EP0735546A1 - Drahtverlegung rundum einer Seele - Google Patents

Drahtverlegung rundum einer Seele Download PDF

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Publication number
EP0735546A1
EP0735546A1 EP96200701A EP96200701A EP0735546A1 EP 0735546 A1 EP0735546 A1 EP 0735546A1 EP 96200701 A EP96200701 A EP 96200701A EP 96200701 A EP96200701 A EP 96200701A EP 0735546 A1 EP0735546 A1 EP 0735546A1
Authority
EP
European Patent Office
Prior art keywords
steel wire
affected zones
yield strength
core
lengths
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Withdrawn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
EP96200701A
Other languages
English (en)
French (fr)
Inventor
Udo Adriaensen
Urbain D'haene
Geert Hooghe
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.)
Bekaert NV SA
Original Assignee
Bekaert NV SA
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 Bekaert NV SA filed Critical Bekaert NV SA
Priority to EP96200701A priority Critical patent/EP0735546A1/de
Publication of EP0735546A1 publication Critical patent/EP0735546A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping

Definitions

  • the present invention relates to a method of laying a layer of at least one steel wire around a core of a cable wherein the steel wire consists of several lengths, each length having a leading end and a trailing end, the trailing end of the length being connected to the leading end of a subsequent length.
  • the core of such a cable may comprise a plurality of copper or aluminium wires which serve as conductors of electrical energy and which may be embedded in a matrix of synthetic material.
  • such a core may comprise a plurality of fibres such as glass fibres for the transfer of communication.
  • a layer of at least one steel wire around the core serves to give the necessary strength to the entire cable, gives protection to the cable and builds a Faraday screen against magnetic fields.
  • the layer may itself be embedded in or enveloped by a matrix of another synthetic material.
  • the steel wire or steel wires in the layer are subjected to a plastical deformation, e.g. a plastical torsion, prior to the cable formation or just alter the cable formation so that the steel wires take their proper position and form in the layer.
  • the present invention aims at avoiding the drawbacks of the prior art. It is an object of the present invention to provide for a method of laying at least one steel wire around a core where the steel wire or steel wires with a higher tensile strength can be used and/or where the quality of the finished product is better and/or where fractures of the steel wires are reduced.
  • a method of laying a layer of at least one steel wire around a core The steel wire consists each of several lengths where each of the lengths have a leading end and a trailing end.
  • the method comprises following steps :
  • Connecting the trailing end of the lengths to the leading end of a subsequent length can be done by welding which results in heat-affected zones in the neighbourhood of the welds and in non-affected zones elsewhere.
  • the yield strength is hereby defined as the strength at 0.2 % permanent elongation and is in the litterature often referred to as ⁇ 0.2 .
  • the yield strength increases as the tensile strength increases and vice versa.
  • Each steel steel wire can be considered as a series connection of strong parts with a higher tensile strength or yield strength, i.e. the non-affected zones, and weak parts with a lower tensile strength or yield strength, i.e. the heat-affected zones.
  • the stresses introduced in the outer steel wires during their plastical deformation in step (b) seem to concentrate mainly in the weak parts, which results in the discontinuities and even in fractures of the steel wires.
  • Equalizing the yield strengths in both the non-affected zones and the heat-affected zones could be considered but does not give adequate results for the following reasons. Reducing the yield strength in the non-affected zones to become substantially equal to the yield strength in the heat-affected zones avoids the alternation of weak and strong parts and, as a consequence, avoids that the helical twisted configuration mainly concentrates in the heat-affected zones.
  • the helical twisted configuration on the contrary, is spread over a much larger distance along the steel wires. This reduces the occurrence of discontinuites and, as a consequence, the frequency of wire fractures, on the one hand, but, on the other hand, lowers considerably the overall yield strength of the outer wires.
  • step (c) keeps the overall yield strength of the steel wires unaffected. Furthermore, the present invention can be introduced without necessitating amendments to the other cable formation steps. Moreover, the present invention does not slow down the cable formation or wrapping process.
  • the steel wires have preferably a non-round transversal cross-section, such as a flat, rectangular, trapezoidal, triangular or Z-like cross-section in order to increase the filling factor of the cable, i.e. the percentage of steel cross-section with respect to the global cross-section of the cable.
  • a non-round transversal cross-section such as a flat, rectangular, trapezoidal, triangular or Z-like cross-section in order to increase the filling factor of the cable, i.e. the percentage of steel cross-section with respect to the global cross-section of the cable.
  • the steel wires preferably have a carbon content ranging between 0.10 and 0.70 %, most preferably between 0.30 and 0.50 %.
  • the lower limits are imposed by reasons of minimum tensile strength, the upper limits are imposed by reasons of sufficient ductility.
  • the yield strength of the steel wires in the heat-affected zones is usually at least ten per cent, e.g. at least thirty per cent, lower than the yield strength of the steel wires in the non-affected zones.
  • the tensile strength of the steel wires in the non-affected zones is preferably greater than 500 MPa, e.g. greater than 600 MPa, e.g. 800 MPa or 1050 MPa.
  • FIGURE 1 shows, by way of example, a cross-section of an electrical cable 10.
  • the electrical cable comprises a core 12 having electrical conductors 14 embedded in a matrix of synthetic material 16.
  • a plurality of flat steel wires 18 is wrapped around the core 12 and forms a layer around the core 12. This layer may, in its turn, be enveloped by an outer layer of synthetic material 20.
  • a transversal cross-section of the flat steel wires 18 can have a width (this is the greatest dimension in the cross-section) ranging from 4.0 to 10.0 mm and a thickness (this is the smallest dimension in the cross-section) ranging from 1.0 to 4.0 mm, the width-to-thickness ratio being preferably greater than 2.
  • Some examples are 7.5x2.5 mm, 7.5x3.0 mm, 8.0x3.0 mm, 9.0x3.0 mm wires.
  • the carbon content of these flat steel wires 18 can range between 0.10 and 0.70 %, and can be about 0.35 %.
  • the tensile strength of the flat steel wires 18 is preferably greater than 500 MPa and is e.g. about 1000 MPa.
  • the flat steel wires can be coated with a corrosion-resistant coating such as zinc or a zinc alloy, e.g. a zinc aluminium alloy comprising about 95 % zinc and about 5 % aluminium.
  • a corrosion-resistant coating such as zinc or a zinc alloy, e.g. a zinc aluminium alloy comprising about 95 % zinc and about 5 % aluminium.
  • This latter alloy of zinc-aluminium is particularly interesting, since it allows the wrapping of the thus coated flat or non-round steel wires around a core without chipping or flaking of the coating layer.
  • FIGURE 2 gives a global view of how the flat wires 18 are wrapped around the core 12.
  • Flat steel wires 18 are drawn from spools 22.
  • the spools 22 may have their axes fixed during the rotation around the core 12 or may have their axes rotated during the rotation around the core 12.
  • the flat steel wires 18 pass through holes 24 of a disc 26 and between a pair of rollers 28. This pair of rollers 28 is fixed by an angular plate 30 to the disc 26.
  • the flat wires pass through holes 32 of a second disc 34 and between a pair of rollers 36, which are fixed by an angular plate 38 to the second disc 34.
  • the flat wires pass through holes 40 of a third disc 42 and between a pair of rollers 44, which are fixed by an angular plate 46 to the third disc 42.
  • FIGURE 3 gives a more detailed view of this process.
  • a welding apparatus 50 may be positioned between the spools 22 and the first disc 26 in order to weld the trailing end of a length, e.g. at the end of a spool, to the leading end of a subsequent length of wire, which is e.g. at the beginning of a spool.
  • this welding operation results in a weld 52 and in a heat-affected zone 54 around the weld.
  • the rest of the wire lengths 56 are non-affected zones, i.e. zones where the tensile strength and the yield strength have remained substantially unchanged during the welding operation.
  • the flat wires are forced and subjected to a plastical torsion in a first direction between the first pair of rollers 28 and the second pair of rollers 36.
  • This particular angle of a plastical torsion is determined by the position the steel wire must take around the core of the cable.
  • the flat wires are forced and subjected to an elastical torsion in a second direction, opposite to the first direction, between the second pair of rollers 36 and the third pair of rollers 44.
  • This particular angle of an elastical torsion is determined empirically. Its value must be such that the helically twisted configuration given by the plastical torsion does no longer concentrate on the heat-affected zones, which reduces the frequency of fractures in the steel wires.
  • the thus deformed flat steel wires are brought toghether at a die 48 which eventually fixes the layer of flat wires 18 around the core 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Ropes Or Cables (AREA)
EP96200701A 1995-03-28 1996-03-14 Drahtverlegung rundum einer Seele Withdrawn EP0735546A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96200701A EP0735546A1 (de) 1995-03-28 1996-03-14 Drahtverlegung rundum einer Seele

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP95200769 1995-03-28
EP95200769 1995-03-28
EP96200701A EP0735546A1 (de) 1995-03-28 1996-03-14 Drahtverlegung rundum einer Seele

Publications (1)

Publication Number Publication Date
EP0735546A1 true EP0735546A1 (de) 1996-10-02

Family

ID=26139179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96200701A Withdrawn EP0735546A1 (de) 1995-03-28 1996-03-14 Drahtverlegung rundum einer Seele

Country Status (1)

Country Link
EP (1) EP0735546A1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3919135A1 (de) * 1989-06-12 1990-12-13 Norddeutsche Seekabelwerke Ag Verfahren und vorrichtung zur herstellung von kabeln, seilen etc.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3919135A1 (de) * 1989-06-12 1990-12-13 Norddeutsche Seekabelwerke Ag Verfahren und vorrichtung zur herstellung von kabeln, seilen etc.

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