Steel cord with elliptical steel wire for 1 + N structure

Abstract

The utility model discloses a steel cord with elliptical steel wires for a 1 + N structure, the steel cord comprises a core strand monofilament and an outer steel wire with the number of N, the core strand monofilament adopts elliptical phase change, the diameter detection of the central steel wire needs to select the diameters of the long axis and the short axis of the ellipse to calculate the mean value, and the ratio of the long axis to the short axis is in the range of 1.1-2.0. Compared with the prior art, the steel cord disclosed by the utility model solves the problems of rubber permeation, layer torsion and center steel wire stabbing of the steel cord, and is widely applied to a tire body layer and a belted layer of a tire.

Description

Technical Field

[0001] The utility model relates to the technical field of steel cords, in particular to a steel cord having an elliptical steel wire used for a 1+N structure. Background Art

[0002] As the primary tire reinforcement material, steel cord possesses excellent tensile strength, corrosion resistance, and fatigue resistance, and exhibits excellent adhesion to rubber. Of particular importance is adhesive penetration, which characterizes the degree to which the rubber penetrates the cord. Greater penetration results in stronger adhesion. Furthermore, rubber penetration into the gaps in the steel cord effectively reduces friction between the steel wires, thereby improving their durability and ultimately extending their service life. Therefore, steel cord manufacturers desire steel cords with improved adhesive penetration.

[0003] Currently, the center wire of the 1+6 steel cord structure on the market is mostly round, with some using flat wire. The round center wire structure is not conducive to adhesive penetration, and the outer wires lack sufficient binding force on the center wire. This insufficient adhesive penetration significantly impacts the adhesion between the cord and the rubber, and thus affects tire safety. Insufficient binding force between the outer wires and the center round wire can cause the cord to detach from the center wire, leading to tire punctures and significantly impacting the safety of the cord. Furthermore, insufficient binding force can cause layer torsion during tire production, preventing fully automated production and increasing production costs. Furthermore, while flat wire solves the problems of adhesive penetration and layer torsion, the increased wear and tear of the single-filament flat wire leads to significant damage to the wire, significant tooling wear, and high costs. While cord fatigue is reduced, there is still a risk of wire breakage during production. Utility Model Content

[0004] The utility model aims to provide an elliptical steel wire for a steel cord with a 1+N structure, which solves the problems of glue seepage, layer twisting, central steel wire piercing, and fatigue wire breakage in the steel cord.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An elliptical steel wire is used for a steel cord with a 1+N structure. The steel cord includes a core single wire and an outer layer of steel wires with N wires. The core single wire adopts an elliptical deformation. The diameter detection of the central steel wire requires selecting the major axis and minor axis diameters of the ellipse to calculate the mean value. The ratio of the major axis to the minor axis is within the range of 1.1 to 2.0. Any segment of the deformed cross section is an arc, and there is no intersection point between the arc and the straight line segment.

[0007] A further improvement of the present invention is that the steel cord can be extended to any one of the existing 1+N structure steel cords, where the value of N is between 5 and 10, preferably, N is 5, 6 or 7.

[0008] A further improvement of the present invention is that the diameter of the core strand is larger than the diameter of the single outer layer steel wire.

[0009] A further improvement of the present invention is that the outer steel wire and the core strand monofilament are both made of carbon steel.

[0010] A further improvement of the present invention is that the lay pitch of the steel cord is within the range of 10 to 22 mm.

[0011] Beneficial effects of the utility model:

[0012] The elliptical steel wire of the utility model is used for the steel cord of 1+N structure. The elliptical design of the central steel wire greatly reduces the strength and fatigue loss caused by the phase change of the steel wire.

[0013] The elliptical steel wire of the utility model is used for the steel cord of 1+N structure. After adopting the elliptical steel wire, the material penetration of the cord will be greatly improved, and the adhesion and fatigue of the steel cord in rubber will be significantly improved.

[0014] The elliptical steel wire of the utility model is used for the steel cord of 1+N structure. The elliptical structure of the central steel wire causes less damage to the steel wire and can effectively solve the problem of wire breakage in the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] In the figure: 1-core monofilament, 2-outer steel wire. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] Example 1: Figure 1 As shown, an elliptical steel wire is used for a steel cord with a 1+N structure. The steel cord includes a core strand 1 and an outer layer of steel wires 2 with N steel wires. The core strand 1 is elliptical in shape. The diameter detection of the center steel wire requires selecting the major axis and minor axis diameters of the ellipse to calculate the mean value, and the ratio of the major axis to the minor axis is in the range of 1.1 to 2.0.

[0019] The steel cord can be extended to any one of the existing 1+N structure steel cords, where N is between 5 and 10, preferably, N is 5, 6 or 7.

[0020] The diameter of the core strand 1 is larger than the diameter of the single outer layer steel wire 2 .

[0021] The outer steel wire 2 and the core strand 1 are both made of carbon steel.

[0022] The lay pitch of the steel cord is in the range of 10 to 22 mm.

[0023] The processing method of the utility model is as follows:

[0024] ①. Wet drawn steel wire is drawn into a round steel wire of 0.1-0.4mm, and the preferred steel wire diameter is between 0.25-0.38mm.

[0025] ②. The round steel wire is transformed into an elliptical core strand 1 by using an elliptical wet drawing die or an elliptical single-stage or multi-stage roller (the multi-stage roller has better deformation accuracy and heat dissipation effect), and the ratio of its major axis to minor axis is within the range of 1.1 to 2.0.

[0026] ③. The N outer steel wires 2 are wrapped around the core strands 1 through a twisting machine to form a steel cord. The twist pitch of the steel cord is within the range of 10 to 22 mm. The diameter of the core strands 1 is larger than the diameter of the outer steel wires 2. The value of N is between 5 and 10, with the optimal range being 5 to 7. It is best used in a 1+6 steel cord structure.

[0027] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An elliptical steel wire is used for a steel cord with a 1+N structure, characterized in that: The steel cord comprises a core monofilament (1) and outer layer steel wires (2) with N steel wire roots. The core monofilament (1) adopts an elliptical phase transformation, and the ratio of its major axis to its minor axis is within the range of 1.1 to 2.

0.

2. The elliptical steel wire used for a 1+N structure steel cord according to claim 1, characterized in that: The value of N is between 5 and 10.

3. The elliptical steel wire used for a 1+N structure steel cord according to claim 1, characterized in that: The diameter of the core strand monofilament (1) is greater than the diameter of the single outer layer steel wire (2).

4. The elliptical steel wire used for a 1+N structure steel cord according to claim 1, characterized in that: The outer layer steel wire (2) and the core strand monofilament (1) are both made of carbon steel.

5. The elliptical steel wire used for a 1+N structure steel cord according to claim 1, characterized in that: The lay length of the steel cord is in the range of 10 to 22 mm.

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