EP1035930B1 - Dispositif de chauffage d'un outil de mise en forme - Google Patents
Dispositif de chauffage d'un outil de mise en forme Download PDFInfo
- Publication number
- EP1035930B1 EP1035930B1 EP98954516A EP98954516A EP1035930B1 EP 1035930 B1 EP1035930 B1 EP 1035930B1 EP 98954516 A EP98954516 A EP 98954516A EP 98954516 A EP98954516 A EP 98954516A EP 1035930 B1 EP1035930 B1 EP 1035930B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- forming tool
- bending
- polar
- 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.)
- 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
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
- B21D7/022—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment over a stationary forming member only
-
- 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
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
Definitions
- the present invention relates to a tool for shaping tubes which are made of polar or dielectric plastic material, with a bending the tubes fitted with the shaping tool and a process for bending the tubes, according to the preambles of claims 1, 7 and 13 respectively.
- the technique currently used consists in shaping a tube of material plastic on a template machined to the shape we want to give to the tube and this on its entire length.
- the template plus tube assembly is heated and then cooled.
- the tube and the template are heated by means of conduction system (water hot, steam, hot air) or radiation (infrared).
- the geometry of the part or of the tube depends on the geometry of the template, which implies making a template per piece according to the shape it must get.
- the object of the shaping tool according to the present invention as defined in claim 1 is to place a plastic dielectric tube in an electric frequency field and of high tension so as to agitate the molecules of the material, in order to cause a heating inside the tube.
- the tube shaping tool according to the invention comprises means for heating by dielectric loss using frequencies which are adapted to the materials polar constituting the tube, in order to conform it.
- the shaping tool according to a preferred embodiment of the present invention is isolated from the outside through a shielding cage retaining external radiation electromagnetic waves from the heating means.
- the shaping tool is preferably made from an insulating material.
- the shaping tool includes heating means which can be constituted of two electrodes each formed by a metal plate arranged in two parallel planes on either side of the shaping tool, said first plate being connected to an alternating voltage source, while the other is connected to ground.
- the bending machine comprises an elongated frame integral with a carriage provided with a mandrel for holding a bending tube of material polar or dielectric plastic so as to be able to move said tube in rotation about its axis and in a direction longitudinal to a bending head located at one end of said frame, characterized in that said head bending tool includes at least one shaping tool and means of heating by dielectric loss using frequencies which are adapted to the polar materials constituting said tube in order to conform it.
- the bending machine has a bending head which comprises means for cooling the tube which are arranged according to the same longitudinal axis as that carrying said tube.
- the bending machine comprises a bending head which can be isolated from the machine frame via a shielding cage retaining external radiation from electromagnetic waves from heating means.
- the bending machine according to the invention comprises a tool for shaping the tubes which is preferably made of an insulating material.
- the bending machine according to the invention has heating means which preferably consist of two electrodes in the form of metal plates arranged in two parallel planes and on both sides the shaping tool, said first plate being connected to an alternating voltage source while said second is connected to ground.
- FIGS. 1 to 3 show a machine for bending 1 of the tubes 2 produced in plastic and more particularly in dielectric materials or polar.
- the bending machine 1 comprises a fixed frame 3 which is elongated and which carries one of its ends a bending head 4.
- the latter comprises a first 5 guide devices 5 for ensuring the horizontal movements of said bending head 4 relative to the main axes of the fixed frame 3.
- the fixed frame 3 is integral on one of its sides and parallel to its axis longitudinal of a guide rail 6 on which slides a carriage 7 which is moves towards and away from the bending head 4.
- the guide rail 6 is offset laterally and in height relative to the axis longitudinal of the frame 3 to present the carriage 7 along a longitudinal axis parallel to that of the bending head 4.
- the carriage 7 comprises a mandrel 8 for receiving the tube 2 to be bent which is brought via a loading station 9 provided with swivel arm 10 and 11. The latter come to take the tubes 2 to be bent in a store 12 located next to the loading station 9.
- the bending head 4 of the machine 1 is placed in a cage shield 32 so as to isolate it from the outside during the shaping of the tube 2.
- the cage 32 consists of walls 13 joined together by a ceiling 14 and a floor 15, while doors 16 allow access to the interior of said cage in order to be able to intervene on the bending head 4.
- the cage 32 is made of an insulating material to avoid any risk of danger during the shaping of the tube 2.
- the bending machine 1 is controlled by different units 17, 18, 19 of programming and control to obtain the bending of tube 2 in material dielectric plastic.
- FIG. 4 there is shown the bending head 4 which includes a horizontal arm 20 secured at one of its ends to a plate 21 which cooperates with the guide device 5 ensuring the horizontal movements of said head by relation to the main axes of the building 3.
- the arm 20 comprises, opposite the plate 21, an assembly 22 extending vertically above said arm and carrying a roller 23, a tool for form 24 and heating means 25.
- the winding roller 23 is mounted to rotate freely around a vertical axis 26 which is integral with an articulated arm 27.
- the arm 27 is controlled to pivot in rotation about the vertical axis of the assembly 22 and of the shaping tool 24.
- the shaping tool 24 is fixed on the assembly 22 at the same level as the roller 23 and the horizontal axis carrying the carriage 7 secured to the mandrel 8 fitted with tube 2.
- cooling means 28 consist, for example, of a nozzle 29 connected to a source of cold air pressure.
- the nozzle 29 comes to cooperate with the end of the tube 2 which is opposite to that to be bent in the forming tool 24.
- the mandrel 28 also allows to rotate the tube 2 around its longitudinal axis.
- the shaping tool 24 is adapted to the diameter of the tube 2, of the polar material constituting said tube and the bending radius to which it must conform.
- the shaping tool 24 is made of an insulating plastic material and insensitive to electric fields such as material marketed under the brand TÉFLON®.
- the tool could be produced in ceramic without changing its characteristics.
- the heating means 25 of the tube 2 to be bent consist of two electrodes 30 and 31 each formed from a metal plate with a circular profile.
- the first electrode or plate 30 is disposed above and against the tool. shaping 24, while the second electrode or plate 31 is located just in below and against said tool.
- the electrode 30 is connected to the unit 19 which delivers an alternating voltage source, while the other electrode 31 is connected to a ground not shown.
- FIGS. 5 to 8 the different stages of bending the tube 2 are shown. radius of curvature of the forming tool 24.
- the tube 2 is brought by the carriage 7 so that the mandrel 8 secured to the cooling nozzle 29 cooperates with the end of the tube opposite to that which is going to be formed.
- the tube 2 is positioned close to the shaping tool 24, while the roller 23 is moved laterally to block said tube so that it cooperates with the internal profile of each. Indeed the roller 23 and the tool 24 has an internal profile which depends on the external diameter of the tube 2 ( Figures 6 and 7).
- the arm 27 carrying the roller 23 pivots in rotation about the vertical axis of the assembly 22 which merges with that of the shaping tool 24 in order to cold deform the tube 2 to the bending radius (figure 8).
- an alternating voltage is applied by means of unit 19 to electrode 30, while the other electrode 31 is connected to ground.
- This voltage generates an electric field of frequency and high voltage so as to agitate the molecules of the dielectric material constituting the tube 2, so that the latter heats up.
- the heating means 25 emit when the temperature of the tube 2 of external radiation from electromagnetic waves. These radiations are recovered by the shielding cage 32 to avoid any risk of temperature rise for individuals in the vicinity of the machine 1.
- heating means 25 make it possible to raise the temperature of the tube 2 in seconds.
- the cooling means 28 blows cold air under pressure via the nozzle 29 inside the tube 2 in order to cool it so that it retains its bending shape to the radius of the tool 24.
- the arm 27 returns to its original position and the roller 23 moves laterally in order to release the tube 2.
- the tube 2 can be moved along its axis longitudinal and rotate around it to perform another bending said tube in a different plane.
- the length, rotation and bending movements of the tube 2 are carried out by numerically controlled axes managed by control units 17 and 18.
- the shaping tool could include several radii of bending, while the bending head would be provided with guide means vertical in order to present the correct shaping tool according to the radius of bending to be obtained.
- the shaping tool 24 can be used on any other machine different from tube bending machines. Also, the implementation tool form can be used independently of the example described above. In indeed, the bending machine 1 is an example of using the shaping tool 24 which is not limiting.
- Unit 19 includes a high frequency assembly which consists of a transmitter capable of emitting a power whose level is adjustable, and of a capacitive type processing structure in which is placed the material to be treated.
- the generator is of the amplifier type driven by quartz.
- the energy from the generator is transmitted to the treatment structure via a impedance adapter by coaxial cable of known impedance.
- the adapter impedance is equipped with two variable and motorized elements to transmit all the energy from the generator to the load. This function is ensured automatically thanks to a double sensor whose output signals are amplified and processed by electronics that control each of the two motors coupled with variable elements.
- the automatic tuning system allows optimize and manage the energy level transmitted to the entire treatment product and thus ensure good reproducibility of the treatment.
- the application structure of the field (capacity per example) is optimized to transmit energy adequately and homogeneous in the areas to be treated.
- the shape of the electrodes is therefore optimized depending on the diameter and thickness of the tube and the bending radius.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Machines For Laying And Maintaining Railways (AREA)
- General Induction Heating (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Description
- à disposer un tube contre un outil de mise en forme au moyen d'un galet enrouleur,
- à déformer à froid le tube par l'intermédiaire du galet enrouleur,
- à chauffer le tube par des moyens d'échauffement par perte diélectrique utilisant des fréquences qui sont adaptées aux matériaux polaires constituant le tube,
- à refroidir le tube par une injection d'air sous pression.
Claims (13)
- Outil de mise en forme d'un tube en matière plastique polaire ou diélectrique qui comporte des moyens d'échauffement (25), caractérisé en ce que lesdits moyens d'échauffement sont des moyens d'échauffement par perte diélectrique utilisant des fréquences qui sont adaptées aux matériaux polaires constituant le tube (2) afin de les conformer.
- Outil de mise en forme suivant la revendication 1, caractérisé en ce qu'il comprend des moyens de refroidissement (28) du tube (2) en matériaux polaires qui sont disposés sur le même axe longitudinal que celui portant ledit tube (2).
- Outil de mise en forme suivant la revendication 1, caractérisé en ce qu'il est isolé de l'extérieur par l'intermédiaire d'une cage (32) de blindage retenant les rayonnements extérieurs des ondes électromagnétiques provenant des moyens d'échauffements (25).
- Outil de mise en forme suivant la revendication 1, caractérisé en ce qu'il est réalisé dans une matière isolante.
- Outil de mise en forme suivant la revendication 1, caractérisé en ce qu'un galet d'enroulement (23) pivote autour de l'outil de mise en forme (24) afin de conformer à froid le tube (2) en matériau polaire au rayon dudit outil.
- Outil de mise en forme suivant la revendication 1, caractérisé en ce que les moyens d'échauffement (25) sont constitués de deux électrodes formée chacune d'une plaque métallique (30, 31) disposée dans deux plans parallèles et de part et d'autre de l'outil de mise en forme (24), ladite première plaque (30) étant reliée à une source de tension alternative (19), tandis que l'autre (31) est raccordée à la masse.
- Machine à cintrer du genre comportant un bâti allongé (3) solidaire d'un chariot (7) muni d'un mandrin (8) de maintien d'un tube (2) à cintrer en matériau plastique polaire ou diélectrique de manière à pouvoir déplacer ledit tube en rotation autour de son axe et dans une direction longitudinale vers une tête de cintrage (4) située à une extrémité dudit bâti, caractérisée en ce que la tête de cintrage (4) comporte au moins un outil de mise en forme (24) et des moyens d'échauffement (25) par perte diélectrique utilisant des fréquences qui sont adaptées aux matériaux polaires constituant le tube (2) afin de les conformer.
- Machine à cintrer suivant la revendication 7, caractérisée en ce que la tête de cintrage (4) comprend des moyens de refroidissement (28) du tube (2) en matériaux polaires qui sont disposés sur le même axe longitudinal que celui portant ledit tube (2).
- Machine à cintrer suivant la revendication 7, caractérisée en ce que la tête de cintrage (4) est isolée du bâti (3) de la machine (1) par l'intermédiaire d'une cage (32) de blindage retenant les rayonnements extérieurs des ondes électromagnétiques provenant des moyens d'échauffements (25).
- Machine à cintrer suivant la revendication 7, caractérisée en ce que l'outil de mise en forme (4) du tube (2) en matériaux polaires est réalisé en une matière isolante.
- Machine à cintrer suivant la revendication 7, caractérisée en ce que la tête de cintrage (4) comprend un galet d'enroulement (23) qui pivote autour de l'outil de mise en forme (24) afin de conformer à froid le tube (2) en matériau polaire au profit dudit outil.
- Machine à cintrer suivant la revendication 7, caractérisée en ce que les moyens d'échauffement (25) sont constitués de deux électrodes formée chacune d'une plaque métallique (30, 31) disposée dans deux plans parallèles et de part et d'autre de l'outil de mise en forme (24), la première plaque (30) étant reliée à une source de tension alternative (19), tandis que l'autre (31) est raccordée à la masse.
- Procédé de cintrage d'un tube (2) en matière plastique polaire ou diélectrique, caractérisé en ce qu'il consiste :à disposer un tube (2) contre un outil de mise en forme (24) au moyen d'un galet enrouleur (23),à déformer à froid le tube (2) par l'intermédiaire du galet enrouleur (23),à chauffer le tube (2) par des moyens d'échauffement (25) par perte diélectrique utilisant des fréquences qui sont adaptées aux matériaux polaires constituant le tube (2),à refroidir le tube (2) par une injection d'air sous pression.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9714259 | 1997-11-07 | ||
FR9714259A FR2770794B1 (fr) | 1997-11-07 | 1997-11-07 | Dispositif de chauffage d'un outil de mise en forme |
PCT/FR1998/002360 WO1999024189A1 (fr) | 1997-11-07 | 1998-11-05 | Dispositif de chauffage d'un outil de mise en forme |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1035930A1 EP1035930A1 (fr) | 2000-09-20 |
EP1035930B1 true EP1035930B1 (fr) | 2002-02-13 |
Family
ID=9513348
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98954516A Expired - Lifetime EP1035930B1 (fr) | 1997-11-07 | 1998-11-05 | Dispositif de chauffage d'un outil de mise en forme |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1035930B1 (fr) |
AT (1) | ATE213183T1 (fr) |
CA (1) | CA2309306A1 (fr) |
DE (1) | DE69803879T2 (fr) |
FR (1) | FR2770794B1 (fr) |
WO (1) | WO1999024189A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004003682A1 (de) * | 2004-01-24 | 2005-08-11 | Klingelnberg Ag | Verfahren zum Warmfließformbiegen und eine Vorrichtung zur Ausübung des Verfahrens |
FR2929140B1 (fr) * | 2008-03-26 | 2010-07-30 | Faurecia Sys Echappement | Machine de cintrage pour tubes |
SG10201907808VA (en) | 2018-09-05 | 2020-04-29 | Blm Spa | Machine for the working of tubes provided with a device for detecting any slippage of the tube being worked |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1450807A (fr) * | 1965-07-15 | 1966-06-24 | Perfectionnements aux procédés et dispositifs pour déformer des tronçons de tubes métalliques et aux tubes déformés obtenus | |
DE2220910A1 (de) * | 1972-04-28 | 1973-12-20 | Babcock & Wilcox Ag | Verfahren und vorrichtung zur herstellung von boegen aus rohren oder hohlkoerpern im warmbiegeverfahren |
JPS5645220A (en) * | 1979-09-21 | 1981-04-24 | Dai Ichi High Frequency Co Ltd | Bending method for metallic pipe |
-
1997
- 1997-11-07 FR FR9714259A patent/FR2770794B1/fr not_active Expired - Fee Related
-
1998
- 1998-11-05 EP EP98954516A patent/EP1035930B1/fr not_active Expired - Lifetime
- 1998-11-05 AT AT98954516T patent/ATE213183T1/de not_active IP Right Cessation
- 1998-11-05 DE DE69803879T patent/DE69803879T2/de not_active Expired - Fee Related
- 1998-11-05 CA CA002309306A patent/CA2309306A1/fr not_active Abandoned
- 1998-11-05 WO PCT/FR1998/002360 patent/WO1999024189A1/fr active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
FR2770794A1 (fr) | 1999-05-14 |
ATE213183T1 (de) | 2002-02-15 |
CA2309306A1 (fr) | 1999-05-20 |
WO1999024189A1 (fr) | 1999-05-20 |
FR2770794B1 (fr) | 2000-01-21 |
DE69803879D1 (de) | 2002-03-21 |
EP1035930A1 (fr) | 2000-09-20 |
DE69803879T2 (de) | 2002-10-10 |
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