A method of manufacturing a two-layer twisted wire products

 

The method relates to metallurgical production, in particular, t0manufacturer of steel cord used for reinforcing tires, conveyor belts, high pressure hoses, and other rubber products, as well as ropes, cables. A method of manufacturing a two-layer twisted wire products includes simultaneous strand of the core and the outer layer. The Central core and the finished product recoil using the dual torsion different steps of the strand in one production step, and the Central core are twisted with a preliminary step t0then rigged with the same lay direction of the core and the outer layer SS or ZZ or turn off in opposite directions of lay of the core and the outer layer ZS, SZ, simultaneously with the operation of the two-ply strand twisted wire products according to the following dependencies:

where t0- the preliminary step of strand core;

tk- the final step of the strand core;

tm- step strand twisted wire products;

(-) - twisted wirework with the same lay direction of the core Nar is the strand core Z and the outer layer Z;

(+) - twisted wirework with opposite lay direction of the core and the outer layer ZS, SZ at the right-hand strand core Z and left-hand strand of the outer layer S or left-hand strand core S and the right-hand strand of the outer layer Z.

The method is distinguished by obtaining products of high quality. 3 C.p. f-crystals, 1 Il.

The invention relates to metallurgical production, in particular to the manufacture of steel cord used for reinforcing tires, conveyor belts, high pressure hoses, and other rubber products, as well as ropes and cables.

Known methods of production of steel cord consisting of a Central core and an outer layer that have the same or different diameter wires, the same or the opposite direction of the strand and the different steps of the strand is produced in two manufacturing operations, i.e. operations strand of the core and the outer layer of the steel cord are manufactured separately and on different types of machines slivochnyh[1], [2].

The disadvantage of this method is the low productivity and high cost.

In kachestenny core and outer layer, consisting of the same or different wire diameters. With this method, the steel cord is made with the same direction and pitch of the strand wires of the core and the outer layer.

The disadvantage of this method is the formation of the structure of the steel cord, which is the phenomenon of migration wires”, i.e., in practice, when using tire one or more wires are shifted along the adjacent and acts on the end of the cord, piercing the bus, removes it from the system.

Another disadvantage of this method is the lack of the possibility of manufacturing a two-layer twisted wire products in one production step with different steps of the strand of the Central core and the outer layer.

The present invention is to provide a method of manufacturing method of a double twisting double-layer twisted wire products with different steps of the strand with a high degree of machinability.

Another objective of the present invention is to provide a method of manufacturing a two-layer twisted wire products, increasing angerous the ability of the threads and eliminates the appearance migration wires from the structure of the product during use, uvelichenie.

Technical result achieved with the use of the invention is to achieve a high degree of workability and improving the quality of products by increasing ancarola the ability of the wires that make up the product structure.

The solution of this problem is provided by the fact that the proposed method of manufacturing twisted wire products using the dual torsion involves the simultaneous strand of the core and the outer layer, in which the Central core and the finished product recoil using the dual torsion different steps of the strand in one production step.

This Central core is twisted with a preliminary step taboutand then rigged with the same lay direction of the core and the outer layer SS or ZZ (with left-hand strand core S and the outer layer S or the right-hand strand core Z and the outer layer Z) or turn off in opposite directions of lay of the core and the outer layer ZS, SZ (right-hand strand core Z and left-hand strand of the outer layer S or left-hand strand core S and the right-hand strand of the outer layer Z) simultaneously with the operation of the two-ply strand twisted pravoochranitelnych step strand core;

tk- the final step of the strand core;

tm- step strand twisted wire products;

(-) - twisted wirework with the same lay direction of the core and the outer layer (SS or ZZ);

(+) - twisted wirework with opposite lay direction of the core and the outer layer (ZS, SZ).

The method includes simultaneous strand 2-7 wires of the core and 4-15 wires of the outer layer. Wire core have the same or different diameter wires of the outer layer of a twisted product. Preferably used wire coated or uncoated, made from high quality steel with a carbon content of 0.65 to 1.0%.

This problem is solved by the method of double torsion when the strand of the core and the two-layer twisted wire products in one production step with different steps of the strand and with the same (SS or ZZ) or opposite (ZS, SZ), the direction of the strand. When this wire core twist with a preliminary step of strand to, considerably more desired in the finished product under the same direction of lay of the wires of the core and the outer layer of a twisted wire product (SS or ZZ), or prevariti strand wires of the core and the outer layer of a twisted wire products (ZS, SZ).

Achieving the desired step of the strand wires of the core in the finished two-ply wit wire product, they are manufactured with the same step of the strand wires of the core and the outer layer (SS or ZZ), at the expense of twist, a preliminary step of strand core tobefore the final step of strand tksimultaneously with the operation of the strand twisted wirework increments strand tm.

In the manufacture of two-ply twisted wirework with the opposite direction of the strand wires of the core and the wires of the outer layer (ZS, SZ), achieving the desired step of the strand wires of the core is ready wit wire product at the expense of otkrytki a preliminary step, strand tobefore the final step of strand tksimultaneously with the operation of the strand twisted wirework increments strand tm.

Typically, the core consists of 2-7 wires, and the outer layer of 4-15 wires. Wire core have the same or different diameter wires of the outer layer of a twisted product. Preferably used wire coated or uncoated, made from high quality steel with a carbon content of 0.65 to 1.0%.

Thus, when the projectors, the layer (SS or ZZ) the number of turns necessary for formation of the final step of the strand core is determined by the sum of the number of turns required for the formation step of the strand twisted wirework and a preliminary step of strand core.

hence, a preliminary step of strand wire core

In the manufacture of two-ply twisted wirework with the opposite direction of the strand wires of the core and the outer layer (ZS, SZ), the number of turns required for the formation of the final step of the strand core is determined by the difference in the number of turns required for the formation of a preliminary step of the strand wires of the core and the step of strand twisted product.

hence, a preliminary step of strand wire core

The step of strand twisted wirework to the preliminary step of strand core according to (1) is

according to (2) is

In the proposed method, lay the linear speed of extrusion of the core module of the double strand twisted wirework and accordingly, equals the linear speed of extrusion of a twisted wirework Nmtm

Ncto=Nmtm,

from here check the correctness of calculations, a preliminary step of strand core

The ratio of speed of rotation of the rotors module dual - preliminary strand core (Ncand rotors double strand ready twisted wirework (Nm) is determined by the expression

hence the speed of rotation of the rotors module dual - preliminary strand core

where (-) - twisted wirework with the same lay direction of the core and the outer layer (SS or ZZ);

(+) - twisted wirework with opposite lay direction of the core and the outer layer (ZS, SZ).

Description of best mode for carrying out the present invention

In Fig.1 schematically shows a method of manufacturing a two-layer twisted wire products according to this invention.

The essence of the proposed method is to combine the operations on the production of the Central core and ready via torsion (Fig.1), consisting of a static module unwinding (1) and the module of the double torsion (2), optional module of the double torsion (3).

This method includes the following steps: unwinding a first group of wires forming the core from a supply coil (4) and the twist in the core (5) in the module, double-strand (3) with a preliminary step of strand to.

The twisting of the wires in the core is due to the rotational motion of the rotor (6) and the flywheel (7) the module of the double strand (3) and the translational motion of the core with the linear speed of the exhaust Ycwhich is defined by an exhaust device (8) module double-strand double-layer twisted wirework (2) and, respectively, equal to the linear speed of extrusion of a twisted wirework Ym.

The next stage is the passage of the core is formed with a preliminary step toand the second group of wires from supply coils (9), module static unwinding (1) through distribution pattern (10), forming a sleeve (11) and crimp die (12) to form the outer layer around the core.

Further stage involves the submission of pre-formed two-layer twisted wirework to the driven rollers (13), me coil (18) module double-strand double-layer twisted wirework (2), where oped a two-layer wire product sbivaetsya with the preset step strand tm. Simultaneously with the process of strand two-ply twisted wirework is backspin preliminary step of strand core tobefore the final step, tkin case the core and the outer layer have the same lay direction (SS or ZZ). When the direction of rotation of the rotors and flywheels module preliminary strand core (3) and the module of the double strand twisted wire products (2) - opposite (SZ or ZS).

If oped a two-layer wire product has the opposite lay direction of the core and the outer layer, in this case, in the process of strand twisted product increments strand tmin module double strand twisted product (2) is making a preliminary step of strand core tobefore the final step of strand tk. When the direction of rotation of the rotors and flywheels module preliminary - double strand core (3) and the module of the double strand twisted wire products (2) - same (SS or ZZ).

In the proposed method (Fig.1) instead of a static module unwinding (1) module can be used with rotary unwinding, i.e. with backspin Pb manufacturing two-layer twisted wirework we will show by examples:

a) Fabrication of steel structures 2+7×0,23 SS with the same direction of lay of the wires of the core and the outer layer (SS or ZZ).

Original data:

the speed of rotation of the rotors and flywheels module strand steel cord 3250 rpm,

- step strand steel cord 12.5 mm,

- the final step of the strand wires of the core - 6,3 mm

Find:

The ratio between the number of revolutions of the rotors module preliminary strand core and module double-strand steel cord (K):

The number of revolutions of the rotors module dual strand wire core:

A preliminary step of strand wire core:

Validation calculations preliminary step of strand core:

b) Manufacture of steel cord construction 3×0,20+6×0,35 SZ opposite direction of the strand wires of the core and the wires of the outer layer (ZS, SZ):

Original data:

the speed of rotation of the rotors module double-strand steel cord 3250 rpm

- step strand steel cord 18,0 mm

- the final step of the strand wires of the core - 10.0 mm

Find the strand of steel:

The speed module dual - preliminary strand wire core:

A preliminary step of strand core:

Validation calculations preliminary step of strand wire core:

In comparison with steel cord of 2+7×0,23 SS and 3×0,20+6×0,35 SZ manufactured with different steps of strand core and finished steel cord in two separate operations in the manufacture of this new technology, performance is increased up to 60%. New technology eliminates the possibility of migration of threads twisted wirework. However, the use of the new method is preferable in the manufacture of steel cord with the same lay direction of the core and steel (SS and ZZ). In the manufacture of steel cord with opposite lay direction of the core and the steel cord application of the new method is limited to high speed rotors and flywheels module preliminary - double-strand core.

Sources of information:

1. Patent: US. 3,358,345 from 1967-12-19.

2. Bukstein M. A. Production and ispolzovanie:2mm;">Claims

1. A method of manufacturing a two-layer twisted wire products, including simultaneous strand of the core and the outer layer, characterized in that the Central core and the finished product recoil using the dual torsion different steps of the strand in one production step, and the Central core are twisted with a preliminary step t0and then rigged with the same lay direction of the core and the outer layer SS or ZZ or turn off in opposite directions of lay of the core and the outer layer ZS, SZ simultaneously with the operation of the two-ply strand twisted wire products according to the following dependencies:

where t0- the preliminary step of strand core;

tk- the final step of the strand core;

tm- step strand twisted wire products;

(-) - twisted wirework with the same lay direction of the core and the outer layer SS or ZZ left strand core S and the outer layer S or the right-hand strand core Z and the outer layer Z; (+) - twisted wirework with opposite lay direction of the core and outside the it strand core S and the right-hand strand of the outer layer Z.

2. The method according to p. 1, characterized in that it includes simultaneous strand 2-7 wires of the core and 4-15 wires of the outer layer.

3. The method according to p. 1 or 2, characterized in that the strand of the product is made from wires of the same or different diameters.

4. The method according to one of paragraphs.1-3, characterized in that for the manufacture of products using wire, coated or uncoated, made from high quality steel with a carbon content of 0.65 to 1.0%.



 

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