EP0851200A2 - Process for arranging tabs and/or projections on a thin sheet and thin tube of rectangular cross section - Google Patents

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

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Publication number
EP0851200A2
EP0851200A2 EP97120668A EP97120668A EP0851200A2 EP 0851200 A2 EP0851200 A2 EP 0851200A2 EP 97120668 A EP97120668 A EP 97120668A EP 97120668 A EP97120668 A EP 97120668A EP 0851200 A2 EP0851200 A2 EP 0851200A2
Authority
EP
European Patent Office
Prior art keywords
tabs
sheet
thin sheet
projections
thin
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.)
Granted
Application number
EP97120668A
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German (de)
French (fr)
Other versions
EP0851200B1 (en
EP0851200B2 (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
Publication of EP0851200A2 publication Critical patent/EP0851200A2/en
Publication of EP0851200A3 publication Critical patent/EP0851200A3/en
Publication of EP0851200B1 publication Critical patent/EP0851200B1/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 sheet of thin sheet metal, which is essentially perpendicular to protrude from the base of the thin sheet and have a height, which is higher than the sheet thickness, as well as an afterwards manufactured sheet and one made of two sheets Rectangular tube for a heat exchanger.
  • the invention has for its object a method of to create the kind mentioned at the outset that economically too is realized.
  • the process according to the invention has the advantage that the tabs and / or projections not only simple and inexpensive a sheet or strip of sheet metal can, but that the tabs and / or protrusions are massive Parts are the like or without a column. connect to the thin sheet. As a result, they do not form susceptible to corrosion Put.
  • the thin sheet in the area of the tabs and / or projections by means of Stamp and die are loaded across its yield point is, with a part of the sheet material in one or several recesses in the die and / or the stamp are pressed in which, as negative forms, the tabs to be attached and / or protrusions.
  • This allows in a simple manner while maintaining relatively narrow tolerances Attach tabs and / or protrusions to the thin sheet.
  • a rectangular tube for one Heat exchanger, in particular for an exhaust gas heat exchanger is composed of two U-shaped sheet metal shells, whereby at least from the bottom of one of the sheet metal trays in pairs protrude arranged tabs inward, in the direction of flow Diverge in a V-shape using massive forming from the bottom at least one of the sheet metal trays are molded out.
  • the rectangular tube 10 shown in FIGS. 1 and 2 which in about is drawn four times its normal size Use in a heat exchanger and especially one Exhaust gas heat exchanger determined.
  • a tube bundle is formed, which is used for guidance is determined by exhaust gas.
  • the ends of the tube bundle are arranged gastight in each case in a 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 an inlet and an outlet for the liquid coolant Mistake.
  • Such an exhaust gas heat exchanger is not in the Pre-published German patent application P 195 40 683.4 disclosed.
  • the rectangular tube 10 is made of two U-shaped sheet metal shells 11, 12 assembled, which are close together at their webs are connected, in particular welded. From the floors of the two sheet metal shells 11, 12 protrude to the inside of the Rectangular tube 10 down tabs 13, 14, which are about extend a quarter to a third of the height of the rectangular tube.
  • the tabs 13, 14 are symmetrical in pairs arranged to the longitudinal center of the rectangular tube 10. She run in a V-shape in the direction of flow of the gas to be guided apart, their ends facing the direction of flow keep a distance from each other.
  • the arranged in pairs Tabs 13, 14 repeat over the length of the Rectangular tube 10 at regular intervals.
  • the Sheet metal trays 11, 12 arranged so offset to one another, that the tabs 13, 14 of the bottoms of the sheet metal tray 11 and the thin sheet metal shell 12 offset from one another in the longitudinal direction 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.
  • the thin sheet strips, which are later formed into the thin sheet metal half-shells 11, 12 become flat between a die and a stamp so loaded with pressure that the yield point of the Sheet material is exceeded and part of the sheet metal material in slots of a die (or also of the stamp) flows, which determine the shape of the tabs 13, 14.
  • FIGS. 1 and 2 are the thin sheet metal strips by means of a circular area loaded, which surrounds the two tabs 13, 14.
  • it can still other load areas are provided, for example square or rectangular surfaces or surfaces, adapted to the contour of the tabs 13, 14 to be formed are.
  • the thin sheet strips which have a sheet thickness of not exceed 1.0 mm, are extruded to about 70% to about 50% of their original sheet thickness compressed, causing tabs 13, 14 to be of one height result, the amount of which is easily 1.5 times the original Sheet thickness can be.
  • a device is shown schematically, by means of who carried out the massive forming to form the tabs can be.
  • the device has a lower part 15, in which a die 16 is arranged.
  • the die 16 has a recess 17 into which a sheet metal strip 18 is inserted is.
  • the thin sheet strip 18 is by means of the lower part 15 attached guides 19 held in the recess 17.
  • a stamp 22 In a lower part 15 with the application of a pressing force deliverable upper part 21, a stamp 22 is held, the between the guides 19 the sheet metal strip 18 can be delivered is, it covers the area of the recesses 20 area.
  • the stamp 22 has a flat, to the thin sheet 18 parallel stamp surface 23, the area of the recesses 20 of the die 16 in a sufficiently large area covered.
  • the stamp 22 is with its stamp surface 23 pressed into sheet metal strip 18 with sufficient force, so that the flow limit of the sheet material is exceeded becomes. Part of the sheet material then flows into the cutouts 20 and forms the tabs 13, 14, which are shown in Fig. 1 and 2 are shown.
  • the thin sheet is in the area the stamp area 23 to about 70% to about 50% of the original Sheet thickness compressed.
  • the depth of impression depends on the height of the tabs to be formed. Conveniently is the depth of penetration of the stamp surface 23 of the stamp 22 limited by a depth stop.
  • the cutouts 20 may be open slots or have a depth that is greater than the desired height of the tabs.
  • the high of Laschen is determined by the depth at which the Stamp surface 23 is pressed into the thin sheet 18. To mention is that with extrusion, that for extrusion usual lubricants are used to control the punching time to improve the tool.
  • Extrusion can be carried out when cold. If the extrusion is 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, the flowability of the Sheet material, so that smaller forming forces are required are.
  • a material for the thin sheet metal strip for example a steel with the number 1.4539 proved to be applicable.
  • Fig. 3 With the device shown in Fig. 3 can be the pairs of tabs 13, 14 in cycles shape by pushing the thin sheet 18 forward and the Extrusion process by delivering the stamp 22 also is carried out in cycles. However, it is also possible to use a similar extrusion by rolling the sheet metal strip perform. It can also be provided that a Median strip, in which the tabs 13, 14 by massive forming are formed, continuously extruded and thus compressed will while the tabs only come in regular Intervals are formed.
  • a die 16 provided with a flat support surface during the recesses 20 corresponding recesses in the stamp 22 in Area of the stamp surface 23 are provided.
  • the attachment the recesses 20 in the die 16 has the advantage that the gas-carrying side of one formed from the sheet metal strips 18 Tube except for the tabs 13, 14 smooth inner walls has, so that a deposit of solid particles or the like is avoided.

Abstract

The lugs (13,14) or protrusions are at right angles to the metal surface and extend for further than the thickness of the latter. The method involves using a punch and die to loading the metal beyond the yield point. Part of the metal can be pressed into recesses in the punch and/or die, which forms the negative mould for the lugs or protrusions. Formation can be by punch and die at intervals, while the sheet-metal strip is indexed forward.

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, 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 sheet of thin sheet metal, which is essentially perpendicular to protrude from the base of the thin sheet and have a height, which is higher than the sheet thickness, as well as an afterwards manufactured sheet and one made of two sheets Rectangular tube for a heat exchanger.

In der nicht vorveröffentlichten DE-Patentanmeldung P 195 40 683.4 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-Patentanmeldung ist offenbart, daß diese Laschen insbesondere als Einsätze vorgesehen werden, die beim Zusammenfügen der Rechteckrohre oder auch vorher an den Feinblechen angebracht werden. In the unpublished DE patent application P 195 40 683.4 discloses that tabs are attached to thin sheets in pairs that diverge in a V-shape in the direction of flow. These tabs extend to about one A quarter or a third of the height of the rectangular tube, see above that they have a height that is significantly higher than that Sheet thickness is. In the DE patent application it is disclosed that these tabs are provided in particular as inserts, the when joining the rectangular tubes or before the sheet metal.

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 a method of to create the kind mentioned at the outset that economically too is realized.

Diese Aufgabe wird dadurch gelöst, daß die Laschen und/oder Vorsprünge mittels Massivumformens aus dem Blech herausgeformt werden.This object is achieved in that the tabs and / or Projections formed from the sheet by means of massive forming will.

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 process according to the invention has the advantage that the tabs and / or projections not only simple and inexpensive a sheet or strip of sheet metal can, but that the tabs and / or protrusions are massive Parts are the like or without a column. connect to the thin sheet. As a result, they do not form susceptible to corrosion Put.

In Ausgestaltung 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.In an embodiment of the invention it is provided that the thin sheet in the area of the tabs and / or projections by means of Stamp and die are loaded across its yield point is, with a part of the sheet material in one or several recesses in the die and / or the stamp are pressed in which, as negative forms, the tabs to be attached and / or protrusions. This allows in a simple manner while maintaining relatively narrow tolerances Attach tabs and / or protrusions to the thin 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, wobei wenigstens von dem Boden einer der Feinblechschalen paarweise angeordnete Laschen nach innen abragen, die in Strömungsrichtung V-förmig auseinanderlaufen und die mittels Massivumformen aus dem Boden wenigstens einer der Feinblechschalen herausgeformt sind. An advantageous application of the according to the invention Process manufactured sheet metal and in particular sheet metal strips is that a rectangular tube for one Heat exchanger, in particular for an exhaust gas heat exchanger is composed of two U-shaped sheet metal shells, whereby at least from the bottom of one of the sheet metal trays in pairs protrude arranged tabs inward, in the direction of flow Diverge in a V-shape using massive forming from the bottom at least one of the sheet metal trays are molded out.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der beigefügten Beschreibung einer Vorrichtung zum Massivumformen von Feinblechen und eines aus massiv umgeformten Feinblechschalen gebildeten Rechteckrohres für einen Abgaswärmeübertrager.

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 features and advantages of the invention result from the attached description of a device for the massive forming of thin sheets and a rectangular tube formed from solidly formed thin sheet shells for an exhaust gas heat exchanger.
Fig. 1
FIG. 1 shows an end view of a rectangular tube for an exhaust gas heat exchanger, which is provided with tabs formed by means of massive forming from the bottom of the thin sheet metal shells,
Fig. 2
a view of a sheet metal shell in the area of two tabs and
Fig. 3
a device for performing 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 in about is drawn four times its normal size Use in a heat exchanger and especially one Exhaust gas heat exchanger determined. From a variety of such Rectangular tubes 10, a tube bundle is formed, which is used for guidance is determined by exhaust gas. The ends of the tube bundle are arranged gastight in each case in a 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 an inlet and an outlet for the liquid coolant Mistake. Such an exhaust gas heat exchanger is not in the Pre-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 sheet metal shells 11, 12 assembled, which are close together at their webs are connected, in particular welded. From the floors of the two sheet metal shells 11, 12 protrude to the inside of the Rectangular tube 10 down tabs 13, 14, which are about extend a quarter to a third of the height of the rectangular tube. The tabs 13, 14 are symmetrical in pairs arranged to the longitudinal center of the rectangular tube 10. she run in a V-shape in the direction of flow of the gas to be guided apart, their ends facing the direction of flow keep a distance from each other. The arranged in pairs Tabs 13, 14 repeat over the length of the Rectangular tube 10 at regular intervals. Here are the Sheet metal trays 11, 12 arranged so offset to one another, that the tabs 13, 14 of the bottoms of the sheet metal tray 11 and the thin sheet metal shell 12 offset from one another in the longitudinal direction 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. For this, the thin sheet strips, which are later formed into the thin sheet metal half-shells 11, 12 become flat between a die and a stamp so loaded with pressure that the yield point of the Sheet material is exceeded and part of the sheet metal material in slots of a die (or also of the stamp) flows, which determine the shape of the tabs 13, 14. In the embodiment shown in FIGS. 1 and 2 are the thin sheet metal strips by means of a circular area loaded, which surrounds the two tabs 13, 14. However, it can still other load areas are provided, for example square or rectangular surfaces or surfaces, adapted to the contour of the tabs 13, 14 to be formed are. The thin sheet strips, which have a sheet thickness of not exceed 1.0 mm, are extruded to about 70% to about 50% of their original sheet thickness compressed, causing tabs 13, 14 to be of one height result, the amount of which is easily 1.5 times the original Sheet thickness can be.

In Fig. 3 ist schematisch eine Vorrichtung dargestellt, mittels der das Massivumformen zum Bilden der Laschen 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 who carried out the massive forming to form the tabs can be. The device has a lower part 15, in which a die 16 is arranged. The die 16 has a recess 17 into which a sheet metal strip 18 is inserted is. The thin sheet strip 18 is by means of the lower part 15 attached guides 19 held in the recess 17. There are slot-shaped recesses 20 in the die 16 provided that 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 with the application of a pressing force deliverable upper part 21, a stamp 22 is held, the between the guides 19 the sheet metal strip 18 can be delivered is, it covers the area of the recesses 20 area. The stamp 22 has a flat, to the thin sheet 18 parallel stamp surface 23, the area of the recesses 20 of the die 16 in a sufficiently large area covered. The stamp 22 is with its stamp surface 23 pressed into sheet metal strip 18 with sufficient force, so that the flow limit of the sheet material is exceeded becomes. Part of the sheet material then flows into the cutouts 20 and forms the tabs 13, 14, which are shown in Fig. 1 and 2 are shown. The thin sheet is in the area the stamp area 23 to about 70% to about 50% of the original Sheet thickness compressed. The depth of impression depends on the height of the tabs to be formed. Conveniently is the depth of penetration of the stamp surface 23 of the stamp 22 limited by a depth stop. The cutouts 20 may be open slots or have a depth that is greater than the desired height of the tabs. The high of Laschen is determined by the depth at which the Stamp surface 23 is pressed into the thin sheet 18. To mention is that with extrusion, that for extrusion usual lubricants are used to control the punching time to improve 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.Extrusion can be carried out when cold. If the extrusion is 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, the flowability of the Sheet material, so that smaller forming forces are required are. As a material for the thin sheet metal strip, 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 the pairs of tabs 13, 14 in cycles shape by pushing the thin sheet 18 forward and the Extrusion process by delivering the stamp 22 also is carried out in cycles. However, it is also possible to use a similar extrusion by rolling the sheet metal strip perform. It can also be provided that a Median strip, in which the tabs 13, 14 by massive forming are formed, continuously extruded and thus compressed will while the tabs only come in regular Intervals 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 support surface during the recesses 20 corresponding recesses in the stamp 22 in Area of the stamp surface 23 are provided. The attachment the recesses 20 in the die 16, however, has the advantage that the gas-carrying side of one formed from the sheet metal strips 18 Tube except for the tabs 13, 14 smooth inner walls has, so that a deposit of solid particles or the like is avoided.

Claims (9)

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, dadurch gekennzeichnet, daß die Laschen (13, 14) und/oder Vorsprünge mittels Massivumformens aus dem Feinblech (17) herausgeformt werden.Method of attaching tabs and / or protrusions on a thin sheet, especially on a thin sheet, which are essentially perpendicular to the Protrude the base of the thin sheet and have a height, which is higher than the sheet thickness, characterized in that that the tabs (13, 14) and / or projections by means of massive forming from the thin sheet (17) be molded out. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Feinblech (18) im Bereich der Laschen (13, 14) und/oder Vorsprünge mittels Stempel und Matrize flächig über seine Fließgrenze hinaus belastet wird, wobei ein Teil des Blechmaterials in eine oder mehrere Aussparungen (20) der Matrize (16) und/oder des Stempels hineingedrückt wird, die als Negativform der anzubringenden Laschen und/oder Vorsprünge dient.A method according to claim 1, characterized in that the thin sheet (18) in the area of the tabs (13, 14) and / or flat projections by means of stamps and dies is loaded beyond its yield point, with a Part of the sheet material in one or more recesses (20) of the die (16) and / or the stamp pressed in will be used as the negative form of the Tabs and / or projections is used. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Laschen (13, 14) und/oder Vorsprünge mittels taktweisen Zustellens von Stempel (22) und Matrize (16) und taktweisen Vorschiebens des Feinbleches, insbesondere des Feinblechstreifens (18), geformt werden.A method according to claim 1 or 2, characterized in that that the tabs (13, 14) and / or projections by means intermittent delivery of stamp (22) and die (16) and intermittent advancement of the thin sheet, in particular of the thin sheet metal strip (18). Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Massivumformen des Feinbleches und insbesondere des Feinblechstreifens (18) zum Erzeugen von Laschen und/oder Vorsprüngen mittels Walzen kontinuierlich durchgeführt wird.A method according to claim 1 or 2, characterized in that that the massive forming of the thin sheet and in particular of the thin sheet metal strip (18) for producing Tabs and / or projections by means of rolling continuously is carried out. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Feinblech (18) im Bereich der Laschen (13, 14) und/oder Vorsprünge auf etwa 70% bis etwa 50% der ursprünglichen Blechstärke mittels Fließpressens eingedrückt wird. Method according to one of claims 1 to 4, characterized in that that the thin sheet (18) in the area of the tabs (13, 14) and / or protrusions from about 70% to about 50% of the original sheet thickness using extrusion is pushed in. Feinblech, insbesondere Feinblechstreifen, von dessen Grundfläche Laschen und/oder Vorsprünge abragen und eine Höhe aufweisen, die höher als die Blechstärke ist, dadurch gekennzeichnet, daß die Laschen (13, 14) und/oder Vorsprünge mittels Massivumformens aus dem Feinblech (18) herausgeformt sind.Thin sheet, especially thin sheet strips, of which Base plates and / or protrusions protrude and one Have a height that is higher than the sheet thickness, characterized in that the tabs (13, 14) and / or projections by means of massive forming from the Thin sheet (18) are formed. Feinblech nach Anspruch 6, dadurch gekennzeichnet, daß das Feinblech (18) im Bereich der Laschen (13, 14) und/oder Vorsprünge auf etwa 70% bis etwa 50% der ursprünglichen Blechstärke eingepreßt ist.Sheet according to claim 6, characterized in that the thin sheet (18) in the area of the tabs (13, 14) and / or protrusions to about 70% to about 50% of the original Sheet thickness is pressed. Feinblech nach Anspruch 7, dadurch gekennzeichnet, daß die Laschen (13, 14) und/oder Vorsprünge sich auf der Seite der Grundfläche befinden, die nicht eingepreßt ist.Sheet according to claim 7, characterized in that the tabs (13, 14) and / or projections on the Side of the base area that are not pressed is. Rechteckrohr für einen Wärmeübertrager, insbesondere für einen Abgaswärmeübertrager, das aus zwei U-förmigen Feinblechschalen zusammengesetzt ist, wobei wenigstens von dem Boden einer der Feinblechschalen paarweise angeordnete Laschen nach innen abragen, die in Strömungsrichtung V-förmig auseinanderlaufen, dadurch gekennzeichnet, daß die Laschen (13, 14) mittels Massivumformens aus dem Boden wenigstens einer der Feinblechschalen (11, 12) herausgeformt sind.Rectangular tube for a heat exchanger, in particular for an exhaust gas heat exchanger that consists of two U-shaped Sheet metal shells is composed, at least from the bottom of one of the sheet metal trays arranged in pairs The tabs protrude inwards in the direction of flow Diverge in a V-shape, characterized in that that the tabs (13, 14) by means of massive forming from the bottom at least one of the sheet metal trays (11, 12) are formed.
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)

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DE19654367 1996-12-24
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

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

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Also Published As

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

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