CN209975022U

CN209975022U - High-rubber-permeability radial steel wire cord

Info

Publication number: CN209975022U
Application number: CN201821847360.5U
Authority: CN
Inventors: 王爱萍; 马卫明; 潘春东; 曹恒祥; 潘正国
Original assignee: Jiangsu Xingda Steel Tyre Cord Co Ltd
Current assignee: Jiangsu Xingda Steel Tyre Cord Co Ltd
Priority date: 2018-11-10
Filing date: 2018-11-10
Publication date: 2020-01-21
Anticipated expiration: 2028-11-10

Abstract

The utility model provides a high-permeability radial steel wire cord, which comprises a steel cord core and a steel cord outer layer, wherein the steel cord core comprises 3 core strand steel wires, and the 3 core strand steel wires are piled, folded and twisted in a triangular shape along the same direction; the outer layer of steel cord includes 8 outer strand steel wires, 8 outer strand steel wire centers on the steel cord sinle silk is circular evenly arranges to be compiled and twists with fingers. The steel cord production adopts the external-release and internal-contraction stranding machine type, a monofilament deformation device is additionally arranged at an inlet of a first twist, the outer layer strand steel wires are fully deformed by the monofilament deformation device in the first twisting process until the outer layer of the steel cord is uniformly arranged, and the gap between every two adjacent first layer steel wires is 0.035-0.08 mm. The utility model discloses a to steel cord's structural change, promote radial tire with 3+8 series structure steel cord's infiltration performance, improve curtain cloth intensity level and rubber to the anchoring effect of core strand steel wire, prevent that the tire from becoming invalid because of steel cord and rubber bonding in the use.

Description

High-rubber-permeability radial steel wire cord

Technical Field

The utility model relates to a steel cord especially relates to a high glue permeability performance meridian steel cord.

Background

The steel tire cord includes a carcass steel cord and a belt steel cord. Steel tire cords are generally made by twisting a strand of filaments of the same diameter. The number of filaments and the structure of the cord are different depending on the tire specifications and the use location. The steel wire cord is mainly used for a carcass layer and a belt layer of an all-steel radial tire and a belt layer of a fiber radial tire.

At present, the core strand of the 3+9 multiplied by 0.22 structure commonly used by the steel cord for the radial ply tire is three steel wires and has the same diameter with nine steel wires of the outer cladding, the core strand is 0.5 times of the lay length of the outer cladding, the lay directions of the inner and outer layers are the same, the arrangement between the inner and outer layers is tighter, the clearance between each layer is smaller, and the rubber can not effectively permeate the steel wires of the core strand.

The structure of the steel cord, 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 by controlling the production process of the steel cord. Therefore, a steel cord with high rubber permeability of a 3+8 series structure steel cord for a radial tire is needed, the strength grade of the cord is improved, the anchoring effect of rubber on core strand steel wires is improved, and the bonding failure of the steel cord and the rubber in the use process of the tire is prevented. The steel cord of (1).

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a high-permeability radial steel cord.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a high-permeability rubber performance radial steel cord comprises a steel cord core and a steel cord outer layer, wherein the steel cord outer layer is wrapped outside the steel cord core;

the steel curtain wire core comprises 3 core strand steel wires, and the 3 core strand steel wires are triangularly woven and twisted along the same direction; the outer layer of the steel cord comprises 8 outer layer strand steel wires, and the 8 outer layer strand steel wires are circularly and uniformly distributed and twisted around the core of the steel cord; the diameter range of the core strand steel wire and the outer layer strand steel wire is 0.175mm-0.40mm, the gap between two adjacent outer layer strand steel wires is 0.035mm-0.08mm, the strength of the core strand steel wire is different from that of the outer layer strand steel wire, the lay length of the outer layer strand steel wire is 2 times of that of the core strand steel wire, and the lay length range of the outer layer strand steel wire is 10.0mm-20.0 mm; the section of the steel cord is circular;

the steel cord is a steel cord with an improved manufacturing process, and the manufacturing process comprises the following steps: optimizing a heat treatment electroplating process, reducing wet drawing passes, adopting an external-release and internal-contraction stranding machine type and adding a monofilament deformation device at an inlet of a first twist; and the outer layer strand steel wires are fully deformed by the monofilament deformation device in the first twisting process until the outer layer of the steel cord is uniformly arranged.

Preferably, the direction of twist of the steel filaments of the core strand is the same as the direction of twist of the steel filaments of the outer layer strand.

Preferably, the direction of twist of the core strand steel wires and the direction of twist of the outer strand steel wires comprise S/S twist or Z/Z twist.

Preferably, the diameter of the core strand steel wires and the diameter of the outer layer strand steel wires are the same, and the diameter is 0.22 mm.

Preferably, the strength grade of the core strand steel filaments and the outer layer strand steel filaments is in the range of NT-UT.

Preferably, the gap between two adjacent steel wires of the outer layer strand ranges from 0.04mm to 0.06 mm.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a to steel cord's structural change, promote radial tire with 3+8 series structure steel cord's infiltration performance, improve curtain cloth intensity level and rubber to the anchoring effect of core strand steel wire, prevent that the tire from becoming invalid because of steel cord and rubber bonding in the use. The utility model discloses a reduce outer thigh steel wire root and increase lay length and reduce the weight of steel cord, use the raw and other materials of same material, optimize thermal treatment electroplating process and improve copper-plated wire tensile strength steadily, increase partial compression ratio through reducing wet drawing way and improve monofilament intensity, adopt and put adduction strander type outward, increase monofilament deformation device in first entry of twisting with fingers, it is even to the outer thigh range of cord fully to make outer thigh monofilament, make remaining torsion poker performance more tend to one to, this structure is the same with 3+ 9X 0.22HT diameter, the cord intensity of equal density improves 2%, the cord cost reduction 8% when equal intensity of preparation tire cord.

Drawings

FIG. 1 is a schematic cross-sectional structure view of a 3+ 8X 0.22ST structural steel cord;

fig. 2 is a schematic cross-sectional structure of a 3+9 × 0.22HT structural steel cord.

Detailed Description

In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.

Referring to fig. 1 and fig. 2, the present invention provides a high-permeability radial steel cord, which includes a steel cord core 1 and a steel cord outer layer 2, wherein the steel cord outer layer 2 is wrapped outside the steel cord core 1.

The steel curtain wire core 1 comprises 3 core strand steel wires 11, and the 3 core strand steel wires 11 are triangularly woven and twisted along the same direction; the outer layer 2 of steel cord includes 8 outer strand steel wires 21, and 8 outer strand steel wires 21 are circular evenly arranging around steel cord sinle silk 1 and are compiled and twist with fingers. The diameter range of the core strand steel wire 11 and the outer layer strand steel wire 21 is 0.175mm-0.40mm, the gap between two adjacent outer layer strand steel wires 21 is 0.035mm-0.08mm, the strength of the core strand steel wire 11 is different from that of the outer layer strand steel wire 21, the lay length of the outer layer strand steel wire 21 is 2 times that of the core strand steel wire 11, and the lay length range of the outer layer strand steel wire 21 is 10.0mm-20.0 mm; the cross section of the steel cord is circular.

The diameters of the eleven strands of 3+8 multiplied by 0.22ST steel wire cords are the same as the diameters of the eleven strands of 3+9 multiplied by 0.22HT steel wire cords, the weight of the steel wire cords is reduced by reducing the number of outer strand steel wires 21, and meanwhile, gaps among the outer strand steel wires 21 are increased, so that the eleven strands of steel wire cords are beneficial to the permeation of rubber, provide channels for the flowing of the rubber during the vulcanization of the tire, and increase the anchoring effect of the rubber on the core strands; the diameter of the steel wire is smaller, the bending load, the flexibility and the fatigue resistance of the steel cord are correspondingly improved, but the cost of the cord is reduced by 8 percent when the tire is manufactured at the same density. The strength of the core strand steel wire is different from that of the outer layer strand steel wire, and the strength of the steel wire cord can be improved after the core strand steel wire and the outer layer strand steel wire are twisted. The lay length of the outer layer strand steel wire 21 is 2 times of the lay length of the core strand steel wire 11, so that the outer layer strand steel wire 21 can be guaranteed to be woven and twisted around the core strand steel wire 11, and the outer layer strand steel wire is smoothly woven and twisted into a cord steel wire. The lay length range of the outer layer strand steel wire 21 is 10.0mm-20.0mm, the lay length is too large, the torsion deformation degree of the single wire of the cord thread in the twisting process is smaller, the elastic restoring force is larger, if the elastic restoring force is eliminated, the fatigue resistance of the steel cord thread is reduced, and the service life is shortened; if the lay length is too small, the loss of strength in the lay length is large, and the productivity is also lowered.

The steel cord is a steel cord with an improved manufacturing process, and the manufacturing process comprises the following steps: optimizing a heat treatment electroplating process, reducing wet drawing passes, adopting an external-release and internal-contraction stranding machine type and adding a monofilament deformation device at an inlet of a first twist; the heat treatment process is optimized, so that the tensile strength of the plated copper wire can be improved; the total number of wet drawing is reduced, and partial compression ratio can be increased, so that the strength of the monofilament is improved; an outward-releasing inward-closing stranding machine type is adopted, the paying-off spool is placed outside the rotating body, and the number and the capacity of the paying-off spool are not limited; the outer layer strand steel wires 21 are fully deformed to the outer layer 2 of the steel cord in the first twisting process through the monofilament deformation device, so that the arrangement is uniform, the performance of the residual twisted steel bars is more consistent, and the steel wires are changed into wavy steel wires from straight steel wires after passing through the monofilament deformation device. In another embodiment, the method of integral deformation of the monofilaments is adopted in the first twisting process, so that the problems of uneven deformation of the monofilaments, easy loose of the cord threads and high straightness are effectively solved, and the product quality and the yield are improved. The effect of deformer is the deformation rate of increase outer strand steel wire, strengthens the bending rigidity of cord through outer strand steel wire deformation rate, reduces the resilience force of cord at the tire shaping in-process, improves the fatigue resistance ability of cord, is convenient for increase the cord lay length, prevents that its structure end cloth is loose, improves the cohesion with rubber.

Preferably, the direction of twist of the core strand steel wires 11 is the same as the direction of twist of the outer strand steel wires 21, so that the core strand steel wires 11 and the outer strand steel wires 21 are in line contact and are less prone to wear. Further, the direction of twist of the core strand steel wires 11 and the direction of twist of the outer layer strand steel wires 21 include S/S twist or Z/Z twist.

In one embodiment, the diameter of the core strand steel wires 11 is the same as the diameter of the outer layer strand steel wires 21, and the diameter is 0.22mm, which is a preferred diameter that can be increased in the bending load, flexibility and fatigue resistance of the steel wire.

Preferably, the strength grades of the core strand steel filaments 11 and the outer layer strand steel filaments 21 range from NT-UT, i.e. from ordinary strength to very high strength steel filaments can be applied.

Preferably, the range of the gap L between two adjacent outer strand steel wires 21 is 0.04mm-0.06mm, preferably 0.05mm, which is convenient for rubber permeation, provides a channel for rubber flow during tire vulcanization, increases the anchoring effect of rubber on the core strand, fully fills rubber and wraps between each layer of steel wires, reduces the air content between each layer of steel wires of the tire cord for the tire body, prevents the failure of the bearing capacity of the tire cord caused by strength and steel wire abrasion in the using process of the tire, improves the bonding retention of the tire, the comprehensive performance of fatigue resistance, corrosion resistance and impact resistance, prolongs the service life of the tire, can reduce the weight of the tire cord under the condition of ensuring the strength of the tire, and has the advantages of light weight of the tire, low heat generation, low oil consumption, resource saving and production cost.

In a preferred embodiment, the eleven strands of the steel cord have three core strands 11, and eight outer strands 21 are twisted around the core strand, and the directions of the core strands 11 and the outer strands 21 are S-twisted. In this embodiment, the diameter of each of the core strand steel wires 11 and the outer layer strand steel wires 21 is 0.22mm, the lay length of the core strand steel wires 11 is 7.0mm, and the lay length of the outer layer strand steel wires 21 is 14.0 mm. The clearance between the eleven strands of steel wire cords with the 3+8 multiplied by 0.22 structure is about 0.05mm, thereby facilitating rubber permeation, increasing the anchoring effect of rubber on the core strands and prolonging the service life of the tire.

The utility model discloses the structure is the same with the diameter of 3+9 structure, and intensity is equivalent, but the cost reduction of cord when making the tire at equal density 8%, and the result of contrast through the hypertonic rubber energy noon wire cord of modified 3+ 8X 0.22ST and the wire cord of 3+ 9X 0.22HT is shown as table 1:

from top to the above, the utility model discloses a to steel cord's structural change, promote radial tire with 3+8 series structure steel cord's oozing gluey performance, improve curtain cloth intensity level and rubber to the anchoring effect of core strand steel wire, prevent that the tire from inefficacy because of steel cord and rubber bonding in the use. The utility model discloses a reduce outer thigh steel wire radical, improve copper facing silk tensile strength, it increases partial compression ratio and improves monofilament strength to reduce wet drawing total track, adopt and put adduction stranding model outward, increase monofilament deformation device at first entrance of twisting with the fingers, it is even to arrange to the outer thigh of cord fully to make outer thigh monofilament, the remaining logical strip performance of twisting with the fingers more tends to one to, this structure is the same with 3+9 diameter, intensity is identical, the cost of making the tire cord when equal density descends 8%.

The present invention has been described in relation to the above embodiments, which are only examples for implementing the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, all changes and modifications which do not depart from the spirit and scope of the present invention are deemed to fall within the scope of the present invention.

Claims

1. A kind of high rubber permeability performance meridian steel cord, characterized by that: the steel cord outer layer is wrapped outside the steel cord core;

the steel curtain wire core comprises 3 core strand steel wires, and the 3 core strand steel wires are triangularly woven and twisted along the same direction; the outer layer of the steel cord comprises 8 outer layer strand steel wires, and the 8 outer layer strand steel wires are circularly and uniformly distributed and twisted around the core of the steel cord; all outer layer strand steel wires on the outer layer of the steel cord are integrally deformed and uniformly arranged through a first twisted monofilament deformation device, and the outer layer strand steel wires are wavy steel wires after passing through the monofilament deformation device; the diameter range of the core strand steel wire and the outer layer strand steel wire is 0.175mm-0.40mm, the gap between two adjacent outer layer strand steel wires is 0.035mm-0.08mm, the strength of the core strand steel wire is different from that of the outer layer strand steel wire, the lay length of the outer layer strand steel wire is 2 times of that of the core strand steel wire, and the lay length range of the outer layer strand steel wire is 10.0mm-20.0 mm; the cross section of the steel cord is circular.

2. A high spelt performance radial steel cord according to claim 1, characterized in that: the twisting direction of the steel wires of the core strand is the same as that of the steel wires of the outer layer strand.

3. A high spelt performance radial steel cord according to claim 2, characterized in that: the twisting direction of the steel wires of the core strand and the twisting direction of the steel wires of the outer layer strand comprise S/S twisting or Z/Z twisting.

4. A high spelt performance radial steel cord according to claim 1, characterized in that: the diameter of the core strand steel wire is the same as that of the outer layer strand steel wire, and the diameter of the core strand steel wire is 0.22 mm.

5. A high spelt performance radial steel cord according to claim 1, characterized in that: the strength grade range of the steel wires of the core strand and the steel wires of the outer layer strand is NT-UT.

6. A high spelt performance radial steel cord according to claim 1, characterized in that: the range of the gap between two adjacent outer strand steel wires is 0.04mm-0.06 mm.