DE6924075U - CONNECTED WIRE. - Google Patents

Description

DH. IXCJ. E. HOFFMANN DIrL-IXCi-W-EITLE · DH. HER. XAT. K. HOFFMANN '^

Ι'ΛΤΚ N 'TAN W A Ι / Γ K

D-8000 MÖNCHEN 81ARAB E LLASTRASS E 4 TELEPHONE (0811) 9110 87

Unidare Limited in Dublin / Ireland
λI composite wire d

^ The innovation relates to composite wires that

E.g. for electrical lines use that necessarily made of a material such as "... B. aluminum, which has a relatively low tensile strength, in conjunction with a material of relatively high tensile strength, for example steel wire, and thus are able to withstand the relatively large loads they are subjected to in use,

Such composite wires have been made in several ways, none of which prove to be entirely satisfactory

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proved. Thus, composite wires were made by surrounding a steel wire produced as a core with a number of aluminum wires, for example six wires around a core of the same diameter. Such composite wires are subject to corrosion when air and moisture penetrate between the individual wires can. Even if the steel core is galvanized and greased, corrosion can still occur due to the galvanic Effect between the zinc and the aluminum. The surface of the aluminum is subject to pitting, especially if it is is exposed to the action of seawater, although this is not critical as long as the cross-section of the aluminum is dimensioned relatively large. Try to surround the wires with polyvinyl chloride or the like to protect them from corrosion and galvanic exposure increased cost and resulted in a somewhat bulky product. Furthermore, problems have arisen due to defects in the coating or the like, as well as when there are two such pieces of wire should be united with each other.

A type of composite wire that would be very beneficial, particularly for use as an electrical conductor consist of a metal core with tensile strength, such as steel wire, around which, concentrically and preferably in close contact, a coating of a lower tensile strength metal, such as aluminum, of the required strength is applied to give the desired electrical conductivity. The overall diameter of such a conductor would be be minimal in relation to its exposed surface. The innovation creates a composite wire, which has an inner metal core of high tensile strength serving for reinforcement, for example a steel wire, which is surrounded by a longitudinal outer layer of lower tensile strength, for example made of aluminum,

the cross-section of the layer being at least four times that of the core. Preferably the Cross-sections of the layer and the core in a ratio of 5: 1 to 7: 1, in particular around 6: 1.

In a preferred embodiment, the Layer of a longitudinal metal strip that is wrapped tightly around the core so that it is flush with the surface the same or a previously applied coating is in close contact.

Furthermore, the innovation provides a method for producing such a composite wire, in which a substantially a trough-shaped metal strip is formed, on the bottom of which a metal wire of higher tensile strength is placed, and in which the edges of the trough-shaped strip are closed around the wire.

In the following description, for the sake of simplicity, the metal of the core is steel and that of the layer referred to as aluminum, although the innovation is of course not limited to the use of these materials. The layer could also consist of an aluminum or copper alloy, for example with cadmium.

This improved composite wire can be made in a number of ways. According to Art this can be done by first forming a strip of suitable cross-sectional shape from aluminum, which allows fold it around the steel wire, then the Steel wire is inserted into the strip, the strip is folded around the steel wire to enclose it, and finally the entire arrangement of aluminum and steel wire is post-treated to make the outer surface of the aluminum

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to smooth miniums and reduce its cross-section. Such an aftertreatment can include pressing, rolling or drawing, as well as a combination of such processes belong. Au.! ' this way the aluminum becomes solid with that Steel wire connected and forms a solid and permanent coating on the wire., Which is an extraordinary may correspond to good plating. In some cases or applications, however, such a connection may be established Abundance of aluminum strip with steel wire: g or even undesirable. It may be that the steel wire is made, for example, by electroplating or Applying an aluminum coating should be protected against corrosion before the aluminum strip is applied or that it is even surrounded by a protective layer of plastic or the like. Especially if If the wire is protected in this way, there is no need to firmly connect the edges of the aluminum strip. Otherwise can use the converging edges of the strip be connected to one another by welding, soldering or the like.

As stated, such a wire can be produced in various ways according to the invention. In a manufacturing method of the aluminum strips by slitting wire ⁵ of an aluminum rod (for example, in a. Rolling or scnstigen Fcrmvorgang) is formed, but this does not along a radial plane to such a depth is that the rod would be decomposed into two semi-circular pieces, after which the Wire is inserted into the base of the Schiit ze j and the slotted rod is closed around the Dra.-t around to enclose it - finally the crate can be pulled together with the wire through a die or iv.f any other mechanical processing,

: vlu: ^ .. ::. ■ ·. · _ ■■. Zl'üi.z r.erum zn shrink and the 3j: -I1c3u:. ^ Of the So: ".!.;'.: ■ s.; U νjllenden. Instead of pulling through a die or a number of A VJaIz- or pushing process can occur at the matrices.

Another manufacturing method is aluminum range, which may or may not have been rolled flat beforehand, deformed into a sickle-like cross-section, in turn Pulling into a Fortr. brought, in which one side is substantially semicircular, while the other side is arched trough-like, the steel wire is inserted into the trough cross-section and the sides of the latter closed over it. The wire thus formed is then treated to make its cross-section into the final circular one To bring shape. The aluminum can be annealed between any drawing steps, if so desired is.

However, the innovation is not limited to a production of the composite wire in which the steel wire into an aluminum rod or aluminum strip (the by rolling, casting or extrusion) is inserted, whereupon the aluminum is closed around the steel wire will. Rather, the steel wire can already be introduced into the aluminum layer during production by continuously passing it through the extrusion dies from which the aluminum is then already produced emerges with the enclosed steel core,

In order to improve the adhesion between the steel core and the aluminum layer, it can be advantageous to to use a steel wire the surface of which has been deliberately roughened, corded or notched. Additionally can the steel wire galvanized, coated with aluminum,

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anodized or otherwise protected against corrosion and then provided with a flux before the aluminum casing is applied in order to achieve the most intimate connection possible between the aluminum and the steel wire. Farther it can be advantageous to roughen the outer surface of the aluminum coating, to provide it with protrusions or notches, for example by passing the pre-formed composite wire between appropriately profiled rollers. The pattern can for example be helical or corrugated. It can be during or during extrusion of the aluminum the passage of the composite wire through dies in the course of manufacture. The composite wire thus treated can have improved aerodynamic properties compared to externally smooth wires of the same strength and current carrying capacity, where vibration problems can often be observed, provided that they are stretched out from the outside.

Some manufacturing methods of the composite wire according to the invention are detailed below with reference to the figures described, which are kept more or less schematic.

Fig. 1 shows the basic concept of a plant for production I. a composite wire according to the invention using rolling processes;

Figures 2 through 6 are enlarged cross-sections showing the roll profile;

7 shows a modified embodiment for the closing roller;

8 and 9 show schematic sections of a system for Production of the composite wire in the extrusion process;

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Pig. 10 to 12 are enlarged cross-sections of the aluminum profile, how it is formed by the matrices, and

Figures 13 through 18 are cross sections of the aluminum rod in sequence Rolling and spinning steps.

In Fig. 1 it can be seen how the bar material 1 made of aluminum from a drum 2 by means of feed rollers 3 is unwound and passed between forming rollers 4, which is a first shaping or calibration of the bar material effect, as indicated in FIG. The bar material 1 continues to run between pairs of rollers 5, 6 and 7, which, as can be seen from FIGS. 3, 4 and 5, are shaped are. The rollers 5 flatten the bar material 1 and at the same time give it a concave profile. The reels 6 give the strip thus formed a decidedly V-shaped profile, while the rollers 7 the same into a U-shaped convert of substantially constant wall thickness, the bottom of which is semicircular in shape, with its inner diameter essentially the diameter of the steel wire to be inserted and its outer diameter that of the finished one Compound wire corresponds.

When leaving the rollers 7, the trough-like strip thus formed runs to the point where the steel wire 10 of a Drum 9 is entered forth, and together with this on to the closing rollers 11, which, as can be seen from Fig. 6, the Close the edges 12 of the U-shaped trough profile around the wire 10, which is pressed firmly in the process. The rollers 11 leaves the composite wire with the desired end profile. Although the adjoining edges 12 of the aluminum strip, if desired, can be firmly joined together by the closing process, it deserves the preference between

First allow them a small epalt l ~ j> exist. This facilitates welding, because the wire 10 is then completely enclosed so that air and moisture cannot enter.

Fig. 7 shows a slightly modified shape of the closing rollers 11, of which four cooperate in this case . around the aluminum strip 1 around the wire 10 hot to close, with now a well-defined gap Ij? for the subsequent welding process or the like. It has proven advantageous to introduce a thin, adhesive plastic tape into the gap 13 and then the composite wire by another pair of closing rollers similar to the rollers 11 from. 6 to get in a final pressing process to enclose the plastic band in the gap I ^ and thus hermetically seal it.

It is noteworthy that the composite wire can be produced continuously by the method described can, as long as the supply of drums 2 and 9 is sufficient.

FIGS. 8 to 12 show a modified manufacturing method, in which the aluminum is shaped by extrusion instead of rolling.

Fig. 8 shows how a rod 21, the cross-section of which is given in FIg = 10 vri., Through a die 22 by means of A piston I9 is pressed out in a manner known for extrusion onto a heated aluminum mass 20 acts. The extruded trough-shaped aluminum profile can be wound onto a drum for temporary storage or fed directly to the next station where the wire 2j5 is inserted. Fig. 9 shows the

Trough-shaped aluminum rod 1, which is supported by a drum 24 through a guide block 26 in which the wire 23 from the drum 25 by means of a guide member 28 (Fig. 11) is pressed to the bottom of the trough profile, runs through it, and like the rod 21 with the wire 23 dara.uf together passes through a closing die 27, v / o the Aluminum sheath closed around wire 23 according to FIG. 12 and the composite wire undergoes its final smoothing and calibration.

If desired, the aluminum coating can also be shaped and applied partially by extrusion and partly by rolling or continuous casting. Suitable phases for such a procedure are shown in FIGS to 18 shown. Fig. I3 leaves the cross section of the original Detect the supplied aluminum bar material. This is smoothed by pulling through a first die and calibrated, as can be seen from FIG. This is followed by a flattening to the shape shown in FIG. 15 Hindu rchführur-g between rollers, as has essentially already been described in connection with FIG. A Another set of rollers finally produces the profile shown in FIG. 16, whereupon the aluminum material is replaced by a Die passes through which gives it the shape and dimensions according to FIG. As already described, the Steel wire brought to the bottom of the trough shape, whereupon the strip 10 using another die that the strip is given the shape according to FIG. 18, around the wire 1 is closed around.

As can be seen from the preceding description, the invention allows a continuous production method, the details of which may vary. For example, can the steel wire in the aluminum cladding already during their production in a, concentric extrusion or

Continuous casting are introduced. The so-called "vertical casting" ("down-casting"), as is already the case for the continuous production of bar material from aluminum Use., Is also suitable for the introduction of the steel wire in a casting process, after which the so formed Composite strand can be subjected to a YJaIz or drawing process directly, as described. If desired, the aluminum strand can also be cast with a trough-shaped cross-section so that only then can steel wire to record. This latter can be continuously introduced into the trough-shaped strand, the edges of which then are closed around the wire, whereupon the composite wire or strand the required rolling and / or drawing process is subjected to reduce the aluminum cross-section and the desired surface finish together with the permanent lock of the steel wire inside the aluminum cladding.

The invention makes it possible to coat the steel wire with a corrosion-resistant material, for example by electroplating, aluminum coating, enamelling or coating with a plastic or the like., by no means excluded before the aluminum coating is applied.

An electrical conductor for energy transmission systems can advantageously be formed in that a Number of composite wires according to the invention made of aluminum and steel are twisted together. Such a leader has the current carrying capacity in connection with the tensile strength and other properties that are required, to meet all demands.

The steel core of a composite wire according to the invention can consist of a single wire or a wire rope. Of course, there are other useful ones too

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Applications than that for electrical power transmission in question.

Claims (8)

- 12 protection claims 1. Boundary wire with an inner reinforcement Metal core of high tensile strength, for example steel wire, supported by a longitudinal outer sheath is enclosed from a material of lower tensile strength, for example aluminum, characterized in that the casing (1, 21) around the core (10, 23) is formed with a thickness that its cross section is at least four times the cross section of the core. 2. Composite wire according to claim 1, characterized in that the core (10, 23) from the sheath (1, 21) is tightly enclosed. 3. composite wire according to claim 1 or 2, characterized in that that the core is initially in a tight envelope, for example made of plastic, aluminum or the like., is surrounded or that it is anodized. 4. composite wire according to any one of the preceding claims characterized in that the envelope (1) consists of a longitudinal strip which is full around the core (10) is folded around to make intimate contact with it or a previously applied coating to surrender. 5. composite wire according to claim 4, characterized in that g e k e η η - ζ e i c h ne t that the longitudinal edges (12) of the strip (1) are sealed by welding. 6. composite wire according to claim 4, characterized in that the longitudinal edges (12) of the strip (1) are closed by a binding agent. 7. composite wire according to one of the preceding claims, characterized g e k e η η ζ e i c η η e t that di- surface of the Kernes (10, 2j5) roughened, corded or ^ e '-'. Is inherited. 8. composite wire according to one of the preceding claims, characterized in that the outer surfaces the casing (1., 21) is roughened, provided with projections and each is notched.