CN104005244A

CN104005244A - Extra high strength steel cord production method

Info

Publication number: CN104005244A
Application number: CN201310062215.1A
Authority: CN
Inventors: 顾军; 李建军; 崔世云
Original assignee: JIANGSU BAOSTEEL PRECISION STEEL WIRE CO Ltd
Current assignee: JIANGSU BAOSTEEL PRECISION STEEL WIRE CO Ltd
Priority date: 2013-02-27
Filing date: 2013-02-27
Publication date: 2014-08-27

Abstract

Disclosed is an extra high strength steel cord production method. The extra high strength steel cord production method includes: entwisting multiple strands of high strength steel wires into a rope; afterwards, feeding the rope into a straightening machine for straightening and residual stress elimination; then feeding the rope into a virtual entwisting machine, and winding up the rope so as to form a coil. The straightening machine is composed of two rows of V-shaped wheels which are vertically arranged in staggered mode, and a height difference is set between horizontal axes of the two rows of the V-shaped wheels, and furthermore the steel wire rope passes through the straightening machine in undulate mode. The extra high strength steel cord production method can firstly eliminate part of residual stress on the surface of a cord thread, and then eliminates internal stress of the cord thread through the virtual entwisting machine, and due to the fact that the straightening machine eliminates the part of the residual stress, regulation effects of the virtual entwisting machine are reduced, rotation speed of the virtual entwisting machine is reduced, and accordingly the number of wire breaking phenomena is effectively decreased.

Description

A kind of extra-high tensile steel cord production method

Technical field

The present invention relates to steel cord production technology, particularly a kind of extra-high tensile steel cord production method.

Background technology

The current device of eliminating steel wire residual stress has false twist device, straightener etc.Mainly for be all regular tenacity and high-intensity steel wire rope, wherein false twist device is owing to becoming the device that main flow is eliminated Residual torsion by on-line control, straightener as servicing unit be all arranged on false twist device after, steel cord is played to drum, bend high performance and regulate.

For Extra High Strength (more than tensile strength 3500MPa) although also applicable this kind of device of steel cord, but because residual stress in steel wire twisting process all inevitably exists, and the increase along with intensity, saturated Residual torsion increases, so Extra High Strength cord makes saturated torsion value very large because intensity is high, for eliminating Residual torsion, false twist device needs rotating speed faster in the cord of production unit length, make steel wire more easily arrive plastic period, produce fracture of wire.

Summary of the invention

The object of the present invention is to provide a kind of extra-high tensile steel cord production method, can effectively reduce fracture of wire probability in steel cord production process.

For achieving the above object, technical scheme of the present invention is:

An extra-high tensile steel cord production method, twists with the fingers a strand one-tenth rope by multiply extra high strength steel wire, then enters straightener aligning, eliminates residual stress, then enter false twist device, take-up rolling; Wherein, straightener is comprised of the V-arrangement wheel that two rows of mutually staggered arrangement is vertically set, and between the horizontal axis of two row's V-arrangements wheels, establishes a difference in height, and steel wire rope undulate passes through straightener.

Steel wire is in being twisted into cord process, on steel cord surface, can produce positive shear stress, during then by false twist device, on cord surface, produce negative shear stress and reach the effect of eliminating cord residual residue stress, intensity is higher, the shear stress producing is larger, thereby the false twist device rotating speed requiring is also higher, fracture of wire risk is also larger, and the present invention can first eliminate cord surface part residual stress by straightener, (cord is eliminated the external carbuncle on cord surface by the alternating bending of straightener wheel, and then process false twist device is eliminated the internal stress of cord), because straightener has been eliminated part residual stress, false twist device regulating action can reduce, rotating speed reduces, thereby effectively reduce fracture of wire.

The invention has the advantages that:

The present invention has effectively eliminated most of residual stress of cord by straightener, guaranteeing that false twist device can play the speed that reduces as much as possible false twist device under the effect prerequisite of eliminating Residual torsion, reduces the degree of unit length cord twisting.

Accompanying drawing explanation

Fig. 1 is process chart of the present invention.

The specific embodiment

Referring to Fig. 1, extra-high tensile steel cord production method of the present invention, twists with the fingers a strand one-tenth rope by multiply extra high strength steel wire 100 through twisting apparatus 1, then enters straightener 2 alignings, eliminates residual stress, then enter false twist device 3, take-up rolling; Wherein, straightener 2 is comprised of the V-arrangement wheel that two rows of mutually staggered arrangement is vertically set, and between the horizontal axis of two row's V-arrangements wheels, establishes a difference in height, and steel wire rope undulate passes through straightener.

Straightener two skate have the difference in height of 0.5mm, when cord is taken turns by the V-arrangement of straightener, straightener is to the certain amount of being pressed into of cord, cord is in the rotation of wheel rooved face, be equal to small-sized false twist device, alternating bending by several groups of wheels is rotated, and reaches and eliminates cord surface residual stress, thereby reduce the twisting fracture of wire that the effect of false twist device causes.

With 2+4 * 0.17UT, tensile strength 3500MPa extra-high tensile steel cord is produced and is made comparisons:

By traditional handicraft method, produce, when the speed of a motor vehicle is per minute 3000 while turning, now false twist device rotating speed turns up to per minute 4100, and cord causes in false twist device frequently fracture of wire because of violent twisting.

The present invention is that steel wire is first through effectively eliminating the straightener of cord residual residue stress, pass through again false twist device, now false twist device rotating speed is per minute 3300 to turn, theoretical calculate that to reverse while reaching capacity false twist device rotating speed be per minute 3200 to turn, visible steel wire of the present invention has just reached plastic period after false twist device, fracture of wire phenomenon obviously reduces, and traditional handicraft has been in plastic period.

Wire broken rate statistics, wire broken rate of the present invention is 0.17 time/ton, and traditional handicraft is 16.34 times/ton, and visible traditional handicraft almost cannot be carried out volume production, and wire broken rate of the present invention has reduced by 100 times nearly, thus having guaranteed batch production, production efficiency significantly improves.

Claims

1. an extra-high tensile steel cord production method, twists with the fingers a strand one-tenth rope by multiply extra high strength steel wire, then enters straightener aligning, eliminates residual stress, then enter false twist device, take-up rolling; Wherein, straightener is comprised of the V-arrangement wheel that two rows of mutually staggered arrangement is vertically set, and between the horizontal axis of two row's V-arrangements wheels, establishes a difference in height, and steel wire rope undulate passes through straightener.