EP0000369A1 - Tube métallique à paroi mince, procédé de fabrication, et son utilisation - Google Patents

Tube métallique à paroi mince, procédé de fabrication, et son utilisation Download PDF

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Publication number
EP0000369A1
EP0000369A1 EP78100304A EP78100304A EP0000369A1 EP 0000369 A1 EP0000369 A1 EP 0000369A1 EP 78100304 A EP78100304 A EP 78100304A EP 78100304 A EP78100304 A EP 78100304A EP 0000369 A1 EP0000369 A1 EP 0000369A1
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EP
European Patent Office
Prior art keywords
tube
wire
coil
metal
gap
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
EP78100304A
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German (de)
English (en)
Other versions
EP0000369B1 (fr
Inventor
Richard Dr. Bleckmann
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.)
ELPAG AG CHUR
Original Assignee
ELPAG AG CHUR
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 ELPAG AG CHUR filed Critical ELPAG AG CHUR
Publication of EP0000369A1 publication Critical patent/EP0000369A1/fr
Application granted granted Critical
Publication of EP0000369B1 publication Critical patent/EP0000369B1/fr
Expired legal-status Critical Current

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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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/34—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely
    • F28F1/36—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending obliquely the means being helically wound fins or wire spirals
    • 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
    • B21C37/08—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, 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
    • B21C37/22—Making finned or ribbed tubes by fixing strip or like material to tubes
    • B21C37/26—Making finned or ribbed tubes by fixing strip or like material to tubes helically-ribbed tubes
    • 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
    • Y10T29/49881—Assembling or joining of separate helix [e.g., screw thread]

Definitions

  • the invention relates to a thin-walled metal pipe, in particular for condensers of refrigeration devices, for the brake fluid in motor vehicles, as a jacket pipe for electric tubular heaters and for air heaters with low-pressure steam, from a metal strip bent transversely to its longitudinal axis, the edge regions of which are connected to one another and with a wire or Band is wound in a spiral shape, as well as a process for its production.
  • Such metal pipes are known from DE-PS 524 552 and are produced by continuously running a metal strip through forming rolls which form a slotted pipe. Then the edges of the tape are welded together.
  • the wall thickness of the tube that is to say the thickness of the metal strip used as the starting product, is matched to the radial pressure occurring in use.
  • the axial load on the tube is generally not critical, ie the strength of the tube under internal pressure is in the longitudinal direction of the tube only half as large as in the tangential direction.
  • the longitudinal edges of the strip must be pressed against one another so strongly by shaping rolls that the contact is permanent, i.e. H. "Popping open" of the slotted tube is to be prevented.
  • H. "Popping open" of the slotted tube is to be prevented.
  • the band must therefore be wider than the circumference of the pipe to be manufactured in order to compensate for the reduction in circumference that occurs due to the compression.
  • the degree of compression for strips made of unalloyed steel is about 5%.
  • changes in the soldering gap occur under the influence of heat during soldering, which impair the quality of the soldering.
  • a slot is created that is relatively wide, e.g. B. with a width of 0, 2 - 0, 3 mm with a strip with a thickness of 0.5 mm made of unalloyed steel.
  • such a slot does not have the capillary action required to draw in a solder.
  • seamless tubes are also known.
  • a copper tube is produced using the extrusion process, which is then drawn to the desired diameter and the desired wall thickness.
  • These pipes are relatively expensive.
  • a saving of over 30% compared to this type of seamless tubes is achieved.
  • tubes manufactured by the so-called bundy method are known.
  • an unalloyed steel strip which is approximately twice as wide as the circumference of the pipe to be manufactured, is galvanically copper-plated.
  • the steel band is then in Formed into a double spiral, ie the wall thickness of the finished pipe is twice the wall thickness of the starting strip.
  • soldering in a soldering furnace, the galvanically applied copper serving as the soldering material.
  • the tube is then drawn cold in general and optionally soft annealed again.
  • the advantage of the bundy pipes manufactured in this way compared to welded pipes is their absolute tightness and thus safety.
  • these tubes are relatively expensive, due to the galvanic copper plating and the complex manufacturing process.
  • the wall thickness of the finished pipe is twice as large as the thickness of the steel strip serving as the starting material, so that pipes with very small wall thicknesses cannot be produced.
  • the invention is based on the object of proposing a new method for producing thin-walled metal pipes, in which a high degree of safety with regard to the tightness of the pipe and a higher load-bearing capacity of the pipe against radial stress can be achieved. Furthermore, depending on the intended use of the tube, special advantages can be achieved, as will be described below.
  • the method according to the invention differs from such manufacturing methods in that a wire or a coil is wound in a spiral shape on the semi-finished product. ie before the edge areas of the strip serving as the starting product are connected to one another.
  • a defined seam gap can be achieved by the helical winding with a certain pre-tensioning of the band or wire, without the band being compressed by the forming rollers.
  • the seam gap has the capillary action required for soldering.
  • a thin copper foil for example 3 mm wide and 0.1 mm thick, can now be put on before winding up the wire helix.
  • the copper foil serving as solder is held by the wire helix.
  • the semi-finished product thus produced is heated in a soldering oven until the copper foil melts, then the molten copper is drawn into the gap under the capillary action, so that the tube is closed cleanly and durable after cooling.
  • the main advantages of this manufacturing process lie in the achievement of an exact capillary gap, in the exact metering of the solder material and in the fact that the solder material is held firmly at the desired location by the wire helix. It is also guaranteed that there are no undesirable changes in the soldering gap due to the heat in the soldering furnace.
  • the helix can be unwound after the gap has been closed and rewound onto a new tube section.
  • the prerequisite for this is the use of a spiral wire that does not bind with the appropriate solder, e.g. B. a spiral made of stainless steel is used in the manufacture of an unalloyed steel pipe with copper as solder.
  • a spiral made of stainless steel is used in the manufacture of an unalloyed steel pipe with copper as solder.
  • the radial pressure load of a pipe manufactured in this way is significantly higher than that of a conventional pipe.
  • the heat-emitting surface can easily be doubled with a corresponding slope of the coil.
  • the tubular heater can be shortened by at least a third. Apart from the significant reduction in price, this is too take into account that the space available for the tubular heater is limited in most household appliances. If the space is fully used, the device can be operated with higher nominal powers, so that heating times are shorter.
  • Another possibility of fastening the pipes is that the pipe is pressed onto the holding plate or onto the shaped body in a press.
  • the adjacent spiral sections penetrate vertically into the material of the holding plate.
  • the material must move sideways, ie in the axial direction of the tube, and is pressed in behind the largest cross-section of the adjacent wire spiral section. In this way there is an anchoring effect achieved.
  • the pressed-on pipes cannot be detached from the holding plate even when large forces are applied.
  • the soldered helix can also be used for fastening in another way, since it is practically a tube with a soldered thread. Should such a tube z. B. are attached to a container wall, then only two special nuts are required, which have a matching internal thread to the soldered coil. If at least one of these nuts is conical, then a rubber ring can be inserted into the cone, which is enclosed by the cone, the tube and the container wall and enables a sealed passage. If two such pipes are to be connected to one another, this can be done with the aid of a sleeve with a continuous thread. The pipes to be connected must be turned against each other. If this is not possible, then a pipe with a right-handed helix must be connected to a pipe with a left-handed helix by means of a sleeve with left-hand and right-hand threads.
  • a band of oxygen-free copper with a thickness of 0.5 mm is bent by means of forming rolls to form a slotted tube with an 8 mm diameter.
  • a copper wire with a 1 mm diameter is wound helically onto the slotted tube, the pitch being 2 mm.
  • a band of copper solder 3 mm wide and 0.1 mm thick is inserted between the helix and the slotted tube.
  • the pipe is then optionally in the continuous pass heated in a soldering furnace, the melting copper solder flowing into the gap of the slotted tube and closing it due to the capillary action.
  • the coil is soldered to the tube.
  • the tube would have a surface area of 250 mm 2 per cm length.
  • the surface of the wound wire is 450 mm 2 per cm of tube length. Assuming a solder width of 0.2 mm, 60 mm 2 are to be subtracted from this for the soldering point. The surface of the tube is thus increased from 250 mm 2 per cm to 640 mm 2 by the coil.
  • a further increase in the surface area can be achieved if the wound wire is rolled flat while rotating the tube.
  • Condensers i.e. capacitors of refrigerators, consist of an unalloyed steel tube, which is bent in a meandering shape and to which wires or sheet metal ribs made of unalloyed steel, spaced apart to enlarge the surface, are attached in a heat-conducting manner across the meandering windings.
  • the entire structure is hot-dip galvanized and then painted. Inside there is an operating pressure of max. about 16 atü and accordingly the tube must be dimensioned.
  • a strip of unalloyed steel with a thickness of 0.5 mm is bent in forming rolls to form a slotted tube with an outer diameter of 6 mm.
  • a wire made of copper-plated, unalloyed steel with a diameter of 1.2 mm is wound helically with a pitch of 2.2 mm onto the slotted tube. At the same time it becomes a copper tape of 7 mm width and 0.1 mm thickness inserted between the helix and the slotted tube.
  • the tube is then optionally heated in a continuous pass in a soldering furnace, the melted copper flowing out of the copper strip into the gap in the slot tube due to the capillary action and closing it.
  • the coil is soldered to the tube and, due to the excess solder, coppering is achieved, which serves as protection against corrosion.
  • a galvanically copper-plated steel wire ie a so-called staple wire, instead of bare, unalloyed steel wire for the wound coil.
  • the pipe thus produced is e.g. bent in a meandering shape and the evaporator is finished.
  • the tube length is reduced by about a quarter due to the particularly favorable heat-emitting surface with the same effect, which is associated with a substantial saving in material.
  • a further saving results from the fact that the tube wall thickness can be kept smaller, since the tube is more resistant to the internal overpressure in the tangential direction due to the wound coil.
  • a spiral tube which is produced exactly as described in Example 2, but with a spiral wire diameter of 0.8 mm, is used as the jacket tube of an electric tubular heater. After centering the heating coil, the remaining space inside the tube is filled with magnesium oxide under vibration. For pre-compression, the tube is then pressed flat and bent into an annular shape. The pipe bent in this way is inserted into a die sets and pressed against the bottom of a fat baking device made of aluminum with a pressure of 5 t per cm 2 . The adjacent spiral sections penetrate vertically into the aluminum floor panel; the aluminum flows in the axial direction of the tubular heater and is pressed in behind the largest cross-section of the adjacent wire coil section. In this way, an anchoring effect is achieved, so that the pressed-on tubular heating element cannot be detached from the aluminum floor even when large forces are applied.
  • the bottom of the fat baking device has an outer diameter of 220 mm
  • the tubular tubular heater has an average diameter of 180 mm and a total length of 450 mm.
  • the tube jacket is made of unalloyed steel with a wall thickness of 0.5 mm
  • the helix wire is also made of unalloyed steel with a diameter of 0.6 mm
  • the helix pitch is 2 mm.
  • the outer diameter of the tube, without taking the helix into account, is 8 mm.
  • the pressing tool has a semicircular profile. After pressing on with a pressure of 220 t, the surface in contact with the aluminum floor is flat, the tube has a width of 9 mm there.
  • Panel radiators for electrical space heating are in most cases equipped with heating elements in the form of U-shaped tubular heating elements. These lie between two sheet metal plates forming the housing and give off the heat to them by radiation. Unalloyed steel is used as the pipe material for cost reasons. However, this is only possible up to an output of approximately 500 W per tubular heating element, because at higher outputs the AC humming noise becomes so strong that this disturbs. Tubular radiators with non-magnetic austenitic chrome-nickel steel sheaths must be used for higher outputs, which are more expensive.
  • a slot tube with an outer diameter of 8 mm is now produced from an unalloyed steel strip with a thickness of 0.4 mm in form rollers.
  • a wire made of chromium steel with 18% chromium with a diameter of 0.3 mm is wound helically with a pitch of 4 mm onto the slotted tube.
  • a copper strip 2 mm wide and 0.1 mm thick is inserted between the helix and the slotted tube.
  • the tube is then optionally heated in a continuous pass in a soldering furnace, the melted copper flowing out of the copper strip into the gap in the slot tube due to the capillary action and closing it.
  • a spiral tube which is produced in the same way as described in Example 2, but with a spiral wire diameter of 0.5 mm and a pitch of 3 mm and a copper bandwidth of 5 mm, serves as a delivery tube for the brake fluid of motor vehicles.
  • steel pipes alternate with hoses made of rubber, plastic or the like.
  • the hose end is pushed onto the pipe end and fastened with a hose tie.
  • this transition point is absolutely tight despite the soldered-on helix, and it has the advantage even over a smooth tube that it is not possible to pull the hose off the tube because of the anchoring effect of the helix as long as the hose tie is tightened.
  • a metal strip 1, z. B. made of unalloyed steel, bent to form a slotted tube by form rolling.
  • a copper strip 3 is placed on the slotted tube in the vicinity of the gap 2.
  • a wire made of copper-plated unalloyed steel is wound helically under prestress, so that a wire coil 4 is formed.
  • the gap 2 is a capillary gap. For reasons of clarity, it is wider in the drawing than is shown in reality.
  • the edges areas 5 of the metal strip 1 angled vertically.
  • the mutually opposite surfaces of the edge areas 5 are pressed together by the wire helix 4, not shown. This creates a deeper gap 2 with a correspondingly increased strength of the seam connection.
  • a metal strip can be used which is considerably wider than the diameter of the tube to be produced.
  • the edge regions of the tube are angled twice at 6 and 7, so that on the one hand a gap 2 of the desired depth is formed, but on the other hand lobes 8 are formed which extend far into the interior of the tube.
  • the lobes 8 cause the medium to flow through in a laminar flow kept and accordingly turbulence avoided.
  • the heat transfer to the outer surface of the tube is significantly increased.
  • the embodiment shown in FIG. 3 is also particularly advantageous in fields of application in which heat is to be transferred inwards from the outer surface of the tube, e.g. B. if a poorly heat-conducting liquid is conveyed inside the tube, which is to be heated.
  • heat is to be transferred inwards from the outer surface of the tube, e.g. B. if a poorly heat-conducting liquid is conveyed inside the tube, which is to be heated.
  • the response speed can be significantly improved by the protruding into the tube lugs 8.
  • the cooling of flowing media is also significantly improved.
  • the inner edge area still strives to bend slightly.
  • the outer edge area is pressed onto the inner edge area by the helix 4, not shown.
  • a defined capillary gap is also formed in this way.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • General Induction Heating (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
EP78100304A 1977-07-08 1978-07-05 Tube métallique à paroi mince, procédé de fabrication, et son utilisation Expired EP0000369B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2731027 1977-07-08
DE2731027A DE2731027C2 (de) 1977-07-08 1977-07-08 Verfahren zur Herstellung von dünnwandigen Metallrohren

Publications (2)

Publication Number Publication Date
EP0000369A1 true EP0000369A1 (fr) 1979-01-24
EP0000369B1 EP0000369B1 (fr) 1980-10-01

Family

ID=6013514

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78100304A Expired EP0000369B1 (fr) 1977-07-08 1978-07-05 Tube métallique à paroi mince, procédé de fabrication, et son utilisation

Country Status (5)

Country Link
US (1) US4251907A (fr)
EP (1) EP0000369B1 (fr)
AT (1) ATA489478A (fr)
DE (2) DE2731027C2 (fr)
IT (1) IT7825233A0 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004580A3 (en) * 1978-04-04 1979-10-31 Elpag Ag Chur Heat exchange element and method for its manufacture
EP0031422A1 (fr) * 1979-11-09 1981-07-08 Elpag Ag Chur Dispositif pour la fabrication de tubes d'une longueur prédéterminée
EP0031866A1 (fr) * 1980-01-08 1981-07-15 Elpag Ag Chur Procédé pour la fabrication d'un appareil de chauffage ou d'un élément échangeur de chaleur
WO1994017355A1 (fr) * 1993-01-23 1994-08-04 Klaus Lorenz Dispostif echangeur de chaleur et procede de transfert thermique

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062691A1 (fr) * 1981-04-15 1982-10-20 Elpag Ag Chur Echangeur de chaleur
NL9000723A (nl) * 1990-03-27 1991-10-16 Verolme Maschf Ijsselmonde B V Werkwijze voor het vervaardigen van een samengestelde pijp.
US5732874A (en) * 1993-06-24 1998-03-31 The Idod Trust Method of forming seamed metal tube
JPH1191352A (ja) * 1997-09-24 1999-04-06 Sanyo Mach Works Ltd インパクトバーおよびその製造方法
US6098666A (en) * 1999-01-13 2000-08-08 Parker-Hannifin Corporation Dual coil tubing assembly
US6530514B2 (en) * 2001-06-28 2003-03-11 Outokumpu Oyj Method of manufacturing heat transfer tubes
US6758418B2 (en) * 2001-08-07 2004-07-06 Nordson Corporation Swirl gun
DE60311592T2 (de) * 2002-11-26 2007-11-15 Parker-Hannifin Corp., Cleveland Röhrenförmige polymerzusammensetzungen für röhren und schlauchkonstruktionen
US20060280889A1 (en) * 2005-06-10 2006-12-14 Powell Steven M Tubular nylon alloy members for tubing and hose constructions
US9669593B2 (en) * 2007-06-14 2017-06-06 The Boeing Company Light weight thermoplastic flex foam and hybrid duct system
US10040127B2 (en) * 2014-03-14 2018-08-07 Kennametal Inc. Boring bar with improved stiffness
SE540857C2 (en) 2017-02-03 2018-12-04 Valmet Oy Heat transfer tube and method for manufacturing a heat transfer tube
CN111971436A (zh) * 2018-04-06 2020-11-20 Vsl国际股份公司 设有施压器件的用于拉索的管和方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE97510C (fr) *
DE524552C (de) * 1927-04-27 1931-05-08 Bundy Tubing Co Verfahren zur Herstellung von Rippenrohren
US1823919A (en) * 1929-03-28 1931-09-22 Frigidaire Corp Refrigerating apparatus
US1882151A (en) * 1930-11-03 1932-10-11 Horton Mfg Co Inc Method of making alpha golf shaft
US2074987A (en) * 1932-10-08 1937-03-23 Horton Mfg Co Inc Welded sheet metal golf shaft and method of making the same
FR1181855A (fr) * 1956-09-13 1959-06-19 Bundy Tubing Co Tuyau pour haute pression et son procédé de fabrication
CH341520A (de) * 1955-01-21 1959-10-15 Morris Motors Ltd Verfahren zur Herstellung von Flachrohren aus Aluminium oder einer Leichtmetallegierung für Röhren-Wärmeaustauschern
DE1100118B (de) * 1958-10-21 1961-02-23 Siemens Ag Verfahren zur Herstellung von koaxialen Hochfrequenzleitungen und elektrischen Kabeln mit einem gerillten Aussenleiter bzw. metallenen Kabelmantel
DE1652577A1 (de) * 1968-03-16 1971-04-01 Wolfgang Heinrich Verfahren zur Herstellung eines Rohres fuer hohe Innendruckbelastung

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Publication number Priority date Publication date Assignee Title
US1472518A (en) * 1923-10-30 Hew yoek
US886616A (en) * 1908-01-20 1908-05-05 Philip H Long Method of making bracelets.
US1286388A (en) * 1917-12-19 1918-12-03 Joseph J Mulconroy High-pressure hose-coupling.
US1978235A (en) * 1933-09-21 1934-10-23 Myron C Summers Method of making butt-welded tubes
US2196708A (en) * 1936-10-26 1940-04-09 Standard Products Co Reinforced thin wall tubing
US2208706A (en) * 1939-01-04 1940-07-23 Raphael M Spencer Hose clamp
US2522684A (en) * 1946-02-16 1950-09-19 Independent Pneumatic Tool Co Hose securing means

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE97510C (fr) *
DE524552C (de) * 1927-04-27 1931-05-08 Bundy Tubing Co Verfahren zur Herstellung von Rippenrohren
US1823919A (en) * 1929-03-28 1931-09-22 Frigidaire Corp Refrigerating apparatus
US1882151A (en) * 1930-11-03 1932-10-11 Horton Mfg Co Inc Method of making alpha golf shaft
US2074987A (en) * 1932-10-08 1937-03-23 Horton Mfg Co Inc Welded sheet metal golf shaft and method of making the same
CH341520A (de) * 1955-01-21 1959-10-15 Morris Motors Ltd Verfahren zur Herstellung von Flachrohren aus Aluminium oder einer Leichtmetallegierung für Röhren-Wärmeaustauschern
FR1181855A (fr) * 1956-09-13 1959-06-19 Bundy Tubing Co Tuyau pour haute pression et son procédé de fabrication
DE1100118B (de) * 1958-10-21 1961-02-23 Siemens Ag Verfahren zur Herstellung von koaxialen Hochfrequenzleitungen und elektrischen Kabeln mit einem gerillten Aussenleiter bzw. metallenen Kabelmantel
DE1652577A1 (de) * 1968-03-16 1971-04-01 Wolfgang Heinrich Verfahren zur Herstellung eines Rohres fuer hohe Innendruckbelastung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004580A3 (en) * 1978-04-04 1979-10-31 Elpag Ag Chur Heat exchange element and method for its manufacture
EP0031422A1 (fr) * 1979-11-09 1981-07-08 Elpag Ag Chur Dispositif pour la fabrication de tubes d'une longueur prédéterminée
EP0031866A1 (fr) * 1980-01-08 1981-07-15 Elpag Ag Chur Procédé pour la fabrication d'un appareil de chauffage ou d'un élément échangeur de chaleur
WO1994017355A1 (fr) * 1993-01-23 1994-08-04 Klaus Lorenz Dispostif echangeur de chaleur et procede de transfert thermique

Also Published As

Publication number Publication date
ATA489478A (de) 1982-07-15
IT7825233A0 (it) 1978-06-30
US4251907A (en) 1981-02-24
DE2860190D1 (en) 1981-01-08
EP0000369B1 (fr) 1980-10-01
DE2731027C2 (de) 1979-07-12
DE2731027B1 (de) 1978-11-09

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