EP0725852B1 - Process and device for producing steel cord - Google Patents

Abstract

The invention relates to a process and device for producing steel cord, in particular high tensile and ultra-high tensile strength cord. The aim of the invention is to provide for a high-quality production of in-out stranded wire with a core wire made of high tensile and ultra-high tensile wires, where large-scale spool fillings can be processed at an acoustic level of < 80 dB. This is accomplished in that a) the wires (8; 8') are drawn off at constant tension over the entire spool filling from mechanically brakable supply spools (2; 2') that are mounted essentially within a spool frame (1a) and that have a filling weight of > 50 Kg, and, through a glide and roll-off movement on a conical reversing sheave (7) at a single stranding point (9), the wires are stranded in a double twist to the structurally finished stranded wire (15); b) the structurally finished stranded wire (15) rotates about itself in passing through two synchronously rotating flyers (13a, 13b) at double the rotational speed of the flyers (13a, 13b); c) the individual wires (8; 8) are subjected to a predeformation before they pass into the stranding point (9); d) the structurally finished stranded wire (15) is subjected to a plastic deformation by overtwisting in the region between the stranding point (9) and the conical reversing sheave (7); e) the overtwist speed and the flyer speed are mutually adjusted at the same rotational speed ratio over the entire stranding process, including start-up as well as braking phase; f) to reduce its inner torsional tensions prior to being wound up, the stranded wire (15) is subjected to a defined increase in tensile force and to one or more overtwist and reforming processes and finally delivered at a constant take-up force to a controlled take-up stand (5).

Description

The invention relates to a method and an apparatus for Production of steel cord, especially HT cord or ultra HT cord (Ultra-high tensile strength steel tire cord).

It is known to use double twist stranding machines of steel wires. From DE 24 62 092 A1 a machine is known in which the individual flow coils axially aligned arranged one behind the other between gear stands are. Every single wire is handled by roller systems the coils are guided around in the middle of the axis of the rotor and from passed through a bearing journal to the next coil frame, where he with the wires coming in the previous described way is forwarded. Be at the end of the rotor the wires via a pulley rotating synchronously with the rotor deflected in the opposite direction and in a sinusoidal Curve around the coils to the other end of the rotor guided. Outside the stranding system are an overturning device to eliminate the through the double twist stranding large torsional stresses present in the strand as well as a Trigger and rewinder arranged. The first stranding point is in the area of the first pulley and the second stranding point to realize the double stroke is at the outlet the stranding machine. With this known machine, however only hollow strands can be produced in accordance with quality. For This machine is producing stranded wire with a core wire not suitable, because the core wire during the stranding Maintains approximately the same length and therefore longer than the wires of the Is the top layer, which is shortened by the second stranding and as a result causes an adverse deformation of the strand. Furthermore, the winding of the finished steel wire strand requires a high operating effort, because a constant change of bobbins Winding reel by the operator is necessary. The coil volume of all payout coils is usually a multiple of the spool volume of the take-up spool.

EP 0 563 586 A1 describes a method and a device known for the production of high-strength steel wire strands.

In the process, the individual wires are from the inside a spool frame arranged, brakeable spools subtracted and stranded according to the double lay principle and the Steel wire strand is laid on using a laying device Coils wound, each a much smaller one Take up capacity than the payout spools.

The wires drawn off with the same tension are thereby due to a sliding movement on a conical pulley in a single stranding point in double stroke to that in your Structure manufacture steel wire stranded. The one in their structure The finished steel wire strand rotates when two pass through synchronously rotating flyers at twice the speed of the flyer to yourself and before it unwinds becomes a breakdown of yours internal torsional stresses a post-forming process and a subject to a defined increase in tractive force.

The device consists of a double twist stranding machine with several stored in the coil frame and one each Wire brake braked decoilers, a subordinate Strand trigger and a rotary driven and laterally movable Spool package with interchangeable take-up spools and one Laying device.

Here is in the area of the first deflection point of the stranded material a conically shaped pulley in the center axis arranged and in the area between the reel spool and pulley a common stranding point for the first and the second Twisted lay arranged. On each face of the coil frame is a flyer with a management link for the little one Diameter of the conical deflecting steel wire strand rotatably mounted and arranged between the outlet side second flyer and the coil package is a device arranged to reduce the torsional stress in the steel wire strand.

However, it is not possible with the known method and the Device a steel cord of the highest tensile strength, in particular Manufacture HT-Cord and Ultra-HT-Cord according to quality. Furthermore the device according to EP 0 563 586 A1 is not suitable, a running time with a 24 hour rhythm realize, because this rhythm requires a high coil mass and this mass according to the known method and with the known Device not with the required accuracy moved and therefore the wires to be stranded not with the required low tension can be handled. As a result, wire cracks are possible, which affect the quality of the Good things to twist and negatively influence the twisting regime.

The invention is based, a method and a task Device for the production of steel cord, in particular HT cord and ultra-HT cord, whereby it is possible to create the principle of in-out wire strands with a core wire made of HT and Manufacture ultra-HT wires to quality, with large ones Coil fillings can be processed at a sound level <80 dB are.

a) die Drähte von im wesentlichen innerhalb eines Spulenrahmens angeordneten, mechanisch abbremsbaren Ablaufspulen mit einer Füllmenge > 50 kg über die gesamte Spulenfüllung mit konstanter Spannung abgezogen und infolge einer Gleit- und Abwälzbewegung auf einer konischen Umlenkrolle in einem einzigen Verseilpunkt im Doppelschlag zu der in ihrer Struktur fertigen Drahtlitze verseilt werden,

b) die in ihrer Struktur fertige Drahtlitze bei Durchlaufen von zwei synchron zueinander rotierenden Flyern in doppelter Drehzahl der Flyer um sich selbst rotiert,

c) die einzelnen Drähte vor Einlauf in den Verseilpunkt einer Vorverformung unterworfen werden,

d) die in ihrer Struktur fertige Drahtlitze im Bereich zwischen dem Verseilpunkt und der konischen Umlenkrolle einer plastischen Umformung durch Überdrehung unterworfen wird,

e) die Überdrehzahl und die Flyerdrehzahl über den gesamten Verseilprozeß einschließlich Anlauf- und Abbremsphase im gleichen Drehzahlverhältnis zueinander geregelt werden,

f) die Drahtlitze vor ihrem Aufwickeln zum Abbau ihrer inneren Torsionsspannungen einem definierten Zugkraftanstieg und einem oder mehreren Überdreh- und Nachformvorgängen unterworfen wird und abschließend mit gleichbleibender Aufwickelkraft einem geregelten Aufwickler zugeführt wird.

According to the invention the object is achieved in that

a) the wires are withdrawn from a mechanically brakable drainage spool with a filling quantity> 50 kg arranged essentially within a spool frame over the entire spool filling with constant tension and as a result of a sliding and rolling movement on a conical deflection pulley in a single stranding point in a double stroke to that in it Structure finished wire strand are stranded

b) the wire strand, which is finished in its structure, rotates around itself at two speeds when two flyers rotating synchronously to one another pass through it,

c) the individual wires are subjected to a pre-deformation before entering the stranding point,

d) the structure of the stranded wire in the area between the stranding point and the conical deflection pulley is subjected to plastic deformation by overturning,

e) the overspeed and the flyer speed are regulated over the entire stranding process including the start-up and braking phase at the same speed ratio to each other,

f) the wire strand is subjected to a defined increase in tensile force and one or more overturning and post-forming processes before it is wound up in order to reduce its internal torsional stresses and is finally fed to a controlled rewinder with a constant winding force.

a) die von den Ablaufspulen mit konstanter Zugkraft abgezogenen Drähte auf den größten Durchmesser der konischen und im ersten Umlenkpunkt des Verseilgutes angeordneten Umlenkrolle auflaufen und während ihrer Umlenkung auf der Umlenkrolle zum kleineren Durchmesser hin abgleiten und dadurch in Drehung versetzt werden,

b) die Drähte vor Einlauf in den Verseilpunkt mittels feststehender Vorformnippel oder Vorformrollen, um die der jeweilige Draht geführt wird, vorgeformt werden,

c) die Drähte zwischen der Umlenkrolle und den Ablaufspulen in einem Verseilpunkt den ersten und zweiten Verseilschlag gemeinsam erhalten,

ca) im Anschluß daran die in ihrer Struktur fertige Drahtlitze einer plastischen Umformung mittels einer Dralliereinrichtung unterworfen wird,

cb) die ihrerseits in gleicher Richtung wie die Flyer, jedoch je nach gewünschtem Verseilaufbau mit der 1,8 bis 1,95fachen Drehgeschwindigkeit der Flyer, rotiert,

d) die in ihrer Struktur fertige Drahtlitze zur Erhaltung der Verseilstruktur von dem dem Spulenrahmen vorgeordneten ersten Flyer in freier Flugkurve zu dem nachgeordneten zweiten Flyer geführt wird,

e) die inneren Torsionsspannungen der Drahtlitze in einem Doppelscheibenabzug, welcher einen Durchmessersprung zum größeren hin aufweist, in einer oder mehreren gesondert angetriebenen Überdreheinrichtungen, die eine zu den Flyern der Doppelschlagverseilmaschine entgegengesetzte Drehrichtung aufweisen und je nach gewünschtem Verseilaufbau mit der 0,3 bis 1,0fachen Drehzahl rotieren sowie in einer oder mehreren Nachformeinrichtungen abgebaut werden,

f) die torsionsspannungsfreie Drahtlitze über eine Verlegeeinrichtung einem tänzergeregelten Aufwickler zugeführt wird.

A preferred embodiment is that

a) the wires drawn off from the pay-off spools with constant tensile force run onto the largest diameter of the conical deflection roller arranged in the first deflection point of the stranded material and slide during their deflection on the deflection roller towards the smaller diameter and are thereby set in rotation,

b) the wires are preformed before entering the stranding point by means of fixed preform nipples or preform rollers around which the respective wire is guided,

c) the wires between the deflection roller and the pay-off spools receive the first and second stranding twist together at one stranding point,

ca) the wire strand, which is finished in its structure, is then subjected to a plastic deformation by means of a twisting device,

cb) which in turn rotates in the same direction as the flyer, but depending on the desired stranding structure at 1.8 to 1.95 times the rotation speed of the flyer,

d) the structure of the wire strand finished to maintain the stranding structure is guided from the first flyer upstream of the coil frame in a free flight curve to the second flyer downstream,

e) the inner torsional stresses of the wire strand in a double-disc take-off, which has a jump in diameter towards the larger one, in one or more separately driven overturning devices which have a direction of rotation opposite to the flyers of the double-twist stranding machine and, depending on the desired stranding structure, with 0.3 to 1, Rotate 0 times the speed and be dismantled in one or more post-forming devices,

f) the torsion-free wire strand is fed to a dancer-controlled rewinder via a laying device.

In the solution according to the invention, the second twist with HT and Ultra-HT wire in the area of the flight curve not easily realized, the stranding on one Place concentrated in the area in front of the first deflection roller, whereby the management of the association or the strands is designed in such a way that the entire dressing rotates around itself, with double Speed of the rotor. The stranding association has already in the area double speed between the take-off spool and the pulley (Stranding speed) of the rotor, so that the stranding assembly immediately after the pulley over its final Twist (double) and on the way to second pulley is only guided and maintained. Advantageously this is done via the conically shaped pulley. So that the individual wires withstand the loads during the Withstand stranding better, these are before entering the Stranding point subjected to pre-deformation.

Furthermore, it is advantageous to have the geometrically finished bandage between stranding point and conical shaped pulley to overturn using a twisting device. The association undergoes a plastic deformation. The same happens in Area between take-off and rewinder using overturning devices.

Here, the core wire can be a single wire or a core strand of one or more arranged in front of the coil frame Take off spools and over the rotating synchronously Flyer in the area of the arranged in the coil frame Run rollers and with running out of those who Strand wires forming wires common in the stranding point run and stranded there.

It is preferred to achieve a low wire tensile force each wire, coming from the respective spool, before entry into the preform in several turns Roller system in the form of a pulley.

The coils are expediently used to achieve the almost constant traction by a dancer-controlled The wire brake is braked, the brake disc of which is chrome-plated, ground and polished braking surface with a roughness <3.2 µm and which are operated by the dancer arrangement Brake shoes of a brake band a friction lining made of tetrafluoroethylene with 10 to 35% carbon content.

It is also possible that after the plastic Forming additionally applied a wire helix to the wire strand , the resulting winding tensions subsequently be dismantled by a post-forming device.

The solution according to the invention includes that the wires from One-hour reels or a multiple of which the double twist stranding machine can be subtracted.

The stranded wire strand is produced in a corresponding manner a take-up reel or a take-up reel package one in 24 hour rhythm or a multiple of them working Rewinder fed.

a) eine Doppelschlagverseilmaschine mit mehreren, im wesentlichen in einem Spulenrahmen gelagerten und durch je eine Drahtzugbremse abgebremsten Ablaufspulen, bei der im Bereich des ersten Umlenkpunktes des Verseilgutes in der Mittelachse der Doppelschlagverseilmaschine eine konisch geformte Umlenkrolle angeordnet ist und im Bereich zwischen den Ablaufspulen und der Umlenkrolle in Ablaufrichtung des Verseilgutes nacheinander eine Vorformeinrichtung, ein gemeinsamer Verseilpunkt für den ersten und zweiten Verseilschlag und eine Dralliereinrichtung angeordnet sind sowie an jeder Stirnseite des Spulenrahmens ein Flyer mit je einem Führungselement für die vom kleineren Durchmesser der konischen Umlenkrolle ablaufende Drahtlitze drehbar gelagert ist und die synchron zueinander drehenden Flyer und die Dralliereinrichtung über den gesamten Verseilprozeß einschließlich Ablauf- und Abbremsphase zueinander das gleiche Drehzahlverhältnis aufweisen,

b) einen der Doppelschlagverseilmaschine nachgeordneten, einen definierten Zugkraftanstieg realisierenden Doppelscheibenabzug,

c) eine oder mehrere in Ablaufrichtung der Drahtlitze nacheinander angeordnete Überdreheinrichtungen und Nachformeinrichtungen,

d) einen geregelten Aufwickler mit einer Verlegeeinrichtung.

In a further embodiment, the invention comprises a device for carrying out the method for producing steel cord, in particular HT and ultra-HT cord, which comprises:

a) a double-twist stranding machine with a plurality of spools, essentially mounted in a spool frame and braked by a wire pull brake, in which a conically shaped deflection pulley is arranged in the area of the first deflection point of the stranded material in the central axis of the double-strand stranding machine and in the area between the spools and the deflection pulley A preforming device, a common stranding point for the first and second stranding twist and a twisting device are arranged one after the other in the direction of discharge of the stranded material, and a flyer with a guide element for the stranded wire running off the smaller diameter of the conical deflection roller is rotatably mounted on each end of the spool frame and is synchronously mounted the rotating flyer and the twisting device have the same speed ratio to one another over the entire stranding process including the running and braking phase,

b) a double-disc take-off downstream of the double-twist stranding machine and realizing a defined increase in tensile force,

c) one or more overturning devices and post-forming devices arranged one after the other in the direction of the wire strand,

d) a regulated rewinder with a laying device.

It is particularly advantageous here that between each payout spool and the associated preforming device a roller system is arranged in the form of a pulley, over which the each running wire is guided in several turns.

By arranging such a roller system between each reel spool and the preform in the form of a pulley, over which each wire is passed, there is Possibility of winding spools with large spool filling and thus large mass to use. With high coil braking forces can low and constant wire tensile forces over the entire coil filling be realized that a wire break during the stranding process exclude.

a) jede Drahtzugbremse ein mit einem Schwenkhebel einer Tänzerrolle gekoppeltes Bremsband, bestehend aus einer beliebigen Anzahl Bremsbacken mit einem Reibbelag aus Tetrafluorethylen mit 10 bis 35 % Kohlenstoff sowie eine mit der Ablaufspule drehfest verbundene Bremsscheibe aufweist, deren verchromte, geschliffene und polierte Bremsfläche eine Rauheit < 3,2 µm hat,

b) die Vorformvorrichtung für die Behandlung eines jeden Drahtes in Abhängigkeit vom jeweils zu verseilenden Draht entweder je einen feststehenden Vorformnippel oder je eine Vorformrolle, um die der jeweilige Draht geführt ist, aufweist,

c) die Dralliereinrichtung ein Rollensystem aufweist, um welches die in ihrer Struktur fertige Drahtlitze geführt ist, welches die gleiche Drehrichtung, jedoch je nach gewünschtem Verseilaufbau die 1,8 bis 2,lfache Drehgeschwindigkeit der Flyer, aufweist,

d) dem Doppelscheibenabzug, der mit einem Durchmessersprung zum größeren hin ausgebildet ist, eine oder mehrere Überdreheinrichtungen, die die entgegengesetzte Drehrichtung, jedoch die 0,3 bis 1,0fache Drehgeschwindigkeit der Flyer aufweisen sowie eine oder mehrere Nachformeinrichtungen nachgeordnet sind,

e) der Aufwickler mit einer einzigen Aufwickelspule oder einer Aufwickeleinrichtung zur Aufnahme eines drehangetriebenen und seitlich verfahrbaren Spulenpaketes mit mehreren, axial nebeneinander angeordneten Aufwickelspulen ausgeführt ist.

An advantageous embodiment of the device is that

a) each wire brake has a brake band coupled to a swivel lever of a dancer roll, consisting of any number of brake shoes with a friction lining made of tetrafluoroethylene with 10 to 35% carbon as well as a brake disc rotatably connected to the payout spool, the chrome-plated, ground and polished brake surface of which has a roughness < 3.2 µm,

b) the preforming device for the treatment of each wire, depending on the wire to be stranded in each case, has either a fixed preform nipple or a preform roll around which the respective wire is guided,

c) the twisting device has a roller system around which the finished strand of wire is guided, which has the same direction of rotation but, depending on the desired stranding structure, 1.8 to 2 times the speed of rotation of the flyer,

d) the double-disc take-off, which is designed with a jump in diameter towards the larger one, one or more overturning devices which have the opposite direction of rotation, but have the 0.3 to 1.0 times the speed of rotation of the flyers, and one or more post-forming devices are arranged downstream,

e) the rewinder is designed with a single take-up spool or a take-up device for receiving a rotationally driven and laterally movable spool package with a plurality of take-up spools arranged axially next to one another.

There is a possibility that one or more run-off rolls for holding the core wire in the form of single wires or a core strand are arranged in front of the coil frame.

A dancer control is preferably assigned to the rewinder, the dancer preferably in the area after the last treatment the wire strand is arranged.

It is also advantageous, in particular to reduce the Noise generation that the flyers are conical and the guide elements are completely covered are, which has slots for the passage of the wire strand. Here, the leadership links can serve as leadership roles or guide nipple.

Another useful training is that the double twist machine with swirl device and the Deduction of a common main drive, the overturning device own drive and the rewinder a separate, dancer-controlled Drive are assigned and the main drive and the drive the overturning device via a regulating and control device are interconnected.

In the aforementioned preform device, the preform nipple has preferably a preform radius that is 10 to 15 times corresponds to the wire diameter.

The radius of the preform rollers is preferably about the 20th up to 30 times the wire diameter.

There is a further embodiment of the solution according to the invention in that between the double disc trigger and the dancer Device for applying a coil is arranged.

The device is preferably designed as a spiral winder, the winding head and the winding shaft of the spiral winder are arranged vertically as well as the winding head shaft elastic on the winding head side in a deeply coordinated system and on the drive side by means of a radially stiff, but rotor elastic support disc is mounted and the storage of the Winding head shaft is axially preloaded by means of disc springs.

The amount of the running wires expediently corresponds to the amount of stranded wire and both unwind spools as well as the take-up spools or the package of coils such a capacity that the double twist stranding machine at optimal speeds in a 24-hour rhythm or a multiple of it works.

For vibration-free work with low noise to achieve the double twist stranding machine via elastic elements in a free on the machine hall floor standing box profile be stored.

With the solution according to the invention, it is possible to use a wide one Manufacturing program including wire strands with core wire HT and Ulta-HT wires in accordance with quality in cross-country skiing manufacture and the demands of the user industry for simpler Operation of several stranding machines by one operator to be fulfilled by constantly changing the off and on Winding spools are omitted during the entire stranding process can be and thus economically favorable shift regime can be realized.

Fig. 1

die Vorderansicht der Vorrichtung in schematischer Darstellung,

Fig. 2

die Seitenansicht einer dem Verseilpunkt nachgeordneten Umlenkrolle,

Fig. 3

die Vorderansicht des Spulenrahmens nach Fig. 1,

Fig. 4

die Draufsicht auf ein der Drahtzugbremse nachgeordnetes Rollensystem für einen von der Ablaufspule abgezogenen Draht in schematischer Darstellung,

Fig. 5

die Seitenansicht eines Doppelscheibenabzuges für die Litze in schematischer Darstellung,

Fig. 6

die Vorderansicht eines Ausschnittes der Vorrichtung nach Fig. 1 in einer geänderten Ausführungsform,

Fig. 7

die Vorderansicht einer Vorformvorrichtung nach Fig. 1,

Fig. 8

die Vorderansicht einer Vorformvorrichtung nach Fig. 1 in der geänderten Ausführungsform,

Fig. 9

die Vorderansicht eines Flyers mit Führungselement,

Fig. 10

die Vorderansicht eines Spiralwicklers nach Fig. 6,

Fig. 11a bis Fig. 11d

die Vorderansicht von Konfigurationen der Vorrichtung mit Draht- und Litzenläufen.

The invention is described in more detail in an exemplary embodiment. In the accompanying drawing:

Fig. 1

the front view of the device in a schematic representation,

Fig. 2

the side view of a deflection roller downstream of the stranding point,

Fig. 3

the front view of the coil frame of FIG. 1,

Fig. 4

the plan view of a roller system arranged downstream of the wire pull brake for a wire drawn off from the payout spool in a schematic illustration,

Fig. 5

the side view of a double disc trigger for the strand in a schematic representation,

Fig. 6

1 shows a front view of a section of the device according to FIG. 1 in a modified embodiment,

Fig. 7

1 shows the front view of a preforming device according to FIG. 1,

Fig. 8

1 in the modified embodiment,

Fig. 9

the front view of a flyer with guide element,

Fig. 10

6 shows the front view of a spiral winder according to FIG. 6,

11a to 11d

the front view of configurations of the device with wire and wire barrels.

In Fig. 1, a device is shown, which is a double-stranding machine 1 and a double disc trigger 4, one or more, in the downward direction of the wire strand 15 produced successively arranged overturning devices 21 and post-forming devices 23 and a controlled rewinder 5 with a Laying device 6 has.

The double-twist stranding machine 1 is rotating Provide system in which several pay-off spools 2 each with one Wire brake 3 mounted in a common coil frame 1a are. The coil frame la is via end pivot 1b; 1c, which can be hollow around a central axis M pivoted but rotates due to its own weight not during the stranding process.

One or more further payout spools 2 'can each be used a wire brake 3 'and a roller system 10' in front of the coil frame la be arranged. From this payout spool 2 ' the core wire 8 'of the wire cord to be produced is withdrawn. This core wire 8 'can also be one of several individual wires existing core strand. The core wire 8 'runs along the central axis M to the pivot 1b and via a deflection roller 1d to a guide element 14a in the area of the Flyer 13a arranged at the front end of the coil frame la. From there the core wire 8 'runs in a free flight curve to one Guide element 14b one in the region of the rear end of the Coil frame la arranged flyer 13b. Via one of the pivot lc assigned deflection roller le, the core wire 8 'in the Area of the spools 2 out.

In the area of the central axis M is on or in the front pivot 1b a conical deflection roller 7 is mounted, the longitudinal axis of which runs essentially perpendicular to the central axis M. This deflection roller 7 forms a first deflection point for the the payout spools 2; 2 'and from the wires 8 and the core wire 8 'existing stripped stranded material, since - as in FIG. 2 shown - runs on their largest diameter portion and during the deflection on their jacket to the narrower end part slides down under a self-rotation. This tells them Stranded a complete stranding and forms a wire strand 15, the first and second stranding in one Stranding point (Fig. 3) can be combined.

As shown in Fig. 1, each of the respective payout spools 2 drawn wire 8 over a radially inner one Roller system 10 in the form of a pulley system with an internal one Actuating roller 3b of a wire brake 3 (Fig. 3) guided. A more detailed description is given below with reference 3 and 4. All of the payout spools 2 Wires 8 run here in a slight lateral Distance to the central axis M to the stranding point 9 and beyond preferably as a wire strand 15 along the central axis M. through the hollow pivot 1b to the wider end part the conical pulley 7.

The section between the payout spools 2 and the deflection roller 7 points, as shown in Fig. 3, in the direction of the stranded material successively a preform device 11, the common Stranding point 9 for the first and second stranding twist and a swirl device 12.

The preforming of the individual wires 8 is necessary for them withstand the stresses of the stranding process better. It the so-called "stiffness" is removed from the wires 8.

7 and 8 are different embodiments of the Preforming device 11 for the wire 8 shown. These are in Dependence on the wire quality to be processed as well as the wire diameter to be processed.

In Fig. 7 is a preform device 11 with a fixed Preform nipple lla shown. Each preform nipple lla has a preform radius that is 10 to 15 times corresponds to the diameter of the wire 8 to be processed.

8 is a preform device 11 with a preform roller 11b, around which the respective wire 8 is guided. The preform roller 11b has a radius that the 20 to 30 times the diameter of the wire 8 corresponds.

The wire 8 is after passing through the roller system 10 passed through the preforming device 11 and then runs in the stranding point 9, where it with the other wires 8 and the core wire 8 'receives the first and second stranding.

The geometrically finished stranding assembly coming from stranding point 9 is turned by means of the twisting device 12 (FIG. 3), hence its structure during the continuation maintains the rewinder 5. It is a plastic deformation to be recorded. The twisting device 12 rotates in the same Direction and depending on the desired stranding structure with the 1.8 up to 1.95 times the rotation speed of the flyer 13a; 13b the Double twist stranding machine 1.

As already stated, there is a front end of the coil frame 1a a flyer 13a; 13b on the pivot 1b; 1c stored the each a conical bracket with one arranged on the edge Deflection or guide element 14a; 14b in the form of a Roll or have a nipple.

In Fig. 9, the upper part of the front is conical Flyers 13a shown. The guide element 14a for the Wire strand 15 is completely enclosed by a covering 14c. In this are for the passage of the wire strand 15th Slots 14d arranged. The flyer 13b is designed accordingly. This particular embodiment of the flyer 13a; 13b leads to an advantageous noise reduction and improvement of the Performance parameters of the double twist stranding machine 1.

The pulled off from the narrower end part of the deflection roller 7, now in its structure finished wire strand 15 runs to the guide element 14a of the first flyer 13a and of this in free Flying arch over the guide element 14b of the second flyer 13b to one mounted in the pivot lc transversely to the central axis M. Deflection roller 15. The two flyers 13a; 13b are shared over gears known per se, for example toothed belt gears, driven synchronously by a drive motor, not shown, the conical bearing mounted in or on the pivot 16 Deflection roller 7 together with the flyer 13a around the central axis M rotates.

3 is a coil frame la with the take-off rollers 2nd and the associated wire brake 3 and the roller system 10 shown in more detail.

The wire brake 3 is a so-called dancer-controlled Brake executed and has a two-armed pivot lever 3a on, on one arm the looped by the running wire 8 Actuating roller 3b is mounted and on its other End engages a spring element 3c. The actuating roller 3b supporting arm is via a linkage 17 with a brake band 18, consisting of brake shoes 19, connected, the brake pad against the braking surface of a fixed on the shaft of the spool 2 Brake disc 20 presses. The braking surface of the brake disc 20 is preferably chrome-plated, ground and polished and shows a roughness of less than 3.2 µm. The brake or friction lining the brake shoe 19 suitably consists of tetrafluoroethylene a carbon content of about 10 to 35%.

As already described above, the wire brake 3 assigned a roller system 10 in the form of a pulley. The is on the pivot lever 3a mounted actuating roller 3b at the same time a component of the roller system 10.

The wire 8 is fed to the roller system 10 via this. He passes through this, as shown in Fig. 4, in several turns.

By guiding the wire 8 over the roller system 10 in several turns is achieved with large coil masses and thus large pulling forces, the wire pulling forces over the entire Coil filling kept low and constant and therefore also very thin wires 8 can be processed.

There are spools 2; 2 'can be used with a filling quantity> 50 kg. This means that steel cords can be used for quality in cross-country skiing are manufactured.

The already finished when they entered the first flyer 13a structured wire strand 15 remains in the structure in the area the free flight curve between the two flyers 13a; 13b received and is when leaving the stranding machine 1 on the around the central axis M rotating pulley 16 in the double disc trigger 4 introduced.

5, the double-disc trigger 4 is shown in more detail. He has two axially parallel rollers arranged at a distance from each other 4a; 4b. The roller 4a with circumferential grooves 4c be provided, while the roller 4b has a step 4d. The Wire strand 15 runs in several orderly loops around the two rollers 4a; 4b, level 4d jumping from one caused smaller to larger roll diameter. Hereby there is a defined increase in tractive force due to the torsional stresses be broken down in the wire strand 15.

For further complete reduction of internal tensions and Maintaining the stranding of the stranded wire 15 is the double-disc take-off 4, as shown in Fig. 1, another, separately driven overturning device 21 arranged downstream. This The overturning device 21 points to the flyers 13a; 13b the Double twist stranding machine 1 opposite direction of rotation and rotates with the 0.3 to 1.0 times the rotational speed of the flyer 13a; 13b. The overturning device 21 is separated from the by a drive 26 Double twist stranding machine 1 driven. The regulation of this Drive 26 takes place in dependence on the not shown Main drive for the double twist stranding machine 1 and the double disc trigger 4 by a regulating and control device 27. This also controls the direction of rotation and rotational speed of the overturning device 21.

Following the overturning device 21, the wire strand 15 via deflection rollers 22 of one or more post-forming devices 23 supplied at least one row in a row have straightening rolls arranged with mutual displacement, their mutual transfer according to the respective product and Operating conditions can be set. The wire strand 15 runs in a wave-shaped path over the straightening rollers, and the resulting bending and flexing effects there is a voltage reduction and position corrections of the wires 8 the wire strand 15.

Then the wire strand 15 is over pulleys 22 and the roller 4a of the double disc trigger 4 to a weight-loaded Dancer arm 24 with a deflection roller 25 and over a laying device 6 to a by a drive 5a separately driven rewinder 5 out. The dancer arm 24 is electrically connected and realized with the rewinder 5 by means of a contactless measuring element, not shown the control of the winder speed and thus the winding force.

The rewinder 5 either has a single take-up reel 38 or a laterally movable bobbin 39, the winding spools 38 are arranged axially next to each other.

The guidance of the wire strand 15, from the double-twist stranding machine 1 coming, takes place in the direction of the arrow along the Guide sections a to m.

6 shows a further embodiment of the device in FIG the area between the double disc take-off 4 and the rewinder 5 shown. In this embodiment, the wire strand runs 15, coming from the double twist stranding machine 1, along the Guide section a in the manner described above on the double disc trigger 4 along the guide sections b; c. Subsequently the wire strand 15 runs along the guide section d via a deflection roller 22 through the overturning device 21 and then over further deflection rollers 22 through the in the guide sections e; f arranged post-forming devices 23. About further guide sections g; h and pulleys 22 runs Wire strand 15 now in a guide section i in one vertically arranged spiral winder 28 with a coil is applied. The generated spiral voltages are in a subordinate, lying in a guide section k Postforming device 29 dismantled. Then it runs through Wire strand 15 over the roller 4a of the double disc trigger 4, the pulley 25 on the dancer arm 24 and other pulleys 22 and the laying device 6, the guide sections 1 to p until the finished product in the rewinder 5 on a Winding reel 38 or a package 39 of coils is applied.

10, the spiral winder 28 is shown in more detail. This has a winding head 30 with a flyer 31 and a winding head shaft 32 on. The winding head shaft 32 is on the winding head side in a deeply tuned system elastic in bearings 33 and on the drive side by means of a radially stiff, but rotor elastic support plate 34 (angular offset possible). The winding head shaft 32 is supported by means of Disc springs 35 axially preloaded.

In this way, the spiral winder 28 is free of play and self-centering educated.

Another embodiment of the device is that the Double twist stranding machine 1 via elastic elements 36 in a box profile standing freely on the machine hall floor 37 is stored. So that even with payout spools 2 with a Filling weight> 50 kg a vibration-free work and a Noise level below 80 dB reached.

The core wire 8 ′ is, as in the exemplary embodiment, based on 1, of one or more outside the Coil frame la arranged spools 2 'deducted. It is but also possible that the core wire 8 'in a known per se Way of a payout spool 2 arranged in the spool frame 1 a is subtracted.

11a to 11d are configurations of the device shown with wire and wire runs.

However, the scope of the invention is not limited to these examples limited.

In Fig. 11a are two spools according to the program 2 + 2 2 'for the core wire 8' before rotating in the System of the double twist stranding machine 1 (Fig. 1) arranged Delivery spools 2 are provided. The core wires 8 'run into that rotating system and are with the in the coil frame la (Fig. 1) arranged spools 2 running wires 8th stranded. After the wire strand 15 to dismantle its inner Torsional stresses a defined increase in tensile force and a or several overturning and postforming processes as described, is subjected to, the finished steel cord with constant Winding force supplied to the controlled rewinder 5.

In Fig. 11b are the two according to the program 2 + 3 Drain coils 2 'in the rotating system three drain coils 2 assigned for the wires 8. The procedure is above described.

In Fig. 11c is a spool according to the program 3 + 6 2 'arranged in front of the rotating system. Of this The spool runs a core strand, which consists of three together stranded individual wires, starting from, as at the beginning of the embodiment, also as a core wire 8 '.

In the rotating system are six spools 2 each a wire 8, two parallel to each other lie, arranged. The stranding is carried out as described above.

In Fig. 11d there are several variants in the program 3 + 9 + 1 shown.

In the first variant, there are ten spools in the rotating system 2 arranged, two in parallel side by side lie. Thereof is a payout spool 2 with the core strand, consisting of three individual wires, wound. The remaining nine coils are wound with a single wire each. The resulting rope bandage is then used as shown 6, with a spiral winder 28 on the Wire strand 15 applied a coil consisting of a wire. The finished steel cord is then placed on the regulated one Rewinder 5 applied.

In a second variant, which is dashed in FIG. 11d is, as in FIG. 11c, a payout spool 2 ' arranged in front of the rotating system, and from this runs the Core strand.

Other variants, not shown, are also possible.

This machine configuration is also suitable for stranding programs, where individual places for payout spools 2 are not occupied are.

A program 3 + 6 is mentioned as an example. With such a The program runs from three individual wires stranded together existing core strand from the outside of the rotating Systems arranged payout spool 2 '. Inside the rotating Systems are in the spool frame la (Fig. 1) six spools 2 wound with a single wire each. Four of the payout spools 2 remain free. The procedure is then like previously described.

The solution described makes it possible to use steel cord, in particular HT-Cord and Ultra-HT-Cord, with a quality core wire to manufacture. Through the use of drain coils 2; 2 'with a filling quantity> 50 kg will reduce the Operating effort achieved, and also the noise with a sound level <80 dB is within the permissible limit range.

Claims (22)

1. Process for producing steel cord, in particular HT and ultra-HT cord,

   a) the wires (8; 8') being drawn off, with a constant tension over the entire bobbin filling, from unwind bobbins (2; 2'), which are arranged essentially inside a bobbin frame (la), can be braked mechanically and have a filling quantity > 50 kg and, as a result of a sliding and rolling movement on a conical turn roll (7), the wires being stranded at a single stranding point (9), in double lay, to form the ready-structured stranded wire (15),

   b) the ready-structured stranded wire (15), as it passes through two flyers (13a, 13b) which rotate in synchronism with each other, rotates about itself at twice the speed of the flyers (13a, 13b),

   c) the individual wires (8; 8') are subjected to prior deformation before they run into the stranding point (9),

   d) in the region between the stranding point (9) and the conical turn roll (7), the ready-structured stranded wire (15) is subjected to plastic shaping by means of overtwisting,

   e) the overtwisting speed and the flyer speed are controlled so as to have the same speed ratio to each other over the entire stranding process, including the start-up and braking phases,

   f) before being wound up, the stranded wire (15) is subjected to a defined increase in tensile force and to one or more overtwisting and reshaping operations, in order to dissipate its internal torsional stresses, and is subsequently fed with a constant winding force to a controlled winder (5).
2. Process according to Claim 1, characterized in that

   a) the wires (8; 8'), which are drawn off with a constant tensile force from the unwind bobbins (2; 2'), run onto the largest diameter of the turn roll (7), which is conical and is arranged at the first turning point of the material to be stranded, and, while they are being turned on the turn roll (7), the wires slide towards the smaller diameter and are set turning as a result,

   b) before running into the stranding point (9), the wires (8; 8') are pre-shaped by means of stationary pre-shaping nipples (11a) or pre-shaping rolls (11b), around which the respective wire (8; 8') is led,

   c) between the turn roll (7) and the unwind bobbins (2; 2'), the wires (8) are jointly given the first and second stranding lay at a stranding point (9),

   ca) following this, the ready-structured stranded wire (15) is then subjected to plastic shaping by means of a twisting device (12),

   cb) which, for its part, rotates in the same direction as the flyers (13a; 13b) but, depending on the desired stranding configuration, at 1.8 to 1.95 times the speed of the flyers (13a; 13b),

   d) the ready-structured stranded wire (15) is led on a free flight curve from the first flyer (13a), which is arranged upstream of the bobbin frame (1a), to the second flyer (13b), which is arranged downstream in order to impart the stranded structure,

   e) the internal torsional stresses in the stranded wire (15) are dissipated in a double-pulley haul-off (4), which has a step to a larger diameter, in one or more separately driven overtwisting devices (21), which have a direction of rotation that is opposite to that of the flyers (13a; 13b) of the double-lay stranding machine (1) and, depending on the desired stranding configuration, rotate at 0.3 to 1.0 times the speed, and the stresses are dissipated in one or more re-shaping devices (23),

   f) the stranded wire (15) which is free of torsional stress is fed via a laying device (6) to a dancer-controlled winder (5).
3. Process according to Claim 1 and/or 2, characterized in that the core wire (8') is drawn off as a single wire or a stranded core wire from one or more unwind bobbins (2') that are arranged upstream of the bobbin frame (la), and is led, over the mutually synchronously rotating flyers (13a; 13b), into the region of the unwind bobbins (2) that are arranged in the bobbin frame (1a) and, together with wires (8) that run off from the said unwind bobbins (2) and form the stranded wires, are lead into the stranding point (9) and stranded there with the said wires (8).
4. Process according to Claims 1 to 3, characterized in that, in order to achieve a low wire tensile force, each wire (8; 8') coming from the respective unwind bobbin (2; 2'), before running into the pre-shaping device (11), is lead in several turns over a roll system (10) that has the form of a block and tackle.
5. Process according to Claims 1 to 4, characterized in that, in order to achieve the approximately constant tensile force, the unwind bobbins (2) are braked by a dancer-controlled wire-tension brake (3), whose brake drum (20) has a chromium-plated, ground and polished braking surface with a roughness < 3.2 µm and whose brake shoes (19), actuated by the dancer arrangement (3a; 3b), of a brake band (18) have a friction lining made of polytetrafluoroethylene with a carbon content of 10 to 35%.
6. Process according to Claims 1 to 5, characterized in that, following the plastic shaping, a wire helix is additionally applied to the stranded wire (15), and the winding stresses produced are subsequently dissipated by a re-shaping device (29).
7. Process according to Claims 1 to 6, characterized in that the wires (8; 8') are drawn off from unwind bobbins (2; 2') of a double-lay stranding machine (1) that operates in a 24-hour cycle or a multiple thereof.
8. Process according to Claims 1 to 6, characterized in that the ready-stranded wire (15) is fed to a winder bobbin (38) or a winder-bobbin assembly (39) of a winder (5) that operates in a 24-hour cycle or a multiple thereof.
9. Device for implementing the process for producing steel cord, in particular HT and ultra-HT cord, according to Claim 1, this device having:

   a) a double-lay stranding machine (1) having a plurality of unwind bobbins (2; 2'), which are essentially mounted in a bobbin frame (la) and are braked by a wire-tension brake (3) each, in which machine, in the region of the first turning point of the material to be stranded, a conically shaped turn roll (7) is arranged on the central axis (M) of the double-lay stranding machine (1) and, in the region between the unwind bobbins (2; 2') and the turn roll (7), there are arranged, one after another in the unwind direction of the material to be stranded, a pre-forming device (11), a common stranding point (9) for the first and second stranding lay and a twisting device (12), and a flyer (13a; 13b) having a guide element (14a; 14b) each for the stranded wire (15) that runs off from the smaller diameter of the conical turn roll (7) is rotatably mounted at each end of the bobbin frame (1a), and the mutually synchronously rotating flyers (13a; 13b) and the twisting device (12) have the same speed ratio to each other over the entire stranding process, including the start-up and braking phases,

   b) a double-pulley haul-off (4), which is arranged downstream of the double-lay stranding machine and implements a defined increase in tensile force,

   c) one or more overtwisting devices (21) and re-shaping devices (23), which are arranged one after another in the unwind direction of the stranded wire (15),

   d) a controlled winder (5) having a laying device (6).
10. Device according to Claim 9, characterized in that, between each unwind bobbin (2; 2') and the associated pre-shaping device (11), there is arranged a roll system (10) in the form of a block and tackle, over which the respective unwinding wire (8; 8') is lead in several turns.
11. Device according to Claim 9, characterized in that

    a) each wire-tension brake (3) has a brake band (18), which is coupled to a pivoting lever (3a) of a dancer roll (3b) and comprises any desired number of brake shoes (19) having a brake lining made of polytetrafluoroethylene with 10 to 35% carbon, and a brake disc (20), which is rotatably fixedly connected to the unwind bobbin (2; 2') and whose chromium-plated, ground and polished braking surface (15) has a roughness < 3.2 µm,

    b) depending on the wire (8; 8') to be respectively stranded, the pre-shaping device (11) for treating each wire (8; 8') has either a stationary pre-shaping nipple (11a) or a pre-shaping roll (11b) each, around which the respective wire (8; 8') is led,

    c) the twisting device (12) has a roll system around which the ready-structured stranded wire (15) is led and which has the same direction of rotation but, depending on the desired stranding configuration, rotates at 1.8 to 2.1 times the speed of the flyers (13a; 13b),

    d) arranged downstream of the double-pulley haul-off (4), which is designed to have a step to a larger diameter, there are one or more overtwisting devices (21), which have the opposite direction of rotation but rotate at 0.3 to 1.0 times the speed of the flyers (13a; 13b), as well as one or more re-shaping devices (23),

    e) the winder (5) is designed to have a single winder bobbin (38) or a winding device for accommodating a rotationally driven and laterally movable bobbin assembly (39) having a plurality of winder bobbins arranged axially beside one another.
12. Device according to one and/or more of Claims 9 to 11, characterized in that one or more unwind bobbins (2') for accommodating the core wire (8') in the form of single wires or a stranded core wire are arranged upstream of the bobbin frame (1a).
13. Device according to Claims 9 to 12, characterized in that the winder (5) is assigned a dancer control system, and the dancer (24) is preferably arranged in the region downstream of the last treatment of the stranded wire (15).
14. Device according to Claims 9 to 13, characterized in that the flyers (13a; 13b) are of conical design and the guide elements (14a; 14b) are provided with complete cladding (14c), which has slots (14d) for the stranded wire (15) to be lead through.
15. Device according to Claim 14, characterized in that the guide members (14a; 14b) are designed as guide rolls or guide nipples.
16. Device according to Claims 9 to 15, characterized in that the double-lay stranding machine (1), together with the twisting device (12) and the haul-off (4), is assigned a common main drive, the overtwisting device (21) is assigned its own drive (26), and the winder (5) is assigned its own, dancer-controlled drive (5a), and the main drive and the drive of the over-twisting device (21) are connected to each other via an open-loop and closed-loop control device (28).
17. Device according to Claim 11, characterized in that the pre-shaping radius of the pre-shaping nipple (11a) of the pre-shaping device (11) corresponds to 10 to 15 times the diameter of the wire (8; 8').
18. Device according to Claim 11, characterized in that the radius of the pre-shaping rolls (11b) of the pre-shaping device (11) corresponds to 20 to 30 times the diameter of the wire (8; 8').
19. Device according to Claims 9 to 18, characterized in that a device for applying a helix is arranged between the double-pulley haul-off (4) and the dancer (24).
20. Device according to Claim 19, characterized in that the device for applying the helix is designed as a spiral winder (28), the winding head (30) and the winding-head shaft (32) of the spiral winder (28) being arranged vertically, and the winding-head shaft (32), on the winding-head side, being mounted elastically in a system having a matched depth and, on the drive side, being mounted by means of a radially rigid but rotationally elastic supporting disc (32), and the mounting of the winding-head shaft (32) being axially prestressed by means of cup springs (35).
21. Device according to one or more of Claims 9 to 20, characterized in that the amount of wire (8; 8') that unwinds corresponds to the amount of stranded wire (15) to be wound up, and both the unwind bobbins (2; 2') and the winder bobbins (38) or the bobbin assembly (39) have a holding capacity such that, given optimum speeds, the double-lay stranding machine (1) operates in a 24-hour cycle or a multiple thereof.
22. Device according to one or more of Claims 9 to 21, characterized in that the double-lay stranding machine (1) is mounted, via elastic elements (36), in a box profile (37) that stands freely on the floor of the machine room.

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