LU83155A1 - METHOD AND APPARATUS FOR WINDING A METAL WIRE ON CORES AND SPOOLS OF WIRE THUS OBTAINED - Google Patents

Description

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The present invention relates to a method for winding a metal wire on a core and it also relates to an apparatus for carrying out this method, as well as the coils of wire thus obtained.

It is known to wind a metal wire on a core so as to bring it to a higher density than in a coil of loose wire, but this wire must be wound either on a core comprising end plates which are removed after having tied the wound wire by means of fasteners extending between this wire and this core, the ends of these fasteners; being fixed to the outside of the wire, either on a core comprising permanent end plates between which the wire is wound in a translational movement, or on a core comprising a permanent end plate on which it stands vertically and on which also the wire is wound from the base, to then be unwound from the top. In either case, the compactness of the turns of the wire against the plate or plates is such that following any subsequent heat treatment of the wound wire (i.e. before unwinding ), for example, to carry out an annealing treatment, a considerable number of turns of wire are welded together, so that it becomes impossible or difficult to unwind or, at best, this results in wire waste, as well waste of time and labor to remove the damaged wire and restore continuous wire supply.

The main object of the invention is to provide a method for winding a metal wire on a core while avoiding the aforementioned drawbacks.

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A secondary object of the invention is to provide an apparatus for implementing this method.

Yet another object of the invention is to provide spools of thread obtained by the method of the invention, while facilitating the use of the apparatus of the latter.

According to one aspect of the present invention, a method for winding a metal wire on a core consists in anchoring one end of the wire on the core, rotating the latter, animating the wire in a translational movement; tion along the rotating core at such a speed that the adjacent turns formed during any translation are spaced from each other, adjust the tension of the wire to be wound and gradually modify the translation so that the mass of wire formed on the spool occupies three zones comprising a central zone with constant cross section, as well as two end zones each having a cross section decreasing progressively to zero from the cross section of the central zone.

Consequently, the turns of wire formed during one or the other translation are practically not parallel to the turns of wire of the adjacent translations and the pressure exerted between the wires which cross in adjacent translations, cannot reach a value such that after a possible subsequent heat treatment of the wound wire, a large number of turns are welded together even near the core.

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The core can consist of a cylindrical tube • provided with a plate (or plate) at one end only, the progressive modification of the translation being carried out by gradually reducing the length of the translation from the two ends of the core of such so that the central zone comprises a cylindrical external envelope and that the end zones each comprise a frustoconical external envelope, the speed of reduction of the length of the translation being preferably equal from the two ends so that, in combined with the tension of the wire, the firmness of the hooking at the ends of the wound wire (that is to say the frusto-conical areas) is sufficient to avoid the fall of the end turns of the wire when the core is brought to the vertical and that one or the other of its ends occupies the lower position, however, if a plate (or a plate) is provided at only one end of the core, the coil formed s e will usually stand on this platter.

As a variant, the core may consist of a tube comprising a cylindrical part, one end of which is integral with the smallest end of a frustoconical part, the length of the translation being slightly less than the length of the cylindrical part of the core, while the progressive modification of the translation is carried out by gradually moving it from the cylindrical part towards the larger end of the frustoconical part, so that an end zone comprises a frustoconical outer shell and a cylindrical inner shell contiguous to the cylindrical inner envelope of the central zone; by - 5 - contiguous to the cylindrical outer envelope of the central zone.

The coil formed is easily adapted to stand on the largest end of the frustoconical part of the core or so that this end comes to be placed above the other end of the core of another similar coil.

Preferably, during winding, the core is rotated on a horizontal axis although, during the subsequent unwinding of the wire, the core can be mounted ver-; tically by placing, in the upper position, a frustoconical end zone or the external frustoconical end zone, thus making it easier to withdraw the wire upwards from the entire periphery of the spool.

Preferably, the rotation of the core is adjusted so that the wire is wound at a constant linear speed, thus facilitating the maintenance of a constant tension; however, the rotation and the tension are preferably adjustable independently of each other in order to be able to adapt them to a wide range of thread sizes, however, in the process of the present invention, it is envisaged to wind a thread with a maximum diameter of approximately 1 mm.

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Preferably, the translation speed can be adjusted so that the pitch of the turns of any translation can be adjusted according to the size of the wire. The process of the invention is considered to be suitable for wires of any size up to a diameter of 1 mm. The minimum step that is considered appropriate, *. - 6 - 76 mm. In a specific example, a pitch of 32 mm has been adopted for a wire with a diameter of 0.46 mm wound on a smooth cylindrical core with a length of 550 mm and a diameter of 127 mm which, with a reduction of 0.025 mm in translation length by translation and a tension of 3 to 4 kg at a speed of 447 m / minute, gave 80-90 kg of wound wire with a firm anchor point of half a angle 30 °. For a wire with a diameter of 0.37 mm, the reduction in the translation length would be 0.025 mm for 1.5 translation while, for a wire with a diameter of 0.62 mm, the reduction in length of translation would be 0.038 mm per translation, "

According to another aspect of the present invention, an apparatus intended for winding a wire on a core comprises a frame on which is mounted a rotary shaft provided with an adapter intended to come to engage with drive on a core, an element of drive driven by a motor to rotate the shaft, a guide element intended to convey the wire near the wire wound on the core, as well as to animate it with a translational movement along the latter, an element retainer intended to tension the wire to be wound on the core, as well as an adjustment element intended to gradually modify the translation of the guide element.

Preferably, the shaft can be rotated by the drive element when the core occupies a horizontal position, but preferably this shaft has a support element which can be disengaged for one end of the core, while a horizontal pivoting support element - - 7 - loading and unloading. Preferably, the pivoting support element comprises a lever arm and a double-acting piston / cylinder unit in order to facilitate the pivoting of the core between its horizontal position and its upright position. However, the core can rotate in a vertical position and, in this case, it is not necessary to provide additional elements to bring it into this position for loading and unloading.

Preferably, the guide element is mounted on a carriage which can move along a slide parallel to the shaft when it is rotated by the motor drive element, while the adjustment intended to gradually modify the translation of the guide element preferably consists of two limit switches mounted near the respective ends of the carriage and which can come into contact with respective stops mounted on a screw shaft (which can have left-hand and right-hand screws with a stop on each screw) extending parallel to the slide of the carriage, this screw shaft being able to be driven in rotation slowly and / or intermittently according to the wire feed speed or the speed of rotation of the core shaft or the speed of translation, in order to gradually modify the translation at the two ends of the core. The transmission provided for the translation element can be multiplied with respect to the motor drive element or it can be independent.

The retaining element for tensioning the wire to be wound can be of any known type, for example-) '* * - 8 - retaining is easily adjustable, for example, by adjusting the degree of interference of the broom and / or adjusting the space between adjacent rollers, as appropriate. Several rolls arranged in staggered rows are particularly advantageous because they can also be used to straighten the wire.

According to yet another aspect of the present invention, a coil of wire comprises a cylindrical tubular core having a plate or a plate at one end only, this core receiving the wire which is wound therein according to the method of the invention.

Preferably, the end of the core which is remote from the plate, has a notch in which engages a projection formed on the adapter provided on the shaft driven by a motor and forming part of the apparatus of the present invention .

According to another aspect of the present invention, a coil of wire comprises a core having a cylindrical tubular part, one end of which is integral with the smaller end of a frustoconical part, the wire being wound on the two parts of this core. according to the method of the invention. Preferably, the end of the cylindrical tubular part which is distant from the frustoconical part ^ has a notch into which a projection provided on 1 comes, the adapter of the shaft driven by a motor and forming part of the apparatus of the invention.

The coiled wire can be subjected to a bright annealing; this operation taking place on the core after winding, without, however, the turns of the wire being strongly welded compared to loose windings, the coils according to the invention can support a weight of wire up to five times more high, thereby increasing the effective capacity of the annealing chambers by a value of up to $ 75 * thus reducing wire losses to a value as low as 1% ·

The different aspects of the invention will be described below with reference to the accompanying drawings in which: Figure 1 is a front view of a wire winding machine forming part of the apparatus of the invention. and the protective element of which is raised, this view also showing a core to be loaded in FIG. 2 is a front and right view of the wire winding machine, this view showing the core at the start of the winding, the protective element being however always raised $ FIG. 3 is a partial view showing, on a larger scale, a part of the machine illustrated in FIG. 2} FIG. 4 is a schematic side elevation of the apparatus, this view showing the guide element conveying the wire to the core, as well as the retaining element intended to tension the wire to be wound; FIG. 5 is a partial view illustrating the translation element provided, for the guide element, as well as the adjustment element intended to modify the translation length of the guide element; FIG. 6 is an elevation in partial section of a coil on the core of which a wire has been wound - Fig. 7 is an elevation in partial section of another coil comprising a wire wound on a different core, but in the same apparatus in which slight modifications have been made to the wire winding machine.

In FIGS. 1 to j, a wire winding machine comprises a frame 1 on which is mounted a rotary shaft 2 comprising an adapter 3 intended to engage in drive on a core 4 * a motor 5 and a box gears 6 installed in the aforementioned frame in order to rotate the shaft (by suitable transmission elements which are not shown), a guide element 7 routing the wire 8 near the wire wound on the core (but initially near the core itself) and to animate the wire in a translational movement along the core, as well as an adjusting element 9 intended to progressively reduce the length of the translation of the guide element ^ from the two ends of the nucleus. This device is completed by retaining elements 10, 11 (shown only in FIG. 4) in order to tension the wire 8 to be wound on the core 4.

The shaft 2 can be rotated by the * ej—— * drive 5f 6 when the core 4 occupies a horizontal position (see Figure 2), the adapter 3 having a projection 12 from engaging a notch 13 formed in one end 14 of the core (see also Figure 6), the latter being a cylindrical tube provided with a plate lC at its other end 16. The core 4 is loaded and unloaded! j in the upright position (see FIG. 1), a bearing 17 provided for the end 16 provided with a plate comprising a lug (n ^ n - 11 - horizontal 18 on which this bearing pivots. A lever arm 19, as well as a double-acting piston / cylinder unit 20 facilitates the pivoting of the core between its horizontal position and its upright position A flywheel 21 (shown only in FIG. 2) provided with a worm screw (not shown) acts, at the intervention of the bearing 17, to engage the notched end 14 of the core 4 in the adapter 3 provided on the shaft 2. A grapple 22 adapted to a chain lifting block 23 engages in holes 24 ( see also Figure 6) made in the notched end 14 of the core 4 to raise and lower the latter but, more particularly, to raise and lower the coil 4W on which the wire is wound (see only Figure 6).

Before lowering a protective element 25 of the machine to engage a pawl 26 on a safety circuit breaker 27 so that the drive element 5, 6 can start, the end of the wire 8 is passed through the guide element 7 · The latter consists of an arm 28 projecting upwards from a carriage 29 (FIG. 5) passing through protective brushes 30, this arm supporting two guide pins 31 and a pivoting finger 32 comprising an annular guide 33 at its free end (see FIG. 3) · 0 ”manually turns the core 4 to wind a few turns of the wire 8 around the core and anchor the end of this wire, as shown in the figure 2.

When the wire 8 has been anchored on the core 4 and the protective element 25 has been lowered into the operating position in which the pawl 26 engages on the safety circuit breaker 27, the drive element 5, 6 can start, - 12 - annular 33 is brought closer to the core # The carriage 29 supporting the guide element 7 is driven in a translational movement by a control 34 with pinions and belt (FIG. 5) whose reversal is effected by two limit switches 35A, 35B mounted near the respective ends of the carriage and which can come into contact with respective stops 3ÖA, 30B mounted respectively on worms with right and left pitch 37A, 37B formed on a shaft 38 extending parallel to a slide 39 provided for the carriage, this twin-screw shaft being able to be driven in rotation intermittently as a function of the translation speed, thus progressively reducing the translation length from the two ends kernel itites #

The retaining elements 10, 11 (FIG. 4) intended to tension the wire 8 consist, on the one hand, of a winch 40 provided with a wire guide 41 and a brush 42 and, on the other hand , of several staggered rollers 43A, 43B, the tension being easily adjustable, for example, by adjusting the degree of interference of the brush 42 with the wire guide 4 * and / or by adjusting the space provided between the adjacent rollers 43A, 43B. The part of the apparatus ensuring the feeding of the wire also comprises a pulley 44 freely rotating and driven by the wire 8 passing over it, a tachometer 45 driven by this pulley 44 and regulating the speed of rotation of the shaft 2 and from the core 4j a winch 46 driven to adapt its peripheral speed to that of the wire 8, as well as a tension compensator 47 absorbing the slight fluctuations possibly occurring in the speed and / or the tension of the wire.

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The gradual reduction of the translation of 11 guide element 7 from the two ends of the core 4 has the effect of forming a coil of wire 4W (FIG. 6) comprising a central zone C having a cylindrical outer envelope and two end zones E each comprising a frustoconical outer envelope.

When the central zone C reaches a diameter at which the coiled wire comes into contact with a "trigger" bar 48 (FIG. 1), the drive elements 5, 6 are automatically stopped and the coil of wire 4W can be withdrawn from the machine by raising the protective element 25, by turning the handwheel 21 towards the rear * to disengage the notch 13 of the core 4 out of the projection 12 formed on the adapter 3 of the shaft 2, by actuating the piston / cylinder unit 20 for pivoting the spool in the upright position in which it is ready to be lifted by the grab 22 adapted to the chain lifting block 23, The trigger bar 48 also seems to stop the machine in the event of a wire break 8, the free end being on the core being driven out by centrifugal force to thus come into contact with the "trip" bar, * thus causing a short circuit stopping the supply supplied to the motor 5 ·

According to the variant illustrated in FIG. 7, the core 4 ′ consists of a tube comprising a cylindrical part 49, one end of which is integral with the smallest end of a frustoconical part 50. The coil of wire 4W ′ illustrated and formed on the core 4 * can be obtained using the apparatus illustrated in FIGS. 1 to 5 in - 14 - the frusto-conical part 50 of the core 4 'while, on the other hand, the shaft 38 must be replaced by a shaft comprising two screws without end of the same step, the stops 36A, 36B being spaced apart by a distance slightly less than the length of the cylindrical part 49 of the core 41j while the translation of the guide element 7 is gradually displaced (by an equal movement and simultaneous stops 3êA, 36B in the same direction along the screw shaft) from the cylindrical part only towards the largest end of the frustoconical part, so that the wire coil 4W 'has a central area C having an outer cylin envelope drique, an end zone E comprising a frustoconical external envelope and an end zone E ’comprising a cylindrical external envelope. The core 41 has a notch 13 and two holes 24 made in the end of the cylindrical part 49 which is distant from the frustoconical part 50 and this, for the purpose which has been described previously with reference to the core 4 illustrated in the figures 1, 2 and 6.

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Claims (21)

1, Method for winding a metal wire on a core, characterized in that it consists in anchoring one end of the wire on the core, rotating the latter, animating the wire in a translational movement along the core rotating at a speed such that the adjacent turns formed during any translation are spaced from each other, adjust the tension of the wire to be wound and gradually modify the translation so that the mass of wire formed on the coil occupies three zones, namely a central zone having a constant cross section and two end zones each having a cross section decreasing progressively to zero from the cross section of the central zone, 2, A method according to claim 1, characterized in that the core consists of a cylindrical tube, while the progressive modification of the translation is ensured by progressively reducing the length of translation from the two ends of the core so that the central zone comprises a cylindrical external envelope and that the end zones each comprise a frustoconical external envelope. 3, Method according to claim 2, characterized in that the speed of reduction of the length of the translation is equal from the two ends, 4, Method according to claim 1, characterized in that the core consists of a tube having a cylindrical part, one end of which is integral with the smallest end of a frustoconical part, the length of the - ιό -} gressive de the translation is ensured by gradually moving it from the cylindrical part towards the largest end of the frustoconical part so that an end zone has a frustoconical outer envelope and a cylindrical inner envelope contiguous to the cylindrical inner envelope of the zone central, while the other end zone has a frustoconical inner envelope and a cylindrical outer envelope contiguous to the cylindrical outer envelope of the central zone. 5 · Method according to any one of claims 1 to 4; characterized in that, during winding, the core is rotated on a horizontal or vertical axis. 6. Method according to any one of claims 1 to 5; characterized in that the rotation of the core is adjusted so that the wire is wound at a constant linear speed and tension. 7 · A method according to claim 6, characterized in that the rotation and the tension are adjustable independently of one another so as to adapt to a wide range of wire sizes. ’8. A method according to any one of claims 1 to 7; characterized in that the translation speed can be adjusted so that the pitch of the turns formed during any translation can be adjusted according to the size of the wire. 9 · Apparatus for winding a metal wire on a core, characterized in that it comprises a frame on which is mounted a rotary shaft provided with an adapter intended - 17 - »* drive driven by motor and intended to rotate the aforementioned shaft, a guide element provided for, routing the wire near the wire wound on the core and also to animate the wire in a translational movement along the latter, a retaining element intended to tension the wire to be wound on the core, as well as an adjustment element intended to gradually modify the translation of 11 guide element * 10. Apparatus according to claim 93 characterized in that the shaft can be rotated by the drive member when the core is in the horizontal position. 11. Apparatus according to claim 10, characterized in that the shaft comprises a support element that can be disengaged and provided for one end of the core, while a support element pivoting horizontally is provided for the other end of this core so that the latter can be brought into an upright position for loading and unloading. 12. Apparatus according to claim 11, characterized in that the pivoting support element comprises a lever arm and a double-acting piston / cylinder unit in order to facilitate the pivoting of the core between its horizontal position and its upright position . 13 · Apparatus according to any one of claims 9 to 12, characterized in that the guide element is mounted on a carriage which can move along a slide parallel to the shaft when it is rotated by the motor-driven drive element, while the limit switches mounted near the respective ends of the carriage and which can come into contact with respective stops mounted on a screw shaft extending parallel to the carriage slide, this screw shaft being able to rotate slowly and / or intermittently depending on the wire feed speed or the speed of rotation of the core shaft or the translation speed, thus gradually modifying the translation at both ends of the nucleus. 14 · Apparatus according to claim 13 "character— * rised in that the screw shaft comprises right and left pitch screws, a stop being provided on each screw. 15 · Apparatus according to any one of claims 9 to 14, characterized in that the retaining element intended to tension the wire to be wound is constituted by a winch provided with a wire guide and a brush, as well as several staggered rollers. 16. Spool of wire comprising a cylindrical tubular core provided with a plate or a plate at one end only, the wire coming to be wound on this core according to the method according to claim 2 or 3 · 17 · spool of wire comprising a core having a cylindrical tubular part, one end of which is integral with the smallest end of a frustoconical part, the wire being wound on the two parts of this core in accordance with the method according to claim 4 · 18. Coil of wire according to any one of claims 16 and 17, characterized in that the coiled wire is subjected to a bright annealing. - 19 - ß 19. Method for winding a wire on a core, essentially as described in the above specification with reference to the accompanying drawings 20. Apparatus for winding a wire over a core, substantially as described in the above specification with reference to the accompanying drawings. 21. Spool of wire, essentially as described in the above specification with reference to Figures 6 and 7 of the accompanying drawings. • auuh te