EP0099737A2 - Façonnage de rainures hélicoidales dans des tubes - Google Patents

Façonnage de rainures hélicoidales dans des tubes Download PDF

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Publication number
EP0099737A2
EP0099737A2 EP83304117A EP83304117A EP0099737A2 EP 0099737 A2 EP0099737 A2 EP 0099737A2 EP 83304117 A EP83304117 A EP 83304117A EP 83304117 A EP83304117 A EP 83304117A EP 0099737 A2 EP0099737 A2 EP 0099737A2
Authority
EP
European Patent Office
Prior art keywords
roller
tubular element
tube
groove
shoe
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.)
Withdrawn
Application number
EP83304117A
Other languages
German (de)
English (en)
Other versions
EP0099737A3 (fr
Inventor
Ronald Albert Pain
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.)
Heat Transfer Pty Ltd
Original Assignee
Heat Transfer Pty Ltd
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 Heat Transfer Pty Ltd filed Critical Heat Transfer Pty Ltd
Publication of EP0099737A2 publication Critical patent/EP0099737A2/fr
Publication of EP0099737A3 publication Critical patent/EP0099737A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • This invention relates to a method and apparatus for forming helical grooves in the outer surfaces of metallic tubes. Such tubes are useful in heat exchangers of the type disclosed in Australian Patent No. 402788.
  • One technique for forming the helical grooves involves providing a die which is preferably stationary and arranging for the tube to be moved longitudinally through the die whilst simultaneously being rotated.
  • the die includes a roller which is forced radially inwardly so as to engage and deform the outer surface of the tube so as to form the helical groove as the tube is drawn through the die. It is possible to support the interior surface of the tube by means of a mandrel but this is cumbersome when long tubes are to be grooved. Further,difficulties are encountered when welded tubes are used since frequently these have a weld bead remaining on their internal surface and this interferes with the mandrel. It is therefore usually most convenient to have the inner surface of the tube unsupported in the die.
  • the die includes a circular opening which is the same as the outer diameter of the tube so as to have a snug fit therewith, the circular opening supporting the tube during the deformation process. Whilst this technique is reasonably satisfactory, it makes the tube more difficult to pass through the die because of the snug fit. Further, problems may occur where the tube departs from its nominal outer diameter and thus can be too tight in the die or alternatively to slack in the die. In the latter case, there is a tendency for the tube to buckle just after having the groove formed therein, the buckled tube remaining plastically deformed and quite useless for use in a heat exchanger. It is thought that the tendency to buckle is related to the slackness in the die and also is more prone to occur when deeper grooves are impressed into the tube. The characteristics of the buckling are also thought to be related to the tube diameter and tube thickness, and generally speaking, the buckling tends to occur closer to the point of contact of the forming roller in smaller diameter tubes and further from the point of contact in larger diameter tubes.
  • An object of the present invention is to provide a new method and apparatus for forming helical grooves in tubes which substantially avoid the problem of buckling as indicated above.
  • a method of forming a helical groove on the outer surface of a tubular element comprising thesteps of causing simultaneous axial and circumferential relative velocity between the tubular element and a forming roller, supporting in a die the outer surface only of the tubular element adjacent to the forming roller, and applying a generally inwardly radial force to said tubular element in or adjacent to the groove formed therein at a predeteremined spacing from the roller.
  • the invention also provides apparatus for forming a helical groove in a tubular element, said apparatus comprising a die having a forming roller and a support for supporting the outer periphery of the tubular element, said apparatus including means for causing simultaneous, axial and circumferential relative velocity between the die and the roller whereby the forming roller depresses a helical groove into the outer surface of the tubular element as it passes through the die, said apparatus being characterized by the provision of a force applying member which applies a force having radially inwardly directed components relative to the tubular element, said force being applied in or adjacent to said groove at a predetermined spacing from the forming roller.
  • Figure 1 illustrates a stainless steel tube 2 passing through a forming die 4 for forming a helical groove 6 on the tube.
  • the die 4 is stationary and the tube 2 is moved axially through the die whilst simultaneously being rotated.
  • the mechanism for causing rotation and axial movement of the tube is not shown. It may however simply comprise an arrangement which is similar to a gear cutting lathe with the end of the tube being mounted in the chuck of the lathe, the chuck being rotated'and moved axially along the bed of the lathe.
  • the die comprises a supporting plate 8 which is stationary with respect to the bed (not shown) of the apparatus.
  • a cylindrical tube support cylinder 10 is carried by the plate 8, the support cylinder 10 having an internal cylindrical surface 12 which snuggly engages the outer surface of the tube 2.
  • the cylinder 10 includes an opening 14 which provides access for a forming roller 16 which bears against the outer surface of the tube 6.
  • the roller 16 is carried by a yoke 18 the position of which is controlled by a pressure applying member 20 which may comprise the push rod of an hydraulic or pneumatic ram mounted on the plate 8.
  • the member 20 may comprise the lower end of a screw threaded member which passes through a threaded nut affixed to the plate 8.
  • the axis of the roller 16 is inclined relative to the axis of the tube 2 such that the axis of the roller is transverse to the direction of the groove 6 at the point of contact with the tube.
  • the force has substantial radial components relative to the tube 2 and will also have significant tangential components due to frictional contact with the tube.
  • the member 22 may comprise a roller but best results have been obtained with the use of a hardened polished shoe having a lower surface 24 which is of complementary configuration to the profile of the groove 6, as best seen in Figure 3.
  • the member 22 is preferably carried by an arm 6 which is pivotally mounted on a shaft 8 projecting from the plate 8.
  • the pivotal axis of the arm 26 is parallel to the axis of rotation of the roller 16.
  • the radially inwardly directed force transmitted via the shoe is determined by means of a force applying member 30 which is generally radially directed relative to the tube 2 and bears against the upper face of the arm 26.
  • the member 30 may comprise the push rod of an hydraulic or pneumatic ram mounted on the support plate 8 or alternatively may comprise a purely mechanical member extending from the plate 8.
  • the arrangement' is such that the circumferentially directed forces generated by the contact of the shoe with the tube are taken by the arm 26 so that these forces are not transmitted to the force applying member 30.
  • the spacing of the shoe relative to the roller 16 depends to some extent upon the diameter of the tube being grooved, the larger the tube, the bigger the spacing. Further, the optimum spacing depends also on the clearance between the outer surface of the tube and the inner surface 12 of the cylinder 10, the bigger the gap the further should be the spacing between the shoe and the roller. Still further, the spacing depends on the depth of the groove being formed, the deeper the groove, the larger the spacing between the shoe and the roller. It is preferred therefore that the apparatus be adjustable so as to give optimum results. It is thought however that the force applying member 22 should be spaced through between say 30° and 60° relative to the roller as seen axially of the tube (0.4445 to 0.508 cm).
  • a prototype of the invention has been tested and found to perform satisfactorily with groove depths of up to 0.175 to 0.200 inches.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Catalysts (AREA)
  • Metal Extraction Processes (AREA)
EP83304117A 1982-07-15 1983-07-15 Façonnage de rainures hélicoidales dans des tubes Withdrawn EP0099737A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU488382 1982-07-15
AU4883/82 1982-07-15

Publications (2)

Publication Number Publication Date
EP0099737A2 true EP0099737A2 (fr) 1984-02-01
EP0099737A3 EP0099737A3 (fr) 1985-05-22

Family

ID=3695331

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83304117A Withdrawn EP0099737A3 (fr) 1982-07-15 1983-07-15 Façonnage de rainures hélicoidales dans des tubes

Country Status (2)

Country Link
EP (1) EP0099737A3 (fr)
AU (1) AU1690083A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0274719A3 (en) * 1987-01-13 1989-12-20 Gd-Anker Gmbh Thread-forming method and tubular body provided with a thread
DE10126399A1 (de) * 2001-05-31 2002-12-05 Nexans France S A Vorrichtung zur kontinuierlichen Herstellung eines schraubenlinienförmig gewellten Metallrohres
EP1407939A1 (fr) * 2002-10-10 2004-04-14 COMAU S.p.A. Amortisseur de choc pour véhicule
CN100384582C (zh) * 2004-08-31 2008-04-30 锦州秀亭制管有限公司 薄壁不锈钢凹槽螺旋管的制造方法及成型装置
US9669499B2 (en) 2004-11-09 2017-06-06 Denso Corporation Double-wall pipe, method of manufacturing the same and refrigerant cycle device provided with the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US436463A (en) * 1890-09-16 Dolph
GB896163A (en) * 1959-10-07 1962-05-09 Ass Elect Ind Improvements in or relating to the manufacture of cable sheaths or the like
US3928997A (en) * 1975-03-28 1975-12-30 Olin Corp Method and apparatus for producing corrugated tubing

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0274719A3 (en) * 1987-01-13 1989-12-20 Gd-Anker Gmbh Thread-forming method and tubular body provided with a thread
DE10126399A1 (de) * 2001-05-31 2002-12-05 Nexans France S A Vorrichtung zur kontinuierlichen Herstellung eines schraubenlinienförmig gewellten Metallrohres
EP1407939A1 (fr) * 2002-10-10 2004-04-14 COMAU S.p.A. Amortisseur de choc pour véhicule
CN100384582C (zh) * 2004-08-31 2008-04-30 锦州秀亭制管有限公司 薄壁不锈钢凹槽螺旋管的制造方法及成型装置
US9669499B2 (en) 2004-11-09 2017-06-06 Denso Corporation Double-wall pipe, method of manufacturing the same and refrigerant cycle device provided with the same

Also Published As

Publication number Publication date
EP0099737A3 (fr) 1985-05-22
AU1690083A (en) 1984-01-19

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Effective date: 19860123

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Inventor name: PAIN, RONALD ALBERT