Steel cord

A technology of steel cord and monofilament, applied in the field of steel cord, can solve the problems of infiltration, corrosion, corrosion of steel cord, etc., and achieve the effect of good quality and long life

Active Publication Date: 2019-07-02
NV BEKAERT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the use or running of heavy duty tires, OTR cords are subjected to very heavy loads which impart strong forces to the core monofilaments in the core strands of the OTR cords , and sometimes the force makes the core monofilaments migrate out of the rubber layer and then exposed to air (so-called core monofilament migration), and this makes the steel cord strength worse and causes corrosion problems because the core monofilament migration leads to moisture Penetrates into the rubber layer and corrodes the steel cord

Method used

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Embodiment Construction

[0025] Steel monofilaments for steel cords are made from wire rods.

[0026] first by mechanical descaling and / or by 2 SO 4 Or chemical pickling in HCl solution to clean the wire rod to remove the oxides present on the surface. The rods are then rinsed in water and dried. The dried wire rod is then subjected to a first series of dry drawing operations to reduce the diameter to a first intermediate diameter.

[0027] At this first intermediate diameter, for example, at about 3.0 mm to 3.5 mm, the dry drawn wire is subjected to a first intermediate heat treatment known as plumbing. Leading means first austenitizing to a temperature of about 1000°C, followed by transformation from austenite to pearlite at a temperature of about 600°C to 650°C. The wire is then ready for further mechanical deformation.

[0028] Then, in a second step of the diameter reducing step, the wire is further dry drawn from the first intermediate diameter to a second intermediate diameter. The second...

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Abstract

The invention relates to a steel cord used for reinforcing rubber. The steel cord comprises a core strand and at least three outer strands twisted around the core strand, wherein the core strand comprises at least one first core monofilament and a plurality of first outer monofilaments twisted around the first core monofilaments; each outer strand comprises a plurality of second monofilaments, atleast one of the plurality of first outer monofilaments is preformed before being twisted into the core strand, and at least one of the second steel monofilaments is straight until being twisted to form each outer strand. The steel cord has improved performance in the aspect of core monofilament migration.

Description

technical field [0001] The present invention relates to steel cords for rubber reinforcement. The invention also relates to tires reinforced with steel cords. Background technique [0002] Steel cords used to reinforce heavy-duty tires such as off-road tires need to have high strength, so steel cords have multiple strands including multiple monofilaments to achieve high strength, and such steel cords are so-called OTR cords Wire. [0003] Usually OTR cords have a multi-strand construction, and this gives steel cords high strength and high breaking load. [0004] During the use or running of a heavy-duty tire, the OTR cord is subjected to a very heavy load, which gives a strong force to the core monofilament in the core strand of the OTR cord, and sometimes this force causes the core monofilament to migrate out of the rubber layer And then exposure to air (so-called core monofilament migration), and this makes the steel cord strength worse and causes corrosion problems, be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D02G3/48D02G3/12D02G3/36B60C9/00
CPCD02G3/48D02G3/12D02G3/36B60C9/0007D07B1/0613D07B1/0633D07B1/0646D07B1/0653D07B2201/2008D07B2201/2052D07B2201/2061D07B2201/2097D07B2205/3035D07B2205/3053D07B2207/4045D07B2401/201D07B2401/208D07B2501/2046B60C2009/0092B60C2009/2077B60C2009/2096B60C2009/209B60C9/0057B60C2200/14B60C2200/06D07B2801/14D07B2801/24D07B2801/60D07B2801/10B60C9/18B60C2009/2074D07B2205/3025
Inventor 王钰萍黄涛
Owner NV BEKAERT SA
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