EP0478507B1 - Process and apparatus for manufacturing heat echangers - Google Patents

Process and apparatus for manufacturing heat echangers Download PDF

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Publication number
EP0478507B1
EP0478507B1 EP19910810765 EP91810765A EP0478507B1 EP 0478507 B1 EP0478507 B1 EP 0478507B1 EP 19910810765 EP19910810765 EP 19910810765 EP 91810765 A EP91810765 A EP 91810765A EP 0478507 B1 EP0478507 B1 EP 0478507B1
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EP
European Patent Office
Prior art keywords
tubes
spreading
arbor
support
tube
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Expired - Lifetime
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EP19910810765
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German (de)
French (fr)
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EP0478507A1 (en
Inventor
Rudolf Lüthi
Walter Pauli
Roland Krebs
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Styner and Bienz AG
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Styner and Bienz AG
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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
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
    • B21D53/085—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal with fins places on zig-zag tubes or parallel tubes

Definitions

  • the present invention relates to a method for producing heat exchangers according to the preamble of claim 1.
  • a method is known from US-A-4,780,955.
  • the two straight legs of U-shaped tubes are inserted into the aligned openings formed by collars, whereupon the elbows of the tubes are supported by a support plate while the expanding mandrels are inserted from the straight ends of the tubes to bring them to the collars of the fins to press and thus establish a mutual connection.
  • the support plate is advanced against the direction of movement of the expanding mandrels at a speed or by a distance which should correspond to the shortening of the pipes as a result of their spreading.
  • the aim of the present invention is to remedy this deficiency.
  • This goal is achieved according to the features of claim 1.
  • the rigid support of the pipes at both ends makes it possible to keep the pipes under full pressure, regardless of the position of the expanding mandrel, and thus to determine the final position and length of the pipes after spreading, regardless of the tolerances .
  • the invention also relates to a plant for carrying out the method.
  • Figure 1 shows a package of heat exchanger fins 1, which are provided with openings which are delimited by curved collars 2.
  • the lamellae are stacked at a certain mutual distance from one another and rigidly clamped between two plates 3 and 4.
  • the successive openings or collar 2 of the lamellae each form a channel passing through the entire package, and the plates 3 and 4 are provided with holes 5 and 6, which are each in front of a channel of the lamella package 1.
  • the plate 4 is preceded by a further plate 7 with holes 8, the diameter of the holes 8 being smaller than the diameter of the holes 5 and 6.
  • Expansion mandrels 10 each with an expansion head 11, are used for expansion, and these expansion mandrels 10 can be pushed through the tubes 9 by means of a common drive, in particular a spindle drive, in order to expand these tubes so much that they collide with the collars 2 of the lamellae 1 pressed and firmly connected to the same.
  • the pressure acting on the tubes 9 from the expanding mandrels 10 is absorbed by a support plate 12 on which the tubes 9 are supported.
  • This support plate 12 is also provided with holes 13 which are dimensioned such that a driver 14 which can be detachably coupled to the front end of the expanding mandrel 10 can pass through.
  • the support plate 12 is not arranged rigidly, but can be moved in the direction of the arrow against the pressure direction of the expanding mandrels 10. It can also be moved transversely to the longitudinal direction of the tubes 9.
  • a prepared pipe 9 ' is shown on the right whose front end has a rolled constriction 15, and in which a driver 14 is inserted.
  • the constriction 15 and the driver 14 are dimensioned such that a new tube can be drawn into a plate pack 1 from a magazine (not shown) by means of this driver.
  • the plate pack 1 is not only rigidly clamped in the stacking direction between the plates 3 and 4, but it is also clamped practically rigid in the transverse direction.
  • Figure 2 shows a view of the plate pack with tubes 9 with the plates 3 and 12 removed.
  • the plate pack 1 is clamped between a lower support 18 and an upper clamping frame with cross sections 16 and longitudinal sections 17, which is pressed onto the plate pack by means of clamping means (not shown).
  • the support 18 has lateral support profiles 19 for the plate pack 1. It is thus ensured that the plate pack does not buckle under the considerable pressure of all expanding mandrels 10 which are active at the same time.
  • FIG. 1 shows the operating state during the expansion of the tubes, only one tube 9 with its expanding mandrel 10 being shown in FIG. But actually at the same time expanded as many pipes as are shown in FIG. 2, for example.
  • the expanding mandrel 10 with the expanding head 11 is advanced from left to right in FIG. 1, the expanding head 11 progressively expanding the tube and pressing it against the fins 1.
  • the tube 9 is shortened by the pressure in the longitudinal direction and the plastic deformation in the region of the expansion head 11, this shortening being somewhat dependent on the tolerances of the tube.
  • This shortening of the tube 9, which occurs anyway, but is not completely controllable, is now converted according to the invention into a controlled shortening by moving the support plate 12, which absorbs the pressure exerted on the tubes in the longitudinal direction, to the left in FIG.
  • This movement takes place in a rigid speed ratio to the rate of penetration of the expanding mandrels 10, the speed of the plate, for example in the case of aluminum tubes, corresponding to 1.5 to 2.5% of the rate of penetration of the expanding mandrels 10.
  • the speed or the path of the support plate 12 is dimensioned such that this path is in any case greater than the shortening of the tube 9 that occurs anyway.
  • the tube 9 is therefore constantly under additional pressure during expansion by the advance of the support plate 12 set, which increases the plastic shortening of the tube to a predetermined value given by the path of the support plate 12.
  • this has the double advantage that, on the one hand, all the pipes are brought to the same length, or protrude exactly the same distance from the plate pack 1, namely on the one hand up to the plate 7 and on the other hand up to the plate 12.
  • the expansion of the tube takes place up to the front end, which is supported on the plate 12, in that the coupling member 14 passes through the hole 13 in the support plate 12 and the expansion head 11 also so far can penetrate into the hole 13 that he widens the tube 9 to the end.
  • the expanding mandrel is fully retracted behind the plate 7, whereupon the plate pack with the retracted tubes 9 is removed and replaced by a new plate pack. If the new disk set is clamped rigidly again in the manner described, all expanding mandrels 10 are pushed forward together after the coupling member 14 has been removed therefrom. Here, the support plate 12 is extended up or down in the direction of its plane, so that the expanding mandrels can be pushed freely up to the bar magazine. There, all expanding mandrels are then coupled, each with a coupling member 14, and then withdrawn in order to pull a new tube into the plate pack 1 with the coupling element 14.
  • the pipes are subjected to tension and, if necessary, are straightened in the plate pack.
  • the tubes 9 are drawn in here until the expansion head 11 with its largest diameter is at the level of the inner surface (on the right in FIG. 1) of the plate 7.
  • the support plate 12 is brought back into the operating position shown and is placed against the pipe ends. All pipes are placed under pressure prestressing regardless of small differences in length such that their ends are slipped over the expansion head 11 and expanded in the process until they abut the plate 7.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Assembly (AREA)

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Wärmetauschern gemäss Oberbegriff des Anspruchs 1. Ein solches Verfahren ist aus der US-A-4,780,955 bekannt. Die beiden geraden Schenkel von U-förmigen Rohren werden dabei in die fluchtenden, durch Kragen gebildeten Oeffnungen eingeschoben, worauf die Bogen der Rohre mittels einer Stützplatte gestützt werden während die Spreizdorne von den geraden Enden der Rohre eingeführt werden, um dieselben an die Kragen der Lamellen anzupressen und damit eine gegenseitige Verbindung herzustellen. Die Stützplatte wird während des Spreizens der Rohre entgegen der Bewegungsrichtung der Spreizdorne mit einer Geschwindigkeit bzw. um einen Weg vorgeschoben, der gerade der Verkürzung der Rohre infolge deren Spreizung entsprechen soll. Es ist jedoch schwierig, die Geschwindigkeit bzw. den Weg der Stützplatte genau so zu wählen, dass sich keine unkontrollierte Verkürzung der Rohre ergibt, dies insbesondere deshalb, weil die Toleranzen der verwendeten Rohre stark streuen und daher deren Verkürzung durch die Spreizung unbestimmt ist.The present invention relates to a method for producing heat exchangers according to the preamble of claim 1. Such a method is known from US-A-4,780,955. The two straight legs of U-shaped tubes are inserted into the aligned openings formed by collars, whereupon the elbows of the tubes are supported by a support plate while the expanding mandrels are inserted from the straight ends of the tubes to bring them to the collars of the fins to press and thus establish a mutual connection. During the spreading of the pipes, the support plate is advanced against the direction of movement of the expanding mandrels at a speed or by a distance which should correspond to the shortening of the pipes as a result of their spreading. However, it is difficult to choose the speed or the path of the support plate in such a way that there is no uncontrolled shortening of the pipes, in particular because the tolerances of the pipes used vary widely and therefore their shortening is indefinite due to the spread.

Ziel der vorliegenden Erfindung ist es, diesen Mangel zu beheben. Dieses Ziel wird gemäss den Merkmalen des Anspruchs 1 erreicht. Durch die starre Abstützung der Rohre an beiden Enden wird es möglich, die Rohre auf ihrer ganzen Länge, unabhängig von der Lage des Spreizdorns unter Vordruck zu halten und damit die endgültige Lage und Länge der Rohre nach erfolgter Spreizung genau zu bestimmen, unabhängig von den Toleranzen. Es bietet keine Schwierigkeiten, den Weg bzw. die Geschwindigkeit der beweglichen Abstützung so hoch zu wählen, dass er bzw. sie für alle Rohre die im ungespreizten Zustand verschiedene Länge und Wandstärke aufweisen können, über der für alle Rohre zu erwartenden Verkürzung infolge der Spreizung zu wählen.The aim of the present invention is to remedy this deficiency. This goal is achieved according to the features of claim 1. The rigid support of the pipes at both ends makes it possible to keep the pipes under full pressure, regardless of the position of the expanding mandrel, and thus to determine the final position and length of the pipes after spreading, regardless of the tolerances . There is no difficulty in choosing the path or the speed of the movable support so high that it can have, for all pipes, the length and wall thickness that are different in the unspread state, above the shortening due to the spread that is to be expected for all pipes choose.

Die Erfindung betrifft auch eine Anlage zur Durchführung des Verfahrens.The invention also relates to a plant for carrying out the method.

Die Erfindung wird nun anhand der Zeichnung näher erläutert.

  • Figur 1 zeigt schematisch den Aufweitvorgang und Teile der Anlage und
  • Figur 2 ist eine Stirnansicht eines Lamellenpaketes mit Stützorganen für dasselbe.
The invention will now be explained in more detail with reference to the drawing.
  • Figure 1 shows schematically the expansion process and parts of the system and
  • Figure 2 is an end view of a plate pack with support members for the same.

Figur 1 zeigt ein Paket von Wärmetauscher-Lamellen 1, welche mit Durchbrechungen versehen sind, die durch gewölbte Kragen 2 begrenzt sind. Mittels dieser Kragen 2 sind die Lamellen in bestimmtem gegenseitigem Abstand zu einem Paket gestapelt und zwischen zwei Platten 3 und 4 starr eingespannt. Die hintereinander liegenden Durchbrechungen, bzw. Kragen 2 der Lamellen bilden je einen das ganze Paket durchsetzenden Kanal, und die Platten 3 und 4 sind mit Löchern 5 und 6 versehen, welche je vor einem Kanal des Lamellenpaketes 1 liegen. Der Platte 4 ist eine weitere Platte 7 mit Löchern 8 vorgelagert, wobei der Durchmesser der Löcher 8 kleiner ist als der Durchmesser der Löcher 5 und 6.Figure 1 shows a package of heat exchanger fins 1, which are provided with openings which are delimited by curved collars 2. By means of this collar 2, the lamellae are stacked at a certain mutual distance from one another and rigidly clamped between two plates 3 and 4. The successive openings or collar 2 of the lamellae each form a channel passing through the entire package, and the plates 3 and 4 are provided with holes 5 and 6, which are each in front of a channel of the lamella package 1. The plate 4 is preceded by a further plate 7 with holes 8, the diameter of the holes 8 being smaller than the diameter of the holes 5 and 6.

Zur Verbindung des Lamellenpaketes 1 mit Rohren werden diese Rohre 9 gemäss Figur 1 in die Kanäle des Lamellenpaketes 1 eingezogen und dann aufgeweitet. Zum Aufweiten dienen Spreizdorne 10 mit je einem Spreizkopf 11, und diese Spreizdorne 10 können mittels eines gemeinsamen Antriebes, insbesondere Spindelantriebes durch die Rohre 9 durchgestossen werden, um diese Rohre so stark aufzuweiten, dass sie gegen die Kragen 2 der Lamellen 1 angepresst und fest mit denselben verbunden werden. Der von den Spreizdornen 10 auf die Rohre 9 wirkende Druck wird aufgenommen durch eine Stützplatte 12, auf welche sich die Rohre 9 abstützen. Diese Stützplatte 12 ist ebenfalls mit Löchern 13 versehen, welche so bemessen sind, dass ein mit dem vorderen Ende des Spreizdorns 10 lösbar gekuppelter Mitnehmer 14 durchtreten kann. Die Stützplatte 12 ist nicht starr angeordnet, sondern kann in Richtung des Pfeils entgegen der Druckrichtung der Spreizdorne 10 bewegt werden. Sie kann ferner quer zur Längsrichtung der Rohre 9 wegbewegt werden. In Figur 1 ist rechts ein vorbereitetes Rohr 9′ dargestellt dessen vorderes Ende eine angerollte Verengung 15 aufweist, und in welches ein Mitnehmer 14 eingesetzt ist. Die Verengung 15 und der Mitnehmer 14 sind so bemessen, dass mittels dieses Mitnehmers jeweils ein neues Rohr aus einem nicht dargestellten Magazin in ein Lamellenpaket 1 eingezogen werden kann.To connect the plate pack 1 to pipes, these pipes 9 are drawn into the channels of the plate pack 1 according to FIG. 1 and then widened. Expansion mandrels 10, each with an expansion head 11, are used for expansion, and these expansion mandrels 10 can be pushed through the tubes 9 by means of a common drive, in particular a spindle drive, in order to expand these tubes so much that they collide with the collars 2 of the lamellae 1 pressed and firmly connected to the same. The pressure acting on the tubes 9 from the expanding mandrels 10 is absorbed by a support plate 12 on which the tubes 9 are supported. This support plate 12 is also provided with holes 13 which are dimensioned such that a driver 14 which can be detachably coupled to the front end of the expanding mandrel 10 can pass through. The support plate 12 is not arranged rigidly, but can be moved in the direction of the arrow against the pressure direction of the expanding mandrels 10. It can also be moved transversely to the longitudinal direction of the tubes 9. In Figure 1, a prepared pipe 9 'is shown on the right whose front end has a rolled constriction 15, and in which a driver 14 is inserted. The constriction 15 and the driver 14 are dimensioned such that a new tube can be drawn into a plate pack 1 from a magazine (not shown) by means of this driver.

Wie in Figur 2 angedeutet, ist das Lamellenpaket 1 nicht nur in Stapelrichtung zwischen den Platten 3 und 4 starr eingespannt, sondern es ist auch in Querrichtung praktisch starr eingespannt. Figur 2 zeigt eine Ansicht des Lamellenpakets mit Rohren 9 bei entfernten Platten 3 und 12. Das Lamellenpaket 1 ist eingespannt zwischen einem unteren, Auflager 18 und einem oberen Spannrahmen mit Querprofilen 16 und Längsprofilen 17, welcher mittels nicht dargestellter Spannmittel auf das Lamellenpaket gepresst wird. Das Auflager 18 weist seitliche Stützprofile 19 für das Lamellenpaket 1 auf. Es ist damit dafür gesorgt, dass das Lamellenpaket unter dem erheblichen Druck aller gleichzeitig wirksamen Spreizdorne 10 nicht ausknickt.As indicated in Figure 2, the plate pack 1 is not only rigidly clamped in the stacking direction between the plates 3 and 4, but it is also clamped practically rigid in the transverse direction. Figure 2 shows a view of the plate pack with tubes 9 with the plates 3 and 12 removed. The plate pack 1 is clamped between a lower support 18 and an upper clamping frame with cross sections 16 and longitudinal sections 17, which is pressed onto the plate pack by means of clamping means (not shown). The support 18 has lateral support profiles 19 for the plate pack 1. It is thus ensured that the plate pack does not buckle under the considerable pressure of all expanding mandrels 10 which are active at the same time.

Figur 1 zeigt den Betriebszustand während des Aufweitens der Rohre, wobei in Figur 1 nur ein Rohr 9 mit seinem Spreizdorn 10 gezeigt ist. Tatsächlich werden aber gleichzeitig soviele Rohre aufgeweitet, wie beispielsweise in Figur 2 dargestellt sind. Der Spreizdorn 10 mit dem Spreizkopf 11 wird dabei in Figur 1 von links nach rechts vorgeschoben, wobei der Spreizkopf 11 das Rohr fortschreitend aufweitet und gegen die Lamellen 1 presst. Durch den Druck in Längsrichtung und die plastische Verformung im Bereich des Spreizkopfes 11 wird das Rohr 9 verkürzt, wobei diese Verkürzung etwas von den Toleranzen des Rohres abhängt. Diese ohnehin erfolgende, aber nicht völlig kontrollierbare Verkürzung des Rohres 9 wird nun gemäss der Erfindung in eine kontrollierte Verkürzung übergeführt, indem die Stützplatte 12, welche den auf die Rohre ausgeübten Druck in Längsrichtung aufnimmt, in Figur 1 nach links bewegt wird. Diese Bewegung findet in einem starren Geschwindigkeitsverhältnis zur Eindringgeschwindkeitkeit der Spreizdorne 10 statt, wobei die Geschwindigkeitkeit der Platte beispielsweise im Falle von Aluminiumrohren 1,5 bis 2,5 % der Eindringgeschwindigkeit der Spreizdorne 10 entspricht. Jedenfalls wird die Geschwindigkeit, bzw. der Weg der Stützplatte 12 so bemessen, dass dieser Weg auf alle Fälle grösser ist als die ohnehin eintretende Verkürzung des Rohres 9. Das Rohr 9 wird also während des Ausweitens durch das Vordringen der Stützplatte 12 dauernd unter zusätzlichen Druck gesetzt, welcher die plastische Verkürzung des Rohres erhöht auf einen vorbestimmten, durch den Weg der Stützplatte 12 gegebenen Wert. Wie erwähnt, ist damit der doppelte Vorteil verbunden, dass einerseits alle Rohre auf dieselbe Länge gebracht werden, bzw. genau gleich weit aus dem Lamellenpaket 1 vorstehen, nämlich einerseits bis zur Platte 7 und andererseits bis zur Platte 12. Zudem findet keine Längsverschiebung von Lamellen statt. Die Ausweitung des Rohres findet dabei bis zum vorderen, an der Platte 12 abgestützten Ende statt, indem das Kupplungsorgan 14 durch das Loch 13 der Stützplatte 12 durchtreten und der Spreizkopf 11 ebenfalls so weit in das Loch 13 eindringen kann, dass er das Rohr 9 bis zum Ende aufweitet.FIG. 1 shows the operating state during the expansion of the tubes, only one tube 9 with its expanding mandrel 10 being shown in FIG. But actually at the same time expanded as many pipes as are shown in FIG. 2, for example. The expanding mandrel 10 with the expanding head 11 is advanced from left to right in FIG. 1, the expanding head 11 progressively expanding the tube and pressing it against the fins 1. The tube 9 is shortened by the pressure in the longitudinal direction and the plastic deformation in the region of the expansion head 11, this shortening being somewhat dependent on the tolerances of the tube. This shortening of the tube 9, which occurs anyway, but is not completely controllable, is now converted according to the invention into a controlled shortening by moving the support plate 12, which absorbs the pressure exerted on the tubes in the longitudinal direction, to the left in FIG. This movement takes place in a rigid speed ratio to the rate of penetration of the expanding mandrels 10, the speed of the plate, for example in the case of aluminum tubes, corresponding to 1.5 to 2.5% of the rate of penetration of the expanding mandrels 10. In any case, the speed or the path of the support plate 12 is dimensioned such that this path is in any case greater than the shortening of the tube 9 that occurs anyway. The tube 9 is therefore constantly under additional pressure during expansion by the advance of the support plate 12 set, which increases the plastic shortening of the tube to a predetermined value given by the path of the support plate 12. As mentioned, this has the double advantage that, on the one hand, all the pipes are brought to the same length, or protrude exactly the same distance from the plate pack 1, namely on the one hand up to the plate 7 and on the other hand up to the plate 12. In addition, there is no longitudinal displacement of the plates instead of. The expansion of the tube takes place up to the front end, which is supported on the plate 12, in that the coupling member 14 passes through the hole 13 in the support plate 12 and the expansion head 11 also so far can penetrate into the hole 13 that he widens the tube 9 to the end.

Ist der Aufweitvorgang in diesem Sinne beendet, wird der Spreizdorn vollständig bis hinter die Platte 7 zurückgezogen, worauf das Lamellenpaket mit den eingezogenen Rohren 9 entfernt und durch ein neues Lamellenpaket ersetzt wird. Ist das neue Lamellenpaket in der beschriebenen Weise wieder starr eingespannt, werden alle Spreizdorne 10 gemeinsam vorgeschoben, nachdem das Kupplungsorgan 14 von denselben entfernt worden ist. Hierbei ist die Stützplatte 12 in Richtung ihrer Ebene nach oben oder unten ausgefahren, sodass die Spreizdorne ungehindert bis zum Stangenmagazin vorgeschoben werden können. Dort werden dann alle Spreizdorne mit je einem Kupplungsorgan 14 gekuppelt und dann zurückgezogen, um mit dem Kupplungselement 14 ein neues Rohr in das Lamellenpaket 1 einzuziehen. Während des Einziehens sind die Rohre auf Zug beansprucht und werden nötigenfalls im Lamellenpaket geradegerichtet. Die Rohre 9 werden hierbei eingezogen, bis der Spreizkopf 11 sich mit seinem grössten Durchmesser auf der Höhe der Innenfläche (rechts in Fig. 1) der Platte 7 befindet. Sind alle Rohre vollständig bis zur vorbestimmten Position eingezogen, wird die Stützplatte 12 wieder in die dargestellte Betriebslage gebracht und gegen die Rohrenden angelegt. Alle Rohre werden dabei unabhängig von geringen Längenunterschieden derart unter Druckvorspannung gesetzt, dass ihre Enden über den Spreizkopf 11 gestülpt und dabei aufgeweitet werden bis sie an der Platte 7 anstehen. Sodann beginnt die beschriebene Ausweitung der Rohre durch das Eindringen der Spreizköpfe 11 in dieselben, währenddem die Stützplatte 12 in der beschriebenen Weise kontrolliert weiter vorgeschoben wird, um die Druckspannung in den Rohren 9 so zu gestalten, dass sie in kontrollierter Weise verkürzt und dauernd an der Platte 7 abgestützt bleiben. In dieser Weise werden die oben erwähnten Ziele erreicht, dass alle Rohre 9 unabhängig von gewissen Abweichungen im Querschnitt und in der Länge nach dem Aufweiten gleiche Länge aufweisen, je auf einer Seite gleich weit aus dem Lamellenpaket 1 vorstehen und keine Längsverschiebung der Lamellen 1 verursachen.If the expansion process is ended in this sense, the expanding mandrel is fully retracted behind the plate 7, whereupon the plate pack with the retracted tubes 9 is removed and replaced by a new plate pack. If the new disk set is clamped rigidly again in the manner described, all expanding mandrels 10 are pushed forward together after the coupling member 14 has been removed therefrom. Here, the support plate 12 is extended up or down in the direction of its plane, so that the expanding mandrels can be pushed freely up to the bar magazine. There, all expanding mandrels are then coupled, each with a coupling member 14, and then withdrawn in order to pull a new tube into the plate pack 1 with the coupling element 14. During the pulling-in process, the pipes are subjected to tension and, if necessary, are straightened in the plate pack. The tubes 9 are drawn in here until the expansion head 11 with its largest diameter is at the level of the inner surface (on the right in FIG. 1) of the plate 7. When all the pipes have been drawn in completely to the predetermined position, the support plate 12 is brought back into the operating position shown and is placed against the pipe ends. All pipes are placed under pressure prestressing regardless of small differences in length such that their ends are slipped over the expansion head 11 and expanded in the process until they abut the plate 7. Then the described expansion of the tubes begins by the penetration of the expansion heads 11, while the support plate 12 is pushed forward in the manner described in order to design the compressive stress in the tubes 9 in such a way that they shorten in a controlled manner and continuously on the Plate 7 remain supported. In this way, the The objectives mentioned above achieved that all tubes 9, regardless of certain deviations in cross-section and in length after expansion, have the same length, protrude equally far from the plate pack 1 on one side and do not cause any longitudinal displacement of the plates 1.

Claims (10)

  1. Method for the manufacture of heat exchangers, wherein tubes (9) are inserted in a fin package (1) and each tube is subsequently widened by means of an expanding arbor (10, 11), a support (12) for one of the ends of each tube being displaced in a direction which is opposed to that of the motion of the spreading arbor (10, 11) through the tubes, in order to determine the shortening of the tubes (9), characterised in that during the widening procedure, the tubes (9) are supported in a predetermined position by means of rigid supports in such a manner that their final length and their position in the fin package (1) after the widening procedure are determined by the rigid support.
  2. Method according to claim 1, wherein the support (12) is displaced at a speed which is proportional to that of the spreading arbor (10, 11), characterised in that the path of the support (12) is greater than the shortening of the tubes (9) on account of their widening.
  3. Method according to claim 1 or 2, characterised in that the speed resp. the path of the support (12) amounts to 1.5 to 2.5% of the speed resp. the path of the spreading arbor (10, 11).
  4. Method according to any one of claims 1 to 3, characterised in that the tubes (9') are inserted into the fin package by means of the spreading arbors (10).
  5. Apparatus for carrying out the method according to claim 1, comprising at least one spreading arbor (10, 11) having a supporting member (12) for one of the ends of the tubes which is displaceable in its supporting direction, and a drive for the displaceable supporting member (12) whose speed, speed development, or path is selectable, characterised by a second supporting member, e.g. a plate (7), for the other ends of the tubes, which is stationary in the supporting direction.
  6. Apparatus according to claim 5, characterised in that the supporting member (12), e.g. a plate, is displaceable transversally to is supporting direction.
  7. Apparatus according to claim 5 or 6, characterised in that the spreading arbor resp. each of the spreading arbors (10, 11) is capable of being coupled to one end of a tube in order to insert the latter into the fin package, detachable coupling elements (14) being provided.
  8. Apparatus according to any one of claims 5 to 7, characterised by a tube magazine from which the tubes (9') are extracted by means of a respective spreading arbor (10, 11) each.
  9. Apparatus according to any one of claims 5 to 8, characterised by a chucking device (3, 4, 16, 17) for fin packages (1).
  10. Apparatus according to any one of claims 5 to 9, characterised in that a number or all of the spreading arbors (10, 11) are capable of being driven in common.
EP19910810765 1990-09-28 1991-09-27 Process and apparatus for manufacturing heat echangers Expired - Lifetime EP0478507B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH313490A CH681565A5 (en) 1990-09-28 1990-09-28
CH3134/90 1990-09-28

Publications (2)

Publication Number Publication Date
EP0478507A1 EP0478507A1 (en) 1992-04-01
EP0478507B1 true EP0478507B1 (en) 1995-03-29

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EP19910810765 Expired - Lifetime EP0478507B1 (en) 1990-09-28 1991-09-27 Process and apparatus for manufacturing heat echangers

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EP (1) EP0478507B1 (en)
CH (1) CH681565A5 (en)
DE (1) DE59105043D1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4343820A1 (en) * 1993-12-22 1995-06-29 Behr Gmbh & Co Stretching of oval metal tubes by drawing
GB0307465D0 (en) * 2003-04-01 2003-05-07 Pierce David B Tube finning machine and method
CZ301687B6 (en) * 2008-11-14 2010-05-26 Lapácek@František Pressed-in joint of heating body pipe and lamella, process of its manufacture and tool for making the process

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3457620A (en) * 1967-03-23 1969-07-29 Roland A Ares Method of making a prestressed heat exchanger
JPS6056426A (en) * 1983-09-09 1985-04-02 Hitachi Ltd Tube expansion press for heat exchanger
US4584765A (en) * 1984-04-30 1986-04-29 Carrier Corporation Apparatus for assembling tubes in a heat exchanger
US4734969A (en) * 1986-10-16 1988-04-05 Carrier Corporation Floating rod lacer for automatic coil assembly
US4780955A (en) * 1987-05-20 1988-11-01 Crown Unlimited Machine, Inc. Apparatus for making a tube and fin heat exchanger

Also Published As

Publication number Publication date
CH681565A5 (en) 1993-04-15
EP0478507A1 (en) 1992-04-01
DE59105043D1 (en) 1995-05-04

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