JP4860051B2 - Manufacturing method of steel wire - Google Patents

Manufacturing method of steel wire Download PDF

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Publication number
JP4860051B2
JP4860051B2 JP2001135272A JP2001135272A JP4860051B2 JP 4860051 B2 JP4860051 B2 JP 4860051B2 JP 2001135272 A JP2001135272 A JP 2001135272A JP 2001135272 A JP2001135272 A JP 2001135272A JP 4860051 B2 JP4860051 B2 JP 4860051B2
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Prior art keywords
steel wire
wire
steel
residual torsion
final
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Japanese (ja)
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JP2002331327A (en
Inventor
明 原口
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Bridgestone Corp
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Bridgestone Corp
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Description

【0001】
【発明の属する技術分野】
この発明は、鋼素線の製造方法、特にゴム物品の補強材に適した鋼素線を製造する方法に関するものである。
【0002】
【従来の技術】
一般に、ワイヤロープ、ばねまたはタイヤ用コード等に供される鋼素線には、様々な特性が要求されている。例えば、近年の環境問題に対して、特に自動車の低燃費化を促進することが要求されている。そして、この低燃費化の促進には、タイヤの軽量化が急務であることから、タイヤの原材料の中でも比較的に重量のある、スチールコードの使用量またはその周りに使用するゴム材料の削減が要求されている。
【0003】
ここに、スチールコードの使用量や、その周囲のゴム材料を減らすためには、スチールコードの撚り構造を簡素化したり、コードの径を細くするなどの方策がとられている。例えば、スチールコードを簡素化する方策として、コードに使用する鋼素線をそのままタイヤの補強に供することが考えられる。
【0004】
【発明が解決しようとする課題】
しかしながら、鋼素線をそのままタイヤに適用しようとすると、該鋼素線の複数本を撚り合わせてコードとすることによって制御してきた、コードの各素線がもつ回転性、いわゆる残留トーションを適正に制御することが難しくなり、鋼素線自身の残留トーションがタイヤを製造する際のトリートの平坦性に影響を及ぼし、平坦なトリートが得られないことから、タイヤの製造そのものが難しくなるという欠点があった。
【0005】
そこで、この発明は、鋼線材を伸線加工して鋼素線を製造する際、該鋼素線の残留トーションを低減して、とりわけタイヤなどのゴム物品の補強材として、そのまま適用することが可能な鋼素線を製造するための方法について提案することを目的とする。
【0006】
【課題を解決するための手段】
この発明の要旨構成は、次のとおりである。
(1)鋼線材を伸線して鋼素線を製造するに当り、千鳥足状に配置した複数のロールを通過中の最終伸線後の鋼素線に、該複数のロールの出側に配置した傾動ロールにより最終伸線後の鋼素線がもつ残留トーションの素線軸回りの向きと逆方向に自転を与えて、残留トーション低減処理を施すことを特徴とする鋼素線の製造方法。
【0007】
(2)鋼線材を伸線して鋼素線を製造するに当り、最終伸線後の鋼素線を、引き抜きキャプスタンに巻き付けた後千鳥足状に配置した複数のロールに通過中の最終伸線後の鋼素線に、該複数のロールの出側に配置した傾動ロールにより最終伸線後の鋼素線がもつ残留トーションの素線軸回りの向きと逆方向に自転を与えて、残留トーション低減処理を施すことを特徴とする鋼素線の製造方法。
【0016】
【発明の実施の形態】
さて、鋼素線は、所定の成分組成に成る鋼線材に伸線加工を施すことによって得られる。この伸線加工は、種々の形式で行われるが、例えばタイヤ等のゴム物品の補強コード用の鋼素線の製造には、ダイスおよび引抜きキャプスタンの組み合わせを、潤滑液で満たされた槽内に、複数組積層配置し、各ダイスおよび引抜きキャプスタンに順に線材を通して連続的に伸線を行う、多段式の湿式伸線法が採用されている。
【0017】
かような伸線過程を経て得られた鋼素線は、個々のダイスにおける伸線加工時に、例えばダイス内面の偏磨耗に起因して減面加工が線材の周上で均一に行われないこと、或いはダイスからの引き抜きを引抜きキャプスタンに巻き付けて行うことから、残留トーションを有するのが一般的である。
【0018】
この残留トーションをもつ鋼素線は、その一端を固定して他端をフリーにした際に、素線の軸回りに特定の方向に自転するため、例えばタイヤのベルトに供するトリート材に鋼素線を適用した場合に、鋼素線が真直にならないことからトリート材の平坦性が阻害され、タイヤ製造時の障害となることは、既に述べたとおりである。従って、特に鋼素線をタイヤ等のゴム物品に適用する場合には、伸線後の鋼素線の残留トーションを低減することが極めて重要になり、この残留トーションの低減によって上記ゴム物品の補強材としての健全な適用が初めて可能になるのである。
【0019】
以下に、鋼素線における残留トーションの低減手法について、図面を参照してより具体的に説明する。
すなわち、図1に示すように、最終伸線ダイス1の出側に配置した引抜きキャプスタン2を介して、最終伸線ダイス1から鋼素線3を引き抜くことによって、鋼素線3は最終線径に調整される。
【0020】
この伸線加工を経た鋼素線3は、上記したように残留トーションを有するため、引抜きキャプスタン2の出側において鋼素線3を、さらに複数のロール4aを千鳥足状に配置した矯正ロール群4に通す工程を付与する。その際、矯正ロール群4の出側に配置した傾動ロール5を、鋼素線の引き出し側から見た、図1(b)に示すように、矯正ロール群4を通過した鋼素線3のパスラインPのいずれかの側に傾けた配置とし、この傾動ロール5に矯正ロール群4を通過した鋼素線3を導くことによって、矯正ロール群4を通過中の鋼素線3に自転を与える。この自転の向きは、最終伸線直後の鋼素線3がもつ残留トーションを、例えばJISG3510に則る残留トーションの測定方法に従って、予め測定しておき、その素線軸回りの向きと逆方向とし、それに従って上記傾動ロール5の傾斜向きを決定する。
【0021】
かくして矯正ロール群4を通過する鋼素線3には、まず千鳥足状に配置したロール群を通る際に異なる向きの曲げ加工が繰り返し付与されることによって、その残留応力の均一化に加えて、ロール間での軽圧下で素線が引き延ばされる結果、残留トーションの低減がはかられ、さらに残留トーションのもつ回転性と逆向きの自転が与えられることによって該残留トーションの更なる低減がはかられるのである。
【0022】
なお、矯正ロール群4を通過中の鋼素線3に自転を与えて、残留トーションの更なる低減をはかるには、矯正ロール群4を通過した鋼素線3を導く傾動ロール5の傾き方向並びに傾きの量を、伸線後の鋼素線における残留トーションに応じて適宜に調整することが有利である。
【0023】
なお、上記の残留トーション低減処理を経た鋼素線は、1本または複数本を束ねて、巻取りスプールに巻き取られ、保管、出荷または次工程へと供される。また、図1に示した事例では、最終伸線ダイスからの鋼素線3の引抜きを巻き付け形式の引抜きキャプスタン2で行っているが、例えば最終的に鋼素線を巻き取る巻取りドラムによる張力を利用してもよい。
【0024】
次に、上記した以外の残留トーション低減処理について、図2を参照して具体的に説明する。すなわち、最終伸線ダイス1の出側、または引抜きキャプスタン2を用いる場合はその出側に、並置して設けた2つのロール6aおよび6bをベース6cに回転自在に固定した捻回装置6を配置し、該装置6の2個のロール6aおよび6bに鋼素線3を8の字状に通してから、ベース6cを回転させることによって、鋼素線3に捻りを付与してからその捻りを戻す処理を連続して与える。この捻りとそれを戻す操作は、鋼素線3に強制的に導入した歪みを導入直後に除去することであるから、この一連の操作の過程で鋼素線の周方向の応力分布が均一化されるとともに、素線が引き延ばされる結果、残留トーションを低減することが可能になる。
【0025】
なお、上記の操作は、まず、伸線直後の鋼素線における残留トーションに応じた捻じり量を与えてから、同じ量を戻すことによって、残留トーションの低減を有利に達成できる。
【0026】
なお、上記捻回装置6による残留トーション低減処理を行ったのち、図1に示した矯正ロール群4又は、矯正ロール群4および傾動ロール5による残留トーション低減処理を施すことによって、さらなる残留トーションの低減をはかることも可能である。
【0027】
また、特に上記引抜きキャプスタン2の使用が前提である場合には、図3に示すように、引抜きキャプスタン2の出側に配置した補助ロール7に、引抜きキャプスタン2での鋼素線3の巻付け方向と反対回りに鋼素線3を巻付けることが有利である。すなわち、上述のように、引抜きキャプスタン2に鋼素線3を巻き付けてダイスからの引き抜き力を得る場合に、この引抜きキャプスタン2に鋼素線3を巻き付けることによっても残留トーションが発生する。従って、ここでの巻き付け方向と逆に巻回す工程を、補助ロール7にて付加することによって、引抜きキャプスタン2での巻き付けに起因する、残留トーションの低減をはかることができる。従って、補助ロール7は、引抜きキャプスタン2と同サイズのものを用いることが好ましい。
【0028】
なお、上記の補助ロール7を用いた残留トーション低減処理の後に、上記した図1の矯正ロール群4又は、矯正ロール群4および傾動ロール5による残留トーション低減処理、並びに上記した図2の捻回装置6による残留トーション低減処理のいずれか少なくとも一方の処理を施すことによって、さらなる残留トーションの低減をはかることも可能である。
【0029】
【実施例】
0.80wt%の炭素を含有する、直径が5.5mmの高炭素鋼線材を、直径が約1.4mmになるまで乾式伸線を施した後、パテンティング処理およびブラスめっき処理を施した。次いで、この線材を0.25mmになるように、湿式の多段伸線を行った。さらに、最終伸線ダイスを出た鋼素線を引抜きキャプスタンに巻付けた後、表1に示す諸条件にて残留トーション低減処理を施した。かくして得られた鋼素線について、その回転性と各鋼素線を用いて作製したトリート材における平坦性とを評価した。その評価結果を、表1に併記する。
【0030】
ここで、鋼素線の回転性は、JIS G3510(1986)の6.8に示された方法に準拠して測定した残留トーションをもって評価した。尚、回転方向は、時計方向に回転する方向をプラス(+)とし、その反対方向に回転するものをマイナス(−)として表示した。
【0031】
また、トリート材の平坦性は、鋼素線を50本/50mmの間隔で厚さ1mmのゴム中に埋設した、幅30cmおよび長さ1mのゴムシートを作成し、このゴムシート端部が浮き上がる高さを測定し、その測定値をもって平坦性を評価した。
【0032】
【表1】

Figure 0004860051
【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]
Figure 0004860051
[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)

鋼線材を伸線して鋼素線を製造するに当り、千鳥足状に配置した複数のロールを通過中の最終伸線後の鋼素線に、該複数のロールの出側に配置した傾動ロールにより最終伸線後の鋼素線がもつ残留トーションの素線軸回りの向きと逆方向に自転を与えて、残留トーション低減処理を施すことを特徴とする鋼素線の製造方法。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. 鋼線材を伸線して鋼素線を製造するに当り、最終伸線後の鋼素線を、引き抜きキャプスタンに巻き付けた後千鳥足状に配置した複数のロールに通過中の最終伸線後の鋼素線に、該複数のロールの出側に配置した傾動ロールにより最終伸線後の鋼素線がもつ残留トーションの素線軸回りの向きと逆方向に自転を与えて、残留トーション低減処理を施すことを特徴とする鋼素線の製造方法。 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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