JP5551462B2 - Method for producing high carbon steel wire and high carbon steel wire obtained thereby - Google Patents
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本発明は高炭素鋼線の製造方法（以下、単に「鋼線」および「製造方法」とも称する）およびこれにより得られる高炭素鋼線に関し、詳しくは、タイヤ等のゴム物品の補強用途に用いられる高炭素鋼線の製造方法およびこれにより得られる高炭素鋼線に関する。 TECHNICAL FIELD The present invention relates to a method for producing a high carbon steel wire (hereinafter, also simply referred to as “steel wire” and “manufacturing method”) and a high carbon steel wire obtained thereby, and more specifically, used for reinforcing rubber articles such as tires. The present invention relates to a method for producing a high carbon steel wire and a high carbon steel wire obtained thereby.
近年、タイヤ軽量化のトレンドに伴って、その補強材として用いられるスチールコードのさらなる高強力化が期待されている。かかるスチールコードを構成する鋼線製造の最終段階である最終伸線工程においては、中間材料としての、パテンティング処理後にブラスめっきを施した硬鋼線を、湿式潤滑剤中で伸線している。この最終伸線工程における湿式伸線加工では、減面率を大きくして加工度を高くすることで、鋼線の高強力化を図っている。 In recent years, with the trend of weight reduction of tires, further enhancement of the strength of steel cords used as reinforcing materials is expected. In the final wire drawing process, which is the final stage of manufacturing the steel wire constituting the steel cord, a hard steel wire subjected to brass plating after the patenting treatment as an intermediate material is drawn in a wet lubricant. . In the wet wire drawing in this final wire drawing step, the steel wire is made highly strong by increasing the surface reduction ratio and increasing the workability.
鋼線の高強力化を図るための技術としては、例えば、特許文献１に、所定の炭素含有量を有する高炭素鋼線材に、前段伸線加工入側の鋼線材の直径と、前段伸線加工出側の中間線材の直径とにより定義される伸線加工量εが２．５以上となる前段伸線加工を施し、この前段伸線工程を経た中間線材に、引張強さを所定の範囲に調整するパテンティング処理を施したのち、最終伸線を含む後段伸線加工を施す高強力高炭素鋼線の製造方法が開示されている。 As a technique for increasing the strength of a steel wire, for example, in Patent Document 1, a high carbon steel wire having a predetermined carbon content, a diameter of a steel wire rod on the entry side of the former wire drawing process, and a former wire drawing Pre-drawn wire drawing with an amount ε of 2.5 or more, which is defined by the diameter of the intermediate wire on the machined side, is applied, and the tensile strength of the intermediate wire that has undergone the pre-drawing process is within a predetermined range. A method for producing a high-strength, high-carbon steel wire that is subjected to a subsequent drawing process including the final drawing after performing a patenting process to adjust to the above is disclosed.
しかしながら、最終伸線工程において減面率を高くして加工度を上げていくと、鋼線の高強力化は図れるものの、鋼線中の金属組織の配向の進行に伴って鋼線の脆化が生じやすいという問題があった。また、加工度を上げていって伸線途中で加工限界に達すると、デラミネーションによる鋼線の脆性断線が発生する場合もあった。さらに、伸線加工時の減面率を大きくするということは、最終伸線装置内に配置するダイの数が増えることを意味するため、減面率の増加に対しては、伸線装置側の制約もあった。 However, if the area reduction ratio is increased in the final wire drawing process to increase the workability, the strength of the steel wire can be increased, but the steel wire becomes brittle as the orientation of the metal structure in the steel wire progresses. There was a problem that was likely to occur. Moreover, when the working degree was increased and the working limit was reached in the middle of wire drawing, a brittle breakage of the steel wire due to delamination sometimes occurred. Furthermore, increasing the area reduction rate during wire drawing means increasing the number of dies placed in the final wire drawing device. There were also restrictions.
したがって、最終伸線工程における鋼線の加工限界をさらに向上して、延性を損なうことなく、鋼線のさらなる高強力化を図るための技術の確立が望まれていた。 Therefore, it has been desired to establish a technique for further improving the working limit of the steel wire in the final wire drawing process and further strengthening the steel wire without impairing the ductility.
そこで本発明の目的は、最終伸線工程を改良することにより、従来のパス数の制約等の問題を解消するとともに鋼線の加工限界をさらに向上して、延性を損なうことなくさらに高強力化を図った鋼線を得ることができる高炭素鋼線の製造方法およびこれにより得られる高炭素鋼線を提供することにある。 Therefore, the purpose of the present invention is to improve the final wire drawing process, thereby eliminating problems such as conventional restrictions on the number of passes and further improving the processing limit of the steel wire, further enhancing the strength without impairing the ductility. It is an object of the present invention to provide a method for producing a high carbon steel wire capable of obtaining a steel wire that achieves the above and a high carbon steel wire obtained thereby.
本発明者らは鋭意検討した結果、最終伸線加工を複数の伸線工程に分けて行い、所定の伸線方向で伸線工程を行った後、伸線方向を逆方向に変えて次の伸線工程を行うものとすることで、鋼線の強度を維持しつつ延性を向上させることが可能となることを見出し、この技術を高炭素鋼線の製造工程に適用したところ、高強度でかつ延性に優れた高炭素鋼線が得られることを見出して、本発明を完成するに至った。 As a result of intensive studies, the inventors have performed the final wire drawing process in a plurality of wire drawing steps, and after performing the wire drawing step in a predetermined wire drawing direction, the wire drawing direction is changed to the opposite direction to It was found that by performing the wire drawing process, it was possible to improve the ductility while maintaining the strength of the steel wire, and when this technology was applied to the manufacturing process of high carbon steel wire, The inventors have found that a high carbon steel wire excellent in ductility can be obtained, and have completed the present invention.
すなわち、本発明の高炭素鋼線の製造方法は、パテンティング処理後にブラスめっきを施した高炭素鋼線材を、最終伸線工程で湿式伸線することにより高炭素鋼線を得る高炭素鋼線の製造方法において、
前記湿式伸線を複数回に分けて行うにあたり、前記高炭素鋼線材に対し冷間の湿式伸線を施した後、伸線された該高炭素鋼線材を一旦巻取り、再度繰出して、加工方向を逆方向にした状態で、該高炭素鋼線材に対し再度、冷間の湿式伸線を施す製造方法であって、該加工方向の変更を、少なくとも前記最終伸線工程における累積伸線加工歪εｎが２．５〜３となった段階で行うことを特徴とするものである。
That is, the method for producing a high carbon steel wire of the present invention is a high carbon steel wire that obtains a high carbon steel wire by wet-drawing a high carbon steel wire that has been subjected to brass plating after patenting treatment in a final wire drawing step. In the manufacturing method of
In performing the wet wire drawing in a plurality of times, after performing cold wet wire drawing on the high carbon steel wire material, the drawn high carbon steel wire material is once taken up and redrawn for processing. A manufacturing method in which cold wet wire drawing is performed again on the high carbon steel wire rod in a state where the direction is reversed, and the change in the working direction is performed at least in the final wire drawing step. This is performed at a stage where the strain ε n becomes 2.5 to 3.
本発明においては、前記複数回の湿式伸線を行う間に、前記加工方向の変更を２回以上行うことができる。また、本発明においては、前記加工方向の変更を、目的とする最終線径に至る最後の３パス以内で行うことが好ましい。 In the present invention, the machining direction can be changed twice or more during the plurality of wet wire drawing. In the present invention, the machining direction is preferably changed within the last three passes up to the final final wire diameter.
また、本発明の高炭素鋼線は、上記本発明の高炭素鋼線の製造方法により得られたことを特徴とするものである。 The high carbon steel wire of the present invention is obtained by the above-described method for producing a high carbon steel wire of the present invention.
本発明によれば、従来の伸線装置におけるパス数の制約等の問題の解消を図ることができるとともに、最終伸線工程における鋼線の加工限界をさらに向上することができ、従来よりもさらに高強度で延性に優れた高炭素鋼線を得ることが可能である。 According to the present invention, it is possible to solve problems such as restrictions on the number of passes in the conventional wire drawing apparatus, and further improve the processing limit of the steel wire in the final wire drawing process, which is further than before. It is possible to obtain a high carbon steel wire having high strength and excellent ductility.
以下、本発明の実施の形態について、図面を参照しつつ詳細に説明する。
本発明は、パテンティング処理後にブラスめっきを施した高炭素鋼線材、例えば、炭素含有量が０．６〜１．２質量％の高炭素鋼線材を、最終伸線工程で湿式伸線することにより高炭素鋼線を得る技術の改良に係るものである。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
This invention wet-draws the high carbon steel wire which carried out the brass plating after the patenting process, for example, the high carbon steel wire whose carbon content is 0.6-1.2 mass% in the final wire drawing process. This relates to an improvement in the technology for obtaining a high carbon steel wire.
図１に、本発明の高炭素鋼線の製造方法に係る説明図である。本発明においては、最終伸線工程における湿式伸線を複数回に分けて行うものとし、（ａ）に示すように、高炭素鋼線材１をロール１１から繰出して、この高炭素鋼線材１に対し冷間の湿式伸線を施した後、伸線された高炭素鋼線材１Ａをロール１２で一旦巻き取る。次いで、（ｂ）に示すように、この巻き取られた高炭素鋼線材１Ａをロール１２から再度繰出して、この高炭素鋼線材１Ａに対し再度、冷間の湿式伸線を施し、ロール１３にて巻き取るものである。このようにすることで、前段の湿式伸線における鋼線材の巻取り端が後段の湿式伸線における鋼線材の繰出し端となるので、後段の湿式伸線においては、鋼線材の加工方向（伸線方向）が逆方向になった状態で、伸線加工を行うことが可能となる。すなわち、鋼線の製造過程の最終段階である最終伸線工程において、従来は、同じ加工方向ですべての伸線パスを行っていたのに対し、本発明においては、異なる加工方向、つまり、逆方向の伸線パスを設けるものである。なお、図中の符号１Ｂは、後段の湿式伸線後の鋼線材または鋼線を示し、符号１４，１５は潤滑剤槽、符号１６，１７は伸線機を示す。
In FIG. 1, it is explanatory drawing which concerns on the manufacturing method of the high carbon steel wire of this invention. In the present invention, the wet wire drawing in the final wire drawing step is performed in a plurality of times, and as shown in (a), the high carbon steel wire 1 is fed out from the
このように、加工方向を逆方向としたパスを設けることで、鋼線の加工限界をさらに向上して、高強度で延性に優れた高炭素鋼線が得られる理由としては、以下のように考えられる。 As described above, by providing a path whose processing direction is reversed, the processing limit of the steel wire can be further improved, and a high carbon steel wire having high strength and excellent ductility can be obtained as follows. Conceivable.
すなわち、最終伸線工程においては、鋼線は、数十個のダイにより細く引き伸ばされる。これらの伸線加工により、体心立方からなる鉄の結晶にすべりが導入されて、伸線方向と平行に１１０繊維軸をもつ集合組織が形成される。このため、鋼線の配向が進むに従って、加工によるすべり面が限定され、同時に炭素等の侵入型元素によりすべり面内の転移固着が生ずることで、加工限界へと至ることになる。本発明においては、伸線加工における引抜き方向を加工途中で逆転させることで、前段の加工で用いたすべり面以外のすべり系へ加工を導入して、同時に前段の加工での転移固着により加工の難しくなったすべり系の固着を外すことで、加工限界を向上させ、従来よりもさらに高強度の高炭素鋼線を得ることが可能となったものである。 That is, in the final wire drawing step, the steel wire is thinly drawn by several tens of dies. By these wire drawing processes, slip is introduced into iron crystals composed of body-centered cubes, and a texture having 110 fiber axes is formed in parallel to the wire drawing direction. For this reason, as the orientation of the steel wire progresses, the slip surface due to the processing is limited, and at the same time, transitional fixation in the slip surface is caused by an interstitial element such as carbon, which leads to the processing limit. In the present invention, the drawing direction in the wire drawing process is reversed in the middle of the process to introduce the process into the slip system other than the slip surface used in the previous process, and at the same time, the process is fixed by the transfer fixation in the previous process. By removing the sticking of the slip system that became difficult, it became possible to improve the working limit and to obtain a high-carbon steel wire with higher strength than before.
一方で、高強度鋼線に撚線を行いスチールコードとするためには、撚線での曲げ加工に耐えるための延性が必要となる。前述したように、一方向の伸線を続けた高強度鋼線においては延性が不足することとなるが、本発明においては、理由は明らかではないものの、上述したように加工方向を逆方向としたパスを設けて伸線を行うことで、その後の撚線加工にも耐え得る延性を付与することができ、高強度と良好な延性とを両立させることが可能となった。また、本発明においては、鋼線の加工度を上げた際におけるデラミネーションによる脆性断線の発生についても回避することが可能である。 On the other hand, in order to twist a high-strength steel wire into a steel cord, ductility is required to withstand bending with the twisted wire. As described above, in a high-strength steel wire that has been drawn in one direction, ductility will be insufficient, but in the present invention, although the reason is not clear, as described above, the processing direction is set to the reverse direction. By performing the wire drawing by providing the pass, it was possible to impart ductility that can withstand subsequent stranded wire processing, and to achieve both high strength and good ductility. In the present invention, it is also possible to avoid the occurrence of brittle disconnection due to delamination when the workability of the steel wire is increased.
本発明においては、最終伸線工程において、少なくとも一回、加工方向を逆方向として伸線加工を実施することが重要であり、これにより、上記加工限界の向上等の所期の効果を得ることが可能である。 In the present invention, in the final wire drawing step, it is important to carry out wire drawing at least once with the processing direction as the reverse direction, thereby obtaining the desired effects such as improvement of the processing limit. Is possible.
また、加工方向の変更は一回に限られるものではなく、複数回の湿式伸線を行う間に、加工方向の変更を２回以上、例えば、２〜４回程度行ってもよい。加工方向の変更は、加工途中の鋼線材の巻き取り、再度繰出しの作業を要するため、多すぎても歩留まり性の大幅な悪化を招くため好ましくなく、また、それ以上の効果を得られるものでもない。 Further, the change in the processing direction is not limited to one time, and the change in the processing direction may be performed two or more times, for example, about 2 to 4 times while performing wet drawing a plurality of times. Changing the processing direction requires winding the steel wire in the middle of processing, and re-feeding work, so even if it is too much, it is not preferable because it causes a significant deterioration in yield, and even more effects can be obtained. Absent.
特には、加工方向の変更を、目的とする最終線径に至る最後の３パス以内で行って、その後の伸線により最終線径を得るものとすることが好ましい。これは、加工方向を変えた初めの数パスを経た鋼線材の延性の回復が顕著であるためである。ここで、この最後の３パスとは、最終線径を得るための最後のダイスにおける伸線加工を最終パスとして、その上流側の、最終パスの１つ手前のダイスにおける伸線加工、および、２つ手前のダイスにおける伸線加工までを含む計３パスを意味する。また、本発明においては、例えば、下記式で定義される最終伸線工程における累積伸線加工歪εｎが２．５〜３程度となった段階で加工方向の変更を実施することが好適である。
εｎ＝２ｌｎ（ｄ０／ｄｎ）
（式中、ｄ０は伸線機入側のワイヤ径（ｍｍ）であり、ｄｎはｎ段目の伸線パス出側のワイヤ径（ｍｍ）である）
In particular, it is preferable that the machining direction is changed within the last three passes to reach the final final wire diameter, and the final wire diameter is obtained by subsequent drawing. This is because the recovery of the ductility of the steel wire material after the first few passes when the processing direction is changed is remarkable. Here, the last three passes are the wire drawing in the last die for obtaining the final wire diameter as the final pass, the wire drawing in the die immediately before the final pass on the upstream side, and This means a total of 3 passes including the wire drawing in the two previous dies. In the present invention, for example, it is preferable to change the machining direction when the cumulative wire drawing strain ε n in the final wire drawing step defined by the following formula becomes about 2.5 to 3. is there.
ε n = 2ln (d 0 / d n )
(Where d 0 is the wire diameter (mm) on the wire drawing machine entry side, and dn is the wire diameter (mm) on the wire draw path exit side of the n- th stage)
本発明によれば、引張強度で３５００ＭＰａ〜４５００ＭＰａ程度の高強度の高炭素鋼線を得ることができる。 According to the present invention, a high strength high carbon steel wire having a tensile strength of about 3500 MPa to 4500 MPa can be obtained.
以下、本発明を、実施例を用いてより詳細に説明する。
＜従来例＞
パテンティング処理後にブラスめっきを施した線径１．８６ｍｍの高炭素鋼線材（炭素含有量０．８２質量％）を、最終伸線工程で同一方向に湿式伸線することにより、線径０．２２ｍｍの高炭素鋼線を得た。
Hereinafter, the present invention will be described in more detail with reference to examples.
<Conventional example>
A high carbon steel wire rod having a wire diameter of 1.86 mm (carbon content of 0.82% by mass) subjected to brass plating after the patenting treatment is wet-drawn in the same direction in the final wire drawing step, thereby obtaining a wire diameter of 0. A 22 mm high carbon steel wire was obtained.
＜実施例１＞
高炭素鋼線材を、線径０．５ｍｍとなるまで湿式伸線した後（累積伸線加工歪εｎ：２．６）、この鋼線材を一旦巻取り、再度繰出して、加工方向を逆方向にした状態で、残りの湿式伸線を行った以外は従来例と同様にして、高炭素鋼線を得た。
<Example 1>
After wet-drawing a high carbon steel wire to a wire diameter of 0.5 mm (cumulative wire drawing strain ε n : 2.6), the steel wire is once wound up and fed out again to reverse the working direction. In this state, a high carbon steel wire was obtained in the same manner as in the conventional example except that the remaining wet drawing was performed.
＜実施例２＞
高炭素鋼線材を、線径０．５ｍｍとなるまで湿式伸線した後（累積伸線加工歪εｎ：２．６）、この鋼線材を一旦巻取り、再度繰出して、加工方向を逆方向にした状態で、さらに、目的とする最終線径に至る最後の３パスの手前まで湿式伸線した（線径０．２３ｍｍ，累積伸線加工歪εｎ：４．２）。その後、この鋼線材をふたたび巻取り、繰出して、加工方向を再度逆方向にして、残りの湿式伸線を行った以外は従来例と同様にして、高炭素鋼線を得た。
<Example 2>
After wet-drawing a high carbon steel wire to a wire diameter of 0.5 mm (cumulative wire drawing strain ε n : 2.6), the steel wire is once wound up and fed out again to reverse the working direction. In this state, the wet wire was further drawn before the last three passes to reach the final final wire diameter (wire diameter 0.23 mm, cumulative wire drawing strain ε n : 4.2). Thereafter, the steel wire was again wound up and fed out, the working direction was again reversed, and the remaining wet wire drawing was performed to obtain a high carbon steel wire in the same manner as in the conventional example.
＜参考例＞
高炭素鋼線材を、目的とする最終線径に至る最後の３パスの手前まで湿式伸線した後（線径０．２３ｍｍ，累積伸線加工歪εｎ：４．２）、この鋼線材を一旦巻取り、再度繰出して、加工方向を逆方向にした状態で、残りの３パスの湿式伸線を行った以外は従来例と同様にして、高炭素鋼線を得た。
<Reference example>
After wet-drawing a high carbon steel wire until the last three passes to the final wire diameter (wire diameter 0.23 mm, cumulative wire drawing strain ε n : 4.2), this steel wire A high carbon steel wire was obtained in the same manner as in the conventional example, except that the remaining three passes of wet wire drawing were performed in a state where the wire was once wound up and redrawn and the processing direction was reversed.
従来例、実施例および参考例について、得られた各鋼線の引張強度、延性、断面内におけるビッカース硬度分布、および、接着性について評価した結果を、下記の表中および図２（参考例）、図３（従来例）中に示す。 The results of evaluating the tensile strength, ductility, Vickers hardness distribution in the cross section, and adhesiveness of each steel wire obtained for the conventional examples, examples and reference examples are shown in the following table and FIG. 2 (reference example). This is shown in FIG. 3 (conventional example).
＜鋼線の引張強度評価＞
従来例、実施例および参考例において得られた各鋼線の引張強度を、ＪＩＳ Ｚ ２２４１に規定された引張試験に準拠して測定した。
<Evaluation of tensile strength of steel wire>
The tensile strength of each steel wire obtained in the conventional example, the example and the reference example was measured in accordance with a tensile test defined in JIS Z 2241.
＜鋼線の延性評価＞
従来例、実施例および参考例において得られた各鋼線の延性を、鋼線の長さ１００ｄ（ｄ：鋼線の直径）あたりの破断までの捻り回転数（破断までの捻り回転数／１００ｄ）により評価した。結果は、従来例を３とした指数にて示す。数値が大なるほど、延性に優れているといえる。
<Evaluation of ductility of steel wire>
The ductility of each steel wire obtained in the conventional example, the example and the reference example is expressed by the number of twist rotations until breakage per length of steel wire 100d (d: diameter of the steel wire) (twisting rotation number until breakage / 100d ). A result is shown by the index | exponent which made the conventional example 3. It can be said that the larger the value, the better the ductility.
＜ビッカース硬度の評価＞
従来例、実施例および参考例において得られた各鋼線のビッカース硬度の評価試験は、ＪＩＳ Ｚ ２２４４に準じて実施した。評価試料は、各鋼線を立てた状態で埋込樹脂内に埋め込み、その後、埋め込んだ鋼線につき、ＳｉＣ、ダイヤモンドペーストおよびアルミナ粉末を用いて断面を鏡面研磨することにより作製した。得られた試料につき、鋼線の断面の中心から表層にかけて、前記試験規格に準じた間隔をあけて、ビッカース硬度試験を実施した。
<Evaluation of Vickers hardness>
The evaluation test of Vickers hardness of each steel wire obtained in the conventional example, the example and the reference example was carried out according to JIS Z 2244. The evaluation sample was prepared by embedding each steel wire in an embedded resin in an upright state, and then mirror polishing the cross section of the embedded steel wire using SiC, diamond paste and alumina powder. About the obtained sample, the interval according to the said test specification was opened from the center of the cross section of the steel wire to the surface layer, and the Vickers hardness test was implemented.
＜鋼線の接着性評価＞
従来例、実施例および参考例において得られた各鋼線を未加硫ゴムで被覆し、これを１６０℃×１５分間の条件で加硫して得られたゴム−鋼線複合体につき、ゴムから鋼線を剥離して、その時のゴム付着率を測定した。結果は、目視評価にて、鋼線表面のゴム被覆率が９０％以上である場合を○、９０％未満である場合を×として示した。
<Evaluation of steel wire adhesion>
For each rubber-steel wire composite obtained by coating each steel wire obtained in the conventional examples, examples and reference examples with unvulcanized rubber and vulcanizing it at 160 ° C. for 15 minutes, rubber The steel wire was peeled off and the rubber adhesion rate at that time was measured. As a result of visual evaluation, the case where the rubber coverage on the surface of the steel wire was 90% or more was shown as ◯, and the case where it was less than 90% was shown as x.
上記表中および図２，３に示すように、本発明に係る実施例および参考例により得られた鋼線においては、加工方向の変更により延性の低下が抑制されているとともに、従来例と比較して高い強度、および、従来例と同等の接着性が得られていることが確かめられた。また、参考例においては、鋼線の硬度分布についても、従来例と比較して均一化されていた。 As shown in the above table and FIGS. 2 and 3, in the steel wires obtained by the examples and reference examples according to the present invention, the reduction in ductility is suppressed by changing the working direction, and compared with the conventional examples. As a result, it was confirmed that high strength and adhesiveness equivalent to the conventional example were obtained. In the reference example, the hardness distribution of the steel wire was also made uniform compared to the conventional example.
１，１Ａ 高炭素鋼線材
１Ｂ 高炭素鋼線材または高炭素鋼線
１１〜１３ ロール
１４，１５ 潤滑剤槽
１６，１７ 伸線機
1,1A High
Claims (4)
前記湿式伸線を複数回に分けて行うにあたり、前記高炭素鋼線材に対し冷間の湿式伸線を施した後、伸線された該高炭素鋼線材を一旦巻取り、再度繰出して、加工方向を逆方向にした状態で、該高炭素鋼線材に対し再度、冷間の湿式伸線を施す製造方法であって、該加工方向の変更を、少なくとも前記最終伸線工程における累積伸線加工歪ε ｎ が２．５〜３となった段階で行うことを特徴とする高炭素鋼線の製造方法。 In the high carbon steel wire manufacturing method of obtaining a high carbon steel wire by wet-drawing the high carbon steel wire rod subjected to brass plating after the patenting treatment in the final wire drawing step,
The wet-drawing the a plurality of times rows Uniatari, was subjected to wet-drawing of cold over the previous SL high carbon steel wire rod, once the winding wire drawing has been the high carbon steel wire rod, out Repetitive again A manufacturing method in which cold wet wire drawing is performed again on the high carbon steel wire rod in a state in which the working direction is reversed , and the change in the working direction is performed at least in the cumulative wire drawing in the final wire drawing step. A method for producing a high carbon steel wire, which is performed at a stage where the wire processing strain ε n becomes 2.5 to 3 .
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| CN106734325A (en) * | 2017-02-16 | 2017-05-31 | 江苏龙威电力设备有限公司 | A kind of electromagnetic wire of transformer wire drawing machine |
| CN109092918B (en) * | 2018-07-19 | 2020-04-10 | 安吉热威电热科技有限公司 | Resistance wire drawing die matching structure and process method |
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| CN112453080B (en) * | 2020-11-05 | 2022-05-17 | 德清林缘金属制品有限公司 | Manufacturing method of steel wire with excellent stability and stress resistance for spring |
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