JP3622099B2 - Steel cord manufacturing method and manufacturing apparatus thereof - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method and an apparatus for manufacturing a steel cord used as a reinforcing material for rubber products such as automobile tires and conveyor belts.
[0002]
[Prior art]
In general, steel cords for automobile tires are covered with a rubber material in a state where a large number of steel cords are arranged in parallel and used as a reinforcing material.
Conventional steel cords have a so-called closed twisted structure in which 3 to 7 strands are in close contact with each other and twisted together. However, since this type of steel cord has a cavity in the center of the steel cord, when forming a composite sheet using the steel cord and two rubber sheets, the rubber material penetrates into the cavity. Without completely covering the outer periphery of the steel cord, a complete composite with the rubber material cannot be formed. Therefore, in an automobile tire using the above steel cord, the rubber material and the steel cord are not sufficiently bonded, and the rubber material and the steel cord are peeled off during driving of the automobile, causing a so-called separates phenomenon, and the function of the tire is marked In addition to hindering, moisture in the rubber material and moisture that has penetrated from the notch of the tire reaches the cavity inside the cord and propagates in the longitudinal direction of the cord to corrode the steel cord, greatly reducing the mechanical strength. become.
[0003]
In order to solve the above-mentioned problem, one or more strands are passed through the strands between the meshing tooth surfaces of the pair of gear-shaped molding elements, and the strands are subjected to zigzag planar waveform molding in the longitudinal direction and other strands. By twisting together almost straight strands that have not been flat-plate shaped, a gap is formed between the mold part and the straight part or the mold part, from which the rubber material is made of steel cord. There has been proposed a steel cord that penetrates inside (Japanese Patent Laid-Open No. 2-307994).
[0004]
However, since the steel cord passes the strand between the meshing tooth surfaces of the pair of gear-shaped molding elements, the strand is damaged, and the adhesive film with the rubber applied to the steel cord is peeled off. As a result, there is a problem that the adhesiveness with the rubber is lowered.
[0005]
Furthermore, in the molding means for passing the strands between the meshing tooth surfaces of the gear-shaped molding element, the strands are partially processed, and the processed portion and the non-processed portion coexist, and the processed portion is Strength decreases. When twisted with a buncher type stranding machine, twisting concentrates on the areas where the corrugated and peaked peaks and troughs are reduced in strength, and the fatigue resistance of these parts is greatly reduced, and the entire steel cord There was a problem that the fatigue resistance of the steel also decreased.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems, and the object of the present invention is to provide a steel cord for rubber reinforcement that does not deteriorate fatigue resistance and has excellent rubber penetration into the steel cord. To provide a manufacturing method and a manufacturing apparatus.
[0007]
[Means for Solving the Problems]
To achieve the above object, according to the present invention, in a steel cord composed of n (n = 3 to 7) strands having the same wire diameter, at least one strand is rotated around the strand. The first invention is a method of manufacturing a steel cord, characterized in that the steel cord is passed through between the squeezing pins of the rotating squeezing means, then rolled, and then assembled and twisted together with other strands at the set point. In a manufacturing apparatus comprising a steel cord feeding means, a gathering means, and a rotating body main body composed of n (n = 3 to 7) wires having the same wire diameter, at least one feeding reel of the feeding means A steel cord manufacturing apparatus characterized in that a rotating cording means for rotating around the strands and a rolling means in which a plurality of rollers are arranged in a staggered manner are provided between the first and second collecting means. Invention.
Further, in a steel cord buncher type manufacturing apparatus comprising n (n = 3 to 7) strands of the same wire diameter, between the at least one feeding reel of the feeding means and the collecting means, A steel cord manufacturing apparatus is provided with a rotating cording means for rotating around a strand, and a rolling means having a plurality of rollers arranged in a staggered manner immediately after the rotating tacking means. It is set as invention of 3.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
First, at least one strand out of n strands (n = 3 to 7) of the same wire diameter is passed between the bracing pins of a rotating bracing machine that rotates around the strands, First, the spiral-shaped corrugation is performed, and then the spiral-shaped corrugated wire is passed through a rolling mill in which a plurality of rollers are arranged in a staggered manner to roll the spiral-shaped wire into a flat corrugated shape. . The strands and the substantially straight strands that do not pass through other rotary setting machines and rolling mills are gathered at a set point provided thereafter, false twisted by a false twister, and then twisted by a rotating body.
[0009]
The pitch of the spiral shape can be adjusted by the rotation speed of the brazing machine and the speed at which the wire passes between the pins. The pitch decreases as the rotation speed increases, the pitch increases as the rotation speed decreases, and the pitch increases as the speed increases. Becomes smaller when lowered. Further, the wave height of the spiral shape can be adjusted by the distance between the pins attached to the rotating clasp, and the wave height H decreases as the distance between the pins increases.
[0010]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
FIG. 1 is a schematic configuration diagram showing an embodiment of a steel cord manufacturing apparatus of the present invention when a buncher type twisting machine is used.
[0012]
In FIG. 1, E is a false twisting means, F is a main body of a rotating body, and the rotating means B and the rolling means C are arranged between the collecting means D and the feeding means A arranged on the outside thereof, and the feeding means A and the rotating means. The attaching means B, the rolling means C, and the gathering means D are arranged in this order.
Next, of the three strands having a wire diameter of 0.35 mm individually fed from the three feeding reels 1, the strands a ₁ and a ₃ are directly led to the assembly means D, and the strand a ₂ is 3 Roll having a 10 mmφ rolling roll 3 arranged in a staggered form after obtaining a spiral strand through a rotating brazing means B provided with a 1 mmφ cemented carbide brazing pin 3 After rolling to a plane wave shape through means C, the three strands a ₁ , a ₂ , a ₃ are gathered by the gathering means D, then false twisted by the false twisting means E, They are twisted together by the rotating body F and wound on the take-up reel 4.
[0013]
The cross-section of the steel cord S wound up as described above is as shown in FIG. 2, and there is a suitable gap between the a ₂ having a plane wave shape and the other strands a ₁ and a _3. It was kept throughout.
[0014]
The steel cord S is embedded in rubber used as a belt coating rubber for tires, vulcanized, and subjected to a fatigue test. With the collected steel cord, steel cord buckling, fretting wear, and rubber penetration into the cord When the degree was examined, it was found that both were superior to the conventional steel cord with a zigzag corrugation.
[0015]
【The invention's effect】
According to the present invention, a steel cord excellent in rubber penetration into the steel cord can be produced without reducing fatigue resistance.
[0016]
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of a steel cord manufacturing apparatus according to the present invention.
FIG. 2 is a cross-sectional view of a steel cord having a 1 × 3 structure obtained by the steel cord manufacturing apparatus of the present invention.
[Explanation of symbols]
A · · · feeding means B · · · imprint unit C · · · rolling means D · · · collection means E · · · false twist unit F · · · rotary body _{a 1, a 2, a 3} ··· Wire 1 ... Feeding reel 2 ... Fixing pin 3 ... Rolling roll 4 ... Winding reel S ... Steel cord

Claims (3)

In a steel cord composed of n (n = 3 to 7) strands having the same wire diameter, at least one strand is placed between the bracing pins of the rotating bracing means that rotates around the strand. A method for producing a steel cord characterized by rolling after rolling and then gathering and twisting together with other strands at a gathering point. In a manufacturing apparatus comprising a steel cord feeding means, a gathering means, and a rotating body main body composed of n pieces (n = 3 to 7) of the same wire diameter, at least one of the feeding means. An apparatus for producing a steel cord, characterized in that there is provided between the wire feeding reel and the gathering means, a rotating squeezing means for rotating around the strands and a rolling means having a plurality of rollers arranged in a staggered manner. . In a steel cord buncher-type manufacturing apparatus made of n wires (n = 3 to 7) having the same wire diameter, between the feeding reel and the collecting device of at least one of the feeding devices, An apparatus for producing a steel cord, characterized in that a rotating kneading means for rotating around a wire is provided, and a rolling means having a plurality of rollers arranged in a staggered manner is provided immediately after the rotating kneading means.

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