EP0851200B1 - 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
EP0851200B1
EP0851200B1 EP97120668A EP97120668A EP0851200B1 EP 0851200 B1 EP0851200 B1 EP 0851200B1 EP 97120668 A EP97120668 A EP 97120668A EP 97120668 A EP97120668 A EP 97120668A EP 0851200 B1 EP0851200 B1 EP 0851200B1
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EP
European Patent Office
Prior art keywords
sheet metal
tabs
projections
shaped
sheet
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)
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EP0851200A2 (en
EP0851200A3 (en
EP0851200B2 (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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Publication of EP0851200A3 publication Critical patent/EP0851200A3/en
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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 method for attaching tabs and / or projections on a thin sheet, in particular on a strip of sheet metal, which is substantially perpendicular to protrude from the base of the thin sheet and have a height, which is higher than the sheet thickness (see, for example, WO 95/05571) and one hereinafter produced sheet and a made of two sheets Rectangular tube for a heat exchanger.
  • the invention has for its object to provide a method of to create the type mentioned, the economically too is to realize.
  • the inventive method has the advantage that the tabs and / or protrusions not only simple and schettian a thin sheet or thin sheet strips are attached can, but that the tabs and / or projections massive Parts are those without a column or the like. connect to the sheet. As a result, they do not form susceptible to corrosion Put.
  • the thin sheet in the region of the tabs and / or projections by means Stamp and die loaded flat over its yield point is, wherein a part of the sheet material in one or several recesses of the die and / or stamp pressed is to attach the tabs as negative molds and / or projections correspond. This can be done in a simple manner while maintaining relatively tight tolerances Attach tabs and / or projections to the sheet.
  • a rectangular tube for a Heat exchanger, in particular for an exhaust gas heat exchanger is composed of two U-shaped thin sheet metal shells, with the features of claim 9.
  • the rectangular tube 10 shown in FIGS. 1 and 2, which is approximately in is drawn to four times its normal size is to Use in a heat exchanger and in particular a Exhaust heat exchanger determined.
  • a tube bundle is formed, which leads to the leadership is determined by exhaust.
  • the ends of the tube bundles are each arranged in a gas-tight tube sheet, the Tube sheets together with an outer jacket surrounding the tube bundle a housing for guiding a liquid coolant form.
  • This housing is between the two tube sheets with an inlet and an outlet for the liquid coolant Mistake.
  • Such an exhaust gas heat exchanger is not in the previously published German patent application P 195 40 683.4 disclosed.
  • the rectangular tube 10 is made of two U-shaped thin sheet metal shells 11, 12 composed, which at their webs close together are connected, in particular welded. From the floors the two sheet metal shells 11, 12 protrude to the interior of the Rectangular tube 10 out tabs 13, 14 from, which is about about a quarter to a third of the height of the rectangular tube extend.
  • the tabs 13, 14 are each symmetrical in pairs arranged to the longitudinal center of the rectangular tube 10. she run in the flow direction of the gas to be guided V-shaped apart, with their flow direction facing ends keep a distance to each other.
  • the paired arranged Tabs 13, 14 are repeated over the length of Rectangular tube 10 at regular intervals.
  • the Sheet metal shells 11, 12 offset in such a way to each other, that the tabs 13, 14 of the bottoms of the sheet metal shell 11th and the sheet metal shell 12 offset in the longitudinal direction to each other are arranged.
  • the tabs 13, 14 are from the bottoms of the sheet metal shells 11, 12 by means of massive forming and in particular by means of a Extruded molding.
  • the thin sheet strips, later transformed into thin sheet half shells 11, 12 become flat between a die and a stamp loaded with pressure such that the yield point of Sheet material is exceeded and a part of the sheet material in slots of a die (or stamp) flows in, which determine the shape of the tabs 13, 14.
  • the strips of sheet metal are made by means of a circular surface loaded, which surrounds the two tabs 13, 14. It can, however still other load areas are provided, for example square or rectangular areas or areas, adapted to the contour of the tabs to be formed 13, 14 are.
  • the thin sheet metal strips which have a sheet thickness of not more than 1.0 mm, are by means of extrusion to about 70% to about 50% of their original sheet thickness compressed, causing tabs 13, 14 from a height whose height is easily 1.5 times the original one Can be sheet thickness.
  • a device is shown schematically by means of that performs the massive forming to form the tabs according to the invention can be.
  • the device has a lower part 15, in which a die 16 is arranged.
  • the die 16 has a recess 17, in which a sheet-metal strip 18 is inserted is.
  • the thin sheet strip 18 is by means of the lower part 15 mounted guides 19 held in the recess 17.
  • In the die 16 are slot-shaped recesses 20th provided as negative forms for the tabs to be formed 13, 14 serve.
  • a stamp 22 In a lower part 15 under application of a compressive force undeliverable upper part 21, a stamp 22 is held, the between the guides 19 the sheet-metal strip 18 deliverable is, covering the area of the recesses 20 areally.
  • the punch 22 has a flat, to the thin sheet 18 parallel punch surface 23, which is the area of the recesses 20 of the die 16 in a sufficiently large area covered.
  • the stamp 22 is with its stamp face 23rd pressed into the sheet-metal strip 18 with sufficient force, so that the flow limit of the sheet material exceeded becomes. Part of the sheet material then flows into the recesses 20 and forms the tabs 13, 14, which in Fig. 1 and 2 are shown.
  • the thin sheet is in the area the stamp surface 23 to about 70% to about 50% of the original Sheet thickness compressed.
  • the impression depth depends on the height of the tabs to be formed. Conveniently, is the penetration depth of the punch surface 23 of the punch 22 limited by a depth stop.
  • the recesses 20 may be open slots or have a depth that greater than the desired height of the tabs.
  • the high of Lashing is determined by the indentation depth with which the Stamping surface 23 is pressed into the sheet 18. To mention is still that in the extrusion for extrusion usual lubricants are used to the punching time of the tool.
  • the extrusion can be carried out in a cold state. If the extrusion in a semi-warm state, for example up to 600 ° C or in the warm state, for example up to 1200 ° C, is carried out, it increases the flowability of the Sheet metal, so that smaller forming forces required are.
  • a material for the sheet-metal strips for example a steel with the number 1.4539 proved to be applicable.
  • the pairs of tabs 13, 14 intermittently form by the sheet 18 advanced intermittently and the Extrusion process by feeding the punch 22 also is performed in cycles. It is also possible, however similar extrusion by rolling the fine sheet strip perform. It can also be provided that a Median strip in which the tabs 13, 14 by massive forming be formed, constantly extruded and squeezed with it while still the tabs only in regular Distances are formed.
  • a die 16 provided with a flat bearing surface, while the recesses 20 corresponding recesses in the punch 22 in Area of the punch surface 23 are provided.
  • the recesses 20 in the die 16 has the advantage that the gas-carrying side of a formed from the sheet metal strip 18 Pipe except for the flaps 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 Verfahren zum Anbringen von Laschen und/oder Vorsprüngen an einem Feinblech, insbesondere an einem Feinblechstreifen, die im wesentlichen lotrecht von der Grundfläche des Feinbleches abragen und eine Höhe aufweisen, die höher als die Blechstärke ist (siehe z.B. WO 95/05571), sowie ein hiernach hergestelltes Feinblech und ein aus zwei Feinblechen hergestelltes Rechteckrohr für einen Wärmeübertrager.The invention relates to a method for attaching tabs and / or projections on a thin sheet, in particular on a strip of sheet metal, which is substantially perpendicular to protrude from the base of the thin sheet and have a height, which is higher than the sheet thickness (see, for example, WO 95/05571) and one hereinafter produced sheet and a made of two sheets Rectangular tube for a heat exchanger.

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 non-prepublished DE Patent Application P 195 40 683.4 (& EP-A-0 772 018, Tecknik, according to Art. 54 (3) EPC) discloses that pairs of tabs are applied to thin sheets be diverge in the flow direction V-shaped. These tabs extend to about one Quarter or one third of the height of the rectangular tube, so that they have a height that is significantly higher than that Sheet thickness is. In DE Patentanmeldüng it is disclosed that these tabs are intended in particular as inserts, the at the joining of the rectangular tubes or even before the thin sheets are attached, e.g. by deep drawing and Compression.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art zu schaffen, das wirtschaftlich zu verwirklichen ist.The invention has for its object to provide a method of to create the type mentioned, the economically too is to realize.

Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des Anspruchs 1 gelöst. Im Anspruch 6 wird ein durch das Verfahren der Erfindung hergestellte Feinblech definiert.This task is done by a method having the features of claim 1 solved. In claim 6, a produced by the method of the invention Thin sheet defined.

Das erfindungsgemäße Verfahren hat den Vorteil, daß die Laschen und/oder Vorsprünge nicht nur einfach und preisgünstigan einem Feinblech oder Feinblechstreifen angebracht werden können, sondern daß auch die Laschen und/oder Vorsprünge massive Teile sind, die ohne Spalte o.dgl. an das Feinblech anschließen. Dadurch bilden sie keine korrosionsanfälligen Stellen.The inventive method has the advantage that the tabs and / or protrusions not only simple and preisgünstigan a thin sheet or thin sheet strips are attached can, but that the tabs and / or projections massive Parts are those without a column or the like. connect to the sheet. As a result, they do not form susceptible to corrosion Put.

Nach der Erfindung wird vorgesehen, daß das Feinblech im Bereich der Laschen und/oder Vorsprünge mittels Stempel und Matrize flächig über seine Fließgrenze hinaus belastet wird, wobei ein Teil des Blechmaterials in eine oder mehrere Aussparungen der Matrize und/oder des Stempels hineingedrückt wird, die als Negativformen den anzubringen Laschen und/oder Vorsprüngen entsprechen. Dadurch lassen sich in einfacher Weise unter Einhaltung relativ enger Toleranzen Laschen und/oder Vorsprünge an dem Feinblech anbringen.According to the invention it is provided that the thin sheet in the region of the tabs and / or projections by means Stamp and die loaded flat over its yield point is, wherein a part of the sheet material in one or several recesses of the die and / or stamp pressed is to attach the tabs as negative molds and / or projections correspond. This can be done in a simple manner while maintaining relatively tight tolerances Attach tabs and / or projections to the sheet.

Eine vorteilhafte Anwendung der nach dem erfindungsgemäßen Verfahren hergestellten Feinbleche und insbesondere Feinblechstreifen besteht darin, daß ein Rechteckrohr für einen Wärmeübertrager, insbesondere für einen Abgaswärmeübertrager aus zwei U-förmigen Feinblechschalen zusammengesetzt ist, mit den Merkmalen des Anspruchs 9. An advantageous application of the invention Method produced thin sheets and especially sheet metal strips is that a rectangular tube for a Heat exchanger, in particular for an exhaust gas heat exchanger is composed of two U-shaped thin sheet metal shells, with the features of claim 9.

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 10 betrifft einen Wärmeübertrager mit mindestens einem Rechteckrohr gemäß Anspruch 9.

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 10 relates to a heat exchanger with at least one rectangular tube according to claim 9.
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.The rectangular tube 10 shown in FIGS. 1 and 2, which is approximately in is drawn to four times its normal size is to Use in a heat exchanger and in particular a Exhaust heat exchanger determined. From a variety of such Rectangular tubes 10, a tube bundle is formed, which leads to the leadership is determined by exhaust. The ends of the tube bundles are each arranged in a gas-tight tube sheet, the Tube sheets together with an outer jacket surrounding the tube bundle a housing for guiding a liquid coolant form. This housing is between the two tube sheets with an inlet and an outlet for the liquid coolant Mistake. Such an exhaust gas heat exchanger is not in the 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 made of two U-shaped thin sheet metal shells 11, 12 composed, which at their webs close together are connected, in particular welded. From the floors the two sheet metal shells 11, 12 protrude to the interior of the Rectangular tube 10 out tabs 13, 14 from, which is about about a quarter to a third of the height of the rectangular tube extend. The tabs 13, 14 are each symmetrical in pairs arranged to the longitudinal center of the rectangular tube 10. she run in the flow direction of the gas to be guided V-shaped apart, with their flow direction facing ends keep a distance to each other. The paired arranged Tabs 13, 14 are repeated over the length of Rectangular tube 10 at regular intervals. Here are the Sheet metal shells 11, 12 offset in such a way to each other, that the tabs 13, 14 of the bottoms of the sheet metal shell 11th and the sheet metal shell 12 offset in the longitudinal direction to each other are arranged.

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 from the bottoms of the sheet metal shells 11, 12 by means of massive forming and in particular by means of a Extruded molding. For this purpose, the thin sheet strips, later transformed into thin sheet half shells 11, 12 become flat between a die and a stamp loaded with pressure such that the yield point of Sheet material is exceeded and a part of the sheet material in slots of a die (or stamp) flows in, which determine the shape of the tabs 13, 14. In the embodiment shown in FIGS. 1 and 2 The strips of sheet metal are made by means of a circular surface loaded, which surrounds the two tabs 13, 14. It can, however still other load areas are provided, for example square or rectangular areas or areas, adapted to the contour of the tabs to be formed 13, 14 are. The thin sheet metal strips, which have a sheet thickness of not more than 1.0 mm, are by means of extrusion to about 70% to about 50% of their original sheet thickness compressed, causing tabs 13, 14 from a height whose height is easily 1.5 times the original one Can be 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, a device is shown schematically by means of that performs the massive forming to form the tabs according to the invention can be. The device has a lower part 15, in which a die 16 is arranged. The die 16 has a recess 17, in which a sheet-metal strip 18 is inserted is. The thin sheet strip 18 is by means of the lower part 15 mounted guides 19 held in the recess 17. In the die 16 are slot-shaped recesses 20th provided as negative forms for the tabs to be formed 13, 14 serve.

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 undeliverable upper part 21, a stamp 22 is held, the between the guides 19 the sheet-metal strip 18 deliverable is, covering the area of the recesses 20 areally. The punch 22 has a flat, to the thin sheet 18 parallel punch surface 23, which is the area of the recesses 20 of the die 16 in a sufficiently large area covered. The stamp 22 is with its stamp face 23rd pressed into the sheet-metal strip 18 with sufficient force, so that the flow limit of the sheet material exceeded becomes. Part of the sheet material then flows into the recesses 20 and forms the tabs 13, 14, which in Fig. 1 and 2 are shown. The thin sheet is in the area the stamp surface 23 to about 70% to about 50% of the original Sheet thickness compressed. The impression depth depends on the height of the tabs to be formed. Conveniently, is the penetration depth of the punch surface 23 of the punch 22 limited by a depth stop. The recesses 20 may be open slots or have a depth that greater than the desired height of the tabs. The high of Lashing is determined by the indentation depth with which the Stamping surface 23 is pressed into the sheet 18. To mention is still that in the extrusion for extrusion usual lubricants are used to the punching 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 in a semi-warm state, for example up to 600 ° C or in the warm state, for example up to 1200 ° C, is carried out, it increases the flowability of the Sheet metal, so that smaller forming forces required are. As a material for the sheet-metal strips, for example a steel with the number 1.4539 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 device shown in Fig. 3 can be on the metal strip 18, the pairs of tabs 13, 14 intermittently form by the sheet 18 advanced intermittently and the Extrusion process by feeding the punch 22 also is performed in cycles. It is also possible, however similar extrusion by rolling the fine sheet strip perform. It can also be provided that a Median strip in which the tabs 13, 14 by massive forming be formed, constantly extruded and squeezed with it while still the tabs only in regular Distances are formed.

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 provided with a flat bearing surface, while the recesses 20 corresponding recesses in the punch 22 in Area of the punch surface 23 are provided. The attachment However, the recesses 20 in the die 16 has the advantage that the gas-carrying side of a formed from the sheet metal strip 18 Pipe except for the flaps 13, 14 smooth inner walls so that a deposit of solid particles or the like. is avoided.

Claims (10)

  1. Method for producing tabs and/or projections on sheet metal, in particular on a sheet metal strip, which project essentially at right angles from the base surface of the sheet metal and have a height which is greater than the thickness of the sheet metal, characterised in that the tabs (13, 14) and/or projections are shaped from the sheet metal (17) by impact extrusion, whereby the surface of the sheet metal is loaded and a part of the sheet metal material is pressed into one or more recesses of a female die and/or a male die.
  2. Method according to claim 1, characterised in that the sheet metal is loaded by means of a circular surface, a rectangular, in particular square, surface or a surface with a contour matching the tabs and/or projections to be produced.
  3. Method according to claim 1 or 2, characterised in that the tabs (13, 14) and/or projections are shaped by means of the intermittent feed of male die (22) and female die (16) and the intermittent advance of the sheet metal, in particular of the sheet metal strip (18).
  4. Method according to claim 1 or 2, characterised in that the solid-blank forming process of the sheet metal and in particular of the sheet metal strip (18) for producing tabs and/or projections is running continuously by means of rolls.
  5. Method according to any of claims 1 to 4, characterised in that the sheet metal (18) is reduced to approximately 70% to 50% of the original sheet metal thickness by means of impact extrusion in the region of the tabs (13, 14) and/or projections.
  6. Sheet metal, in particular sheet metal strip, from the base surface of which solid tabs and/or projections project and have a height which is greater than the thickness of the sheet metal, characterised in that the tabs (13, 14) and/or projections are shaped from the sheet metal (18) by means of impact extrusion involving the planar loading of the sheet metal.
  7. Sheet metal according to claim 6, characterised in that the sheet metal (18) reduced to approximately 70% to 50% of the original sheet metal thickness in the region of the tabs (13, 14) and/or projections.
  8. Sheet metal according to claim 7, characterised in that the tabs (13, 14) and/or projections are located on that side of the base surface which is not pressed in.
  9. 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.
  10. 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 9.
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)

Publication Number Publication Date
EP0851200A2 EP0851200A2 (en) 1998-07-01
EP0851200A3 EP0851200A3 (en) 1999-05-12
EP0851200B1 true EP0851200B1 (en) 2005-01-26
EP0851200B2 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
EP0851200A2 (en) 1998-07-01
DE59712183D1 (en) 2005-03-03
DE19654367A1 (en) 1998-06-25
JPH10193017A (en) 1998-07-28
US6070616A (en) 2000-06-06
EP0851200A3 (en) 1999-05-12
EP0851200B2 (en) 2010-03-17

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