阅读说明：本技术 一种钢丝绳双模拉拔单次成型的生产方法 (Production method for double-mold drawing and single-forming of steel wire rope ) 是由 朱建新 陶志刚 陈靛 张磊 戴丽君 蒋婷慧 陈浩平 李舟 于 2021-09-13 设计创作，主要内容包括：本发明提供一种钢丝绳双模拉拔单次成型的生产方法,所述生产方法包括经湿式拉拔后的不锈钢母线得到中心丝、第二层丝和第三层丝,中心丝和第二层丝穿过第一模具制成中心股后,与第三层丝共同进入第二模具,经捻制合绳和后变形消应力处理,得到钢丝绳产品。本发明所述生产方法操作简单,得到的钢丝绳产品具有更高的破断拉力、更高尺寸精度和一定的柔韧度,且钢丝绳产品的表面更光滑。(The invention provides a production method for double-mold drawing and single-forming of a steel wire rope, which comprises the steps of obtaining a central wire, a second layer wire and a third layer wire from a stainless steel bus subjected to wet drawing, enabling the central wire and the second layer wire to pass through a first mold to be manufactured into a central strand, enabling the central wire and the second layer wire and the third layer wire to jointly enter a second mold, and obtaining a steel wire rope product through twisting and rope combination and post-deformation stress relief treatment. The production method provided by the invention is simple to operate, the obtained steel wire rope product has higher breaking tension, higher dimensional accuracy and certain flexibility, and the surface of the steel wire rope product is smoother.)

1. A production method for double-die drawing and single-forming of a steel wire rope is characterized by comprising the following steps:

(1) drawing the stainless steel bus to obtain a stainless steel wire; the stainless steel wire is divided into a central wire, a second layer of wires and a third layer of wires;

(2) the central wire, the second layer of wires and the third layer of wires respectively penetrate through a central hole, a second layer of positioning holes and a third layer of positioning holes of the wire distributing plate, and the central wire and the second layer of wires enter a first die to be twisted and drawn to obtain a central strand;

(3) the central strand and the third layer of filaments enter a second die to be drawn, and twisted and combined to obtain a twisted steel wire rope;

(4) and (4) performing post-deformation stress relief treatment on the twisted steel wire rope to obtain a steel wire rope product.

2. The method of producing as claimed in claim 1 wherein step (1) the stainless steel bus bar comprises a 304 stainless steel bus bar;

preferably, the 304 stainless steel bus comprises the following components in percentage by mass: 0.042-0.048% of C, 18.3-18.6% of Cr, 8.20-8.30% of Ni, 0.67-0.90% of Mn, 0.29-0.35% of Si, less than or equal to 0.032% of P, less than or equal to 0.003% of S, less than or equal to 0.008% of N, and the balance of Fe and inevitable impurities;

preferably, the strength of the 304 stainless steel bus is 720-780 MPa;

preferably, the elongation of the 304 stainless steel bus bar is 35% -45%.

3. The production method according to claim 1 or 2, wherein the drawing of step (1) comprises wet drawing;

preferably, the oil temperature of the wet drawing is less than or equal to 45 ℃;

preferably, the third layer of filaments comprises a first layer of filaments and a second layer of filaments;

preferably, the surface reduction rate of the 304 stainless steel bus is 91.4-92.5% by wet drawing;

preferably, after the wet drawing, the ratio of the diameter of the central wire, the diameter of the second layer wire, the diameter of the first layer wire, the diameter of the second layer wire, and the diameter of the third layer wire is 39:35:28: 35;

preferably, the strength of the stainless steel wire is > 1960 MPa;

preferably, the circle diameter of the stainless steel wire is more than 15 cm;

preferably, the stainless steel wire is twisted more than 40 times.

4. The production method according to any one of claims 1 to 3, wherein the distribution board of the step (2) comprises 1 central hole, 6 second-layer positioning holes and 12 third-layer positioning holes;

preferably, the material of the distributing plate comprises iron;

preferably, the material of the central hole of the distribution plate, the material of the second layer of positioning holes and the material of the third layer of positioning holes respectively and independently comprise hard alloy steel;

preferably, the included angle between the central line of the second layer of positioning holes and the central line of the distributing board is 60 degrees;

preferably, the distance between the center of the second layer of positioning holes and the center of the distributing board is 34-40 mm;

preferably, the included angle between the center line of the third layer of positioning holes and the center line of the distributing plate is 30 degrees;

preferably, the distance between the center of the third layer of positioning holes and the center of the distributing board is 44-50 mm;

preferably, the six first-layer wires and the six second-layer wires penetrate through the third positioning holes in a staggered mode.

5. The production method according to any one of claims 1 to 4, wherein the first mold of step (2) has a pore size of 1.02 to 1.03 mm;

preferably, the bearing length of the first die is 0.7-1.7 mm.

6. The production method according to any one of claims 1 to 5, wherein the second mold of step (3) has a pore size of 1.502 to 1.518 mm;

preferably, the length of the bearing belt of the second die is 0.87-1.87 mm;

preferably, the outer material of the first and second dies each independently comprises a hard alloy steel;

preferably, the cores of the first and second molds each independently comprise a polycrystalline core;

preferably, the inlet angles of the first and second dies are each independently 60 ° ± 3 °;

preferably, the compression zone angles of the first and second dies are each independently 45 ° ± 1 °;

preferably, the exit angles of the first and second dies are each independently 53 ° ± 2 °.

7. The production method according to any one of claims 1 to 6, wherein the twist direction of the twisted rope in the step (3) is S twist;

preferably, the lay length of the S twist is 10-11.5 times of the diameter of the twisted steel wire rope.

8. The production method according to any one of claims 1 to 7, wherein the post-deformation stress-relief treatment of step (4) is carried out using two sets of deformation devices;

preferably, each set of said deforming means comprises a transverse deformer and a vertical deformer;

preferably, the center distance between adjacent pulleys in the transverse deformer and the vertical deformer is 28-35 mm respectively and independently.

9. The production method according to any one of claims 1 to 8, characterized by comprising the steps of:

(1) carrying out wet drawing on a 304 stainless steel bus with the strength of 720-780 MPa and the elongation of 35% -45% under the condition that the oil temperature is less than or equal to 45 ℃ and the surface reduction rate is 91.4-92.5% to obtain a stainless steel wire; the stainless steel wire is divided into a central wire, a second layer of wires and a third layer of wires; the third layer of filaments comprises a first layer of filaments and a second layer of filaments; after the wet drawing, the diameter ratio of the central wire, the second layer wire, the first layer wire and the second layer wire is 39:35:28: 35; the strength of the stainless steel wire is more than 1960MPa, the ring diameter is more than 15cm, and the twisting frequency is more than 40 times;

(2) the central wire, the six second-layer wires and the third-layer wire respectively penetrate through 1 central hole, 6 second-layer positioning holes and 12 third-layer positioning holes of the wire distributing plate, and the central wire and the second-layer wires enter a first die with the aperture size of 1.02-1.03 mm and the length of a sizing belt of 0.7-1.7 mm to be twisted and drawn to obtain a central strand; the material of the distributing plate comprises iron; the material of the central hole of the distributing board, the material of the second layer of positioning holes and the material of the third layer of positioning holes respectively and independently comprise hard alloy steel; the included angle between the center line of the second layer of positioning holes and the center line of the distributing plate is 60 degrees; the distance between the center of the second layer of positioning holes and the center of the distributing board is 34-40 mm; the included angle between the center line of the third layer of positioning holes and the center line of the distributing plate is 30 degrees; the distance between the center of the third layer of positioning hole and the center of the distributing board is 44-50 mm; the first layer of wires and the second layer of wires penetrate through third positioning holes in a staggered mode;

(3) the central strand and the third layer of silk enter a second die with the aperture size of 1.502-1.518 mm and the length of a bearing belt of 0.87-1.87 mm to be drawn and twisted rope with the twisting distance of 10-11.5 times of the diameter of the twisted steel wire rope and the twisting direction of S twist, so that the twisted steel wire rope is obtained; the outer materials of the first die and the second die respectively and independently comprise hard alloy steel; the cores of the first and second molds each independently comprise polycrystalline cores; the inlet angles of the first and second dies are each independently 60 ° ± 3 °; the compression zone angles of the first and second dies are each independently 45 ° ± 1 °; the exit angles of the first and second dies are each independently 53 ° ± 2 °;

(4) performing post-deformation stress relief treatment on the twisted steel wire rope to obtain a steel wire rope product; the post-deformation stress relief process is processed by using two groups of deformation devices; each group of deformation devices comprises a transverse deformer and a vertical deformer; the center distance between adjacent pulleys in the transverse deformer and the vertical deformer is 28-35 mm respectively and independently.

10. A steel cord, characterized in that it is produced by the production method according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of metal product processing, in particular to a production method for double-mold drawing and single-time forming of a steel wire rope.

Background

The steel wire rope has more and more use in different fields, has higher and more requirements on the quality and the performance, and has higher requirements on the breaking tension of the steel wire rope on the premise of not increasing the diameter of the steel wire rope basically, and the steel wire rope is required to have stronger fatigue resistance and lower elongation.

CN108316028A discloses a steel wire rope composite fiber core and a preparation method and application thereof, wherein the steel wire rope composite fiber core is formed by single stranding of a plurality of composite fiber cores; the single strand of each composite fiber core comprises a main jute core and an outer polypropylene core, and a plurality of polypropylene yarns form the outer polypropylene core and are uniformly wrapped and twisted on the outer side of the main jute core. The jute rope core has the advantages that the jute yarn is adopted to replace sisal yarn to prepare the rope core of the steel wire rope, the problem of large diameter fluctuation of the rope core is avoided, the rope diameter of the jute rope core is uniform, the oil absorption performance is good, and the vibration and the noise of an elevator during operation are effectively reduced; the fatigue yarn breaking rate of the whole rope is superior to that of a sisal rope core; and the composite structure of the polypropylene outer core twisted with the main core of the jute makes up the defect that the strength of the jute fiber is inferior to that of the sisal fiber, and ensures that the strength of the composite fiber core is superior to that of the sisal rope core.

CN103757952A discloses a double-compaction steel wire rope for port machinery, which comprises 1 steel core central strand, 6 steel core outer layer strands and 6 outer layer strands, wherein the steel core is formed by symmetrically wrapping and twisting the steel core central strand by the steel core outer layer strands, and the steel core is symmetrically wrapped and twisted by the outer layer strands. The steel wire rope is a compacted rope, the inner strand of the rope is in surface contact with the strand, the outer strand of the rope is a compacted strand, and the inner steel wire of the strand is in surface contact. The double-compaction steel wire rope for the port machinery is in surface contact with a pulley contact surface after being compacted due to the fact that the structure of the rope strand is extruded by the die, and has ultrahigh breaking force, high wear resistance, high extrusion resistance and high impact load resistance. Compared with the steel wire rope with the same diameter and strength, the bearing capacity of the steel wire rope is improved by 20 percent, the wear resistance is improved by nearly 25 percent, the service life of the steel wire rope is long, and the operation cost of port machinery is correspondingly reduced.

CN104594083A discloses a steel wire rope for a railway compensation device and a production method thereof, which consists of a central strand, a central side strand arranged at the periphery of the central strand and in hexagonal arrangement with the central strand, and an outer layer strand arranged at the periphery of the central side strand and in octagonal arrangement with the central side strand, wherein the number of the central side strand is six, and the number of the outer layer strands is eight; and point contacts are arranged between the central strand and the central edge strand and between the central edge strand and the outer layer strand. The steel wire rope for the railway compensation device has the advantages of simple structure, low production cost, strong tensile strength, fatigue resistance, corrosion resistance and wear resistance, long service life, high filling coefficient and thickened steel wire at the contact layer compared with the conventional steel wire rope, so that the steel wire rope has the advantages of high strength, high fatigue resistance and high electric conductivity.

In the prior art, the improvement of a steel wire rope for large-scale equipment such as an elevator, a port machine and a railway compensation device is focused, and the improvement of the steel wire rope for small-scale devices such as a brake or a speed changer of high-end fitness equipment, high-end bicycles/motorcycles and the like is not provided. These steel cords for small devices are required to have a smooth surface and a certain flexibility, in addition to a higher breaking force and a lower elongation.

Therefore, it is of great significance to develop a method for producing a steel wire rope for a small-sized device, which produces a steel wire rope having a higher breaking force, a lower elongation, a smooth surface and a certain flexibility.

Disclosure of Invention

In view of the problems in the prior art, the invention provides a production method for double-mold drawing and single-forming of a steel wire rope, which can enable a steel wire rope product of 12+6+1 with the same diameter and the same structure to obtain higher breaking tension, higher precision, lower elongation, smoother surface and certain flexibility on the premise of using the original stainless steel bus.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides a production method for double-die drawing and single-forming of a steel wire rope, which comprises the following steps:

(1) drawing the stainless steel bus to obtain a stainless steel wire; the stainless steel wire is divided into a central wire, a second layer of wires and a third layer of wires;

(2) the central wire, the second layer of wires and the third layer of wires respectively penetrate through a central hole, a second layer of positioning holes and a third layer of positioning holes of the wire distributing plate, and the central wire and the second layer of wires enter a first die to be twisted and drawn to obtain a central strand;

(3) the central strand and the third layer of filaments enter a second die to be drawn, and twisted and combined to obtain a twisted steel wire rope;

(4) and (4) performing post-deformation stress relief treatment on the twisted steel wire rope to obtain a steel wire rope product.

The production method adopts the double-mold drawing of the wire distributing plate, and firstly, a central strand is made of a central wire and a second layer of wires; and then the central strand passes through the first die and enters the second die together with the third layer of wires, and the steel wire rope product is obtained through twisting and rope combination and post-deformation stress relief treatment. According to the invention, by adopting a stainless steel bus with a reasonable wire diameter ratio and a certain quality requirement, and adopting the wire distribution plate and the two dies, a steel wire rope product with higher breaking tension, higher dimensional accuracy, certain flexibility and smoother surface is obtained.

Preferably, the stainless steel bus bar of step (1) comprises a 304 stainless steel bus bar.

Preferably, the 304 stainless steel bus comprises the following components in percentage by mass: c:0.042 to 0.048%, for example, 0.042%, 0.043%, 0.044%, 0.045%, 0.046%, 0.047% or 0.048%; cr: 18.3-18.6%, for example 18.3%, 18.4%, 18.5% or 18.6%; ni: 8.20-8.30%, for example 8.20%, 8.21%, 8.25%, 8.27%, 8.29% or 8.30%; mn:0.67 to 0.90%, for example, 0.67%, 0.69%, 0.70%, 0.72%, 0.75%, 0.80%, 0.85% or 0.90%; si:0.29 to 0.35%, for example, 0.29%, 0.30%, 0.31%, 0.34% or 0.35%; p is less than or equal to 0.032%, for example, 0.0032%, 0.0031%, 0.0030%, 0.0028%, 0.0025% or 0.0020%; s is less than or equal to 0.003%, for example, 0.003%, 0.002%, 0.001%, or 0.0005%; n is less than or equal to 0.008%, for example, 0.008%, 0.007%, 0.005%, 0.004%, 0.002% or 0.001%; the balance being Fe and unavoidable impurities.

Preferably, the strength of the 304 stainless steel bus bar is 720-780 MPa, for example, 720MPa, 730MPa, 740MPa, 750MPa, 760MPa, 770MPa or 780 MPa.

According to the invention, the strength of the 304 stainless steel bus is preferably 720-780 Mpa, the grain size of the bus can reach 7 +/-1 grade, and when the strength of drawing production is more than 1960Mpa, the 304 stainless steel bus has high torsion value and good toughness, and is beneficial to subsequent processing and forming, so that a steel wire rope product with high breaking tension is obtained.

Preferably, the elongation of the 304 stainless steel bus bar is 35% to 45%, for example, 35%, 37%, 49%, 40%, 42%, 44%, or 45%.

According to the invention, the elongation of the 304 stainless steel bus is preferably 35-45%, the grain size of the 304 stainless steel bus can reach 7 +/-1 grade, and when the strength of drawing production is more than 1960MPa, the 304 stainless steel bus has high torsion value and good toughness, is beneficial to subsequent processing and forming, and can obtain a steel wire rope product with high breaking tension.

The production method further preferably adopts the following silk diameter ratio: 0.39mm/0.35mm/0.28mm/0.35mm, and the main process of the wire drawing process comprises the following steps: 1.4 → 0.39mm, 1.2 → 0.35mm, 1.0mm → 0.28 mm.

Preferably, said drawing of step (1) comprises wet drawing.

Preferably, the oil temperature of the wet drawing is 45 ℃ or less, and may be, for example, 45 ℃, 44 ℃, 42 ℃, 40 ℃, 38 ℃, 35 ℃, 30 ℃ or 25 ℃.

Preferably, the third layer of filaments comprises a first third layer of filaments and a second third layer of filaments.

Preferably, the reduction ratio of the 304 stainless steel busbar by the wet drawing is 91.4 to 92.5%, and may be 91.4%, 91.8%, 92.0%, 92.1%, 92.3%, or 92.5%, for example.

According to the invention, the wet drawing is preferably carried out to ensure that the area reduction rate of the 304 stainless steel bus is 91.4-92.5%, if the area reduction rate is too low, the strength of the 304 stainless steel bus is reduced, and the breaking tension of the finally obtained steel wire rope product is reduced; if the surface reduction rate is too high, the toughness of the 304 stainless steel bus is poor, and the breaking force of the finally obtained steel wire rope product is reduced.

Preferably, after said wet drawing, the ratio of the diameter of the central filament, the second layer of filaments, the first third layer of filaments and the second third layer of filaments is 39:35:28: 35.

Preferably, the strength of the stainless steel wire is > 1960MPa, which may be e.g. 1960MPa, 1965MPa, 1970MPa, 1980MPa, 1990MPa or 2000 MPa.

Preferably, the stainless steel wire has a loop diameter > 15cm, and may be, for example, 16cm, 17cm, 18cm, 19cm, 20cm, 23cm, or 25 cm.

Preferably, the stainless steel wire is twisted more than 40 times, for example 41 times, 42 times, 43 times, 45 times, 48 times or 50 times.

Preferably, the wire distribution plate comprises 1 central hole, 6 second-layer positioning holes and 12 third-layer positioning holes.

Preferably, the material of the distribution plate comprises iron.

Preferably, the material of the central hole of the distribution plate, the material of the second layer of positioning holes and the material of the third layer of positioning holes respectively and independently comprise hard alloy steel.

The material of the central hole, the second layer of positioning holes and the third layer of positioning holes of the distributing plate preferably comprises hard alloy steel, but not iron and other materials, and the hard alloy steel has high hardness and strong wear resistance, so that the distributing plate is prevented from being damaged when a stainless steel wire passes through the distributing plate.

Preferably, the included angle between the central line of the second layer of positioning holes and the central line of the distributing plate is 60 degrees.

Preferably, the distance between the center of the second layer of positioning holes and the center of the distributing board is 34-40 mm, for example, 34mm, 35mm, 37mm, 38mm, 39mm or 40 mm.

The distance between the center of the second layer of positioning hole and the center of the distributing plate is preferably 34-40 mm, the included angle between the central wire and the second layer of wires, which penetrate through the positioning holes and enter the die, and the horizontal line is close to 50 degrees, so that the central wire and the second layer of wires are not staggered at the closing point of the die inlet, and the central strand is smoother.

Preferably, the included angle between the central line of the third layer of positioning holes and the central line of the distributing plate is 30 degrees.

Preferably, the distance between the center of the third layer of positioning holes and the center of the distributing plate is 44-50 mm, for example, 44mm, 45mm, 48mm, 49mm or 50 mm.

The naming of the center hole, the second layer positioning holes and the third layer positioning holes of the wire distribution plate in the invention is shown in fig. 1, wherein the center hole is named as 1, the second layer positioning holes are named as 2, 3, 4, 5, 6 and 7 in a clockwise mode from the north, the third layer positioning holes are named as 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 and 19 in a clockwise mode from the north, and the third layer positioning holes 8, 10, 12, 14, 16 and 18 are aligned with the second layer positioning holes 2, 3, 4, 5, 6 and 7 in a sequential mode.

Preferably, the six first-layer wires and the six second-layer wires penetrate through the third positioning holes in a staggered mode.

The six first-layer wire and the six second-layer wire alternately penetrate through the third positioning hole, namely the first-layer wire with the diameter of 0.35mm penetrates through the positioning hole 8, the second-layer wire with the diameter of 0.28mm penetrates through the positioning hole 9, the first-layer wire with the diameter of 0.35mm penetrates through the positioning hole 10, the second-layer wire with the diameter of 0.28mm penetrates through the positioning hole 11, and the like, or the second-layer wire with the diameter of 0.28mm penetrates through the positioning hole 8, the first-layer wire with the diameter of 0.35mm penetrates through the positioning hole 9, the second-layer wire with the diameter of 0.28mm penetrates through the positioning hole 10, and the first-layer wire with the diameter of 0.35mm penetrates through the positioning hole 11. The purpose that stainless steel wires with different diameters pass through the third positioning hole in a staggered mode is to enable the finally obtained steel wire rope product to be smooth in surface and convenient to use subsequently.

Preferably, the pore size of the first mold in the step (2) is 1.02-1.03 mm, such as 1.02mm, 1.022mm, 1.025mm, 1.027mm, 1.029mm or 1.03 mm.

Preferably, the bearing length of the first die is 0.7-1.7 mm, and may be, for example, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.5mm or 1.7 mm.

According to the invention, the length of the sizing belt of the first die is preferably 0.7-1.7 mm, and the deformation degree of the central strand can be controlled by controlling the length of the sizing belt of the first die, so that the reduction of the breaking tension of the obtained steel wire rope product caused by overlarge internal stress is avoided.

Preferably, the aperture size of the second mold in the step (3) is 1.502-1.518 mm, for example, 1.502mm, 1.505mm, 1.507mm, 1.509mm, 1.512mm, 1.515mm or 1.518 mm.

Preferably, the bearing length of the second die is 0.87-1.87 mm, for example, 0.87mm, 0.89mm, 0.91mm, 0.93mm, 1.00mm, 1.20mm, 1.40mm, 1.50mm or 1.87 mm.

According to the invention, the length of the bearing belt of the second die is preferably 0.87-1.87 mm, so that the obtained steel wire rope product has more stable dimensional accuracy and better surface quality.

Preferably, the outer material of the first and second dies each independently comprises a hard alloy steel.

Preferably, the cores of the first and second molds each independently comprise polycrystalline cores.

Preferably, the entry angles of the first and second dies are each independently 60 ° ± 3 °, for example 57 °, 58 °, 59 °, 60 °, 61 °, 62 ° or 63 °.

According to the invention, the entrance angles of the first die and the second die are preferably 60 degrees +/-3 degrees respectively, and the entrance angles are enlarged, so that the penetration of the second layer of wires and the third layer of wires can be more convenient, and the steel wire rope product with high breaking tension can be obtained.

Preferably, the compression zone angles of the first and second dies are each independently 45 ° ± 1 °, for example 44 °, 44.5 °, 45 °, 45.5 ° or 46 °.

Preferably, the exit angle of the first and second dies is each independently 53 ° ± 2 °, for example 51 °, 51.2 °, 52 °, 52.5 °, 53 °, 54 ° or 55 °.

Preferably, the twisting direction of the twisted rope in the step (3) is S twist.

Preferably, the lay length of the S lay is 10 to 11.5 times of the diameter of the twisted steel wire rope, for example, 10 times, 10.3 times, 10.4 times, 10.5 times, 10.7 times, 11 times or 11.5 times.

Preferably, the post-deformation stress-relief treatment of step (4) is performed using two sets of deformation devices.

Preferably, each set of said deforming means comprises a transverse deformer and a vertical deformer.

Preferably, the center-to-center distance between adjacent pulleys in the transverse deformer and the vertical deformer is 28-35 mm, and can be 28mm, 29mm, 30mm, 32mm, 33mm or 35 mm.

In the invention, the central distance between adjacent pulleys in the transverse deformer and the vertical deformer is controlled to be larger than the twisting distance of the twisted rope, and the preferred length is 28-35 mm.

The recitation of numerical ranges herein includes not only the above-recited values, but also any values between any of the above-recited numerical ranges not recited, and for brevity and clarity, is not intended to be exhaustive of the specific values encompassed within the range.

As a preferred technical scheme of the invention, the production method comprises the following steps:

(1) carrying out wet drawing on a 304 stainless steel bus with the strength of 720-780 MPa and the elongation of 35% -45% under the condition that the oil temperature is less than or equal to 45 ℃ and the surface reduction rate is 91.4-92.5% to obtain a stainless steel wire; the stainless steel wire is divided into a central wire, a second layer of wires and a third layer of wires; the third layer of filaments comprises a first layer of filaments and a second layer of filaments; after the wet drawing, the diameter ratio of the central wire, the second layer wire, the first layer wire and the second layer wire is 39:35:28: 35; the strength of the stainless steel wire is more than 1960MPa, the ring diameter is more than 15cm, and the twisting frequency is more than 40 times;

(2) the central wire, the six second-layer wires and the third-layer wire respectively penetrate through 1 central hole, 6 second-layer positioning holes and 12 third-layer positioning holes of the wire distributing plate, and the central wire and the second-layer wires enter a first die with the aperture size of 1.02-1.03 mm and the length of a sizing belt of 0.7-1.7 mm to be twisted and drawn to obtain a central strand; the material of the distributing plate comprises iron; the material of the central hole of the distributing board, the material of the second layer of positioning holes and the material of the third layer of positioning holes respectively and independently comprise hard alloy steel; the included angle between the center line of the second layer of positioning holes and the center line of the distributing plate is 60 degrees; the distance between the center of the second layer of positioning holes and the center of the distributing board is 34-40 mm; the included angle between the center line of the third layer of positioning holes and the center line of the distributing plate is 30 degrees; the distance between the center of the third layer of positioning hole and the center of the distributing board is 44-50 mm; the first layer of wires and the second layer of wires penetrate through third positioning holes in a staggered mode;

(3) the central strand and the third layer of silk enter a second die with the aperture size of 1.502-1.518 mm and the length of a bearing belt of 0.87-1.87 mm to be drawn and twisted rope with the twisting distance of 10-11.5 times of the diameter of the twisted steel wire rope and the twisting direction of S twist, so that the twisted steel wire rope is obtained; the outer materials of the first die and the second die respectively and independently comprise hard alloy steel; the cores of the first and second molds each independently comprise polycrystalline cores; the inlet angles of the first and second dies are each independently 60 ° ± 3 °; the compression zone angles of the first and second dies are each independently 45 ° ± 1 °; the exit angles of the first and second dies are each independently 53 ° ± 2 °;

(4) performing post-deformation stress relief treatment on the twisted steel wire rope to obtain a steel wire rope product; the post-deformation stress relief process is processed by using two groups of deformation devices; each group of deformation devices comprises a transverse deformer and a vertical deformer; the center distance between adjacent pulleys in the transverse deformer and the vertical deformer is 28-35 mm respectively and independently.

In a second aspect, the invention also provides a steel wire rope, which is prepared by the production method in the first aspect.

The steel wire rope has the advantages of large breaking force, high dimensional precision, certain flexibility and smoother surface, and can be used on brakes and speed changers of high-end fitness equipment and high-end bicycles/motorcycles, so that the steel wire rope has higher safety factor and longer service life.

Compared with the prior art, the invention has at least the following beneficial effects:

(1) the production method of the steel wire rope double-die drawing single-forming adopts a stainless steel bus with reasonable wire diameter ratio and certain quality requirement, and the stainless steel bus passes through the distributing plate and the two dies to obtain a steel wire rope product with higher breaking force, higher dimensional accuracy, certain flexibility and smoother surface, wherein the dimensional accuracy can reach less than +/-0.003 mm, and the breaking force can reach more than 3050N;

(2) the production method for the double-mold drawing single-forming of the steel wire rope, provided by the invention, is simple to operate, low in production cost and suitable for large-scale popularization and application.

Drawings

FIG. 1 is a front view of a coil separating plate in the production method of double-mold drawing single-forming of a steel wire rope.

FIG. 2 is a cross-sectional view of a coil separating plate, a first die and a second die in the production method of double-die drawing and single-forming of a steel wire rope.

FIG. 3 is a front view of a first die in the production method of double-die drawing single-forming of a steel wire rope.

In the figure: 1: a central bore; 2-7: a second layer of positioning holes; 8-19: a third layer of positioning holes; 20: a distributing board; 21: a first mold; 22: and a second mold.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.

Example 1

The embodiment provides a production method for double-die drawing and single-forming of a steel wire rope, which comprises the following steps:

(1) carrying out wet drawing on a 304 stainless steel bus with the diameters of 1.0mm, 1.2mm and 1.4mmm, the strength of 750MPa and the elongation of 40 percent (C:0.042 percent, Cr:18.6 percent, Ni:8.25 percent, Mn:0.69 percent, Si:0.30 percent, P:0.032 percent, S:0.003 percent, N:0.008 percent and the balance of Fe and inevitable impurities) under the condition of oil temperature of 40 ℃, wherein the stainless steel bus with the diameter of 1.0mm is subjected to 16-pass polycrystalline die drawing, the area reduction rate of the stainless steel bus is 92.2 percent, and the stainless steel bus is drawn into a stainless steel wire with the diameter of 0.28 mm; carrying out 16-pass polycrystalline die drawing on a 304 stainless steel bus with the diameter of 1.2mm, wherein the surface reduction rate is 91.5%, and drawing into a stainless steel wire with the diameter of 0.35 mm; carrying out 15-pass polycrystalline die drawing on a 304 stainless steel bus with the diameter of 1.4mm, wherein the surface reduction rate is 92.2%, and drawing into a stainless steel wire with the diameter of 0.39 mm; the stainless steel wire is divided into a central wire, a second layer of wires and a third layer of wires;

the strength of the stainless steel wire with the diameter of 0.28mm is 2150MPa, the ring diameter is 17cm, and the number of times of torsion is 62; the strength of the stainless steel wire with the diameter of 0.35mm is 2150MPa, the ring diameter is 25cm, the twisting frequency is 65 times, the strength of the stainless steel wire with the diameter of 0.39mm is 2100MPa, the ring diameter is 28cm, and the twisting frequency is 48 times;

(2) the central wire with the diameter of 0.39mm, the six second-layer wires with the diameter of 0.35mm and the third-layer wires respectively penetrate through a central hole, a second-layer positioning hole and a third-layer positioning hole of a wire distributing plate (shown in figures 1 and 2), and the central wire and the second-layer wires enter a first die (shown in figure 3) with the aperture size of 1.02mm and the length of a bearing belt of 1.2mm to be twisted and drawn to obtain a central strand; the distribution board is made of iron; the center hole of the distributing board, the second layer of positioning holes and the third layer of positioning holes are all made of hard alloy steel; the included angle between the center line of the second layer of positioning holes and the center line of the distributing plate is 60 degrees; the distance between the center of the second layer of positioning holes and the center of the distributing board is 36 mm; the included angle between the center line of the third layer of positioning holes and the center line of the distributing plate is 30 degrees; the distance between the center of the third layer of positioning holes and the center of the distributing board is 47 mm;

(3) step (2) the central strand and the third layer of silk enter a second die with the aperture size of 1.51mm and the length of a sizing zone of 1.37mm for drawing and twisting rope doubling with the twisting distance of 11 times 15mm of the diameter of the twisted steel wire rope and the twisting direction of S twisting to obtain the twisted steel wire rope; the outer materials of the first die and the second die are hard alloy steel; the mold cores of the first mold and the second mold are polycrystalline mold cores; the inlet angle of the first die is 60 °; the second die had an entrance angle of 62 ° and the first die had a compression zone angle of 46 °; the compression zone angle of the second die is 45 °; the exit angle of the first die is 53 °; the exit angle of the second die is 51 °; the third layer of filaments comprises six first layer of filaments with the diameter of 0.35mm and six second layer of filaments with the diameter of 0.28 mm; the six first-layer wires with the diameter of 0.35mm and the six second-layer wires with the diameter of 0.28mm penetrate through the third positioning holes in a staggered mode;

(4) performing post-deformation stress relief treatment on the twisted steel wire rope to obtain a steel wire rope product; the post-deformation stress relief process is processed by using two groups of deformation devices; each group of deformation devices comprises a transverse deformer and a vertical deformer; the center distance between adjacent pulleys in the transverse deformer and the vertical deformer is respectively and independently 30 mm.

Example 2

The embodiment provides a production method for double-die drawing and single-forming of a steel wire rope, which comprises the following steps:

(1) carrying out wet drawing on 304 stainless steel buses with diameters of 1.2mm, 1.4mm and 1.5mmm, strengths of 720MPa and elongations of 35% under the condition that the oil temperature is 45 ℃, wherein: carrying out 17-pass polycrystalline die drawing on a 304 stainless steel bus with the diameter of 1.2mm, wherein the surface reduction rate is 91.4%, and drawing into a stainless steel wire with the diameter of 0.34 mm; carrying out 17-pass polycrystalline die drawing on a 304 stainless steel bus with the diameter of 1.4mm, wherein the surface reduction rate is 92%, and drawing into a stainless steel wire with the diameter of 0.41 mm; carrying out 13-pass polycrystalline die drawing on a 304 stainless steel bus with the diameter of 1.5mm, wherein the surface reduction rate is 92%, and drawing into a stainless steel wire with the diameter of 0.44 mm; the stainless steel wire is divided into a central wire, a second layer of wires and a third layer of wires;

the strength of the stainless steel wire with the diameter of 0.34mm is 1980MPa, the ring diameter is 17cm, and the number of times of torsion is 42; the strength of the stainless steel wire with the diameter of 0.41mm is 2150MPa, the ring diameter is 15cm, the twisting frequency is 55 times, the strength of the stainless steel wire with the diameter of 0.44mm is 2050MPa, the ring diameter is 21cm, and the twisting frequency is 48 times;

(2) the central wire with the diameter of 0.44mm, six first-layer wires with the diameter of 0.41mm and the third-layer wires respectively penetrate through a central hole of a wire distributing plate, a second-layer positioning hole and a third-layer positioning hole, the central wire and the second-layer wires enter a first die with the aperture size of 1.025mm and the length of a bearing belt of 0.7mm to be twisted and drawn, and a central strand is obtained; the material of the distributing plate comprises iron; the material of the central hole of the distributing board, the material of the second layer of positioning holes and the material of the third layer of positioning holes respectively and independently comprise hard alloy steel; the included angle between the center line of the second layer of positioning holes and the center line of the distributing plate is 60 degrees; the distance between the center of the second layer of positioning holes and the center of the distributing board is 40 mm; the included angle between the center line of the third layer of positioning holes and the center line of the distributing plate is 30 degrees; the distance between the center of the third layer of positioning holes and the center of the distributing board is 44 mm;

(3) drawing the central strand and the third layer of filaments through a second die with the aperture size of 1.518mm and the length of a bearing belt of 0.87mm respectively, and twisting the twisted rope with the twisting distance 11.5 times of the diameter of the twisted steel wire rope and the twisting direction S to obtain the twisted steel wire rope; the outer materials of the first die and the second die are hard alloy steel; the mold cores of the first mold and the second mold are polycrystalline mold cores; the first die had an entrance angle of 59 °; the entrance angle of the second die is 63 ° and the compression zone angle of the first die is 44 °; the compression zone angle of the second die is 44.5 °; the exit angle of the first die was 53.5 °; the exit angle of the second die is 54 °; the third layer of filaments comprises six first layer of filaments with the diameter of 0.41mm and six second layer of filaments with the diameter of 0.34 mm; the six first-layer wires with the diameter of 0.41mm and the six second-layer wires with the diameter of 0.34mm penetrate through the third positioning holes in a staggered mode;

(4) performing post-deformation stress relief treatment on the twisted steel wire rope to obtain a steel wire rope product; the post-deformation stress relief process is processed by using two groups of deformation devices; each group of deformation devices comprises a transverse deformer and a vertical deformer; the center distance between adjacent pulleys in the transverse deformer and the vertical deformer is respectively and independently 28 mm.

Example 3

The embodiment provides a production method for double-die drawing and single-forming of a steel wire rope, which comprises the following steps:

(1) carrying out wet drawing on 304 stainless steel buses with diameters of 1.0mm, 1.2mm and 1.5mmm, strengths of 780MPa and elongations of 45% respectively under the condition that the oil temperature is 38 ℃, wherein: carrying out 16-pass polycrystalline die drawing on a 304 stainless steel bus with the diameter of 1.0mm, wherein the surface reduction rate is 92.2%, and drawing into a stainless steel wire with the diameter of 0.28 mm; carrying out 17-pass polycrystalline die drawing on a 304 stainless steel bus with the diameter of 1.2mm, wherein the surface reduction rate is 91.4%, and drawing into a stainless steel wire with the diameter of 0.34 mm; carrying out 13-pass polycrystalline die drawing on a 304 stainless steel bus with the diameter of 1.5mm, wherein the surface reduction rate is 92%, and drawing into a stainless steel wire with the diameter of 0.44 mm; the stainless steel wire is divided into a central wire, a second layer of wires and a third layer of wires;

the strength of the stainless steel wire with the diameter of 0.28mm, the strength of the stainless steel wire with the diameter of 0.34mm and the strength of the stainless steel wire with the diameter of 0.44mm are 2050MPa, the ring diameter is 26cm, and the twisting times are 44 times;

(2) the central wire with the diameter of 0.44mm, the six second-layer wires with the diameter of 0.34mm and the third-layer wires respectively penetrate through a central hole of a distributing board, a second-layer positioning hole and a third-layer positioning hole, and the central wire and the second-layer wires enter a first die with the aperture size of 1.03mm and the length of a sizing belt of 1.7mm to be twisted and drawn to obtain a central strand; the material of the distributing plate comprises iron; the material of the central hole of the distributing board, the material of the second layer of positioning holes and the material of the third layer of positioning holes respectively and independently comprise hard alloy steel; the included angle between the center line of the second layer of positioning holes and the center line of the distributing plate is 60 degrees; the distance between the center of the second layer of positioning holes and the center of the distributing board is 34 mm; the included angle between the center line of the third layer of positioning holes and the center line of the distributing plate is 30 degrees; the distance between the center of the third layer of positioning holes and the center of the distributing board is 50 mm;

(3) drawing the central strand and the third layer of filaments through a second die with the aperture size of 1.502mm and the length of a bearing belt of 1.87mm respectively, and twisting and rope combining with the twisting distance of 10 times of the diameter of the twisted steel wire rope and the twisting direction of S twisting to obtain the twisted steel wire rope; the outer materials of the first die and the second die are hard alloy steel; the mold cores of the first mold and the second mold are polycrystalline mold cores; the first die had an entrance angle of 57 °; the entrance angle of the second die is 63 ° and the compression zone angle of the first die is 44 °; the compression zone angle of the second die is 46 °; the exit angle of the first die was 53.5 °; the exit angle of the second die is 55 °; the third layer of filaments comprises six first-layer filaments with the diameter of 0.34mm and six second-layer filaments with the diameter of 0.28 mm; the six first-layer wires with the diameter of 0.34mm and the six second-layer wires with the diameter of 0.28mm penetrate through the third positioning holes in a staggered mode;

(4) performing post-deformation stress relief treatment on the twisted steel wire rope to obtain a steel wire rope product; the post-deformation stress relief process is processed by using two groups of deformation devices; each group of deformation devices comprises a transverse deformer and a vertical deformer; the center distance between adjacent pulleys in the transverse deformer and the vertical deformer is 35mm respectively and independently.

Example 4

The embodiment provides a production method for double-die drawing and single-forming of a steel wire rope, which is the same as that in the embodiment 1 except that in the step (1), "304 stainless steel buses with diameters of 1.0mm, 1.2mm and 1.4mmm, strengths of 750MPa and elongations of 40% are replaced by" 304 stainless steel buses with diameters of 0.8mm, strengths of 750MPa and elongations of 40%.

Example 5

The embodiment provides a production method for double-die drawing and single-forming of a steel wire rope, which is the same as that in the example 1 except that in the step (1), '304 stainless steel buses with diameters of 1.0mm, 1.2mm and 1.4mmm, strengths of 750MPa and elongations of 40% are replaced with' 304 stainless steel buses with diameters of 1.0mm, 1.2mm and 1.4mmm, strengths of 800MPa and elongations of 25%.

Example 6

The embodiment provides a production method for double-die drawing and single-forming of a steel wire rope, which is the same as that in the embodiment 1 except that the 'length of a bearing belt of a first die is 1.2 mm' in the step (3) is replaced by 'the length of the bearing belt of the first die is 2.1 mm'.

Example 7

This example provides a production method of double-die drawing single-shot forming of a steel wire rope, which is the same as that of example 1 except that "the length of the bearing of the first die is 1.2 mm" in step (3) is replaced with "the length of the bearing of the first die is 0.5 mm".

Example 8

This example provides a production method of a double die drawing single shot forming of a steel cord, which is the same as example 1 except that "the entrance angle of the first die is 60 °" is replaced with "the entrance angle of the first die is 45 °" in step (3).

Comparative example 1

This comparative example provides a method for producing a steel cord, which comprises the same steps as in example 1 except that the center strand does not pass through the first die and neither the center strand nor the third layer filaments enter the second die in step (3), but directly enter the stranding machine to twist the cord.

Comparative example 2

This comparative example provides a method of producing a steel wire rope, which is the same as in example 1 except that the step (2) is omitted, and a center filament having a diameter of 0.39mm, six second layer filaments having a diameter of 0.35mm, six first layer filaments having a diameter of 0.35mm, and six second layer filaments having a diameter of 0.28mm are simultaneously passed through a distribution plate into a second die.

The actual breaking force of the steel wire rope products obtained in the above examples and comparative examples was measured by using the method for measuring the actual breaking force of the steel wire rope of GB/T8358, and the results are shown in Table 1.

TABLE 1

	Dimensional accuracy (mm)	Breaking force (N)	Whether the surface is smooth or not
				Example 1	±0.001	3695	Is that
Example 2	±0.003	3325	Is that
				Example 3	±0.002	3275	Is that
Example 4	±0.002	2865	Is that
				Example 5	±0.002	3050	Is that
Example 6	±0.001	3573	Is that
				Example 7	±0.001	3645	Is that
Example 8	±0.001	3450	Is that
				Comparative example 1	±0.005	2700	Whether or not
Comparative example 2	±0.003	3057	Whether or not

As can be seen from table 1:

(1) it can be seen from the comprehensive examples 1 to 8 that the steel wire rope product obtained by the production method of the steel wire rope double-mold drawing single-forming provided by the invention has high dimensional precision, large breaking force and smooth surface, wherein the dimensional precision can reach less than +/-0.003 mm, and the breaking force can reach more than 3050N;

(2) it can be seen from the combination of the examples 1 and 4 that the 304 stainless steel bus bars with diameters of 1.0mm, 1.2mm and 1.4mmm, strength of 750MPa and elongation of 40% are adopted in the example 1, and compared with the 304 stainless steel bus bars with diameters of 0.8mm, 750MPa and elongation of 40% adopted in the example 4, the bus bars are drawn into the stainless steel wires with diameters of 0.28mm, 0.35mm and 0.39mm respectively in the examples 1 and 4, so that the surface reduction rate of the wet drawing in the example 4 is not within the range of the preferred surface reduction rate of 91.4-92.5%, and the breaking tension of the finally obtained steel wire rope product is only 2865N and is far lower than that of the breaking tension of 3695N in the example 1; therefore, the invention further limits the surface reduction rate of the stainless steel bus to be within a specific range, and can ensure that the obtained steel wire rope product has larger breaking tension;

(3) it can be seen from the combination of the examples 1 and 5 that, in the example 1, the 304 stainless steel bus bars with diameters of 1.0mm, 1.2mm and 1.4mmm, respectively, strength of 750MPa and elongation of 40% are adopted, and compared with the 304 stainless steel bus bars with diameters of 1.0mm, 1.2mm and 1.4mmm, respectively, strength of 800MPa and elongation of 25% adopted in the example 5, the strength of the 304 stainless steel bus bars with different diameters in the example 5 is higher than that of the example 1, and as the strength of the 304 stainless steel bus bars is increased, the elongation thereof is reduced, and is 25% in the example 5, which is lower than that of the example 1, the breaking tension of the finally obtained steel wire rope product is greatly reduced to 3050N and is far lower than that of 3695N in the example 1; therefore, the strength and the elongation of the stainless steel bus are further limited within a specific range, and the obtained steel wire rope product can be ensured to have larger breaking tension;

(4) it can be seen from the combination of the embodiment 1 and the embodiments 6 to 7 that the length of the bearing of the first die in the embodiment 1 is 1.2mm, and compared with the lengths of the bearing of the first die in the embodiments 6 to 7 of 2.1mm and 0.5mm, the dimension precision of the steel wire rope products obtained in the embodiments 6 to 7 is the same as that of the embodiment 1, the surface is smooth, and only the breaking tension is slightly reduced compared with the embodiment 1; therefore, the length of the bearing band of the first die is further limited within a specific range, and the breaking tension of the finally obtained steel wire rope product can be improved;

(5) by combining the example 1 and the example 8, it can be seen that the entrance angle of the first die in the example 1 is 60 °, and compared with the entrance angle of the first die in the example 8 being 45 °, the dimensional accuracy of the steel wire rope product obtained in the example 8 is the same as that of the example 1, and is ± 0.001mm, but the breaking tension is 3450N, which is smaller than that of the example 1; therefore, the entrance angle of the first die is further limited within a specific range, and the obtained steel wire rope product can be ensured to have larger breaking tension;

(6) it can be seen from the combination of the example 1 and the comparative examples 1-2 that, in the example 1, the central strand passes through the first die, the central strand and the third layer of filaments enter the second die, i.e. the double-die drawing process, compared with the comparative example 1, in which the central strand does not pass through the first die, and neither the central strand nor the third layer of filaments enter the second die, i.e. the die-free process, and the comparative example 2, in which the central filament and the second layer of filaments do not enter the first die to form the central strand, and directly enter the second die together with the third layer of filaments, i.e. the single-die drawing process, the steel wire rope product obtained in the example 1 has high dimensional accuracy, large breaking tension and smooth surface, while the steel wire rope product obtained in the comparative example 1 has low dimensional accuracy of ± 0.005mm, the breaking tension is only 2700N, the surface is not smooth, and the dimensional accuracy and the breaking tension of the steel wire rope obtained in the comparative example 2 are improved compared with the comparative example 1, but still lower than the data of example 1 and the surface of the steel cord is not smooth; therefore, the steel wire rope product with high dimensional precision, large breaking force and smooth surface can be obtained by adopting the double-die drawing process.

In conclusion, the production method for the double-die drawing single-forming of the steel wire rope adopts the stainless steel bus with reasonable wire diameter ratio and certain quality requirement, and the stainless steel bus passes through the distributing board and the two dies to obtain the steel wire rope product with higher breaking force, higher dimensional accuracy, certain flexibility and smoother surface; and the production method is simple to operate, low in production cost and suitable for large-scale popularization and application.

The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.