EP1338352A1 - Tool for forming undulated heat exhange surfaces for heat exchangers by cold folding a sheet and method for making the forming profiles of such a tool - Google Patents

Tool for forming undulated heat exhange surfaces for heat exchangers by cold folding a sheet and method for making the forming profiles of such a tool Download PDF

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Publication number
EP1338352A1
EP1338352A1 EP03290417A EP03290417A EP1338352A1 EP 1338352 A1 EP1338352 A1 EP 1338352A1 EP 03290417 A EP03290417 A EP 03290417A EP 03290417 A EP03290417 A EP 03290417A EP 1338352 A1 EP1338352 A1 EP 1338352A1
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EP
European Patent Office
Prior art keywords
forming
tool
profiles
strip
curve
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Application number
EP03290417A
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German (de)
French (fr)
Inventor
Daniel Taillepied
Catherine Fourmont
André Rolland
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D'ETUDES ET DE CONSTRUCTIONS AERO-NAVALES Ste
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D'ETUDES ET DE CONSTRUCTIONS AERO-NAVALES Ste
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Publication of EP1338352A1 publication Critical patent/EP1338352A1/en
Withdrawn legal-status Critical Current

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    • 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
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/02—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by pressing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements

Definitions

  • the invention relates to a forming tool of heat exchanger elements with exchange surfaces corrugated thermal, especially spacers, from of a strip of a deformable material, such as metal, between two surfaces each with a profile of corrugated forming accordingly, of the type comprising at at least two blades whose facing faces have said corrugated profiles and which are separated from one of the other to define between them a space for receiving the strip to be deformed, and a method for producing profiled surfaces of the blades of this forming tool corrugated heat exchange surfaces.
  • the object of the present invention is to provide a forming tools of the type indicated above, and a process for producing the profiles of the forming blades, which overcome the aforementioned drawbacks.
  • the tool according to the invention is characterized in that the profiles are configured from way that their deviation in the direction of the thickness of the interlayer is constant along the undulations in the space between the profiles.
  • the process for producing profiles according to the invention is characterized in that it consists of define the curve which passes through the center of the strip formed between the two profiles and to be established as profiles forming those that we get by adding part and of the curve for each point of it, in the direction normal to this curve, a distance constant.
  • the constant distance is equal to the sum of the thickness of the interlayer and the sets necessary for forming, divided by two.
  • FIG. 4 shows a machine 1 for forming a corrugated strip hereinafter called part 2 obtained by cold bending of a strip 4 indicated diagrammatically in Figures 5 to 10, but which is not visible on the figure 4.
  • the forming is obtained using a tool upper forming 6 and a lower tool 7.
  • the tool upper 6 and lower tool 7 are each made up two forming blades and a spacer blade, which determines the space between the two forming blades. So the upper tool 6 comprises the two forming blades 6a, 6b and the spacer blade 6c while the tool lower 7 comprises the two forming blades 7a, 7b and, between these two blades, the spacer blade 7c.
  • the tool upper 6 is mounted on an upper tool holder 10 vertically movable, while the lower tool is mounted on a lower tool holder 11 horizontally mobile.
  • the upper 6 and lower 7 tools are associated with strippers 13 and 14 respectively which have to guide and maintain the strip 4 at during forming.
  • each fin has a cross section in the shape of a U.
  • each fin has a wavy profile.
  • the height and the pitch of the fins and the geometry of the profile of their surfaces lateral are determined by the dimensions of the blades, the shape of these and their positions one by compared to each other.
  • the strip-shaped strap is introduced at the back of the machine shown in figure 4, passes between the upper 6 and lower 7 blades, to be formed by successive alternate folding and is guided on the housing support where the raw cutting of the interlayer will take place formed (not shown).
  • the top strippers and lower 13, 14 are used to guide the sheet and the maintain on the lower blades 7a, 7b or upper 6a, 6b according to the progress in the forming cycle. These strippers are only linked to tools in their horizontal movements.
  • a forming cycle can be broken down into six successive steps, in accordance with Figures 5 to 10.
  • Figure 5 shows the first step during which the upper tool 6 forms the fin A2 which is open up, for the first time, and shape. the wing A1 which is open downwards, for the second time.
  • the strippers 13 and 14 guide and maintain the strip during forming.
  • the upper tool 6 is released by moving towards the high and the strippers keep the strip stamped on the lower tool 7.
  • the lower tool 7 moves horizontally to the right and thus position for the realization of the wing A2 for the second time and A3 fin for the first time.
  • the Figure 8 shows the fourth step in which the upper tool 6 forms the fin A3 which is open down, for the first time, and forms the fin A2 for the second time, the strippers guiding and now the sheet during forming.
  • Figure 10 illustrates that in the sixth step the lower tool 7 moves into position to perform the forming the A3 fin for the second time and the fin A4 for the first time. At the end of these six stages, the forming cycle resumes at the first stage.
  • the tools used so far have the major drawback that the space of reception is not uniform along the undulations.
  • the invention provides a method which makes it possible to carry out tools which overcome the disadvantage of the thickness irregular along the undulations.
  • FIG. 2 illustrates the method according to the invention.
  • This figure shows the conjugate profiles of a blade upper for example 6a and a lower blade 6b conferring between them the strip 4 the ripple of tab 2, determined by the profiles of the blades of forming.
  • the thickness of the interlayer is designated by the ep reference.
  • a game d / 2 whose dimensions are exaggerated in relation to the thickness of the strip and which is planned to take into account for example a film of lubricant.
  • the upper and lower tools thus determined are advantageously made of a strongly steel alloy (molybdenum cobalt, chromium, tungsten and vanadium) and treated to a very high hardness of for example 66 Hrc.
  • the mathematical definition of the profile allows a mode of manufacturing on automatic machine.
  • the invention makes it possible to carry out corrugated interlayer forming profiles of any shape desired. It suffices only to establish, advantageously mathematically, the central curve of the interlayer and define the points of the conjugate forming profiles according to the method explained above.
  • the invention thus makes it possible to form strips of constant thickness while avoiding risks of tears inherent in the manufacturing process dividers, according to the state of the art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

The forming tool for producing inserts from a deformable metal foil (2) between two undulated surfaces comprises upper (6) and lower (7) forming tools each constituted from two forming leaves (6a,6b) and a spacing leaf (6c). The lower tool comprises two forming leaves (7a,7b) between which is a spacing leaf (7c). The upper tool is mounted on a vertically movable upper tool holder (10) whilst the lower tool so mounted on a lower horizontally movable tool holder (11).

Description

L'invention concerne un outillage de formage d'éléments d'échangeurs thermiques à surfaces d'échange thermique ondulées, notamment intercalaires, à partir d'un feuillard en un matériau déformable, tel que du métal, entre deux surfaces présentant chacune un profil de formage ondulé en conséquence, du type comprenant au moins deux lames dont les faces en regard présentent lesdits profils ondulés et qui sont écartés l'un de l'autre pour définir entre eux un espace de réception du feuillard à déformer, et un procédé de réalisation des surfaces profilées des lames de cet outillage de formage de surfaces d'échange thermique ondulé.The invention relates to a forming tool of heat exchanger elements with exchange surfaces corrugated thermal, especially spacers, from of a strip of a deformable material, such as metal, between two surfaces each with a profile of corrugated forming accordingly, of the type comprising at at least two blades whose facing faces have said corrugated profiles and which are separated from one of the other to define between them a space for receiving the strip to be deformed, and a method for producing profiled surfaces of the blades of this forming tool corrugated heat exchange surfaces.

On connaít déjà des outillages de ce type, qui comportent une lame supérieure et une lame inférieure dont les surfaces de formage présentent des profils identiques et qui sont susceptibles d'être positionnées par un mouvement de translation d'une lame par rapport à l'autre.We already know tools of this type, which have an upper blade and a lower blade whose forming surfaces have profiles identical and which are likely to be positioned by a translational movement of a blade relative to the other.

Cet outillage connu présente l'inconvénient illustré à la figure 1 que l'espace de réception du feuillard déformé, c'est-à-dire de l'intercalaire n'est pas constante dans la direction de l'ondulation. En effet, du fait que les profils A et B sont identiques, l'écart dans la direction y est certes constante pour toutes les valeurs x dans un système de coordonnées x, y, mais l'épaisseur dans les zones inclinées, telles que par exemple au point E est inférieure à celle aux zones de sommet S des profils. Par conséquent ces outillages connus ne permettent pas d'obtenir un formage optimal en tout point des surfaces d'échange thermique et, de plus, occasionne des déchirures aux endroits où l'espace de réception est le plus étroit.This known tool has the illustrated drawback in Figure 1 that the space for receiving the strip distorted, that is to say the interlayer is not constant in the direction of the ripple. Indeed, from fact that profiles A and B are identical, the difference in the direction is certainly constant there for all x values in an x, y coordinate system, but thickness in inclined areas, such as by example at point E is less than that at areas of top S of the profiles. Therefore these tools known do not allow to obtain an optimal forming in any point on the heat exchange surfaces and, moreover, causes tears where the space of reception is the narrowest.

La présente invention a pour but de proposer un outillage de formage du type indiqué plus haut, et un procédé de réalisation des profils des lames de formage, qui pallient les inconvénients susmentionnés.The object of the present invention is to provide a forming tools of the type indicated above, and a process for producing the profiles of the forming blades, which overcome the aforementioned drawbacks.

Pour atteindre ce but, l'outillage selon l'invention est caractérisé en ce que les profils sont configurés de façon que leur écart dans la direction de l'épaisseur de l'intercalaire est constant le long des ondulations dans l'espace entre les profils.To achieve this goal, the tool according to the invention is characterized in that the profiles are configured from way that their deviation in the direction of the thickness of the interlayer is constant along the undulations in the space between the profiles.

Le procédé de réalisation des profils selon l'invention est caractérisé en ce qu'il consiste à définir la courbe qui passe par le centre du feuillard formée entre les deux profils et à établir comme profils de formage ceux que l'on obtient en ajoutant de part et d'autre de la courbe pour chaque point de celle-ci, dans la direction normale à cette courbe, une distance constante.The process for producing profiles according to the invention is characterized in that it consists of define the curve which passes through the center of the strip formed between the two profiles and to be established as profiles forming those that we get by adding part and of the curve for each point of it, in the direction normal to this curve, a distance constant.

Selon une caractéristique de l'invention, la distance constante est égale à la somme de l'épaisseur de l'intercalaire et des jeux nécessaires au formage, divisé par deux.According to a characteristic of the invention, the constant distance is equal to the sum of the thickness of the interlayer and the sets necessary for forming, divided by two.

L'invention sera mieux comprise, et d'autres buts, caractéristiques et avantages de celle-ci apparaítront plus clairement dans la description explicative qui va suivre faite en référence aux dessins schématiques annexés donnés uniquement à titre d'exemple illustrant un mode de réalisation de l'invention et dans lesquels :

  • la figure 1 est une représentation schématique d'un outillage selon l'état de la technique ;
  • la figure 2 illustre les profilés conjugués des deux lames coopérantes d'un outillage selon l'invention, pour illustrer la réalisation de ces profilés ;
  • la figure 3 est une vue en perspective d'une lame de formage ;
  • la figure 4 est une vue en perspective simplifiée d'une machine de formage des surfaces d'échange thermique, équipée d'un outillage selon l'invention ;
  • les figures 5 à 10 illustrent différentes étapes de formage de surfaces d'échange à l'aide de l'outillage illustré sur la figure 4.
The invention will be better understood, and other objects, characteristics and advantages thereof will appear more clearly in the explanatory description which follows, given with reference to the appended schematic drawings given solely by way of example illustrating an embodiment of the invention and in which:
  • Figure 1 is a schematic representation of a tool according to the state of the art;
  • FIG. 2 illustrates the conjugate profiles of the two cooperating blades of a tool according to the invention, to illustrate the production of these profiles;
  • Figure 3 is a perspective view of a forming blade;
  • Figure 4 is a simplified perspective view of a machine for forming heat exchange surfaces, equipped with a tool according to the invention;
  • FIGS. 5 to 10 illustrate different stages of forming exchange surfaces using the tool illustrated in FIG. 4.

Pour faciliter la compréhension de l'invention on décrira, avant d'exposer l'invention, la structure générale d'une machine équipée d'un outillage pour le formage de surfaces d'échange thermique, en se référant aux figures 3 à 10.To facilitate understanding of the invention, will describe, before exposing the invention, the structure general of a machine equipped with tools for forming heat exchange surfaces, referring in Figures 3 to 10.

La figure 4 montre une machine 1 de formage d'une bande ondulée appelée ci-après intercalaire 2 obtenue par pliage à froid d'un feuillard 4 indiqué schématiquement sur les figures 5 à 10, mais qui n'est pas visible sur la figure 4. Le formage est obtenu à l'aide d'un outil de formage supérieur 6 et d'un outil inférieur 7. L'outil supérieur 6 et l'outil inférieur 7 sont constitués chacun de deux lames de formage et d'une lame d'espacement, qui détermine l'espace entre les deux lames de formage. Ainsi l'outil supérieur 6 comporte les deux lames de formage 6a, 6b et la lame d'espacement 6c tandis que l'outil inférieur 7 comporte les deux lames de formage 7a, 7b et, entre ces deux lames, la lame d'espacement 7c. L'outil supérieur 6 est monté sur un porte-outil supérieur 10 verticalement mobile, tandis que l'outil inférieur est monté sur un porte-outil inférieur 11 horizontalement mobile. Aux outils supérieur 6 et inférieur 7 sont associés des dévétisseurs respectivement 13 et 14 qui ont pour fonction de guider et maintenir le feuillard 4 au cours du formage.FIG. 4 shows a machine 1 for forming a corrugated strip hereinafter called part 2 obtained by cold bending of a strip 4 indicated diagrammatically in Figures 5 to 10, but which is not visible on the figure 4. The forming is obtained using a tool upper forming 6 and a lower tool 7. The tool upper 6 and lower tool 7 are each made up two forming blades and a spacer blade, which determines the space between the two forming blades. So the upper tool 6 comprises the two forming blades 6a, 6b and the spacer blade 6c while the tool lower 7 comprises the two forming blades 7a, 7b and, between these two blades, the spacer blade 7c. The tool upper 6 is mounted on an upper tool holder 10 vertically movable, while the lower tool is mounted on a lower tool holder 11 horizontally mobile. The upper 6 and lower 7 tools are associated with strippers 13 and 14 respectively which have to guide and maintain the strip 4 at during forming.

Concernant le feuillard à l'état déformée ou intercalaire 2, il est pliée de façon à être constitué par une succession dans la direction de la flèche F d'ailettes A3 et A4 qui sont ouvertes de façon alternante vers le haut et vers le bas, chaque ailette présentant une section transversale en forme d'un U. Par contre dans la direction perpendiculaire à la flèche F, chaque ailette présente un profil ondulé.Regarding the strip in the deformed state or tab 2, it is folded so as to be formed by a succession in the direction of arrow F fins A3 and A4 which are alternately open up and down, each fin having a cross section in the shape of a U. On the other hand in the direction perpendicular to arrow F, each fin has a wavy profile.

On comprend aisément que la hauteur et le pas des ailettes et la géométrie du profil de leurs surfaces latérales sont déterminés par les dimensions des lames, la forme de celles-ci et leurs positions l'une par rapport à l'autre.It is easy to understand that the height and the pitch of the fins and the geometry of the profile of their surfaces lateral are determined by the dimensions of the blades, the shape of these and their positions one by compared to each other.

Pour former les ailettes et leurs surfaces ondulées, le feuillard en forme de bande est introduite à l'arrière de la machine montrée sur la figure 4, passe entre les lames supérieure 6 et inférieure 7, pour être formée par pliage alterné successif et est guidée sur le carter de support où aura lieu la découpe brute de l'intercalaire formé (non représenté). Les dévétisseurs supérieur et inférieur 13, 14 permettent de guider la feuille et de la maintenir sur les lames inférieures 7a, 7b ou supérieures 6a, 6b suivant l'avancement dans le cycle de formage. Ces dévétisseurs ne sont liés aux outils que dans leurs mouvements horizontaux.To form the fins and their wavy surfaces, the strip-shaped strap is introduced at the back of the machine shown in figure 4, passes between the upper 6 and lower 7 blades, to be formed by successive alternate folding and is guided on the housing support where the raw cutting of the interlayer will take place formed (not shown). The top strippers and lower 13, 14 are used to guide the sheet and the maintain on the lower blades 7a, 7b or upper 6a, 6b according to the progress in the forming cycle. These strippers are only linked to tools in their horizontal movements.

Un cycle de formage peut être décomposé en six étapes successives, conformément aux figures 5 à 10.A forming cycle can be broken down into six successive steps, in accordance with Figures 5 to 10.

La figure 5 montre la première étape au cours de laquelle l'outil supérieur 6 forme l'ailette A2 qui est ouverte vers le haut, pour la première fois, et forme. l'ailette A1 qui est ouverte vers le bas, pour la seconde fois. Les dévétisseurs 13 et 14 guident et maintiennent le feuillard au cours du formage. A la deuxième étape l'outil supérieur 6 se dégage en se déplaçant vers le haut et les dévétisseurs maintiennent le feuillard embouti sur l'outil inférieur 7. A la troisième étape illustrée sur la figure 7, l'outil inférieur 7 se déplace horizontalement vers la droite et se met ainsi en position pour la réalisation de l'ailette A2 pour la seconde fois et de l'ailette A3 pour la première fois. La figure 8 montre la quatrième étape au cours de laquelle l'outil supérieur 6 forme l'ailette A3 qui est ouverte vers le bas, pour la première fois, et forme l'ailette A2 pour la seconde fois, les dévétisseurs guidant et maintenant la feuille au cours du formage. A la cinquième étape le feuillard embouti est maintenu par les dévétisseurs sur l'outil supérieur 6 qui se dégage. Enfin, la figure 10 illustre qu'à la sixième étape l'outil inférieur 7 se met en position pour effectuer le formage de l'ailette A3 pour la seconde fois et l'ailette A4 pour la première fois. A l'issu de ces six étapes, le cycle de formage reprend à la première étape.Figure 5 shows the first step during which the upper tool 6 forms the fin A2 which is open up, for the first time, and shape. the wing A1 which is open downwards, for the second time. The strippers 13 and 14 guide and maintain the strip during forming. At the second stage the upper tool 6 is released by moving towards the high and the strippers keep the strip stamped on the lower tool 7. In the third step illustrated in FIG. 7, the lower tool 7 moves horizontally to the right and thus position for the realization of the wing A2 for the second time and A3 fin for the first time. The Figure 8 shows the fourth step in which the upper tool 6 forms the fin A3 which is open down, for the first time, and forms the fin A2 for the second time, the strippers guiding and now the sheet during forming. At the fifth step the stamped strip is maintained by the strippers on the upper tool 6 which emerges. Finally, Figure 10 illustrates that in the sixth step the lower tool 7 moves into position to perform the forming the A3 fin for the second time and the fin A4 for the first time. At the end of these six stages, the forming cycle resumes at the first stage.

Comme il a été écrit plus haut, en se référant à la figure 1, les outillages utilisés jusqu'à présent présentent l'inconvénient majeur que l'espace de réception n'est pas uniforme le long des ondulations. L'invention propose un procédé qui permet de réaliser des outils qui pallient l'inconvénient de l'épaisseur irrégulière le long des ondulations.As it was written above, with reference to the Figure 1, the tools used so far have the major drawback that the space of reception is not uniform along the undulations. The invention provides a method which makes it possible to carry out tools which overcome the disadvantage of the thickness irregular along the undulations.

La figure 2 illustre le procédé selon l'invention. Cette figure montre les profilés conjugués d'une lame supérieure par exemple 6a et d'une lame inférieure 6b conférant entre eux au feuillard 4 l'ondulation de l'intercalaire 2, déterminée par les profils des lames de formage. L'épaisseur de l'intercalaire est désignée par la référence ep. On constate de part et d'autre de l'intercalaire 2 un jeu j/2 dont les dimensions sont exagérées par rapport à l'épaisseur du feuillard et qui est prévu pour prendre en compte par exemple un film de lubrifiant.FIG. 2 illustrates the method according to the invention. This figure shows the conjugate profiles of a blade upper for example 6a and a lower blade 6b conferring between them the strip 4 the ripple of tab 2, determined by the profiles of the blades of forming. The thickness of the interlayer is designated by the ep reference. We see on both sides of tab 2 a game d / 2 whose dimensions are exaggerated in relation to the thickness of the strip and which is planned to take into account for example a film of lubricant.

De façon générale, le procédé selon l'invention consiste à établir la courbe de l'intercalaire au centre de celui-ci et ensuite d'ajouter en direction normale à cette courbe, de part et d'autre de celle-ci, une distance constante d qui est égale à la somme de l'épaisseur ep de l'intercalaire et du jeu j nécessaire au formage, divisé par deux, c'est-à-dire à la formule : d = ep + j2 In general, the method according to the invention consists in establishing the curve of the interlayer at the center of it and then adding in a normal direction to this curve, on either side thereof, a distance constant d which is equal to the sum of the thickness ep of the interlayer and the clearance j necessary for forming, divided by two, that is to say to the formula: d = ep + j 2

A titre d'exemple, on décrira ci-après le procédé selon l'invention dans son application à un profilé d'ondulation sinusoïdale. La courbe qui sera donc une courbe sinusoïdale, indiquée en coordonnées cartésienne est par conséquent du type : Y= a sin (bx) By way of example, the method according to the invention will be described below in its application to a sine wave profile. The curve which will therefore be a sinusoidal curve, indicated in Cartesian coordinates is therefore of the type: Y = a sin (bx)

Pour déterminer les deux profils conjugués selon la figure 2, on calcule pour chaque point de la courbe, deux autres points situés sur la normale à cette courbe, de part et d'autre de celle-ci, à la distance constante d indiquée plus haut. Ce sont ces points qui définissent les deux profilés conjugués.To determine the two conjugate profiles according to the figure 2, we calculate for each point of the curve, two other points located on the normal to this curve, from on either side of it, at the constant distance d indicated above. These are the points that define the two profiles combined.

Plus précisément, pour une ondulation d'intercalaire sinusoÏdale, afin de déterminer les coordonnées cartésiennes des points appartenant aux profils conjugués, on calcule l'angle de la tangente au chaque point de la courbe de base, par exemple P1, puis on ajoute aux coordonnées cartésiennes x1, y1 de ce point :

  • dsin(+π) sur l'abscisse et dcos() sur l'ordonnée pour un profil conjugué et
  • dsin() sur l'abscisse et dcos(+π) sur l'ordonnée pour le second profil conjugué.
    • More precisely, for a sine wave ripple, in order to determine the Cartesian coordinates of the points belonging to the conjugate profiles, we calculate the angle of the tangent at each point of the base curve, for example P1, then we add to the coordinates Cartesian x1, y1 from this point:
  • dsin ( + π) on the abscissa and dcos () on the ordinate for a conjugate profile and
  • dsin () on the abscissa and dcos ( + π) on the ordinate for the second conjugate profile.

    • Les coordonnées cartésiennes xc1, xc2, yc1 et yc2 de ces deux points établis de part et d'autre de la courbe de base et qui sont situés sur les deux profils à obtenir sont comme suit : xc1 = x1 + d sin(+π) et yc1 = y1 + d cos() xc2 = x1 + d sin () et yc2 = y1 + d cos(+π) The Cartesian coordinates xc1, xc2, yc1 and yc2 of these two points established on either side of the base curve and which are located on the two profiles to be obtained are as follows: xc1 = x1 + d sin ( + π) and yc1 = y1 + d cos () xc2 = x1 + d sin () and yc2 = y1 + d cos ( + π)

    Les outils supérieur et inférieur ainsi déterminés sont réalisés avantageusement dans un acier fortement allié (molybdène cobalt, chrome, tungstène et vanadium) et traité à une très haute dureté de par exemple 66 Hrc. La définition mathématique du profil permet un mode de fabrication sur machine automatique.The upper and lower tools thus determined are advantageously made of a strongly steel alloy (molybdenum cobalt, chromium, tungsten and vanadium) and treated to a very high hardness of for example 66 Hrc. The mathematical definition of the profile allows a mode of manufacturing on automatic machine.

    Bien entendu, l'invention permet de réaliser des profils de formage d'intercalaires ondulés de toute forme souhaitée. Il suffit seulement d'établir, avantageusement mathématiquement, la courbe centrale de l'intercalaire et définir les points des profils de formage conjugués selon la méthode expliquée plus haut.Of course, the invention makes it possible to carry out corrugated interlayer forming profiles of any shape desired. It suffices only to establish, advantageously mathematically, the central curve of the interlayer and define the points of the conjugate forming profiles according to the method explained above.

    L'invention permet ainsi de former des feuillards d'une épaisseur constante tout en évitant des risques de déchirures, inhérents au procédé de fabrication d'intercalaires, selon l'état de la technique.The invention thus makes it possible to form strips of constant thickness while avoiding risks of tears inherent in the manufacturing process dividers, according to the state of the art.

    Claims (3)

    Outillage de formage d'éléments échangeurs thermique à surfaces d'échange thermique ondulés, notamment intercalaires, à partir d'un feuillard en un matériau déformable, tel du métal, entre deux surfaces présentant chacune un profilé ondulé en conséquence, du type comprenant au moins deux lames dont les faces en regard présentent lesdits profils ondulés de formage et qui sont écartés l'un de l'autre pour définir entre eux un espace de réception du feuillard à déformer, caractérisé en ce que les profils (A, B) sont configurés de façon que leur écart dans la direction de l'épaisseur de l'intercalaire est constante le long des ondulations dans l'espace entre les profils.Tools for forming heat exchanger elements with corrugated heat exchange surfaces, in particular spacers, from a strip of deformable material, such as metal, between two surfaces each having a corresponding corrugated profile, of the type comprising at least two blades whose facing faces have said corrugated forming profiles and which are spaced from one another to define between them a space for receiving the strip to be deformed, characterized in that the profiles (A, B) are configured so that their deviation in the direction of the thickness of the interlayer is constant along the undulations in the space between the profiles. Procédé de réalisation des profils selon la revendication 1, caractérisé en ce qu'il consiste à définir la courbe qui passe par le centre du feuillard formé entre les deux profils (A, B) et à établir comme profils de formage ceux que l'on obtient en ajoutant de part et d'autre de ladite courbe pour chaque point de celle-ci, une distance constante dans la direction normale à cette courbe.Profile production method according to claim 1, characterized in that it consists in defining the curve which passes through the center of the strip formed between the two profiles (A, B) and in establishing as forming profiles those which are obtains by adding on either side of said curve for each point thereof, a constant distance in the direction normal to this curve. Procédé selon la revendication 1, caractérisé en ce que la distance constante (d) est égale à la somme de l'épaisseur (ep) de l'intercalaire (2) et des jeux (j) nécessaires au formage, divisé par deux.Method according to claim 1, characterized in that the constant distance (d) is equal to the sum of the thickness (ep) of the interlayer (2) and the clearances (j) necessary for forming, divided by two.
    EP03290417A 2002-02-21 2003-02-20 Tool for forming undulated heat exhange surfaces for heat exchangers by cold folding a sheet and method for making the forming profiles of such a tool Withdrawn EP1338352A1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR0202215A FR2836077B1 (en) 2002-02-21 2002-02-21 TOOLS FOR FORMING CORRUGATED HEAT EXCHANGE SURFACES FOR A HEAT EXCHANGER, BY COLD BENDING OF A STRIP AND METHOD FOR PRODUCING THE FORMING PROFILES OF SUCH A TOOL
    FR0202215 2002-02-21

    Publications (1)

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    EP1338352A1 true EP1338352A1 (en) 2003-08-27

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    EP03290417A Withdrawn EP1338352A1 (en) 2002-02-21 2003-02-20 Tool for forming undulated heat exhange surfaces for heat exchangers by cold folding a sheet and method for making the forming profiles of such a tool

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    US (1) US7080540B2 (en)
    EP (1) EP1338352A1 (en)
    FR (1) FR2836077B1 (en)
    IL (1) IL154568A (en)

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    Publication number Priority date Publication date Assignee Title
    JP4345578B2 (en) * 2004-05-31 2009-10-14 株式会社デンソー Plate material press working equipment
    US8366765B2 (en) * 2009-09-18 2013-02-05 Medtronic Vascular, Inc. Helical stent with connections
    US9238260B2 (en) 2012-04-18 2016-01-19 Medtronic Vascular, Inc. Method and apparatus for creating formed elements used to make wound stents

    Citations (3)

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    Publication number Priority date Publication date Assignee Title
    GB584575A (en) * 1945-01-04 1947-01-17 Norman Isherwood And Company L Improvements in crimping machines
    WO1982002940A1 (en) * 1981-02-18 1982-09-02 Vidal Meza Gonzalo Dario Heat exchanger plate having distortion resistant uniform pleats
    US5694803A (en) * 1994-11-30 1997-12-09 Solar Turbines Incorporated Fin folding machine for corrugating sheet material

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    Publication number Priority date Publication date Assignee Title
    NL158407B (en) * 1974-09-11 1978-11-15 Philips Nv DEVICE FOR ZIG-ZAG FOLDING STRIP OR SHEET MATERIAL AND THE LIKE.
    US4346760A (en) * 1981-02-18 1982-08-31 Caterpillar Tractor Co. Heat exchanger plate having distortion resistant uniform pleats
    US4450705A (en) * 1981-02-18 1984-05-29 Caterpillar Tractor Co. Heat exchanger plate having distortion resistant uniform pleats

    Patent Citations (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB584575A (en) * 1945-01-04 1947-01-17 Norman Isherwood And Company L Improvements in crimping machines
    WO1982002940A1 (en) * 1981-02-18 1982-09-02 Vidal Meza Gonzalo Dario Heat exchanger plate having distortion resistant uniform pleats
    US5694803A (en) * 1994-11-30 1997-12-09 Solar Turbines Incorporated Fin folding machine for corrugating sheet material

    Also Published As

    Publication number Publication date
    IL154568A0 (en) 2003-09-17
    IL154568A (en) 2008-12-29
    US20040055355A1 (en) 2004-03-25
    FR2836077B1 (en) 2004-07-09
    FR2836077A1 (en) 2003-08-22
    US7080540B2 (en) 2006-07-25

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