferred after and / or upon reaching the Hohlprofilendform the hollow section 1 in a liquid and / or gaseous state and substantially completely removed from the hollow profile 1, which is not explicitly illustrated, but readily understandable ,
- the insert 3 is converted into a liquid state by the insert 3 is indirectly heated via the hollow profile 1, namely, as in Fig. 2g indicated, is exposed to a stream of hot air.
- the indirect heating of the insert 3 via the hollow profile 1 is particularly suitable when the hollow profile 1 consists of a good thermal conductivity material.
- the hollow profile 1 consists of an aluminum alloy, which is highly thermally conductive. This is advantageous in this case, because automatically first the areas of the insert 3 are heated and liquefied, which are responsible for the fact that the insert 3 in the reshaped hollow section 1 "adheres.
- the deformed metallic hollow profile 1 is inductively heated
- the deformed hollow profile 1 is used for the heat treatment hung so that the insert automatically releases by gravity from the hollow profile, as soon as the edge areas have been liquefied enough.
- 3 wax is used as the material for the insert, which has a melting point at about 40 ° C.
- the working temperature at which the process described here is carried out is usually between 18 ° C and 25 ° C, a temperature range at which ordinary wax is readily plastically deformable without cracking or breaking.
- Fig. 2 a nearly complete process flow is shown.
- the insert 3 is placed in the hollow profile 1; the insert is already fixed during the placement.
- the insert or the liquefied material of the insert is introduced into the reshaped hollow profile and cooled only in the hollow section so far that the material of the insert 3 solidifies into a solid insert 3.
- Fig. 2b It is shown that the openings 2 of the hollow profile 1 are sealed after introduction of the insert 3, namely by embossing with stamping dies 6.
- the sealing point 5 is located adjacent to the insert 3 in the hollow section 1 or the insert 3 is already through the Embossing compacted at the sealing points 5 in the hollow section 1.
- the cavity of the hollow profile 1 is almost completely filled with the insert 3.
- the volume of the insert 3 corresponds to the volume of the hollow profile 1 "upon reaching the hollow profile end shape., That means that at the completion of the forming process, the largest internal pressure is generated Volume of the hollow section 1 corresponds, the greatest possible conversion from the inside to the outside can be achieved, since practically at the beginning of the forming process, a considerable hollow profile internal pressure is generated Fig. 2g It can be seen that the end portions 7 of the deformed hollow profile 1 "are separated so that the subsequently liquefied insert 3 can flow out of the formed hollow profile 1". In other, not shown embodiments, smaller openings in the formed hollow section 1 "are introduced to remove the converted into a liquid state insert 3 can.
- Fig. 3 and 4 are compared with the forming results which can be achieved with a conventional non-insert method ( Fig. 3 ) and which can be achieved with the method according to the invention - here with a wax-like insert 3.
- Fig. 3 is good to realize that without the use of an insert no hollow profile internal pressure can be generated, which leads to an unsatisfactory shape, since only embossing contours can me poorly profiled transitions can be achieved; Bulges can not be generated at all, although the forming device provides the necessary space for it.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Claims (11)
- Procédé de formage de profilés creux (1) présentant au moins une ouverture (2), ce procédé consistant à placer un insert solide (3) dans le profilé creux (1) puis à appliquer au moins une force de formage sur l'extérieur du profilé creux (1) et à le former, sous l'action d'un dispositif de formage (4a, 4b), afin d'obtenir une forme finale de profilé creux,
caractérisé en ce qu'on transfère l'insert (3) au moins partiellement à l'état liquide et/ou gazeux après et/ou à l'obtention de la forme finale du profilé creux et on l'évacue du profilé creux (1) sensiblement dans sa totalité. - Procédé selon la revendication 1, caractérisé en ce qu'on transfère l'insert (3) à l'état liquide et/ou gazeux en chauffant l'insert (3) directement ou indirectement, par l'intermédiaire du profilé creux (1).
- Procédé selon la revendication 1 ou 2, caractérisé en ce qu'on utilise pour l'insert (3) un matériau qui présente, à une pression d'un bar (101,3 kPa), une température de fusion supérieure à 80°C, de préférence supérieure à 60°C, d'une manière particulièrement préférée supérieure ou égale à 40°C, d'une manière tout particulièrement préférée supérieure ou égale à 30°C.
- Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'on utilise comme matériau pour l'insert (3) de la cire ou un matériau analogue à la cire, en particulier en ce qui concerne les propriétés mécaniques.
- Procédé selon l'une des revendications 1 à 4, caractérisé en ce que l'ouverture (2) du profilé creux (1) est hermétiquement fermée à la suite de l'introduction de l'insert (3), en particulier par matriçage et/ou par application ou introduction d'un poinçon, sachant notamment que le point de fermeture étanche (5) est situé au voisinage de l'insert (3).
- Procédé selon l'une des revendications 1 à 5, caractérisé en ce que l'insert (3) est au moins partiellement liquéfié et/ou gazéifié par le travail de formage réalisé par le dispositif de formage (4a, 4b).
- Procédé selon l'une des revendications 1 à 6, caractérisé en ce que le volume de l'insert (3) correspond au volume du profilé creux (1) à l'atteinte de la forme finale du profilé creux.
- Procédé selon l'une des revendications 1 à 7, caractérisé en ce qu'on utilise comme dispositif de formage (4) un outil de matriçage (4a, 4b) entourant pour l'essentiel le profilé creux (1), en particulier un outil de matriçage (4a, 4b) avec une matrice supérieure (4a) et une matrice inférieure (4b).
- Procédé selon l'une des revendications 1 à 8, caractérisé en ce que, lors du formage du profilé creux (1) et de l'insert (3) par le dispositif de formage (4a, 4b), on produit une pression intérieure de profilé creux par laquelle le profilé creux (1) est au moins sectoriellement déformé de l'intérieur vers l'extérieur, en particulier par laquelle le matériau de paroi du profilé creux (1) est enfoncé dans au moins une cavité non encore remplie du dispositif de formage (4a, 4b).
- Procédé selon l'une des revendications 1 à 9, caractérisé en ce qu'on pratique dans le profilé creux (1) une ouverture (8) pour l'évacuation de l'insert (3) transféré à l'état liquide et/ou gazeux.
- Procédé selon l'une des revendications 1 à 10, caractérisé en ce qu'on place l'insert (3) dans le profilé creux (1) par le fait que le matériau de l'insert (3) est rempli à l'état liquide dans le profilé creux (1), et le matériau de l'insert (3) est refroidi jusqu'à sa solidification dans le profilé creux (1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200810049245 DE102008049245A1 (de) | 2008-09-26 | 2008-09-26 | Verfahren zur Umformung von Hohlprofilen |
PCT/EP2009/006555 WO2010034406A1 (fr) | 2008-09-26 | 2009-09-10 | Procédé de formage de profilés creux |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2355942A1 EP2355942A1 (fr) | 2011-08-17 |
EP2355942B1 true EP2355942B1 (fr) | 2013-01-16 |
Family
ID=41716347
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09736120A Not-in-force EP2355942B1 (fr) | 2008-09-26 | 2009-09-10 | Procédé de formage de profilés creux |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2355942B1 (fr) |
DE (1) | DE102008049245A1 (fr) |
ES (1) | ES2403115T3 (fr) |
WO (1) | WO2010034406A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014202271A1 (fr) * | 2013-06-17 | 2014-12-24 | Thyssenkrupp Steel Europe Ag | Dispositif pour réaliser au moins dépouille dans un profilé en tôle fendu ou fermé |
US10981206B2 (en) | 2015-06-08 | 2021-04-20 | Constellium-Singen Gmbh | Precision forming of metallic hollow extrusions |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018131967A1 (de) * | 2018-12-12 | 2020-06-18 | Benteler Automobiltechnik Gmbh | Verfahren zum Kalibrieren eines gekrümmten metallischen Hohlkammerprofils |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19819950C2 (de) * | 1997-05-12 | 2001-08-09 | Konrad Schnupp | Umformpresse zum Innenhochdruckumformen und/oder Außenhochdruckumformen |
JPH11173324A (ja) * | 1997-12-12 | 1999-06-29 | Yukiyoshi Murakami | 事務器用軸部材及びその製造方法 |
DE19806855C2 (de) * | 1998-02-19 | 2002-06-27 | Bosch Gmbh Robert | Wischerträger |
DE10013428C1 (de) * | 2000-03-17 | 2001-01-18 | Daimler Chrysler Ag | Verfahren zur Herstellung von doppelwandigen Hohlprofilen mittels Innenhochdruckumformen |
JP4045568B2 (ja) * | 2001-11-14 | 2008-02-13 | 株式会社コーリツ | 中空材外面に凹部を形成する方法とこの方法に用いる芯金 |
DE102005007997B3 (de) * | 2005-02-19 | 2005-12-08 | Tower Automotive Hydroforming Gmbh & Co. Kg | Verfahren und Einrichtung zur Herstellung von Bauteilen |
-
2008
- 2008-09-26 DE DE200810049245 patent/DE102008049245A1/de not_active Withdrawn
-
2009
- 2009-09-10 WO PCT/EP2009/006555 patent/WO2010034406A1/fr active Application Filing
- 2009-09-10 ES ES09736120T patent/ES2403115T3/es active Active
- 2009-09-10 EP EP09736120A patent/EP2355942B1/fr not_active Not-in-force
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014202271A1 (fr) * | 2013-06-17 | 2014-12-24 | Thyssenkrupp Steel Europe Ag | Dispositif pour réaliser au moins dépouille dans un profilé en tôle fendu ou fermé |
KR20160020481A (ko) * | 2013-06-17 | 2016-02-23 | 티센크루프 스틸 유럽 악티엔게젤샤프트 | 슬롯형 또는 폐쇄형 프로파일링된 시트 섹션에서 적어도 하나의 언더컷을 제조하는 디바이스 |
US9895734B2 (en) | 2013-06-17 | 2018-02-20 | Thyssenkrupp Steel Europe Ag | Device for producing at least one undercut in a slotted or closed profiled sheet section |
KR102148556B1 (ko) | 2013-06-17 | 2020-08-26 | 티센크루프 스틸 유럽 악티엔게젤샤프트 | 슬롯형 또는 폐쇄형 프로파일링된 시트 섹션에서 적어도 하나의 언더컷을 제조하는 디바이스 |
US10981206B2 (en) | 2015-06-08 | 2021-04-20 | Constellium-Singen Gmbh | Precision forming of metallic hollow extrusions |
Also Published As
Publication number | Publication date |
---|---|
ES2403115T3 (es) | 2013-05-14 |
EP2355942A1 (fr) | 2011-08-17 |
WO2010034406A1 (fr) | 2010-04-01 |
DE102008049245A1 (de) | 2010-04-01 |
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