DE2557215A1 - Stiffening thin walled tubes - by applying external air pressure whilst internally supporting with spaced rings or spirals - Google Patents
Stiffening thin walled tubes - by applying external air pressure whilst internally supporting with spaced rings or spiralsInfo
- Publication number
- DE2557215A1 DE2557215A1 DE19752557215 DE2557215A DE2557215A1 DE 2557215 A1 DE2557215 A1 DE 2557215A1 DE 19752557215 DE19752557215 DE 19752557215 DE 2557215 A DE2557215 A DE 2557215A DE 2557215 A1 DE2557215 A1 DE 2557215A1
- Authority
- DE
- Germany
- Prior art keywords
- thin
- tubes
- cylindrical container
- container according
- walled
- 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.)
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Classifications
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- 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
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes
-
- 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
- B21C37/12—Making tubes or metal hoses with helically arranged seams
- B21C37/124—Making tubes or metal hoses with helically arranged seams the tubes having a special shape, e.g. with corrugated wall, flexible tubes
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- 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
- B21D15/00—Corrugating tubes
- B21D15/04—Corrugating tubes transversely, e.g. helically
- B21D15/10—Corrugating tubes transversely, e.g. helically by applying fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/22—Corrugating
- B29C53/30—Corrugating of tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/022—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/0014—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for shaping tubes or blown tubular films
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/006—Using vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/007—Using fluid under pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/18—Pleated or corrugated hoses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
Abstract
Description
Verfahren zur Verformung dünnwandiger Rohr- und dünnwandigerProcess for deforming thin-walled tubular and thin-walled
zylindrischer Behälterwände und Verwendung derselben.cylindrical container walls and use of the same.
Die Erfindung betrifft dünnwandige Rohre und zylindrische Behälter insbesondere aus Metall oder Kunststoff, deren Festigkeit im Verhältnis zu ihrem Gewicht groß ist und die günstige Strömungs- und Wärmeübergangseigensdhaften besitzen.The invention relates to thin-walled tubes and cylindrical containers in particular made of metal or plastic, their strength in relation to their Weight is large and has favorable flow and heat transfer properties.
Dünnwandige Rohre sollen häufig gleichzeitig Scheitelkräften und Biegekräften standhalten. Das gilt zum Beispiel, wenn freitragende Rohrabschnitte mit großer Längs stabilität zum Transport von Flüssigkeiten oder Gasen benötigt werden.Thin-walled pipes are often supposed to have peak forces and bending forces at the same time withstand. This applies, for example, when unsupported pipe sections with large Longitudinal stability for the transport of liquids or gases are required.
Von dünnwandigen zylindrischen Behältern wird häufig eine relativ große Formstabilität verlangt, Zum Versteifen düzmwandiger Rohre sind zahlreiche Verfahren bekannt. Auf dem Rohr spiralförmig angebrachte Drahtwendeln (Offenlegungsschrift BRD Nr. 2027583) oder Sicken (Offenlegungsschrift ERD Nr. 1452774) erhöhen zwar die Festigkeit gegenüber Scheitelkräften. Die Festigkeit gegenüber Biegekräften bleibt jedoch gering.Of thin-walled cylindrical containers, a relative Great dimensional stability is required, for stiffening düzmwandiger pipes there are numerous Procedure known. Wire coils attached in a spiral to the pipe (Offenlegungsschrift BRD No. 2027583) or beads (Offenlegungsschrift ERD No. 1452774) increase the strength against peak forces. The strength against bending forces however, remains low.
Längsförmige Sicken halten dagegen zwar größeren Biegekräften nicht jedoch erhöhten Scheitelkräften stand.Longitudinal beads, on the other hand, do not hold greater bending forces however, increased vertex forces stood.
Derartige Verfahren haben den Nachteil, da13 sie nur an einigen Stellen die Rohrwand versteifen nicht jedoch die Rohrwand insgesamt versteifen, Der Erfindung liegt die Aufgabe zugrunde, dünnwandige Rohre oder dünnwandige zylindrische Behälter dadurch zu verfestigen, daß die gesamte Rohr- bzw. zylindrische Behälterwand in einfacher Weise verformt wird und dadurch eine erhöhte Formstabilität gegenüber Scheitel- und Biegekräften erhält. Gleichzeitig sollen die Strömungs- und Wärmeübergangsverhältnisse günstig sein, Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Rohr- oder zylindrische Behälterwand, welche durch Stützringe oder durch eine Stützspirale abgestützt werden, infolge erhöhten Außendruck auf die äußere Rohr- oder zylindrische Boehälterwandseite wabenförmig verformt werden, Die folgenden Erläuterungen gelten in gleicher Weise für dünnwandige Rohre und dünnwandige zylindrische Behälter.Such methods have the disadvantage that they only work in a few places stiffen the pipe wall but not stiffen the pipe wall as a whole, of the invention is based on the task of thin-walled tubes or thin-walled cylindrical containers to solidify that the entire pipe or cylindrical container wall in is easily deformed and thereby increased dimensional stability compared Receives vertex and bending forces. At the same time, the flow and heat transfer conditions should This object is achieved according to the invention in that the pipe or cylindrical container wall, which is supported by support rings or a support spiral be supported, due to increased external pressure on the outer tubular or cylindrical The container wall side can be deformed in a honeycomb shape, the following explanations apply in the same way for thin-walled pipes and thin-walled cylindrical containers.
Sigur 1 erläutert die Wabenbildung am Beispiel eines einfachen Prinzips für kurze Rohrabschnitte: Die in das glatte Rohrstück 1 eingesetzten Stützringe (oder stattdess#n eine Stützspirale) 2 liegen an der Rohrinnenwand eng an. Die Rohrenden werden durch Dichtungsringe 3 und durch zwei Spannringe 4 gegenüber dem Druckbehälter 5 abgedichtet.Sigur 1 explains honeycomb formation using a simple principle as an example For short pipe sections: The support rings inserted into the smooth pipe section 1 (or instead of a support spiral) 2 lie close to the inner wall of the pipe. The pipe ends are by sealing rings 3 and by two clamping rings 4 opposite the pressure vessel 5 sealed.
Bei hinreichendem Ueberdruck P in dem Raum zwischen dem dünnwandigen Rohr und dem Druckbehälter entstehen regelmäßige, zueinander versetzte wabenförmige Einbuchtungen in der gesamten Rohrwand (Figur 2)e Versuche zeigten, daß die Anzahl der Waben n auf dem Kreisumfang des Rohres hauptsächlich von dem Rohrdurchmesser D, dem abstand der Stützringe h und nur geringfügig von der Dicke d der Rohrwand abhängt.With sufficient overpressure P in the space between the thin-walled The pipe and the pressure vessel result in regular, mutually offset honeycomb-shaped Indentations in the entire pipe wall (Figure 2) e tests showed that the number of the honeycomb n on the circumference of the pipe mainly depends on the pipe diameter D, the distance between the support rings h and only slightly from the thickness d of the pipe wall depends.
Für diinnwandige Rohre (D-35inin bis 42mm; d-O,075mm bis 0,3mm) aus Metallfolien (Kupfer, Messing ~Stahlblech) ergab sich aus zahlreichen Versuchen bei Raumtemperatur die folgende empirische Formel zur Bestimmung der Anzahl der Waben n auf dem Kreisumfang: (Maßzahlen von D,h,d in mm) Diese Formel gestattet in guter Näherung eine Vorausberechnung der Anzahl der Waben n und somit auch der Größe der Waben, Bei Rohren aus Kunststoffen muß die Wabenverformung bei erhöhten Teinperaturen(PVC-Hart bei ca, 65°C; Plexiglas bei ca, 1100C) erfolgen, damit die Rohrwand infolge Spr-ödigkeit nicht zerspringt, B-emerkenswerterweise gilt die obengenannte Formel in guter Näherung auch für Kunststoffrohre.For thin-walled pipes (D-35inin to 42mm; dO, 075mm to 0.3mm) made of metal foils (copper, brass ~ sheet steel), the following empirical formula for determining the number of honeycombs n on the circumference resulted from numerous tests at room temperature: (Dimensions of D, h, d in mm) This formula allows a good approximation to calculate the number of honeycombs n and thus also the size of the honeycombs ° C; Plexiglas at approx. 1100C) so that the pipe wall does not crack as a result of brittleness. Remarkably, the above formula also applies to a good approximation for plastic pipes.
Die Versuche deuten darauf hBn, daß sich das Rohr während der Waben-Verformung in einem elastisch-plastischen vbergangszustand befinden muß, Während der Verformung hört man akustisch das Einbeulen der Rohrwand, Die zur Wabenverformung erforderlichen Drücke P hängen von der Materialdicke d, dem Durchmesser D, dem Abstand h und von der Festigkeit des Rohrmaterials ab. Als Richtwerte gelten für dümiwandige Metallrohre (dv 2mm) P=1atü bis 8atü und für dünnwandige Kunststoffrohre (d= 0,2mm bis 0,8mm) E= O,5atü bis 6atü.The experiments indicate that the tube is bent during the honeycomb deformation must be in an elastic-plastic transition state during deformation you can hear the denting of the pipe wall acoustically, which is necessary for the honeycomb deformation Pressures P depend on the material thickness d, the diameter D, the distance h and from the strength of the pipe material. Guide values apply to thin-walled metal pipes (dv 2mm) P = 1atü to 8atü and for thin-walled plastic pipes (d = 0.2mm to 0.8mm) E = 0.5atü to 6atü.
Bei größeren Drücken P werden die Wabeneindrücke tiefer, wodurch die Formstabilität der Rohrwand weiter erhöht wird.At higher pressures P, the honeycomb impressions are deeper, whereby the Dimensional stability of the pipe wall is further increased.
Die Beanspruchungen des Rohrmaterials durch Wabenverformungen sind relativ gering. Das beweisen spannungsoptische Bilder an wabenverformten Kunststoffrohren.The stresses on the pipe material due to honeycomb deformations are relatively low. This is proven by optical stress images on honeycomb-shaped plastic pipes.
Das wabenförmige Profil der Rohrwand bleibt auch erhalten, wenn die Rohrwand längst aufgeschnitten und zu einem leicht gekrümmen ader ebenen Profilblech mit erhöhter Bormsbilität aufgebogen wird.The honeycomb profile of the pipe wall is also retained when the Pipe wall cut open long ago and turned into a slightly curved, flat profile sheet is bent up with increased bendability.
Die folgenden zwei Belastungsversuchsreihen gestatten einen Vergleich der Festigkeiten von glatten und wabenverformten Rohren: Ein Rohrstück, deXen Rohrenden nicht fixiert sind, wird durch Scheitelkräfte belastet. Figur 3 zEigt als Beispiel das Weg-Kraft-Diagramm für Rohre (D-9Omm) aus O,lmm Messing-Hart-Folie.The following two series of load tests allow a comparison the strength of smooth and honeycomb-shaped pipes: One pipe section, deXen pipe ends are not fixed, is loaded by vertex forces. Figure 3 shows as an example the displacement-force diagram for tubes (D-90 mm) made of 0.1 mm brass hard foil.
Gegenüber glatten Rohren ergibt sich daraus eine Festigkeitssteigerung um das 2-3fache, bei sehr tief gebildeten Waben sogar um das 15-facheO Bei Rohren mit kleinerem Durchmesser D ist die relative Festigkeitssteigerung etwas geringer, da dann die Eigenstabilität schon relativ groß ist.Compared to smooth pipes, this results in an increase in strength 2-3 times, with very deep honeycombs even 15 timesO for pipes with a smaller diameter D the relative increase in strength is somewhat lower, because then the inherent stability is already relatively large.
Ein Rohrstück wird an den Rohrenden fest eingespannt und in der Mitte punktförmig radial belastet. Figur 4 zeigt als Beispiel das Weg-Kraft-Diagramm für Rohre (D=55mm) aus 0,1mm Messing-Hart-Folie. Im Anfangsbereich resultiert daraus eine Festigkeitssteigerung um das 3,5fach , bei etwas tiefer gebildeten Waben um das 7fachen Das Minimum im Weg-Kraft-Diagramm für wabenverformte Rohre erklärt sich durch das plötzliche Einknicken eines Wabenabschnittes bei höheren Belastungen.A pipe section is firmly clamped at the pipe ends and in the middle radially loaded at points. As an example, FIG. 4 shows the displacement-force diagram for Tubes (D = 55mm) made of 0.1mm hard brass foil. This results in the initial area an increase in strength of 3.5 times, in the case of somewhat deeper honeycombs by 7 times the minimum in the displacement-force diagram for honeycomb-shaped pipes is explained due to the sudden buckling of a honeycomb section under higher loads.
Die ebenmäßige versetzte Wabenanordnung ermöglicht gute Strömungseigenschaften für Gase und Blüssigkeiten, die durch wabenverformte Rohre strömen. Strömungsversuche zeigten, daß die Grenzschicht in günstiger Weise durch die versetzte Wabenanordnung verändert wird und dadurch den Wärmeübergang verbessert.The evenly offset honeycomb arrangement enables good flow properties for gases and liquids flowing through honeycomb shaped tubes. Flow tests showed that the boundary layer benefited from the staggered honeycomb arrangement is changed and thereby improves the heat transfer.
Rohre mit sehr tiefen Waben und vergleichsweise geringem Durchmesser D können als Mischrohr zum Mischen verschiedener Flüssigkeiten oder Gase verwendet werden. Solche Rohre mit tiefer Wabenstruktur lassen sich gut aus Kunststoff (zum Beispiel PvC-Hart) herstellen.Pipes with very deep honeycombs and a comparatively small diameter D can be used as a mixing tube for mixing different liquids or gases will. Such pipes with a deep honeycomb structure can easily be made of plastic (for Example: PvC-Hart).
Werden wabenve#foxmte Rohre aus hochglanzpolierten Metallfolien oder aus beschichteten Kunststoffolien hergestellt und anschließend in axialer Richtung aufgeschnitten, so erhält man wabenverformte Hochglanzfolien, die einfallendes Licht gleichmäßig und breit streuen. Sie eignen sich als optische Reflektoren und zu Dekorationszwecken.Are honeycomb tubes made of highly polished metal foils or made of coated plastic films and then in the axial direction cut open, you get honeycomb-shaped high-gloss foils that absorb the incident light Spread evenly and widely. They are suitable as optical reflectors and for decorative purposes.
Die Herstellung wabenverformter Rohre oder zylindrischer Behälter kann auf verschiedene Weise erfolgen und richtet sich nach dem Verwendungszweck: Das bereits in Figur 1 erläuterte Herstellungsverfahren ist billig und eignet sich für kleine Stückzahlen0 Auf die inneren Stützringe oder auf die Stützspirale kann verzichtet werden, wenn stattdessen die Rohre mit kreisförmigen oder spiralförmigen Sicken versehen werden. Auch können stattdessen auf der Außenseite des Rohres aufgeschweißte Ringe oder Spiralen aus Rundmaterial oder Rippen verwendet werden. Hierdurch erhält man zum Beispiel Wärmeaustauscherrohre mit hoher Stabilität, die einen verbesserten Wärmeübergang innen durch die Waben und außen durch die vergrößerte Oberfläche besitzen0 Figur 5 zeigt ein haibkontinuierliches Herstellungsverfahren0 Eine Bandfolie 6 wird gebogen und in axialer Richtung zu einem glatten Rohr verschweißt. Das Rohr gelangt in die Druckkammer58 Der Stempel 7 besitzt eine spiralförmige Abstützvorrichtung.The manufacture of honeycomb shaped tubes or cylindrical containers can be done in different ways and depends on the intended use: The manufacturing process already explained in FIG. 1 is cheap and suitable for small quantities 0 on the inner support rings or on the support spiral can be omitted if instead the tubes are circular or spiral-shaped Beads are provided. They can also be welded onto the outside of the pipe instead Rings or spirals made of round material or ribs can be used. This gets For example, heat exchanger tubes with high stability, which provide an improved Have heat transfer inside through the honeycomb and outside through the enlarged surface 0 FIG. 5 shows a semi-continuous production process. A tape film 6 is made bent and welded in the axial direction to form a smooth tube. The pipe arrives into the pressure chamber 58 The punch 7 has a helical support device.
Die Druckkammer 5 wird durch 2 hydraulische Gummidichtungen 8, einen Spannring 9 und durch den Stützring 7a des Stempels 7 abgedichtet. Nach der Wabenverformung öffnen sich die Gummidichtungen 8 und der Spannring 9,und der nächstfolgende glatte Rohrabschnitt wird in die Druckkammer 5 geführt, während sich der Stempel 7 dreht, Figur 6 zeigt ein anderes halbkontinuierliches Herstellungsverfahren: Ein schmales Folienband wird schräg aufgewickelt und zu einem spiralförmigen Rohr verschweißt. Die Schweißnaht wird entweder dick ausgeführt, oder es wird zur Verstärkung zusätzlich eine Drahtspirale in der Schweißnaht verschweißt. Das spiralförmige Rohr wird in der Druckkammer 5 durch 2 breite hydraulische Gummidichtungen 11 abgedichtet, Nach der Wabenverformung öffnen sich die Gummidichtungen 11 und der nächstfolgende Rohrabschnitt wird in die Druckkammer 5 geführt, Figur 7 zeigt an einem Beispiel, wie 2 koaxiale Rohre in einfacher Weise mit Hilfe der Wabenverformung hergestellt werden können, Die auf das innere Rohr 12 aufgeschweißten Stützringe oder Stützapiralen 13 ( bzw. Rippen ) dienen für das äußere Rohr 14 als Abstützvorrichtung. Die Wabenverformung erfolgt in der Druckkammer 5, die wiederum durch 2 breite Gummidichtungen 11 abgedichtet wird, Diese koaxialen Rohre sind einfach herstellbar und besitzen eine hohe Festigkeit. Da die Rohre 12 und 14 nicht miteinander verschweißt sonden lediglich fest gegeneinander verspannt sind, besteht bei unterschiedlicher Wärmeausdehnung beider Rohre nicht die Gefahr einer Rißbildung. Daher sind derartige koaxiale Rohre zur Wärmeisolation oder als Wärm.austauscherrohre für 2 getrennte Medien zu verwenden. Wird statt der Stützspirale 13 ein dünnes spiralförmiges Stützrohr verwendet, kann durch dieses ein drittes Medium fließen (zum Beispiel zur Feinregelung des gesamten Wärmeübergangs)¢ L e e r s e ir s t eThe pressure chamber 5 is through 2 hydraulic rubber seals 8, one Clamping ring 9 and sealed by the support ring 7a of the punch 7. After the honeycomb deformation the rubber seals 8 and the clamping ring 9 open, and the next smooth one Pipe section is fed into the pressure chamber 5 while the punch 7 rotates, Figure 6 shows another semi-continuous manufacturing process: a narrow one Foil tape is wound up at an angle and welded to form a spiral tube. The weld is either made thick, or it becomes Reinforcement, a wire spiral welded in the weld seam. The spiral The pipe is sealed in the pressure chamber 5 by 2 wide hydraulic rubber seals 11, After the honeycomb deformation, the rubber seals 11 and the next one open Pipe section is led into the pressure chamber 5, Figure 7 shows an example, like 2 coaxial tubes made in a simple way with the help of honeycomb deformation The support rings or support spirals welded onto the inner tube 12 13 (or ribs) serve as a support device for the outer tube 14. The honeycomb deformation takes place in the pressure chamber 5, which in turn is sealed by 2 wide rubber seals 11 is, These coaxial tubes are easy to manufacture and have a high strength. Since the tubes 12 and 14 are not welded to one another, they only probe firmly against one another are tensioned, does not exist in the case of different thermal expansion of the two pipes the risk of cracking. Therefore, such coaxial pipes are used for thermal insulation or to be used as heat exchanger tubes for 2 separate media. Will instead of the Support spiral 13 uses a thin helical support tube, can through this a third medium flow (for example for fine control of the entire heat transfer) ¢ L. e e r s e ir s t e
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DE19752557215 DE2557215A1 (en) | 1975-12-19 | 1975-12-19 | Stiffening thin walled tubes - by applying external air pressure whilst internally supporting with spaced rings or spirals |
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DE19752557215 DE2557215A1 (en) | 1975-12-19 | 1975-12-19 | Stiffening thin walled tubes - by applying external air pressure whilst internally supporting with spaced rings or spirals |
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DE (1) | DE2557215A1 (en) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0523361A1 (en) * | 1991-07-16 | 1993-01-20 | Gesellschaft für Innenhochdruckverfahren mbH & Co.KG | Pipe with ribs and method for making the same |
AT396441B (en) * | 1991-05-21 | 1993-09-27 | Vaillant Gmbh | Method of producing a double-walled shaft |
DE4311978C1 (en) * | 1993-04-06 | 1994-04-21 | Frank Prof Dr Mirtsch | Forming dimples in thin sheet - by winding sheet on shaped support and deforming by fluid pressure |
WO1994022612A1 (en) * | 1993-04-06 | 1994-10-13 | Frank Mirtsch | Stiffening bulging |
DE4402295C1 (en) * | 1994-01-24 | 1995-10-12 | Intus Inst Fuer Technologie Un | Forming of surface of circular esp. thermoplastic containers |
WO1996000871A1 (en) * | 1994-06-29 | 1996-01-11 | Jochen Daume | Device for obtaining energy from sunlight with at least one solar collector |
DE19523723A1 (en) * | 1995-06-22 | 1997-01-09 | Udo Prof Dr Ing Hellwig | Flexible support core for shaping pipes - has alterable outlines for removal from the pipe after shaping operations |
EP0807582A1 (en) * | 1996-05-17 | 1997-11-19 | Schmalbach-Lubeca AG | Can with concavities in the body region |
WO1998020195A1 (en) * | 1996-11-02 | 1998-05-14 | Miele & Cie. Gmbh & Co. | Cylinder washing machine |
US6221299B1 (en) | 1996-04-18 | 2001-04-24 | Frank Mirtsch | Structuring process that stiffens and protects the surface of thin material webs |
DE10145079C1 (en) * | 2001-09-13 | 2002-10-10 | Miele & Cie | Drum, for washer-dryer, has casing surface at least partly provided with indentations in form of honeycomb curvature structure whose honeycomb surfaces face outside of drum |
DE19954027C2 (en) * | 1998-12-18 | 2003-01-23 | Miele & Cie | Device and method for producing dent-structured material webs |
DE19603974B4 (en) * | 1996-01-26 | 2004-05-19 | Udo Prof. Dr.-Ing. Hellwig | Process for deforming bodies and material webs |
DE10218144B4 (en) * | 2002-04-23 | 2007-10-04 | Dr. Mirtsch Gmbh | Textured container |
DE102009051603A1 (en) * | 2009-11-02 | 2011-06-16 | Dr. Mirtsch Gmbh | Method for producing multi-dimensionally structured pipe that is utilized as e.g. air-conditioning pipe in aircraft, involves forming multi-dimensional structures in wall with locally or nearly constant wall thickness |
DE10222736B4 (en) * | 2001-05-25 | 2014-03-20 | Boa Balg- Und Kompensatoren-Technologie Gmbh | Method and device for producing a thin-walled pipe element |
EP2873786A1 (en) | 2013-11-15 | 2015-05-20 | PWS GmbH | Double-walled large pipe, use and method of manufacturing a double-walled large pipe |
DE102013017644B4 (en) * | 2012-10-25 | 2017-09-21 | Dr. Mirtsch Gmbh | Method for producing a multi-dimensionally structured material web and use thereof |
-
1975
- 1975-12-19 DE DE19752557215 patent/DE2557215A1/en not_active Withdrawn
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT396441B (en) * | 1991-05-21 | 1993-09-27 | Vaillant Gmbh | Method of producing a double-walled shaft |
EP0523361A1 (en) * | 1991-07-16 | 1993-01-20 | Gesellschaft für Innenhochdruckverfahren mbH & Co.KG | Pipe with ribs and method for making the same |
DE4311978C1 (en) * | 1993-04-06 | 1994-04-21 | Frank Prof Dr Mirtsch | Forming dimples in thin sheet - by winding sheet on shaped support and deforming by fluid pressure |
WO1994022612A1 (en) * | 1993-04-06 | 1994-10-13 | Frank Mirtsch | Stiffening bulging |
DE4402295C1 (en) * | 1994-01-24 | 1995-10-12 | Intus Inst Fuer Technologie Un | Forming of surface of circular esp. thermoplastic containers |
WO1996000871A1 (en) * | 1994-06-29 | 1996-01-11 | Jochen Daume | Device for obtaining energy from sunlight with at least one solar collector |
DE19523723A1 (en) * | 1995-06-22 | 1997-01-09 | Udo Prof Dr Ing Hellwig | Flexible support core for shaping pipes - has alterable outlines for removal from the pipe after shaping operations |
DE19603974B4 (en) * | 1996-01-26 | 2004-05-19 | Udo Prof. Dr.-Ing. Hellwig | Process for deforming bodies and material webs |
US6221299B1 (en) | 1996-04-18 | 2001-04-24 | Frank Mirtsch | Structuring process that stiffens and protects the surface of thin material webs |
EP0807582A1 (en) * | 1996-05-17 | 1997-11-19 | Schmalbach-Lubeca AG | Can with concavities in the body region |
EP1118704A1 (en) * | 1996-11-02 | 2001-07-25 | Miele & Cie. GmbH & Co. | Drum washing machine |
US6334341B1 (en) | 1996-11-02 | 2002-01-01 | Miele & Cie. Gmbh & Co. | Cylinder washing machine |
WO1998020195A1 (en) * | 1996-11-02 | 1998-05-14 | Miele & Cie. Gmbh & Co. | Cylinder washing machine |
DE19954027C2 (en) * | 1998-12-18 | 2003-01-23 | Miele & Cie | Device and method for producing dent-structured material webs |
DE10222736B4 (en) * | 2001-05-25 | 2014-03-20 | Boa Balg- Und Kompensatoren-Technologie Gmbh | Method and device for producing a thin-walled pipe element |
DE10145079C1 (en) * | 2001-09-13 | 2002-10-10 | Miele & Cie | Drum, for washer-dryer, has casing surface at least partly provided with indentations in form of honeycomb curvature structure whose honeycomb surfaces face outside of drum |
DE10218144B4 (en) * | 2002-04-23 | 2007-10-04 | Dr. Mirtsch Gmbh | Textured container |
DE102009051603A1 (en) * | 2009-11-02 | 2011-06-16 | Dr. Mirtsch Gmbh | Method for producing multi-dimensionally structured pipe that is utilized as e.g. air-conditioning pipe in aircraft, involves forming multi-dimensional structures in wall with locally or nearly constant wall thickness |
DE102009051603B4 (en) * | 2009-11-02 | 2011-09-22 | Dr. Mirtsch Gmbh | A method of producing a structured pipe, structured product produced by the method and use thereof |
DE102013017644B4 (en) * | 2012-10-25 | 2017-09-21 | Dr. Mirtsch Gmbh | Method for producing a multi-dimensionally structured material web and use thereof |
EP2873786A1 (en) | 2013-11-15 | 2015-05-20 | PWS GmbH | Double-walled large pipe, use and method of manufacturing a double-walled large pipe |
DE102013019046A1 (en) | 2013-11-15 | 2015-05-21 | PWS GmbH | Double-walled large pipe, use of a large pipe and method for producing a double-walled large pipe |
DE102013019046B4 (en) * | 2013-11-15 | 2015-09-10 | PWS GmbH | Double-walled large pipe, use of a large pipe and method for producing a double-walled large pipe |
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Legal Events
Date | Code | Title | Description |
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8127 | New person/name/address of the applicant |
Owner name: MIRTSCH, FRANK, DIPL.-ING. DIPL.-PHYS. DR., 4250 B |
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8139 | Disposal/non-payment of the annual fee |