WO2020113606A1 - Steel cord and manufacturing method therefor, and tire provided with steel cord - Google Patents

Steel cord and manufacturing method therefor, and tire provided with steel cord Download PDF

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Publication number
WO2020113606A1
WO2020113606A1 PCT/CN2018/120154 CN2018120154W WO2020113606A1 WO 2020113606 A1 WO2020113606 A1 WO 2020113606A1 CN 2018120154 W CN2018120154 W CN 2018120154W WO 2020113606 A1 WO2020113606 A1 WO 2020113606A1
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Prior art keywords
hardness
monofilament
cross
steel cord
steel
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PCT/CN2018/120154
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French (fr)
Chinese (zh)
Inventor
刘祥
姚海东
冯国兵
王益平
王锏
刘亚兰
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江苏兴达钢帘线股份有限公司
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Publication of WO2020113606A1 publication Critical patent/WO2020113606A1/en

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
    • B21C37/045—Manufacture of wire or bars with particular section or properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
    • B21C37/047—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire of fine wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/02—Carcasses
    • B60C9/16—Carcasses built-up with metallic reinforcing inlays
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3021—Metals
    • D07B2205/3025—Steel
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/2055—Improving load capacity
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2046—Tire cords

Definitions

  • the invention relates to the technical field of design and production of steel cords for radial tires, in particular to a steel cord and a method for manufacturing the same, and a tire having the steel cord.
  • Steel cord is the main skeleton material of radial tires for vehicles, and its quality directly affects the service life of tires.
  • the steel cord is the main stress component of the radial tire, which largely determines the strength of the tire and the profile after inflation.
  • the steel cord only has sufficient strength and rigidity, the tire's carrying capacity, safety performance, and driving comfort Sex can be guaranteed.
  • the tensile strength of high-strength steel cords (UT cords, ultratensile cords) reaches 4400-2000 ⁇ DMPa, where D is the diameter of the monofilament; higher strength MT cords (megatensiles) are also proposed in the industry strength), its monofilament tensile strength reaches 4700-2000 ⁇ D MPa.
  • the monofilament cross-section core has a small degree of shear deformation and a large side shear deformation during the twisting or twisting process, so the monofilament cross-section core hardness is low and the edge hardness The high state is not conducive to twisting or twisting.
  • US588321 proposes a two-die drawing process, which changes the hardness distribution of the cross-section of the monofilament through surface drawing deformation; in addition, "Ultra High Tensile Strength” Steel "Cord” published by Nippon Steel Technical report proposes to change the friction coefficient and Bending way to improve the cross-section hardness distribution of the monofilament.
  • the above method still has the phenomenon that the hardness of the monofilament core is low and the hardness of the monofilament edge is high, which is not conducive to production.
  • the purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a steel cord and a method for manufacturing the same.
  • the steel cord monofilament does not exhibit delamination during the torsion test. During the production process, the monofilament is twisted as The steel cord has less broken wires, which is beneficial to the mass production of the steel cord.
  • a steel cord of the present invention is made by twisting a monofilament.
  • the cross-section hardness of the monofilament is regularly distributed in a “ ⁇ ” type.
  • the monofilament cross-section hardness is the highest in the core, along the diameter
  • the cross-sectional hardness of the edge of the monofilament gradually decreases, and the difference between the hardness of the core of the monofilament and the hardness of the edge is between 10Hv and 100Hv.
  • the carbon content of the monofilament is not less than 0.60%.
  • the diameter of the monofilament is 0.10 mm to 0.80 mm.
  • the present invention also discloses a method for manufacturing the above steel cord, including:
  • step S3 Perform intermediate frequency tempering treatment on the steel wire processed in step S2, so that the cross-sectional hardness of the steel wire is regularly distributed in a " ⁇ " type, the core hardness of the cross-section of the steel wire is high, and the hardness of the edge is low;
  • step S4 Drawing the steel wire processed in step S3 into a monofilament D2, so that the cross-section hardness of the monofilament is regularly distributed in a " ⁇ " type, the monofilament has a high cross-section core hardness and a low edge hardness, and the monofilament cross-section core part
  • the difference between hardness and edge hardness is between 10Hv ⁇ 100Hv;
  • the power of the intermediate frequency tempering is between 10KW and 25KW, and the intermediate frequency tempering time is 0.2 to 5 seconds.
  • the true strain of the wire when D0 is drawn to D1 accounts for 50% to 95% of the true strain of the wire when D0 is drawn to D2.
  • the present invention also discloses a tire including the steel cord described above.
  • the manufactured high-strength monofilaments do not exhibit delamination during torsion testing.
  • the monofilaments are twisted into steel cords with few broken wires, which is suitable for special features. Mass production of high-strength and above-strength steel cord monofilaments and steel cords meets the demand for lightweight development of tires.
  • FIG. 1 is a schematic diagram showing the test position of the hardness of the steel cord monofilament section of the present invention
  • FIG. 2 is a schematic diagram showing the distribution of the cross-section hardness curve of the steel cord monofilament of the present invention.
  • a steel cord according to an embodiment of the present invention includes the following steps:
  • step S2 The steel wire processed in step S1 is drawn to the diameter D1 in multiple passes in the water tank drawing machine, or is drawn to the diameter D1 in multiple passes in the dry wire drawing machine;
  • step S3 Perform intermediate frequency tempering on the steel wire processed in step S2.
  • the power of intermediate frequency tempering is between 10KW and 25KW, and the intermediate frequency tempering time is 0.2 to 5 seconds;
  • the intermediate frequency induction heating steel wire is used, because the intermediate frequency induction heating steel wire has a skin effect, which can make the cross-sectional hardness of the steel wire with a diameter D1 of " ⁇ " type regular distribution, the cross-sectional hardness of the steel wire is high, and the hardness of the edge is low .
  • the power and tempering time of the intermediate frequency tempering are very important for the treatment effect of the steel wire. If the power and voltage are too low, or the intermediate frequency tempering time is too short, the cross-section hardness distribution of the steel wire cannot obtain the required state; the power and tempering of the intermediate frequency tempering If the voltage is too high, or the intermediate frequency tempering time is too long, the steel wire structure will be carbonized and not conducive to subsequent processing.
  • step S3 The steel wire processed in step S3 is drawn into a monofilament with a diameter of D2 in a water tank drawing machine through multiple passes;
  • step S2 the true strain of the steel wire when drawing from the diameter D0 to D1 accounts for 50% to 95% of the true strain of the steel wire when drawing from the diameter D0 to D2. If the amount of deformation from the diameter D0 to the diameter of D1 in step S2 is too small, the difference between the hardness of the monofilament cross-section core and the monofilament edge during the subsequent processing will be less than 10Hv, or even the monofilament cross-section core hardness is lower than the single Wire edge hardness; if the amount of deformation from the diameter D0 to D1 in step S2 is too large, the difference between the core hardness of the monofilament cross-section and the monofilament edge will be greater than 100Hv, or the elongation of the filament will change .
  • the cross-sectional hardness of the monofilaments processed through the above steps S1-S4 is a regular distribution of “ ⁇ ” type.
  • the monofilaments have high cross-section core hardness and low edge hardness.
  • the difference between the monofilament cross-section core hardness and the monofilament edge hardness Between 10Hv and 100Hv, the monofilament does not show delamination during the torsion test.
  • step S5 that is, when the monofilament is twisted into steel cord, there is less wire breakage, which can realize the industrialization of high-strength steel cord produce.
  • the carbon content of the monofilament is not less than 0.60%; in another preferred embodiment, the diameter of the monofilament produced by the preparation method is 0.10 mm ⁇ 0.80mm.
  • the cross-sectional hardness distribution of the monofilament produced according to the method of the present invention can be detected in the following manner:
  • the cross-section of the monofilament is measured from two mutually perpendicular linear directions with X and Y using a hardness tester.
  • Position 4 is the core of the monofilament, and positions 1 and 7 are the sides of the monofilament. The distance between position 1 or position 7 and the surface of the monofilament is less than 10% of the diameter of the monofilament.
  • Position 2 and position 3 are the distance 1/3, 2/3, 5 and 5 respectively.
  • Position 6 is the average of 1/3 and 2/3 of the distance between position 4 and position 7, respectively.
  • the detection result of the cross-section hardness of the monofilament of the present invention is shown in FIG. 2.
  • the cross-section hardness is regularly distributed in the shape of “ ⁇ ”.
  • the difference in the hardness of the cross-section core of the monofilament and the hardness of the monofilament edge refers to the maximum difference in hardness between the position 4 of the core detected in the X direction or the Y direction and other positions.
  • Heat-treated electroplated steel wire with a diameter of 2.30mm is drawn into a 0.75mm diameter steel wire, followed by an intermediate frequency tempering treatment for 0.8 seconds, with an intermediate frequency power of 20KW, and then drawn into a single wire with a diameter of 0.35mm.
  • the strain accounts for 60% of the true strain of the steel wire when drawing from 2.30mm to 0.35mm, and is twisted on a double-twisting machine to become 2+2 ⁇ 0.35 steel cord.
  • Heat-treated electroplated steel wire with a diameter of 2.30mm is drawn into a wire with a diameter of 0.50mm, followed by an intermediate frequency tempering treatment for 2 seconds, with an intermediate frequency power of 12KW, and then drawn into a single wire with a diameter of 0.35mm, and the true wire is drawn from 2.30mm to 0.50mm
  • the strain accounts for 81% of the true strain of the steel wire when drawn from 2.30mm to 0.35mm, and is twisted on a double-twisting machine to become 2+2 ⁇ 0.35 steel cord.
  • the monofilament twist is not layered, the monofilament has a high cross-sectional core hardness and a low edge hardness, and the twist of the steel cord is manufactured.
  • the twisted wire rate is much lower than that of Comparative Example 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ropes Or Cables (AREA)

Abstract

Disclosed is a steel cord manufactured by twisting a single wire. The hardness of the cross section of the single wire is regularly distributed in an inverted "V" shape. The hardness of the core of the cross section of the single wire is high, while the hardness of the edge thereof is low. The difference between the hardness of the core and of the edge of the cross section of the single wire is 10-100 Hv. The present invention further relates to a method for manufacturing the steel cord, and a tire provided with the steel cord. The single wire does not delaminate during a twisting test process, and there are less broken wires when the single wire is twisted into the steel cord during a production process; therefore, the manufacturing method is suitable for the batch production of single wires of steel cords with ultra-high strength and above, and for the batch production of steel cords.

Description

一种钢帘线及其制造方法及具有此钢帘线的轮胎Steel cord and manufacturing method thereof and tire with the steel cord 技术领域Technical field
本发明涉及子午线轮胎用钢帘线设计及生产技术领域，特别涉及一种钢帘线及其制造方法及具有此钢帘线的轮胎。The invention relates to the technical field of design and production of steel cords for radial tires, in particular to a steel cord and a method for manufacturing the same, and a tire having the steel cord.
背景技术Background technique
钢帘线是车辆子午线轮胎的主要骨架材料，其质量的优劣直接影响着轮胎的使用寿命。钢帘线是子午线轮胎的主要受力部件，在很大程度上决定着轮胎的强度和充气后的轮廓，钢帘线只有具备足够的强度和刚度，轮胎的承载能力、安全性能、行驶的舒适性才能得到保障。Steel cord is the main skeleton material of radial tires for vehicles, and its quality directly affects the service life of tires. The steel cord is the main stress component of the radial tire, which largely determines the strength of the tire and the profile after inflation. The steel cord only has sufficient strength and rigidity, the tire's carrying capacity, safety performance, and driving comfort Sex can be guaranteed.
出于降低油耗、节能环保的考量，现在的车用轮胎制造正朝着越来越轻量化发展，用于轮胎骨架材料的钢帘线的强度要求越来越高，国际标准ISO17832中提供了特高强钢帘线(UT帘线,ultra tensile strength cord)的单丝抗拉强度达到4400-2000×D MPa，其中D为单丝直径；行业中也提出了更高强度的MT帘线(mega tensile strength cord)，其单丝抗拉强度达到4700-2000×D MPa。这种高强度的单丝在制造过程中，需要施加强烈的拉拔加工硬化，由于通常单丝截面芯部硬度低而单丝边部硬度高，单丝横截面的芯部与边部的硬度差异大，单丝的截面硬度呈“V”型分布，这样的单丝易在扭转试验过程中出现分层现象，表现在生产过程中则是单丝扭绞为钢帘线时易断丝，难以实现工业化生产，这是由于单丝在扭转或扭绞过程中，单丝截面的芯部剪切变形程度小而边部剪切变形程度大，所以单丝截面芯部硬度低而边部硬度高的状态不利于扭转或扭绞。For the purpose of reducing fuel consumption, energy saving and environmental protection, the manufacture of automobile tires is now becoming more and more lightweight. The strength requirements of steel cords for tire frame materials are becoming higher and higher. The international standard ISO17832 provides special features. The tensile strength of high-strength steel cords (UT cords, ultratensile cords) reaches 4400-2000×DMPa, where D is the diameter of the monofilament; higher strength MT cords (megatensiles) are also proposed in the industry strength), its monofilament tensile strength reaches 4700-2000×D MPa. In the manufacturing process of this high-strength monofilament, it is necessary to apply a strong drawing work hardening, because usually the hardness of the core of the monofilament cross section is low and the hardness of the monofilament side is high, the hardness of the core and the edge of the monofilament cross section The difference is large, and the cross-section hardness of the monofilaments is distributed in a "V" shape. Such monofilaments are prone to delamination during the torsion test. In the production process, the monofilaments are easily broken when twisted into steel cords. It is difficult to achieve industrial production. This is because the monofilament cross-section core has a small degree of shear deformation and a large side shear deformation during the twisting or twisting process, so the monofilament cross-section core hardness is low and the edge hardness The high state is not conducive to twisting or twisting.
US588321提出了一种双模拉拔工艺，通过表面拉拔变形的方式来改变单丝的截面硬度分布；另外，Nippon Steel technical report刊登的《Ultra High Tensile Strength Steel Cord》提出了通过摩擦系数变化以及弯曲的方式来改善单丝的截面硬度分布。US588321 proposes a two-die drawing process, which changes the hardness distribution of the cross-section of the monofilament through surface drawing deformation; in addition, "Ultra High Tensile Strength" Steel "Cord" published by Nippon Steel Technical report proposes to change the friction coefficient and Bending way to improve the cross-section hardness distribution of the monofilament.
但是对于更高强度如UT钢帘线、MT钢帘线来说，以上方式仍存在单丝芯部硬度低而单丝边部硬度高的现象，不利于生产。However, for higher strengths such as UT steel cords and MT steel cords, the above method still has the phenomenon that the hardness of the monofilament core is low and the hardness of the monofilament edge is high, which is not conducive to production.
发明内容Summary of the invention
本发明的目的在于克服现有技术中的不足，提供一种钢帘线及其其制造方法，钢帘线单丝在扭转试验过程中不出现分层现象，在生产过程中单丝扭绞为钢帘线时断丝少，利于钢帘线的批量生产。The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a steel cord and a method for manufacturing the same. The steel cord monofilament does not exhibit delamination during the torsion test. During the production process, the monofilament is twisted as The steel cord has less broken wires, which is beneficial to the mass production of the steel cord.
为达到本发明的目的，本发明的一种钢帘线，由单丝经过扭绞而制成，单丝的截面硬度呈“∧”型规则分布，单丝截面硬度在芯部最高，沿径向至单丝边部截面硬度逐渐减小，单丝截面芯部硬度与边部硬度差异在10Hv～100Hv之间。In order to achieve the purpose of the present invention, a steel cord of the present invention is made by twisting a monofilament. The cross-section hardness of the monofilament is regularly distributed in a “∧” type. The monofilament cross-section hardness is the highest in the core, along the diameter The cross-sectional hardness of the edge of the monofilament gradually decreases, and the difference between the hardness of the core of the monofilament and the hardness of the edge is between 10Hv and 100Hv.
优选的，所述的单丝的碳含量不小于0.60％。Preferably, the carbon content of the monofilament is not less than 0.60%.
再优选的，所述的单丝的直径为0.10mm～0.80mm。More preferably, the diameter of the monofilament is 0.10 mm to 0.80 mm.
根据本发明的另一目的，本发明还公开了一种制造上述钢帘线的制造方法，包括：According to another object of the present invention, the present invention also discloses a method for manufacturing the above steel cord, including:
S1、把钢材延伸到规定的直径D0后进行热处理、电镀；S1, after extending the steel to the specified diameter D0, heat treatment and electroplating;
S2、对经过步骤S1处理得到的钢丝拉拔至预定的直径D1；S2. Drawing the steel wire obtained by the step S1 to a predetermined diameter D1;
S3、对经过步骤S2处理得到的钢丝进行中频回火处理，使得钢丝的截面硬度呈“∧”型规则分布，钢丝的截面芯部硬度高而边部硬度低；S3. Perform intermediate frequency tempering treatment on the steel wire processed in step S2, so that the cross-sectional hardness of the steel wire is regularly distributed in a "∧" type, the core hardness of the cross-section of the steel wire is high, and the hardness of the edge is low;
S4、对经过步骤S3处理得到的钢丝拉拔成单丝D2，使得单丝的截面硬度呈“∧”型规则分布，单丝的截面芯部硬度高而边部硬度低，单丝截面芯部硬度与边部硬度差异在10Hv～100Hv之间；S4. Drawing the steel wire processed in step S3 into a monofilament D2, so that the cross-section hardness of the monofilament is regularly distributed in a "∧" type, the monofilament has a high cross-section core hardness and a low edge hardness, and the monofilament cross-section core part The difference between hardness and edge hardness is between 10Hv～100Hv;
S5、对经过步骤S4处理得到的至少一根单丝进行扭绞得到钢帘线；S5. Twist at least one monofilament obtained by the step S4 to obtain a steel cord;
其中，D0＞D1＞D2。Among them, D0>D1>D2.
优选的，所述步骤S3中，中频回火的功率在10KW～25KW之间，中频回火时间0.2～5秒。Preferably, in the step S3, the power of the intermediate frequency tempering is between 10KW and 25KW, and the intermediate frequency tempering time is 0.2 to 5 seconds.
再优选的，在步骤S2中，D0拉拔至D1时钢丝的真应变占D0拉拔至D2时钢丝的真应变的50％～95％。More preferably, in step S2, the true strain of the wire when D0 is drawn to D1 accounts for 50% to 95% of the true strain of the wire when D0 is drawn to D2.
根据本发明的另一目的，本发明还公开了一种轮胎，其包括上述的钢帘线。According to another object of the present invention, the present invention also discloses a tire including the steel cord described above.
本发明的上述钢帘线的单丝生产方法，制造的高强度的单丝在扭转试验过程中不出现分层现象，在生产过程中单丝扭绞为钢帘线时断丝少，适合特高强及以上强度的钢帘线的单丝及钢帘线的批量生产， 满足轮胎轻量化的发展需求。According to the method for producing monofilaments of steel cords of the present invention, the manufactured high-strength monofilaments do not exhibit delamination during torsion testing. During the production process, the monofilaments are twisted into steel cords with few broken wires, which is suitable for special features. Mass production of high-strength and above-strength steel cord monofilaments and steel cords meets the demand for lightweight development of tires.
附图说明BRIEF DESCRIPTION
通过下面结合附图的详细描述，本发明前述的和其他的目的、特征和优点将变得显而易见。其中：The foregoing and other objects, features, and advantages of the present invention will become apparent through the following detailed description in conjunction with the accompanying drawings. among them:
图1所示为本发明的钢帘线单丝截面硬度测试位置的示意图；FIG. 1 is a schematic diagram showing the test position of the hardness of the steel cord monofilament section of the present invention;
图2所示为本发明的钢帘线单丝的截面硬度曲线分布示意图。2 is a schematic diagram showing the distribution of the cross-section hardness curve of the steel cord monofilament of the present invention.
具体实施方式detailed description
下面结合附图和具体实施例对本发明的技术内容、特点及优点作进一步详细描述。The technical content, features, and advantages of the present invention will be further described in detail below in conjunction with the drawings and specific embodiments.
本发明的一实施例的一种钢帘线，其制造方法包括如下步骤：A steel cord according to an embodiment of the present invention, the manufacturing method includes the following steps:
S1、对由钢材延伸得到一定直径D0的钢丝进行热处理和电镀黄铜处理；通过热处理获得细珠光体组织以便于后续进一步加工，电镀黄铜使得钢丝利于后续拉拔及提高钢帘线与橡胶的粘合力；S1, heat treatment and electroplating brass treatment of steel wire with a certain diameter D0 extended from steel; fine pearlite structure is obtained through heat treatment for subsequent further processing, and electroplated brass makes the steel wire convenient for subsequent drawing and improves the steel cord and rubber Adhesion
S2、对经过步骤S1处理得到的钢丝在水箱拉丝机中经过多道次拉拔至直径D1，或是在干式钢丝拉拔机经过多道次拉拔至直径D1；S2. The steel wire processed in step S1 is drawn to the diameter D1 in multiple passes in the water tank drawing machine, or is drawn to the diameter D1 in multiple passes in the dry wire drawing machine;
S3、对经过步骤S2处理得到的钢丝进行中频回火处理，中频回火的功率在10KW～25KW之间，中频回火时间0.2～5秒；S3. Perform intermediate frequency tempering on the steel wire processed in step S2. The power of intermediate frequency tempering is between 10KW and 25KW, and the intermediate frequency tempering time is 0.2 to 5 seconds;
在本步骤中，采用中频感应加热钢丝，因为中频感应加热钢丝具有集肤效应，可以使得直径D1的钢丝的截面硬度呈“∧”型规则分布，钢丝的截面芯部硬度高而边部硬度低。中频回火的功率与回火时间对于钢丝的处理效果至关重要，功率与电压过低，或者中频回火时间过短，则钢丝的截面硬度分布不能获得需要的状态；中频回火的功率与电压过高，或者中频回火时间过长，则会使得钢丝组织碳化而不利于后续的加工。In this step, the intermediate frequency induction heating steel wire is used, because the intermediate frequency induction heating steel wire has a skin effect, which can make the cross-sectional hardness of the steel wire with a diameter D1 of "∧" type regular distribution, the cross-sectional hardness of the steel wire is high, and the hardness of the edge is low . The power and tempering time of the intermediate frequency tempering are very important for the treatment effect of the steel wire. If the power and voltage are too low, or the intermediate frequency tempering time is too short, the cross-section hardness distribution of the steel wire cannot obtain the required state; the power and tempering of the intermediate frequency tempering If the voltage is too high, or the intermediate frequency tempering time is too long, the steel wire structure will be carbonized and not conducive to subsequent processing.
S4、对经过步骤S3处理得到的钢丝在水箱拉丝机中，经过多道次拉拔成为直径为D2的单丝；S4. The steel wire processed in step S3 is drawn into a monofilament with a diameter of D2 in a water tank drawing machine through multiple passes;
S5、对经过步骤S4处理得到的单丝在双捻机或管捻机扭绞制得钢帘线。S5. Twist the monofilament obtained by the step S4 in a double twisting machine or a tube twisting machine to obtain a steel cord.
值得注意的是，步骤S2中，钢丝从直径D0拉拔至D1时钢丝的真应变占从直径D0拉拔至D2时钢丝的真应变的50％～95％。步骤S2中从 直径D0拉拔至D1的直径的变形量如果过小，会使后续加工时单丝截面芯部硬度与单丝边部硬度差异小于10Hv，甚至单丝截面芯部硬度低于单丝边部硬度；步骤S2中从直径D0拉拔至D1的直径的变形量如果过大，会使得单丝截面芯部硬度与单丝边部硬度差异大于100Hv，或者单丝的延伸率发生改变。It is worth noting that in step S2, the true strain of the steel wire when drawing from the diameter D0 to D1 accounts for 50% to 95% of the true strain of the steel wire when drawing from the diameter D0 to D2. If the amount of deformation from the diameter D0 to the diameter of D1 in step S2 is too small, the difference between the hardness of the monofilament cross-section core and the monofilament edge during the subsequent processing will be less than 10Hv, or even the monofilament cross-section core hardness is lower than the single Wire edge hardness; if the amount of deformation from the diameter D0 to D1 in step S2 is too large, the difference between the core hardness of the monofilament cross-section and the monofilament edge will be greater than 100Hv, or the elongation of the filament will change .
经过上述的步骤S1-S4处理的单丝的截面硬度呈“∧”型规则分布，单丝的截面芯部硬度高而边部硬度低，单丝的截面芯部硬度与单丝边部硬度差异在10Hv～100Hv之间，单丝在扭转试验过程中不出现分层现象，经过步骤S5处理的过程即单丝扭绞为钢帘线时断丝少，可实现高强度的钢帘线的工业化生产。The cross-sectional hardness of the monofilaments processed through the above steps S1-S4 is a regular distribution of “∧” type. The monofilaments have high cross-section core hardness and low edge hardness. The difference between the monofilament cross-section core hardness and the monofilament edge hardness Between 10Hv and 100Hv, the monofilament does not show delamination during the torsion test. After the process of step S5, that is, when the monofilament is twisted into steel cord, there is less wire breakage, which can realize the industrialization of high-strength steel cord produce.
在一优选的实施方式中，为了达到较佳的效果，所述的单丝的碳含量不小于0.60％；在另一优选的实施方式中，所述制备方法制得的单丝的直径为0.10mm～0.80mm。In a preferred embodiment, in order to achieve better results, the carbon content of the monofilament is not less than 0.60%; in another preferred embodiment, the diameter of the monofilament produced by the preparation method is 0.10 mm～0.80mm.
按照本发明的方法制得单丝的截面硬度分布可采用如下方式检测：The cross-sectional hardness distribution of the monofilament produced according to the method of the present invention can be detected in the following manner:
如图1所示，对单丝的截面分别从X、Y两个相互垂直的直线方向采用硬度仪进行测量，位置4为单丝的截面芯部，位置1和位置7为单丝的截面边部，位置1或位置7与单丝表面的距离小于单丝直径的10％，位置2和位置3分别是位置1和位置4之间距离的均分1/3、2/3，位置5和位置6分别是位置4和位置7之间距离的均分1/3、2/3。As shown in Fig. 1, the cross-section of the monofilament is measured from two mutually perpendicular linear directions with X and Y using a hardness tester. Position 4 is the core of the monofilament, and positions 1 and 7 are the sides of the monofilament. The distance between position 1 or position 7 and the surface of the monofilament is less than 10% of the diameter of the monofilament. Position 2 and position 3 are the distance 1/3, 2/3, 5 and 5 respectively. Position 6 is the average of 1/3 and 2/3 of the distance between position 4 and position 7, respectively.
本发明的单丝的截面硬度检测结果如图2所示，截面硬度呈“∧”型规则分布，单丝截面硬度在芯部最高，沿径向逐渐减小。单丝的截面芯部硬度与单丝边部硬度差异指的是沿X方向或Y方向检测的芯部的位置4与其它位置之间的硬度最大差异。The detection result of the cross-section hardness of the monofilament of the present invention is shown in FIG. 2. The cross-section hardness is regularly distributed in the shape of “∧”. The difference in the hardness of the cross-section core of the monofilament and the hardness of the monofilament edge refers to the maximum difference in hardness between the position 4 of the core detected in the X direction or the Y direction and other positions.
实施例1：Example 1:
采用直径2.30mm热处理电镀钢丝拉拔为直径0.75mm钢丝，再进行0.8秒的中频回火处理，中频功率20KW，然后拉拔为直径0.35mm单丝，2.30mm拉拔至0.75mm时钢丝的真应变占2.30mm拉拔至0.35mm时钢丝的真应变的60％，在双捻机上扭绞成为2+2×0.35钢帘线。Heat-treated electroplated steel wire with a diameter of 2.30mm is drawn into a 0.75mm diameter steel wire, followed by an intermediate frequency tempering treatment for 0.8 seconds, with an intermediate frequency power of 20KW, and then drawn into a single wire with a diameter of 0.35mm. When the wire is drawn from 2.30mm to 0.75mm The strain accounts for 60% of the true strain of the steel wire when drawing from 2.30mm to 0.35mm, and is twisted on a double-twisting machine to become 2+2×0.35 steel cord.
实施例2：Example 2:
采用直径2.30mm热处理电镀钢丝拉拔为直径0.50mm钢丝，再进行2秒的中频回火处理，中频功率12KW，然后拉拔为直径0.35mm单丝，2.30mm拉拔至0.50mm时钢丝的真应变占2.30mm拉拔至0.35mm时钢丝的真应变的81％，在双捻机上扭绞成为2+2×0.35钢帘线。Heat-treated electroplated steel wire with a diameter of 2.30mm is drawn into a wire with a diameter of 0.50mm, followed by an intermediate frequency tempering treatment for 2 seconds, with an intermediate frequency power of 12KW, and then drawn into a single wire with a diameter of 0.35mm, and the true wire is drawn from 2.30mm to 0.50mm The strain accounts for 81% of the true strain of the steel wire when drawn from 2.30mm to 0.35mm, and is twisted on a double-twisting machine to become 2+2×0.35 steel cord.
以制造2+2×0.35相同结构的钢帘线为例，本发明和现有技术的对比例进行比较试验，试验结果见表1。Taking the manufacturing of steel cords with the same structure of 2+2×0.35 as an example, comparative tests of the present invention and the prior art are conducted. The test results are shown in Table 1.
Figure PCTCN2018120154-appb-000001
Figure PCTCN2018120154-appb-000001
从表1可以看出，与比较例1相比，本发明的实施例1～2中单丝扭转不分层，单丝的截面芯部硬度高而边部硬度低，制造钢帘线的扭绞断丝率远低于比较例1。As can be seen from Table 1, compared with Comparative Example 1, in Examples 1 to 2 of the present invention, the monofilament twist is not layered, the monofilament has a high cross-sectional core hardness and a low edge hardness, and the twist of the steel cord is manufactured. The twisted wire rate is much lower than that of Comparative Example 1.
本发明并不局限于所述的实施例，本领域的技术人员在不脱离本发明的精神即公开范围内，仍可作一些修正或改变，故本发明的权利保护范围以权利要求书限定的范围为准。The present invention is not limited to the described embodiments, and those skilled in the art may still make some amendments or changes within the disclosed scope without departing from the spirit of the present invention, so the scope of protection of the rights of the present invention is defined by the claims The scope shall prevail.

Claims (7)

  1. 一种钢帘线，由单丝经过扭绞而制成，其特征在于，所述的钢帘线的单丝的截面硬度呈“∧”型规则分布，单丝截面硬度在芯部最高，沿径向至单丝边部截面硬度逐渐减小，单丝截面芯部硬度与边部硬度差异在10Hv～100Hv之间。A steel cord is made by twisting monofilaments, characterized in that the cross-section hardness of the monofilaments of the steel cords is regularly distributed in a “∧” type. The monofilament cross-section hardness is the highest in the core, along the The cross-sectional hardness from the radial direction to the monofilament edge gradually decreases, and the difference between the hardness of the monofilament cross-section core and the edge hardness is between 10Hv and 100Hv.
  2. 如权利要求1所述的一种钢帘线，其特征在于，所述的单丝的碳含量不小于0.60％。The steel cord of claim 1, wherein the carbon content of the monofilament is not less than 0.60%.
  3. 如权利要求1或2所述的一种钢帘线，其特征在于，所述的单丝的直径为0.10mm～0.80mm。The steel cord according to claim 1 or 2, wherein the diameter of the monofilament is 0.10 mm to 0.80 mm.
  4. 一种制造如权利要求1或2或3所述的钢帘线的制造方法，其特征在于，所述的制造方法包括如下步骤：A method for manufacturing a steel cord according to claim 1 or 2 or 3, characterized in that the method includes the following steps:
    S1、把钢材延伸到规定的直径D0后进行热处理、电镀；S1, after extending the steel to the specified diameter D0, heat treatment and electroplating;
    S2、对经过步骤S1处理得到的钢丝拉拔至预定的直径D1；S2. Drawing the steel wire obtained by the step S1 to a predetermined diameter D1;
    S3、对经过步骤S2处理得到的钢丝进行中频回火处理，使得钢丝的截面硬度呈“∧”型规则分布，钢丝的截面芯部硬度高而边部硬度低；S3. Perform intermediate frequency tempering treatment on the steel wire processed in step S2, so that the cross-sectional hardness of the steel wire is regularly distributed in a "∧" type, the core hardness of the cross-section of the steel wire is high, and the hardness of the edge is low;
    S4、对经过步骤S3处理得到的钢丝拉拔成单丝D2，使得单丝的截面硬度呈“∧”型规则分布，单丝的截面芯部硬度高而边部硬度低，单丝截面芯部硬度与边部硬度差异在10Hv～100Hv之间；S4. Drawing the steel wire processed in step S3 into a monofilament D2, so that the cross-section hardness of the monofilament is regularly distributed in a "∧" type, the monofilament has a high cross-section core hardness and a low edge hardness, and the monofilament cross-section core part The difference between hardness and edge hardness is between 10Hv～100Hv;
    S5、对经过步骤S4处理得到的至少一根单丝进行扭绞得到钢帘线；S5. Twist at least one monofilament obtained by the step S4 to obtain a steel cord;
    其中，D0＞D1＞D2。Among them, D0>D1>D2.
  5. 如权利要求4所述的一种钢帘线的制造方法，其特征在于，所述步骤S3中，中频回火的功率在10KW～25KW之间，中频回火时间0.2～5秒。The method for manufacturing a steel cord according to claim 4, wherein in step S3, the power of the intermediate frequency tempering is between 10KW and 25KW, and the intermediate frequency tempering time is 0.2 to 5 seconds.
  6. 如权利要求4所述的一种钢帘线的制造方法，其特征在于，在步骤S2中，D0拉拔至D1时钢丝的真应变占D0拉拔至D2时钢丝的真应变的50％～95％。The method for manufacturing a steel cord according to claim 4, wherein in step S2, the true strain of the steel wire when D0 is drawn to D1 accounts for 50% of the true strain of the steel wire when D0 is drawn to D2 95%.
  7. 一种轮胎，其特征在于，所述的轮胎包括根据权利要求4-6任一项的制造方法制造的钢帘线。A tire, characterized in that the tire comprises a steel cord manufactured according to any one of claims 4-6.
    。.
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