CN112359623A

CN112359623A - Steel wire cord for improving glue layer infiltration

Info

Publication number: CN112359623A
Application number: CN202011288093.4A
Authority: CN
Inventors: 马卫铭; 冯国兵; 王燕; 曹恒祥; 刘湘慧
Original assignee: Jiangsu Xingda Steel Tyre Cord Co Ltd
Current assignee: Jiangsu Xingda Steel Tyre Cord Co Ltd
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2021-02-12

Abstract

The invention discloses a steel cord for improving the infiltration of an adhesive layer, which comprises core strand steel wires, middle strand steel wires and outer strand steel wires, wherein the core strand steel wires comprise at least three strands of core strand first layer steel wires, at least nine strands of middle strand second layer steel wires and at least fifteen strands of outer layer third layer steel wires which are woven and twisted. The gap between fifteen strands of outer-layer strand steel wires and the gap between nine strands of middle-layer strand steel wires are larger, so that rubber can fully permeate into the core strand steel wires, point contact friction between each layer of steel wires due to insufficient permeation of the rubber into a channel is avoided, and the problem that the bearing capacity of a steel cord is invalid due to abrasion is further avoided.

Description

Steel wire cord for improving glue layer infiltration

Technical Field

The invention relates to a steel cord for improving the infiltration of an adhesive layer, belonging to the technical field of steel cords.

Background

The steel cord is an important component in a framework material of a radial tire, the steel cord with a 3+9+15 x d structure commonly used for the radial tire is formed by weaving and twisting core strand steel wires, middle layer strand steel wires and outer layer strand steel wires, the diameters of the steel wires in the core strand steel wires, the middle layer strand steel wires and the outer layer strands are the same, the twist direction of the (3 +9+ 15) x d1 structure is ZZZ, the twist pitch is 5.0/10.0/16.0mm or 6.3/12.5/18.0mm, the arrangement of the outer layer strand steel wires is compact, gaps among the steel wires are small, and rubber cannot effectively permeate into the middle layer strand steel wires so that the air content in the cord is high.

In the use process of the radial tire, the problem of cord thread bearing capacity failure caused by insufficient strength of the steel cord thread or corrosion and abrasion of the steel wire is easy to occur, the structure of the steel cord thread, the strength, the bending rigidity and the adhesive property with rubber 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 thread.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides a steel cord for improving the permeation of an adhesive layer, and solves the defects that the strength of the steel cord is insufficient, the gaps between outer strands are small, and rubber cannot effectively permeate steel wires of a core strand, so that the air content in the cord is high.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the steel wire cord for improving the infiltration of the glue layer is characterized by comprising core strand steel wires, middle strand steel wires and outer strand steel wires, wherein the core strand steel wires are formed by weaving and twisting at least three strands of core strand first layer steel wires, at least nine strands of middle strand second layer steel wires and at least fifteen strands of outer layer steel wires which are arranged layer by layer from inside to outside;

the middle layer strand steel wire is arranged on the periphery of the core strand steel wire along the circumferential direction, and the outer layer strand steel wire is arranged on the periphery of the middle layer strand steel wire along the circumferential direction;

the first layer of steel wire diameter of first layer steel wire is greater than the second layer of steel wire diameter of intermediate level thigh second layer steel wire, second layer of steel wire diameter is greater than the third layer of steel wire diameter of outer layer thigh third layer steel wire.

Furthermore, the diameter range of the first layer of steel wires is 0.19-0.26 mm, the diameter range of the second layer of steel wires is 0.18-0.25 mm, and the diameter range of the third layer of steel wires is 0.17-0.24 mm.

Further, the diameter of the first layer of steel wires is larger than that of the second layer of steel wires by 0.01mm, and the diameter of the second layer of steel wires is larger than that of the third layer of steel wires by 0.01 mm.

Further, the twisting direction of the steel wires of the core strand is the same as that of the steel wires of the middle layer strand and that of the steel wires of the outer layer strand.

Furthermore, the lay length of the third layer of steel wires of the outer layer strands is 1.333-1.50 times of that of the second layer of steel wires of the middle layer strands, and the lay lengths of the first layer of steel wires of the core strands and the third layer of steel wires of the outer layer strands are equal.

Further, the lay length of the first layer of steel wires of the core strand is larger than that of the second layer of steel wires of the middle layer strand.

Further, the third layer of steel wire gaps L1 between the steel wires of the outer layer strands is larger than 0.025mm, and the second layer of steel wire gaps L2 between the steel wires of the middle layer strands is larger than 0.022 mm.

Further, the strength grades of the first layer steel wires of the core strands, the second layer steel wires of the middle layer strands and the third layer steel wires of the outer layer strands are any one of common strength NT, high strength HT, ultrahigh strength ST, ultrahigh strength UT or ultrahigh strength MT.

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

(1) the fifteen strands of outer strand steel wires are arranged, so that gaps are enlarged, rubber can be favorably and fully infiltrated into the core strand steel wires, point contact friction among the steel wires of all layers due to insufficient infiltration of the rubber is avoided, and the problem that the bearing capacity of a steel cord is invalid due to abrasion is further avoided;

(2) the invention arranges the third layer of steel wire gap at least 0.025mm and the second layer of steel wire gap at least 0.022mm, can improve the corrosion resistance, fatigue resistance, shock resistance and adhesion retention of the tire, and improve the service life of the tire.

Drawings

FIG. 1 is a schematic cross-sectional view of a steel cord for enhancing bondline penetration according to an embodiment of the present invention;

FIG. 2 is a cross-sectional schematic view of a steel cord of the prior art;

in fig. 1: 1. a core strand first layer of steel filaments; 2. a second layer of steel wires of the middle layer strand, 3 and a third layer of steel wires of the outer layer strand; 10. core strand steel wire; 20. middle layer strand steel wire; 30. outer layer strand steel wires; d1, first layer wire diameter; d2, second layer steel wire diameter; d3, third layer steel wire diameter; d4, steel wire diameter, L1 and third layer steel wire gap; l2, second layer wire gap.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

As shown in fig. 1, a cross-sectional view of a steel cord having a high-permeability rubber layer structure according to an embodiment of the present invention is a 3 xd 1+9 xd 2+15 xd 3 steel cord, table 1 shows data parameters of examples 1-8 of the steel cord having a high-permeability rubber layer structure according to the present invention, the steel cord has a circular cross-section, the steel cord is formed by twisting a core strand consisting of three strands of a first steel wire 1, a middle layer strand consisting of nine strands of a second steel wire 2, and an outer layer strand consisting of fifteen strands of a second steel wire 2, and a third layer steel wire 3, the middle layer strand consisting of nine strands of a second steel wire 2, and the core strand consisting of three strands of a first steel wire 1, and the outer layer strand consisting of fifteen strands of a third layer steel wire 3, and the middle layer strand consisting of nine strands of a second steel wire 2, respectively. Wherein, the diameter range of the first layer of steel wires 1 is 0.19-0.26 mm, the diameter range of the second layer of steel wires 2 is 0.18-0.25 mm, the diameter range of the third layer of steel wires 3 is 0.17-0.24 mm, and the twisting directions of the core strand steel wires 10 and the steel wires in the middle layer strand steel wires 20 and the outer layer strand steel wires 30 are the same.

The invention forms a structure of the high-permeability rubber steel cord with at least 0.025mm of outer layer steel wire clearance, namely third layer steel wire clearance L1, and at least 0.022mm of middle layer steel wire clearance, namely second layer steel wire clearance L2.

The invention overcomes the defects caused by unreasonable structural design of the steel cord by changing the diameter ratio of the monofilaments among all layers of the steel cord, improves the strength, the glue permeation performance, 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 embodiment of the present invention, the strength grades of the steel wires in the core strand steel wire 10 and the intermediate layer strand steel wire 20 and the outer layer strand steel wire 30 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 ordinary strength NT, high strength HT, ultrahigh strength ST, ultrahigh strength UT or ultrahigh strength MT and any strength grade, 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.

TABLE 1

The first embodiment is as follows:

in this example, a 3 × 0.255+9 × 0.245+15 × 0.235ST structural steel cord was used for the radial tire reinforcing frame material. The diameter d1 of the first layer of steel wires in the core strand steel wires 10 in the structural steel cord is at least 0.01mm larger than the diameter d2 of the steel wires in the middle layer strand 20, the diameter d2 of the second layer of steel wires in the middle layer strand steel wires 20 is at least 0.01mm larger than the diameter d3 of the third layer of steel wires in the outer layer strand steel wires 30, the diameter of the first layer of steel wires 1 in the core strand in the steel cord is 0.255mm, and the diameter of the second layer of steel wires 2 in the middle layer is 0.245 mm. The diameter of the outer layer third layer steel wire 3 is 0.235mm, the twist pitch of the core strand first layer steel wire 1 is 18.0mm, the twist pitch of the middle layer second layer steel wire 2 is 12.5mm, the twist pitch of the outer layer third layer steel wire 3 is 18.0mm, the core strand steel wire 10 and the middle layer strand steel wire 20 and the outer layer strand steel wire 30 adopt the same twist direction, the twist direction is Z twist, the clearance between the middle layer strand steel wires 20, namely the second layer steel wire clearance L2 is 0.027mm, and the clearance between the outer layer strand steel wires 30, namely the third layer steel wire clearance L1 is 0.030 mm.

Fig. 2 is a schematic cross-sectional view of a steel cord in the prior art, which is a schematic cross-sectional view of a 3+9+15 × 0.245HT structural steel cord, the diameter of the 3+9+15 × 0.245HT structural steel cord is 1.51mm, the diameters of a core strand steel wire 10, a middle strand steel wire 20 and an outer strand steel wire 30 are both 0.245mm, the diameters of a core strand first layer steel wire 1, a middle strand second layer steel wire 2 and an outer strand third layer steel wire 3 are all ZZZ twisted, the lay length of the core strand first layer steel wire 1 is 6.3mm, the lay length of the middle strand second layer steel wire 2 is 12.5mm, and the lay length of the outer strand third layer steel wire 3 is 18.0 mm.

Table 2 is a table comparing the performance indexes of the 3+9+15 × 0.245HT structural steel cord commonly used in radial tires in the prior art with the 3 × 0.255+9 × 0.245+15 × 0.235ST structural steel cord of the embodiment of the present invention:

TABLE 2

As can be seen from FIG. 2 and Table 2, the breaking force of the steel cord of 3+9+ 15X 0.245HT structure is equal to or greater than 3730N, the breaking force/linear density is 363.5N/(g/m), the adhesive force is equal to or greater than 1600N/25mm,

the diameter of the steel cord of the first embodiment in fig. 1 of the invention is 1.51mm, the diameters of the core strand steel wires 10 are all 0.255mm, the diameters of the middle layer strand steel wires 20 are all 0.245mm, the diameters of the outer layer strand steel wires 30 are all 0.235, the diameters of the core strand steel wires 1, the middle layer strand steel wires 20 and the outer layer strand steel wires 30 are all ZZZ twists, the lay lengths of the core strand steel wires 10 are all 18.0mm, the lay lengths of the middle layer strand steel wires 20 are all 12.5mm, the lay lengths of the outer layer strand steel wires 30 are all 18.0mm, the gap between the middle layer strand steel wires 20, namely the second layer steel wire gap L2 is 0.027mm, the gap between the outer layer strand steel wires 30, namely the third layer steel wire gap L1 is 0.03mm, the breaking force is not less than 0N, the breaking force/linear density is 396.7N/(. Compared with the core strand, the middle layer strand and the outer layer strand, the steel wire with the ultrahigh strength grade is adopted in the first embodiment of the invention, and the strength, the glue permeation rate and the fatigue resistance of the cord are improved through the diameter ratio of the single wires of the core strand, the middle layer strand and the outer layer strand.

Example two:

in this example, 3 × 0.235+9 × 0.225+15 × 0.215ST structural steel cords were used for the radial tire reinforcing frame material. In this embodiment, the diameter of a steel wire d1 in the core strand 10 is at least 0.01mm larger than the diameter of a steel wire d2 in the middle layer strand 20, the diameter of a steel wire d2 in the middle layer strand 20 is at least 0.01mm larger than the diameter of a steel wire d3 in the outer layer strand 30, the diameter of a first layer steel wire 1 in the steel cord is 0.235mm, the diameter of a second layer steel wire 2 in the middle layer is 0.225mm, the diameter of a third layer steel wire 3 in the outer layer strand is 0.215mm, the twisting pitch of the first layer steel wire 1 is 18.0mm, the twisting pitch of the second layer steel wire 2 is 12.5mm, the twisting pitch of the third layer steel wire 3 is 18.0mm, the core strand steel wire 1, the middle layer strand steel wire 2 and the outer layer steel wire 3 adopt the same twisting direction, the twisting direction is Z twisting, the L2 gap between the middle layer steel wires is 0.026mm, and the L1 gap.

The 3+9+ 15X 0.225ST structure steel cord is the steel cord among the prior art, its steel cord's diameter is 1.39mm, core strand steel wire 1 is 0.225mm with intermediate level thigh steel wire 2 and outer layer thigh steel wire 3 diameter, core strand steel wire 10, intermediate level thigh steel wire 20, outer layer thigh steel wire 30 is ZZZ twists with fingers, the lay length of core strand steel wire 10 is 6.3mm, the lay length of intermediate level thigh steel wire 20 is 12.5mm, the lay length of outer layer thigh steel wire 30 is 18.0 mm.

Table 3 is a table comparing the performance indexes of the 3+9+15 × 0.225ST structural steel cord commonly used in the radial tire in the prior art and the two 3 × 0.235+9 × 0.225+15 × 0.215ST structural steel cords of the example of the present invention:

TABLE 3

As can be seen from FIG. 2 and Table 3, the steel cord having a 3+9+ 15X 0.225ST structure had a breaking force of 3485N or more, a breaking force/linear density of 403.8N/(g/m), and an adhesive force of 1300N/25mm or more. In the embodiment of the invention shown in figure 1, the diameter of the second steel wire cord is 1.39mm, the diameters of the core strand steel wires 10 are all 0.235mm, the diameters of the middle layer strand steel wires 20 are all 0.225mm, the diameters of the outer layer strand steel wires 30 are all 0.215mm, the diameters of the core strand steel wires 10, the middle layer strand steel wires 20 and the outer layer strand steel wires 30 are all ZZZ twisted, the lay lengths of the core strand steel wires 10 are all 18.0mm, the lay lengths of the middle layer strand steel wires 20 are all 12.5mm, the lay lengths of the outer layer strand steel wires 30 are all 18.0mm, the gap between the middle layer strand steel wires 20, namely the second layer steel wire gap L2 is 0.026mm, the gap between the outer layer strand steel wires 30, namely the third layer steel wire gap L1 is 0.029mm, the breaking force is not less than 3500N, the breaking force/linear density is. In the second embodiment of the invention, the steel wire with ultrahigh strength grade is adopted, and the strength, the glue permeation rate and the fatigue resistance of the cord are improved through the diameter ratio of the single wires of the core strand, the middle layer strand and the outer layer strand.

Example three:

in this example, 3 × 0.205+9 × 0.195+15 × 0.185UT structural steel cords were used for the radial tire reinforcing frame material. In this embodiment, the diameter of the steel wire d1 in the core strand 10 is at least 0.01mm larger than the diameter of the steel wire d2 in the intermediate layer strand 20, the diameter of the steel wire d2 in the intermediate layer strand 20 is at least 0.01mm larger than the diameter of the steel wire d3 in the outer layer strand 30, the diameter of the first layer steel wire 1 in the steel cord is 0.205mm, the diameter of the second layer steel wire 2 in the intermediate layer is 0.195mm, the diameter of the third layer steel wire 3 in the outer layer strand is 0.185mm, the lay length of the first layer steel wire 1 is 16.0mm, the lay length of the second layer steel wire 2 is 12.0mm, the lay length of the third layer steel wire 3 is 16.0mm, the core strand steel wire 1, the intermediate layer strand steel wire 2 and the outer layer steel wire 3 adopt the same lay direction, the lay direction is Z lay, the L2 gap between the intermediate layer steel wires is 0.023mm, the L1 gap between,

The 3+9+ 15X 0.20ST structure steel cord is the steel cord among the prior art, its steel cord's diameter is 1.22mm, core strand steel wire 1 is 0.20mm with intermediate level thigh steel wire 2 and outer layer thigh steel wire 3 diameters, core strand steel wire 10, intermediate level thigh steel wire 20, outer layer thigh steel wire 30 is ZZZ twists with fingers, the lay length of core strand steel wire 10 is 6.3mm, the lay length of intermediate level thigh steel wire 20 is 12.5mm, the lay length of outer layer thigh steel wire 30 is 15.0 mm.

Table 4 is a table comparing the performance indexes of the 3+9+15 × 0.20ST structural steel cord commonly used in radial tires of the prior art and the three 3 × 0.205+9 × 0.195+15 × 0.185UT structural steel cord of the example of the present invention:

TABLE 4

As can be seen from FIG. 2 and Table 4, the steel cord having a 3+9+ 15X 0.225ST structure had a breaking force of 3485N or more, a breaking force/linear density of 403.8N/(/ g/m), and an adhesive force of 500N/12.5mm or more. In the embodiment of the invention shown in FIG. 1, the diameter of the three steel wire cord is 1.20mm, the diameters of the core strand steel wires 10 are all 0.205mm, the diameters of the middle layer strand steel wires 20 are all 0.195mm, the diameters of the outer layer strand steel wires 30 are all 0.185mm, the diameters of the core strand steel wires 10, the middle layer strand steel wires 20 and the outer layer strand steel wires 30 are all ZZZ twists, the lay lengths of the core strand steel wires 10 are all 16.0mm, the lay lengths of the middle layer strand steel wires 20 are all 12.0mm, the lay lengths of the outer layer strand steel wires 30 are all 16.0mm, the gap between the middle layer strand steel wires 20, namely the second layer steel wire gap L2 is 0.023mm, the gap between the outer layer strand steel wires 30, namely the third layer steel wire gap L1 is 0.027mm, the breaking force is not less than 2850N, the breaking force/linear density is 63. In the third embodiment of the invention, the steel wire with ultrahigh strength grade is adopted, and the strength, the glue permeation rate and the fatigue resistance of the cord are improved through the diameter ratio of the single wires of the core strand, the middle layer strand and the outer layer strand.

As can be seen from the comparison, when the radial tire with the same density is manufactured, the strength of the radial tire manufactured by the embodiment of the invention is improved by 5 percent compared with the strength of the radial tire manufactured by the prior art, and the rubber leakage performance and the fatigue resistance performance of the cord are greatly improved. The invention can effectively reduce the production cost of the radial tire and prolong the service life of the radial tire of the engineering vehicle.

The embodiments of the present invention are merely exemplary and can be modified in accordance with different applications. In the 3 xd 1+9 xd 2+15 xd 3 structure of the present invention, the steel wires in the core strand steel wires 10, the steel wires in the middle layer strand steel wires 20 and the steel wires in the outer layer strand steel wires 30 are proportioned according to the steel wire diameter ratio range and different strength, and the twisting direction can be divided into ZZZ and SSS or ZZS and SSZ.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The steel cord for improving the rubber layer infiltration is characterized by comprising core strand steel wires (10), middle layer strand steel wires (20) and outer layer strand steel wires (30), wherein the core strand steel wires (10) are formed by weaving and twisting at least three core strand first layer steel wires (1), at least nine middle layer strand second layer steel wires (2) and at least fifteen outer layer strand third layer steel wires (3) which are arranged layer by layer from inside to outside;

the middle layer strand steel wire (20) is arranged on the periphery of the core strand steel wire (10) along the circumferential direction, and the outer layer strand steel wire (30) is arranged on the periphery of the middle layer strand steel wire (20) along the circumferential direction;

the first layer steel wire diameter (d 1) of the first layer steel wire (1) is larger than the second layer steel wire diameter (d 2) of the second layer steel wire (2) of the middle layer strand, and the second layer steel wire diameter (d 2) is larger than the third layer steel wire diameter (d 3) of the third layer steel wire (3) of the outer layer strand.

2. A steel cord for improving glue line penetration as claimed in claim 1, wherein said first layer of steel filaments has a diameter (d 1) ranging from 0.19 to 0.26mm, said second layer of steel filaments has a diameter (d 2) ranging from 0.18 to 0.25mm, and said third layer of steel filaments has a diameter (d 3) ranging from 0.17 to 0.24 mm.

3. A steel cord for improving glue line penetration as claimed in claim 2, characterized in that said first layer steel wire diameter (d 1) is greater than 0.01mm compared to the second layer steel wire diameter (d 2), said second layer steel wire diameter (d 2) is greater than 0.01mm compared to the third layer steel wire diameter (d 3).

4. A steel cord for improving bondline penetration as claimed in claim 1, characterized in that said core strand steel filaments (10) have the same twist direction as the middle layer strand steel filaments (20) and the outer layer strand steel filaments (30).

5. A steel cord for improving bondline penetration as claimed in claim 1, wherein said outer strand third layer of steel filaments (3) has a lay length 1.333 to 1.50 times the lay length of the middle strand second layer of steel filaments (2), said core strand first layer of steel filaments (1) has a lay length equal to that of the outer strand third layer of steel filaments (3).

6. A steel cord for improving bondline penetration according to claim 1, characterized in that the third layer of steel wire interstices (L1) between said outer layer strand of steel wires (30) is larger than 0.025mm and the second layer of steel wire interstices (L2) between said middle layer of strand of steel wires (20) is larger than 0.022 mm.

7. A steel cord for improving bondline penetration according to claim 1, characterized in that said core strand first layer steel filaments (1), intermediate layer strand second layer steel filaments (2) and outer layer strand third layer steel filaments (3) have a strength grade of any one of normal strength NT, high strength HT, ultra high strength ST, ultra high strength UT or ultra high strength MT.