CN216274995U

CN216274995U - Open type high-strength steel cord

Info

Publication number: CN216274995U
Application number: CN202122692984.2U
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: 2021-11-04
Filing date: 2021-11-04
Publication date: 2022-04-12
Anticipated expiration: 2031-11-04

Abstract

The utility model relates to an open type high-strength steel cord, which comprises five monofilaments; the five monofilaments form alternately arranged contact parts and separation parts in a weaving and twisting mode of interval contact; the five monofilaments are held in line contact at the contact portion, and the five monofilaments leave a void at the separation portion. The steel cord of the utility model is characterized in that the five monofilaments form alternately arranged contact parts and separation parts in a weaving and twisting mode of spaced contact, the five monofilaments are in line contact at the contact parts, and gaps are left at the separation parts. Therefore, the monofilaments can move relatively in the calendering process, and the rubber can easily permeate into the steel cord from the gaps during rubber permeation.

Description

Open type high-strength steel cord

Technical Field

The utility model belongs to the field of steel cords, and particularly relates to an open type high-strength steel cord.

Background

Steel cords are an important component in radial tire carcass materials, and compact steel cords form a compact cross-sectional configuration by accommodating a large number of steel wires over a limited cross-section. However, the excessively compact structure may cause that rubber cannot permeate into the inside of the steel cord, so that the rubber coating rate of the steel cord is reduced, moisture is likely to permeate into the inner space of the steel cord, and the corrosion resistance of the steel cord is reduced.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: the monofilaments are alternately arranged in a contact part and a separation part in a weaving and twisting mode in contact at intervals, five monofilaments are kept in line contact at the contact part, and gaps are reserved at the separation part of the five monofilaments, so that the coating rate of the steel cord is improved.

The technical scheme adopted by the utility model for solving the technical problems is as follows: provided is an open type high strength steel cord comprising five monofilaments; the five monofilaments form alternately arranged contact parts and separation parts in a weaving and twisting mode of interval contact; the five monofilaments are kept in line contact at the contact part, and gaps are reserved at the separation part of the five monofilaments, wherein the gap M is more than or equal to 0.05mm and less than or equal to 0.08 mm.

Further, the five monofilaments are suitable for co-directional weaving and twisting.

Furthermore, the diameters of the five monofilaments are the same, and the diameter D is equal to or larger than 0.217mm and equal to or smaller than 0.233 mm.

Further, the geometric centers of the cross sections of the five monofilaments are suitable for being connected into a pentagon; the two sides of the pentagon are symmetrical.

Further, the pentagon at the contact part and the pentagon at the separation part are similar pentagons.

Furthermore, the vertex angle alpha of the pentagon is more than or equal to 60 degrees and less than or equal to 108 degrees.

The utility model has the beneficial effects that:

the steel cord of the utility model is characterized in that the five monofilaments form alternately arranged contact parts and separation parts in a weaving and twisting mode of spaced contact, the five monofilaments are in line contact at the contact parts, and gaps are left at the separation parts. Therefore, the monofilaments can move relatively in the calendering process, and the rubber can easily permeate into the steel cord from the gaps during rubber permeation. This results in a significant improvement in the adhesion between the steel cord and the rubber and in the coating rate of the steel cord.

Drawings

The utility model is further illustrated by the following figures and examples.

FIG. 1 is a schematic cross-sectional view of a split portion of a steel cord;

fig. 2 is a schematic cross-sectional view of the contact portion of the steel cord.

In the figure: steel cord 1, monofilament 11.

Detailed Description

The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.

Example 1

As shown in fig. 1, this example 1 provides an open type high strength steel cord 1, and the steel cord 1 of this example is a 5 × 0.225 structure, that is, five monofilaments 11 with the same diameter are twisted in the same twist direction and twist pitch, wherein the diameter of the monofilament 11 is 0.225mm, the twist direction is S direction, and the twist pitch is 9.5 mm.

The specific structure of the open type high strength steel cord 1 is as follows:

as shown in fig. 1 and 2, the steel cord 1 comprises five monofilaments 11, the monofilaments 11 form alternately arranged contact parts and separation parts in a spaced-contact weaving and twisting manner, the geometric centers of the cross sections of the five monofilaments woven and twisted into the steel cord are suitable for being connected into a bilaterally symmetrical pentagon, and the vertex angle of the pentagon is alpha. As shown in fig. 2, the five monofilaments 11 are kept in line contact at the contact portion, and in order to ensure that the five monofilaments are not deformed at the contact portion, the five monofilaments may be fastened at the contact portion by means of a ferrule, a snap, or the like. As shown in fig. 1, the five monofilaments 11 are provided with a gap at the separation part, wherein the gap is M; the monofilament 11 is made of steel wire with carbon content of 0.82% -0.85%, and the diameter of the monofilament 11 is D. In the weaving and twisting process, the length of the twist pitch is controlled to be smaller than the length of the monofilament in the twist pitch, so that the monofilament is provided with a gap at the separation part, the monofilament can move relatively in the rolling process, and further, when glue is infiltrated, glue can easily infiltrate into the steel cord from the gap.

The voids M, the diameter D and the apex angle α of the monofilament 11 satisfy the following relationship:

0.1mm≤M≤0.15mm；

0.217mm≤D≤0.233mm；

60°≤α≤108°。

comparative example 1

The steel cord of comparative example 1 was a 5x0.35 structure, i.e., it was made by braiding five monofilaments of the same diameter in the same twist direction and pitch, wherein the diameter of the monofilaments was 0.35mm, the twist direction was the S direction, and the pitch was 17.9 mm.

Comparative example 2

The steel cord of comparative example 1 was a double-layer structure of 3x0.2+6x 0.35; namely, the inner layer is formed by weaving and twisting 3 monofilaments with the same diameter in the same twisting direction and twisting distance, wherein the diameter of each monofilament is 0.2mm, the twisting direction is S direction, and the twisting distance is 10.5 mm; the outer layer is formed by weaving and twisting 6 monofilaments with the same diameter in the same twisting direction and twisting distance, wherein the diameter of each monofilament is 0.35mm, the twisting direction is Z direction, and the twisting distance is 18.9 mm.

Comparison of Performance

The steel cords fabricated with the parameters of example 1, comparative example 1 and comparative example 2 were selected for performance tests, wherein the test items include adhesion and coating rate, the judgment criteria of the coverage rate are shown in table 1, and the test results are shown in table 2.

The procedure for testing the adhesion and the coverage was as follows:

a) the testing degrees of the tensile machine are set as 100 mm/min;

b) the vulcanization drawing clamp is arranged on a lower clamp of a thousand-tension machine, the trimmed rubber block is placed into the vulcanization drawing clamp, a test sample is positioned at the center of a drawing hole with the diameter of 12.5mm, a bottom plate of the clamp is adjusted, and the minimum deformation of the test block in the drawing process is ensured;

c) adjusting the height of the upper clamp, placing the steel cord sample between two clamping pieces of the upper clamp, and clamping to ensure that the sample is vertical to the rubber block;

d) starting a tensile machine, extracting the samples from the rubber block one by one, and recording the maximum force required by extraction to be accurate to 1N;

e) the extracted sample surface was evaluated for the coating rate according to table 1. the coating rate was judged and recorded to an accuracy of 10%.

TABLE 1 evaluation criteria for coverage

TABLE 2 comparison of Performance tests

Item	Example 1	Comparative example 1	Comparative example 2
				Lay length/mm	9.5	17.9	10.5/18.9
Direction of twist	S	S	S/Z
				Diameter/mm of steel cord	0.62	0.95	1.19
Linear density/(g/m)	1.58	4.01	5.61
				Adhesive force/N	1250	600	1100
Gel coverage/%	90	75	75

In summary, in the present example 1, compared with the comparative examples 1 and 2, the diameter and the linear density of the steel cord are further reduced, thereby reducing the quality of the tire and realizing the lightweight of the tire; further, the steel cord produced using the present example 1 formed five monofilaments in a braid-twisting manner in spaced contact with alternately arranged contact portions and separation portions and five monofilaments held in line contact at the contact portions and five monofilaments left with voids at the separation portions, as compared to the steel cord produced using the prior art in comparative examples 1 and 2. Therefore, in the rolling process, the monofilaments can move relatively at the separation part, and further, when glue is infiltrated, glue can easily infiltrate into the steel cord from the gap, so that the adhesive force between the steel cord and rubber and the glue coverage rate of the steel cord are obviously improved, the corrosion of the steel cord caused by the fact that moist air enters the gap of the steel cord is avoided, the service life of the tire is prolonged, and the safety performance of the tire is improved.

In light of the foregoing description of preferred embodiments in accordance with the utility model, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. An open type high strength steel cord characterized in that: comprises five monofilaments; the five monofilaments form alternately arranged contact parts and separation parts in a weaving and twisting mode of interval contact; the five monofilaments are kept in line contact at the contact part, and gaps are reserved at the separation part of the five monofilaments, wherein the gap M is more than or equal to 0.05mm and less than or equal to 0.08 mm.

2. An open high strength steel cord according to claim 1, characterized in that: the five monofilaments are suitable for being woven and twisted in the same direction.

3. An open high strength steel cord according to claim 1, characterized in that: the diameters of the five monofilaments are the same, and the diameter D is more than or equal to 0.217mm and less than or equal to 0.233 mm.

4. An open high strength steel cord according to claim 1, characterized in that: the geometric centers of the cross sections of the five monofilaments are suitable for being connected into a pentagon; the two sides of the pentagon are symmetrical.

5. An open high strength steel cord according to claim 4, characterized in that: the pentagon located at the contact part and the pentagon located at the separation part are similar pentagons.

6. An open high strength steel cord according to claim 4, characterized in that: the vertex angle alpha of the pentagon is more than or equal to 60 degrees and less than or equal to 108 degrees.