CN112359624A

CN112359624A - N-layer intensive reinforced steel wire cord

Info

Publication number: CN112359624A
Application number: CN202011290520.2A
Authority: CN
Inventors: 刘祥; 马卫铭; 王爱萍; 刘湘慧; 曹恒祥
Original assignee: Jiangsu Xingda Steel Tyre Cord Co Ltd
Current assignee: Jiangsu Xingda Steel Tyre Cord Co Ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-02-12

Abstract

The invention discloses an N-layer intensive reinforced steel wire cord, which comprises a core strand steel wire, at least five second layer strand steel wires, at least ten third layer strand steel wires and at least fifteen outer layer strand steel wires, wherein the second layer strand steel wires are uniformly distributed on the periphery of the core strand steel wires and are twisted along the core strand steel wires; the clearance between the outer strand steel wire is great, is favorable to rubber fully to permeate third layer strand steel wire, and the clearance between third layer strand steel wire, second floor strand steel wire and the core strand steel wire is little, has reduced the air content in the steel cord, has avoided leading to the point contact friction between each layer steel wire because of not permeating sufficient rubber, and then has avoided the problem that steel cord bearing capacity became invalid because of wearing and tearing.

Description

N-layer intensive reinforced steel wire cord

Technical Field

The invention relates to the technical field of steel wire cords, in particular to an N-layer intensive reinforced steel wire cord.

Background

The steel cord is an important component in a radial tire framework material, a 3+9+15 x d steel cord is commonly used for radial tires in the prior art, and is formed by weaving and twisting core strand steel wires 1, middle strand steel wires 5 and outer strand steel wires 4, the steel wires in the core strand steel wires 1, the middle strand steel wires 5 and the outer strand steel wires 4 have the same diameter, the twist direction of the (3 +9+15 x d structure is ZZZ, the twist pitch is 5.0/10.0/16.0mm or 6.3/12.5/18.0mm, the outer strand steel wires 4 are arranged compactly, gaps among the steel wires are small, and rubber cannot effectively permeate into the core strand steel wires 1, so that the air content in the steel 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 an N-layer intensive reinforced steel wire cord to solve the problems that in the prior art, the strength of the steel wire cord is insufficient, gaps among outer strand steel wires are small, and rubber cannot effectively permeate into core strand steel wires, so that the air content in the steel wire cord is high.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides an N-layer intensive reinforced steel wire cord which comprises a core strand steel wire, at least five second-layer strand steel wires, at least ten third-layer strand steel wires and at least fifteen outer-layer strand steel wires, wherein the second-layer strand steel wires are uniformly distributed on the periphery of the core strand steel wires and are twisted along the core strand steel wires, the third-layer strand steel wires are uniformly distributed on the periphery of the second-layer strand steel wires and are twisted along the second-layer strand steel wires, and the outer-layer strand steel wires are uniformly distributed on the periphery of the third-layer strand steel wires and are twisted along the third-layer strand steel wires.

Furthermore, the diameter of the core strand steel wire is smaller than that of the second layer strand steel wire, the diameter of the second layer strand steel wire is smaller than that of the third layer strand steel wire, and the diameter of the third layer strand steel wire is smaller than or equal to that of the outer layer strand steel wire.

Furthermore, the diameter of the steel wire of the core strand is 0.12-0.20mm, the diameter of the steel wire of the second layer strand is 0.17-0.25mm, and the diameter of the steel wire of the third layer strand is 0.185-0.28 mm.

Furthermore, the core strand steel wires are not twisted, and the twisting directions of the second layer strand steel wires, the third layer strand steel wires and the outer layer strand steel wires are the same.

Furthermore, the core strand steel wires have no lay length, the second layer strand steel wires, the third layer strand steel wires and the outer layer strand steel wires have the same lay length, and the lay length is 12.5-25.0 mm.

Further, the cross section of the N layers of intensive reinforcing steel cords is regular pentagon.

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

the invention provides an N-layer intensive reinforced steel cord which comprises a core strand steel wire, at least five second layer strand steel wires, at least ten third layer strand steel wires and at least fifteen outer layer strand steel wires, wherein gaps among the at least fifteen outer layer strand steel wires are large, so that rubber can be fully infiltrated into the third layer strand steel wires; the steel cord provided by the invention is used for manufacturing the tire, so that the corrosion resistance, fatigue resistance, impact resistance and adhesion retention of the tire can be improved, and the service life of the tire is prolonged.

Drawings

FIG. 1 is a schematic structural view of an N-ply intensive reinforcing steel cord provided in an embodiment of the present invention;

fig. 2 is a schematic view of a structure of a steel cord generally used in the prior art.

In the figure: 1-core strand steel wire, 2-second layer strand steel wire, 3-third layer strand steel wire, 4-outer layer strand steel wire and 5-middle layer strand steel wire.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides an N-layer intensive steel cord, which includes a core strand steel wire 1, at least five second layer strand steel wires 2, at least ten third layer strand steel wires 3, and at least fifteen outer layer strand steel wires 4, the second layer strand steel wires 2 are uniformly distributed on the periphery of the core strand steel wires 1 and are twisted along the core strand steel wires 1, the third layer strand steel wires 3 are uniformly distributed on the periphery of the second layer strand steel wires 2 and are twisted along the second layer strand steel wires 2, the outer layer strand steel wires 4 are uniformly distributed on the periphery of the third layer strand steel wires 3 and are twisted along the third layer strand steel wires 3, the present invention is a steel cord with a structure of 1 xd 1+5 xd 2+10 xd 3+15 xd 4, the present invention overcomes the defect of the prior art due to unreasonable design of the steel cord with a structure of 3+9+15 xd by changing the diameter ratio of monofilaments between each layer of the steel cord, the strength, the shock resistance and the fatigue resistance of the steel cord are improved, the air content between the steel cord strands of the tire is reduced, the strength grade of the tire cord is improved, and the service life of the tire is prolonged.

The diameter of the core strand steel wire 1 is smaller than that of the second layer strand steel wire 2, the diameter of the second layer strand steel wire 2 is smaller than that of the third layer strand steel wire 3, and the diameter of the third layer strand steel wire 3 is smaller than or equal to that of the outer layer strand steel wire 4.

The diameter of the core strand steel wire 1 is 0.12-0.20mm, the diameter of the second layer strand steel wire 2 is 0.17-0.25mm, and the diameter of the third layer strand steel wire 3 is 0.185-0.28 mm.

The core strand steel wire 1 is not twisted, and the twisting directions of the second layer strand steel wire 2, the third layer strand steel wire 3 and the outer layer strand steel wire 4 are the same.

The core strand steel wire 1 has no lay length, the second layer strand steel wire 2, the third layer strand steel wire 3 and the outer layer strand steel wire 4 have the same lay length, and the lay length is 12.5-25.0 mm.

The cross section of the N layers of intensive reinforced steel wire cords is regular pentagon.

The strength grades of the steel wires in the core strand steel wire 1, the second layer strand steel wire 2, the third layer strand steel wire 3 and the outer layer strand steel wire 4 are normal strength NT, high strength HT, ultrahigh strength ST, ultrahigh strength UT or ultrahigh strength MT.

Example 1:

an N-layer intensive reinforced steel cord comprises a core strand steel wire 1 with the diameter of 0.165mm, five second layer strand steel wires 2 with the diameter of 0.205mm, ten third layer strand steel wires 3 with the diameter of 0.23mm and fifteen outer layer strand steel wires 4 with the diameter of 0.23mm, wherein the core strand steel wires 1 are free of weaving and twisting, the twisting directions of the second layer strand steel wires 2, the third layer strand steel wires 3 and the outer layer strand steel wires 4 are the same, the twisting directions are Z twisting, the core strand steel wires 1 are free of twisting pitches, the twisting pitches of the second layer strand steel wires 2, the third layer strand steel wires 3 and the outer layer strand steel wires 4 are the same, and the twisting pitches are 18.0mm, and the steel cord with the 0.165+5 × 0.205+10 × 0.23+15 × 0.23HT structure provided by the embodiment 1 of the invention is used for a radial tire reinforced framework material.

The diameter of a steel cord of 3+9+15 × 0.245HT structure commonly used in the prior art is 1.51mm, wherein the diameters of the core strand steel wire 1, the middle strand steel wire 5 and the outer strand steel wire 4 are all 0.245mm, the twisting directions of the core strand steel wire 1, the middle strand steel wire 5 and the outer strand steel wire 4 are all ZZZ twisting, the pitch of the core strand steel wire 1 is 6.3mm, the pitch of the middle strand steel wire 5 is 12.5mm, and the pitch of the outer strand steel wire 4 is 18.0mm, table 1 shows the performance indexes of the steel cord of 0.165+5 × 0.205+10 × 0.23+15 × 0.23HT structure provided in example 1 and the steel cord of 3+9+15 × 0.245HT structure commonly used in the prior art.

TABLE 1

As can be seen from table 1, the steel cord of example 1 has a breaking force of not less than 3750N, a breaking force/linear density of 386.5N/(mm), an adhesive force of not less than 1600N/25mm, a breaking force of not less than 3730N of a steel cord of the prior art, a breaking force/linear density of 363.5N/(/ g/m), and an adhesive force of not less than 1600N/25mm, and it can be obtained by comparison that the steel cord of example 1 is a high-strength steel wire, and the strength of the steel cord, the bleeding rate between the outer strand steel wires 4, and the fatigue resistance are improved by changing the diameter ratio of the single wires among the core strand steel wire 1, the second layer strand steel wire 2, the third layer strand steel wire 3, and the outer layer strand steel wires 4.

Example 2:

an N-layer intensive reinforced steel cord comprises a core strand steel wire 1 with the diameter of 0.15mm, five second layer strand steel wires 2 with the diameter of 0.19mm, ten third layer strand steel wires 3 with the diameter of 0.215mm and fifteen outer layer strand steel wires 4 with the diameter of 0.215mm, wherein the core strand steel wires 1 are free of weaving and twisting, the twisting directions of the second layer strand steel wires 2, the third layer strand steel wires 3 and the outer layer strand steel wires 4 are the same, the twisting directions are Z twisting, the core strand steel wires 1 are free of twisting pitches, the twisting pitches of the second layer strand steel wires 2, the third layer strand steel wires 3 and the outer layer strand steel wires 4 are the same, and the twisting pitches are 18.0mm, and the steel cord with the structure of 0.15+5 x 0.19+10 x 0.215+15 x 0.215ST is used for a radial tire reinforced framework material.

The steel cord of 3+9+15 × 0.225ST structure commonly used in the prior art has a diameter of 1.39mm, wherein the diameters of the core strand steel wire 1, the middle strand steel wire 5 and the outer strand steel wire 4 are all 0.225mm, the twisting directions of the core strand steel wire 1, the middle strand steel wire 5 and the outer strand steel wire 4 are all ZZZ twisting, the pitch of the core strand steel wire 1 is 6.3mm, the pitch of the middle strand steel wire 5 is 12.5mm, and the pitch of the outer strand steel wire 4 is 18.0mm, table 2 shows the performance indexes of the steel cord of 0.15+5 × 0.19+10 × 0.215+15 × 0.215ST structure provided in example 2 and the steel cord of 3+9+15 × 0.225ST structure commonly used in the prior art.

TABLE 2

As can be seen from table 2, the breaking force of the steel cord of example 2 is equal to or greater than 3510N, the breaking force/linear density is 416.8N/(mm), the adhesion is equal to or greater than 1300N/25mm, the breaking force of the steel cord of the prior art is equal to or greater than 3485N, the breaking force/linear density is 403.8N/(/ g/m), and the adhesion is equal to or greater than 1300N/25mm, which can be obtained by comparison, the steel cord of example 2 is made of steel wires of ultra-high strength, and the strength of the steel cord, the bleeding rate between the outer layer strand steel wires 4, and the fatigue resistance are improved by changing the diameter ratio of the monofilaments among the core strand steel wire 1, the second layer steel wire 2, the third layer steel wire 3, and the outer layer strand steel wires 4.

It can be seen from examples 1 and 2 that, when a radial tire having the same density is manufactured, the strength of the radial tire manufactured by using the steel cord of the present invention is improved by 3% as compared with the radial tire manufactured by using the steel cord of the prior art, the air content of the steel cord is small, and the fatigue resistance is greatly improved. The radial tire manufactured by the steel cord can reduce the production cost of the radial tire and prolong the service life of the radial tire.

According to different application occasions, the steel wires in the core strand steel wire 1, the second layer strand steel wire 2, the third layer strand steel wire 3 and the outer layer strand steel wire 4 of the steel cord with the structure of 1 xd 1+5 xd 2+10 xd 3+15 xd 4 provided by the invention are proportioned according to the steel wire diameter proportion range and different strengths, and the twisting direction can be divided into Z and S.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. An N-layer intensive reinforced steel cord characterized in that: including a core strand steel wire (1), five at least second floor strand steel wires (2), ten at least third floor strand steel wires (3) and fifteen at least outer strand steel wires (4), second floor strand steel wire (2) evenly distributed is in the periphery of core strand steel wire (1) to compile along core strand steel wire (1) and twist with fingers, third floor strand steel wire (3) evenly distributed is in the periphery of second floor strand steel wire (2) to compile along second floor strand steel wire (2) and twist with fingers, outer strand steel wire (4) evenly distributed is in the periphery of third floor strand steel wire (3) to compile and twist with fingers along third floor strand steel wire (3).

2. An N-ply dense reinforcement steel cord according to claim 1, characterized in that: the diameter of the core strand steel wire (1) is smaller than that of the second layer strand steel wire (2), the diameter of the second layer strand steel wire (2) is smaller than that of the third layer strand steel wire (3), and the diameter of the third layer strand steel wire (3) is smaller than or equal to that of the outer layer strand steel wire (4).

3. An N-ply dense reinforcement steel cord according to claim 2, characterized in that: the diameter of the core strand steel wire (1) is 0.12-0.20mm, the diameter of the second layer strand steel wire (2) is 0.17-0.25mm, and the diameter of the third layer strand steel wire (3) is 0.185-0.28 mm.

4. An N-ply dense reinforcement steel cord according to claim 1, characterized in that: the core strand steel wires (1) are not twisted, and the twisting directions of the second layer strand steel wires (2), the third layer strand steel wires (3) and the outer layer strand steel wires (4) are the same.

5. An N-ply dense reinforcement steel cord according to claim 1, characterized in that: the core strand steel wire (1) has no lay length, the second layer strand steel wire (2), the third layer strand steel wire (3) and the outer layer strand steel wire (4) have the same lay length, and the lay length is 12.5-25.0 mm.

6. An N-ply dense reinforcement steel cord according to claim 1, characterized in that: the cross section of the N layers of intensive reinforced steel wire cords is regular pentagon.