JPH04308288A - Production of steel cord and apparatus therefor - Google Patents

Abstract

PURPOSE:To easily produce a steel cord having small bent part on the element wire or the strand in one step. CONSTITUTION:At least on element wire a3 or strand among plural element wires a a1, a2 and a3 or strands is passed through bending pins 2 of a rotary bending means D rotating around the element wire a3 or strand. The bent wire, etc., is integrated with the other element wires a1 and a2 or strands at the collection point 1 of a collection means C and the integrated wires, etc., are twisted to obtain the objective steel cord.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a steel cord used as a reinforcing material for rubber products such as automobile tires and conveyor belts. The present invention relates to a new and stable steel cord manufacturing method and its manufacturing device.

0002

[Prior Art] Generally, this type of steel cord has a structure in which a plurality of wires are twisted together, and the steel cords are lined up in parallel and covered with a rubber material. It is used as a reinforcing material for belts, etc. Therefore, when a steel cord is used as a reinforcing material, an essential condition is that it has good adhesion to the rubber material. That is, in order for the steel cord to fully fulfill its role as a reinforcing material, it must form a complete composite with rubber. For example, in the case of tires, if the adhesion between the steel cord and rubber is poor, the steel cord and rubber will separate during driving, causing a so-called separation phenomenon, which can significantly impede the function of the tire, and may cause infiltration from outside air. Rust occurs in the strands due to moisture, etc., which causes problems such as significantly reducing the strength of the steel cord and accelerating the separation phenomenon.

[0003] Therefore, in order to improve the adhesion between the steel cord and the rubber, a plurality of steel cords are used as steel cords in which the rubber penetrates into the center of the steel cord and the rubber adheres to the entire circumference of the strands. Conventionally, types in which the wires are lightly twisted, types in which the number of strands around the core is thinned out, and types in which the core strands are thicker in diameter than the side strands are known.

[0004] When manufacturing this conventional steel cord, a method of imparting curl to the wires or strands to improve rubber penetration is to use cone pins coaxially with the rotating tube in a tubular type wire twisting machine. In double-twisting buncher-type wire twisting machines, fixed cone pins are installed in a part of the wire twisting machine or the cradle, and the strands or wires are passed between these cone pins and twisted while giving a normal twist. I was going.

[0005]

[Problem to be Solved by the Invention] By the way, when giving a small curl to a wire or a strand, as shown in FIG.
If the twist pitch P of the steel cord is not smaller than the twist pitch P of the steel cord, the rubber material will not penetrate sufficiently to the center of the steel cord. However, the above-described conventional steel cord manufacturing method can only impart a twist pitch twist to the steel cord, but cannot impart a smaller twist. Therefore, in a separate process, small curls are added to the wire or strand. Then, by combining multiple strands of these small curled wires,
Alternatively, it has been manufactured in a two-step process of combining and twisting these wires or strands with straight wires.

Furthermore, in conventional steel cords, each strand often floats in space or contacts other strands at only one point, making the twisting extremely unstable. Therefore, the gaps between the individual wires are not constant, and the wires tend to be biased to one side (defective twisting). As a result, the plurality of strands could not produce the effect as a unit, the mechanical properties were poor, and there were many places where rubber penetrated poorly.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and its object is to provide a wire or strand with small curls, good rubber penetration, and a twisted structure. It is an object of the present invention to provide a method for manufacturing a steel cord and an apparatus for manufacturing the same by which a stable steel cord can be manufactured in one step.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the gist of the present invention is to surround at least one wire or strand among a plurality of wires or strands. The first invention provides a method for manufacturing a steel cord, which is characterized in that the steel cord is passed between the shaping pins of a rotating rotating shaping means, and then collected and twisted together with other wires or strands at a gathering point, In the first invention, a method for manufacturing a steel cord is characterized in that a plurality of wires or strands collected and twisted at an assembly point are passed through a false twisting means and twisted together. In the second invention, the production of a steel cord is characterized in that the wires or strands passed through the rotating twisting means are passed through the temporary twisting means, and then gathered together with other wires or strands at a gathering point and twisted together. A third aspect of the present invention is a steel cord manufacturing apparatus comprising a feeding means, a gathering means, and a rotating body main body, wherein a wire or strand is disposed between at least one feeding reel of the feeding means and the gathering means. A fourth invention provides a steel cord manufacturing apparatus characterized in that a rotating curling means that rotates around the double-twisted buncher type steel cord manufacturing apparatus is provided, in which at least one of the feeding means is fed out. A steel cord manufacturing apparatus is provided, characterized in that a rotating twisting means that rotates around the wire or strand is provided between the reel and the collecting means, and a false twisting means is provided immediately after the collecting means. A sixth invention is a steel cord manufacturing apparatus characterized in that, in the fifth invention, a temporary twisting means is provided between the gathering means and the rotational shaping means.

In the present invention, the "gathering point" at which the wires or strands are gathered and twisted refers to the entrance portion when a small diameter gathering guide such as a voice is used as the gathering means.

[0010] Furthermore, a "strand" refers to a plurality of wires twisted together, and a plurality of these strands may be further twisted together, or a plurality of wires may be further twisted on top of this strand. Together, they form a steel cord, and in multi-layered steel cords, it is called the "core".
It is also sometimes called a "sheath".

[0011]

[Operation] In the present invention configured as described above, the wire or strand that has passed through the shaping pin of the rotating shaping means is spirally formed due to the synergistic effect of the effect of the shaping pin and the rotational effect of the shaping means. A small habit of the shape is given. Furthermore, if a temporary twisting means is provided at an appropriate location behind the rotational curling means, a small spiral curl can be more accurately imparted to the wire or strand. By twisting the wires or strands obtained in this way or with other almost straight wires or strands, it is possible to achieve good rubber infiltration throughout the steel cord and a stable twisted structure. Steel cord can be manufactured in one process.

0012

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings.

FIG. 1 is a schematic diagram showing an embodiment of the steel cord manufacturing apparatus of the present invention using a double-twisting buncher-type wire twisting machine.

In FIG. 1, A is a rotary body, a false twisting means B is arranged between it and a collecting means C arranged on the outside, and a rotating twisting means D is arranged between the collecting means C and the feeding means E. It will be arranged.

Next, three almost straight wires a1, a2, and a3 with a wire diameter of 0.3 mm were used, and one of them, a3, was given a small spiral shape to form a 1×3 wire. A method for manufacturing a steel cord of ×0.30 will be explained based on FIG. 1.

Of the three strands of wire individually fed out from the three feeding reels 1 of the feeding means E, the strands a1 and a
2 is led directly to the gathering means C, and the strand a3 is directed in the rotation direction x
The material is guided to the collecting means C through three 1 mm diameter cemented carbide setting pins 2 arranged in a staggered manner in the rotating setting means D which rotates at a speed of 15,000 per minute. The three wires introduced into the gathering means C and twisted together at the gathering point I are
2 of the false twisting means B rotating at 12000 per minute in the rotational direction y
After being wound around the overtwist rollers 3, it is guided through the turn roller 4 to the rotating body A that rotates at 5000 rotations per minute in the rotational direction y, and then through the turn rollers 5, 6, and 7 of the flyers 8 and 8. The steel cord S is wound onto a winding bobbin 11 via a capstan 10 on a cradle 9. Note that the winding speed was set so that the twist pitch P (see FIG. 8) was 10 mm.

The cross section of the steel cord S wound as described above is as shown in FIG.
Wire a3 (see Fig. 8) has a small wave-like spiral curl of about 4 mm, and other wires a1 and a
2, a suitable gap was maintained throughout the steel cord. In the figure, d indicates the wire diameter. Further, the elongation of each steel cord under a load of 5 kg was about 0.2% on average. Moreover, FIG. 5(b) is a diagram showing a cross section of a steel cord in which two strands are formed into a small spiral shape.

[0018] After the above-mentioned steel cord S was embedded with rubber used as tire belt coating rubber and vulcanized, a fatigue test was conducted, and the steel cords collected were
When examining the steel cord's buckling, fretting wear, and degree of rubber penetration inside the cord, it was found that all of these were superior to conventional steel cords.

FIGS. 2 and 3 are schematic configuration diagrams showing different embodiments of the steel cord manufacturing apparatus of the present invention when a twice-twisting buncher-type wire twisting machine is used. FIG. A temporary twisting means H and a false twisting means B are arranged before and after the collecting means C arranged on the outside, and a temporary twisting means H is arranged in front of the collecting means C.
3 has almost the same configuration as the embodiment shown in FIG. 2, and the difference from FIG. 2 is that the collecting means C and temporary twisting means A plurality of cone pins F are arranged at each strand running position between the means H and between the gathering means C and the feeding means E.

In the case of the embodiment shown in FIGS. 2 and 3 above,
Since the temporary twisting means H is provided immediately after the rotational twisting means D,
It is possible to accurately impart a large number of twists to the strands, and is ideal for manufacturing steel cords having strands or strands with extremely small spiral curls.

FIG. 4 is a schematic diagram showing an embodiment of the steel cord manufacturing apparatus of the present invention using a cylindrical wire twisting machine. A rotary shaping means D is arranged, and a divided batten G is provided near the external exit side.
, cone pin F, and collecting means C are arranged in this order.

[0022] In the above embodiment, the false twisting means B and the cone pin F perform twisting accurately, eliminate the repulsion (flare property) of the steel cord, and create a precise twisting pattern in the wire or strand according to the twisting pitch. Depending on the structure of the steel cord, it is possible to omit the false twisting means or to use only cone pins instead.

Further, although the false twisting means B is arranged outside the rotating body A, it can also be arranged on the cradle 9 inside the rotating body A. However, the false twisting means B is the gathering means C.
It is better to form the twist more stably if it is provided immediately after. This is because the pitch of the twist is related to the twist of the wire and the wire speed, so the twist of the wire can be forcibly kept constant at all times by the false twisting means. In other words, if the false twisting means is not immediately after the gathering means, the twist of the wire will change depending on the untwisting of the wire (backflow of twist caused by the rotation of the rotating body), and the pitch of the twist will change. This is because it changes.

Furthermore, in the above embodiment, the feeding means E,
Although the rotating twisting means D, the temporary twisting means H, the gathering means C, and the false twisting means B are arranged outside the rotating body A, all or part of these means are arranged inside the rotating body A. It is also possible.

[0025] When a plurality of wires or strands are to be shaped in a small spiral manner, a rotational shaping means D may be provided for each wire or strand.
It is also possible to simultaneously guide a plurality of pieces to one rotating shaping means D and to apply a small spiral shape to a plurality of pieces at the same time.

By the way, in the embodiment shown in FIGS. 1 to 4, 1
This is an example of manufacturing a steel cord of ×3. steel cords can be manufactured, and at the same time, it is also possible to manufacture so-called bundle-twisted steel cords in which a larger number (for example, about 12 to 27 cords) are twisted together in one process.

[0027]Also, the straightening means rotates at a high speed compared to the rotating body and the false twisting means, and by adjusting the rotation speed according to the feeding speed of the wire or strand,
A small spiral-like twist with a pitch different from that of steel cord can be freely imparted.

Further, the wave height of the small spiral curl can be freely adjusted by changing the arrangement of the staggered curl pins.

Further, in each of the above embodiments, the direction of rotation of the curling means is opposite to that of the rotating body and the false twisting means, but the small spiral curling to be imparted to the wire or strand is made of steel. It can be set freely depending on whether the direction is the same as the twisting direction of the cord or the opposite direction.

Further, the two overtwist rollers used for the false twisting means and the temporary twisting means can sometimes be replaced with one overtwist roller.

[0031]

Effects of the Invention According to the present invention, a steel cord having small spiral curls in its wires or strands can be manufactured in one step. Further, by appropriately arranging the temporary twisting means, it is possible to more accurately impart a small spiral shape to the wire or strand. As a result, various types of steel cords consisting of a large number of cords with good rubber penetration and a stable twisted structure can be manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a steel cord manufacturing apparatus of the present invention.

FIG. 2 is a schematic configuration diagram showing a different embodiment of the steel cord manufacturing apparatus of the present invention.

FIG. 3 is a schematic configuration diagram showing a different embodiment from FIG. 2 of the steel cord manufacturing apparatus of the present invention.

FIG. 4 is a schematic configuration diagram showing still another embodiment of the steel cord manufacturing apparatus of the present invention.

5A and 5B are cross-sectional views of a 1×3 steel cord obtained by the steel cord manufacturing apparatus of the present invention.

FIGS. 6A to 6D are cross-sectional views of a steel cord having a small spiral shape and consisting of a large number of wires or strands.

FIG. 7 is a cross-sectional view of a 1×5 steel cord with small spiral curls.

FIG. 8 is a front view of FIG. 7;

[Explanation of symbols]

1...Feeding reel 2...Cutting pin 3...Over twist roller 4, 5, 6, 7...Turn roller 8...Flyer 9...Cradle 10...Capstan 11... Winding bobbin a1, a2, a3...Element wire A...Rotating body body B...False twisting means C...Collection means D...Rotation biasing means E...Feeding means F...Cone pin G...Division plate H...temporary twisting means I...Assemblage point S...Steel cord

Claims (6)

[Claims] 1. After passing at least one of the plurality of wires or strands between the shaping pins of a rotating shaping means that rotates around the wire or strand, A method for manufacturing a steel cord characterized by gathering and twisting other wires or strands at a gathering point. 2. The method for manufacturing a steel cord according to claim 1, wherein the plurality of wires or strands collected and twisted together at an assembly point are passed through a false twisting means and twisted together. 3. The wire or strand according to claim 2, wherein the wire or strand passed through the rotating twisting means is passed through the temporary twisting means, and then collected and twisted together with other wires or strands at a gathering point. Steel cord manufacturing method 4. A steel cord manufacturing apparatus comprising a feeding means, a gathering means, and a rotating body main body, wherein a wire or strand is wound around the wire or strand between at least one feeding reel of the feeding means and the gathering means. A steel cord manufacturing device characterized by being provided with a rotating rotation shaping means. 5. In a twice-twisted buncher type steel cord manufacturing apparatus, a rotating shaping means that rotates around the wire or strand is provided between at least one payout reel of the payout means and the gathering means. , and a steel cord manufacturing apparatus characterized in that a false twisting means is provided immediately after the gathering means. 6. The steel cord manufacturing apparatus according to claim 5, wherein a temporary twisting means is provided between the gathering means and the rotational shaping means.