EP0885071B1 - Method and apparatus for producing helically-wound lock-seam tubing with reduced lubrication - Google Patents

Method and apparatus for producing helically-wound lock-seam tubing with reduced lubrication Download PDF

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Publication number
EP0885071B1
EP0885071B1 EP96922317A EP96922317A EP0885071B1 EP 0885071 B1 EP0885071 B1 EP 0885071B1 EP 96922317 A EP96922317 A EP 96922317A EP 96922317 A EP96922317 A EP 96922317A EP 0885071 B1 EP0885071 B1 EP 0885071B1
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EP
European Patent Office
Prior art keywords
strip
lubricant
edge
forming
edge portions
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.)
Expired - Lifetime
Application number
EP96922317A
Other languages
German (de)
French (fr)
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EP0885071A1 (en
Inventor
Conny Pettersson
Donald Niklasson
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.)
Lindab AB
Original Assignee
Lindab AB
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
Priority claimed from US08/497,018 external-priority patent/US5606884A/en
Priority claimed from SE9502367A external-priority patent/SE507007C2/en
Application filed by Lindab AB filed Critical Lindab AB
Publication of EP0885071A1 publication Critical patent/EP0885071A1/en
Application granted granted Critical
Publication of EP0885071B1 publication Critical patent/EP0885071B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • 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
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/121—Making tubes or metal hoses with helically arranged seams with seams being neither welded nor soldered
    • 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
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/126—Supply, or operations combined with supply, of strip material

Definitions

  • the present invention relates to the production of helically-wound lock-seam tubing, and more specifically concerns a method and an apparatus for such production with a reduced need of lubrication.
  • the metal strip used for the production in question is normally coated with zinc in order to be able to withstand corrosion.
  • the metal strip is thus galvanised, which leads to problems that are well-known to the skilled person.
  • Another problem is that zinc fragments are released as a result of the sliding of the metal strip between the guiding plates before the forming head, which leads to a build-up of zinc on the opposite faces of these guiding plates. If the build-up of zinc on the guiding plates is too considerable, the feeding of the metal strip between the guiding plates can be disturbed.
  • Another disadvantage is that the zinc coating on the metal strip is softened and adheres to the inside of the forming head owing to significant frictional forces and heat development in the forming head. This renders more difficult the forming of the tubing in the forming head.
  • tubes of smaller diameter are often inserted in tubes of greater diameter in order to save space. Oil on the outside of the smaller tubes is then transferred to the inside of the bigger tubes.
  • a special disadvantage is that an excess of oil in the lock seam may cause the tube to "spin" or slide during transportation and handling. As a result of such a spin, the tube diameter increases and consequently the sealing is impaired and standard components cannot be fitted on the tube.
  • a further object of the invention is to provide the production of helically-wound lock-seam tubes which are pleasant to handle for the personnel.
  • Another object of the invention is to provide a method and an apparatus which are easily adapted to existing machines.
  • the tubing produced in accordance with the invention may, for example, be used in ventilation duct systems.
  • drive rollers 11 feed a metal strip 12 (arrow A) through an edge-forming assembly having rolls 13, by which longitudinal edge portions 16a, 16b are formed.
  • the metal strip 12 is formed and helically wound in a forming head 14 in a known manner for producing a tube 15.
  • the forming head 14 has clinching rollers 17-19 for forming a lock seam 25 on the tube 15 fed out of the forming head 14 (arrow B).
  • a pair of guiding plates 20 are arranged between the drive rollers 11 and the forming head 14, as is conventional.
  • a conduit 30 for supplying a lubricant, for example oil, to the metal strip 12 is arranged under the edge-forming assembly 13.
  • the conduit 30 is connected to an oil supply 31.
  • a similar oil conduit 32 and an oil supply 33 may be arranged after the drive rollers 11, as will be discussed below.
  • the oil conduit 30 is disposed at the edge portion 16a, which in the edge-forming assembly 13 is given the shape of a Z (see Fig. 4).
  • the oil conduit 30 has a supply opening 34, which is either applied to the strip 12 or disposed at a short distance therefrom.
  • the supply opening 34 of the oil conduit 30 is disposed at a greater distance from the metal strip 12, but there is a brush member 35 provided at the end of the conduit 30.
  • the brush member 35 is in permanent engagement with the metal strip 12 and compensates for any vertical movements of the strip 12 in production.
  • Fig. 4 shows the Z-shaped edge portion 16a and the L-shaped edge portion 16b, which are formed in the edge-forming assembly.
  • a corresponding oil supply assembly 32, 33 may optionally be provided after the drive rollers 11.
  • the oil conduit 32 has an opening 36 disposed in a corresponding opening in the lower guiding plate 20.
  • scraper means 40-43 can be provided before, in connection with and after the forming head 14.
  • the scraper 40 comprises rubber lips (not shown) gripping around the edge portions 16a, 16b of the strip 12.
  • the scraper 41 on the forming head 14 also has rubber lips (not shown), whereas the scraper 42 arranged in an opening (not shown) of the forming head 14 has means (for example of paper) for absorbing oil.
  • the scraper 43 arranged on the outside of the tube 15 can be of any suitable type, preferably a rubber lip member.
  • the apparatus can be provided with further scraper and wiper means for the removal of oil.
  • the brush member can be of any other suitable design.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Lubricants (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Wire Processing (AREA)

Abstract

In a method and an apparatus for producing helically-wound lock-seam tubing (15) from a metal strip (12) having longitudinal edge portions (16a, 16b), the strip (12) is fed to a forming head (14) and formed into helical shape. A lubricant is locally supplied (at 34) on that side of the strip (12) which forms the outside of the tube (15), said lubricant being supplied over only a limited portion of the width of the strip (12).

Description

FIELD OF THE INVENTION
The present invention relates to the production of helically-wound lock-seam tubing, and more specifically concerns a method and an apparatus for such production with a reduced need of lubrication.
BACKGROUND ART
Known machines for producing helically-wound lock-seam tubing are disclosed by, for example, British Patent Publication GB 2,213,748 and US Patent No. 4,706,481. These machines are well-known to the person skilled in the art and thus need not to be described in any detail here. Several further developments of such machines are available on the market, but these machines still suffer from certain drawbacks, as will be discussed in the following.
The metal strip used for the production in question is normally coated with zinc in order to be able to withstand corrosion. The metal strip is thus galvanised, which leads to problems that are well-known to the skilled person.
When the metal strip is edge-formed in the roller assembly preceding the forming head, small fragments of zinc are released from the metal strip and adhere to the edge-forming rollers. Owing to these zinc fragments, the diameter of the edge-forming rollers increases, especially in the last pair of rollers. Since these rollers are not resiliently journalled, the clamping force in the nip between two rollers is considerably increased as a result of the build-up of zinc on the rollers. In severe cases, these undesirable forces are so significant that the rollers are broken, which causes stoppages of production.
Another problem is that zinc fragments are released as a result of the sliding of the metal strip between the guiding plates before the forming head, which leads to a build-up of zinc on the opposite faces of these guiding plates. If the build-up of zinc on the guiding plates is too considerable, the feeding of the metal strip between the guiding plates can be disturbed.
Another disadvantage is that the zinc coating on the metal strip is softened and adheres to the inside of the forming head owing to significant frictional forces and heat development in the forming head. This renders more difficult the forming of the tubing in the forming head.
Hitherto, the problems related to the released zinc fragments have been solved by supplying lubricant, normally oil, to the metal strip on different places in the machine. For example, such lubrication is discussed in US Patent No. 2,136,943. Lubrication of metal strips is also discussed in US Patent No. 3,750,439 and the Russian Publication No. 835,558.
In most machines available on today's market, the oil is, however, supplied to the metal strip in a very simple manner. Traditionally, the lower roller of the first pair of rollers in the edge-forming assembly is permanently immersed in oil in a trough, by means of which oil is supplied over the total width of the metal strip. However, this arrangement suffers from several drawbacks, as will be discussed below.
As the roller immersed in oil in the oil trough rotates, oil is spread to the upper surface of the metal strip, which later will form the inside of the tube. The finished tubes are thus covered with oil on both the inside and the outside, which has unfavourable consequences.
If the tubes are used in ventilation duct systems, dust and other particles accumulate on the inside of the tube, which in turn becomes the breeding-ground of bacteria, virus, mould and the like, which may be dangerous to people's health. Further, accumulated dirt on the inside of the tube causes reduction of the tube inner cross-section with the consequence that the air flow rates and ventilation efficiencies for which the tube was originally designed are no longer upheld.
Similarly, dust and other particles accumulate on the outside of the tubes, making them unpleasant to handle for the personnel. Further, the tubes have to be cleaned on the outside if they are to be painted.
During transportation, tubes of smaller diameter are often inserted in tubes of greater diameter in order to save space. Oil on the outside of the smaller tubes is then transferred to the inside of the bigger tubes.
A special disadvantage is that an excess of oil in the lock seam may cause the tube to "spin" or slide during transportation and handling. As a result of such a spin, the tube diameter increases and consequently the sealing is impaired and standard components cannot be fitted on the tube.
In recent years, the demand for oil-free, helically-wound lock-seam tubing has increased, and the finding of a solution to the above-mentioned problems is therefore of great interest.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention, starting from a method and an apparatus according to the preambles of claims 1 and 4 (see US 2 136 943 A), to remedy the above-mentioned drawbacks by providing a method and an apparatus for producing helically-wound lock-seam tubing using a minimum of lubricants.
A further object of the invention is to provide the production of helically-wound lock-seam tubes which are pleasant to handle for the personnel.
Another object of the invention is to provide a method and an apparatus which are easily adapted to existing machines. The tubing produced in accordance with the invention may, for example, be used in ventilation duct systems.
These objects are achieved by a method as set forth in the appended independent claim 1, preferred variants thereof being defined in subclaims 2-3.
The above objects are also achieved by an apparatus as set forth in the appended independent claim 4, preferred embodiments thereof being defined in subclaims 5-9.
Practical tests of the invention using oil as lubricant have yielded excellent results. Compared with conventional production in accordance with the above description of the background art, the oil on the outside of the finished tube has been reduced by at least 25%, and the inside of the tube is almost free from oil. Since no oil trough is used and much less oil is spread, the surroundings of the machine are much more pleasant for the operator.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to the accompanying drawings showing preferred embodiments of the invention. In the drawings,
  • Fig. 1 schematically illustrates an embodiment of the apparatus according to the invention,
  • Fig. 2 shows a cross-section of the metal strip before the edge-forming assembly,
  • Fig. 3 is a view similar to Fig. 2 but shows another embodiment of the lubricant-supplying means, and
  • Fig. 4 shows a cross-section of the metal strip after the edge-forming assembly.
    • DESCRIPTION OF PREFERRED EMBODIMENTS
    As shown in Fig. 1, drive rollers 11 feed a metal strip 12 (arrow A) through an edge-forming assembly having rolls 13, by which longitudinal edge portions 16a, 16b are formed. The metal strip 12 is formed and helically wound in a forming head 14 in a known manner for producing a tube 15. The forming head 14 has clinching rollers 17-19 for forming a lock seam 25 on the tube 15 fed out of the forming head 14 (arrow B). A pair of guiding plates 20 are arranged between the drive rollers 11 and the forming head 14, as is conventional.
    A conduit 30 for supplying a lubricant, for example oil, to the metal strip 12 is arranged under the edge-forming assembly 13. The conduit 30 is connected to an oil supply 31. Optionally, a similar oil conduit 32 and an oil supply 33 may be arranged after the drive rollers 11, as will be discussed below.
    As can be seen in Fig. 2, the oil conduit 30 is disposed at the edge portion 16a, which in the edge-forming assembly 13 is given the shape of a Z (see Fig. 4). The oil conduit 30 has a supply opening 34, which is either applied to the strip 12 or disposed at a short distance therefrom.
    In the embodiment shown in Fig. 3, the supply opening 34 of the oil conduit 30 is disposed at a greater distance from the metal strip 12, but there is a brush member 35 provided at the end of the conduit 30. The brush member 35 is in permanent engagement with the metal strip 12 and compensates for any vertical movements of the strip 12 in production.
    Fig. 4 shows the Z-shaped edge portion 16a and the L-shaped edge portion 16b, which are formed in the edge-forming assembly.
    Since oil is supplied locally and only on that side of the strip 12 which forms the outside of the tube 15, the finished tube 15 is almost free from oil on the inside. As is clearly understood from Figs 2 and 3, oil is applied to the strip 12 over only a very limited portion of the width of the strip 12. No oil is spread to the upper side of the strip 12.
    In order to ensure that no zinc fragment build-up takes place on the inside of the guiding plates 20, a corresponding oil supply assembly 32, 33 may optionally be provided after the drive rollers 11. The oil conduit 32 has an opening 36 disposed in a corresponding opening in the lower guiding plate 20.
    In order to further reduce the amount of oil on the strip 12, scraper means 40-43 can be provided before, in connection with and after the forming head 14. In practice, the scraper 40 comprises rubber lips (not shown) gripping around the edge portions 16a, 16b of the strip 12. Preferably, the scraper 41 on the forming head 14 also has rubber lips (not shown), whereas the scraper 42 arranged in an opening (not shown) of the forming head 14 has means (for example of paper) for absorbing oil. The scraper 43 arranged on the outside of the tube 15 can be of any suitable type, preferably a rubber lip member.
    Finally, it should be mentioned that the invention is by no means restricted to the embodiments described herein, but that several modifications are conceivable within the inventive concept and the scope of the appended claims. For example, the apparatus can be provided with further scraper and wiper means for the removal of oil. Further, the brush member can be of any other suitable design.

    Claims (9)

    1. A method for producing helically-wound lock-seam tubing (15) from a metal strip (12) having longitudinal edge portions (16a, 16b), comprising the steps of: feeding the strip (12) to a forming head (14); forming the strip (12) into helical shape in the forming head (14), whereby the edge portions (16a, 16b) of the helically-formed strip (12) are brought into engagement with each other; clinching the engaging edge portions (16a, 16b) of the strip (12) to form a helically-wound lock seam (25) on a tube (15) formed in the forming head (14); and feeding the helically-wound lock-seam tube (15) out of the forming head (14); characterised in that, before the forming head (14), a lubricant is supplied locally on that side of the strip (12) which forms the outside of the tube (15), the lubricant being supplied over only a limited portion of the width of the strip (12), wherein the lubricant is supplied to the strip (12) at a point adjacent to one of the edge portions (16a) of the strip (12).
    2. A method as claimed in claim 1, wherein the edge portions (16a, 16b) of the strip (12) are edge-formed in an edge-forming assembly (13) preceding the forming head (14), the lubricant being supplied to the strip (12) before the edge-forming assembly (13).
    3. A method as claimed in claim 2, wherein a first one of the edge portions (16a) of the strip (12) is edge-formed in such a way that a partial cross-section through the first edge portion (16a) of the strip (12) is Z-shaped, whereas a second one of the edge portions (16b) of the strip (12) is edge-formed in such a way that a partial cross-section through this second portion (16b) of the strip (12) is L-shaped, the lubricant being supplied to the strip (12) adjacent to the Z-shaped edge portion (16a).
    4. An apparatus for producing helically-wound lock-seam tubing (15) from a metal strip (12) having longitudinal edge portions (16a, 16b), comprising means (11) for feeding the strip (12) to a forming head (14); means for forming the strip (12) into helical shape in the forming head (14) and for bringing the edge portions (16a, 16b) of the helically-wound strip into engagement with each other; a clinching assembly (17-19) for clinching the engaging edge portions (16a, 16b) of the strip (12) to form a helically-wound lock seam (25) on a tube (15) formed in the forming head (14); and means for feeding the helically-wound lock-seam tube (15) out of the forming head (14); characterised by means (30, 34), arranged before the forming head (14), for locally supplying a lubricant to that side of the strip (12) which forms the outside of the tube (15), the lubricant being supplied over only a limited portion of the width of the strip (12), wherein the lubricant-supplying means (30, 34) comprises a conduit (30) with a supply opening (34) disposed adjacent to one of the edge portions (16a) of the strip (12).
    5. An apparatus as claimed in claim 4, wherein the opening (34) of the lubricant-supplying conduit (30) is applied to the strip (12).
    6. An apparatus as claimed in claim 4, wherein the opening (34) of the lubricant-supplying conduit (30) is disposed at a distance from the strip (12).
    7. An apparatus as claimed in claim 6, wherein the lubricant-supplying conduit (30) has a brush member (35) which is provided at said opening (34) and which is in permanent engagement with the strip (12).
    8. An apparatus as claimed in any one of claims 4-7, further comprising an assembly (13) for forming said edge portions (16a, 16b) before the forming head (14), the lubricant-supplying means (30, 34) being arranged before the edge-forming assembly (13).
    9. An apparatus as claimed in claim 8, wherein the edge-forming assembly (13) comprises means for forming a first one of the edge portions (16a) of the strip (12) in such a way that a partial cross-section through this first edge portion (16a) is Z-shaped, the edge-forming assembly (13) further comprising means for forming a second one of the edge portions (16b) of the strip (12) in such a way that a partial cross-section through this second edge portion (16b) of the strip (12) is L-shaped, the lubricant-supplying means (30, 34) being so arranged that lubricant is supplied to the strip (12) adjacent to the first Z-shaped edge portion (16a).
    EP96922317A 1995-06-30 1996-06-17 Method and apparatus for producing helically-wound lock-seam tubing with reduced lubrication Expired - Lifetime EP0885071B1 (en)

    Applications Claiming Priority (5)

    Application Number Priority Date Filing Date Title
    SE9500236 1995-01-20
    US08/497,018 US5606884A (en) 1995-06-30 1995-06-30 Method and apparatus for producing helically-wound lock-seam tubing with reduced lubrication
    US497018 1995-06-30
    SE9502367A SE507007C2 (en) 1995-06-30 1995-06-30 System for producing helically-wound lock-seam tubing with reduced lubrication
    PCT/SE1996/000786 WO1997002102A1 (en) 1995-06-30 1996-06-17 Method and apparatus for producing helically-wound lock-seam tubing with reduced lubrication

    Publications (2)

    Publication Number Publication Date
    EP0885071A1 EP0885071A1 (en) 1998-12-23
    EP0885071B1 true EP0885071B1 (en) 2000-11-15

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP96922317A Expired - Lifetime EP0885071B1 (en) 1995-06-30 1996-06-17 Method and apparatus for producing helically-wound lock-seam tubing with reduced lubrication

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    EP (1) EP0885071B1 (en)
    JP (1) JP2001527467A (en)
    KR (1) KR19990028507A (en)
    AT (1) ATE197560T1 (en)
    AU (1) AU6322596A (en)
    CZ (1) CZ288687B6 (en)
    DE (1) DE69610996T2 (en)
    HU (1) HUP9903975A3 (en)
    NO (1) NO975925L (en)
    PL (1) PL179963B1 (en)
    RU (1) RU2135318C1 (en)
    WO (1) WO1997002102A1 (en)

    Families Citing this family (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    RU2232656C2 (en) * 2002-03-22 2004-07-20 Меликов Эдуард Николаевич Tube making method and apparatus for performing the same
    EP1670950A2 (en) 2003-10-10 2006-06-21 Yissum Research Development Company, of The Hebrew University of Jerusalem Method and kit for assessing anxiety or disposition thereto in a subject
    IT202000005728A1 (en) 2020-03-18 2021-09-18 Zeffiro MACHINERY FOR PRODUCING SPIRAL SEAMED PRE-COLORED METALLIC PIPES, RELATIVE DUCT AND RELATIVE METHOD
    DE102021110492B4 (en) 2021-04-23 2026-02-26 Häusler Holding Ag Device and method for manufacturing a double-walled pipe

    Citations (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US2136943A (en) * 1936-01-02 1938-11-15 American Rolling Mill Co Manufacture of helical lock seam pipe

    Family Cites Families (8)

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    Publication number Priority date Publication date Assignee Title
    US3750439A (en) * 1971-01-20 1973-08-07 Sirachenko E Method and apparatus for making corrugated pipe
    DE2553481C3 (en) * 1975-11-28 1981-07-02 Silo Verfahrens AG, Zug Device for producing a pipe from a sheet metal strip
    SU835358A1 (en) * 1979-08-31 1981-06-07 Фрунзенский Конструкторско-Технологическийинститут По Кормоуборочным Машинам Agitator
    SU899300A1 (en) * 1980-05-19 1982-01-23 Всесоюзный ордена Ленина научно-исследовательский и проектно-конструкторский институт металлургического машиностроения External weld-sqeezing mechanism
    SU1007794A1 (en) * 1981-06-05 1983-03-30 Предприятие П/Я Р-6476 Hollow articles production method
    FR2555920B1 (en) * 1983-12-06 1987-05-07 Coflexip DEVICE FOR CONTINUOUSLY MAKING A SPIRAL TUBULAR STRUCTURE IN STAPED SHEET
    ATE72531T1 (en) * 1985-06-18 1992-02-15 Spiro America Inc PIPE CUTTING DEVICE.
    GB2213748B (en) * 1987-12-21 1991-10-09 Spiro Machines Sa Production of spirally-seamed corrugated metal tubing

    Patent Citations (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US2136943A (en) * 1936-01-02 1938-11-15 American Rolling Mill Co Manufacture of helical lock seam pipe

    Also Published As

    Publication number Publication date
    PL179963B1 (en) 2000-11-30
    NO975925D0 (en) 1997-12-16
    NO975925L (en) 1998-02-02
    CZ288687B6 (en) 2001-08-15
    DE69610996T2 (en) 2001-03-15
    EP0885071A1 (en) 1998-12-23
    KR19990028507A (en) 1999-04-15
    ATE197560T1 (en) 2000-12-15
    AU6322596A (en) 1997-02-05
    HUP9903975A3 (en) 2000-04-28
    HUP9903975A2 (en) 2000-03-28
    RU2135318C1 (en) 1999-08-27
    DE69610996D1 (en) 2000-12-21
    JP2001527467A (en) 2001-12-25
    PL323928A1 (en) 1998-04-27
    WO1997002102A1 (en) 1997-01-23
    CZ416297A3 (en) 1999-04-14

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