US3314141A - Method and device for manufacturing metal tubes by helically coiling a sheet metal strip - Google Patents

Method and device for manufacturing metal tubes by helically coiling a sheet metal strip Download PDF

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Publication number
US3314141A
US3314141A US365947A US36594764A US3314141A US 3314141 A US3314141 A US 3314141A US 365947 A US365947 A US 365947A US 36594764 A US36594764 A US 36594764A US 3314141 A US3314141 A US 3314141A
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Prior art keywords
strip
coiling
tube
edges
generatrices
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US365947A
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English (en)
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Bacroix Marcel Andre
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Centre de Recherches de Pont a Mousson
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Centre de Recherches de Pont a Mousson
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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
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/122—Making tubes or metal hoses with helically arranged seams with welded or soldered seams
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/032—Seam welding; Backing means; Inserts for three-dimensional seams
    • B23K9/0325—Seam welding; Backing means; Inserts for three-dimensional seams helicoidal seams

Definitions

  • the present invention relates to the manufacture of tubes by helically coiling a metal strip and welding the edges of the latter along the contact helix.
  • the usual method employed for manufacturing tubes of this type includes feeding the metal strip in a direction which is oblique relative to the axis of the tube to be obtained and directly coiling this plane strip within 'a cylindrical tube-forming surface.
  • the edge-to-edge coiling with application of pressure, required by the buttwelding process can only be obtained if the edges of the strip have a chamfer which permits these two subsequently welded edges or lips to be assembled in the same plane without any tendency to overlap.
  • the weld is efiected at the junction point of the already coiled edge and the edge being coiled.
  • This method employs a ma chine of large size in view of the surface required for feeding the strip obliquely of the coiling axis.
  • the object of the present invention is to simplify this known technique by the use of a new method which dispenses with the chamfering of the edges of the strip and substantially reduce the overall size of the machines so as to form a straight manufacturing line.
  • the invention provides a method of manufacturing tubes by helically coiling a sheet metal strip of the type in which the edge of the initially formed coil of the tube and the edge of the coil in the course of formation are buttwelded after being suitably heated.
  • the metal strip having straight edges is fed to the machine in a direction parallel with the coiling axis and, in the course of formation of the tube, each portion of the strip is subjected in succession to the following treating stages: said portion is first so coiled as to impart thereto the shape of a cylindrical portion having the desired radius and generatrices which are oblique relative to the edges of the strip (or oblique relative to the direction of feed of the strip), the angle the generatrices make with the parallel edges of the strip, or initial angle being less than the angle the generatrices of the tube to be obtained make with its coiling helix or final angle; then said initial angle is progressively increased so as to bring it to the value of the final angle by so coiling the metal strip as to form an intermediate portion having the shape of a non-c
  • Another object of the invention is to provide a machine for carrying out said method.
  • Said machine comprises in combination: -a strip feeding device, a first coiling device oriented obliquely relative to the strip feeding direction, a second coiling device oriented in a direction parallel with the strip feeding direction, said second device being combined with heating means for heating the edges of the strip to be Welded, and means for maintaining said edges of the strip in contact after they have been brought together and strip guiding means located between the two coiling devices and adapted to create a progressive modificationin the orientation of the strip.
  • FIG. 1 is a plan view illustrating the method according to the invention
  • FIG. 2 is an elevational view taken along line 22 of FIG. 1;
  • FIG. 3 is a sectional view taken along line 3-3 of FIG. 1;
  • FIG. 4 is a section of the sheet metal strip employed for forming the tube
  • FIG. 5 is a diagrammatic plan view of a machine for carrying out the method according to the invention.
  • FIG. 6 is a sectional view taken along line 6-6 of FIG. 5;
  • FIG. 7 is a sectional view taken along line 7--7 of FIG. 5;
  • FIG. 7a is a view of a detail shown in FIG. 7;
  • FIG. 8 is a sectional view taken along line 88 of FIG. 5;
  • FIG. 9 is a diagrammatic sectional view on an enlarged scale of the device for maintaining in contact the adjacent strip edges of the first coil formed and the coil in course of formation;
  • FIG. 10 is a corresponding view on a smaller scale of a variant of the device for maintaining the edges in contact
  • FIG. 11 is a view similar to FIG. 3 of a variant of the method according to the invention.
  • FIGS. 1-4 The method of the invention for manufacturing a tube T from a sheet metal strip t is illustrated in FIGS. 1-4.
  • a strip T having straight unchamfered edges 1 is employed.
  • This strip T is fed horizontally in a direction AA which is parallel with the axis X--X of the tube T to be formed.
  • This strip is first bent or coiled along generatrices of a cylindrical portion 2, these generatrices being oblique relative to the edges of the strip and consequently relative to the feeding direction AA and preferably making with the latter an initial angle x which is less than the final angle y of that the coiling helix of the formed tube T makes with the generatrices of the latter,
  • the coiling radius of this cylindrical portion 2 is substantially equal to the radius of the tube to be obtained.
  • This intermediate portion 3 whose generatrices pass through the helix of the forward edge of the first coil formed .9, can be conical as shown in the chosen embodiment (FIG. 1), its generatrices therefore intersecting the same point S which is apex of this conical surface.
  • Its first generatrix G1 extending from the apex S and bearing on the helix of the edge of the first coil formed s also pertains to the first cylindrical portion 2 and its last generatrix G2, which intersects the generatrix G1 at S, intersects the edge contact point cor the point at which the adjacent edges of the strip are welded, also pertains to the second cylindrical portion 4.
  • the generatrices G1 and G2 make an angle therebetween equal to the angle x/ y the generatrix G1, and the other generatrices of the cylindrical portion 2 make with the feeding direction AA.
  • the coiling of the strip T is continued at the same coiling angle y as the cylindrical portion 4, thereby producing the tube T.
  • the edges of the strip to be welded are heated until they are white hot above the contact point of the strip edges (relative to the helical motion of the strip) for example by circulating an electric current along the edges from extreme points 5 and 6 so that these edges weld together at the contact or abutment point c.
  • the points 5 and 6 are at the same distance from the point c.
  • the heating conditions for heating the strip edges determine the position of the points 5 and 6 at which the electrodes must be mounted and the distance between these points so that these conditions determine the position of the apex S of the conical portion 3. The latter in fact results geometrically from the value of the angle 566.
  • FIGS. 5-8 An embodiment of a machine according to the invention for carrying out the method just described is shown in FIGS. 5-8.
  • the machine comprises in combination the following sub-assemblies:
  • a device II for the first oblique coiling is a device II for the first oblique coiling.
  • a device III for the second coiling is a device III for the second coiling.
  • a heating device V for heating the edges of the strip for example by high frequency (not shown).
  • the strip feeding device for feeding the strip t in a direction AA which is parallel with the axis XX of the tube T to be obtained, comprises a table having lower and upper guide rollers 7 mounted in pairs. Disposed on the edges of this guide table are parallel slideways 8 in which the straight edges 1 of the strip t move.
  • a drive device (not shown) feeds this strip and can comprise for example a pair of lower and upper transverse rollers which are in contact with the strip.
  • the device for the first oblique coiling (FIGS. 5 and 6) which forms the first cylindrical portion 2, comprises a stand including a bed 9, a block 10 carrying supporting and bending rollers, a beam 11 carrying countersupport rollers and swan-neck elements 12 carrying a bending plate.
  • the cylindrical support rollers 13, which are for example three in number, are oriented in the strip feed direction AA. In other words, their horizontal axes are perpendicular to this direction of feed. They are journalled in bearings 14 and 14a (FIGS. 5 and 6) supported by the bed 9 of the stand and by the support block 10.
  • the bending rollers 15 which are for example frustoconical and have vertical axes and are three in number, are aligned in a direction BB which is oblique relative to the feed direction A--A and makes an angle x with the latter.
  • the rollers 15 are carried by the support block 10.
  • the cylindrical support rollers 13 and the frustoconical bending rollers 15 are located below the strip t.
  • crowned countersupport rollers 16 having a horizontal axis, for example three in number, located above the strip r. These rollers 16 are carried by the support beam 11 which is integral with the support block 10, and their axes are horizontal and preferably perpendicular to the oblique direction BB and concurrent with the axes of the bending rollers 15.
  • a bending plate 17 in the form of a concave cylindrical portion is located above the bending rollers 15 and extending in the oblique direction BB.
  • the device for the second coiling (FIGS. 5, 7, 7d) forming the second cylindrical portion 4 and the tube T, comprises a stand including a bed 18, a support block 19 at the input end of the bending device, swan-neck elements 20 and a support block 21.
  • the support block 19 carries a support roller 22 adapted to support the outer strip edge of the conical portion 3 and of the cylindrical portion 4, that is, the edge opposed to the edge to be welded to the adjacent edge of the first coil formed s.
  • This roller 22 therefore applies said edge to be welded against the edge of the first coil formed s.
  • the roller 22, which is tangent to the edge of the strip at a point located on the generatrix G2, is preferably inclined relative to the horizontal, its axis being parallel with the radius of the tube T intersecting said tangent point.
  • the support block 19 also carries a counter-support roller 23 having a horizontal axis and being internally tangent to the cylindrical portion 4 of the strip on the generatrix G2 so as to guide said strip as it enters under the bending plate 24 carried by the swan-neck elements 20.
  • This plate 24 comprises a concave cylindrical surface corresponding to the outer surface of the tube T.
  • the generatrices of the cylindrical surface of this plate 24 are parallel with the strip feed direction AA.
  • Cooperating with the bending plate 24 are bending rollers 25 having an axis parallel with the axis XX of the tube T. These rollers are carried by the support block 21 and are located on the other side of the bending plate 24 relative to the axis XX of the tube T.
  • This guide plate is for example carried by the swan-neck element 20 of the second coiling device and is connected to the cylindrical bending plate 24 along the generatrix G2.
  • V The device heating the strip edge is merely represented by the position of the electrodes illustrated by two rectangles 5 and 6 in FIG. 5.
  • a bed 20a spanning the swan-neck elements 20 has a roller depending therefrom which maintains the strip edges to be welded in contact.
  • This roller has for example a generally cylindrical shape and has a median groove 27a for the passage of a weld bead. It is mounted (-FIG. 7) on a fork 27b which is pivotally mounted at 270 on the bed 20a.
  • the pivot 270 has the same inclination with respect to the horizontal as the radii of the tube T intersecting the generatrix G2.
  • the roller 27 is disposed tangentially with respect to the cylindrical portion 4 of the first coil formed s of the tube T in the zone of the point of contact 0 of the edges to be welded. Owing to the pivot 270, the axis of the roller 27 is oriented orthogonally to the helix of contact of the adjacent strip edges.
  • the bending plate 24 has an opening 28 through which the roller 27 extends.
  • the strip T driven by the driving device (not shown) is guided by the rollers 7 and by the lateral slideways 8 of the feed device I in the direction A-A. It is introduced between the rollers 13, 15 and 16. In contact with the rollers 16 it undergoes a first oblique bending or coiling. Thereafter, it is engaged against the oblique bending plate 17 which constitutes a corset which forms with the preceding rollers the first cylindrical portion 2. Between the first and second bending or coiling device the strip progressively modifies its orientation as shown by lthe intermediate conical portion 3.
  • the plate 36 which also forms a corset which suitably orients the generatrices, facilitates the engagement of the strip between the bending plate 24 and the roller 23 of the second bending device and permits the strip edge 050 to approach with precision the edge b6c of the first coil formed s.
  • the strip is thereafter engaged against the roller 22 between the bending plate 24 and the counter-support roller 23.
  • the strip thus undergoes a second bending or coiling and assumes a cylindrical curvature at 4. Thereafter it continues to coil under the effect of the thrust of the feed device.
  • the strip coils round from the generatrix G2 into a cylindrical portion 4 which becomes a coil s of the tube T to be formed.
  • the two adjacent strip edges are heated to white hot by the high frequency heating electrodes and 6. They are heated uniformly throughout their thickness. As the two edges move toward the point of contact c, the angle the generatrices of the conical surface 3 make with the generatrix G2, common to the cylindrical portion 2 and the first coil formed s, decreases and becomes zero at point c.
  • roller 27 maintains the heated strip edges in contact with each other and facilitates the butt-welding thereof in cooperation with the roller 22.
  • this device operates in a continuous manner and produces a tube T from a plane metal strip t.
  • the strip edges meet each other easily in edge-to-edge relation substantially on the same level or in the same plane without any relative sliding therebetween. This permits providing the strip with straight edges and dispensing with chamfers thereon, resulting in a considerable simplification in the preparation of the strips employed in the manufacture of helically wound tubes.
  • the strip edges to be Welded are heated at 5 and 6 to the same degree and uniformly throughout their thickness and this considerably improves the conditions and the quality of the buttweld obtained at the contact point 0.
  • Variants instead of comprising a single roller 27 for maintaining the strip edges in contact with each other the machine can be provided with a pair of outer conical rollers and, if desired, at least one inner roller, such as those described in the French Patent No. 1,303,559 filed on July 31, 1961.
  • FIG. illustrates the use of a pair of frustoconical rollers 29 which are rotatably mounted on a cylindrical head 30 depending from the bed 20a.
  • the generatrices G1 and G2 instead of being in the same horizontal plane are in two different horizontal planes owing to a modification in the manner in which the strip is fed and/or in the manner in which the first oblique coiling is efifected.
  • the generatrix G2 is at a lower level than the generatrix G1. In this case, they are not concurrent at the point S but are tangent to a helical curve s
  • the intermediate generatrices such as G3 and G4. All these generatrices tangent to the curve s define an intermediate surface portion connecting the cylindrical portions 2 and 4 which is not conical but helical.
  • cylindrical plate 17 of the second coiling device and the guide plate 26 for the conical portion 3 can be replaced by any other means such as a series of guide blocks or a series of suitably arranged rollers or both these means combined.
  • a method of producing a tube by helically coiling a strip of sheet metal into a series of complete coils which are buttwelded together after having been suitably heated comprising the steps of'feeding the strip which has straight edges to a strip coiling machine in a direction parallel with the axis of the tube and subjecting in the course of formation of the tube each portion of the strip corresponding to a complete coil in the produced tube to the following successive treating stages: initially coiling said portion so as to impart thereto the shape of a cylindrical portion having the desired radius and generatrices which are oblique relative to the edges of the strip, the initial angle that the generatrices make with the parallel edges of the strip being less than the final angle that the generatrices of the tube to be obtained make with the coiling helix of the tube; progressively increasing said initial angle so as to bring it to the value of said final angle by so coiling the strip as to form an intermediate portion having the shape of a non-cylindrica-l developable surface; coiling the strip a second time at
  • noncylindrical intermediate portion has a generatrix common to the first cylindrical portion and another generatrix common to the second cylindrical portion, said two generatrices making therebetween an angle equal to said initial angle.
  • a machine for producing a tube comprising in combination a strip feeding device, a first coiling device oriented obliquely relative to the strip feeding direction, a
  • second coiling device oriented in a direction parallel with the strip feeding direction, said second device being combined with heating means for heating the edges of the strip to be welded, and means for maintaining said edges of the strip in contact after they have been brought together, and strip guiding means located between the two coiling devices and adapted to create a progressive modification in the orientation of the strip.
  • the first coiling device includes a series of support roller located below the plane of feed of the strip, a series of countersupport rollers located above the plane of feed of the strip, and a series of bending rollers located on the same side of the strip as the support rollers, the rollers of each series being in facing relation and the bending rollers being aligned in a direction which is oblique relative to the sheet feed direction and makes with the latter said initial angle.
  • the second continuous coiling device includes a cylindrical forming element or corset and, in combination, at least one roller for maintaining the sheet edges to be welded in contact and a pressure-applying roller for applying pressure on the opposite edges and tangent to said edges at a point located on the second generatrix.
  • the guiding means between the first coiling device and the second coiling device comprises a curved plate connected to said forming element of the second coiling device on a generatrix common to the second cylindrical portion and the non-cylindrical intermediate portion interconnecting the first and second cylindrical portions.

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  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
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US365947A 1963-07-23 1964-05-08 Method and device for manufacturing metal tubes by helically coiling a sheet metal strip Expired - Lifetime US3314141A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR942395A FR1371309A (fr) 1963-07-23 1963-07-23 Procédé et dispositif pour la fabricaction de tubes métalliques par enroulement en hélice d'une bande de tôle

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3417587A (en) * 1966-08-15 1968-12-24 Garland Steel Company Spiral pipe machine
US3481025A (en) * 1967-03-27 1969-12-02 Driam Ag Method and apparatus for reinforcing the walls of welded pipes or other tubular elements
US3601570A (en) * 1967-06-14 1971-08-24 Pacific Roller Die Co Inc Helical pipe-forming and welding apparatus method
US3650015A (en) * 1969-02-04 1972-03-21 Pacific Roller Die Co Inc Helical pipe making method
US3722075A (en) * 1971-01-19 1973-03-27 J Fay Method for continuous production of spiral pipe
US3762448A (en) * 1966-09-07 1973-10-02 Struthers Scientific Int Corp Thick walled pressure vessel
US3776448A (en) * 1971-01-19 1973-12-04 J Fay Apparatus for continuous production of spiral pipe
US4081981A (en) * 1975-01-18 1978-04-04 Xaver Lipp Apparatus for producing a pipe from metal strip
US4664307A (en) * 1983-07-25 1987-05-12 General American Transportation Corporation Spirally welded tank cars
US6279813B1 (en) * 1999-10-20 2001-08-28 Edward A. Akins Cylindrical helical seamed tube and method and apparatus therefore
EP3219384A1 (en) * 2016-03-16 2017-09-20 Casale SA Walls for catalytic beds of radial- or axial-flow reactors
US11213872B2 (en) * 2015-06-26 2022-01-04 Keystone Tower Systems, Inc. Spiral forming

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2487704A1 (fr) * 1980-07-29 1982-02-05 Pont A Mousson Procede et dispositif pour la fabrication de tubes metalliques par enroulement en helice d'une bande de tole

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1156042B (de) * 1961-12-02 1963-10-24 Kocks Gmbh Friedrich Anlage zum Herstellen von Schraubennahtrohren

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1156042B (de) * 1961-12-02 1963-10-24 Kocks Gmbh Friedrich Anlage zum Herstellen von Schraubennahtrohren

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3417587A (en) * 1966-08-15 1968-12-24 Garland Steel Company Spiral pipe machine
US3762448A (en) * 1966-09-07 1973-10-02 Struthers Scientific Int Corp Thick walled pressure vessel
US3481025A (en) * 1967-03-27 1969-12-02 Driam Ag Method and apparatus for reinforcing the walls of welded pipes or other tubular elements
US3601570A (en) * 1967-06-14 1971-08-24 Pacific Roller Die Co Inc Helical pipe-forming and welding apparatus method
US3650015A (en) * 1969-02-04 1972-03-21 Pacific Roller Die Co Inc Helical pipe making method
US3722075A (en) * 1971-01-19 1973-03-27 J Fay Method for continuous production of spiral pipe
US3776448A (en) * 1971-01-19 1973-12-04 J Fay Apparatus for continuous production of spiral pipe
US4081981A (en) * 1975-01-18 1978-04-04 Xaver Lipp Apparatus for producing a pipe from metal strip
US4664307A (en) * 1983-07-25 1987-05-12 General American Transportation Corporation Spirally welded tank cars
US6279813B1 (en) * 1999-10-20 2001-08-28 Edward A. Akins Cylindrical helical seamed tube and method and apparatus therefore
US11213872B2 (en) * 2015-06-26 2022-01-04 Keystone Tower Systems, Inc. Spiral forming
US11731181B2 (en) 2015-06-26 2023-08-22 Keystone Tower Systems, Inc. Spiral forming
EP3219384A1 (en) * 2016-03-16 2017-09-20 Casale SA Walls for catalytic beds of radial- or axial-flow reactors
WO2017157717A1 (en) * 2016-03-16 2017-09-21 Casale Sa Walls for catalytic beds of radial- or axial-flow reactors
US20190076805A1 (en) * 2016-03-16 2019-03-14 Casale Sa Walls for catalytic beds of radial- or axial-flow reactors
AU2017234973B2 (en) * 2016-03-16 2021-05-27 Casale Sa Walls for catalytic beds of radial- or axial-radial flow reactors
US11369930B2 (en) * 2016-03-16 2022-06-28 Casale Sa Walls for catalytic beds of radial- or axial-flow reactors

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FR1371309A (fr) 1964-09-04
GB1017318A (en) 1966-01-19
BE644579A (no) 1964-07-01

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