JPH07279071A - Metal cord and composite material of the cord and rubber - Google Patents
Metal cord and composite material of the cord and rubberInfo
- Publication number
- JPH07279071A JPH07279071A JP6075940A JP7594094A JPH07279071A JP H07279071 A JPH07279071 A JP H07279071A JP 6075940 A JP6075940 A JP 6075940A JP 7594094 A JP7594094 A JP 7594094A JP H07279071 A JPH07279071 A JP H07279071A
- Authority
- JP
- Japan
- Prior art keywords
- metal
- cord
- core
- twisting
- rubber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
- D07B1/0626—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration the reinforcing cords consisting of three core wires or filaments and at least one layer of outer wires or filaments, i.e. a 3+N configuration
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2024—Strands twisted
- D07B2201/2029—Open winding
- D07B2201/2031—Different twist pitch
- D07B2201/2032—Different twist pitch compared with the core
Landscapes
- Tires In General (AREA)
- Reinforced Plastic Materials (AREA)
- Moulding By Coating Moulds (AREA)
- Ropes Or Cables (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は、耐斜め剪断強度特性
に優れたゴム物品補強用の金属コードと、これを補強材
としてゴム中に埋設して作られたタイヤ、コンベヤベル
ト、高圧ホース等の複合体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal cord for reinforcing a rubber article which is excellent in diagonal shear strength resistance, and a tire, a conveyor belt, a high pressure hose, etc. made by embedding the metal cord in a rubber as a reinforcing material. Regarding the complex of.
【0002】[0002]
【従来の技術】ゴム物品の補強に用いられる補強材料
は、通常、高炭素鋼線(JIS G 3502ピアノ線
材)を素材として、ゴムとの接着性を付与するために表
面にブラス(真鍮)、銅、亜鉛などの金属めっきを付
し、直径0.1〜0.5mmまで伸線加工したものを単
撚り、複撚り、または多層撚りしたものであり、タイ
ヤ、コンベヤベルト、高圧ホースなどの補強材として広
く用いられている。2. Description of the Related Art Reinforcing materials used to reinforce rubber articles are usually made of high carbon steel wire (JIS G 3502 piano wire) and have brass (brass) on the surface to provide adhesion with rubber. Metal, such as copper or zinc, is drawn and drawn to a diameter of 0.1 to 0.5 mm, and is single-stranded, double-stranded, or multi-layered, and is used to reinforce tires, conveyor belts, high-pressure hoses, etc. Widely used as a material.
【0003】例えば、トラック/バス用ラジアルタイヤ
のベルト部補強材として3+6の二層撚り構造の金属コ
ードが使用されている。For example, a metal cord having a 3 + 6 double-layer twist structure is used as a belt portion reinforcing material for radial tires for trucks / buses.
【0004】この種のゴム補強材に要求される品質特性
には、ゴムとの接着性、耐食性並びに他の種々の機械的
特性(斜め剪断強度、切断強度、剛性など)がある。Quality characteristics required for this kind of rubber reinforcing material include adhesiveness with rubber, corrosion resistance and various other mechanical characteristics (diagonal shear strength, cutting strength, rigidity, etc.).
【0005】これらのうち、耐食性に関しては、ゴム中
に埋設された補強材にゴム未被覆部が存在すると、タイ
ヤが走行中に石や釘などを踏んで切り傷を受け、その傷
が補強材まで達したとき、水分などの伝播が起こり腐食
が促進されて補強材の切断強度や耐食性が低下する。Among these, regarding the corrosion resistance, when a rubber-uncovered portion is present in the reinforcing material embedded in the rubber, the tire is stepped on stones, nails and the like while running, and the scratches reach the reinforcing material. When it reaches, the water propagates and the corrosion is promoted to lower the cutting strength and corrosion resistance of the reinforcing material.
【0006】また、補強材とゴムとの接着性が低下し、
剥離してタイヤのカットセパレーションなどの品質トラ
ブルを起こすおそれもある。Further, the adhesiveness between the reinforcing material and the rubber is lowered,
There is a risk of peeling and causing quality problems such as tire cut separation.
【0007】そこで、このような腐食伝播によるカット
セパレーションを防止するため、ゴムが金属コード内部
まで十分に浸透するコード構造が提案されている。例え
ば、特開昭63−235587号、特開平2−1540
86号及び特開平5−44184号公報にはコアを3本
から2本にして密閉空間をなくする一方、ストランドは
ゴム浸入を容易にするため、その本数を7〜8本にする
と共にストランドのフィラメントを100%を超える型
付率にすることが開示されている。Therefore, in order to prevent such cut separation due to corrosion propagation, a cord structure has been proposed in which rubber sufficiently penetrates into the metal cord. For example, JP-A-63-235587 and JP-A-2-1540.
No. 86 and Japanese Unexamined Patent Publication No. 5-44184 have three to two cores to eliminate a closed space, while the number of strands is set to 7 to 8 in order to facilitate rubber infiltration. It is disclosed that the filaments have a sizing rate of more than 100%.
【0008】また、特開平4−327278号公報には
コード切断強度を維持し、ゴム浸入を容易にするため1
×N(N≧6)の単撚り構造の金属コードが提案されて
いる。Further, in Japanese Patent Laid-Open No. 4-327278, in order to maintain cord cutting strength and facilitate rubber penetration,
A metal cord having a single twist structure of × N (N ≧ 6) has been proposed.
【0009】[0009]
【発明が解決しようとする課題】前記の従来例はいずれ
もコード内部へのゴム浸透を容易にし、腐食伝播を抑制
することによりコードの腐食による強度低下を抑制する
ことに主眼としている。All of the above-mentioned conventional examples are aimed at facilitating the permeation of rubber into the inside of the cord and suppressing the corrosion propagation to suppress the strength reduction due to the corrosion of the cord.
【0010】しかし、この種のコードはタイヤが鋭利な
角を持った石などを踏んだ際、局部的に斜め剪断応力を
受け、タイヤのトレッド面がカットを受けて破損する以
外に、補強材である金属コードそのものが斜め剪断応力
を受けて、金属コードを構成するフィラメントが破断す
る場合がある。However, this type of cord is subjected to a diagonal shear stress locally when the tire is stepped on a stone having sharp corners, and the tread surface of the tire is cut and damaged. In some cases, the metal cord itself is subjected to oblique shear stress, and the filaments forming the metal cord are broken.
【0011】そのことから、斜め剪断応力によるフィラ
メントの破断を防止する目的でタイヤトレッド直下に複
撚り構造で撚りピッチの小さい4×4または3×7構造
の高伸長コードを採用しているタイヤも見られる(特開
昭62−96104号公報)。Therefore, for the purpose of preventing the filaments from breaking due to diagonal shear stress, a tire using a high extension cord having a 4 × 4 or 3 × 7 structure having a double twist structure and a small twist pitch immediately below the tire tread is also used. Seen (JP-A-62-96104).
【0012】しかし、ゴム中へ埋設後も高伸長を維持す
ることは困難であり、現実には十分な効果を得るには至
っていない。そこでこの発明は、タイヤのベルト部の補
強材として常用されている3+6の二層構造コードに関
し、従来問題となっていた耐斜め剪断強度を改良した金
属コードと、この金属コードを補強材として耐久性を向
上させた、タイヤ、コンベヤベルト、高圧ホース等の複
合物を提供しようとするものである。However, it is difficult to maintain a high elongation even after being embedded in rubber, and in reality, a sufficient effect has not been obtained. Therefore, the present invention relates to a 3 + 6 two-layer structure cord that is commonly used as a reinforcing member for a belt portion of a tire, and a metal cord with improved diagonal shear strength, which has been a problem in the past, and a durable durability using this metal cord as a reinforcing member. An object of the present invention is to provide a composite material such as a tire, a conveyor belt, and a high pressure hose having improved properties.
【0013】[0013]
【課題を解決するための手段】上記の課題を解決するた
めに開発したこの発明は、表面に金属めっきを付した2
〜3本の金属フィラメントを撚り合わせて形成したコア
の円周に、表面に金属めっきを付した6〜8本の金属フ
ィラメントを撚りピッチ20mm以上で撚り合わせてな
る、二層構造の金属コードであり、従来のこの種の金属
コードより大幅に大きな撚りピッチで撚ると共に、コア
及び単一シースの各撚りピッチと撚り角が異なっている
ことを特徴とするもので、これらの金属フィラメントの
うち少なくとも単一シースに適用するものは、炭素含有
量の0.65〜0.78重量%の範囲にある鋼素線を使
用することが好ましい。また、コアと単一シースの撚り
方向が同方向であることが望ましく、コアの撚りピッチ
pcとシースの撚りピッチPとの関係がpc<Pであ
り、且つ、コアの撚り角αcとシースの撚り角αとの関
係がThe present invention, which was developed to solve the above-mentioned problems, has a metal plated surface.
~ A metal cord with a two-layer structure in which 6 to 8 metal filaments with metal plating on the surface are twisted with a twist pitch of 20 mm or more around the circumference of a core formed by twisting ~ 3 metal filaments Yes, it is characterized by twisting at a significantly larger twist pitch than conventional metal cords of this type, and the twist pitch and twist angle of the core and single sheath are different. For application to at least a single sheath, it is preferable to use a steel wire having a carbon content in the range of 0.65 to 0.78% by weight. Moreover, it is desirable that the twisting directions of the core and the single sheath are the same, the relationship between the twisting pitch pc of the core and the twisting pitch P of the sheath is pc <P, and the twisting angle αc of the core and the sheath twisting angle αc are the same. The relationship with the twist angle α
【0014】[0014]
【数2】 [Equation 2]
【0015】であるのが良い。It is preferable that
【0016】さらに、コアと単一シースに適応する金属
フィラメントの直径は0.15〜0.35mmの範囲が好
ましい。かかる金属コードを天然ゴムあるいは合成ゴム
を主体とするゴム中に補強材として埋設して作られる、
タイヤ、コンベヤベルト、高圧ホース等がこの発明のゴ
ム複合物であって、この複合物は、従来のそれに比べて
耐久性に優れる。Further, the diameter of the metal filament adapted to the core and the single sheath is preferably in the range of 0.15 to 0.35 mm. Made by embedding such a metal cord as a reinforcing material in rubber mainly composed of natural rubber or synthetic rubber,
Tires, conveyor belts, high-pressure hoses, and the like are the rubber composites of the present invention, and the composites have excellent durability as compared with the conventional ones.
【0017】なお、金属フィラメントの表面に付す金属
めっきは、ゴムとの接着性を良くするために、黄銅、
銅、亜鉛、或は黄銅にCo、Ni、Sn等の元素を添加
した三元合金等のめっきを被覆しておくのが望ましい。The metal plating applied to the surface of the metal filament is made of brass, in order to improve adhesion with rubber.
It is desirable to coat copper, zinc, or brass with a plating such as a ternary alloy in which an element such as Co, Ni, or Sn is added.
【0018】[0018]
【作用】金属コード又は金属フィラメント単体におい
て、その斜め剪断強度を向上させるためには、金属フィ
ラメント径を極力細くし、撚り加工時に捩りによる塑性
変形によって生じる強度低下を抑制することが考えられ
る。また同複合物すなわちタイヤ等に埋設された金属コ
ード又は金属フィラメントにおいては、極力高伸度を維
持でき、ゴムの加硫成形温度(140〜170℃)によ
る青熱脆性(又は時効硬化現象)の影響が少ないこと等
が重要である。In order to improve the diagonal shear strength of the metal cord or the metal filament alone, it is conceivable to make the diameter of the metal filament as small as possible and suppress the strength reduction caused by the plastic deformation due to the twist during the twisting process. Further, in the same composite, that is, in the metal cord or the metal filament embedded in the tire or the like, it is possible to maintain the elongation as high as possible, and to obtain the blue heat brittleness (or age hardening phenomenon) due to the vulcanization molding temperature (140 to 170 ° C.) of the rubber. It is important that the impact is small.
【0019】これらの点から斜め剪断強度を向上させる
ためのコードの撚り構造を考えると、従来の3+6コー
ド(二層構造)の撚りピッチ(20mm以下)より、大幅
に大きな撚りピッチの金属コードにすることにより、撚
り加工時の捩りによる塑性変形を減少させる構造がよ
く、しかも金属フィラメントを極力細径にすることが有
利であると考えられる。Considering the twist structure of the cord for improving the diagonal shear strength from these points, a metal cord having a twist pitch significantly larger than the twist pitch (20 mm or less) of the conventional 3 + 6 cord (two-layer structure) is used. By doing so, it is considered that the structure that reduces the plastic deformation due to the twist during the twisting process is good, and that it is advantageous to make the metal filament as thin as possible.
【0020】しかし、金属フィラメントを細径にするほ
どコードの強度維持の点から、その本数が多くなり、撚
線機の金属フィラメント供給装置の数が多くなることか
ら、設備の大型化を招きやすく、投資も過大化するおそ
れがある。However, the smaller the diameter of the metal filament, the larger the number of cords in order to maintain the strength of the cord, and the larger the number of metal filament supply devices of the twisting machine, which easily leads to the enlargement of the equipment. , There is a risk that investment will become excessive.
【0021】以上の観点から検討を重ねた結果、この発
明においては金属フィラメントを従来の3+6コードよ
り大きな撚りピッチとするのに加えて、撚りの安定化及
び両金属フィラメントの線接触面増による強度アップを
図るため、コア及び単一シースの撚り方向を同一とし、
撚りピッチと撚り角を適度に異ならしめると共に、金属
フィラメントも極力細径にする金属コードとした。As a result of repeated examinations from the above viewpoints, in the present invention, in addition to the metal filament having a twist pitch larger than that of the conventional 3 + 6 cord, the twisting is stabilized and the strength of the wire contact surface of both metal filaments is increased. In order to improve, the twisting directions of the core and single sheath are the same,
A metal cord was used in which the twist pitch and twist angle were appropriately made different, and the metal filament was made as thin as possible.
【0022】以下に、数値限定の理由を述べる。撚り合
わせて芯(コア)とする金属フィラメントについてその
数を2〜3本としたのは、2本が撚り合わせの最小本数
であり、最大本数は本数が増えることよるコア内部の空
洞部断面積が増加すると共に、タイヤトレッド部カット
からの水分による腐食伝播が早くなるので4本以上は考
えられず、最大3本とした。また、このコアを取りまく
金属フィラメントから構成される単一シースの本数につ
いてその数を6〜8本としたのは、6本未満であると強
度維持の点から従来3+6コードの金属フィラメントよ
り太くなるために、斜め剪断強度が低下するおそれがあ
り好ましくなく、最大本数はコア撚り本数と単一シース
間同士の隙間の適正化(0.025〜0.075mmが好
ましい)を含めて検討した結果、フィラメント径が同一
の場合の撚り構造設計面から算出される理論本数より1
本少ない8本とした。The reasons for limiting the numerical values will be described below. The number of metal filaments that are twisted together to form a core is set to 2 to 3 because the minimum number of twisted wires is 2 and the maximum number is the cross-sectional area of the cavity inside the core. As the number of tires increases, the corrosion propagation due to water from the tire tread cut becomes faster, so four or more are not considered, and the maximum was three. Further, the number of single sheaths composed of metal filaments surrounding this core is set to 6 to 8, and if the number is less than 6, it is thicker than the conventional 3 + 6 cord metal filaments from the viewpoint of maintaining strength. Therefore, there is a possibility that the diagonal shear strength may decrease, and the maximum number is the result of examination including the optimization of the number of core twists and the gap between single sheaths (preferably 0.025 to 0.075 mm), 1 from the theoretical number calculated from the design side of the twist structure when the filament diameter is the same
The number was reduced to eight.
【0023】また、コアを取りまく金属フィラメントか
ら構成される単一シースの撚りピッチを20mm以上とし
たのは、それ未満であると撚り加工時の捩りによる塑性
変形が従来の3+6コードと大して差の無いものにな
り、強度低下の抑制効果が得られないためである。The twisting pitch of the single sheath composed of the metal filaments surrounding the core is set to 20 mm or more. If the twisting pitch is less than 20 mm, the plastic deformation due to twisting during twisting is much different from the conventional 3 + 6 cord. It is because there is no such thing, and the effect of suppressing the decrease in strength cannot be obtained.
【0024】次に、双方の撚りピッチ及び撚り角の数値
限定について述べる。撚りピッチが同一であると両フィ
ラメントのコード長手方向での接触抵抗が少なく、コア
が抜け易くなるため双方の撚りピッチは異なるほうが望
ましい。従ってどちらかの撚りピッチを小さく(または
大きく)する必要があるが斜め剪断強度アップに関する
寄与率から考え、コアの撚りピッチの方を小さくするの
が効率的である。Next, numerical limitation of both twist pitches and twist angles will be described. If the twist pitch is the same, the contact resistance of both filaments in the longitudinal direction of the cord is small, and the core is easily pulled out. Therefore, it is necessary to reduce (or increase) one of the twist pitches, but it is effective to reduce the twist pitch of the core in consideration of the contribution rate for increasing the diagonal shear strength.
【0025】また、撚り角が同一であると、コア外接円
部と単一シースを構成する金属フィラメントとが接触す
る箇所とそうでない箇所が存在するためコード長手方向
でコード径変化が起こるので好ましくなく、一方、双方
の撚り角が大きく異なると両金属フィラメントの接触状
態が線から点へ移行するので強度維持の観点から好まし
くなく最適範囲として両者の撚り角の差は絶対値で3.
0°以下とした。一方、撚り合わせ金属フィラメントの
うち少なくともm本の炭素含有量を0.65〜0.78
重量%の範囲としたのは、0.65%未満では補強材と
しての強度維持のため金属フィラメントを太径にする必
要が生じるため、斜め剪断強度を低下させることにな
り、0.78重量%を越えるとゴムとの複合物におい
て、加硫成形時の温度による青熱脆性の影響が大きくな
り切断強度は大きくなるが斜め剪断強度は逆に低下させ
ることになるのでこの範囲が好ましい。Further, if the twist angles are the same, there is a portion where the circumscribing circle of the core and the metal filament forming the single sheath come into contact with each other, and a portion where the twist does not exist, so that the cord diameter changes in the cord longitudinal direction, which is preferable. On the other hand, if the twisting angles of the two are greatly different, the contact state of the two metal filaments shifts from a line to a point, which is not preferable from the viewpoint of maintaining strength, and the difference between the twisting angles of the two is an absolute value in the optimum range.
It was set to 0 ° or less. On the other hand, the carbon content of at least m of the twisted metal filaments is 0.65 to 0.78.
The range of wt% is less than 0.65%, since it is necessary to make the metal filament a large diameter in order to maintain the strength as a reinforcing material, the diagonal shear strength is reduced, and 0.78 wt% If it exceeds the range, in the compound with rubber, the influence of blue heat brittleness due to the temperature at the time of vulcanization molding becomes large and the cutting strength becomes large, but the diagonal shear strength decreases conversely, so this range is preferable.
【0026】なお、両金属フィラメントの直径は、先に
述べたように細径であるほど斜め剪断強度の低下が少な
いが、反面、コストアップを招き、また、要求切断強度
確保のため撚り本数増となり易い。As described above, the smaller the diameter of both metal filaments is, the smaller the decrease in diagonal shear strength is, but on the other hand, the cost is increased and the number of twists is increased to secure the required cutting strength. It is easy to become.
【0027】従って、細すぎるのも好ましくなく、金属
フィラメントの撚り本数と切断強度を考慮すると直径の
適正範囲は0.15〜0.35mm(より好ましくは、
0.20〜0.32mm)である。Therefore, it is not preferable that the diameter is too thin. Considering the number of twisted metal filaments and the cutting strength, the appropriate range of the diameter is 0.15 to 0.35 mm (more preferably,
0.20 to 0.32 mm).
【0028】[0028]
【実施例】表面にプラスめっきを施した直径0.20mm
の金属フィラメント1の3本をS方向に撚りピッチ26
mm(コード状態では13mmとなる)で撚り合わせて形成
したコアの周りに直径0.35mmの金属フィラメント2
の6本で構成した単一シースをコアと同方向に撚りピッ
チ26mmで撚り合わせて構成した図1(a)に示す横断
面構造の金属コードを得たが使用鋼素線の素材を炭素含
有率が0.65〜0.78重量%の範囲としたので実施
例1乃至3が得られた。[Example] Diameter 0.20 mm with positive plating on the surface
3 of the metal filaments 1 are twisted in the S direction with a pitch 26
A metal filament 2 with a diameter of 0.35 mm around a core formed by twisting together with a diameter of 13 mm (13 mm in the cord state)
We obtained a metal cord with a cross-sectional structure shown in Fig. 1 (a), which was constructed by twisting a single sheath composed of 6 pieces in the same direction as the core with a twist pitch of 26 mm. Examples 1 to 3 were obtained because the ratio was in the range of 0.65 to 0.78% by weight.
【0029】これらに対して撚り構造及び撚り方向は同
一にしてコア及び単一シースの撚りピッチだけを従来並
みの小ピッチにしたコードや、使用鋼素線の炭素含有率
だけを0.82重量%にしたコード、並びに撚り方向だ
けを逆方向にして撚り角の差が3.0°を超えるように
した金属コードも得た(比較例1乃至3)。On the other hand, the cord having the same twist structure and the same twist direction, in which only the twist pitch of the core and the single sheath has a small pitch similar to the conventional one, and the carbon content of the steel wire used is only 0.82 weight. %, And metal cords in which only the twisting direction was reversed and the difference in twist angle exceeded 3.0 ° were also obtained (Comparative Examples 1 to 3).
【0030】つぎに、炭素含有率が0.72重量%の鋼
素線にプラスめっきを施した金属フィラメントを使用し
て、撚り構造、撚り方向、撚りピッチ及び金属フィラメ
ントの直径を変えて切断荷重を略同水準にした図1
(b)及び図1(c)に示す横断面構造の金属コード
(実施例4、5、7、8及び比較例4乃至7)を作製し
た。Next, using a metal filament obtained by subjecting a steel wire having a carbon content of 0.72% by weight to a plus plating, the twisting structure, the twisting direction, the twisting pitch, and the diameter of the metal filament are changed to cut load. Figure 1 with the same level
Metal cords (Examples 4, 5, 7, 8 and Comparative Examples 4 to 7) having a cross-sectional structure shown in (b) and FIG. 1 (c) were produced.
【0031】また、上記3+6構造で撚り方向が同方向
で、撚りピッチをさらに大きくして撚り(捩り)減り率
を低減し切断荷重を向上させた金属コード(実施例
6)、さらには鋼素線の炭素含有率を変更した、撚り方
向が異なりピッチが小さい従来の3+6の二層撚り構造
の金属コード(従来例1乃至4)も作った。以上の各試
料について、切断荷重を測定して、これをベースとして
タイヤトレッド面の対カット性能の代用特性である斜め
剪断強度保持率を調べた。なお、斜め剪断強度測定に
は、図3に示す試験機を用いた。この試験機は、試料3
(金属コード)の両端を円柱状の固定ピン4で受けてチ
ャック6で掴み、その試料の中間部を、ハンドル7で位
置調整を行える移動ピン5で押し曲げ、その曲げ角θが
一定の条件下で一方のチャックを引き動かして切断時の
引張力を求める。Further, in the 3 + 6 structure, the twisting directions are the same, the twisting pitch is further increased to reduce the twisting (twisting) reduction rate and the cutting load is improved (Example 6), and further the steel material. Conventional 3 + 6 double-layer twisted metal cords (conventional examples 1 to 4) in which the carbon content of the wire was changed and the twist directions were different and the pitch was small were also made. With respect to each of the above samples, the cutting load was measured, and the diagonal shear strength retention rate, which is a substitute characteristic of the tire tread surface with respect to the cutting performance, was examined based on the measured cutting load. In addition, the test machine shown in FIG. 3 was used for the diagonal shear strength measurement. This tester uses sample 3
Both ends of the (metal cord) are received by the cylindrical fixing pin 4 and grasped by the chuck 6, and the intermediate portion of the sample is bent by the moving pin 5 whose position can be adjusted by the handle 7, and the bending angle θ is constant. Pull one of the chucks below to obtain the tensile force at the time of cutting.
【0032】ここで試験条件は、移動ピン5の先端R=
0.2mm、曲げ角θ=40°として行った。Here, the test condition is that the tip R of the moving pin 5 is R =
The test was conducted at 0.2 mm and a bending angle θ = 40 °.
【0033】結果を表1に示す。The results are shown in Table 1.
【0034】[0034]
【表1】 [Table 1]
【0035】[0035]
【効果】以上説明したように、この発明の金属コードは
金属フィラメントの撚り加工時の捩りによる塑性変形が
減じられているので斜め剪断強度の低下が少なく、ま
た、撚り方向を同方向として、しかも撚り角の差を小さ
くしているので金属フィラメント同士が線接触状態とな
り切断荷重を向上できる。As described above, in the metal cord of the present invention, since the plastic deformation due to the twist during the twisting of the metal filament is reduced, the diagonal shear strength is less decreased, and the twist directions are the same. Since the difference in the twist angle is small, the metal filaments are in line contact with each other and the cutting load can be improved.
【0036】したがって、これを補強材として作られる
タイヤ、コンベヤベルト、高圧ホース等のゴム複合物
は、その耐久性が向上する。Therefore, the durability of a rubber compound such as a tire, a conveyor belt, a high pressure hose, etc. made of this as a reinforcing material is improved.
【0037】また、撚りピッチが大きく、撚り合わせ回
数を少なくすることができるため、製造面でも生産性の
向上、コスト削減を図ることができる。Further, since the twist pitch is large and the number of twists can be reduced, productivity can be improved and cost can be reduced in terms of manufacturing.
【図1】実施例(a)、(b)、(c)の拡大横断面図FIG. 1 is an enlarged cross-sectional view of Examples (a), (b) and (c).
【図2】実施例の一部切欠側面図FIG. 2 is a partially cutaway side view of the embodiment.
【図3】斜め剪断強度の測定に用いた試験機の側面図FIG. 3 is a side view of a testing machine used for measuring diagonal shear strength.
1 コア用金属フィラメント 2 単一シース用金属フィラメント 3 試料 4 固定ピン 5 移動ピン 6 チャック 7 ハンドル P 単一シース用金属フィラメントの撚りピッチ pc コア用金属フィラメントの撚りピッチ α 単一シース用金属フィラメントの撚り角 αc コア用金属フィラメントの撚り角 θ 曲げ角 R 移動ピン先端の曲げ半径 1 Metal Filament for Core 2 Metal Filament for Single Sheath 3 Sample 4 Fixed Pin 5 Moving Pin 6 Chuck 7 Handle P Twist Pitch of Metal Filament for Single Sheath pc Twist Pitch of Metal Filament for Core α α of Metal Filament for Single Sheath Twisting angle αc Twisting angle of metal filament for core θ Bending angle R Bending radius of moving pin tip
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 B60C 9/00 L 7615−3D 9/18 7615−3D ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location B60C 9/00 L 7615-3D 9/18 7615-3D
Claims (6)
属フィラメントを撚り合わせて形成したコアと、このコ
アを取りまく表面に金属めっきを付した6〜8本の金属
フィラメントから構成される単一のシースとの二層構造
の金属コードにおいて、該単一シースの撚りピッチが2
0mm以上で、且つ、該コア及び該単一シースの各撚りピ
ッチと撚り角が異なっていることを特徴とする金属コー
ド。1. A core formed by twisting two or three metal filaments having metal plating on the surface and 6 to 8 metal filaments having metal plating on the surface surrounding the core. In a two-layer metal cord with a single sheath, the twist pitch of the single sheath is 2
A metal cord having a twist pitch and twist angle of 0 mm or more and the core and the single sheath being different.
も単一シースに適用するものは炭素含有量が、0.65
〜0.78重量%の範囲にある鋼線を使用する請求項1
記載の金属コード。2. The carbon filament of at least one of the metal filaments applied to a single sheath has a carbon content of 0.65.
Use of steel wire in the range of ~ 0.78% by weight.
The described metal cord.
ースの撚り方向が同方向であることを特徴とする請求項
1または2記載の金属コード。3. The metal cord according to claim 1, wherein the core and the single sheath are twisted in the same direction in the metal cord.
ッチpcと該シースの撚りピッチPとの関係がpc<P
であり、且つコアの撚り角αcと該シースの撚り角αと
の関係が 【数1】 であることを特徴とする請求項1乃至3の何れかに記載
の金属コード。4. In the metal cord, the relationship between the twist pitch pc of the core and the twist pitch P of the sheath is pc <P.
And the relationship between the twist angle αc of the core and the twist angle α of the sheath is The metal cord according to any one of claims 1 to 3, wherein
5〜0.35mmの範囲にある請求項1乃至4の何れかに
記載の金属コード。5. The diameter of both metal filaments is 0.1.
The metal cord according to any one of claims 1 to 4, which is in a range of 5 to 0.35 mm.
載の金属コードを天然ゴムあるいは合成ゴムを主体とす
るゴム中に補強材として埋設して作られたタイヤ、コン
ベアベルト、高圧ホース等のゴム複合物。6. A tire, a conveyor belt, a high pressure hose, etc. made by embedding the metal cord according to any one of claims 1 to 5 in a rubber mainly composed of natural rubber or synthetic rubber as a reinforcing material. Rubber compound.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6075940A JPH07279071A (en) | 1994-04-14 | 1994-04-14 | Metal cord and composite material of the cord and rubber |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6075940A JPH07279071A (en) | 1994-04-14 | 1994-04-14 | Metal cord and composite material of the cord and rubber |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH07279071A true JPH07279071A (en) | 1995-10-24 |
Family
ID=13590746
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6075940A Pending JPH07279071A (en) | 1994-04-14 | 1994-04-14 | Metal cord and composite material of the cord and rubber |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07279071A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114786961A (en) * | 2019-12-17 | 2022-07-22 | 倍耐力轮胎股份公司 | Metal reinforcing cord for tyres for vehicle wheels |
-
1994
- 1994-04-14 JP JP6075940A patent/JPH07279071A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114786961A (en) * | 2019-12-17 | 2022-07-22 | 倍耐力轮胎股份公司 | Metal reinforcing cord for tyres for vehicle wheels |
CN114786961B (en) * | 2019-12-17 | 2024-07-09 | 倍耐力轮胎股份公司 | Metal reinforcing cord for a tyre for vehicle wheels |
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