JP4860051B2 - Manufacturing method of steel wire - Google Patents

Description

【００３３】
【発明の効果】
この発明によれば、伸線加工後の鋼素線に不可避に残存する残留トーションを有利に低減するから、とりわけタイヤなどのゴム物品の補強材として、コードなどとして加工することなく、そのまま適用することが可能であり、この種の補強材として適合する極めて簡素な素材を提供できる。
【図面の簡単な説明】
【図１】 この発明の残留トーション低減処理の具体例を示す図である。
【図２】 この発明の残留トーション低減処理の具体例を示す図である。
【図３】 この発明の残留トーション低減処理の具体例を示す図である。
【符号の説明】
１ 最終伸線ダイス
２ 引抜きキャプスタン
３ 鋼素線
４ 矯正ロール群
５ 傾動ロール
６ 捻回装置
７ 補助ロール[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a steel wire, and more particularly to a method for manufacturing a steel wire suitable for a reinforcing material for rubber articles.
[0002]
[Prior art]
Generally, various properties are required for steel wires used for wire ropes, springs, tire cords, and the like. For example, in recent years, environmental issues have been demanded in particular to promote lower fuel consumption of automobiles. In order to promote this reduction in fuel consumption, it is urgently necessary to reduce the weight of tires. Therefore, among the tire raw materials, the use of steel cords, which are relatively heavy, or the rubber materials used around them are reduced. It is requested.
[0003]
Here, in order to reduce the amount of steel cord used and the surrounding rubber material, measures such as simplifying the twisted structure of the steel cord or reducing the diameter of the cord are taken. For example, as a measure for simplifying the steel cord, it is conceivable to use the steel wire used for the cord as it is for reinforcing the tire.
[0004]
[Problems to be solved by the invention]
However, when steel strands are applied to tires as they are, the rotation, so-called residual torsion, that has been controlled by twisting a plurality of steel strands into cords, is properly controlled. It is difficult to control, and the residual torsion of the steel wire itself affects the flatness of the treat when manufacturing the tire, and since the flat treat cannot be obtained, the manufacture of the tire itself is difficult. there were.
[0005]
Therefore, when the steel wire is manufactured by drawing the steel wire, the present invention reduces the residual torsion of the steel wire and can be directly applied as a reinforcing material for rubber articles such as tires. The aim is to propose a method for producing possible steel strands.
[0006]
[Means for Solving the Problems]
The gist configuration of the present invention is as follows.
(1) When producing steel strands by drawing steel wire rods, they are placed on the exit side of the plurality of rolls on the steel strands after the final drawing while passing through a plurality of rolls arranged in a staggered pattern. A method of manufacturing a steel wire, comprising subjecting the steel wire after the final wire drawing to rotation in the direction opposite to the direction around the wire axis by the tilted roll, and applying a residual torsion reduction treatment.
[0007]
(2) In producing a steel wire by drawing a steel wire rod, the final wire is passed through a plurality of rolls arranged in a staggered pattern after the steel wire after the final drawing is wound around a drawn capstan. The steel wire after the wire is rotated in the direction opposite to the direction around the wire axis of the residual torsion of the steel wire after the final wire drawing by the tilting roll arranged on the exit side of the plurality of rolls, and the residual torsion A method of manufacturing a steel wire characterized by performing a reduction treatment .
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Now, a steel strand is obtained by performing a wire drawing process to the steel wire which becomes a predetermined component composition. This wire drawing is performed in various forms. For example, in the manufacture of a steel wire for reinforcing cords of rubber articles such as tires, a combination of a die and a drawing capstan is used in a tank filled with a lubricating liquid. In addition, a multi-stage wet wire drawing method is employed in which a plurality of sets are stacked and wire drawing is continuously performed through the wire in order to each die and the drawing capstan.
[0017]
The steel wire obtained through such a drawing process must not be uniformly reduced on the circumference of the wire due to, for example, uneven wear on the inner surface of the die at the time of drawing in individual dies. Alternatively, since the drawing from the die is performed by winding the die around a drawing capstan, it is common to have residual torsion.
[0018]
The steel wire having the residual torsion rotates in a specific direction around the axis of the wire when one end is fixed and the other end is free. For example, the steel wire is applied to a treating material used for a tire belt. As described above, when the wire is applied, the flatness of the treating material is hindered because the steel wire does not become straight, and this becomes an obstacle in manufacturing the tire. Accordingly, particularly when steel strands are applied to rubber articles such as tires, it is extremely important to reduce the residual torsion of the steel strands after drawing, and the reinforcement of the rubber articles by reducing the residual torsion. For the first time, sound application as a material becomes possible.
[0019]
Hereinafter, a method for reducing the residual torsion in the steel wire will be described more specifically with reference to the drawings.
That is, as shown in FIG. 1, by pulling the steel wire 3 from the final wire drawing die 1 through the drawing capstan 2 arranged on the exit side of the final wire drawing die 1, the steel wire 3 becomes the final wire. It is adjusted to the diameter.
[0020]
Since the steel strand 3 that has undergone this wire drawing process has residual torsion as described above, the straightening roll group in which the steel strand 3 is further disposed on the exit side of the drawing capstan 2 and a plurality of rolls 4a are arranged in a staggered pattern. Step 4 is given. At that time, the tilting roll 5 arranged on the exit side of the straightening roll group 4 is viewed from the drawing side of the steel strand, and as shown in FIG. The steel wire 3 that has passed through the straightening roll group 4 is rotated by guiding the steel strand 3 that has passed through the straightening roll group 4 to the tilting roll 5 by tilting to either side of the pass line P. give. The direction of this rotation is determined by measuring the residual torsion of the steel wire 3 immediately after the final wire drawing in advance, for example, in accordance with the method for measuring the residual torsion in accordance with JISG3510, Accordingly, the tilt direction of the tilt roll 5 is determined.
[0021]
Thus, in addition to uniformizing the residual stress, the steel strand 3 passing through the straightening roll group 4 is repeatedly given bending processes in different directions when passing through the roll group arranged in a staggered pattern. As a result of the wire being stretched under light pressure between the rolls, the residual torsion is reduced, and further, the rotation of the residual torsion and the rotation in the opposite direction are given, so that the residual torsion is further reduced. It is taken off.
[0022]
In addition, in order to further rotate the steel strand 3 passing through the straightening roll group 4 and further reduce the residual torsion, the tilt direction of the tilting roll 5 that guides the steel strand 3 that has passed through the straightening roll group 4 In addition, it is advantageous to appropriately adjust the amount of inclination according to the residual torsion in the steel strand after drawing.
[0023]
Note that one or more steel strands that have undergone the above-described residual torsion reduction treatment are bundled and wound on a take-up spool for storage, shipment, or subsequent processing. Further, in the example shown in FIG. 1, the steel wire 3 is drawn from the final wire drawing die by the winding-type drawing capstan 2, but for example, by a winding drum that finally winds the steel wire. Tension may be used.
[0024]
Next, residual torsion reduction processing other than that described above will be specifically described with reference to FIG. That is, when using the drawing capstan 2 on the exit side of the final wire drawing die 1, the twisting device 6 in which two rolls 6a and 6b provided in parallel are rotatably fixed to the base 6c. After the steel wire 3 is passed through the two rolls 6a and 6b of the device 6 in the shape of figure 8, the base 6c is rotated to twist the steel wire 3 and then twist it. Is given continuously. Since this twisting and returning operation is to remove the strain introduced forcibly into the steel wire 3 immediately after the introduction, the stress distribution in the circumferential direction of the steel wire is made uniform in the course of this series of operations. In addition, as a result of the strands being stretched, it is possible to reduce residual torsion.
[0025]
Note that the above operation can advantageously achieve a reduction in residual torsion by giving a twisting amount corresponding to the residual torsion in the steel wire immediately after drawing and then returning the same amount.
[0026]
In addition, after performing the residual torsion reduction process by the twisting device 6, the residual torsion reduction process by the correction roll group 4 or the correction roll group 4 and the tilting roll 5 illustrated in FIG. Reduction can also be achieved.
[0027]
In particular, when it is assumed that the drawing capstan 2 is used, as shown in FIG. 3, the steel wire 3 in the drawing capstan 2 is placed on the auxiliary roll 7 arranged on the outlet side of the drawing capstan 2. It is advantageous to wind the steel wire 3 in the direction opposite to the winding direction of. That is, as described above, when the steel strand 3 is wound around the drawing capstan 2 to obtain a drawing force from the die, the residual torsion is also generated by winding the steel strand 3 around the drawing capstan 2. Therefore, by adding the step of winding in the direction opposite to the winding direction here with the auxiliary roll 7, it is possible to reduce the residual torsion caused by the winding with the drawing capstan 2. Therefore, it is preferable to use the auxiliary roll 7 having the same size as the drawing capstan 2.
[0028]
In addition, after the residual torsion reduction process using the auxiliary roll 7 described above, the residual roll torsion reduction process using the correction roll group 4 in FIG. 1 or the correction roll group 4 and the tilting roll 5 described above, and the twisting in FIG. 2 described above. It is also possible to further reduce the residual torsion by performing at least one of the residual torsion reduction processes by the apparatus 6.
[0029]
【Example】
A high carbon steel wire rod having a diameter of 5.5 mm containing 0.80 wt% carbon was dry-drawn until the diameter reached about 1.4 mm, and then subjected to a patenting treatment and a brass plating treatment. Next, wet multistage drawing was performed so that the wire was 0.25 mm. Furthermore, after the steel wire from the final wire drawing die was drawn and wound on a capstan, a residual torsion reduction treatment was performed under various conditions shown in Table 1. About the steel strand obtained in this way, the rotational property and the flatness in the treat material produced using each steel strand were evaluated. The evaluation results are also shown in Table 1.
[0030]
Here, the rotational property of the steel wire was evaluated by the residual torsion measured in accordance with the method described in 6.8 of JIS G3510 (1986). The direction of rotation is indicated as plus (+) for the clockwise direction and minus (-) for the opposite direction.
[0031]
In addition, the flatness of the treat material is such that a rubber sheet having a width of 30 cm and a length of 1 m is prepared by embedding steel strands in a rubber having a thickness of 1 mm at intervals of 50/50 mm, and the end of the rubber sheet is lifted. The height was measured, and the flatness was evaluated with the measured value.
[0032]
[Table 1]

[0033]
【Effect of the invention】
According to the present invention, the residual torsion inevitably remaining in the steel wire after wire drawing is advantageously reduced, so that it is applied as it is without being processed as a cord, particularly as a reinforcing material for rubber articles such as tires. It is possible to provide a very simple material that is suitable as a reinforcement of this kind.
[Brief description of the drawings]
FIG. 1 is a diagram showing a specific example of residual torsion reduction processing according to the present invention.
FIG. 2 is a diagram showing a specific example of residual torsion reduction processing according to the present invention.
FIG. 3 is a diagram showing a specific example of residual torsion reduction processing according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Final wire drawing die 2 Drawing capstan 3 Steel strand 4 Straightening roll group 5 Tilt roll 6 Twist device 7 Auxiliary roll

Claims (2)

In manufacturing steel strands by drawing steel wire rods, tilting rolls arranged on the exit side of the plurality of rolls on the steel wires after final drawing while passing through a plurality of rolls arranged in a staggered pattern A method of manufacturing a steel wire, characterized in that the residual torsion of the steel wire after the final wire drawing is rotated in the direction opposite to the direction around the wire axis and subjected to a residual torsion reduction treatment. When producing a steel wire by drawing a steel wire, the steel wire after the final drawing is wound around a drawn capstan and then passed through a plurality of rolls arranged in a staggered pattern after the final drawing. The steel wire is rotated in the direction opposite to the direction around the strand axis of the residual torsion of the steel wire after the final wire drawing by the tilting roll arranged on the outlet side of the plurality of rolls, and the residual torsion reduction processing is performed. A method for producing a steel wire , characterized by comprising :

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