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WO1991016156A1 - Conduit tronconique - Google Patents

Conduit tronconique Download PDF

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Publication number
WO1991016156A1
WO1991016156A1 PCT/AU1991/000140 AU9100140W WO9116156A1 WO 1991016156 A1 WO1991016156 A1 WO 1991016156A1 AU 9100140 W AU9100140 W AU 9100140W WO 9116156 A1 WO9116156 A1 WO 9116156A1
Authority
WO
WIPO (PCT)
Prior art keywords
conduit
longitudinal
primary
tapered
support block
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.)
Ceased
Application number
PCT/AU1991/000140
Other languages
English (en)
Inventor
Paul Cooper
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.)
DIE-CRAFT ENGINEERING PTY Ltd
Original Assignee
DIE-CRAFT ENGINEERING 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 DIE-CRAFT ENGINEERING PTY Ltd filed Critical DIE-CRAFT ENGINEERING PTY Ltd
Publication of WO1991016156A1 publication Critical patent/WO1991016156A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B21D51/00—Making hollow objects
    • B21D51/02—Making hollow objects characterised by the structure of the objects
    • B21D51/10—Making hollow objects characterised by the structure of the objects conically or cylindrically shaped objects
    • 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
    • B21C37/155—Making tubes with non-circular section
    • 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
    • B21C37/16—Making tubes with varying diameter in longitudinal direction
    • B21C37/18—Making tubes with varying diameter in longitudinal direction conical tubes
    • B21C37/185—Making tubes with varying diameter in longitudinal direction conical tubes starting from sheet material
    • 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
    • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
    • B21D17/04—Forming single grooves in sheet metal or tubular or hollow articles by rolling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/003—Rigid pipes with a rectangular cross-section

Definitions

  • THIS INVENTION relates to metal conduits e.g. tubular metal pipe or tube.
  • Conduits to which the invention relates are generally intended for liquid transfer such as downpipes associated with guttering.
  • the conduits may be used for other purposes unconnected with liquids or liquid transfer. Accordingly, the term "conduit" is used in this specification to cover hollow metal members for all such purposes.
  • the invention is particularl concerned with metal conduit having a relatively thin continuous wall be it round or rectangular and having a thickness for example of from 0.3mm to 1.0mm and more specifically from 0.4mm to 0.6mm.
  • tapered conduit has been formed by roll-forming a flat tapered (generally trapezoidal) sheet around a tapered mandrel. Examples of such method are disclosed in Australian Patent Specifications 38151/89, 273529, 403577 and 412312. Of these specifications 403577 is considered to be the most relevant to the present invention in that it discloses rectangular downpipe formed from sheet metal and tapered so that the smaller end of section will fit into an adjacent larger end of another similar section.
  • the taper is achieved by deformation of a lock seam attaching adjacent ends of the sheet metal so that it is displaced inwardly from one end to the other so that at the larger end the lock seam projects outwardly of the downpipe and at the smaller end the lock seam projects inwardly of the downpipe leaving the outer surface substantially flat at the smaller end.
  • tapered conduit has involved the production of conduit of uniform cross-sectional shape and area usually by roll-forming and subsequently grooving or corrugating the perimeter of the conduit with longitudinally tapering grooves to produce a longitudinal taper along the length of the conduit.
  • Examples of such method and conduit are disclosed in Australian Patent Specifications 563694, 244067 and French Patent Specification 1.260.814.
  • the present invention provides an improved tapered conduit over prior tapered conduits, a new method of producing tapered conduit and also a new apparatus for producing tapered conduit.
  • the invention provides tapered conduit suitable for downpipe having a smaller end in transverse dimension and a larger end in transverse dimension which includes a longitudinal formation characterized in that there is provided a pair of adjacent longitudinal deformations each having a substantially uniform taper from end to end and wherein each longitudinal deformation is located with the longitudinal formation interposed therebetween to facilitate interfitting of adjacent similar sections of the tapered conduit with the smaller end of one section being insertable in the larger end of the other section.
  • the tapered conduit of the invention may have any suitable cross-sectional shape and thus comprise a circular shape, square shape, rectangular shape or polygonal shape for example.
  • the invention is particularly concerned with circular shape conduit and rectangular conduit.
  • the longitudinal formation may comprise for example a corner edge or jointing seam of the • conduit which may be part of the conventional structure of the conduit.
  • a jointing seam such as a lock seam, welded seam or even a seam interconnected by fasteners (eg rivets) is a suitable example of a longitudinal formation.
  • a corner edge is a suitable example of a longitudinal formation.
  • the adjacent longitudinal tapering deformations may comprise longitudinal grooves, ribs, steps or shoulders for example.
  • the preferred longitudinal tapered deformation are grooves and it is also preferred that such grooves be located closely adjacent to the longitudinal formation which may separate the longitudinal formations from each other.
  • the invention also includes within its scope a method of construction of the aforementioned tapered conduit and this method may include the step of passing conduit of tubular configuration having a specific orientation through a tapering station for the purpose of causing said conduit to have at least a pair of longitudinal deformations imparted thereto wherein each of said longitudinal deformations taper substantially uniformly from one end to the other wherein a longitudinal formation is interposed between each longitudinal deformation.
  • conduit is oriented at the tapering station so that each longitudinal deformation is formed on either side of the longitudinal formation which has already been preformed.
  • each longitudinal deformation may have already been partly formed when the conduit reaches the tapering station so that the only function of the tapering station is to cause the required longitudinal taper in each longitudinal deformation.
  • each longitudinal deformation is a rib or groove
  • such rib or groove may have already been preformed in the conduit for example by a preliminary pass of the conduit through a roll forming mill.
  • each longitudinal deformation will also be fully formed in the conduit so the tapering station has not only means for imparting each longitudinal deformation to the conduit but also means for causing the required degree of taper in each longitudinal deformation.
  • the tapering station While it is also possible to pass preformed conduit of the required tubular shape through the tapering station which may have already been formed at a location separate from the site of the tapering station it is preferred that the tapering station be located on a rear or outfeed end of a rolling mill so that metal plate or strip may be passed through the rolling mill ' so. as to already have the required shape before passing through the tapering station.
  • the invention also includes within its scope forming apparatus for forming the longitudinal deformations in the conduit.
  • This apparatus may include a first set of primary and secondary rollers and a second set of primary and secondary rollers to form the at least one pair of longitudinal deformations with one of the pair of primary rollers or the pair of secondary rollers being laterally movable relative to the other pair of primary or secondary rollers and also to the direction of movement of conduit through the forming apparatus to form the tapered longitudinal deformations.
  • one of the primary pair of rollers or secondary pair of rollers is stationary while the other pair of rollers is laterally movable or both pairs of rollers are movable toward and away from each other.
  • the former arrangement is the one that is preferred.
  • the conduit after passing through a rolling mill may be supported by appropriate support means such as a support mandrel before passing through the forming apparatus of the invention.
  • the support mandrel may also constitute means for orienting the tapered conduit so that it has a required specific orientation as it passed through the forming apparatus.
  • the forming apparatus of the invention may also include means for causing the lateral movement of the primary pair of rollers or the secondary pair of rollers and this means is suitably cam operated.
  • the forming apparatus may include a support block for each of the primary rollers and the secondary rollers.
  • the primary rollers and associated primary support block are located within the interior of the conduit and the secondary rollers and associated secondary support block are located externally of the conduit as it passes through the forming apparatus.
  • the secondary support block may be movable toward and away from the primary support block and this may be accomplished by the cam operated means referred to above.
  • the secondary support block may also support an idler roller which may engage a support slot located in a cam member located adjacent to the secondary support block.
  • the cam member is preferably circular and is rotatable by appropriate drive means.
  • the support slot in the cam member is suitably offset to the circumference or periphery of the cam member so that upon traversal of the idler roller in the support block a certain distance (eg from one end of the support slot to the other) will cause an inward movement of the secondary block relative to the primary block and thus cause the required taper in the longitudinal deformation being formed in the conduit.
  • guide means to guide the secondary block so that it may move a required fixed path which include toward and away from the primary block.
  • a suitable guide means is thus a pair of guide blocks located on each side of the secondary block.
  • This will mean the production of eight longitudinal deformations and this may be produced by providing four secondary blocks which may all move along a required path by the provision of the abovementioned guide means.
  • Each secondary block may mount a pair of secondary rollers which may co-act with a corresponding pair of primary rollers located on a centrally located primary block to produce two longitudinal deformations in each side wall of the rectangular conduit adjacent an associated corner edge.
  • FIG 1 is a plan view of an assembly line including forming apparatus constructed in accordance with the invention in conjunction with a roll forming mill;
  • FIG 2 is a side view of the assembly line shown in FIG 1;
  • FIG 3 is a perspective view of forming apparatus constructed in accordance with the invention
  • FIG 4 is a .perspective view of some components of the forming apparatus of FIG 3 not shown in FIG 3;
  • FIG 4A is an end view of the forming apparatus shown in FIG 3;
  • FIG 5 is a side view of the forming apparatus shown in FIG 5;
  • FIG 6 is a view similar to FIG 4A but with one end plate removed;
  • FIG 7 is a sectional view showing the engagement between a primary roller and a secondary roller and conduit interposed;
  • FIG 8 shows a side view of tapered conduit constructed in accordance with the invention
  • FIG 9 is a view of a corner region of the conduit along the line A-A of FIG 8;
  • FIG 10 is a view of a corner region of the conduit along the line B-B of FIG 8;
  • FIG 11 is a perspective view of the tapered conduit shown in FIG 8.
  • FIGS 12, 13, 14 and 15 illustrate alternative forms of tapered conduit to that shown in FIG 8 which may be made in accordance with the present invention.
  • Description of Preferred Embodiments of the Invention in the drawings and in particular in FIGS 1-2 there is shown an assembly line 10 including a sheet metal or strip coil holder 11 for feeding continuous sheet metal strip 9 to roll forming machine 13 having forming rolls 14 forming the required shape of the conduit from strip 9.
  • support stand 15 having support legs 16.
  • the mandrel 17 allows for lock seaming of overlapping parts of the conduit and to this end has sizing rollers 22 and final crimping rollers 23. Also shown is 5 forming apparatus 24 which includes tapering mechanism as hereinafter described and end table 26 having idler rollers 27 for shearing of conduit to the required length.
  • FIG 3 there is shown part of the forming apparatus of the invention which includes secondary support 10 blocks 28 having opposed recesses 29 and further recess 30. Each recess 29 mounts a secondary roller 31 having a forming rib 32. Each secondary roller is separated by mounting part 33. There is also shown idler roller 34 located in recess 30. There is shown one side secondary block 28A and a top 15 secondary block 28B. There is also shown primary support block 35 to which is mounted primary rollers 36 having forming grooves 37. Primary block 35 also has recesses 39 and 40 for supporting primary rollers 36. Conduit 12 is also illustrated having an appropriate orientation to rollers 31 and 36 and 20 also to support mandrel 17 which is integral with primary block 35. Conduit 12 also has lock seam 38.
  • FIG 4 there is shown a .more detailed view of the forming apparatus of the •invention which includes opposed end plates 41 and 42.
  • End plate 41 includes mounting holes 43 for 25 guide blocks 45 which also have corresponding mounting holes ' 49.
  • the four guide blocks 45 function to maintain each secondary block 28 in a fixed path by abutment surfaces 46.
  • End plate 42 is also provided with central cavity 47 and plate 41 is provided with central cavity 48.
  • cam plate 51 having central aperture 52 and internal surface 52A which bears against curved surfaces 45A of guide blocks 45.
  • support slots 53 which may mount on associated idler roller 34 of secondary blocks 28.
  • FIGS 4A-6 the operation of the forming apparatus of the invention is clearly shown.
  • each secondary block 28A, 28B, 28C and 28D is at an initial stage of movement with idler roller 34 engaged in an associated support slot 53 at a start point 57.
  • idler roller 34 engaged in an associated support slot 53 at a start point 57.
  • each support block 28A, 28B, 28C and 28D is then caused to move inwardly to primary block 35 and constrained to move in a fixed path by guide blocks 45.
  • a side view of this arrangement is shown in FIG 5.
  • each idler roller 34 has now moved the length of each slot 53 to approach a finish point 58. This has resulted in inward movement of each secondary block 28A, 28B, 28C and 28D as shown by the arrows in full outline to be proximal to primary block 35.
  • rollers 31 and 36 may now coact as shown in FIG 7 wherein a forming rib 32 of each roller 31 may mate with a corresponding forming groove 37 of each roller 36 to form a tapered groove 60 in conduit 12.
  • Rollers 31 and 32 may have stubs axles 61 engagable in sockets 62 in blocks 28 and 35.
  • cam plate 52 may be rotated at a predetermined angular speed to achieve movement of secondary rollers 31 into co-action with primary rollers 36.
  • the required co-action or engagement of rollers 31 and 36 may be suitably achieved by an appropriate drive means to rotate cam plate 52 at an angular velocity determined by the speed of the conduit through the tapering mechanism and the length of conduit required to be tapered.
  • the abovementioned embodiment illustrates location of the tapering mechanism before the cutting of the conduit on table 26.
  • the conduit may be cut to a desired length prior to passage through the tapering mechanism.
  • conduit 12 which has now been produced in accordance with the invention.
  • This conduit includes two pairs of opposed side walls 63 and 64 and corner edges 65 with tapered grooves 60 each located on either side of an associated corner edge 65. Also shown is lock seam 38. The taper of each groove 60 is shown progressively increasing in depth from point A to point B in both FIG 8 and FIGS 9-10.
  • tapered grooves 60 in conduit 12 will facilitate interfitting of adjacent sections of conduit 12 because as shown in FIGS 12-15 this will also cause a shrinkage or tapering of corner edges 65 while at the same time maintain structural integrity of webs 66 between grooves 60.
  • FIG 12 this is clearly shown with the arrows in full outline showing the shrinkage of corner edges 65 from point A to point B.
  • conduit 12A is shown at point A and conduit 12B is shown in phantom at point B.
  • tapered grooves 60 in accordance with the invention adjacent corner edges 65 this means that a uniform degree of taper of the conduit may be achieved without causing undue stresses or deformation in side walls 63 or 64 or indeed in webs 66.
  • interfitting of adjacent sections of conduit 12 is readily accomplished.
  • FIG 13 instead of grooves 60 there may be produced tapered ribs 67 in conduit in a variation of conduit produced in accordance with the invention adjacent corner edges 65. Again the view shown in full outline corresponds to point A in FIG 8 and the view in phantom corresponds to point B in FIG 8. In FIG 14 there is illustrated round tapered conduit
  • lock seam 38 and by the provision of tapered grooves 60 on each side of lock seam 38 tapered conduit may be produced having a uniform degree of shrinkage from point A to point B as indicated by conduit 12A in full outline and conduit 12B in phantom. It will be appreciated that lock seam 38 may .be internally formed as well as being externally formed as shown.
  • FIG 15 there is illustrated another form of conduit constructed in accordance with the invention wherein there is provided tapered shoulders 71 from point A to point B wherein each shoulder is located on either side of a corner edge 65. This also produces webs 66A located between each shoulder 71 and having a lesser depth than corner edges 65 as shown.
  • the "oil- canning" problem discussed above is of course not relevant to such conduit but location of each tapered longitudinal deformation closely adjacent each side of a lock seam may also minimise any potential stresses being exhibited in the final tapered conduit after the tapering operation. This may also ensure structural integrity of the remainder of the conduit and ensure uniform shrinkage of the round conduit after the tapering operation including the area occupied by the lock seam.
  • the forming apparatus of the invention may be modified to .make varying lengths of downpipe to comply with -the requirements of the customer or market place. Thus current standard lengths or modules of 1.8m, 2.4m and 3.0m may be made longer if required eg of the order of 5.0m to 10.0m.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

Le conduit tronconique décrit (12), qui a une extrémité de section transversale plus petite et une autre extrémité de section transversale plus grande, comprend au moins une bande longitudinale (65) qui se caractérise en ce qu'elle comporte une paire de dépressions longitudinales (60), qui ont chacune une conicité sensiblement uniforme d'une extrémité à l'autre et qui sont disposées de façon à ce que la bande longitudinale (65) se trouve entre les deux dépressions, afin de faciliter l'assemblage de sections similaires adjacentes du conduit tronconique, lequel peut avoir une section transversale ronde ou rectangulaire, la plus petite extrémité de l'une des sections pouvant être introduite dans la plus grande extrémité de l'autre section. Un procédé et un appareil de construction d'un tel conduit tronconique (12) utilisent deux ensembles (28, 35) de cylindres primaires (36) et secondaires (31), ainsi qu'un organe servant à orienter (17) le conduit de forme tubulaire (12) pour le faire passer à travers les ensembles (28, 35) des cylindres (36, 31) selon une configuration prédéterminée, et un organe servant à créer un mouvement relatif entre chaque cylindre primaire (36) et secondaire (31), afin de pratiquer une paire de dépressions longitudinales (60) sur le conduit (12) de part et d'autre de la bande longitudinale (65).
PCT/AU1991/000140 1990-04-12 1991-04-12 Conduit tronconique Ceased WO1991016156A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPJ9610 1990-04-12
AUPJ961090 1990-04-12

Publications (1)

Publication Number Publication Date
WO1991016156A1 true WO1991016156A1 (fr) 1991-10-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1991/000140 Ceased WO1991016156A1 (fr) 1990-04-12 1991-04-12 Conduit tronconique

Country Status (1)

Country Link
WO (1) WO1991016156A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019072732A (ja) * 2017-10-13 2019-05-16 日鐵住金建材株式会社 溝付き金属管の製造装置及び方法
IT202300013782A1 (it) * 2023-07-03 2025-01-03 Paolo Peruzzini Metodo per realizzare un tubo di pescaggio perfezionato di una caldaia.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071214A (en) * 1957-12-19 1963-01-01 Steinbichler Josef Composite tubular support, particularly tubular pole
US3802239A (en) * 1972-06-08 1974-04-09 Valmont Industries Machine and method for forming tapered tubes
AU1375383A (en) * 1982-03-26 1983-10-24 Sven Runo Vilhelm Gebelius Method for the manufacture of a conical tubular member, and amember manufactured according to the method
EP0318905A2 (fr) * 1987-12-02 1989-06-07 Rheinzink Gmbh Procédé et appareil pour la fabrication de tuyaux de descente

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071214A (en) * 1957-12-19 1963-01-01 Steinbichler Josef Composite tubular support, particularly tubular pole
US3802239A (en) * 1972-06-08 1974-04-09 Valmont Industries Machine and method for forming tapered tubes
AU1375383A (en) * 1982-03-26 1983-10-24 Sven Runo Vilhelm Gebelius Method for the manufacture of a conical tubular member, and amember manufactured according to the method
EP0318905A2 (fr) * 1987-12-02 1989-06-07 Rheinzink Gmbh Procédé et appareil pour la fabrication de tuyaux de descente

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019072732A (ja) * 2017-10-13 2019-05-16 日鐵住金建材株式会社 溝付き金属管の製造装置及び方法
IT202300013782A1 (it) * 2023-07-03 2025-01-03 Paolo Peruzzini Metodo per realizzare un tubo di pescaggio perfezionato di una caldaia.

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