EP0826440B1 - Apparatus for forming metal sections - Google Patents
Apparatus for forming metal sections Download PDFInfo
- Publication number
- EP0826440B1 EP0826440B1 EP97401964A EP97401964A EP0826440B1 EP 0826440 B1 EP0826440 B1 EP 0826440B1 EP 97401964 A EP97401964 A EP 97401964A EP 97401964 A EP97401964 A EP 97401964A EP 0826440 B1 EP0826440 B1 EP 0826440B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- profile
- mandrel
- bending
- punch member
- jaws
- 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.)
- Expired - Lifetime
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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
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- 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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/15—Bending tubes using mandrels or the like using filling material of indefinite shape, e.g. sand, plastic material
-
- 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
- B21D26/047—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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length
-
- 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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/08—Bending tubes using mandrels or the like in press brakes or between rams and anvils or abutments; Pliers with forming dies
Definitions
- said part filling in elastic material is in two parts distinct, touching end to end once introduced in the profile, each part of said piece of filling with a channel opening to a single end and being blind at the opposite end, the end where the channel opens out being linked to a metal insert of jaw tightening and hydraulic pressure supply and equipped with a means of connection to means hydraulic pressurization, said metal insert penetrating into the corresponding end of the profile.
- each part 20 A (20 B) of the filling part 20 is hollowed out with a blind channel 21 at one end and opening at the other.
- it is equipped with means 23 for connection to a circuit hydraulics including 24 regulation and a pump hydraulic 25 ( Figures 2 and 3).
- a counterform 15 with a recess 26 we have shown a counterform 15 with a recess 26.
- hydraulic pressure P is sent, ensuring expansion of the filling part 20 and the plating of the profile 6 against the surfaces of the channel formed by form 3 and the platform 15 closed against each other.
- Figure 7 is a section along VII-VII of the figure 6 but before the pressurization of the part 20 by the channel 21 while in FIG. 6 the filling part 20 is shown in expanded condition and the profile 6 plated against the walls of the canal.
- An advantage of using the coin filling 20 for securing the profile 6 against the walls of its channel-shaped housing consists of that the profile does not need to be cleaned after its installation in shape since it is not in contact with the hydro-forming liquid, the two parts 20 A and 20 B of the piece of filling being waterproof.
- the pressurization of channel 21 can be carried out at will before, simultaneously or successively with a drawing operation by the jaws 4.5 by means of the jacks 6.7.
- Figures 8 and 9, respectively equivalent to Figures 6 and 7 show the case of bending and forming of a section 6 with open section.
- This variant can in particular be used when the profile 1 to be formed is short in length.
- the elastic filling part 20 is in one only part.
- the effort F can be carried out only by a single end, in which case the other end is closed by a metal insert for clamping the jaws 4, solid, without piston tail hole, filler piece leaning directly against this insert.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Description
La présente invention concerne un équipement pour le formage de profilés métalliques, selon le préambule de la revendication 1.The present invention relates to equipment for forming metal profiles according to the preamble of claim 1.
Pour la mise en forme de profilés métalliques, on
connaít le formage par étirage qui permet d'obtenir une
meilleure précision que le simple cintrage conventionnel. On
peut par exemple obtenir une précision de plus ou moins 1 mm
par le formage par étirage contre plus ou moins 5 mm pour le
cintrage conventionnel.For the shaping of metal profiles, we
knows the stretch forming which allows to obtain a
better precision than simple conventional bending. We
can for example obtain an accuracy of plus or minus 1 mm
by stretching against plus or
Pour l'obtention de déformations locales d'un profilé on connaít également le procédé d'hydroformage qui permet d'obtenir une très bonne précision de plus ou moins 0,2 mm et consistant à enfermer le profilé dans une coquille présentant des cavités adéquates et à envoyer dans le profilé un liquide sous forte pression de façon à faire épouser au profilé les formes internes de la coquille. Si le profilé doit en outre être cintré, il est nécessaire, préalablement, d'effectuer cette opération de cintrage, par cintrage conventionnel ou par formage par étirage. L'hydroformage qui utilise un fluide hydraulique généralement huileux nécessite un nettoyage ultérieur du profilé.For obtaining local deformations of a profile we also know the hydroforming process which allows obtain very good accuracy of plus or minus 0.2 mm and consisting in enclosing the profile in a shell with adequate cavities and to send in the profiled a liquid under high pressure so as to make conform to the profile of the internal shapes of the shell. If the profile must also be bent, it is necessary, beforehand, to carry out this bending operation, by conventional bending or by stretch forming. Hydroforming using hydraulic fluid generally oily requires subsequent cleaning of the profile.
La présente invention a pour but de proposer un équipement qui permet d'effectuer sur une machine de formage par étirage, non seulement l'opération de cintrage du profilé mais également une opération d'hydroformage et ceci successivement ou simultanément et sans nécessiter de nettoyage ultérieur du profilé.The object of the present invention is to provide a equipment that performs on a forming machine by stretching, not only the bending operation of the streamlined but also a hydroforming operation and this successively or simultaneously and without requiring subsequent cleaning of the profile.
L'invention a ainsi pour objet un équipement pour le formage de profilés métalliques sur une machine à cintrer par étirage sur laquelle un profilé à former est pris à ses extrémités par des mors liés à des vérins d'étirage et à des moyens de cintrage contre une forme convexe fixée sur une table porte-outils de la machine, caractérisé en ce qu'il comprend une contre-forme et des moyens pour l'appliquer contre ladite forme une fois le profilé cintré contre la forme, une pièce de remplissage en matériau élastique étant prévue pour être placée à l'intérieur dudit profilé et des moyens étant prévus pour soumettre ladite pièce de remplissage à une pression-expansion de manière à ce qu'elle applique fortement le profilé contre les surfaces internes de la forme et de la contre-forme fermées l'une contre l'autre.The invention therefore relates to equipment for forming of metal profiles on a bending machine by stretching on which a profile to be formed is taken at its ends by jaws linked to drawing cylinders and to bending means against a convex shape fixed on a machine tool table, characterized in that it includes a counterform and means for applying it against said shape once the profile is bent against form, a filling piece of elastic material being intended to be placed inside said profile and means being provided for subjecting said piece of filling at a pressure-expansion so that it strongly apply the profile against internal surfaces of closed form and counter-form one against the other.
Selon une première forme de réalisation, ladite pièce de remplissage en matériau élastique est en deux parties distinctes, se touchant bout à bout une fois introduites dans le profilé, chaque partie de ladite pièce de remplissage comportant un canal débouchant à une seule extrémité et étant borgne à l'extrémité opposée, l'extrémité où le canal débouche étant lié à un insert métallique de serrage des mors et d'alimentation en pression hydraulique et équipé d'un moyen de raccordement à des moyens hydrauliques de mise en pression, ledit insert métallique pénétrant dans l'extrémité correspondante du profilé.According to a first embodiment, said part filling in elastic material is in two parts distinct, touching end to end once introduced in the profile, each part of said piece of filling with a channel opening to a single end and being blind at the opposite end, the end where the channel opens out being linked to a metal insert of jaw tightening and hydraulic pressure supply and equipped with a means of connection to means hydraulic pressurization, said metal insert penetrating into the corresponding end of the profile.
Selon une seconde forme de réalisation, lesdits moyens pour soumettre la pièce de remplissage à une pression-expansion comprend un piston de compression usiné au profil intérieure du profilé et soumis à une poussée F par un moyen quelconque.According to a second embodiment, said means to subject the filling part to pressure-expansion includes a compression piston machined to the profile inside of the profile and subjected to a thrust F by a means any.
On va maintenant donner la description d'un exemple de mise en oeuvre de l'invention en se reportant au dessin annexé dans lequel :We will now give the description of an example of implementation of the invention with reference to the drawing annexed in which:
La figure 1 est une vue schématique de face montrant une machine à cintrer par étirage comportant l'équipement selon l'invention.Figure 1 is a schematic front view showing a stretch bending machine with the equipment according to the invention.
La figure 2 est une vue de dessus de la figure 1.Figure 2 is a top view of Figure 1.
La figure 3 est une vue de dessus de la figure 1 mais dans la position où, contrairement à la figure 2, le cintrage est effectué et la contre-forme étant appliquée contre la forme. Figure 3 is a top view of Figure 1 but in the position where, unlike Figure 2, the bending is carried out and the counter-form being applied against form.
La figure 4 est une vue partielle agrandie montrant le profilé cintré contre la forme avec la contre-forme en position fermée contre la forme.Figure 4 is an enlarged partial view showing the profile bent against the form with the counter-form closed position against the form.
La figure 5 est la même que la figure 3 mais avec la pièce de remplissage dans son état compressé-expansé par le moyen d'un fluide hydraulique.Figure 5 is the same as Figure 3 but with the filling part in its compressed-expanded state by the using hydraulic fluid.
La figure 6 montre en vue partielle agrandie, en coupe, une extrémité de l'équipement, dans le cas du formage d'un profilé à section fermée.Figure 6 shows an enlarged partial view, in cutting, one end of the equipment, in the case of forming of a closed section profile.
La figure 7 est une coupe selon VII-VII de la figure 6.Figure 7 is a section along VII-VII of the figure 6.
La figure 8 est similaire à la figure 6 mais dans le cas du formage d'un profilé à section ouverte.Figure 8 is similar to Figure 6 but in the case of forming an open section profile.
La figure 9 est une coupe selon XI-XI de la figure 8.Figure 9 is a section along XI-XI of Figure 8.
La figure 10 est similaire à la figure 6 mais dans le cas où le moyen de mise en compression-expansion de la pièce de remplissage est effectué par un piston.Figure 10 is similar to Figure 6 but in the case where the compression-expansion means of the part filling is carried out by a piston.
En se reportant aux figures 1 et 2, on voit une
machine à cintrer des profilés. Cette machine comporte
classiquement un bâti 1 comprenant une table porte-outils 1
sur laquelle on vient fixer une forme 3 de profil convexe
correspondant au cintrage à obtenir, deux mors de serrage 4,
5 du profilé 6 à cintrer, liés à des vérins d'étirage 7, 8
permettant d'exercer un effort de traction sur le profilé 6
pendant son enroulement autour de la forme 3, les vérins 7,
8 étant eux-mêmes liés à deux bras 9, 10 pivotant autour
d'axes 11, 12 reliés à des vérins 13, 14 et assurant
l'enroulement du profilé 6 contre la forme convexe 3.
Conformément à l'invention, la machine comporte un
équipement permettant d'effectuer une opération
d'hydroformage sur la même machine et ceci simultanément ou
non avec une opération d'étirage par les vérins d'étirage 7,
8, de façon à combiner les contraintes d'expansion et
d'allongement dans le matériau du profilé à former.Referring to Figures 1 and 2, we see a
profile bending machine. This machine has
conventionally a frame 1 comprising a tool table 1
on which we just fix a
Cet équipement comprend d'abord une contre-forme 15
avec des vérins 16, 17 pour appliquer cette contre-forme 15
contre la forme 3 lorsque le profilé est cintré contre la
forme, comme le montre la figure 3. Des clavettes 18,
19 (figure 6 et 7) permettent de verrouiller la contre-forme
15 sur la forme 3 comme le montre la figure 7, la forme et
la contre-forme sont usinés au profil du profilé 6. Ces deux
outils : forme et contre-forme devant constituer, lorsqu'ils
sont en position fermée (figure 3, 4, 5, 7) un canal
épousant les contours extérieurs de la pièce finale à
obtenir, augmentée, dans le sens de sa longueur, des
surlongueurs minimales nécessaires à la coupe et à
l'étanchéité des extrémités, et corrigés pour tenir compte
des différents retours élastiques du matériau constitutif du
profilé à former lorsqu'il revient de sa forme sous
contraintes à la forme finale souhaitée sans contraintes
externes.This equipment first includes a
La forme et la contre-forme peuvent chacune être
faites en une ou plusieurs parties. La forme 3 de cintrage
peut notamment avoir un contour non uniquement convexe mais
avoir un ou plusieurs point d'inflexion. Dans ce cas, bien
entendu, on utilise la contre-forme 15 pour faire épouser au
profilé 6 la courbure de la forme dans ses parties concaves.The form and the counter-form can each be
do it in one or more parts.
L'équipement comprend encore une pièce de remplissage
20 en matériau élastique, visible sur les figures 4, 5, 6, 7
et constituée en deux parties 20 A, 20 B dans cette forme de
réalisation correspondant à ces figures.The equipment also includes a
Cette pièce de remplissage 20, en deux parties 20 A et
20 B, est introduite dans le profilé dès avant le cintrage
et assure, lors du cintrage, un support pour les parties
externes du profilé non au contact de la forme 3.This filling
Par ailleurs, de façon à faire épouser par le profilé
6, les contours internes de la forme et de la contre-forme
fermées et verrouillées l'une contre l'autre, l'équipement
comprend des moyens pour comprimer-expanser la pièce de
remplissage 20.In addition, so as to marry by the
Dans la réalisation correspondant aux figures 4 à 7 et
aussi aux figures 8 et 9, on utilise une pression
hydraulique. Pour cela, chaque partie 20 A (20 B) de la
pièce de remplissage 20 est creusée d'un canal 21 borgne à
une extrémité et débouchant à l'autre. L'extrémité où le
canal débouche est liée à un insert métallique 22 qui
pénètre dans l'extrémité correspondante du profilé et permet
le serrage des mors 4, 5 et assure l'alimentation
hydraulique. A cet effet, comme on le voit figure 6, il est
équipé d'un moyen 23 de raccordement à un circuit
hydraulique comprenant une régulation 24 et une pompe
hydraulique 25 (figure 2 et 3). Sur la figure 4, on a montré
une contre-forme 15 avec un évidement 26. Sur la figure 5,
une pression hydraulique P est envoyée, assurant l'expansion
de la pièce de remplissage 20 et le placage du profilé 6
contre les surfaces du canal formé par la forme 3 et la
contre-forme 15 fermées l'une contre l'autre.In the embodiment corresponding to FIGS. 4 to 7 and
also in figures 8 and 9, a pressure is used
hydraulic. For this, each
Cet évidement 26 permettant d'effectuer dans le
profilé 6 une déformation locale par la mise en pression-expansion
de la pièce de remplissage 20 en matériau
élastique peut également être effectué dans la forme 3. En
outre, l'évidement peut être tel que ladite pression-expansion
provoque le découpage par cisaillement de trous ou
de toute la circonférence du profilé, par exemple pour
détacher les extrémités tenues par les mors, de la partie
centrale constituant la pièce finie.This recess 26 making it possible to carry out in the
La figure 7 est une section selon VII-VII de la figure
6 mais avant la mise sous pression de la pièce 20 par le
canal 21 alors que sur la figure 6 la pièce de remplissage
20 est représentée en état expansé et le profilé 6 plaqué
contre les parois du canal.Figure 7 is a section along VII-VII of the figure
6 but before the pressurization of the
Dans ces figures 4 à 7, le profilé 6 à cintrer et
former est de section fermée comme on le voit bien figure 7.In these figures 4 to 7, the
Un avantage de l'utilisation de la pièce de
remplissage 20 pour assurer le placage du profilé 6 contre
les parois de son logement en forme de canal, consiste en ce
que le profilé n'a pas besoin d'être nettoyé après sa mise
en forme puisqu'il n'est pas au contact du liquide d'hydro-formage,
les deux parties 20 A et 20 B de la pièce de
remplissage étant étanches.An advantage of using the coin
filling 20 for securing the
La figure 6 montre que l'on peut effectuer dans le
profilé 6 des déformations concaves au moyen de poinçons
tels que 27, la pièce de remplissage élastique 20 jouant
alors le rôle de coussin d'emboutissage.Figure 6 shows that one can perform in the
La mise sous pression du canal 21 peut s'effectuer à
volonté préalablement, simultanément ou successivement avec
une opération d'étirage par les mors 4,5 au moyen des vérins
6,7.The pressurization of
Les figures 8 et 9, équivalentes respectivement aux
figures 6 et 7, montrent le cas du cintrage et du formage
d'un profilé 6 à section ouverte.Figures 8 and 9, respectively equivalent to
Figures 6 and 7 show the case of bending and forming
of a
La figure 10 montre une variante dans laquelle la
pression-expansion de la pièce de remplissage 20 est
effectuée, non pas par pression hydraulique, mais par le
moyen d'un piston de compression 28 usiné au profil
intérieur du profilé. Ce piston s'appuie directement contre
la pièce de remplissage élastique 20 et il comporte une
queue 29 traversant un insert métallique 30 servant au
serrage des mors 5. La compression-expansion est assurée par
le moyen d'un effort de poussée F exercée sur le piston 28
par un moyen connu quelconque.Figure 10 shows a variant in which the
pressure-expansion of the
Cette variante peut notamment être utilisée lorsque le
profilé 1 à former est de courte longueur. Dans cette
variante, la pièce de remplissage élastique 20 est en une
seule partie. L'effort F peut ne s'effectuer que par une
seule extrémité, auquel cas, l'autre extrémité est fermée
par un insert métallique de serrage des mors 4, pleins, sans
trou de passage de queue de piston, la pièce de remplissage
s'appuyant directement contre cet insert.This variant can in particular be used when the
profile 1 to be formed is short in length. In this
variant, the
La pièce de remplissage élastique 20 est par exemple
en élastomère tel que du polyuréthanne. Selon l'épaisseur du
profilé, la pression hydraulique envoyée peut être comprise
entre quelques dizaines de bars et quelques milliers de
bars.The
Claims (4)
- Equipment for forming metal profiles (6) on a stretch-bending machine on which a profile to be formed is held at its ends by jaws (4,5) connected to stretching rams (7,8) and to means (9, 10, 13, 14) for bending it against a convex punch member (3) fixed to a toolholder table (2) of the machine, characterized in that it comprises a die member (15) and, means (16, 17) for pressing it against said punch member (3) once said profile (6) has been bent against said punch member (3) , an elastic material mandrel (20) adapted to be placed inside said profile (6) and means for compressing-expanding said mandrel so that it presses said profile against internal surfaces of said punch member and of said die member when closed one against the other.
- Equipment according to claim 1, characterized in that said elastic material mandrel (20) is in two separate parts (20A, 20b)in contact end-to-end when introduced into said profile, each part of said mandrel comprising a passage (21) open at one end only and blind at the opposite end, the end at which said passage (21) is open being connected to a metal insert (22) adapted to be clamped by said jaws and to enable application of hydraulic pressure and being provided with means (23) for connection to hydraulic pressurizing means (24, 25) , said metal insert (22) entering the corresponding end of said profile.
- Equipment according to claim 1 characterized in that said means for compressing-expanding said mandrel (20) comprise a compression piston (28) machined to the interior profile of said profile, said piston being subjected to a thrust F by any means.
- Equipment according to one of claims 1 to 3, characterized in that said die member (15) and optionally also said punch member (3) comprise a recess (26).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9610620 | 1996-08-30 | ||
FR9610620A FR2752756B1 (en) | 1996-08-30 | 1996-08-30 | EQUIPMENT FOR FORMING METAL PROFILES |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0826440A1 EP0826440A1 (en) | 1998-03-04 |
EP0826440B1 true EP0826440B1 (en) | 2003-07-02 |
Family
ID=9495318
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97401964A Expired - Lifetime EP0826440B1 (en) | 1996-08-30 | 1997-08-21 | Apparatus for forming metal sections |
Country Status (8)
Country | Link |
---|---|
US (1) | US5771730A (en) |
EP (1) | EP0826440B1 (en) |
JP (1) | JPH1085844A (en) |
KR (1) | KR19980019153A (en) |
CA (1) | CA2213687A1 (en) |
DE (1) | DE69723172T2 (en) |
ES (1) | ES2202563T3 (en) |
FR (1) | FR2752756B1 (en) |
Families Citing this family (23)
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JPH10263712A (en) * | 1997-01-31 | 1998-10-06 | Aluminum Co Of America <Alcoa> | Stretch forming method for metal body by polymer inside mandrel |
GB2350312A (en) * | 1999-05-08 | 2000-11-29 | Rover Group | Die forming |
DE10329719A1 (en) * | 2003-07-02 | 2005-01-20 | Daimlerchrysler Ag | Elbows |
US7069761B2 (en) * | 2004-05-05 | 2006-07-04 | The Boeing Company | Gripping apparatus and method |
DE102005013689B3 (en) * | 2005-03-21 | 2006-01-05 | Forschungsgesellschaft Umformtechnik Mbh | Separating or piercing device for workpiece deformed by internal pressure has elastic membrane subject to pressure for separating or piercing |
US7340933B2 (en) * | 2006-02-16 | 2008-03-11 | Rohr, Inc. | Stretch forming method for a sheet metal skin segment having compound curvatures |
WO2009078158A1 (en) * | 2007-12-18 | 2009-06-25 | K & I Inc. | Pipe shaping method |
DE102011101231A1 (en) * | 2010-06-15 | 2011-12-15 | Kiefel Gmbh | Method and apparatus for stretching and forming a film blank and product made therewith |
KR101298018B1 (en) * | 2012-12-06 | 2013-08-26 | 김환조 | Forming machine provided with servo motor and reducer |
KR101465997B1 (en) * | 2012-12-13 | 2014-11-27 | 주식회사 성우하이텍 | Clamping device for bending press |
TWI528725B (en) | 2013-05-06 | 2016-04-01 | 國立中山大學 | Wideband frequency synthesizer and frequency synthesizing method thereof |
CN104307948A (en) * | 2014-09-26 | 2015-01-28 | 北京北方车辆集团有限公司 | Rectangular hollow steel profile stretch bending forming method and special clamping device thereof |
CN104525646A (en) * | 2014-11-26 | 2015-04-22 | 安徽科瑞科技发展有限公司 | Stretching-bending device and stretching-bending machine |
CN105598227B (en) * | 2016-03-29 | 2018-06-12 | 王志中 | A kind of integral type stretch benders |
KR101972063B1 (en) * | 2017-09-29 | 2019-04-24 | 동의대학교 산학협력단 | Bending machines and bending process |
DE102017218420A1 (en) * | 2017-10-16 | 2019-04-18 | Bayerische Motoren Werke Aktiengesellschaft | Method for producing a component |
US11318520B2 (en) * | 2018-12-30 | 2022-05-03 | John Ralph Stewart, III | Stretch forming method for a sheet metal skin with convex and concave curvatures |
CN110385358B (en) * | 2019-07-25 | 2024-05-14 | 凌云工业股份有限公司汽车零部件研发分公司 | Forming die of S-shaped aluminum alloy section bar bumper for automobile |
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CN114247787A (en) * | 2021-12-17 | 2022-03-29 | 中航贵州飞机有限责任公司 | Machining method for maintaining molded surface for numerical control stretch bending of channel-shaped part |
CN114850304B (en) * | 2022-04-28 | 2022-12-16 | 北京航空航天大学 | Combined forming method of aviation variable cross-section curvature component |
DE102022114972B4 (en) * | 2022-06-14 | 2024-07-25 | Uniflex - Hydraulik GmbH | Process for multi-axis forming of a hollow workpiece |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2739634A (en) * | 1950-09-02 | 1956-03-27 | Richard Seifried | Stretch-forming machine |
US3396565A (en) * | 1965-09-30 | 1968-08-13 | L C Miller Co | Apparatus for bending metal tubing |
US4704886A (en) * | 1985-04-22 | 1987-11-10 | Aluminum Company Of America | Stretch-forming process |
US4815308A (en) * | 1987-01-20 | 1989-03-28 | The Cyril Bath Company | Method and apparatus for forming an elongate member into a predetermined shape |
US4803878A (en) * | 1987-01-20 | 1989-02-14 | The Cyril Bath Company | Method and apparatus for forming elongate tubular members into a predetermined shape while extrusion is gas pressurized and product |
US4827753A (en) * | 1987-01-20 | 1989-05-09 | The Cyril Bath Company | Extrusion former with three-way powered movement |
US5890387A (en) * | 1989-08-24 | 1999-04-06 | Aquaform Inc. | Apparatus and method for forming and hydropiercing a tubular frame member |
CA2023675C (en) * | 1989-08-24 | 2001-07-31 | Ralph E. Roper | Apparatus and method for forming a tubular frame member |
JPH0647453A (en) * | 1992-06-19 | 1994-02-22 | Ishikawajima Harima Heavy Ind Co Ltd | Device for bending tube material |
US5396786A (en) * | 1993-03-15 | 1995-03-14 | Mueller Industries, Inc. | Machine and method for manufacturing crossover fittings |
DE9412978U1 (en) * | 1994-07-23 | 1994-10-27 | Huber & Bauer GmbH, 66763 Dillingen | Device for bending pipes |
-
1996
- 1996-08-30 FR FR9610620A patent/FR2752756B1/en not_active Expired - Fee Related
-
1997
- 1997-08-21 DE DE69723172T patent/DE69723172T2/en not_active Expired - Fee Related
- 1997-08-21 EP EP97401964A patent/EP0826440B1/en not_active Expired - Lifetime
- 1997-08-21 ES ES97401964T patent/ES2202563T3/en not_active Expired - Lifetime
- 1997-08-29 US US08/921,037 patent/US5771730A/en not_active Expired - Lifetime
- 1997-08-29 JP JP9234832A patent/JPH1085844A/en active Pending
- 1997-08-29 CA CA002213687A patent/CA2213687A1/en not_active Abandoned
- 1997-08-29 KR KR1019970042555A patent/KR19980019153A/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
EP0826440A1 (en) | 1998-03-04 |
CA2213687A1 (en) | 1998-02-28 |
JPH1085844A (en) | 1998-04-07 |
FR2752756B1 (en) | 1998-10-09 |
FR2752756A1 (en) | 1998-03-06 |
KR19980019153A (en) | 1998-06-05 |
ES2202563T3 (en) | 2004-04-01 |
US5771730A (en) | 1998-06-30 |
DE69723172T2 (en) | 2004-04-15 |
DE69723172D1 (en) | 2003-08-07 |
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