CN110777463A

CN110777463A - Steel cord with 11 x 27 structure

Info

Publication number: CN110777463A
Application number: CN201911157853.5A
Authority: CN
Inventors: 马卫铭; 张正裕; 刘湘慧; 王燕; 曹恒祥; 潘振国
Original assignee: Jiangsu Xingda Steel Tyre Cord Co Ltd
Current assignee: Jiangsu Xingda Steel Tyre Cord Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-02-11

Abstract

The invention discloses a steel cord with an 11 x 27 structure, belonging to the technical field of steel cords. The steel cord is formed by twisting three strands of 3+9+15 Xd core strand steel wires and eight strands of 3+9+15 Xd outer strand steel wires, and the eight strands of outer strand steel wires are uniformly distributed around the three strands of core strand steel wires; the diameter of the core strand steel wire is the same as that of the outer strand steel wire, the twisting direction of the core strand steel wire and the twisting direction of the outer strand steel wire are the same, and the twisting distance of the core strand steel wire is 0.5 times of that of the outer strand steel wire; the cross section of the steel cord is circular. The steel cord with the 11 x 27 structure can be used as a steel cord for reinforcing a radial tire and a rubber hose of a engineering vehicle, and the gap between the outer layer strands is beneficial to the rubber to fully permeate into the steel wires of the core strands, so that the corrosion resistance, fatigue resistance, impact resistance and adhesion retention of the tire and the rubber hose are improved, and the service life of the tire and the rubber hose is prolonged.

Description

Steel cord with 11 x 27 structure

Technical Field

The invention belongs to the technical field of steel cord, and particularly relates to a steel cord with an 11 x 27 structure.

Background

The steel cord is an important component in a radial engineering tire framework material, is a steel cord with a 7 x (3 +9+15 × 0.245) +0.245 structure commonly used for a radial engineering tire, and is formed by weaving and twisting one strand of 3+9+15 × 0.245 core steel wire, six strands of 3+9+15 × 0.245 outer-layer steel wire and one 0.245mm outer winding wire, wherein the 3+9+15 × 0.245 twisting direction is ZZZ, the twisting pitch is 6.3/12.5/18.0mm, each layer of strands are arranged tightly, gaps among the outer-layer strand steel wires are small, and rubber cannot effectively permeate into the core steel wire, 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 a steel cord with an 11 x 27 structure, which aims to solve the technical problems that in the prior art, gaps between outer strands of the steel cord are small, rubber cannot effectively permeate into steel wires of a core strand, and the air content in the steel cord is high.

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

a steel cord with 11 x 27 structure is formed by three strands of core strand steel wires and eight strands of outer strand steel wires in a twisting mode, wherein the eight strands of outer strand steel wires are uniformly distributed around the three strands of core strand steel wires to form the steel cord with a circular section, each strand of core strand steel wire comprises a first layer formed by three steel wire monofilaments, a second layer formed by nine steel wire monofilaments and twisting the steel wire monofilaments around the steel wire monofilaments, and a third layer formed by fifteen steel wire monofilaments and twisting the steel wire monofilaments around the nine steel wire monofilaments, each strand of outer strand steel wire also comprises a first layer formed by three steel wire monofilaments, a second layer formed by nine steel wire monofilaments and twisting the steel wire monofilaments around the steel wire monofilaments, and a third layer formed by fifteen steel wire monofilaments and twisting the steel wire monofilaments around the nine steel wire monofilaments, wherein the diameters and the twisting directions of the steel wire monofilaments in the core strand steel wires and the outer strand steel wires are the same, the twisting pitch of the first layer steel wire monofilaments in the core strand steel wires is the same as the twisting pitch of the first layer, the lay length of a second layer of steel wire monofilaments in the core strand steel wire is the same as that of a second layer of steel wire monofilaments in the outer layer strand steel wire, and the lay length of a third layer of steel wire monofilaments in the core strand steel wire is the same as that of a third layer of steel wire monofilaments in the outer layer strand steel wire; the twisting directions of the core strand steel wires and the outer layer strand steel wires are the same, and the twisting distance of the core strand steel wires is 0.5 times of that of the outer layer strand steel wires.

Furthermore, the twisting directions of the core strand steel wires and the outer layer strand steel wires are S-twisted, and the twisting directions of the first layer steel wire monofilaments, the second layer steel wire monofilaments and the third layer steel wire monofilaments in the core strand steel wires and the outer layer strand steel wires are Z-twisted.

Furthermore, the twisting directions of the core strand steel wires and the outer layer strand steel wires are Z-twisting, and the twisting directions of the first layer steel wire monofilaments, the second layer steel wire monofilaments and the third layer steel wire monofilaments in the core strand steel wires and the outer layer strand steel wires are S-twisting.

Furthermore, the lay length of the outer layer strand steel wires in the twisting process is 40.0-60.0 mm.

Furthermore, the twisting pitch of the steel wires of the core strand is 25.0mm, and the twisting pitch of the steel wires of the outer layer strand is 50.0 mm.

Furthermore, the diameter of the steel wire monofilament in the core strand steel wire and the outer layer strand steel wire is 0.165-0.38 mm.

Further, the diameter of the steel filament in the core strand steel filament and the outer strand steel filament is 0.245 mm.

Furthermore, the twisting pitch of the first layer of steel wire filaments in the core strand steel wires and the outer layer strand steel wires is 6.3mm, the twisting pitch of the second layer of steel wire filaments is 12.5mm, and the twisting pitch of the third layer of steel wire filaments is 18.0 mm.

Further, the diameter of each of the core strand steel wires and the outer layer strand steel wires is 1.5 mm.

Further, the strength grade of the core strand steel wire and the outer layer strand steel wire is any one of a normal strength NT, a high strength HT, an ultra-high strength ST, an ultra-high strength UT, and an ultra-high strength MT.

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

(1) according to the steel cord with the 11 x 27 structure, the gaps among the outer strand steel wires are large, so that rubber can be fully infiltrated into the core strand steel wires, point contact friction among the steel wires at each layer due to insufficient infiltration of rubber is avoided, and the problem that the bearing capacity of the steel cord is failed due to abrasion is further avoided;

(2) the steel cord with the 11 x 27 structure can be used as a steel cord for reinforcing a radial tire and a rubber hose of a engineering vehicle, improves the corrosion resistance, fatigue resistance, impact resistance and adhesion retention of the tire and the rubber hose, and prolongs the service life of the tire and the rubber hose.

Drawings

FIG. 1 is a schematic cross-sectional view of a steel cord of an 11X 27 structure provided in an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a 7 x (3 +9+15 x d) + d1 structural steel cord commonly used in the prior art;

in the figure: 1. 4 core strand steel wire; 2.5 outer layer strand steel wire; 6, winding steel wires outside; d1, d 1' first layer of steel filaments; d2, d 2' second layer of steel filaments; d3, d 3' third layer of steel filaments.

Detailed Description

The invention is further described with reference to specific examples. 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.

It should be noted that in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. As used in the description of the present invention, the terms "front," "back," "left," "right," "up," "down" and "in" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

As shown in figure 1, the steel cord with the 11 multiplied by 27 structure can be used for reinforcing radial tires and rubber hoses of engineering vehicles, and is formed by weaving and twisting three strands of 3+9+15 multiplied by d core strand steel wires 1 and eight strands of 3+9+15 multiplied by d outer strand steel wires 2, the section of the steel cord is circular, and the eight strands of outer strand steel wires 2 are woven and twisted around the core strand steel wires 1 to form a structure that the eight strands of outer strand steel wires 2 are uniformly distributed around the three strands of core strand steel wires 1. The core strand steel wire 1 and the outer layer strand steel wire 2 are respectively formed by weaving and twisting three first layer steel wire monofilaments d1, nine second layer steel wire monofilaments d2 and fifteen third layer steel wire monofilaments d3, the nine second layer steel wire monofilaments d2 are woven and twisted around the three steel wire monofilaments, and the fifteen third layer steel wire monofilaments d3 are woven and twisted around the nine second layer steel wire monofilaments d 2. The diameters of all layers of steel wire monofilaments in the core strand steel wire 1 and the outer layer strand steel wire 2 are the same, and the diameter range of the selected steel wire monofilaments is 0.165-0.38 mm. The twisting directions of the steel wire monofilaments in each layer of the core strand steel wire 1 and the outer layer strand steel wire 2 are the same. The lay length of the first layer steel wire filament d1 in the core strand steel wire 1 is the same as the lay length of the first layer steel wire filament d1 in the outer layer strand steel wire 2, the lay length of the second layer steel wire filament d2 in the core strand steel wire 1 is the same as the lay length of the second layer steel wire filament d2 in the outer layer strand steel wire 2, and the lay length of the third layer steel wire filament d3 in the core strand steel wire 1 is the same as the lay length of the third layer steel wire filament d3 in the outer layer strand steel wire 2. The invention overcomes the defects caused by unreasonable structural design of the steel cord by changing the structure of the steel cord, improves the rubber permeation performance, the shock resistance and the fatigue resistance of the steel cord, reduces the air content between the steel cord strands for the tire or the rubber hose, and improves the strength grade of the tire or the rubber hose cord. The twisting directions of the core strand steel wire 1 and the outer layer strand steel wire 2 are the same; the twisting pitch of the core strand steel wire 1 is 0.5 times of the twisting pitch of the outer strand steel wire 2, so that the contact area between the steel wires of all layers is increased, the point contact friction between the steel wires of all layers of the steel wire cord is reduced, the problem of failure of the bearing capacity of the cord due to point contact abrasion of the steel wires of all layers in the use process of the engineering radial tire or the rubber hose is avoided, the rubber seepage performance, the corrosion resistance, the fatigue resistance, the impact resistance and the adhesion retention of the engineering radial tire or the rubber hose are improved, and the service life of the tire or the rubber hose is prolonged.

The strength grades of the core strand steel wire 1 and the outer layer strand steel wire 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.

The first embodiment is as follows:

in the embodiment, the diameters of the steel wire monofilaments of each layer selected from the core strand steel wire 1 and the outer layer strand steel wire 2 are both 0.245 mm. The twisting pitch of the first layer steel wire monofilament d1 in the core strand steel wire 1 and the outer layer steel wire 2 is 6.3mm, the twisting pitch of the second layer steel wire monofilament d2 is 12.5mm, and the twisting pitch of the third layer steel wire monofilament d3 is 18.0 mm. The twisting pitch of the core strand steel wires 1 is 0.5 times of the twisting pitch of the outer layer strand steel wires 2. The core strand steel wire 1 and the outer layer strand steel wire 2 adopt the same twisting direction, and are S-twisted. The present embodiment (3 + 8) steel cord structure is used for an engineering vehicle radial tire and a rubber hose reinforcing steel cord.

Table 1 is a table comparing the performance indexes of 7 × (3 +9+15 × 0.245) +0.245HT structural steel cords commonly used in radial tires in the prior art with those of the first embodiment of the present invention:

TABLE 1

FIG. 2 is a schematic cross-sectional view of a 7 x (3 +9+15 x d) + d1 structural steel cord commonly used in the prior art, in combination with FIGS. 1 and 2, table 1 shows that the diameter of a 7 × (3 +9+15 × 0.245) +0.245HT structural steel cord is 4.84mm, each layer of steel filaments in the core strand steel wires 4 and each layer of steel filaments in the outer layer strand steel wires 5 are ZZZ twisted, the outer layer strand steel wires 5 are S twisted, the twist direction of the outer-wound steel wires 6 is Z twisted, the lay length of the first layer of steel filaments d1 ' in the core strand steel wires 4 and the outer layer of strand steel wires 5 is 6.3mm, the lay length of the second layer of steel filaments d2 ' is 12.5mm, the lay length of the third layer of steel filaments d3 ' is 18.0mm, the lay length of the outer layer of steel wires 5 is 55.0mm, the lay length of the outer-wound steel wires 6 is 5.0mm, the breaking force is 22385N or more, the cord diameter is 4.84mm, the breaking force/cord diameter is 4625N/(mm) or more, 2600N/25 mm; the diameter of the steel cord of the first embodiment of the invention is 6.0mm, each layer of steel wire monofilament in the core strand steel wire 1 and the outer layer strand steel wire 2 is ZZZ twisted, the core strand steel wire 1 and the outer layer strand steel wire 2 are S twisted, the lay length of the core strand steel wire 1 is 25.0mm, the lay length of the outer layer strand steel wire 2 is 50.0mm, the breaking force is not less than 31000N, the breaking force/cord diameter is 5166.6N/(mm), and the adhesive force is not less than 4800N/25 mm; compared with the prior art, the steel wire cord of the embodiment of the invention adopts the steel wire strands with the same strength grade, and the strength, the glue permeation rate and the fatigue resistance of the steel wire cord are improved by increasing the number of the strands.

Example two:

the diameters of the steel wire monofilaments of each layer selected from the core strand steel wire 1 and the outer layer strand steel wire 2 in the embodiment are both 0.175 mm. The twisting pitch of the first layer steel wire monofilament d1 in the core strand steel wire 1 and the outer layer steel wire 2 is 5.0mm, the twisting pitch of the second layer steel wire monofilament d2 is 10.0mm, and the twisting pitch of the third layer steel wire monofilament d3 is 16.0 mm. The twisting pitch of the core strand steel wires 1 is 0.5 times of the twisting pitch of the outer layer strand steel wires 2. The core strand steel wire 1 and the outer layer strand steel wire 2 adopt the same twisting direction, and are S-twisted. This example (3 + 8) steel cord structure is used for engineering radial tires and rubber hose steel cords.

Table 2 is a table comparing the performance indexes of 7 × (3 +9+15 × 0.22) +0.20HT structural steel cords commonly used in radial tires of the related art with example two of the present invention:

TABLE 2

FIG. 2 is a schematic cross-sectional view of a 7 x (3 +9+15 × d + d1 structural steel cord commonly used in the prior art, and as can be seen from FIG. 1, FIG. 2, Table 2, the diameter of the 7 x (3 +9+15 × 0.22) +0.20HT structural steel cord is 4.35mm, each layer of steel filaments in the core strand steel 4 is SSS twist, each layer of steel filaments in the outer layer strand steel 5 is ZZZ twist, the outer layer strand steel 5 is S twist, the lay direction of the outer winding steel wire 6 is Z twist, the lay length of the first layer of steel filaments d1 in the core strand steel 4 and the outer layer of steel filaments is 6.3mm, the lay length of the second layer of steel filaments d2 'is 12.5mm, the lay length of the third layer of steel filaments d 3' is 18.0mm, the lay length of the outer strand steel wire 5 is 48.0mm, the lay length of the outer winding steel wire 6 is 5.0mm, the breaking force is not less than 174.35 mm, and the breaking force N4127.6 mm/(N25 mm) diameter of the cord is 4/25 mm/(N4127.6 mm), the adhesive force is more than or equal to 2600N/25 mm; the diameter of the steel cord of the second embodiment of the invention is 4.20mm, each layer of steel wire monofilament in the core strand steel wire 1 and the outer layer strand steel wire 2 is ZZZ twisted, the core strand steel wire 1 and the outer layer strand steel wire 2 are S twisted, the lay length of the core strand steel wire 1 is 23.0mm, the lay length of the outer layer strand steel wire 2 is 46.0mm, the breaking force is not less than 17300N, the breaking force/cord diameter is 4119N/(mm), and the adhesive force is not less than 3200N/25 mm; compared with the two, the second embodiment of the invention adopts the steel wire strands with the same strength grade and monofilament diameter, and improves the strength, the glue permeation rate and the fatigue resistance of the steel wire cord by increasing the number of the strands.

As can be seen from the comparison, when radial tires with the same density are manufactured, the strength of the radial tire manufactured by the invention is equal to that of the radial tire manufactured by the prior art, but the rubber permeation 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 the rubber hose of the engineering vehicle and prolong the service life of the radial tire and the rubber hose of the engineering vehicle.

The embodiments of the present invention are merely exemplary. According to different applications, the steel filaments in the core steel wire 1 and the steel filaments in the outer strand steel wire 2 can be proportioned by other diameters, and the twist direction is ZZZ/S/S or SSS/Z/Z.

The present invention has been disclosed in terms of the preferred embodiment, but is not intended to be limited to the embodiment, and all technical solutions obtained by substituting or converting equivalents thereof fall within the scope of the present invention.

Claims

1. A steel cord with 11 x 27 structure is characterized in that the steel cord is formed by weaving and twisting three strands of core strand steel wires and eight strands of outer strand steel wires, the eight strands of outer strand steel wires are uniformly distributed around the three strands of core strand steel wires to form the steel cord with a circular section, each strand of core strand steel wires comprises a first layer consisting of three steel wire monofilaments, a second layer formed by weaving and twisting nine steel wire monofilaments around the steel wire monofilaments and a third layer formed by weaving and twisting fifteen steel wire monofilaments around the nine steel wire monofilaments, each strand of outer strand steel wires also comprises a first layer consisting of three steel wire monofilaments, a second layer formed by weaving and twisting nine steel wire monofilaments around the steel wire monofilaments and a third layer formed by weaving and twisting fifteen steel wire monofilaments around the nine steel wire monofilaments, wherein the diameters and the twisting directions of the steel wire monofilaments in the core strand steel wires are the same, the twisting pitch of the first layer steel wire monofilaments in the core strand steel wires is the same as the twisting pitch of the first layer steel wire monofilaments in the outer strand steel wires, the lay length of a second layer of steel wire monofilaments in the core strand steel wire is the same as that of a second layer of steel wire monofilaments in the outer layer strand steel wire, and the lay length of a third layer of steel wire monofilaments in the core strand steel wire is the same as that of a third layer of steel wire monofilaments in the outer layer strand steel wire; the twisting directions of the core strand steel wires and the outer layer strand steel wires are the same, and the twisting distance of the core strand steel wires is 0.5 times of that of the outer layer strand steel wires.

2. A steel cord of 11 x 27 structure as claimed in claim 1, wherein said core strand steel wires and said outer strand steel wires are each S-twisted, and said core strand steel wires and said outer strand steel wires are each Z-twisted in the twisting direction of the first, second and third layers of steel filaments.

3. A steel cord of 11 x 27 structure as claimed in claim 1, wherein said core strand steel wires and said outer strand steel wires are Z-twisted in both directions, and said core strand steel wires and said outer strand steel wires are S-twisted in both directions of the filaments of the first, second and third layers.

4. A steel cord of 11 x 27 structure as claimed in claim 1, wherein said outer layer strand wires are twisted with a lay length of 40.0 to 60.0 mm.

5. A steel cord of 11 x 27 structure as claimed in claim 1, wherein said core strand steel wires are twisted at a pitch of 25.0mm, and said outer layer strand steel wires are twisted at a pitch of 50.0 mm.

6. A steel cord of 11 x 27 structure as claimed in claim 1, wherein the diameter of the steel filament in said core strand steel filament and said outer strand steel filament is 0.165 to 0.38 mm.

7. A steel cord of 11 x 27 structure as claimed in claim 1, characterized in that the diameter of the steel filaments in said core strand steel filaments and outer strand steel filaments is 0.245 mm.

8. A steel cord of 11 x 27 structure as claimed in claim 2, wherein said core strand steel wires and said outer strand steel wires have a first layer of steel filaments twisted with a pitch of 6.3mm, a second layer of steel filaments twisted with a pitch of 12.5mm, and a third layer of steel filaments twisted with a pitch of 18.0 mm.

9. A steel cord of 11 x 27 structure as claimed in claim 1, characterized in that said core strand steel filaments and said outer layer strand steel filaments are each 1.5mm in diameter.

10. A steel cord of 11 x 27 structure, according to claim 1, characterized in that said core strand steel filaments and outer layer strand steel filaments have strength grades of any one of normal strength NT, high strength HT, ultra high strength ST, ultra high strength UT and ultra high strength MT.