JP2002331327A - Method for manufacturing steel wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a steel wire capable of manufacturing a steel wire that can be applicable for a reinforcing member to rubber goods such as tires especially by lowering residual torsion of the steel wire when the steel wire is manufactured by drawing steel wire stock. SOLUTION: When the steel wire is manufactured by drawing the steel wire stock 3, the steel wire after the final wiredrawing passes through a plurality of rolls provided at staggered position, and then, the residual torsion lowering treatment that gives rotation in the opposite direction toward the wire shafting of the residual torsion which the steel wire possesses, is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a steel wire, and more particularly to a method of manufacturing a steel wire suitable for reinforcing a rubber article.

[0002]

2. Description of the Related Art In general, various characteristics are required for steel wires used for wire ropes, springs, tire cords, and the like. For example, with respect to recent environmental problems, it is required to promote particularly low fuel consumption of automobiles. In order to promote this fuel economy, there is an urgent need to reduce the weight of tires.Therefore, it is necessary to reduce the amount of rubber cord used around or around steel cords, which are relatively heavy among tire raw materials. Has been requested.

Here, in order to reduce the amount of steel cord used and the amount of rubber material around the steel cord, measures have been taken such as simplifying the twisted structure of the steel cord and reducing the diameter of the cord. For example, as a measure for simplifying a steel cord, a steel wire used for the cord may be directly used for reinforcing the tire.

[0004]

However, if a steel wire is applied to a tire as it is, it is controlled by twisting a plurality of the steel wires to form a cord. It is difficult to properly control the rotation, so-called residual torsion, and the residual torsion of the steel wire itself affects the flatness of the treat when manufacturing the tire, and the flat treat cannot be obtained. There was a drawback that the production of the product itself became difficult.

Accordingly, the present invention reduces the residual torsion of the steel wire when the steel wire is drawn to produce a steel wire, and is applied directly as a reinforcing material particularly to rubber articles such as tires. It is an object to propose a method for producing a steel strand that can be made.

[0006]

The gist of the present invention is as follows.
It is as follows. (1) A method for producing a steel wire, which comprises applying a residual torsion reduction treatment to the steel wire after the final drawing when the steel wire is drawn to produce a steel wire.

(2) In the above (1), when the residual torsion reduction treatment passes the steel wire after final drawing through a plurality of rolls arranged in a staggered manner, the steel wire after final drawing has A method for producing a steel strand, which is to give a rotation in a direction opposite to a direction around a strand axis of a residual torsion.

(3) The method for producing a steel wire according to the above (1), wherein the residual torsion reduction treatment is to apply a twist to the steel wire after the final drawing and then return the twist.

(4) In the above (3), after twisting is applied to the steel wire after the final drawing, after the twist is returned, the steel wire is further passed through a plurality of rolls arranged in a staggered manner. Production method.

(5) In producing a steel wire by drawing a steel wire, the steel wire after the final wire drawing is wound around a drawing capstan and then subjected to a residual torsion reduction treatment. Manufacturing method of steel wire.

(6) In the above (5), when the residual torsion reduction treatment is performed, when the steel strand is passed through a plurality of rolls arranged in a staggered manner, the residual torsion axis of the steel strand after the final drawing is provided. A method for producing a steel wire, which is to give a rotation in a direction opposite to the surrounding direction.

(7) In the above (5), the residual torsion reduction treatment is performed by rotating the steel wire around the auxiliary roll disposed on the outlet side of the drawing capstan in a direction opposite to the winding direction of the steel wire at the drawing capstan. A method of manufacturing a steel wire that is wound around.

(8) The method for producing a steel wire according to the above (7), wherein the steel wire is wound around an auxiliary roll and then passed through a plurality of rolls arranged in a staggered manner.

(9) The method for producing a steel wire according to the above (5), wherein the residual torsion reducing treatment is to apply a twist to the steel wire and then return the twist.

(10) A method for producing a steel wire according to the above (9), wherein after twisting the steel wire, the twist is returned, and then the steel wire is passed through a plurality of rolls arranged in a staggered manner.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A steel wire is obtained by subjecting a steel wire having a predetermined composition to wire drawing.
This wire drawing is performed in various forms.For example, in the case of producing a steel wire for a reinforcing cord of a rubber article such as a tire, a combination of a die and a drawing capstan is formed in a tank filled with a lubricating liquid. In addition, a multi-stage wet drawing method is adopted, in which a plurality of sets are stacked and arranged, and a wire is continuously drawn through each die and a drawing capstan in order.

[0017] The steel wire obtained through such a wire drawing process is subjected to uniform surface reduction on the periphery of the wire at the time of wire drawing in each die, for example, due to uneven wear of the inner surface of the die. In general, it has residual torsion because it is not wound or the drawing from the die is wound around a drawing capstan.

When the steel wire having the residual torsion is fixed at one end and the other end is free, the steel wire rotates in a specific direction around the axis of the wire, so that, for example, a treating material used for a tire belt. As described above, when a steel wire is used, the flatness of the treat material is hindered because the steel wire is not straightened, which is an obstacle to tire manufacturing. Therefore, especially when a steel wire is applied to a rubber article such as a tire, it is extremely important to reduce the residual torsion of the drawn steel wire, and the reduction of the residual torsion reinforces the rubber article. For the first time, a sound application as a material is possible.

Hereinafter, a method for reducing residual torsion in a steel wire will be described more specifically with reference to the drawings. That is, as shown in FIG. 1, the steel wire 3 is pulled out from the final wire drawing die 1 through the drawing capstan 2 arranged on the exit side of the final wire drawing die 1, so that the steel wire 3 becomes the final wire. Adjusted to diameter.

Since the drawn steel wire 3 has the residual torsion as described above, the steel wire 3 on the exit side of the drawing capstan 2 and a plurality of rolls 4
The step of passing a through the straightening roll group 4 arranged in a staggered manner is provided. At this time, the tilting roll 5 disposed on the exit side of the straightening roll group 4 is viewed from the steel wire drawing side, FIG.
As shown in (1), the steel wire 3 passing through the straightening roll group 4 is arranged to be inclined to either side of the pass line P, and the steel wire 3 passing through the straightening roll group 4 is guided to this tilting roll 5. Accordingly, the steel wire 3 passing through the straightening roll group 4 is rotated. The direction of this rotation is steel wire 3 immediately after the final wire drawing.
The residual torsion of the sample is measured in advance according to, for example, a method of measuring residual torsion in accordance with JIS G3510,
The direction around the element wire axis is set to the opposite direction, and the inclination direction of the tilting roll 5 is determined accordingly.

Thus, the steel wire 3 passing through the straightening roll group 4 is repeatedly subjected to bending work in different directions when passing through the roll group arranged in a staggered manner, thereby making the residual stress uniform. In addition, as a result of the strand being stretched under the light pressure between the rolls, the residual torsion is reduced. The reduction is achieved.

The steel wire 3 passing through the straightening roll group 4
In order to further reduce the residual torsion by rotating the steel wire, the inclination direction and the amount of inclination of the tilting roll 5 for guiding the steel wire 3 that has passed through the straightening roll group 4 are determined in the steel wire after drawing. It is advantageous to adjust appropriately according to the residual torsion.

The steel wire that has been subjected to the above-described residual torsion reduction processing is bundled in one or a plurality thereof, wound on a take-up spool, and stored, shipped, or provided for the next step. Further, in the case shown in FIG. 1, the steel wire 3 is drawn from the final wire drawing die by the drawing type capstan 2 of a winding type. Tension may be used.

Next, the remaining torsion reduction processing other than the above will be specifically described with reference to FIG. That is, a twisting device 6 in which two rolls 6a and 6b provided side by side are rotatably fixed to a base 6c is provided on the exit side of the final wire drawing die 1 or, when the drawing capstan 2 is used, on the exit side. Placed, two rolls 6a of the device 6
The steel wire 3 is passed through the steel wires 3 and 6b in a figure-eight shape, and then, by rotating the base 6c, a process of applying a twist to the steel wire 3 and then returning the twist is continuously given. Since the twist and the operation of returning the twist are to remove the strain forcibly introduced into the steel wire 3 immediately after the introduction, the stress distribution in the circumferential direction of the steel wire is made uniform during the series of operations. As a result, the strands are elongated, so that the residual torsion can be reduced.

In the above operation, the amount of torsion corresponding to the residual torsion in the steel wire immediately after drawing is first given, and then the same amount is returned, thereby advantageously reducing the residual torsion.

After performing the residual torsion reduction process by the twisting device 6, the straightening roll group 4 shown in FIG.
Alternatively, it is possible to further reduce the residual torsion by performing a residual torsion reduction process using the straightening roll group 4 and the tilting roll 5.

In particular, when the use of the drawing capstan 2 is premised, as shown in FIG. 3, the auxiliary roll 7 arranged on the exit side of the drawing capstan 2 It is advantageous to wind the steel strand 3 in a direction opposite to the winding direction of the strand 3. That is, as described above, when the steel wire 3 is wound around the drawing capstan 2 to obtain a pulling force from the die, the residual torsion is also generated by winding the steel wire 3 around the drawing capstan 2. Therefore, by adding the step of winding in the opposite direction to the winding direction by the auxiliary roll 7, it is possible to reduce the residual torsion caused by the winding by the drawing capstan 2. Therefore, it is preferable to use the auxiliary roll 7 having the same size as the drawing capstan 2.

After the residual torsion reducing process using the auxiliary roll 7, the residual torsion reducing process using the straightening roll group 4 or the straightening roll group 4 and the tilting roll 5 shown in FIG. Twisting device 6
The residual torsion can be further reduced by performing at least one of the residual torsion reduction processes described above.

[0029]

EXAMPLE A high-carbon steel wire having a diameter of 5.5 mm containing 0.80 wt% of carbon was dry-drawn to a diameter of about 1.4 mm, and then subjected to patenting and brass plating. Was given. Then, this wire rod is 0.25mm
The wet multi-stage drawing was performed so that Further, after the steel wire exiting from the final wire drawing die was wound around a drawn capstan, a residual torsion reduction treatment was performed under various conditions shown in Table 1. With respect to the steel wires thus obtained, the rotation property and the flatness of the treated material produced using each steel wire were evaluated. Table 1 also shows the evaluation results.

Here, the rotation of the steel wire is determined according to JIS G35.
The evaluation was made based on the residual torsion measured according to the method described in 6.8 of 10 (1986). As for the direction of rotation, the direction rotating clockwise is indicated as plus (+), and the direction rotating in the opposite direction is indicated as minus (-).

Further, the flatness of the treating material is set to 5
A rubber sheet having a width of 30 cm and a length of 1 m, which is embedded in rubber having a thickness of 1 mm at intervals of 0 pieces / 50 mm, is prepared.
The height at which the end of the rubber sheet was lifted was measured, and the measured value was used to evaluate flatness.

[0032]

[Table 1]

[0033]

According to the present invention, since the residual torsion unavoidably remaining in the drawn steel wire is advantageously reduced, it can be processed as a cord, especially as a reinforcing material for rubber articles such as tires. Therefore, it is possible to provide an extremely simple material that can be applied as it is and is suitable as this kind of reinforcing material.

[Brief description of the drawings]

FIG. 1 is a diagram showing a specific example of a residual torsion reduction process according to the present invention.

FIG. 2 is a diagram showing a specific example of a residual torsion reduction process according to the present invention.

FIG. 3 is a diagram showing a specific example of a residual torsion reduction process according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Final drawing die 2 Drawing capstan 3 Steel wire 4 Straightening roll group 5 Tilt roll 6 Twisting device 7 Auxiliary roll

Claims (10)

[Claims] 1. A method for producing a steel wire, comprising: when producing a steel wire by drawing a steel wire, performing a residual torsion reduction treatment on the steel wire after the final drawing. 2. The residual torsion of the steel wire after the final drawing when the steel wire after the final drawing is passed through a plurality of rolls arranged in a staggered manner in the residual torsion reducing treatment according to claim 1. A method for producing a steel wire, which is to give a rotation in a direction opposite to the direction of the wire around the wire axis. 3. The method for producing a steel wire according to claim 1, wherein the residual torsion reduction processing is to apply a twist to the steel wire after the final drawing and then return the twist. 4. The method for producing a steel wire according to claim 3, wherein a twist is given to the steel wire after the final drawing, and after the twist is returned, the steel wire is further passed through a plurality of rolls arranged in a staggered manner. . 5. A method for producing a steel wire by drawing a steel wire rod, wherein the steel wire after the final drawing is wound around a drawing capstan and then subjected to a residual torsion reduction treatment. Manufacturing method of steel wire. 6. The residual torsion reducing process according to claim 5, wherein when the steel wire is passed through a plurality of rolls arranged in a zigzag pattern, the residual torsion of the steel wire after the final drawing has an axis around the wire axis. A method for producing a steel wire, which is to give rotation in the direction opposite to the direction. 7. The residual torsion reducing process according to claim 5, wherein the steel wire is wound around the auxiliary roll disposed on the outlet side of the drawing capstan in a direction opposite to the winding direction of the steel wire in the drawing capstan. A method of manufacturing a steel wire. 8. The method for producing a steel wire according to claim 7, wherein the steel wire is wound around an auxiliary roll and then passed through a plurality of rolls arranged in a staggered manner. 9. The method of manufacturing a steel wire according to claim 5, wherein the residual torsion reduction processing is to apply a twist to the steel wire and then return the twist. 10. The method for producing a steel wire according to claim 9, wherein after twisting the steel wire, the twist is returned, and then the steel wire is passed through a plurality of rolls arranged in a staggered manner.