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DE1290388B - Process for the production of composite pipes with internal ribs - Google Patents

Process for the production of composite pipes with internal ribs

Info

Publication number
DE1290388B
DE1290388B DEC33939A DEC0033939A DE1290388B DE 1290388 B DE1290388 B DE 1290388B DE C33939 A DEC33939 A DE C33939A DE C0033939 A DEC0033939 A DE C0033939A DE 1290388 B DE1290388 B DE 1290388B
Authority
DE
Germany
Prior art keywords
pipe
inner tube
jacket
tube
yield strength
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.)
Pending
Application number
DEC33939A
Other languages
German (de)
Inventor
Seaton Ralph Edward
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CALUMET AND HECLA CORP
Original Assignee
CALUMET AND HECLA CORP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CALUMET AND HECLA CORP filed Critical CALUMET AND HECLA CORP
Publication of DE1290388B publication Critical patent/DE1290388B/en
Pending legal-status Critical Current

Links

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
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/085—Heat exchange elements made from metals or metal alloys from copper or copper alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, wire, rods, tubes or like semi-manufactured products by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes specially adapted for making tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, rods or tubes
    • B21C23/10—Making finned tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/22—Making metal-coated products; Making products from two or more metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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
    • B21C37/154—Making multi-wall tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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 or tubes with decorated walls
    • B21C37/202—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 or tubes with decorated walls with guides parallel to the tube axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/22—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded
    • B23K20/233—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded without ferrous layer
    • B23K20/2333—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded without ferrous layer one layer being aluminium, magnesium or beryllium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
    • B23K31/027—Making tubes with soldering or welding
    • 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
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • 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
    • F28F1/003—Multiple wall conduits, e.g. for leak detection
    • 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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of 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
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • 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
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49361—Tube inside tube
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49377—Tube with heat transfer means
    • Y10T29/49378—Finned tube
    • Y10T29/49384—Internally finned
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49925—Inward deformation of aperture or hollow body wall
    • Y10T29/49927—Hollow body is axially joined cup or tube
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49925—Inward deformation of aperture or hollow body wall
    • Y10T29/49934—Inward deformation of aperture or hollow body wall by axially applying force

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Extrusion Of Metal (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Verbundrohren mit Innenrippen, insbesondere für Kühlschlangen, bei dem auf ein mit inneren Längsrippen versehenes Innenrohr aus Aluminium oder einer Aluminiumlegierung ein Mantelrohr aus einem anderen Metall aufgesteckt und durch Ziehen in dauernde Anlage an das Innenrohr gebracht wird.The invention relates to a method for producing composite pipes with inner ribs, in particular for cooling coils, in which one with inner longitudinal ribs provided inner pipe made of aluminum or an aluminum alloy is a jacket pipe made of another metal and pulled into permanent contact with the Inner tube is brought.

Bei einem derartigen bereits bekannten Verfahren besteht das Mantelrohr aus einem Stahl, wodurch das Verbundrohr eine hohe Festigkeit erhalten soll. Dabei ist der Innendurchmesser des Mantelrohrs zunächst größer als der Außendurchmesser des Innenrohrs, so daß beide Rohre vor dem Ziehvorgang ineinandergesteckt werden können. Beim Ziehvorgang wird dann der Durchmesser des Mantelrohrs in einem solchen Ausmaße verringert, daß die beiden Rohre unter Bildung eines Verbundrohrs aneinander anliegen. Mit diesem Verfahren können auch lange Verbundrohre hergestellt werden, ohne daß sich besondere Schwierigkeiten ergeben, wie es beim Zusammenschrumpfen von zwei Rohren zu einem Verbundrohr der Fall ist, bei dem die Durchmesser des Mantelrohrs und des Innenrohrs so gewählt sind, daß die Rohre unterschiedliche Temperaturen aufweisen müssen, um ineinandergesteckt werden zu können. Das bekannte Verfahren, bei dem das Mantelrohr einem Ziehvorgang unterworfen wird, führt jedoch zu einem Verbundrohr, dessen Wärmeleitfähigkeit zwischen dem Innenumfang und dem Außenumfang zu wünschen übrigläßt. Dieser Nachteil ist darauf zurückzuführen, daß an der Trennfläche zwischen dem Innenrohr und dem Mantelrohr ein zusätzlicher Widerstand für den Wärmedurchgang gegeben ist, da das Innenrohr und das Mantelrohr nicht an allen Punkten dicht aneinanderliegen.In such an already known method, there is the jacket pipe made of a steel, whereby the composite pipe should receive a high strength. Included the inside diameter of the jacket pipe is initially larger than the outside diameter of the inner tube, so that both tubes are plugged into one another before the drawing process can. During the drawing process, the diameter of the jacket pipe is then in such a Reduced dimensions that the two tubes together to form a composite tube issue. This process can also be used to produce long composite pipes, without causing any particular difficulties, as is the case with shrinking from two pipes to a composite pipe is the case in which the diameter of the jacket pipe and the inner tube are chosen so that the tubes have different temperatures must have in order to be able to be plugged into one another. The well-known procedure in which the jacket pipe is subjected to a drawing process, however, leads to a Composite pipe, its thermal conductivity between the inner circumference and the outer circumference leaves a lot to be desired. This disadvantage is due to the fact that at the interface between the inner tube and the jacket tube an additional resistance for the passage of heat is given because the inner tube and the jacket tube do not lie close to one another at all points.

Der Erfindung liegt die Aufgabe zugrunde, das eingangs genannte Verfahren derart zu verbessern, daß auf einfache Weise ein Verbundrohr hergestellt wird, daß an der Übergangsstelle zwischen den beiden Rohren kein zusätzlicher Widerstand für den Wärmedurchgang vorhanden ist. Diese Aufgabe wird dadurch gelöst, daß das Mantelrohr aus Kupfer oder einer Kupferlegierung mit erheblich niedrigerer Dehngrenze als das Innenrohr besteht und beim Ziehvorgang so stark über seine Dehngrenze verformt wird, daß das Innenrohr eine erhebliche elastische Verformung erfährt.The invention is based on the object of the aforementioned method to improve so that a composite pipe is produced in a simple manner that at the transition point between the two pipes no additional resistance for the heat transfer is available. This object is achieved in that the jacket pipe made of copper or a copper alloy with a significantly lower yield strength than that The inner tube exists and is deformed so much over its elastic limit during the drawing process, that the inner tube experiences a considerable elastic deformation.

Wird das Verbundrohr in dieser Weise hergestellt, so werden während des Ziehvorgangs beide Rohre eingeschnürt, wobei jedoch das Innenrohr infolge seiner elastischen Verformung mit einer radialen Expansionskraft an dem bleibend verformten Mantelrohr anliegt. Infolge dieser bleibenden Radialspannung, mit der die beiden Rohre aneinandergedrückt sind, ist ein guter Wärmeübergang bzw. Wärmedurchgang an der Trennfläche zwischen dem Mantelrohr und dem Innenrohr erreicht, so daß sich das Verbundrohr wie ein entsprechend starkes Rohr aus homogenem Werkstoff verhält, für das abgesehen vom Wärmeübergang vom Innen- und Außenumfang des Rohrs nur die Wärmeleitfähigkeit des Werkstoffs und die Rohrstärke maßgebend ist.If the composite pipe is produced in this way, then during the drawing process constricts both tubes, but the inner tube as a result of it elastic deformation with a radial expansion force on the permanently deformed Casing pipe is applied. As a result of this remaining radial tension with which the two Pipes are pressed together, a good heat transfer or heat transfer is on reached the interface between the jacket tube and the inner tube, so that the composite pipe behaves like a suitably strong pipe made of homogeneous material, for that, apart from the heat transfer from the inner and outer circumference of the pipe, only the Thermal conductivity of the material and the pipe thickness are decisive.

Zwar sind Verbundrohre, bei denen ein Innenrohr und ein Mantelrohr infolge thermischen Zusämmenschrumpfens mit bleibender Radialspannung aneinanderliegen, bereits bekannt, das Verfahren der thermischen Schrumpfung ist jedoch vergleichsweise kompliziert und läßt sich bei der Herstellung von langen Rohren nicht anwenden. Ferner ist es auch bereits bekannt, ein Rohr mit die Festigkeit erhöhenden Bandagenringen zu umgeben und das Rohr unter überschreiten seiner Elastizitätsgrenze aufzuweiten, so daß die Bandagenringe, die eine beträchtlich höhere Elastizitätsgrenze aufweisen, mit radialer Vorspannung am aufgeweiteten Rohr anliegen. Hierbei handelt es sich jedoch nur um eine Maßnahme zur Erhöhung der Festigkeit des einen glatten Innenumfang aufweisenden Rohrs und nicht um die Herstellung eines Verbundrohrs, das einen geringen Wärmedurchgangswiderstand aufweisen soll.It is true that composite pipes, in which an inner pipe and a jacket pipe due to thermal shrinkage with permanent radial tension, already known, but the process of thermal shrinkage is comparative complicated and cannot be used in the manufacture of long pipes. Furthermore, it is already known to use a pipe with bandage rings which increase the strength to surround and expand the pipe by exceeding its elastic limit, so that the bandage rings, which have a considerably higher elastic limit, rest against the expanded tube with radial prestress. This is it but only a measure to increase the strength of a smooth inner circumference having pipe and not about the production of a composite pipe that has a low Should have thermal resistance.

Zweckmäßigerweise bestehen das Innenrohr aus einer Aluminiumlegierung mit einer Dehngrenze von etwa 1125 kg/cm2 und das Mantelrohr aus Kupfer mit einer Dehngrenze von etwa 420 kg/cm2. Es hat sich gezeigt, daß bei Verwendung derartiger Rohrwerkstoffe ausgezeichnete Ergebnisse erzielt werden.The inner tube expediently consists of an aluminum alloy with a yield strength of about 1125 kg / cm2 and the jacket pipe made of copper with a Yield strength of about 420 kg / cm2. It has been shown that when using such Pipe materials excellent results can be achieved.

Ein Ausführungsbeispiel eines erfindungsgemäß hergestellten Verbundrohrs ist in der Zeichnung schematisch dargestellt. Es zeigt F i g. 1 eine Stirnansicht des erfindungsgemäß hergestellten Verbundrohrs, F i g. 2 eine Stirnansicht des Innenrohrs vor der Verbindung mit dem Mantelrohr und F i g. 3 ein in vergrößertem Maßstab gezeichneter Teilquerschnitt durch das Innenrohr.An embodiment of a composite pipe produced according to the invention is shown schematically in the drawing. It shows F i g. 1 is an end view of the composite pipe produced according to the invention, FIG. 2 is an end view of the inner tube before the connection with the jacket pipe and F i g. 3 a drawn on an enlarged scale Partial cross-section through the inner tube.

Gemäß F i g. 1 umfaßt das -Verbundrohr 10 ein Innenrohr 12 mit Längsrippen 14, die in radialer Richtung über den Innenumfang des Innenrohrs 12 vorspringen. Das Innenrohr 12 ist von einem Mantelrohr 16 umgeben, wobei die beiden Rohre 12 und 16 mit radialer Vorspannung aneinandergedrückt sind.According to FIG. 1, the composite pipe 10 comprises an inner pipe 12 with longitudinal ribs 14, which protrude in the radial direction over the inner circumference of the inner tube 12. The inner tube 12 is surrounded by a jacket tube 16, the two tubes 12 and 16 are pressed against one another with radial prestress.

Bei einem speziellen Beispiel, das zu besonders guten Ergebnissen geführt hat, wurde das Innenrohr 12 aus einer Aluminiumlegierung durch Strangpressen hergestellt. Nach einer Alterungshärtung des Innenrohrs 12 wies die Aluminiumlegierung eine Dehngrenze von etwa 1125 kg/cm2 aus, wobei der Außendurchmesser des Innenrohrs 12 etwa 17,5 mm bei einer Wandstärke von etwa--0,65 mm betrug. Das zusammen mit diesem Innenrohr 12 verwendete Mantelrohr 16 bestand aus Kupfer mit einer Dehngrenze von etwa 420 kg/cm2 und wies einen Außendurchmesser von etwa 20,3 mm bei einer Wandstärke von etwa 0,9 mm auf. Zur Durchführung des Ziehvorgangs wurde das Mantelrohr 16 mit dem eingeschobenen Innenrohr 12 durch- ein Ziehwerkzeug mit einem Öffnungsdurchmesser von 19 mm gezogen. Dadurch wurden die beiden Rohre 12 und 16 zu einem Verbundrohr 10 miteinander vereinigt, bei dem beide Rohre mit radialer Spannung aneinandergedrückt sind. Das so hergestellte Verbundrohr 10 weist einen geringen Wärmedurchgangswiderstand auf und ist daher insbesondere für Kühlschlangen verwendbar. Dabei führt die Anordnung der Rippen 14 zu einer erheblichen Vergrößerung der Innenfläche des Verbundrohrs 10, so daß ein guter Wärmeaustausch auch dann erreicht wird, wenn ein gasförmiges Medium durch das Verbundrohr strömt, während das für das Mantelrohr 16 verwendete Kupfer eine hohe Korrosionsbeständigkeit bietet, so daß das Verbundrohr 10 auf seiner Außenseite von einem korrodierend wirkenden Medium, beispielsweise Wasser, umspült werden kann.In the case of a special example, that leads to particularly good results has resulted, the inner pipe 12 was made of an aluminum alloy by extrusion manufactured. After aging hardening of the inner tube 12, the aluminum alloy exhibited a yield strength of about 1125 kg / cm2, the outer diameter of the inner tube 12 was about 17.5 mm with a wall thickness of about -0.65 mm. That along with This inner tube 12 used jacket tube 16 was made of copper with a yield strength of about 420 kg / cm2 and had an outer diameter of about 20.3 mm with a wall thickness of about 0.9 mm. To carry out the drawing process, the jacket tube 16 was with the inserted inner tube 12 through a drawing tool with an opening diameter pulled by 19 mm. As a result, the two pipes 12 and 16 became a composite pipe 10 combined with each other, in which both tubes are pressed against one another with radial tension are. The composite pipe 10 produced in this way has a low heat transfer resistance and is therefore particularly suitable for cooling coils. The arrangement leads of the ribs 14 to a considerable increase in the inner surface of the composite pipe 10, so that a good heat exchange is achieved even if a gaseous Medium flows through the composite pipe, while that used for the jacket pipe 16 Copper offers high corrosion resistance, so that the composite pipe 10 on its A corrosive medium, for example water, washes around the outside can be.

Claims (2)

Patentansprüche: 1. Verfahren zur Herstellung von Verbundrohren mit Innenrippen, insbesondere für Kühlschlangen, bei dem auf ein mit inneren Längsrippen versehenes Innenrohr aus Aluminium oder einer Aluminiumlegierung ein Mantelrohr aus einem anderen Metall aufgesteckt und durch Ziehen in dauernde Anlage an das Innenrohr gebracht wird, dadurch gekennzeichnet, daß das Mantelrohr (16) aus Kupfer oder einer Kupferlegierung mit erheblich niedrigerer Dehngrenze als das Innenrohr (12) besteht und beim Ziehvorgang so stark über seine Dehngrenze verformt wird, daß das Innenrohr eine erhebliche elastische Verformung erfährt. Claims: 1. Process for the production of composite pipes with Inner ribs, in particular for cooling coils, in which one with inner longitudinal ribs provided inner pipe made of aluminum or an aluminum alloy is a jacket pipe made of another metal and pulled into permanent contact with the Inner tube is brought, characterized in that the jacket tube (16) made of copper or a copper alloy with a significantly lower yield strength than the inner tube (12) exists and is deformed so much over its elastic limit during the drawing process, that the inner tube experiences a considerable elastic deformation. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Innenrohr (12) aus einer Aluminiumlegierung mit einer Dehngrenze von etwa 1125 kg/cm2 und das Mantelrohr (16) aus Kupfer mit einer Dehngrenze von etwa 420 kg/ cm2 bestehen.2. Procedure according to Claim 1, characterized in that the inner tube (12) is made of an aluminum alloy with a yield strength of about 1125 kg / cm2 and the jacket pipe (16) made of copper a yield strength of about 420 kg / cm2 exist.
DEC33939A 1963-09-30 1964-09-21 Process for the production of composite pipes with internal ribs Pending DE1290388B (en)

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US3267563A (en) 1966-08-23
NL6410800A (en) 1965-03-31
GB1045618A (en) 1966-10-12
SE324265B (en) 1970-05-25
BE653792A (en)

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