EP0851200B2 - Process for arranging tabs and/or projections on a thin sheet, thin sheet with tabs and/or projections and thin tube of rectangular cross section - Google Patents

Process for arranging tabs and/or projections on a thin sheet, thin sheet with tabs and/or projections and thin tube of rectangular cross section Download PDF

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Publication number
EP0851200B2
EP0851200B2 EP97120668A EP97120668A EP0851200B2 EP 0851200 B2 EP0851200 B2 EP 0851200B2 EP 97120668 A EP97120668 A EP 97120668A EP 97120668 A EP97120668 A EP 97120668A EP 0851200 B2 EP0851200 B2 EP 0851200B2
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EP
European Patent Office
Prior art keywords
tabs
projections
thin
thin sheet
sheet metal
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
EP97120668A
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German (de)
French (fr)
Other versions
EP0851200B1 (en
EP0851200A2 (en
EP0851200A3 (en
Inventor
Claus Beck
Jürgen Dipl.-Ing. Hägele (FH)
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Mahle Behr GmbH and Co KG
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Behr GmbH and Co KG
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Publication date
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Application filed by Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/04—Tubular elements of cross-section which is non-circular polygonal, e.g. rectangular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • 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
    • B21D53/04—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of sheet metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S138/00—Pipes and tubular conduits
    • Y10S138/04—Air conditioning
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S138/00—Pipes and tubular conduits
    • Y10S138/11—Shape

Definitions

  • the invention relates to a rectangular tube made of two thin sheets for a heat exchanger, as shown in EP 0677715 A1 known.
  • the invention has for its object to provide a rectangular tube of the type mentioned, which is economically feasible.
  • FIG. 1 and 2 illustrated rectangular tube 10, which is drawn approximately in four times its normal size, is intended for use in a heat exchanger and in particular an exhaust gas heat exchanger. From a plurality of such rectangular tubes 10, a tube bundle is formed, which is intended for the management of exhaust gas. The ends of the tube bundles are arranged gas-tight in each case in a tubesheet, wherein the tubesheets together with an outer jacket surrounding the tube bundle form a housing for guiding a liquid coolant. This housing is provided between the two tubesheets with an inlet and an outlet for the liquid coolant.
  • Such an exhaust gas heat exchanger is not previously published German Patent Application P 195 40 683.4 disclosed.
  • the rectangular tube 10 is composed of two U-shaped thin sheet metal shells 11, 12, which are connected at their webs sealed together, in particular welded. From the bottoms of the two sheet metal shells 11, 12 protrude toward the interior of the rectangular tube 10 tabs 13, 14, which extend over about a quarter to a third of the height of the rectangular tube.
  • the tabs 13, 14 are each arranged in pairs symmetrically to the longitudinal center of the rectangular tube 10. They run apart in the direction of flow of the gas to be guided in a V-shaped manner, their ends facing the direction of flow maintaining a distance from one another.
  • the paired tabs 13, 14 are repeated over the length of the rectangular tube 10 at regular intervals.
  • the thin sheet metal shells 11, 12 are arranged offset from one another in such a way that the tabs 13, 14 of the bottoms of the sheet metal shell 11 and the thin sheet metal shell 12 are arranged offset from one another in the longitudinal direction.
  • the tabs 13, 14 are formed from the bottoms of the sheet metal shells 11, 12 by means of massive forming and in particular by means of extrusion molding.
  • the strips of sheet metal, the later are deformed to the thin sheet half-shells 11, 12, between a die and a stamp areally loaded with pressure such that the yield point of the sheet material is exceeded and a portion of the sheet material in slots of a die (or the punch) flows in, the shape of the tabs 13, 14 determine.
  • the sheet-metal strips are loaded by means of a circular surface which surrounds the two tabs 13, 14.
  • other loading surfaces can be provided, for example, square or rectangular surfaces or surfaces which are adapted to the contour of the tabs 13, 14 to be formed.
  • the thin strips of sheet metal which have a sheet thickness of not more than 1.0 mm, are compressed by extrusion to about 70% to about 50% of their original sheet thickness, whereby tabs 13, 14 result in a height whose height is readily 1, 5 times the original sheet thickness.
  • Fig. 3 schematically a device is shown, by means of which the massive forming can be carried out to form the tabs according to the invention.
  • the device has a lower part 15, in which a die 16 is arranged.
  • the die 16 has a recess 17 into which a thin sheet metal strip 18 is inserted.
  • the sheet-metal strip 18 is held by means attached to the lower part 15 guides 19 in the recess 17.
  • slot-shaped recesses 20 are provided, which serve as negative molds for the tabs to be formed 13, 14.
  • a stamp 22 is held, which is deliverable between the guides 19 to the sheet-metal strip 18, wherein it covers the area of the recesses 20 areally.
  • the punch 22 has a flat stamp surface 23 which is parallel to the thin sheet 18 and covers the area of the recesses 20 of the die 16 in a sufficiently large area.
  • the punch 22 is pressed with its punch surface 23 with sufficient force in the sheet-metal strip 18, so that the yield point of the sheet material is exceeded. A portion of the sheet material then flows into the recesses 20 and forms the tabs 13, 14, in Fig. 1 and 2 are shown.
  • the thin sheet is compressed in the region of the stamp surface 23 to about 70% to about 50% of the original sheet thickness.
  • the indentation depth depends on the height of the tabs to be formed. Conveniently, the penetration depth of the punch surface 23 of the punch 22 is limited by a depth stop.
  • the recesses 20 may be open slots or have a depth that is greater than the desired height of the tabs. The height of the tabs is determined by the indentation depth with which the stamp surface 23 is pressed into the thin sheet 18. It should also be mentioned that during extrusion, the usual for extrusion presses lubricants are used to improve the cutting time of the tool.
  • the extrusion can be carried out in a cold state. If the extrusion is performed in a semi-warm state, for example, up to 600 ° C or in the warm state, for example, up to 1200 ° C, so the flowability of the sheet material increases, so that smaller forming forces are required.
  • a material for the thin sheet strips for example, a steel with the number 1.4539 has proved to be applicable.
  • the apparatus shown can be on the sheet metal strip 18, the pairs of tabs 13, 14 formed cyclically by the sheet 18 advanced cyclically and the extrusion process by supplying the punch 22 is also performed in cycles. However, it is also possible to perform a similar extrusion by rolling the fine sheet strip. It can also be provided that a central strip, in which the tabs 13, 14 are formed by massive forming, constantly extruded and compressed, while still the tabs are formed only at regular intervals.
  • a die 16 is provided with a flat bearing surface, while the recesses 20 corresponding recesses in the punch 22 in the region of the die face 23 are provided.
  • the attachment of the recesses 20 in the die 16 has the advantage that the gas-carrying side of a tube formed from the sheet metal strip 18 except for the tabs 13, 14 smooth inner walls, so that a deposit of solid particles or the like. is avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Automatic Assembly (AREA)
  • Exhaust Silencers (AREA)

Description

Die Erfindung betrifft ein aus zwei Feinblechen hergestelltes Rechteckrohr für einen Wärmeübertrager, wie aus der EP 0677715 A1 bekannt.The invention relates to a rectangular tube made of two thin sheets for a heat exchanger, as shown in EP 0677715 A1 known.

In der nicht vorveröffentlichten DE-Patentanmeldung P 195 40 683.4 (& EP-A-0 772 018 , Stand der Tecknik gemäß Art. 54(3) EPC) ist offenbart, daß an Feinblechen paarweise Laschen angebracht werden, die in Strömungsrichtung V-förmig auseinanderlaufen. Diese Laschen erstrecken sich bis etwa zu einem Viertel oder einem Drittel der Höhe des Rechteckrohres, so daß sie eine Höhe haben, die deutlich höher als die Blechstärke ist. In der DE-Patentanmeldüng ist offenbart, daß diese Laschen insbesondere als Einsätze vorgesehen werden, die beim Zusammenfügen der Rechteckrohre oder auch vorher an den Feinblechen angebracht werden, z.B. mittels Tiefziehens und Zusammendrückens.In the not pre-published DE patent application P 195 40 683.4 (& EP-A-0 772 018 , Tecknik state according to Art. 54 (3) EPC) is disclosed that pairs of tabs are attached to thin sheets, which diverge in the flow direction V-shaped. These tabs extend to about a quarter or one third of the height of the rectangular tube, so that they have a height that is significantly higher than the plate thickness. In DE Patentanmeldüng it is disclosed that these tabs are provided in particular as inserts, which are attached to the assembly of the rectangular tubes or even before the thin sheets, for example by means of deep drawing and compression.

Der Erfindung liegt die Aufgabe zugrunde, ein Rechteckrohr der eingangs genannten Art zu schaffen, das wirtschaftlich zu verwirklichen ist.The invention has for its object to provide a rectangular tube of the type mentioned, which is economically feasible.

Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a method having the features of claim 1.

Weitere Vorteile der Erfindung ergeben sich aus der beigefügten Beschreibung einer Vorrichtung zum Massivumformen von Feinblechen, die nicht unter den Schutzbereich der Ansprüche fällt. Anspruch 2 betrifft einen Wärmeübertrager mit mindestens einem Rechteckrohr gemäß Anspruch 1.

Fig. 1
zeigt eine Stirnansicht eines Rechteckrohres für einen Abgaswärmeübertrager, das mit mittels Massivumformen aus dem Boden der Feinblechschalen herausgeformten Laschen versehen ist,
Fig. 2
eine Ansicht auf eine Blechschale im Bereich zweier Laschen und
Fig. 3
eine Vorrichtung zum Durchführen des erfindungsgemäßen Verfahrens.
Further advantages of the invention will become apparent from the accompanying description of a device for the massive forming of thin sheets, which does not fall under the scope of the claims. Claim 2 relates to a heat exchanger with at least one rectangular tube according to claim 1.
Fig. 1
shows an end view of a rectangular tube for an exhaust gas heat exchanger, which is provided with formed by means of massive forming of the bottom of the sheet metal shells tabs,
Fig. 2
a view of a sheet metal shell in the region of two tabs and
Fig. 3
a device for carrying out the method according to the invention.

Das in Fig. 1 und 2 dargestellte Rechteckrohr 10, das etwa in dem Vierfachen seiner normalen Größe gezeichnet ist, ist zur Verwendung in einem Wärmeübertrager und insbesondere einem Abgaswärmeübertrager bestimmt. Aus einer Vielzahl derartiger Rechteckrohre 10 wird ein Rohrbündel gebildet, das zur Führung von Abgas bestimmt ist. Die Enden der Rohrbündel sind gasdicht jeweils in einem Rohrboden angeordnet, wobei die Rohrböden zusammen mit einem das Rohrbündel umgebenden Außenmantel ein Gehäuse zur Führung eines flüssigen Kühlmittels bilden. Dieses Gehäuse ist zwischen den beiden Rohrböden mit einem Eintritt und einem Austritt für das flüssige Kühlmittel versehen. Ein derartiger Abgaswärmetauscher ist in der nicht vorveröffentlichten deutschen Patentanmeldung P 195 40 683.4 offenbart.This in Fig. 1 and 2 illustrated rectangular tube 10, which is drawn approximately in four times its normal size, is intended for use in a heat exchanger and in particular an exhaust gas heat exchanger. From a plurality of such rectangular tubes 10, a tube bundle is formed, which is intended for the management of exhaust gas. The ends of the tube bundles are arranged gas-tight in each case in a tubesheet, wherein the tubesheets together with an outer jacket surrounding the tube bundle form a housing for guiding a liquid coolant. This housing is provided between the two tubesheets with an inlet and an outlet for the liquid coolant. Such an exhaust gas heat exchanger is not previously published German Patent Application P 195 40 683.4 disclosed.

Das Rechteckrohr 10 ist aus zwei U-förmigen Feinblechschalen 11, 12 zusammengesetzt, die an ihren Stegen dicht miteinander verbunden sind, insbesondere verschweißt sind. Von den Böden der beiden Feinblechschalen 11, 12 ragen zum Innern des Rechteckrohres 10 hin Laschen 13, 14 ab, die sich etwa über ein Viertel bis ein Drittel der Höhe des Rechteckrohres erstrecken. Die Laschen 13, 14 sind jeweils paarweise symmetrisch zur Längsmitte des Rechteckrohres 10 angeordnet. Sie laufen in Strömungsrichtung des zu führenden Gases V-förmig auseinander, wobei ihre der Strömungsrichtung zugewandten Enden einen Abstand zueinander einhalten. Die paarweise angeordneten Laschen 13, 14 wiederholen sich über die Länge des Rechteckrohres 10 in regelmäßigen Abständen. Dabei sind die Feinblechschalen 11, 12 derart versetzt zueinander angeordnert, daß die Laschen 13, 14 der Böden der Feinblechschale 11 und der Feinblechschale 12 in Längsrichtung versetzt zueinander angeordnet sind.The rectangular tube 10 is composed of two U-shaped thin sheet metal shells 11, 12, which are connected at their webs sealed together, in particular welded. From the bottoms of the two sheet metal shells 11, 12 protrude toward the interior of the rectangular tube 10 tabs 13, 14, which extend over about a quarter to a third of the height of the rectangular tube. The tabs 13, 14 are each arranged in pairs symmetrically to the longitudinal center of the rectangular tube 10. They run apart in the direction of flow of the gas to be guided in a V-shaped manner, their ends facing the direction of flow maintaining a distance from one another. The paired tabs 13, 14 are repeated over the length of the rectangular tube 10 at regular intervals. The thin sheet metal shells 11, 12 are arranged offset from one another in such a way that the tabs 13, 14 of the bottoms of the sheet metal shell 11 and the thin sheet metal shell 12 are arranged offset from one another in the longitudinal direction.

Die Laschen 13, 14 sind aus den Böden der Feinblechschalen 11, 12 mittels Massivumformens und insbesondere mittels eines Fließpressens herausgeformt. Hierzu werden die Feinblechstreifen, die später zu den Feinblechhalbschalen 11, 12 umgeformt werden, zwischen einer Matrize und einem Stempel flächig mit Druck derart belastet, daß die Fließgrenze des Blechmaterials überschritten wird und ein Teil des Feinblechmaterials in Schlitze einer Matrize (oder auch des Stempels) hineinfließt, die die Form der Laschen 13, 14 bestimmen. Bei dem in Fig. 1 und 2 dargestellten Ausführungsbeispiel werden die Feinblechstreifen mittels einer Kreisfläche belastet, die die beiden Laschen 13, 14 umgibt. Es können jedoch noch andere Belastungsflächen vorgesehen werden, beispielsweise quadratische oder rechteckige Flächen oder Flächen, die an die Kontur der zu bildenden Laschen 13, 14 angepaßt sind. Die Feinblechstreifen, die eine Blechstärke von nicht mehr als 1,0 mm aufweisen, werden mittels Fließpressen auf etwa 70% bis etwa 50% ihrer ursprünglichen Blechstärke zusammengedrückt, wodurch sich Laschen 13, 14 von einer Höhe ergeben, deren Höhe ohne weiteres das 1,5-fache der ursprünglichen Blechstärke betragen kann.The tabs 13, 14 are formed from the bottoms of the sheet metal shells 11, 12 by means of massive forming and in particular by means of extrusion molding. For this purpose, the strips of sheet metal, the later are deformed to the thin sheet half-shells 11, 12, between a die and a stamp areally loaded with pressure such that the yield point of the sheet material is exceeded and a portion of the sheet material in slots of a die (or the punch) flows in, the shape of the tabs 13, 14 determine. At the in Fig. 1 and 2 illustrated embodiment, the sheet-metal strips are loaded by means of a circular surface which surrounds the two tabs 13, 14. However, other loading surfaces can be provided, for example, square or rectangular surfaces or surfaces which are adapted to the contour of the tabs 13, 14 to be formed. The thin strips of sheet metal, which have a sheet thickness of not more than 1.0 mm, are compressed by extrusion to about 70% to about 50% of their original sheet thickness, whereby tabs 13, 14 result in a height whose height is readily 1, 5 times the original sheet thickness.

In Fig. 3 ist schematisch eine Vorrichtung dargestellt, mittels der das Massivumformen zum Bilden der Laschen gemäß der Erfindung durchgeführt werden kann. Die Vorrichtung besitzt ein Unterteil 15, in der eine Matrize 16 angeordnet ist. Die Matrize 16 besitzt eine Aussparung 17, in die ein Feinblechstreifen 18 eingeschoben ist. Der Feinblechstreifen 18 ist mittels an dem Unterteil 15 angebrachter Führungen 19 in der Aussparung 17 gehalten. In der Matrize 16 sind schlitzförmige Aussparungen 20 vorgesehen, die als Negativformen für die zu bildenden Laschen 13, 14 dienen.In Fig. 3 schematically a device is shown, by means of which the massive forming can be carried out to form the tabs according to the invention. The device has a lower part 15, in which a die 16 is arranged. The die 16 has a recess 17 into which a thin sheet metal strip 18 is inserted. The sheet-metal strip 18 is held by means attached to the lower part 15 guides 19 in the recess 17. In the die 16 slot-shaped recesses 20 are provided, which serve as negative molds for the tabs to be formed 13, 14.

In einem dem Unterteil 15 unter Aufbringung einer Preßkraft zustellbaren Oberteil 21, ist ein Stempel 22 gehalten, der zwischen den Führungen 19 dem Feinblechstreifen 18 zustellbar ist, wobei er den Bereich der Aussparungen 20 flächig überdeckt. Der Stempel 22 besitzt hierzu eine ebene, zu dem Feinblech 18 parallele Stempelfläche 23, die den Bereich der Aussparungen 20 der Matrize 16 in ausreichender Größe flächig überdeckt. Der Stempel 22 wird mit seiner Stempelfläche 23 mit ausreichender Kraft in den Feinblechstreifen 18 eingedrückt, so daß die Fließgrenze des Blechmaterials überschritten wird. Ein Teil des Blechmaterials fließt dann in die Aussparungen 20 und bildet dabei die Laschen 13, 14, die in Fig. 1 und 2 dargestellt sind. Dabei wird das Feinblech in dem Bereich der Stempelfläche 23 auf etwa 70% bis etwa 50% der ursprünglichen Blechstärke zusammengedrückt. Die Eindrücktiefe hängt von der Höhe der zu bildenden Laschen ab. Zweckmäßigerweise wird die Eindringtiefe der Stempelfläche 23 des Stempels 22 durch einen Tiefenanschlag begrenzt. Die Aussparungen 20 können offene Schlitze sein oder eine Tiefe aufweisen, die größer als die gewünschte Höhe der Laschen ist. Die Höhe der Laschen bestimmt sich durch die Eindrücktiefe, mit der die Stempelfläche 23 in das Feinblech 18 eingedrückt wird. Zu erwähnen ist noch, daß bei dem Fließpressen die für Fließpressen üblichen Schmiermittel eingesetzt werden, um die Stanzzeit des Werkzeugs zu verbessern.In a lower part 15 under application of a compressive force deliverable upper part 21, a stamp 22 is held, which is deliverable between the guides 19 to the sheet-metal strip 18, wherein it covers the area of the recesses 20 areally. For this purpose, the punch 22 has a flat stamp surface 23 which is parallel to the thin sheet 18 and covers the area of the recesses 20 of the die 16 in a sufficiently large area. The punch 22 is pressed with its punch surface 23 with sufficient force in the sheet-metal strip 18, so that the yield point of the sheet material is exceeded. A portion of the sheet material then flows into the recesses 20 and forms the tabs 13, 14, in Fig. 1 and 2 are shown. In this case, the thin sheet is compressed in the region of the stamp surface 23 to about 70% to about 50% of the original sheet thickness. The indentation depth depends on the height of the tabs to be formed. Conveniently, the penetration depth of the punch surface 23 of the punch 22 is limited by a depth stop. The recesses 20 may be open slots or have a depth that is greater than the desired height of the tabs. The height of the tabs is determined by the indentation depth with which the stamp surface 23 is pressed into the thin sheet 18. It should also be mentioned that during extrusion, the usual for extrusion presses lubricants are used to improve the cutting time of the tool.

Das Fließpressen kann in kaltem Zustand durchgeführt werden. Wenn das Fließpressen in halbwarmem Zustand, beispielsweise bis 600°C oder im warmen Zustand, beispielsweise bis 1200°C, durchgeführt wird, so erhöht sich die Fließfähigkeit des Blechmaterials, so daß kleinere Umformkräfte erforderlich sind. Als Werkstoff für den Feinblechstreifen hat sich beispielsweise ein Stahl mit der Nr. 1.4539 als anwendbar erwiesen.The extrusion can be carried out in a cold state. If the extrusion is performed in a semi-warm state, for example, up to 600 ° C or in the warm state, for example, up to 1200 ° C, so the flowability of the sheet material increases, so that smaller forming forces are required. As a material for the thin sheet strips, for example, a steel with the number 1.4539 has proved to be applicable.

Mit der in Fig. 3 dargestellten Vorrichtung lassen sich an den Blechstreifen 18 die Paare von Laschen 13, 14 taktweise formen, indem das Feinblech 18 taktweise vorgeschoben und der Fließpreßvorgang durch Zustellen des Stempels 22 ebenfalls taktweise ausgeführt wird. Es ist jedoch auch möglich, ein ähnliches Fließpressen mittels Walzen des Feinblechstreifens durchzuführen. Dabei kann auch vorgesehen werden, daß ein Mittelstreifen, in welchem die Laschen 13, 14 durch Massivumformen gebildet werden, ständig fließgepreßt und damit zusammengedrückt wird, während dennoch die Laschen nur in regelmäßigen Abständen gebildet werden.With the in Fig. 3 The apparatus shown can be on the sheet metal strip 18, the pairs of tabs 13, 14 formed cyclically by the sheet 18 advanced cyclically and the extrusion process by supplying the punch 22 is also performed in cycles. However, it is also possible to perform a similar extrusion by rolling the fine sheet strip. It can also be provided that a central strip, in which the tabs 13, 14 are formed by massive forming, constantly extruded and compressed, while still the tabs are formed only at regular intervals.

Bei einer abgewandelten Ausführungsform wird eine Matrize 16 mit einer ebenen Auflagefläche vorgesehen, während den Aussparungen 20 entsprechende Aussparungen in dem Stempel 22 im Bereich der Stempelfläche 23 vorgesehen sind. Das Anbringen der Aussparungen 20 in der Matrize 16 hat jedoch den Vorteil, daß die gasführende Seite eines aus den Blechstreifen 18 gebildeten Rohres bis auf die Laschen 13, 14 glatte Innenwandungen aufweist, so daß eine Ablagerung von festen Partikeln o.dgl. vermieden wird.In a modified embodiment, a die 16 is provided with a flat bearing surface, while the recesses 20 corresponding recesses in the punch 22 in the region of the die face 23 are provided. However, the attachment of the recesses 20 in the die 16 has the advantage that the gas-carrying side of a tube formed from the sheet metal strip 18 except for the tabs 13, 14 smooth inner walls, so that a deposit of solid particles or the like. is avoided.

Claims (2)

  1. Box-section tubing for a heat transfer device, in particular for an exhaust gas heat transfer device, assembled from two U-shaped sheet metal shells, whereby pairs of solid tabs project inwards from the base of at least one of the sheet metal shells and diverge in a V-shaped formation in the direction of flow, whereby the tabs (13, 14) are shaped from the base of at least one of the sheet metal shells (11, 12) by means of impact extrusion involving the planar loading of the sheet metal.
  2. Heat transfer device, in particular exhaust gas heat transfer device, with a plurality of box-section tubes terminating in tube sheets, characterised in that at least one box-section tube is designed according to claim 1.
EP97120668A 1996-12-24 1997-11-26 Process for arranging tabs and/or projections on a thin sheet, thin sheet with tabs and/or projections and thin tube of rectangular cross section Expired - Lifetime EP0851200B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19654367A DE19654367A1 (en) 1996-12-24 1996-12-24 Method for attaching tabs and / or protrusions to a sheet and sheet with tabs and / or devices and rectangular tube made of sheet
DE19654367 1996-12-24

Publications (4)

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EP0851200A2 EP0851200A2 (en) 1998-07-01
EP0851200A3 EP0851200A3 (en) 1999-05-12
EP0851200B1 EP0851200B1 (en) 2005-01-26
EP0851200B2 true EP0851200B2 (en) 2010-03-17

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EP97120668A Expired - Lifetime EP0851200B2 (en) 1996-12-24 1997-11-26 Process for arranging tabs and/or projections on a thin sheet, thin sheet with tabs and/or projections and thin tube of rectangular cross section

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US (1) US6070616A (en)
EP (1) EP0851200B2 (en)
JP (1) JPH10193017A (en)
DE (2) DE19654367A1 (en)

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Also Published As

Publication number Publication date
JPH10193017A (en) 1998-07-28
EP0851200B1 (en) 2005-01-26
DE19654367A1 (en) 1998-06-25
EP0851200A2 (en) 1998-07-01
EP0851200A3 (en) 1999-05-12
DE59712183D1 (en) 2005-03-03
US6070616A (en) 2000-06-06

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