CN218893895U

CN218893895U - Structural steel cord structure with ultrahigh strength and good glue permeability

Info

Publication number: CN218893895U
Application number: CN202223164478.7U
Authority: CN
Inventors: 姚凤刚; 钱国平; 陈亮; 严华
Original assignee: Zhangjiagang City Junma Steel Cord Co ltd
Current assignee: Zhangjiagang City Junma Steel Cord Co ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-04-21
Anticipated expiration: 2032-11-28

Abstract

The utility model provides a double-layer steel cord structure with ultrahigh strength and good glue permeation performance, which comprises at least one steel cord bundle, wherein the steel cord bundle comprises a central core wire and six outer layer monofilaments which are mutually twisted in the same direction, an open gap is formed between every two adjacent outer layer monofilaments, and a glue permeation gap is formed between the central core wire and each outer layer monofilament; defining the diameter of the circumcircle of the central core wire as D1, and the diameter of the outer layer monofilament as D2, wherein the ratio of D1 to D2 is 1.05-1.2; the central core wire is prefabricated and drawn into an equilateral hexagon structure, six outer monofilaments are distributed on the periphery of the central core wire, gaps are reserved among the outer monofilaments, the central core wire and adjacent outer monofilaments, rubber can be fully infiltrated and embedded to the periphery of the central core wire and the periphery of each outer monofilament, so that the structural strength of a steel cord bundle after being molded is high, breaking force and structural strength are improved, and meanwhile the section diameter and the overall weight of the cord structure are reduced.

Description

Structural steel cord structure with ultrahigh strength and good glue permeability

Technical Field

The utility model relates to the technical field of steel cords, in particular to a structural steel cord structure with ultrahigh strength and good glue permeability.

Background

Steel cords are widely used in rubber tire products, and are generally prepared by winding a plurality of steel wires with different diameters in the same twisting direction and with the same twisting pitch, and are main framework materials of tires.

The traditional steel cord has a large cross section and can accommodate a plurality of monofilaments, but because the inner layer steel wires and the outer layer steel wires of the cord are in close contact and have no clearance, the rubber seepage performance is poor when the steel cord is vulcanized by adding rubber, and the consumption of the steel cord is relatively large under the condition of ensuring certain strength of the tire, so that the weight and rolling resistance of the tire can be increased, the oil consumption is increased, and the energy conservation and the environmental protection are not enough.

In the conventional cord structure, for example, a cord with a structure of 0.365+6×0.35, since the core wire steel wire is not deformed, one core wire is easy to pierce out in the tire rolling process, so that the fatigue performance of the cord is poor, and the service life of the tire is reduced.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a double-layer steel cord structure with ultrahigh strength and good glue permeability, which comprises at least one steel cord bundle, wherein the steel cord bundle comprises a central core wire and six outer layer monofilaments twisted in the same direction, the section of the central core wire is in an equilateral hexagon, and the six outer layer monofilaments are stranded outside the central core wire in a central symmetry manner;

wherein an open gap is formed between two adjacent outer monofilaments, and a glue seepage gap is formed between the central core wire and the outer monofilaments;

defining the diameter of the circumcircle of the central core wire as D1, and the diameter of the outer layer monofilament as D2, wherein the ratio of D1 to D2 is 1.05-1.2.

Further, the diameters of the six outer filaments are the same, and the diameter of the outer filaments is smaller than the diameter of the central core wire.

Further, the diameter of the circumcircle of the central core wire is 0.20-0.40 mm.

Further, the diameter of the outer layer monofilament is 0.15-0.38 mm.

Further, the lay length of the steel cord bundle is 14mm-17mm.

Further, the twisting direction of the outer layer monofilament is the S direction.

Further, the central core wire and the outer layer monofilaments are both made of steel wires with carbon content of 0.81%.

Further, the tensile strength of the central core wire is 3100-3300 MPa, and the tensile strength of the outer layer monofilament is 3600-3800 MPa.

Compared with the prior art, the structural steel cord structure with the ultra-high strength and good glue permeability has the remarkable advantages that:

1. the central core wire is prefabricated and drawn into an equilateral hexagon structure, six outer monofilaments are distributed on the periphery of the central core wire, gaps are reserved among the outer monofilaments, the central core wire and the adjacent outer monofilaments, so that rubber can be fully infiltrated and embedded into the periphery of the central core wire and the periphery of each outer monofilament, the rubber permeability is good, the steel cord bundle is compact in structure and high in structural strength after being molded, and the steel cord bundle is used in a tire belt layer and has good anti-corrosion performance after being used for making tires;

2. the diameter ratio between the central core wire and the outer layer monofilament is in the range of 1.05-1.2, the steel cord bundle structure with the 1+6 structure formed by the central core wire and the outer layer monofilament in the diameter ratio range has high strength and good glue seepage performance, and the sectional diameter and the whole weight of the cord structure are reduced while the breaking force and the structural strength are improved, so that the steel cord bundle structure is used as a supporting framework in a tire product, the weight of the tire can be reduced, the rolling resistance of the tire is further reduced, and the oil consumption is reduced.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the utility model will now be described, by way of example, with reference to the accompanying drawings.

FIG. 1 is a schematic cross-sectional view of a double layer steel cord structure according to an embodiment of the present utility model.

Fig. 2 is a schematic cross-sectional view of a central core and a single outer monofilament in accordance with an embodiment of the present utility model.

Detailed Description

For a better understanding of the technical content of the present utility model, specific examples are set forth below, along with the accompanying drawings.

The utility model discloses a double-layer steel cord structure, which aims to solve the problem that in the prior art, an outer layer steel wire and an inner layer steel wire are tightly combined without gaps, so that the adhesive permeability is poor, and the fatigue resistance of a steel cord finished product is affected. According to the utility model, by increasing the gap between the steel cord core wire and the outer layer monofilament, the steel cord has good permeability during twisting, so that the tire has good corrosion resistance.

For the 1+6 structural cord with a specific common structure, the strength of the outer layer steel wire ranges from 2870 MPa to 2900MPa in the production process, and the strength of one core wire steel wire ranges from 2800 MPa to 2850MPa.

Referring to fig. 1, the present application proposes a double-layer steel cord structure mainly used as a carcass material in a tire belt, comprising a steel cord bundle 100 having a 1+6 structure formed by intertwining one central core wire 10 with six outer filaments 20.

Six outer monofilaments 20 are symmetrically stranded around the outer circumference of the central core 10.

Further, the central core wire 10 is drawn and deformed by a drawing machine into a central core wire 10 having an equilateral hexagonal structure in cross section, and six outer filaments 20 are centrosymmetrically stranded outside the central core wire 10 and twisted with each other in the same direction as S, specifically, the S direction defaults to the left direction.

Specifically, the central core wire 10 and the outer layer monofilament 20 are both made of steel wires with carbon content of 0.81%, and optionally, the central core wire 10 and the outer layer monofilament 20 may be made of galvanized steel wires.

Further, the diameter of the circumcircle of the central core wire 10 is 0.20-0.40 mm, the diameter of the outer layer monofilament 20 is 0.15-0.38 mm, the circumcircle diameter of the central core wire 10 is defined as D1, the diameter of the outer layer monofilament 20 is D2, and optionally, the ratio of D1/D2 is 1.05-1.2.

Further, in order to improve the adhesive permeability of the cord structure, as shown in fig. 1, an open gap 101 is provided between any two adjacent outer filaments 20, and an adhesive-permeable gap 102 is provided between each outer filament 20 and the central core wire 10.

The size of the open gap 101 and the glue-penetrating gap 102 depends on the diameters of the central core wire 10 and the outer layer filaments 20.

Specifically, when the outer layer monofilament 20 is wound around the central core wire 10, a certain gap is formed between the outer layer monofilament 20 and the central core wire 10 and between adjacent outer layer monofilaments 20 through the opening gap 101 and the glue seepage gap 102, so that when the steel cord is vulcanized by adding rubber, glue can fully infiltrate between the outer layer monofilament 20 and the central core wire 10 from the gap, and full penetration of glue is realized.

In a specific embodiment, as shown in fig. 2, gaps exist between each outer circular monofilament 20 of the steel cord and between each outer circular monofilament 20 and the central core wire 10, so that rubber can fully infiltrate and embed to the periphery of the central core wire 10 and the periphery of each outer circular monofilament 20 through the gaps (an open gap 101 and a rubber seepage gap 102) during vulcanization, the rubber coating rate reaches more than 95%, and the rubber infiltration performance is greatly improved.

In summary, since the cord structure of 1+6 described above allows rubber to sufficiently permeate into the pores between each outer layer monofilament 20 and the central core wire 10 of the steel cord, rubber is tightly coated around each outer layer monofilament 20 and between the central core wire 10, and the dense structure formed by coating rubber can effectively prevent intrusion of moisture, thereby improving the corrosion resistance of the cord.

Specifically, the tensile strength of the central core wire 10 in the 1+6 cord structure provided by the application can reach 3100-3300 MPa, and the tensile strength of the outer layer monofilament 20 can reach 3600-3800 MPa, compared with the tensile strength of the 1+6 cord with the common structure in the prior art, the tensile strength of the outer layer monofilament is obviously improved.

It should be understood that, because the central core wire 10 is deformed by drawing and forms tight connection with the outer layer monofilament 20 through the infiltrated rubber, when the tire belt is used in a tire belt, compared with the central core wire 10 with a circular cross section, the central core wire 10 with an equilateral hexagonal cross section provided in the embodiment is not easy to have core wire piercing in the use process, therefore, the tire product prepared by adopting the 1+6 cord structure provided in the embodiment can improve the fatigue resistance of the tire.

The following table 1 shows the comparison of parameters of the steel cord bundle 100 according to the embodiment of the present utility model.

TABLE 1 structural parameter comparison of Steel cord bundles

	Steel cord (300)	Prior art 0.365+6 x 0.35
			Core diameter (mm)	0.37	0.365
Diameter of monofilament (mm)	0.32	0.35
			Cord diameter (mm)	1.02	1.08
Linear density (g/m)	4.71	5.42
			Steel cord lay length (mm)	16	18
Direction of twist	S	S
			Drawing the core wire by special dies	Is that	Whether or not
Breaking force (N)	1890	1865

Specifically, as shown in the above table, when the diameter of the central core wire 10 is 0.37mm, the diameter of the outer layer monofilament 20 is 0.32mm, and both are twisted with a 16mm lay length S to form a steel cord bundle 100 with a diameter of 1.02mm, the obtained steel cord bundle 100 has a linear density of 4.71g/m and a breaking force of 1890N, and compared with the steel cord bundle formed by twisting a core wire with a diameter of 0.365mm and a monofilament diameter of 0.35mm with a S lay length of 18mm in the prior art, the steel cord bundle not only reduces the whole diameter of the bundle and reduces the weight, but also improves the strength of the bundle.

In combination with the above embodiment, the steel cord bundle 100 proposed in the present application includes a central core wire 10 and six outer filaments 20 stranded on the outer side of the central core wire 10 in a central symmetry, the central core wire 10 is preformed and deformed into an equilateral hexagonal section by a drawing machine, and twisted with the outer filaments 20 distributed on the periphery thereof in the S-direction to form the steel cord bundle 100, and by setting the diameter ratio between the central core wire 10 and the outer filaments 20 to be 1.05-1.2, an open gap 101 and a rubber permeation gap 102 are formed between the central core wire 10 and the outer filaments 20, so that when the steel cord bundle 100 is vulcanized in rubber, the rubber can be fully permeated and embedded to the periphery of the central core wire 10 and the periphery of each outer filament 20, so that the steel cord bundle 100 has a compact structure and high structural strength after being formed.

It should be understood that the diameter ratio between the central core wire 10 and the outer layer monofilament 20 is set to be 1.05-1.2, the steel cord bundle 100 structure of the 1+6 structure formed by the central core wire 10 and the outer layer monofilament 20 within the diameter ratio range has high strength and good adhesive permeability, and the section diameter and the whole weight of the cord structure are reduced under the condition of improving breaking force and structural strength, and the steel cord bundle 100 provided by the application is applied to a tire belt layer to serve as a framework material, so that the manufactured tire product has good corrosion resistance, high strength, light weight, small rolling resistance, low oil consumption, energy conservation and environmental protection, and the steel cord bundle 100 used by the tire product under the same strength has less consumable materials and low cost.

While the utility model has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present utility model. Accordingly, the scope of the utility model is defined by the appended claims.

Claims

1. The structural steel cord structure with the ultra-high strength and good glue permeability is characterized by comprising at least one steel cord bundle (100), wherein the steel cord bundle (100) comprises six outer monofilaments (20) of a central core wire (10) twisted in the same direction, the cross section of the central core wire (10) is in an equilateral hexagon, and the six outer monofilaments (20) are stranded outside the central core wire (10) in a central symmetry manner;

wherein an open gap (101) is formed between two adjacent outer layer monofilaments (20), and a glue seepage gap (102) is formed between the central core wire (10) and the outer layer monofilaments (20); the diameter of the circumcircle of the central core wire (10) is defined as D1, the diameter of the outer layer monofilament (20) is defined as D2, and the ratio of D1/D2 is 1.05-1.2.

2. The structural steel cord structure with ultra-high strength and good glue permeability according to claim 1, characterized in that the six outer filaments (20) have the same diameter and the diameter of the outer filaments (20) is smaller than the diameter of the central core wire (10).

3. The structural steel cord structure with ultrahigh strength and good glue permeability according to claim 2, wherein the diameter of the circumcircle of the central core wire (10) is 0.20-0.40 mm.

4. The structural steel cord structure with ultra-high strength and good glue permeability according to claim 3, wherein the diameter of the outer layer monofilament (20) is 0.15-0.38 mm.

5. The structural steel cord structure with ultra-high strength and good glue permeability according to claim 2, characterized in that the lay length of the steel cord bundle (100) is 14-17 mm.

6. The structural steel cord structure with ultra-high strength and good glue permeability according to claim 1, characterized in that the twisting direction of the outer layer filaments (20) is S-direction.

7. The structural steel cord structure with ultra-high strength and good glue permeation according to claim 1, wherein the tensile strength of the central core wire (10) is 3100-3300 mpa, and the tensile strength of the outer layer monofilaments (20) is 25 3600-3800 mpa.