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Open off-road tire ropes with preformed wires

A steel wire and steel rope technology, applied in the field of off-road tires, can solve the problems of insufficient rubber permeability and difficulty in ensuring long service life, and achieve the effects of small diameter, good fatigue resistance, and good fuel economy

Active Publication Date: 2016-06-08
NV BEKAERT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rubber of this steel rope is not permeable enough to ensure its long service life

Method used

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  • Open off-road tire ropes with preformed wires
  • Open off-road tire ropes with preformed wires
  • Open off-road tire ropes with preformed wires

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0047] A polygonal preformed wire can be produced as follows.

[0048] The wire rod composition contains 0.70%-1.10% carbon, 0.40%-0.70% magnesium, 0.15%-0.30% silicon, maximum 0.03% sulfur, maximum 0.30% phosphorus, all percentages are by weight. Apart from very high tensile strengths, copper, nickel, aluminium, titanium and nitrogen and / or chromium are usually present in only trace amounts.

[0049] first by mechanical descaling and / or by 2 SO 4 Or chemical pickling in HCl solution to clean the wire in order to remove oxides on the surface. The wire is then rinsed in water and then dried. The dried wire is then subjected to a first set of dry drawing operations to reduce the diameter down to a first intermediate diameter.

[0050] At this first intermediate diameter, for example at about 3.0 to 3.5 mm, the dry drawn wire is subjected to a first intermediate heat treatment, called annealing treatment. The wire is then ready for the next step of mechanical deformation.

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Abstract

A steel cord (10) for reinforcing rubber product comprises at least one core strand (12) and outer strands (14), the outer strands (14) are helically twisted around at least one core strand (12). Each of the strands (12, 14) comprises core steel filaments (16, 20) with the number of m and outer steel filaments with the number of n. The diameter of the core steel filaments in the core strand is Dcc, the diameter of the outer steel filaments in the core strand is Doc, the diameter of the core steel filament in the outer strand is Dco, and the diameter of the outer steel filament in the outer strand is Doo. The ratio of Dcc / Doc is not less than 1.04, the ratio of Dco / Doo is not less than 1.03, and the ratio of Doc / Dco is not less than 1. The core steel filaments and outer steel filaments are polygonally preformed before being twisted into strands. The steel cord is used for reinforcing off-the-road tire.

Description

technical field [0001] This invention relates to steel cords for reinforcing rubber articles. The invention also relates to off-road tires reinforced by such steel cords. Background technique [0002] Off-road tires (OTR tires) include tires for construction vehicles such as wheel loaders, motor graders, trenchers, etc., as well as large mining trucks. Such tires are always used as heavy duty tires. The steel cord that reinforces the OTR tire consists of multiple steel wire strands. A steel rope usually has a plurality of steel wire strands of structure m+n. The structure "m+n" means that the wire strand has m core wires and n outer wires twisted around the core wires. Steel cords used to reinforce OTR tires always need to have high strength to withstand heavy loads. [0003] Due to their special purpose, OTR tires are usually large and heavy. The steel cord must therefore be thick to have sufficient strength to reinforce such an OTR tire. But this will bring another ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D07B1/06
CPCD07B1/0613D07B1/0646D07B1/0653
Inventor 程志超王鹏飞黄忠伟盛小道
Owner NV BEKAERT SA