阅读说明：本技术 一种1×d1+6+12×d2+7×8×d2钢丝帘线 (1 xd 1+6+12 xd 2+7 × 8 xd 2 steel cord ) 是由 马卫铭 刘锦兰 王爱萍 刘湘慧 潘振国 曹恒祥 王燕 于 2020-04-27 设计创作，主要内容包括：本发明公开了一种1×d1+6+12×d2+7×8×d2钢丝帘线,包括芯股股线钢丝和外层股股线钢丝,所述外层股股线钢丝沿着所述芯股股线钢丝编捻,并均匀捻布在芯股股线钢丝上,所述芯股股线钢丝由内而外包括至少一根芯股第一层钢丝、至少六根芯股第二层钢丝和至少十二根芯股第三层钢丝编捻而成,所述外层股股线钢丝包括至少一根外层股第一层钢丝和至少六根第二层钢丝编捻而成；本发明八股外层股股线钢丝之间的间隙较大,有利于橡胶充分渗入到芯股钢丝,避免了因没有渗入足够的橡胶导致各层钢丝之间的点接触摩擦,进而避免了钢丝帘线承载能力因磨损而失效的问题；改善了轮胎的抗腐蚀、耐疲劳、抗冲击性能及粘合保持力,提高了轮胎的使用寿命。(The invention discloses a1 xd 1+6+12 xd 2+7 xd 8 xd 2 steel cord, which comprises core strand steel wires and outer strand steel wires, wherein the outer strand steel wires are twisted along the core strand steel wires and are uniformly twisted on the core strand steel wires; the gaps among the eight strands of outer strand steel wires are larger, so that rubber can be fully infiltrated into the core strand steel wires, point contact friction among the steel wires of all layers due to insufficient infiltration of rubber is avoided, and the problem that the bearing capacity of a steel cord is failed due to abrasion is further avoided; the corrosion resistance, fatigue resistance, impact resistance and adhesion retention of the tire are improved, and the service life of the tire is prolonged.)

1. A1 xd 1+6+12 xd 2+7 × 8 xd 2 steel cord, characterized in that, it comprises a core strand steel wire (1) and an outer strand steel wire (2), said outer strand steel wire (2) is twisted along said core strand steel wire (1) and uniformly twisted on the core strand steel wire (1), said core strand steel wire (1) comprises at least one core strand first layer steel wire (3), at least six core strand second layer steel wires (4) and at least twelve core strand third layer steel wires (5) from inside to outside, said outer strand steel wire (2) comprises at least one outer strand first layer steel wire (6) and at least six second layer steel wires (7) which are twisted.

2. A1 xd 1+6+12 xd 2+7 xd 8 xd 2 steel cord as claimed in claim 1, wherein the diameter of the core strand second layer of steel wires (4) and the core strand third layer of steel wires (5) is 0.015 mm.

3. A1 xd 1+6+12 xd 2+7 xd 8 xd 2 steel cord as claimed in claim 1, wherein the diameter of the core strand first layer of steel filaments (3) is at least larger than the diameter of the core strand second layer of steel filaments (4) and the core strand third layer of steel filaments (5).

4. A1 xd 1+6+12 xd 2+7 xd 8 xd 2 steel cord as claimed in claim 1, wherein said core strand second layer steel wires (4), core strand third layer steel wires (5), outer layer strand first layer steel wires (6) and outer layer strand second layer steel wires (7) have the same diameter, and the diameter is 0.165-0.38 mm.

5. A1 xd 1+6+12 xd 2+7 xd 8 xd 2 steel cord as claimed in claim 1, wherein the twisting directions of said core strand steel filaments (1) and said outer layer strand steel filaments (2) are opposite.

6. A1 xd 1+6+12 xd 2+7 xd 8 xd 2 steel cord as claimed in claim 1, wherein said core strand first layer of steel filaments (3) is untwisted with said outer layer strand first layer of steel filaments (6).

7. A1 xd 1+6+12 xd 2+7 xd 8 xd 2 steel cord as claimed in claim 1, wherein said core strand third layer of steel filaments (5) and said outer layer strand second layer of steel filaments (7) have the same lay length.

8. A1 xd 1+6+12 xd 2+7 xd 8 xd 2 steel cord as claimed in claim 1, wherein the lay length of said core strand second layer of steel filaments (4) is 0.5 times the lay length of said core strand third layer of steel filaments (5).

Technical Field

The invention relates to a1 xd 1+6+12 xd 2+7 × 8 xd 2 steel cord, belonging to the technical field of steel cords.

Background

The steel wire cord is an important component in an engineering radial tire framework material, the engineering radial tire is usually formed by weaving and twisting a 7 multiplied by d +0.15HT structure steel wire cord, and the 7 multiplied by d core strand, six 7 multiplied by d outer layer strand and a 0.15mm outer winding wire, wherein the core strand and the outer layer strand are of the same structure, the diameters of steel wires are the same, the 7 multiplied by d structure twisting direction is S, the twisting pitch is 12.5mm, the six outer layer strand twisting directions are Z, the twisting pitch is 20.0mm, the outer winding wire twisting direction is S, and the twisting pitch is 5.0mm, the arrangement of each layer of strand is compact, the gap between the outer layer strand strands is small, and rubber cannot effectively permeate the steel wire of the core strand so that the air content in the cord is high. The structure of the steel cord and the strength, bending stiffness and adhesive property with rubber thereof have direct influence on the tire, and the defects caused by unreasonable structural design cannot be completely compensated only by controlling the production process of the steel cord. During the use of the radial tire, the problem of the failure of the bearing capacity of the cord is easily caused by the insufficient strength of the steel wire cord or the corrosion and abrasion of the steel wire.

Disclosure of Invention

The invention aims to provide a1 xd 1+6+12 xd 2+7 xd 8 xd 2 steel cord, which aims to solve the defects that the strength of the steel cord is insufficient, the gap between outer layer strands is small, and rubber cannot effectively permeate into steel wires of core strands, so that the air content in the cord is high.

A1 xd 1+6+12 xd 2+7 × 8 xd 2 steel cord comprises a core strand steel wire and an outer strand steel wire, wherein the outer strand steel wire is twisted along the core strand steel wire and evenly twisted on the core strand steel wire, the core strand steel wire comprises at least one core strand first layer steel wire, at least six core strand second layer steel wires and at least twelve core strand third layer steel wires from inside to outside, and the outer strand steel wire comprises at least one outer strand first layer steel wire and at least six second layer steel wires.

Preferably, the diameter of the second layer of steel wires and the third layer of steel wires of the core strand is 0.015 mm.

Preferably, the diameter of the steel filaments of the first layer of the core strand is at least larger than the diameter of the steel filaments of the second layer of the core strand and the steel filaments of the third layer of the core strand.

Preferably, the diameters of the second layer of steel wires of the core strand, the third layer of steel wires of the core strand, the first layer of steel wires of the outer layer strand and the second layer of steel wires of the outer layer strand are the same, and the diameters are 0.165-0.38 mm.

Preferably, the twisting directions of the core strand steel wires and the outer layer strand steel wires are opposite.

Preferably, the core strand first layer of steel filaments is untwisted with the outer layer strand first layer of steel filaments.

Preferably, the lay lengths of the third layer of steel wires of the core strand and the second layer of steel wires of the outer layer strand are the same.

Preferably, the lay length of the second layer of steel wires of the core strand is 0.5 times of the lay length of the third layer of steel wires of the core strand.

Compared with the prior art, the invention has the following beneficial effects:

the gaps among the eight strands of outer strand steel wires are larger, so that rubber can be fully infiltrated into the core strand steel wires, point contact friction among the steel wires of all layers due to insufficient infiltration of rubber is avoided, and the problem that the bearing capacity of a steel cord is failed due to abrasion is further avoided;

(2) the invention improves the corrosion resistance, fatigue resistance, impact resistance and adhesion retention of the tire, and prolongs the service life of the tire.

Drawings

FIG. 1 is a schematic cross-sectional view of a steel cord of the present invention;

fig. 2 is a schematic cross-sectional view of a prior art structural steel cord.

In the figure: 1. Core strand wire D1; 2. outer ply strand wires D2; 3. core strand first layer steel filaments a 1; 4. core strand second layer steel filaments a 2; 5. core strand third layer steel filaments a 3; 6. the outer ply first layer of steel filaments a 1; 7. the outer ply second layer of steel filaments a 2.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1, a1 xd 1+6+12 xd 2+7 xd 8 xd 2 steel cord, the section of which is circular, the outer layer strand wires 2 are twisted around the core strand wires 1 to form a structure in which eight outer layer strand wires 2 are uniformly arranged around one core strand wire 1. The core strand steel wire 1 is formed by weaving and twisting one core strand first layer steel wire 3, six core strand second layer steel wires 4 and twelve core strand third layer steel wires 5, the six core strand second layer steel wires 4 are woven and twisted around the one core strand first layer steel wire 3, and the twelve core strand third layer steel wires 5 are woven and twisted around the six core strand second layer steel wires 4; the outer layer strand wire 2 is formed by weaving and twisting an outer layer strand first layer wire 6 and six outer layer strand first layer wires 7; the diameter d1 of the core strand first layer of steel filaments 3 of the core strand steel filaments 1 must be at least larger than the diameter d2 of the core strand second layer of steel filaments 4 and the diameter d2 of the core strand third layer of steel filaments 5; the diameter d2 of the second layer steel wire of core thigh 4 and the diameter d2 of the third layer steel wire of core thigh 5 are 0.015mm, and the diameter of each layer steel wire in the second layer steel wire of core thigh 4, the third layer steel wire of core thigh 5 and the outer layer thigh steel wire 2 of core thigh strand steel wire 1 is the same, selects for use the steel wire diameter scope to be 0.165~0.38 mm. The core strand steel wires 1 are twisted in the opposite direction to the steel wires in the outer layer strand steel wires 2. The first layer of steel wire 3 of core thigh in core thigh strand steel wire 1 and the outer layer of the first layer of steel wire 6 of outer layer thigh in the strand steel wire 3 do not have the weaving and twisting, and the lay length of core thigh third layer steel wire 5 in core thigh strand steel wire 1 is the same with the lay length of outer layer thigh second layer steel wire 7 in outer layer thigh strand steel wire 2, and the lay length of core thigh second layer steel wire 4 in core thigh strand steel wire 1 is 0.5 times of the lay length of core thigh third layer steel wire 5.

The invention overcomes the defects caused by unreasonable structural design of the steel cord by changing the structure of the steel cord, improves the strength, the glue permeability, the shock resistance and the fatigue resistance of the steel cord, reduces the air content between the steel cord strands of the tire, improves the strength grade of the tire cord and prolongs the service life of the tire.

In the present embodiment, the strength grades of the steel filaments in the core strand steel filament 1 and the outer layer strand steel filament 2 are normal strength NT, high strength HT, ultra-high strength ST, ultra-high strength UT, or ultra-high strength MT. The invention is suitable for weaving and twisting steel wires with different strength grades of common strength NT, high strength HT, ultrahigh strength ST, ultrahigh strength UT or ultrahigh strength MT, and can improve the strength requirement, the glue permeation performance, the impact resistance and the fatigue resistance of the steel wire cord formed by weaving and twisting.