Steel cord with compact structure and preparation method thereof

Abstract

The invention discloses a steel cord with a compact structure. The steel cord comprises a core wire with the diameter of D1, a plurality of layer wires with the same twisting direction and the same twisting distance as the core wire are twisted around the core wire, the layer wires comprise middle layer wires and outer layer wires, the middle layer wires consist of five middle layer monofilamentswith the diameter of D2, and the outer layer wires consist of nine outer layer monofilaments with the diameter of D3, wherein the diameters of the core wire, the middle layer monofilaments and the outer layer monofilaments meet the following relationship that D2 is larger than D1 and smaller than D3. The invention further discloses a preparation method of the steel cord. The preparation method comprises the following steps of (1) performing surface treatment on a wire rod, performing rough drawing, performing normalizing treatment to remove work hardening, and performing medium drawing to obtain a dry-drawn steel wire; (2) enabling the dry-drawn steel wire to be subjected to lead bath isothermal quenching and brass electroplating, and obtaining a brass-plated steel wire; and (3) carrying out wet drawing on the brass-electroplated steel wire, conducting stranding, forming a rope, and inspecting to obtain the steel cord with the compact structure.

Description

technical field [0001] The invention relates to the technical field of tires, in particular to a steel cord with a compact structure and a preparation method thereof. Background technique [0002] Steel cord is the most widely used skeleton material in rubber tire products. At present, the existing steel cord is prepared by winding multiple steel wires with different diameters in the same twist direction and the same lay length. The cross-section is large, so it can accommodate a lot of monofilaments, and the arrangement between monofilaments and monofilaments and between layers is too tight, which leads to poor rubber penetration performance when steel cords are added to rubber during vulcanization. Low, high air content, affecting the quality of the finished tire. Contents of the invention [0003] The technical problem to be solved by this invention is: [0004] Existing steel cords are arranged too tightly between monofilaments, which leads to poor penetration perfor...

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Problems solved by technology

[0002] Steel cord is the most widely used skeleton material in rubber tire products. At present, the existing steel cord is prepared by winding multiple steel wires with different diameters in the same twist direction and the same lay length. The cross-section is large, so it can accommodate a lot of monofilaments, and the arrangement between monofilaments and monofilaments and between layers is too tight, which leads to poor rubber penetration performance when steel cords are added to rubber during vulcanization. Low, high air content, which affects the quality of the finished tire

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