Abstract:
A steel cord for reinforcing pneumatic tire, is a multi-layered steel cord comprising a core, an intermediate layer and an outer layer. The core has four filaments, the intermediate layer has nine filaments, and the outer layer has fourteen filaments. At least one filament of the steel cord has a tensile strength no less than (3800- 2000xd)Mpa and d is the diameter of the filament. The twist direction of the filaments may be the same, and the ratio between the lay length of intermediate lay and the lay length of the outer lay is between 0.70 and 0.90. This steel cord achieves a good balance between tensile strength and rubber penetration, but also is cost-effective to manufacture and use.
Abstract:
A steel cord (38) comprises a first group and a second group. The second group is helically twisted around the first group with a cord twisting step. The first group comprises a first number of first steel filaments (10). The first number ranges between three and eight. The second group comprises a second number of second steel filaments (26). The second number is equal to or greater than the first number. The first filaments (10) having a twisting step greater than 300 mm. At least one of the second filaments (26) is polygonally preformed in order to allow rubber penetration.
Abstract:
An apparatus (310) for manufacturing stranded cables comprises a supply spool assembly (320, 322) having filaments wound thereon, and a flyer (316) mounted for rotation about a central axis for imparting a rotational movement to the filaments, while guiding them axially through the apparatus (310). The filaments are wound together as they pass a gathering point centrally disposed to the central axis and downstream of the flyer (316). A filament advancing assembly (16) is provided downstream of the gathering point to impart an advancing speed to the filaments. A control system allows for the control of the number of revolutions of the flyer (316) per unit length of filaments advancing through the gathering point to ensure that a constant helical pitch is obtained. The tension in the filaments is controlled by creating an adjustable opposition to the pulling action of the filament advancing assembly (16) on the filaments thereby ensuring the production of a high quality stranded cable.
Abstract:
Disclosed are a steel wire rope having a six-strand fiber filled core and a process and special equipment for manufacturing same. The steel wire rope comprises a steel core (1), and six outer layer strands (2) twisted on the steel core, with each of the outer layer strands (2) being compacted individually, and an oil-containing high molecular polymer cord (3) embedded between the steel core and two adjacent outer layer stands. By means of a compacting process applied to the outer layer strands, the outer surfaces thereof become tidy and smooth, so that the contact areas between the steel wire rope and a pulley, a winding drum, and a supporting roller are increased, the stress concentration is reduced, and the probability of the steel wire rope being scrapped as a result of wires breaking prematurely is reduced; and embedding the oil-containing high molecular polymer cord between the steel core and two adjacent outer layer strands effectively solves the problems of insufficient oil storage in the steel wire rope and rigid contact between the strands and the core, such that the service life of the steel wire rope is increased by more than 80% as compared with the steel wire ropes originally used.
Abstract:
An apparatus (310) for manufacturing stranded cables comprises a supply spool assembly (320, 322) having filaments wound thereon, and a flyer (316) mounted for rotation about a central axis for imparting a rotational movement to the filaments, while guiding them axially through the apparatus (310). The filaments are wound together as they pass a gathering point centrally disposed to the central axis and downstream of the flyer (316). A filament advancing assembly (16) is provided downstream of the gathering point to impart an advancing speed to the filaments. A control system allows for the control of the number of revolutions of the flyer (316) per unit length of filaments advancing through the gathering point to ensure that a constant helical pitch is obtained. The tension in the filaments is controlled by creating an adjustable opposition to the pulling action of the filament advancing assembly (16) on the filaments thereby ensuring the production of a high quality stranded cable.