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EP0298340B1 - Device for the production of a collecting tube section by powder metallurgy - Google Patents

Device for the production of a collecting tube section by powder metallurgy Download PDF

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Publication number
EP0298340B1
EP0298340B1 EP88110264A EP88110264A EP0298340B1 EP 0298340 B1 EP0298340 B1 EP 0298340B1 EP 88110264 A EP88110264 A EP 88110264A EP 88110264 A EP88110264 A EP 88110264A EP 0298340 B1 EP0298340 B1 EP 0298340B1
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EP
European Patent Office
Prior art keywords
recesses
collecting tube
profiled tubes
shell
half rings
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
Application number
EP88110264A
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German (de)
French (fr)
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EP0298340A1 (en
Inventor
Christian Greune
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MTU Aero Engines AG
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MTU Motoren und Turbinen Union Muenchen GmbH
Priority date (The priority date 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 date listed.)
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Publication of EP0298340A1 publication Critical patent/EP0298340A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates

Definitions

  • the invention relates to a device for powder-metallurgical production of a header section of a heat exchanger block and its connection to a plurality of profile tubes permanently connected thereto.
  • a disadvantage of this arrangement is that only a boundary surface of the wall section to be formed is defined by the hollow shape.
  • the wall thickness is determined by the bulk quantity, with one difficulty being to keep the wall thickness tolerances low. This is particularly difficult due to the close arrangement of the large number of profile tubes.
  • the object of the invention is to provide a device according to the preamble of the main claim, in which an uncomplicated, quick and economical production of a heat exchanger block is made possible, while at the same time a precisely defined wall thickness of the header pipes can be achieved.
  • the main advantage of the invention can be seen in the fact that the profile tubes can be quickly brought into the corresponding position and are positioned exactly.
  • the profile tubes are plugged onto the pins and are thereby supported from the inside, as a result of which the powder metallurgical material to be filled into the cavity can be filled or compressed with high pressure without fear of deformation of the profile tubes.
  • the dimensions of the cavity are defined, so that the wall thickness of the manifold wall section to be produced can be produced with small tolerances. Finally, a quick and easy opening of the device and removal of the finished component is guaranteed.
  • the pins protrude into the cutouts of the half rings. This ensures that the profile tubes are supported from the inside in the entire area of the passage through the cavity.
  • two inner shells are provided, the recesses of the radially inner inner shell having a shape and size such that the pins but not the profile tubes fit through.
  • the profile tubes protrude somewhat beyond the wall section, so that additional soldered connections can be made between the profile tube and the wall section.
  • the cavity is preferably filled with a sinterable powder by a spraying process, this powder being metal powder coated with plastic. This ensures rapid filling and good compression of the cavity.
  • a heat exchanger block 1 shown in Fig. 1 consists essentially of an inlet header 2 and an axially parallel outlet header 3, which are connected to each other by a plurality of U-shaped curved profile tubes.
  • a fluid flows from the inlet header 2 through the profile tubes 4 to the outlet header 3.
  • a gas flow 15 is directed perpendicular to the profile tubes 4 (cross / counterflow), with heat exchange between the two fluids taking place via the walls of the profile tubes 4.
  • the profile tubes 4 can have round, elliptical or other streamlined cross sections.
  • the profile tubes 4 are positioned by spacers 16.
  • Fig. 2 shows the device according to the invention, in which a number of half rings 5 are arranged side by side on a foundation 14.
  • the half rings 5 are braced against one another by tensioning devices 8a and 8b and fixed on the foundation 14 via tensioning devices 7a and 7b.
  • Radially inside the half rings 5 are spaced apart by a sleeve-like cavity 9, two concentric inner shells 10a and 10b are arranged.
  • a half-cylinder 12 is again provided radially inside the inner shell 10b, which is not fixed to the foundation 14, but remains pullable downward.
  • the half rings 5 are - as can be seen in Fig. 3 - provided with a number of recesses 6, which are each provided on the parting lines of two adjacent half rings 5.
  • the recesses 6 have a shape that corresponds exactly to the outer contour of the profile tubes 4, so that the profile tubes 4 can be inserted through the recesses 6.
  • cutouts 11a and 11b are likewise provided in the half shells 10a and 10b.
  • the recesses 11a located in the radially outer half-shell 10a have the same shape and size on how the recesses 6, so that the profile tubes 4 are to be pushed through here.
  • the recesses 11b have the shape of the inner contour of the profile tubes 4, so that the inner shell 10b serves as a stop for the inserted profile tubes 4.
  • pins 13 are attached, which also have the shape of the inner contour of the profile tubes 4. These pins 13 are inserted through the recesses 11 a and 11 b and protrude into the recesses 6 of the half rings 5.
  • a profile tube 4 shown in FIG. 2 is inserted through the cutouts 6 and 11, at the same time enclosing a pin 13 in its end section and being supported on the inner shell 10b.
  • Fig. 4 shows the two concentric inner shells 10a and 10b in perspective, both of which are provided with a number of regularly distributed, coaxial bores 11a and 11b.
  • Fig. 5 shows in perspective the half cylinder 12 with the attached pin 13, which are adapted to the inner contour of the profile tubes 4.
  • FIG. 6 shows an axial section through a pin 13. 17 different embodiments can be seen above and below the center line. An embodiment with only one inner shell 10b can be seen above the center line 17, the profile tubes 4 terminating with the inner surface of the wall section formed in the hollow mold 9.
  • the pins 13 are connected to the half cylinder 12 by means of welded connections 18. In other embodiments, other types of connection such as soldering, screwing, gluing or sintering are conceivable.
  • the wall sections produced in this way with attached profile tubes are assembled, whereby the header tubes 2 and 3 are formed.
  • the connection can be made by sintering, soldering or welding.
  • the wall sections expediently have about 1/4 the length of the header pipes 2 or 3, so that 8 components together form a heat exchanger block 1.
  • the invention is not limited to the embodiment shown, but can be used analogously for every conceivable manifold shape, without departing from the basic idea of the invention.
  • the inner shells 10a, 10b, the half rings 5 and the half cylinder 12 could have a flat shape in their central section.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Powder Metallurgy (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur pulvermetallurgischen Herstellung eines Sammelrohrabschnittes eines Wärmetauscherblockes und dessen Verbindung mit einer Vielzahl unlösbar daran angeschlossener Profilrohre.The invention relates to a device for powder-metallurgical production of a header section of a heat exchanger block and its connection to a plurality of profile tubes permanently connected thereto.

Aus der DE-PS 33 24 915 ist ein Verfahren zur Herstellung eines derartigen Wärmetauscherblockes bekannt. Hierbei werden die Profilrohre in vorgegebene Durchbrüche einer Hohlform gesteckt und letztere mit Sinterpulver gefüllt. Nach dem Sintervorgang bildet dieses einen Wandabschnitt des Sammelrohres, wobei die Profilrohre fest und gasdicht mit dem Wandabschnitt verbunden sind.From DE-PS 33 24 915 a method for producing such a heat exchanger block is known. The profile tubes are inserted into predetermined openings in a hollow mold and the latter is filled with sinter powder. After the sintering process, this forms a wall section of the header pipe, the profile pipes being connected to the wall section in a fixed and gas-tight manner.

Nachteilig bei dieser Anordnung wirkt sich aus, daß durch die Hohlform lediglich eine Begrenzungsfläche des zu bildenden Wandabschnittes festgelegt ist. Die Wanddicke ist durch die Schüttmenge vorgegeben, wobei eine Schwierigkeit darin besteht, die Wandstärketoleranzen gering zu halten. Dies wird vor allem durch die enge Anordnung der Vielzahl von Profilrohren erschwert.A disadvantage of this arrangement is that only a boundary surface of the wall section to be formed is defined by the hollow shape. The wall thickness is determined by the bulk quantity, with one difficulty being to keep the wall thickness tolerances low. This is particularly difficult due to the close arrangement of the large number of profile tubes.

Aufgabe der Erfindung ist es, eine Vorrichtung nach dem Oberbegriff des Hauptanspruches zu schaffen, bei der eine unkomplizierte, schnelle und wirtschaftliche Herstellung eines Wärmetauscherblockes ermöglicht wird, wobei gleichzeitig eine genau festgelegte Wandstärke der Sammelrohre erzielbar ist.The object of the invention is to provide a device according to the preamble of the main claim, in which an uncomplicated, quick and economical production of a heat exchanger block is made possible, while at the same time a precisely defined wall thickness of the header pipes can be achieved.

Gelöst wird die Aufgabe durch die im Kennzeichen des Hauptanspruchs aufgeführten Merkmale.The task is solved by the features listed in the characterizing part of the main claim.

Der wesentliche Vorteil der Erfindung ist darin zu sehen, daß die Profilrohre schnell in die entsprechende Position zu bringen sind und exakt positioniert sind. Die Profilrohre werden dabei auf die Zapfen aufgesteckt und erfahren dadurch eine Stützung von innen, wodurch der in den Hohlraum einzufüllende pulvermetallurgische Werkstoff mit hohem Druck eingefüllt bzw. verdichtet werden kann, ohne daß eine Verformung der Profilrohre zu befürchten ist.The main advantage of the invention can be seen in the fact that the profile tubes can be quickly brought into the corresponding position and are positioned exactly. The profile tubes are plugged onto the pins and are thereby supported from the inside, as a result of which the powder metallurgical material to be filled into the cavity can be filled or compressed with high pressure without fear of deformation of the profile tubes.

Gleichzeitig ist der Hohlraum in seinen Ausmaßen festgelegt, so daß die Wandstärke des herzustellenden Sammelrohr-Wandabschnittes mit geringen Toleranzen herstellbar ist. Schließlich ist eine schnelle und leichte Öffnung der Vorrichtung und Entnahme des gefertigten Bauteiles gewährleistet.At the same time, the dimensions of the cavity are defined, so that the wall thickness of the manifold wall section to be produced can be produced with small tolerances. Finally, a quick and easy opening of the device and removal of the finished component is guaranteed.

In einer bevorzugten Ausführungsform ragen die Zapfen bis in die Aussparungen der Halbringe hinein. Hierdurch wird erreicht, daß eine Stützung der Profilrohre von innen im gesamten Bereich des Durchtritts durch den Hohlraum erreicht wird.In a preferred embodiment, the pins protrude into the cutouts of the half rings. This ensures that the profile tubes are supported from the inside in the entire area of the passage through the cavity.

In einer weiteren Ausführungsform sind 2 Innenschalen vorgesehen, wobei die Aussparungen der radial inneren Innenschale eine Form und Größe aufweisen, daß die Zapfen, nicht jedoch die Profilrohre, hindurchpassen. Hierdurch läßt sich eine einfache Öffnung der Vorrichtung unterstützen und die Profilrohre ragen etwas über den Wandabschnitt hinaus, so daß zusätzliche Lötverbindungen zwischen Profilrohr und Wandabschnitt vorgenommen werden können.In a further embodiment, two inner shells are provided, the recesses of the radially inner inner shell having a shape and size such that the pins but not the profile tubes fit through. In this way, a simple opening of the device can be supported and the profile tubes protrude somewhat beyond the wall section, so that additional soldered connections can be made between the profile tube and the wall section.

Vorzugsweise wird der Hohlraum durch ein Spritzverfahren mit sinterfähigem Pulver gefüllt, wobei dieses mit Kunststoff ummanteltes Metallpulver ist. Hierdurch wird eine schnelle Füllung und gute Verdichtung des Hohlraumes erreicht.The cavity is preferably filled with a sinterable powder by a spraying process, this powder being metal powder coated with plastic. This ensures rapid filling and good compression of the cavity.

Weitere bevorzugte Ausführungsformen sind den weiteren Unteransprüchen zu entnehmen.Further preferred embodiments can be found in the further subclaims.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnungen weiter beschrieben. Dabei zeigt:

  • Fig. 1 eine Ansicht eines Wärmetauscherblocks,
  • Fig. 2 eine teilgeschnittene Ansicht der erfindungsgemäßen Vorrichtung,
  • Fig. 3 eine perspektivische Ansicht einer Anzahl Halbringe,
  • Fig. 4 eine perspektivische Ansicht zweier konzentrischer Innenschalen,
  • Fig. 5 eine perspektivische Ansicht des Halbzylinders,
  • Fig. 6 eine geschnittene Detailansicht eines Aussichnittes aus Fig. 2.
The invention is described below using an exemplary embodiment with reference to the drawings. It shows:
  • 1 is a view of a heat exchanger block,
  • 2 is a partially sectioned view of the device according to the invention,
  • 3 is a perspective view of a number of half rings,
  • 4 is a perspective view of two concentric inner shells,
  • 5 is a perspective view of the half cylinder,
  • FIG. 6 shows a sectional detailed view of a view section from FIG. 2.

Ein in Fig. 1 gezeigter Wärmetauscherblock 1 besteht im wesentlichen aus einem Eintrittssammelrohr 2 und einem achsparallelen Austrittssammelrohr 3, die durch eine Vielzahl U-förmig gekrümmter Profilrohre miteinander verbunden sind. Im Betrieb strömt eine Fluid vom Eintrittssammelrohr 2 durch die Profilrohre 4 bis zum Austrittssammelrohr 3. Gleichzeitig wird ein Gasstrom 15 senkrecht zu den Profilrohren 4 geleitet (Kreuz/Gegenstrom), wobei ein Wärmeaustausch zwischen den beiden Fluiden über die Wände der Profilrohre 4 stattfindet. Die Profilrohre 4 können dabei runde, ellipsenartige, oder sonstige stromlinienförmige Querschnitte aufweisen. Im Abstand von den Sammelrohren 2 und 3 werden die Profilrohre 4 von Abstandshaltern 16 positioniert.A heat exchanger block 1 shown in Fig. 1 consists essentially of an inlet header 2 and an axially parallel outlet header 3, which are connected to each other by a plurality of U-shaped curved profile tubes. In operation, a fluid flows from the inlet header 2 through the profile tubes 4 to the outlet header 3. At the same time, a gas flow 15 is directed perpendicular to the profile tubes 4 (cross / counterflow), with heat exchange between the two fluids taking place via the walls of the profile tubes 4. The profile tubes 4 can have round, elliptical or other streamlined cross sections. At a distance from the header tubes 2 and 3, the profile tubes 4 are positioned by spacers 16.

Fig. 2 zeigt die erfindungsgemäße Vorrichtung, bei der eine Anzahl Halbringe 5 nebeneinander auf ein Fundament 14 angeordnet sind. Dabei sind die Halbringe 5 durch Spannvorrichtungen 8a und 8b gegeneinander verspannt und über Verspannvorrichtungen 7a und 7b auf den Fundament 14 festgelegt. Radial innerhalb der Halbringe 5 sind durch einen hülsenteilartigen Hohlraum 9 beabstandet, zwei konzentrische Innenschalen 10a und 10b angeordnet. Radial innerhalb der Innenschale 10b ist wiederum ein Halbzylinder 12 vorgesehen, welcher nicht am Fundament 14 festgelegt ist, sondern nach unten wegziehbar bleibt.Fig. 2 shows the device according to the invention, in which a number of half rings 5 are arranged side by side on a foundation 14. The half rings 5 are braced against one another by tensioning devices 8a and 8b and fixed on the foundation 14 via tensioning devices 7a and 7b. Radially inside the half rings 5 are spaced apart by a sleeve-like cavity 9, two concentric inner shells 10a and 10b are arranged. A half-cylinder 12 is again provided radially inside the inner shell 10b, which is not fixed to the foundation 14, but remains pullable downward.

Die Halbringe 5 sind - wie in Fig. 3 zu erkennen - mit einer Anzahl Aussparungen 6 versehen, die jeweils an den Trennfugen zweier benachbarter Halbringe 5 vorgesehen sind. Die Aussparungen 6 haben dabei eine Form, die exakt der äußeren Kontur der Profilrohre 4 entspricht, so daß die Profilrohre 4 durch die Aussparungen 6 hindurchgesteckt werden können.The half rings 5 are - as can be seen in Fig. 3 - provided with a number of recesses 6, which are each provided on the parting lines of two adjacent half rings 5. The recesses 6 have a shape that corresponds exactly to the outer contour of the profile tubes 4, so that the profile tubes 4 can be inserted through the recesses 6.

Axialfluchtend mit den Aussparungen 6 der Halbringe 5 sind in den Halbschalen 10a und 10b ebenfalls Aussparungen 11 a und 11 b vorgesehen. Dabei weisen die in der radial äußeren Halbschale 10a befindlichen Aussparungen 11 a die gleiche Form und Größe auf, wie die Aussparungen 6, so daß die Profilrohre 4 auch hier durchzustecken sind. Demgegenüber haben die Aussparungen 11b die Form der Innenkontur der Profilrohre 4, so daß die Innenschale 10b als Anschlag für die durchgesteckten Profilrohre 4 dient.Axially aligned with the cutouts 6 of the half rings 5, cutouts 11a and 11b are likewise provided in the half shells 10a and 10b. The recesses 11a located in the radially outer half-shell 10a have the same shape and size on how the recesses 6, so that the profile tubes 4 are to be pushed through here. In contrast, the recesses 11b have the shape of the inner contour of the profile tubes 4, so that the inner shell 10b serves as a stop for the inserted profile tubes 4.

Am Halbzylinder 12 sind Zapfen 13 angebracht, die ebenfalls die Form der Innenkontur der Profilrohre 4 aufweisen. Diese Zapfen 13 sind durch die Aussparungen 11 a und 11 b hindurchgesteckt und ragen bis in die Aussparungen 6 der Halbringe 5 hinein. Ein in der Fig. 2 gezeigtes Profilrohr 4 ist durch die Aussparung 6 und 11 hindurchgesteckt, wobei es gleichzeitig in seinem Endabschnitt einen Zapfen 13 umschließt und an der Innenschale 10b abgestützt ist.On the half cylinder 12 pins 13 are attached, which also have the shape of the inner contour of the profile tubes 4. These pins 13 are inserted through the recesses 11 a and 11 b and protrude into the recesses 6 of the half rings 5. A profile tube 4 shown in FIG. 2 is inserted through the cutouts 6 and 11, at the same time enclosing a pin 13 in its end section and being supported on the inner shell 10b.

Fig. 4 zeigt die zwei konzentrischen Innenschalen 10a und 10b perspektivisch, wobei beide mit einer Anzahl regelmäßig verteilter, koaxialer Bohrungen 11 a und 11 b versehen sind.Fig. 4 shows the two concentric inner shells 10a and 10b in perspective, both of which are provided with a number of regularly distributed, coaxial bores 11a and 11b.

Fig. 5 zeigt perspektivisch den Halbzylinder 12 mit den befestigten Zapfen 13, wobei diese der Innenkontur der Profilrohre 4 angepaßt sind.Fig. 5 shows in perspective the half cylinder 12 with the attached pin 13, which are adapted to the inner contour of the profile tubes 4.

In Fig. 6 ist ein Axialschnitt durch einen Zapfen 13 gezeigt. Dabei sind ober- und unterhalb der Mittellinie 17 verschiedene Ausführungsformen zu sehen. Oberhalb der Mittellinie 17 ist eine Ausführung mit nur einer Innenschale 10b zu sehen, wobei die Profilrohre 4 mit der Innenfläche des in der Hohlform 9 gebildeten Wandabschnittes abschließen. Die Zapfen 13 sind mittels Schweißverbindungen 18 mit dem Halbzylinder 12 verbunden. In anderen Ausführungsformen sind andere Verbindungsarten wie Löten, Schrauben, Kleben oder Sintern denkbar.6 shows an axial section through a pin 13. 17 different embodiments can be seen above and below the center line. An embodiment with only one inner shell 10b can be seen above the center line 17, the profile tubes 4 terminating with the inner surface of the wall section formed in the hollow mold 9. The pins 13 are connected to the half cylinder 12 by means of welded connections 18. In other embodiments, other types of connection such as soldering, screwing, gluing or sintering are conceivable.

In der Ausführungsform unterhalb der Mittellinie 17 sind zwei Innenschalen 10a und 10b vorgesehen, wobei die Profilrohre 4 nur durch die radial äußere Innenschale 10a hindurchragen und sich auf der zweiten Innenschale 10b abstützen.In the embodiment below the center line 17, two inner shells 10a and 10b are provided, the profile tubes 4 only projecting through the radially outer inner shell 10a and being supported on the second inner shell 10b.

Beim Herstellungsverfahren wird ein mit Kunststoff ummanteltes Metallpulver über nicht dargestellte Zuführungsöffnungen unter hohem Druck in den Hohlraum 9 eingespritzt. Nachdem eine gewisse Verfestigung stattgefunden hat, wird der Halbzylinder 12 mit den befestigten Zapfen 13 nach unten weggezogen. Gleichzeitig werden die Spannvorrichtungen 7a, 7b und 8a, 8b gelöst. Jetzt läßt sich jeder einzelne Halbring zunächst nach oben wegziehen und anschließend unter elastischer Verformung der Profilrohre 4 ganz entfernen. Bei dem anschließenden Sintervorgang tritt eine gasdichte Verbindung zwischen den Profilrohren 4 und dem gebildeten Wandabschnitt ein.In the manufacturing process, a metal powder encased in plastic is injected into the cavity 9 under high pressure via feed openings (not shown). After a certain solidification has taken place, the half cylinder 12 with the attached pins 13 is pulled downwards. At the same time, the clamping devices 7a, 7b and 8a, 8b are released. Now each individual half ring can first be pulled upwards and then completely removed with elastic deformation of the profile tubes 4. In the subsequent sintering process, a gas-tight connection occurs between the profile tubes 4 and the wall section formed.

Die auf diese Weise hergestellten Wandabschnitte mit befestigten Profilrohren werden zusammengefügt, wodurch die Sammelrohre 2 und 3 gebildet werden. Die Verbindung kann dabei mittels sintern, löten oder schweißen erfolgen.The wall sections produced in this way with attached profile tubes are assembled, whereby the header tubes 2 and 3 are formed. The connection can be made by sintering, soldering or welding.

Zweckmäßigerweise haben die Wandabschnitte etwa 1/4 der Länge der Sammelrohre 2 bzw. 3, so daß 8 Bauteile zusammen einen Wärmetauscherblock 1 bilden.The wall sections expediently have about 1/4 the length of the header pipes 2 or 3, so that 8 components together form a heat exchanger block 1.

Es sei betont, daß sich die Erfindung nicht nur auf die gezeigte Ausführungsform beschränkt, sondern für jede denkbare Sammelrohrform analog anzuwenden ist, ohne daß der Grundgedanke der Erfindung verlassen wird. So könnten beispielsweise bei etwa rechteckigem Sammelrohrquerschnitt die Innenschalen 10a, 10b die Halbringe 5 und der Halbzylinder 12 in ihrem Mittelabschnitt ebene Form aufweisen.It should be emphasized that the invention is not limited to the embodiment shown, but can be used analogously for every conceivable manifold shape, without departing from the basic idea of the invention. For example, with an approximately rectangular collector tube cross section, the inner shells 10a, 10b, the half rings 5 and the half cylinder 12 could have a flat shape in their central section.

Claims (9)

1. Device for the production by powder metallurgy of a collecting tube section of a heat exchanger block and for connecting it to a plurality of profiled tubes fixedly attached thereto, characterised in that:
a) a number of half rings (5) are arranged next to each other on the front and have recesses (6) on their contact surfaces which are adapted to the outer contour of the profiled tubes (4),
b) the half rings (5) are clamped together by clamping devices (8) to form a half shell,
c) one or more semi-cylindrical inner shells (10a, 10b) are provided concentrically inside the half shell with clearance and have recesses (11 a, 11 b) which are themselves in alignment with the recesses (6) in the half rings (5),
d) the cavity (9) formed between the half shell and the inner shell (10a) has the negative shape of a wall section of the collecting tube (2), the cavity (9) being fillable with sinterable powder by means of one or several filling apertures,
e) radially inside the inner shell(s) (10a, 10b) there is provided a half-cylinder (12) on which pins (13) are fitted which have the shape of the inner contour of the profiled tubes (4).
2. Device according to claim 1, characterised in that the pins (13) project into the recesses (6) of the half rings (5)..
3. Device according to claim 1 and 2, characterised in that two inner shells (10a, 10b) are provided, the recesses (11 b) of the radially inner shell (1 Ob) having a size such that the pins (13) can pass through but not the profiled tubes (4).
4. Device according to claim 1 to 3, characterised in that the half cylinder (12) can be removed radially inwardly.
5. Process for the production of a heat exchanger block having at least one collecting tube and a plurality of profiled tubes fixedly connected thereto with the aid of a device according to one or more of claims 1 to 4, characterised in that the cavity (9) is filled with sinterable powder by injecting.
6. Process according to claim 5, characterised in that the sinterable powder is metal powder coated with plastics.
7. Process according to claims 5 and 6, characterised in that after the injection process the half cylinder (12) and the half rings (5) are removed and the injected moulded part is hardened by means of sintering and connected in gas-tight manner to the profiled tubes (4).
8. Process according to claim 5 to 7, characterised in that the sintered moulded parts forming a wall section of the collecting tube (2) are joined together to form a heat exchanger block.
9. Process according to claim 8, characterised in that the joining-together is effected by sintering, soldering or welding.
EP88110264A 1987-07-07 1988-06-28 Device for the production of a collecting tube section by powder metallurgy Expired - Lifetime EP0298340B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3722329 1987-07-07
DE3722329A DE3722329C1 (en) 1987-07-07 1987-07-07 Device and method for powder metallurgical production of a header section of a heat exchanger block

Publications (2)

Publication Number Publication Date
EP0298340A1 EP0298340A1 (en) 1989-01-11
EP0298340B1 true EP0298340B1 (en) 1990-12-12

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EP88110264A Expired - Lifetime EP0298340B1 (en) 1987-07-07 1988-06-28 Device for the production of a collecting tube section by powder metallurgy

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US (1) US4867412A (en)
EP (1) EP0298340B1 (en)
JP (1) JPS6417807A (en)
DE (1) DE3722329C1 (en)

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CA2179947A1 (en) * 1995-09-25 1997-03-26 Michael Gunnar Johnson Mold assembly for forming apertures in a molded body
US6587742B2 (en) * 2000-12-20 2003-07-01 Mark Manuel Method and apparatus for the creation of a tool
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US20040038074A1 (en) 2001-11-01 2004-02-26 Mark Manuel Tool and a method for creating a tool
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US7195223B2 (en) * 2002-12-02 2007-03-27 Mark Manuel System and a method for cooling a tool
US20050196232A1 (en) * 2004-03-05 2005-09-08 Mark Manuel Method and an apparatus for the creation of a tangible item, such as a tool and/or a part, and a tangible item
US20060156787A1 (en) * 2005-01-18 2006-07-20 Mark Manuel Laminated tool and a method for forming a tool
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Also Published As

Publication number Publication date
US4867412A (en) 1989-09-19
EP0298340A1 (en) 1989-01-11
JPS6417807A (en) 1989-01-20
DE3722329C1 (en) 1988-11-24

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