EP0725852A1

EP0725852A1 - Process and device for producing steel cord

Info

Publication number: EP0725852A1
Application number: EP95900061A
Authority: EP
Inventors: Helmut Geling; Dimiter Mandadjiev; Martin Poida
Original assignee: Schwermaschinenbau Kombinat Ernst Thalmann VEB; SKET Schwermaschinenbau Magdeburg GmbH
Current assignee: SKET Verseilmaschinenbau GmbH
Priority date: 1993-10-28
Filing date: 1994-10-27
Publication date: 1996-08-14
Anticipated expiration: 2014-10-27
Also published as: EP0725852B1; DE59407571D1; ATE175249T1; DE4337596A1; WO1995012023A1

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

Method and device for producing steel cord

The invention relates to a method and a device for producing steel cord, in particular HT cord or ultra-HT cord (ultra-high tensile strength steel tire cord).

It is known to use double-twist stranding machines for stranding steel wires. From DE 24 62 092 AI a machine is known in which the individual feed coils are arranged one behind the other in each case between gear stands. Each individual wire is guided by roller systems around the coils into the center of the axis of the rotor and from there through a bearing journal to the next coil frame, where it is passed on with the wires to be added in the manner previously described. At the end of the rotor, the wires are deflected in the opposite direction via a deflection roller that rotates synchronously with the rotor. c and in a sinusoidal curve around the coils to the other end of the rotor. Arranged outside the stranding system are an overtightening device for eliminating the large torsional tensions present in the strand due to the double twist stranding, as well as a take-off and rewinder. The first stranding point is in the area of the first deflecting roller, and the second stranding point for realizing the double twist is at the outlet of the stranding machine. With this known machine, however, only hollow strands can be produced in accordance with quality. This machine is not suitable for the production of strands with a core wire, since the core wire retains its length during the stranding and is therefore longer than the wires of the top layer, which is shortened by the second stranding twist and, as a result, causes the strand to be deformed disadvantageously. Furthermore, the winding of the finished steel wire strand requires a high level of operating effort because the operator has to change the winding spool constantly. The spool volume of all payout spools is usually a multiple of the spool volume of the take-up spool. EP 0 563 586 A1 discloses a method and a device for producing high-strength steel wire strands. In this case, a double-twist stranding machine works according to the in-out principle, as a result of which steel wire strands with a core wire are also produced in accordance with the quality. However, it is not possible to use it to produce steel cords of the highest tensile strength, especially HT cord and Ultra HT cord, in accordance with the quality. In addition, the device according to EP 0 563 586 A1 is not suitable for realizing a running time with a 24-hour rhythm, since this rhythm requires a high coil mass and this mass is not possible with the known method and with the known device required accuracy moves and thus the wires to be stranded can not be unwound with the required low tensile stress. Wire cracks are thereby possible which have a negative influence on the quality of the stranded material and the stranding regime.

The invention has for its object to provide a method and an apparatus for producing steel cord, in particular HT cord and ultra-HT cord, it being possible to use the principle of in-out wire strands with a core wire made of HT and Manufacture of ultra-HT wires according to quality, whereby large coil fillings can be processed at a sound level <80 dB.

According to the invention the object is achieved in that

a) the wires are drawn off from a mechanically brakable pay-off 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 roller in a single stranding point in a double stroke to which stranded wire strands are stranded in their structure,

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 strand 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 phases, at the same speed ratio to one another,

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

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 into 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 structure of the stranded wire 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, with the flyer at 1.8 to 95 times the rotational speed,

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 downstream second flyer,

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 Rotate 0, 0 speed and be dismantled in one or more post-forming devices,

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

In the solution according to the invention, since the second twisting with HT and Ultra-HT wire in the area of the flight curve cannot be easily realized, the stranding is concentrated in one area in the area in front of the first deflection roller, with the guidance the bandage or the strands is designed so that the entire bandage rotates around itself, namely at twice the speed of the rotor. The stranding assembly already has twice the rotational speed (stranding speed) of the rotor in the area between the pay-off spool and the deflection roller, so that the stranding assembly has its final twist number (double) immediately after the deflection roller and on the way to the second Deflection pulley is only guided and maintained. This is advantageously carried out via the conically shaped deflection roller. So that the individual wires can better withstand the loads during the stranding, they are subjected to a pre-deformation before entering the stranding point. Furthermore, it is advantageous to overturn the geometrically finished bandage between the stranding point and the conically shaped deflection roller by means of a twisting device. The bandage undergoes plastic deformation. The same is done in the area between the take-off and the rewinder by means of overturning devices.

In this case, the core wire can be drawn off as a single wire or a core strand from one or more spools arranged in front of the spool frame and guided over the flyers rotating synchronously to one another into the area of the spool rollers arranged in the spool frame and with them running out of them Wires forming stranded wires are jointly guided into the stranding point and stranded there.

Preferably, in order to achieve a low wire tensile force, each wire, coming from the respective pay-off spool, is guided in several turns over a roller system in the form of a pulley block before it enters the preforming device.

Expediently, the delivery coils are braked by a dancer-controlled wire pull to achieve the almost constant tensile force, the brake disc of which has a chromed, ground and polished brake surface with a roughness of <3.2 μm and the brake shoes actuated by the dancer arrangement Brake band have a friction lining made of tetrafluoroethylene with 10 to 35% carbon.

It is furthermore possible that, after the plastic deformation, a wire helix is additionally applied to the wire strand, the resulting winding tensions then being reduced by a post-forming device.

The solution according to the invention includes that the wires are drawn off from payout bobbins of a double-twist twisting machine operating in a 24-hour rhythm or a multiple thereof. In a corresponding manner, the stranded wire strand is fed to a take-up reel or a take-up reel package of an on ickler working in a 24-hour rhythm or a multiple thereof.

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

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

c) one or more overturning devices and postforming devices arranged one after the other in the downward direction of the wire strand,

d) a regulated rewinder with a laying device. It is particularly advantageous here that a roller system in the form of a pulley block is arranged between each payout spool and the associated preforming device, over which the respective payoff wire is guided in several turns.

By arranging such a roller system between each payout spool and the preforming device in the form of a bottle train over which each wire is passed, it is possible to use payoff spools with a large spool filling and thus a large mass. With high coil braking forces, low and constant wire tensile forces can be realized over the entire coil filling, which rule out a wire break during the roping process.

An advantageous embodiment of the device is that

a) each wire pull 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 and a brake disc, which is connected to the delivery spool in a rotationally fixed manner, the brake disc of which chrome-plated, ground and polished braking surface has a roughness <3.2 μm,

b) depending on the wire to be stranded, the preforming device for the treatment of each wire 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 stranded wire is guided, which has the same direction of rotation but, depending on the desired stranding structure, 1.8 to 2 times the rotational speed of the flyer, d) the double-disc take-off, which is designed with a jump in diameter toward the larger one, one or more overdriving devices which have the opposite direction of rotation, but which have the 0.3 to 1.0 times rotational speed of the flyer, and one or more post-forming devices are arranged downstream,

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

There is the possibility here that one or more run-off rolls for receiving the core wire in the form of individual 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 being arranged in the area after the last treatment of the wire strand.

Furthermore, it is advantageous, in particular to reduce the noise, that the flyers are conical and the guide elements are provided with a complete covering which has slots for the wire strand to pass through. The guide members can be designed as guide rollers or guide nipples.

A further expedient training consists in that the double twist twisting machine with twisting device and the take-off are assigned a common main drive, the overturning device has its own drive and the rewinder has its own, dancer-controlled drive and the main drive and the drive of the overturning device have one The regulating and control device are connected to one another.

In the aforementioned preform device, the preform nipple preferably has a preform radius which corresponds to 10 to 15 times the wire diameter. The radius of the preform rollers is preferably about. 20 to 30 times the wire diameter.

A further embodiment of the solution according to the invention is that a device for applying a helix is arranged between the double-disc trigger and the dancer.

The device is preferably designed as a spiral winder, the winding head and the winding head shaft of the spiral winder being arranged vertically and the winding head shaft being mounted elastically on the winding head side in a deeply coordinated system and on the drive side by means of a radially stiff, but rotationally elastic support disk and the bearing of the winding head shaft is axially preloaded by means of disc springs.

Appropriately, the amount of the wires running off corresponds to the amount of wire strand to be wound up, and both the unwinding spools and the winding spools or the package of bobbins have such a capacity that the double-stranded twisting machine operates at optimal speeds in a 24-hour cycle or a multiple thereof.

In order to achieve vibration-free work with a low noise level, the double-twist twisting machine can be mounted via elastic elements in a box profile standing freely on the floor of the machine hall.

With the solution according to the invention, it is possible to manufacture a wide range of products including wire strands with core wire made of HT and Ulta-HT wires in a quality manner in cross-country operation and to meet the demands of the user industry for simple operation even of several lines by an operator fulfill, in that there is no need to constantly change the unwinding and winding coils during the entire stranding process and thus economically favorable shift regimes can be realized. The invention is described in more detail in an exemplary embodiment. In the accompanying drawing:

Fig. 1 shows a schematic representation of the front view of the device,

Fig. 2 the side view of a deflection roller arranged after the stranding point,

Fig. 3 shows the front view of the coil frame according to FIG. 1,

Fig. 4 shows a schematic representation of the top view of a roller system arranged downstream of the wire pull brake for a wire drawn off from the payout spool,

5 is a schematic representation of the side view of a double disk take-off for the heddle,

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

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

1, FIG. 8 the front view of a preforming device according to FIG. 1 in the modified embodiment, FIG. 9 the front view of an rFlyer with guide element, FIG. 10 the front view of a spiral winder according to FIG. 6, FIG. 11A to FIG. 11D the front view of FIG Configurations of the device with wire and wire runs.

1 shows a device which has a double-stranding machine 1 and a double-disc take-off 4, one or more overturning devices 21 and postforming devices 23 arranged one after the other in the direction of flow of the wire strand 15 produced, and a controlled rewinder 5 with a laying device 6.

The double-twist stranding machine 1 is provided with a rotating system in which a plurality of pay-off spools 2, each with a wire pull brake 3, are mounted in a common spool frame 1 a are. The coil frame la is via end pivot lb; lc, which can be hollow, rotatably supported about a central axis M, but does not rotate due to its own weight during the stranding process.

One or more further payout spools 2 ^1, each with a wire pull brake 3 ′ and a roller system 10 ′, can be arranged in front of the spool frame 1 a. The core wire 8 'of the wire cord to be produced is drawn off from this payout spool 2'. This core wire 8 ¹ can also be a core strand consisting of several individual wires. The core wire 8 'runs along the central axis M to the pivot lb and via a deflecting roller 1d to a guide element 14a of a flyer 13a arranged in the region of the front end of the coil frame la. From there, the core wire 8 'runs in a free flight curve to a guide element 14b of a flyer 13b arranged in the region of the rear end of the coil frame 1a. The core wire 8 'is guided into the area of the payout spools 2 via a deflection roller le assigned to the pivot lc.

In the area of the central axis M, a conical deflection roller 7 is mounted on or in the front pivot lb 1b, the longitudinal axis of which is essentially perpendicular to the central axis M. This deflection roller 7 forms a first deflection point for that of the payout spools 2; 2 'and stripped material consisting of the wires 8 and the core wire 8', since - as shown in FIG. 2 - runs onto the largest portion of their diameter and slides under their own rotation during the deflection on their jacket towards the narrower end part. As a result, the stranded material undergoes complete stranding and forms a stranded wire 15, the first and second stranding twists being combined in one stranding point (FIG. 3).

As shown in FIG. 1, each wire 8 drawn from the respective pay-off spool 2 is in each case via a radially inner roller system 10 in the form of a pulley block with an inner actuating roller 3b of a wire pull brake 3 (FIG. 3) guided. A more detailed description is given below with reference to FIGS. 3 and 4. All wires 8 running off the payout spools 2 run at a slight lateral distance from the central axis M to the stranding point 9 and then along a wire strand 15 the central axis M preferably through the hollow pivot lb to the wider end part of the conical deflection roller 7.

The section between the payout spools 2 and the deflection roller 7 has, as shown in FIG. 3, a preforming device 11, the common stranding point 9 for the first and second stranding twist and a twisting device 12 in the direction of the descent of the stranded goods.

The preforming of the individual wires 8 is necessary so that they can better withstand the loads of the stranding process. The so-called "rigidity" is removed from the wires 8.

7 and 8 different embodiments of the preforming device 11 for the wire 8 are shown. These are used depending on the wire quality to be processed and the wire diameter to be processed.

FIG. 7 shows a preform device 11 with a fixed preform nipple 11a. Each preform nipple 11a has a preform radius which corresponds to 10 to 15 times the diameter of the wire 8 to be processed.

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

After passing through the roller system 10, the wire 8 is guided through the preforming device 11 and then runs into the stranding point 9, where it receives the first and second stranding twist with the other wires 8 and the core wire 8 ¹ . The geometrically finished stranding end, which ends from the stranding point 9, is rotated by means of the twisting device 12 (FIG. 3), so that it maintains its structure during the continuation to the rewinder 5. There is a plastic deformation. The twisting device 12 rotates in the same direction and, depending on the desired stranding structure, at the 1.8 to 1.95 times the rotational speed of the flyers 13a; 13b of the double twist stranding machine 1.

As already explained, a flyer 13a is at each end of the coil frame la; 13b on the pivot lb; lc, each of which has a conical holder with a deflection or guide element 14a; 14b in the form of a roller or a nipple.

9 shows the upper part of the front cone-shaped flyer 13a. The guide element 14a for the wire strand 15 is completely enclosed by a covering 14c. In this, slots 14d are arranged in the passage of the wire strand 15. The flyer 13b is designed accordingly. This particular embodiment of the flyer 13a; 13b leads to advantageous noise minimization and improvement of the performance parameters of the double-twist stranding machine 1.

The wire strand 15 drawn off from the narrower end part of the deflection roller 7 and now finished in its structure runs to the guide element 14a of the first flyer 13a and from there in a free flight arc over the guide element 14b of the second flyer 13b to one in the pivot lc transversely to the central axis M. stored deflection roller 15. The two ^' flyers 13a; 13b are jointly driven by a drive (not shown) via gearboxes known per se, for example toothed belt gearboxes. gate synchronously driven, the conical deflection roller 7 mounted in or on the pivot 16 rotating together with the flyer 13a about the central axis M. 3 shows a coil frame 1 a with the take-off rollers 2 and the associated wire pull brake 3 and the roller system 10.

The wire pull brake 3 is designed as a so-called dancer-controlled brake and has a two-armed pivot lever 3a, on one arm of which the actuating roller 3b wrapped by the running wire 8 is mounted and on the other end a spring element 3c engages. The arm carrying the actuating roller 3b is connected via a linkage 17 to a brake band 18 consisting of brake shoes 19, the brake lining of which presses against the braking surface of a brake disk 20 fastened to the shaft of the supply spool 2. The braking surface of the brake disc 20 is preferably chrome-plated, ground and polished and has a roughness of less than 3.2 μm. The brake or friction lining of the brake shoes 19 expediently consists of tetrafluoroethylene with a carbon content of approximately 10 to 35%.

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

The wire 8 is fed to the roller system 10 via this. As shown in FIG. 4, it runs through this in several windings.

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

There are spools 2; 2 'can be used with a filling quantity> 50 kg. This means that steel cords can be manufactured in cross-country operation in line with quality. The structure of the wire strand 15 which is already structured when it enters the first flyer 13a remains in the area of the free flight curve between the two flyers 13a; 13b is received and is inserted into the double-disc take-off 4 via the deflection roller 16 rotating around the central axis M when leaving the stranding machine 1.

5, the double-disc trigger 4 is shown in more detail. It has two axially parallel rollers 4a; 4b. The roller 4a can be provided with circumferential grooves 4c, while the roller 4b has a step 4d. The wire strand 15 runs in several ordered loops around the two rollers 4a; 4b, with stage 4d causing a jump from a smaller to a larger roll diameter. This results in a defined increase in tensile force, by means of which torsional stresses in the wire strand 15 are reduced.

In order to further completely reduce internal tensions and to maintain the stranding of the stranded wire 15, the double-disk take-off 4, as shown in FIG. 1, is followed by a further, separately driven overturning device 21. This overturning device 21 has a to the flyers 13a; 13b of the double twist stranding machine 1 in the opposite direction of rotation and, depending on the desired stranding structure, rotates at 0.3 to 1.0 times the rotational speed of the flyers 13a; 13b. The overturning device 21 is driven separately from the double twist stranding machine 1 by a drive 26. This drive 26 is regulated as a function of the main drive for the double-twist stranding machine 1 and the double-disc take-off 4, which is not shown in detail, by means of a regulating and control device 27. The direction of rotation and the speed of rotation of the overturning device 21 are also regulated via this.

Following the overturning device 21, the stranded wire 15 is fed via deflection rollers 22 to one or more postforming devices 23 which have at least one row of straightening rollers arranged one behind the other with mutual offset, the mutual offset can be adjusted according to the respective product and operating conditions. The wire strand 15 runs in a wave-shaped path over the straightening rollers, and the resulting bending and flexing effects result in a reduction in tension and position corrections of the wires 8 of the wire strand 15.

The wire strand 15 is then guided via deflection rollers 22 and the roller 4a of the double-disc take-off 4 to a weight-loaded dancer arm 24 with a deflection roller 25 and further via a laying device 6 to a rewinder 5 which is driven separately by a drive 5a. The dancer arm 24 is electrically connected to the winder 5 and uses a contactless measuring element (not shown in more detail) to regulate the winder speed and thus the winding force.

The rewinder 5 either has a single take-up reel 38 or a laterally movable reel package 39, the take-up reels 38 of which are arranged axially next to one another.

The wire strand 15, coming from the double-twist stranding machine 1, is guided in the direction of the arrow along the guide sections a to m.

6 shows a further embodiment of the device in the area between the double-disc take-off 4 and the winder 5. In this embodiment, the stranded wire 15, coming from the double-twist stranding machine 1, runs along the guide section a in the manner described above via the double-disk take-off 4 along the guide sections b; c. The wire strand 15 then runs along the guide section d via a deflection roller 22 through the overturning device 21 and then via further deflection rollers 22 through the guide portions e; f arranged post-forming devices 23. Via further guide sections g; h and deflection rollers 22, the wire strand 15 now runs into a guide section i in one vertically arranged spiral winder 28 with which a coil is applied. The spiral tensions generated are reduced in a downstream post-forming device 29 located in a guide section k. The wire strand 15 then runs through the roller 4a of the double-disc take-off 4, the deflection roller 25 on the dancer arm 24 and further deflection rollers 22 and the laying device 6 through the guide sections 1 to p until the finished product in the winder 5 on a take-up reel 38 or a Coil package 39 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. The winding head shaft 32 is elastically mounted on the winding head side in a deeply coordinated system in bearings 33 and on the drive side by means of a radially rigid, but rotationally elastic support disk 34 (angular offset possible). The mounting of the winding head shaft 32 is axially preloaded by means of disc springs 35.

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

A further embodiment of the device is that the double-twist stranding machine 1 is mounted via elastic elements 36 in a box section 37 standing freely on the machine shop floor. This means that vibration-free working and a noise level of less than 80 dB are achieved even with pay-off spools 2 with a filling weight> 50 kg.

As described in the exemplary embodiment with reference to FIG. 1, the core wire 8 ′ is elongated by one or more outside the coil frame. Oil spools 2 'removed. However, it is also possible for the core wire 8 to be drawn off in a manner known per se from a payout spool 2 arranged in the frame 1a.

Configurations of the device with wire and wire runs are shown in FIGS. 11a to 11d. However, the scope of the invention is not limited to these examples.

In FIG. 11a, according to the program 2 + 2, two payout spools 2 'for the core wire 8' are provided in front of the payout spools 2 arranged in the rotating system of the double-twist twisting machine 1 (FIG. 1). The core wires 8 ′ run into the rotating system and are stranded with the wires 8 running out in the spool frame 1 a (FIG. 1). After the wire strand 15 is subjected to a defined increase in tensile force and one or more overturning and post-forming processes, as described, in order to reduce its internal torsional stresses, the finished steel cord is fed to the controlled rewinder 5 with a constant winding force.

In Fig. 11b, according to the program 2 + 3, the two spools 2 'in the rotating system are assigned three spools 2 for the wires 8. The procedure ^is' described vorste- basis.

In FIG. 11c, according to the program 3 + 6, a payoff spool 2 'is arranged in front of the rotating system. A core strand, which consists of three individual wires stranded together, runs from this payout reel, which, as explained at the beginning of the exemplary embodiment, is also referred to as core wire 8 '.

In the rotating system, there are six payout spools 2, each with a wire 8, two of which are parallel to one another. The stranding takes place as described above.

Several variants of the program 3 + 9 + 1 are shown in FIG.

In the first variant, ten pay-off spools 2 are arranged in the rotating system, two in each case parallel to one another. - to ¬

lie to each other. Of these, a payout spool 2 is wound with the core strand, consisting of three individual wires. The remaining nine feed coils are each wound with a single wire. As described with reference to FIG. 6, a spiral consisting of a wire is then applied to the stranded wire 15 on the wire strand 15 on the resulting rope formation. The finished steel cord is then applied to the regulated rewinder 5.

In a second variant, which is shown in broken lines in FIG. 11D, as in FIG. 11c, a payout spool 2 'is arranged in front of the rotating system, and the core strand runs from it.

Other variants, not shown, are also possible.

This machine configuration is also suitable for stranding programs in which individual places for winding spools 2 are not occupied.

A program 3 + 6 is mentioned as an example. In such a program, the core strand, consisting of three single wires stranded together, runs from the payout spool 2 'arranged outside the rotating system. Within the rotating system, six payoff spools 2 are wound with a single wire each in the coil frame 1a (FIG. 1). Four of the delivery spools 2 remain free. The procedure is then as described above.

The solution described makes it possible to produce steel cord, in particular HT cord and ultra HT cord, with a core wire in accordance with the quality. Through the use of drain coils 2; 2 'with a filling quantity> 50 kg, the operating effort is reduced, and the noise generation with a sound level <80 dB is also within the permissible limit range.

Claims

claims

1. Process for the production of steel cord, in particular HT and Ultra-HT cord, wherein

a) the wires (8; 8 ¹ ) are drawn off from a mechanically brakable outlet spool (2; 2 ¹ ) with a filling quantity> 50 kg arranged essentially within a spool frame ( ^{1 a} ) over the entire spool filling with constant tension and as a result of sliding rolling and rolling movement on a conical deflection roller (7) in a single rope point (9) are twisted in a double lay to form the wire strand (15) finished in its structure,

b) the wire strand (15) finished in its structure rotates around itself when two flyers (13a, 13b) rotating synchronously with one another pass through the flyer (13a, 13b) at twice the speed,

c) the individual wires (8; 8 ¹ ) are subjected to a pre-deformation before entering the stranding point (9),

d) the structure of the wire strand (15) in the area between the stranding point (9) and the conical deflecting roller (7) 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 (15) 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 regulated rewinder (5) with constant winding force.

2. The method according to claim 1, characterized in that

a) the wires (8; 8 ') drawn off from the pay-off spools (2; 2') with constant tensile force run onto the largest diameter of the conical deflection roller (7) arranged in the first deflection point of the rope material and during it Slide the deflection on the deflection roller (7) towards the smaller diameter and thereby set it into rotation,

b) the wires (8; 8 ') are preformed before entering the stranding point (9) by means of fixed preform nipples (11a) or preform rollers (11b) around which the respective wire (8; 8') is guided ,

c) the wires (8) between the deflection roller (7) and the payout spools (2; 2 ') receive the first and second stranding twist together in one stranding point (9),

ca) the wire strand (15) which is finished in its structure is then subjected to a plastic deformation by means of a twisting device (12),

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

d) the structure of the stranded wire (15) for maintaining the stranding structure is guided in a free flight curve from the first flyer ( ^"' ) upstream of the coil frame (la) to the downstream second flyer (13b),

e) the internal torsional stresses of the wire strand (15) in a double-disc take-off (4), which has a jump in diameter towards the larger one, in one or more reren separately driven overturning devices (21), which have a direction of rotation opposite to the flyers (13a; 13b) of the double twist twisting machine (1) and, depending on the desired twisting structure, rotate at 0.3 to 1.0 times the speed and in one or more post-forming devices (23) are dismantled,

f) the torsion stress-free wire strand (15) is fed to a dancer-controlled winder (5) via a laying device (6).

3. The method according to claim 1 and / or 2, characterized gekennzeich¬ net that the core wire (8 ') as a single wire or a core strand of one or more in front of the spool frame (la) arranged spools (2 ¹ ) withdrawn and the syn ¬ Chronically rotating flyers (13a; 13b) are guided into the area of the reel rollers (2) arranged in the spool frame (la) and together with the wires (8) running from them and forming the stranded wires into the stranding point (9) guided and stranded there with these.

4. The method according to claim 1 to 3, characterized in that to achieve a low wire tensile force each wire (8; 8 '), coming from the respective pay-off spool (2; 2'), before entering the preforming device (11) in several win ¬ dung on a roller system (10) in the form of a bottle train.

5. The method according to claim 1 to 4, characterized in that the supply coils (2) to achieve the approximately constant traction are each braked by a dancer-controlled wire pull brake (3) whose brake disc (20) is a chrome-plated, ground and polished Has braking surface with a roughness <3.2 microns and the brake shoes (19) of a brake band (18) actuated by the dancer arrangement (3a; 3b) have a friction lining made of tetrafluoroethylene with a carbon content of 10 to 35%.

6. The method according to claim 1 to 5, characterized in that a wire coil is additionally applied to the wire strand (15) after the plastic deformation and the resulting winding tensions are subsequently reduced by a post-forming device (29).

7. The method according to claim 1 to 6, characterized in that the wires (8; 8 ') of winding spools (2; 2') one in

24-hour rhythm or a double twist twisting machine (1) working from it.

8. The method according to claim 1 to 6, characterized in that the stranded wire strand (15) of a take-up spool (38) or a take-up spool package (39) one in

24-hour rhythm or a multiple winder (5) working from it.

9. Device for carrying out the method for producing steel cord, in particular HT and ultra-HT cord, according to claim 1, which comprises:

a) a double-twist stranding machine (1) with a plurality of outlet spools (2; 2 '), which are essentially mounted in a spool frame (la) and braked by a wire pull brake (3), in which in the area of the first deflection point of the stranded material in A conically shaped deflection roller (7) is arranged on the central axis (M) of the double-twist stranding machine (1) and a preforming device is arranged one after the other in the area between the pay-off spools (2; 2 ') and the deflection roller (7) in the downward direction of the rope. 11), a common stranding point (9) for the first and second stranding twist and a twisting device (12) are arranged as well as a flyer (13a; 13b) with a guide element (14a; 14b) for the wire strand (15) running from the smaller diameter of the conical deflection roller (7) is rotatably mounted and synchronously the flyer (13a; 13b) rotating with respect to one another and the twisting device (12) have the same speed ratio to one another over the entire stranding process including the running-down and braking phase,

b) a double-disc take-off (4), which is arranged downstream of the double-twist stranding machine (1) and realizes a defined increase in tensile force

c) one or more overturning devices (21) and post-forming devices (23) arranged one after the other in the downward direction of the wire strand (15),

d) a controlled Aufickler (5) with a laying device (6).

10. The device according to claim 9, characterized in that between each delivery spool (2; 2 ') and the associated preforming device (11) a roller system (10) is arranged in the form of a pulley block, via which the respective ablau¬ fende wire (8; 8 ') is performed in several turns.

11. The device according to claim 9, characterized in that

a) each wire brake (3) has a brake band (18) coupled to a swivel lever (3a) of a dancer roll (3b), consisting of any number of brake shoes (19) with a friction lining made of tetrafluoroethylene with 10 to 35% carbon and one with the delivery spool (2; 2 ') has a rotatably connected brake disc (20), the chromed, ground and polished brake surface (15) of which has a roughness of <3.2 μm,

b) the preforming device (11) for the treatment of each wire (8; 8 ') depending on the wire to be stranded (8; 8') either one fixed has the preform nipple (11a) or a preform roller (11b) around which the respective wire (8; 8 ') is guided,

c) the twisting device (12) has a roller system around which the stranded wire is constructed

(15), which has the same direction of rotation, but depending on the desired stranding structure 1.8 to 2.1 times the speed of rotation of the flyers (13a; 13b),

d) the double-disc take-off (4), which is designed with a jump in diameter towards the larger, one or more overturning devices (21) which control the opposite direction of rotation, but which are 0.3 to 1.0 times the speed of rotation Have flyers (13a, - 13b) and one or more post-forming devices (23) are arranged downstream,

e) the rewinder (5) with a single reel

(38) or a winding device for receiving a rotationally driven and laterally displaceable package (39) with a plurality of winding coils arranged axially next to one another.

12. The device according to one and / or more of claims 9 to 11, characterized in that one or more Ab¬ iaaufroll (2 ') for receiving the core wire (8') in the form of individual wires or a core strand in front of the coil frame

(la) are arranged.

13. Device according to Claim. 9 to 12, characterized in that the rewinder (5) is assigned e_ -ιe dancer control and the dancer (24) is preferably arranged in the area after the last treatment of the wire strand (15).

14. The apparatus according to claim 9 to 13, characterized in that the flyers (13a, - 13b) are conical and the guide elements (14a; 14b) are provided with a complete covering (14c) which is used to carry out the wire strand (15th ) Have slots (14d).

15. The apparatus according to claim 14, characterized in that the guide members (14a; 14b) are designed as guide rollers or guide nipples.

16. The apparatus according to claim 9 to 15, characterized in that the double-twist twisting machine (1) with a twisting device (12) and the trigger (4) a common main drive, the overturning device (21) has its own drive (26) and Rewinder (5) its own, dancer-controlled

Drive (5a) are assigned and the main drive and the drive of the overturning device (21) are connected to one another via a regulating and control device (28).

17. The apparatus according to claim 11, characterized in that the preform radius of the preform nipple (11a) of the Vorformvor¬ direction (11) corresponds to 10 to 15 times the diameter of the wire (8; 8 ¹ ).

18. The apparatus according to claim 11, characterized in that the radius of the preforming rollers (11b) of the preforming device (11) corresponds to 20 to 30 times the diameter of the wire (8; 8 ').

19. The apparatus according to claim 9 to 18, characterized in that between the double disc trigger (4) and the dancer (24) a device for applying a helix is angeord¬ net.

20. The apparatus according to claim 19, characterized in that the device for applying the coil is designed as a spiral winder (28), wherein the winding head (30) and the winding head shaft (32) of the spiral winder (28) is arranged vertically, and the winding head shaft (32) on the winding head side in a deeply coordinated system is mounted elastically and on the drive side by means of a radially rigid but rotor-elastic support disk (34) and the bearing of the winding head shaft (32) is biased axially by means of disc springs (35).

21. The device according to one or more of claims 9 to

20, characterized in that the amount of the running wires (8; 8 ') of the amount of wire strand to be wound up

(15) and both unwinding spools (2; 2 ') as well as the reel spools (38) or the spool package (39) have such a capacity that the double lay rope machine (1) at optimal speeds in 24 hours Rhythm or a multiple of it works.

22. The device according to one or more of claims 9 to

21, characterized in that the Doppelschlagverseilma¬ machine (1) via elastic elements (36) in a freely standing on the machine shop floor box section (37) is stored.