FR2493735A1 - Cold forming press for corrugated metal tube for heat exchanger - has two indented rollers with circular mandrel reducing work ovality - Google Patents
Cold forming press for corrugated metal tube for heat exchanger - has two indented rollers with circular mandrel reducing work ovality Download PDFInfo
- Publication number
- FR2493735A1 FR2493735A1 FR8023852A FR8023852A FR2493735A1 FR 2493735 A1 FR2493735 A1 FR 2493735A1 FR 8023852 A FR8023852 A FR 8023852A FR 8023852 A FR8023852 A FR 8023852A FR 2493735 A1 FR2493735 A1 FR 2493735A1
- Authority
- FR
- France
- Prior art keywords
- tube
- rollers
- cold forming
- ovality
- work
- 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.)
- Granted
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
- B21D15/00—Corrugating tubes
- B21D15/04—Corrugating tubes transversely, e.g. helically
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Abstract
Description
La présente invention concerne le façonnage de tubes minces à simple ou double paroi, en métaux ferreux et non ferreux destinés à la fabrication d'échangeurs de chaleur et autres systèmes de transfert de fluides avec brassage hélicoïdal ou turbulent. The present invention relates to the shaping of thin single or double wall tubes, made of ferrous and non-ferrous metals intended for the manufacture of heat exchangers and other fluid transfer systems with helical or turbulent stirring.
En règle générale, ce façonnage en hélice doit être réalisé à l'aide d'outillages spéciaux et onéreux. As a rule, this helical shaping must be carried out using special and expensive tools.
L'invention a pour but d'indiquer un procédé de. façonnage qui est réalisable dans des conditions économiques et qui garantit en outre l'exactitude des profils recherchés. The invention aims to indicate a method of. shaping which can be carried out under economic conditions and which also guarantees the accuracy of the profiles sought.
Selon l'invention, ce but est atteint par le fait que l'on utilise des machines standard dites de formage à froid à molettes, en adjoignant à ces machines un outillage simple, et en conférant aux molettes quelques détails de formes partIculiers. According to the invention, this object is achieved by the fact that standard machines known as cold roll forming machines are used, by adding to these machines a simple tool, and by giving the wheels some details of particular shapes.
Sans les dispositions de la présente invention, le façonnage en hélice ou en spires parallèles de tubes minces à simple ou double paroi s'avère impossible à réaliser sur ce type de machines.Without the provisions of the present invention, the shaping in a helix or in parallel turns of thin single or double wall tubes proves to be impossible to achieve on this type of machine.
La présente invention permet en outre d'effectuer une dfor- mation géométrique en hélice en limitant le laminage du métal et l'altération de ses qualités physiques primitives. The present invention also makes it possible to effect a geometric helical deformation by limiting the rolling of the metal and the alteration of its primitive physical qualities.
La description qui va suivre, en regard des dessins annexés à titre d'exemple et non limitatifs, fera mietcomprendre con-. The description which follows, with reference to the drawings annexed by way of example and without limitation, will make me understand.
ment l'invention peut être mise en pratique.The invention can be put into practice.
La figure (1) est une vue de dessus en coupe partielle de l'outillage tel qu'il est monté sur une machine de formage à froid par molettes. Figure (1) is a top view in partial section of the tool as it is mounted on a cold roll forming machine.
Les deux molettes de formage motorisées (i) et (2) traditionnellement montées sur deux axes parallèles (x, y) dans un plan vertical, comprennent
- une zone conique de déformation progressive (3)
- une zone cylindrique de calibrage (4)
- une zone conique de dégagement (5)
- un profil usiné (6) correspondant exactement au profil
souhaité sur le tube à façonner (7). L'inclinaison en
degrés de l'hélice réalisées sur chaque molette est peu
différente de l'angle d'hélice alpha < ) souhaité sur le
tube à façonner (7)
Rappel
Les descriptions ci-dessus illustrent la méthode employée pour le formage à froid des cylindres pleins ou à parois épaisses.The two motorized forming wheels (i) and (2) traditionally mounted on two parallel axes (x, y) in a vertical plane, comprise
- a conical zone of progressive deformation (3)
- a cylindrical calibration zone (4)
- a conical clearance zone (5)
- a machined profile (6) corresponding exactly to the profile
desired on the tube to be shaped (7). The tilt in
degrees of the helix performed on each wheel is little
different from the helix angle alpha <) desired on the
shaping tube (7)
Reminder
The above descriptions illustrate the method used for cold forming of full or thick-walled cylinders.
L'originalité de cette invention est décrite ci-dessous
- Le guidage du tube à façonner est assuré efficacement à l'entrée (8) et à la sortie (9) par un "canon" monobloc très rigide (coupes AA et BB fig.2). Ce "canon", situé entre les deux molettes dans un plan horizontal, est évidé dans sa partie centrale (10) (coupe CC fig.3) ceci de maniêre a permettre la plongée des molettes dans le tube 7 a éforner. The originality of this invention is described below
- The guidance of the tube to be shaped is effectively ensured at the inlet (8) and at the outlet (9) by a very rigid monobloc "barrel" (sections AA and BB fig.2). This "barrel", located between the two rollers in a horizontal plane, is hollowed out in its central part (10) (section CC fig.3) this so as to allow the rollers to plunge into the tube 7 to be deformed.
Les deux parties du "canon" de guIdage (11) et (12) subsistant dans la zone centrale de travail assurent un maintien énergique du tube (7) façonné, limitant au maximum l'ovalisation de ce dernier sous l'action de outre ornes concentri- que5 qui sliquilibrent : Fig 3
- F1 et F2 = actions des molettes
- F3 et FZ = actions du "canon" de guidage.The two parts of the guIdage "barrel" (11) and (12) remaining in the central working area ensure energetic maintenance of the shaped tube (7), limiting as much as possible the ovalization of the latter under the action of further ornaments concentric5 which are balanced: Fig 3
- F1 and F2 = wheel actions
- F3 and FZ = actions of the guide "gun".
Le canon comporte à sa partie inférieure un support rigide (13) le rendant solidaire du bêti (14) de la machine (Fig 2 et 3). The barrel has at its lower part a rigid support (13) making it integral with the frame (14) of the machine (Fig 2 and 3).
L'entrainement en rotation du tube (7} est amélioré, par rapport aux procédés classiques, par deux détails de formes décrits dans la figure n0 4 qui représente un agrandissement détaillé du profil (6) de la molette
Toute la surface de travail (15) de chaque molette sera traitée par le procédé dit de grenaillage afin d'obtenir des micros cavités et conférant à la molette un aspect rugueux. De plus, les parties saillantes de la zone de travail de chaque molette sont striées par opération de moletage (16).The rotational drive of the tube (7} is improved, compared to conventional methods, by two details of shapes described in Figure No. 4 which represents a detailed enlargement of the profile (6) of the wheel
The entire working surface (15) of each wheel will be treated by the process known as shot peening in order to obtain micro cavities and giving the wheel a rough appearance. In addition, the projecting parts of the working area of each wheel are striated by knurling operation (16).
Ces deux détails de formes réalisés sur les zones de travail des molettes assurent
- Un entrainement en rotation parfait du tube (7) à façonner, évitant le glissement qui provoque un chevauchement des hélices façonnées et un "bourrage" du tube (7), bloquant ce dernier en rotation.These two details of shapes made on the working areas of the wheels ensure
- A perfect rotation drive of the tube (7) to be shaped, avoiding slippage which causes an overlap of the shaped propellers and a "stuffing" of the tube (7), blocking the latter in rotation.
La présente invention permet par conséquent de façonner en une seule passe des empreintes hélicoidales ou parallèles sur des tubes à simple ou double paroi sans limitation de longueur
En outre, les détails de forme (15) et (16) Fig. 4 pratiqués sur les molettes (1) et (2) Fig.1 se reproduisent en faible profondeur sur la surface externe des tubes façonnés. Les stries et les micros cavités ainsi reproduites durant la déformation du tube (7) confèrent à ce dernier un état de surface propre à améliorer les échanges thermiques (échangeurs de chaleur), ainsi la surface d'échange obtenue avec ce système est plus importante que. celle d'un tube lisse de mêmes caractéristiques dimentionnelles.The present invention therefore makes it possible to shape helical or parallel impressions in a single pass on single or double wall tubes without length limitation.
In addition, the shape details (15) and (16) Fig. 4 made on the knobs (1) and (2) Fig.1 reproduce in shallow depth on the external surface of the shaped tubes. The streaks and the micro cavities thus reproduced during the deformation of the tube (7) give the latter a surface condition suitable for improving heat exchanges (heat exchangers), thus the exchange surface obtained with this system is greater than . that of a smooth tube with the same dimensional characteristics.
De plus, ces rugosités provoquent des mini turbulences au niveau de l'écoulement du fluide en contact avec cette surface amenant ainsi un coefficient d'échange thermique supérieur. In addition, these roughnesses cause mini turbulence at the level of the flow of the fluid in contact with this surface thus bringing a higher coefficient of heat exchange.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8023852A FR2493735A1 (en) | 1980-11-07 | 1980-11-07 | Cold forming press for corrugated metal tube for heat exchanger - has two indented rollers with circular mandrel reducing work ovality |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8023852A FR2493735A1 (en) | 1980-11-07 | 1980-11-07 | Cold forming press for corrugated metal tube for heat exchanger - has two indented rollers with circular mandrel reducing work ovality |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2493735A1 true FR2493735A1 (en) | 1982-05-14 |
FR2493735B1 FR2493735B1 (en) | 1984-02-17 |
Family
ID=9247800
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8023852A Granted FR2493735A1 (en) | 1980-11-07 | 1980-11-07 | Cold forming press for corrugated metal tube for heat exchanger - has two indented rollers with circular mandrel reducing work ovality |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2493735A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0222100A2 (en) * | 1985-10-31 | 1987-05-20 | Wieland-Werke Ag | Finned tube with a notched groove bottom and method for making it |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3387477A (en) * | 1965-11-29 | 1968-06-11 | Price Pfister Brass Mfg | Apparatus and method for roll forming flexible tubing |
-
1980
- 1980-11-07 FR FR8023852A patent/FR2493735A1/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3387477A (en) * | 1965-11-29 | 1968-06-11 | Price Pfister Brass Mfg | Apparatus and method for roll forming flexible tubing |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0222100A2 (en) * | 1985-10-31 | 1987-05-20 | Wieland-Werke Ag | Finned tube with a notched groove bottom and method for making it |
EP0222100A3 (en) * | 1985-10-31 | 1987-10-07 | Wieland-Werke Ag | Finned tube with a notched groove bottom and method for making it |
US4796693A (en) * | 1985-10-31 | 1989-01-10 | Wieland-Werke Ag | Finned tube with indented groove base and method of forming same |
Also Published As
Publication number | Publication date |
---|---|
FR2493735B1 (en) | 1984-02-17 |
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ST | Notification of lapse |