JP4045032B2 - Manufacturing method of steel cord for reinforcing rubber products - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method for manufacturing a steel cord for reinforcing rubber products used as a reinforcing material for rubber products such as automobile tires and conveyor belts, and is flat, lateral (width direction) and longitudinal (thickness). The direction of the corrugated steel cord can be formed easily and efficiently with high accuracy.
[0002]
[Prior art]
Steel cords for reinforcing rubber products are generally made by twisting together multiple cord strands, but it is effective in improving the strength of cord strands, reducing weight, and reducing steel cord manufacturing costs. The reason is that the performance of the tire can be remarkably improved because the steel cord is thin, and the bending rigidity is anisotropic, the bending rigidity in the lateral direction is high, and the bending rigidity in the vertical direction is small. From the above, the steel cord formed by arranging a plurality of cord strands in a plane and aligning them and winding a thin wrapping strand in a spiral shape has been developed and put to practical use. Examples of this are those described in JP-A-62-149929 and JP-A-63-240402. As shown in FIGS. 7 and 8, this is a simple structure in which a plurality of straight cords 1 are aligned on a plane, and a wrapping strand 2 is wound around them. Therefore, problems such as low fatigue strength remain. In order to improve the characteristics of this, it is known that the cord strand is corrugated to increase the longitudinal elasticity of the steel cord (Japanese Patent Laid-Open No. Hei 8-120578).
In the above conventional one, it is certain that the elasticity in the longitudinal direction is increased, but the following problems remain.
That is, the wrapping strand protrudes from the surface of the steel cord by the thickness (for example, 0.15 mm), and since there is no entanglement with the cord, the flexibility in the longitudinal direction of the cord with respect to the cord surface of the wrapping strand Therefore, it is weak against ironing, has an unstable shape, and it is easy to break the wrapping wire due to rubbing with a guide or the like during winding or unwinding of the cord, resulting in poor handling workability. Also, the wrapping strands and cords are rubbed when the tire is running, causing fretting wear.
In addition, the cord width increases by the amount of the wrapping wire protruding from the side surface of the cord, and although the wire diameter of the wrapping wire is small, several hundreds are aligned, so to the tire for increasing the cord width The effect of a decrease in the number of embeddings is large. In order to solve the problem of this conventional example, the wrapping strand does not protrude from the cord surface, and the width direction of the steel cord (lateral direction) can be reduced so that the flexibility in the longitudinal direction of the wrapping strand can be reduced. ) And the thickness direction (longitudinal direction), and a steel cord having a novel structure in which a wrapping element wire is wound along a corrugated valley. The steel cord of this new structure is a flat structure with the wrapping wire wrapped around it in a state where the waveforms in the horizontal direction (steel cord width direction) and longitudinal direction (steel cord thickness direction) are aligned. Therefore, it is difficult to mold the flat shape due to the tightening force of the wrapping wire, etc., and it is a problem in manufacturing technology how to mold this accurately and efficiently As left.
[0003]
[Problems to be solved by the invention]
The means of the present invention is the one in which a plurality of cord strands are arranged in a plane and aligned, and a wrapping strand is wound around the cord strands in the width direction (lateral direction) and the thickness direction (longitudinal direction) of the steel cord. An object of the present invention is to devise a manufacturing method so as to efficiently and efficiently form a steel cord which has a corrugated shape and is wound with a wrapping element wire along a corrugated trough.
[0004]
[Means for Solving the Problems]
The means taken to solve the above problem is that a plurality of cord strands are aligned in a plane and the wrapping strands are wound around the steel cord in the width direction (lateral direction) and the thickness direction. The manufacturing method of the steel cord in which the corrugation is applied in the (vertical direction) and the wrapping element wire is wound along the trough portion of the corrugation is constituted by the following elements (a) and (b).
(B) applying a horizontal corrugation to each cord wire, wrapping the wrapping wire at the same pitch as the corrugation, while aligning the phase of the corrugation and aligning a plurality of cord wires;
(B) Pressing the steel cord wrapped with the wrapping element wire to make it flat and make the vertical waveform wrinkle at the same pitch.
[0005]
[Operation]
By applying a horizontal corrugation to each code strand, aligning the phase of the corrugation and aligning multiple cord strands, and winding the wrapping strand at the same pitch as the horizontal corrugation The wrapping strand is wound around the corrugated valley and the plurality of cord strands are bundled. The steel cord is pressed in the vertical direction (thickness direction) by, for example, a large number of pressing rollers arranged vertically in a zigzag pattern to flatten it, and the vertical pitch (thickness direction) has the same pitch. The steel cord becomes a corrugated steel cord in the horizontal direction (width direction) and the vertical direction (thickness direction).
The steel cord formed as described above becomes a corrugated steel cord having the same pitch in the width direction and the thickness direction, and the wrapping strands in both the horizontal direction (width direction) and the vertical direction (thickness direction) are It fits into the corrugated trough and fits inside the apparent outer surface of the steel cord.
Since the horizontal corrugation process is performed at the stage of the cord strand, the lateral corrugation is applied very easily, easily and accurately, and the cord strand with the corrugation of this waveform is applied. If the wrapping wire is wound at the same pitch while aligning the pitch, the wrapping wire is naturally fitted in the valley of the corrugation, so the winding operation of the wrapping wire can be performed efficiently and efficiently. In addition, at this stage, the wrapping wire is fitted in the trough portion of the corrugation in the lateral direction, and is thus engaged with the cord in a stable state in the longitudinal direction.
As described above, the wrapping strands fit into the valleys of the corrugations in the horizontal direction and are wound firmly and stably, and a plurality of cord strands bundled together are flattened through a pressing means such as a pressing roller. In addition, since the corrugation in the vertical direction (thickness direction) is applied to this, the wrapping wire does not slip in the longitudinal direction of the steel cord when the corrugation is applied in the vertical direction, and the accuracy is ensured. The wrapping element wire is surely fitted into the trough portion of the vertical waveform formed by the pressing means, which is well flat.
In addition, since the waveform corrugation of the horizontal direction attached | subjected to a code | cord strand will show said effect | action as long as it is a waveform on a plane, it may be a small spiral habit other than what is called a corrugation.
[0006]
【Example】
Next, embodiments will be described with reference to the drawings.
The steel cord for reinforcing rubber products in this example is obtained by winding a wrapping strand 2 around three cord strands 1 and arranging them on a flat surface, and the cord strand diameter is 0.3 mm. The diameter is 0.15 mm. Each of the cord strands is provided with a wave shape in the horizontal direction (see FIGS. 2 and 4) having a wave height of 0.5 mm and a pitch of 5 mm, and then a wrapping strand is wound at a winding pitch of 5 mm. In a state where the wrapping strand is wound, the steel cord is flattened by being pressed in the vertical direction, and the steel cord is provided with a vertical corrugation (see FIGS. 1 and 3) with a pitch of 5 mm.
The wrapping strands are wound along the vertical corrugated trough and in the lateral corrugated trough, and the relationship between the cord and the wrapping strand is as shown in FIGS. . That is, the wrapping strand is at one end of the steel cord in the AA cross section of FIG. 4 (FIG. 5, AA), and is on the back side of the steel cord in the BB cross section (FIG. 5, BB). , At the other end of the steel cord in the CC cross section (FIG. 5, CC) and further on the surface of the steel cord in the DD cross section (FIG. 5, DD). Thus, since the wrapping element wire 2 is within the apparent thickness T of the steel cord, it is contained inside the apparent front and back surfaces of the steel cord (FIG. 5, BB, DD), and The wrapping wire is wound along the corrugated trough in the horizontal direction and is within the apparent width W of the steel cord, so that it is inside the apparent side surface of the steel cord (FIG. 5, AA, CC).
The cord wire 1 fed out from the three feeding reels 61 is combed through the corrugating device 62, and the three cord cords are finally passed through the lapping machine 63 and further passed through the pressing device 64, and finally wound. Take up with the take-up reel 65. The wrapping machine 63 draws the three cord strands in a state where the phases of the corrugation are aligned, and the wrapping strand 2 is wound relatively loosely around the trough portion of the corrugation at the same pitch as the corrugation. Bundled. By passing through the pressing device 64 in which five rollers are arranged in a staggered manner up and down, the one bundled in this way is pressed in the vertical direction to be formed into a flat shape and the vertical corrugation is attached, As a result, a steel cord is formed which is flat and corrugated in the longitudinal direction (thickness direction). At this time, the winding pitch of the wrapping wire is equal to the pitch of the corrugation in the longitudinal direction (thickness direction), and the wrapping wire is fitted into the corrugated valley along the valley.
The above embodiment is an example of a manufacturing method in which the cord strands are arranged in a horizontal row to form a single row. For example, when manufacturing a cord in which three cord strands are stacked in two stages, a flat steel The width of the cord may be regulated to three cord strands by the pressing roller of the pressing device, and the six cord strands bundled by the wrapping strand may be passed through the pressing device by the pressing roller.
[0007]
[Effect]
With the wrapping wire wrapped around the corrugated cord cord, it is passed through a presser and flattened simultaneously with the vertical (thickness direction) corrugation Therefore, the wrapping wire does not shift in the longitudinal direction with respect to the cord, and therefore the forming accuracy is high and the shape of the finished steel cord is stabilized.
In addition, corrugation processing is applied at the stage of the cord strand, and the wrapping strands are aligned and aligned with a wrapping machine, and the wrapping strands are wound and bundled, so the workability and work efficiency are excellent. Since the flattening process and the vertical (thickness direction) corrugation process are performed through the press with the wrapping wire wound as described above, the flattening process and the vertical direction (thickness direction) ) Corrugation process is performed stably and efficiently.
The steel cord made by the above manufacturing method has the following advantages.
Since the wrapping wire is wound around the trough portion of the cord that is corrugated, the wrapping wire is firmly fixed, the shape of the steel cord itself is stabilized, and the handling workability is improved.
In addition, since the wrapping strands are fitted in the corrugated troughs in the longitudinal and lateral directions of the cord, the wrapping strands do not slide in the longitudinal direction of the cord and cause fretting wear. Since it is avoided that an excessive force is applied to the wrapping wire due to winding or unwinding, the problem that the wrapping wire is broken does not occur.
Furthermore, since the wrapping wire is fitted in the corrugated valleys in the vertical and horizontal directions, the steel cord width dimension and thickness increase due to the wrapping wire protruding from the cord surface can be avoided. As a result, the number of steel cords per unit width that can be embedded in the rubber product can be increased, and the reinforcing strength thereof can be increased.
[Brief description of the drawings]
FIG. 1 is a front view of a flat rubber cord for reinforcing a rubber product in which corrugation is applied in a horizontal direction and a vertical direction, and a wrapping element wire is wound thereon.
FIG. 2 is a plan view of the steel cord for reinforcing rubber products of FIG.
FIG. 3 is a partially enlarged view of FIG. 1;
4 is a partially enlarged view of FIG. 2;
5 is a cross-sectional view of each cross section in FIG. 4;
FIG. 6 is a front view of an embodiment of the present invention.
FIG. 7 is a plan view of a conventional steel cord for reinforcing rubber products.
8 is a cross-sectional view showing a use state of a rubber product reinforced with a steel cord for reinforcing a rubber product in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cord strand 2 ... Wrapping strand 61 ... Feeding reel 62 ... Corrugating device 63 ... Wrapping machine 64 ... Presser 65 ... Winding reel T .. Apparent thickness of steel cord W ... Apparent width of steel cord

Claims (4)

A plurality of cord strands are arranged in a flat line and wrapped with wrapping strands. Corrugation is applied in the width direction and thickness direction of the steel cord, and wrapping is performed along the troughs of the corrugations. In the manufacturing method of steel cords wound with wire,
Applying a horizontal corrugation or a spiral in the individual cord strands with a whisker, and using a wrapping machine, aligning the habit phases and aligning multiple cord strands, the same pitch as the above whisker Wrap the wrapping wire with
A method of manufacturing a steel cord for reinforcing rubber products by pressing a steel cord wrapped with wrapping and flattening the steel cord, and applying a horizontal corrugation and a vertical corrugation in the vertical direction with a pressing device. . After a plurality of cord strands having a strand diameter of 0.1 mm to 0.40 mm are corrugated or substantially spiral-shaped, the phases of the strands are aligned and guided to a wrapping machine. A method of manufacturing a steel cord for reinforcing a rubber product, in which a wire is wound, and then the cord strands are juxtaposed on the same plane through a pressing device and are pressed so as to be corrugated in the thickness direction. The method of manufacturing a steel cord for reinforcing rubber products according to claim 1 or 2, wherein a wrapping element wire is attached to the corrugation of the horizontal corrugation or spiral and the vertical valley. The method for producing a steel cord for reinforcing a rubber product according to claim 1 or 2, wherein the wrapping element wire is wound so as to fit in the horizontal corrugation or spiral, and in the vertical wave height.

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