High strength steel wire rope and method of making same

Abstract

The application discloses a high-strength steel wire rope and a preparation method thereof, and belongs to the technical field of steel wire ropes, and has the technical scheme as follows: a high-strength steel wire rope comprises a center rope core and a plurality of outer layer strands twisted around the periphery of the center rope core; each of the outer layer strands comprises, from inside to outside, a center wire, a plurality of inner layer wires and a plurality of outer layer wires; and the gaps between the inner layer wires and the outer layer wires are filled with filler wires; the center rope core is a synthetic fiber core, the tensile force of the synthetic fiber core is greater than 2000 N, and the oil content is 6-10%; the diameter of the steel wire rope is 8.10-8.30 mm, the breaking tension is greater than or equal to 37.4 KN, and the strength is 1770 MPa grade; the steel wire rope has the effect of meeting the use requirements of a machine room-less elevator and having a wide application prospect by improving the performance of the rope core and the structure of the steel wire rope and under the premise of reducing the cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel wire rope, in particular to a high-strength steel wire rope and a preparation method thereof. BACKGROUND

[0002] The steel wire rope is a spiral body twisted by steel wires according to a certain rule, has the advantages of good flexibility, strong load bearing capacity, stable transmission, strong wear resistance, light weight, unique spiral structure and the like, and is widely used in fields of elevators, ship transportation, mine machinery, ocean engineering, aerospace and the like. The steel wire rope plays an important role in the work of the elevator and is one of important components of the elevator. The existing steel wire rope for the elevator is generally used in the medium and high-rise building machine room, and in the low-rise elevator without the machine room, due to the limited space, the adjustment device for the steel wire rope in the elevator has certain defects and deficiencies compared with the machine room, so the stability of the overall performance of the steel wire rope is required to be higher in the low-rise elevator without the machine room.

[0003] In view of the use environment of the elevator without the machine room, the steel wire rope needs to provide excellent wear resistance and bending fatigue resistance while ensuring lower and more stable elongation. The existing steel wire rope for the elevator in the industry generally adopts the structure of 8×19S, the core is a natural fiber core or a steel core, the strength level is 1370 / 1770MPa or 1620 / 1770MPa, wherein the 19S structure steel wire rope has low flexibility at the high strength of 1770MPa, which affects the installation and bending fatigue resistance. The natural fiber core has excellent oil storage performance and good support, but the diameter uniformity is poor, the local core linear density is uneven, the performance is greatly affected by environmental factors, and the elongation performance consistency of the elevator rope is affected; the steel core has high strength and good stability, but the oil content is less (2-3%), which increases the maintenance cost of the elevator in use and shortens the maintenance period, and the steel core rope has too large self-weight and too high manufacturing cost. SUMMARY

[0004] In order to solve the problems of the existing steel wire rope for the elevator, the present application provides a high-strength steel wire rope and a preparation method thereof, which aims to design a 6×25F-SFC high-strength synthetic fiber core steel wire rope with a strength level of 1770MPa, improve the core performance and the structure of the steel wire rope, meet the use requirements of the elevator without the machine room under the premise of reducing the cost, and have wide application prospects.

[0005] The first aspect of the present application provides a high-strength steel wire rope, which adopts the following technical scheme:

[0006] A high-strength steel wire rope, comprising a center core and a plurality of outer strands twisted around the center core, the structure of the steel wire rope is 6×25F-SFC, each of the outer strands comprises a center wire, six inner layer wires and twelve outer layer wires from inside to outside, and the gaps between the inner layer wires and the outer layer wires are filled with six filling wires.

[0007] The center rope core is a synthetic fiber core, the synthetic fiber core has a tension >2000N and an oil content of 6-10%, and the synthetic fiber core raw material comprises polypropylene, polyethylene and a reinforcing agent, wherein the weight ratio of polypropylene to polyethylene is 5:5, and the reinforcing agent is polyvinylamide, and the amount of the reinforcing agent is 2±0.5% of the total weight of polypropylene and polyethylene;

[0008] The steel wire rope has a diameter of 8.10-8.30mm, a breaking tension ≥37.4KN and a strength of 1770MPa.

[0009] Preferably, the steel wire rope has a lay length of 49.0-52.0mm, an unroundness <3% and a roundness >99%, the steel wire rope has a right alternate lay, and the center wire has a strength ≥1770MPa.

[0010] Preferably, the center wire has a diameter of 0.65±0.01mm, the inner layer wire and the outer layer wire each have a diameter of 0.53±0.01mm, and the filling wire has a diameter of 0.22±0.01mm.

[0011] Preferably, the synthetic fiber core has a nominal diameter of 4.30mm, a diameter allowable deviation of 4.20-4.40mm and a linear density of 11-12g / m.

[0012] The second aspect of the application provides a preparation method of a high-strength steel wire rope, comprising the following steps:

[0013] wire rod inspection, pickling and phosphating surface treatment, rough drawing, heat treatment process, water tank drawing, strand twisting, rope combining, and inspection; wherein the heat treatment process is as follows:

[0014] The furnace temperature from feeding to discharging is 950±5℃, 935±5℃, 920±5℃, 905±5℃ and 890±5℃ in sequence, and the DV value is 65.

[0015] In the rope combining process, the pre-deformer wheel pitch is 0.86-0.88 times the steel wire rope lay length, the deformer pressure is 1.5-1.6 times the steel wire rope diameter, the rope combining straightening wheel pressure is 1.0-1.2 times the steel wire rope diameter, the rope combining straightening wheel pitch is 1.6-1.7 times the steel wire rope lay length, and the design pre-warning is that when the pre-tension design is 12.4-12.6KN, the minimum value of the steel wire rope diameter is 7.85mm and the maximum value of the steel wire rope diameter is 8.10mm.

[0016] Preferably, in the rough drawing process, the center wire is drawn from a wire rod of 5.50mm to 1.98mm, and the diameter deviation is 0-0.03mm.

[0017] The outer layer wire and the inner layer wire are drawn from a 5.50 mm rod to 1.85 mm, with a diameter deviation of 0-0.03 mm;

[0018] The filling wire is drawn from a 5.50 mm rod to 0.92 mm, with a diameter deviation of 0-0.02 mm.

[0019] Preferably, the chemical composition of the rod for the center wire, the outer layer wire and the inner layer wire is as follows in terms of percentage by weight: C 0.52-0.60%, S≤0.035%, P≤0.035%, Si 0.17-0.37%, Mn 0.50-0.80%, with the balance being iron and inevitable impurity elements.

[0020] The chemical composition of the rod for the filling wire is as follows in terms of percentage by weight: C 0.42-0.50%, S≤0.035%, P≤0.035%, Si 0.17-0.37%, Mn 0.50-0.80%, with the balance being iron and inevitable impurity elements.

[0021] Preferably, in the water tank drawing process, the diameter of the center wire is drawn from 1.98 mm to 0.65 mm, with a diameter deviation of ±0.01 mm.

[0022] The diameter of the outer layer wire and the inner layer wire is drawn from 1.85 mm to 0.53 mm, with a diameter deviation of ±0.01 mm.

[0023] The diameter of the filling wire is drawn from 0.92 mm to 0.22 mm, with a diameter deviation of ±0.01 mm.

[0024] Preferably, in the strand twisting process, the outer layer strand has a diameter of 2.60 mm, with a diameter deviation of ±0.03 mm, the twisting pitch is 8.5 times ±1.5% of the diameter of the outer layer strand (i.e. 21.7-22.4 mm), and the rear straightening device is provided with 6 groups.

[0025] Preferably, the rear straightening device in the rope combining process is provided with 6 groups.

[0026] In summary, the present application has the following advantages:

[0027] (2) The steel wire rope obtained by the present application has a 6×25F-SFC structure and a strength grade of 1770 MPa, has the advantages of wear resistance, bending fatigue resistance, low elongation and stable performance, is suitable for the use environment of a machine room-less elevator, and has more excellent elongation performance and structural stability than an 8-strand steel wire rope;

[0028] (2) The combination of synthetic fiber core and outer strand of 6×25F structure improves the overall stability of wire rope. At the same time, synthetic fiber core has the advantages of high strength, high toughness, low elongation, uniform linear density, excellent fiber density, and strong environmental adaptability.

[0029] (3) Set the temperatures of the five heating zones of the heating furnace from the feeding zone to the discharging zone to 950±5℃, 935±5℃, 920±5℃, 905±5℃ and 890±5℃ respectively. At the same time, when the DV value is controlled to 65, while ensuring production efficiency, ensure the heat treatment effect of the center wire, inner layer wire, outer layer wire and filler wire, so that the sorbitization rate of the center wire, inner layer wire, outer layer wire and filler wire reaches more than 95%, and ensure that the wire rope has the advantages of wear resistance, bending fatigue resistance and stable performance.

[0030] (4) In this application, by optimizing the diameter of the center wire, inner wire and outer wire of the outer strand of the wire rope, the production cost of the wire rope is reduced while meeting the performance requirements of the wire rope used in machine room-less elevators. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the cross-sectional structure of the 6×25F-SFC-8mm steel wire rope of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Outer layer filament; 2. Inner layer filament; 3. Core filament; 4. Filler filament; 5. Synthetic fiber core. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings.

[0035] A high-strength steel wire rope, its structure being 6×25F-SFC, such as... Figure 1 As shown, it specifically includes a central rope core made of synthetic fiber core 5 and six outer strands twisted around the central rope core. The six outer strands cover the synthetic fiber core 5. Each outer strand includes, from the inside out, a central filament 3, an inner filament 2, and an outer filament 1. There is one central filament 3, and multiple inner filaments 2 and outer filaments 1. Specifically, six inner filaments 2 are arranged around the central filament 3, and the surface of the inner filament 2 abuts against the surface of the central filament 3. Twelve outer filaments 1 are arranged around the multiple inner filaments 2, and the surface of the outer filament 1 abuts against the surface of the inner filament 2. Six filler filaments 4 are filled in the gaps between the inner filaments 2 and the outer filaments 1.

[0036] The diameter of the center filament is 0.65±0.01mm, the diameters of the inner and outer filaments are both 0.53±0.01mm, and the diameter of the filler filament is 0.22±0.01mm.

[0037] The wire rod for the center wire, the inner layer wire and the outer layer wire has a nominal diameter of 5.50 mm, the allowable deviation of the diameter is ±0.30 mm, the chemical composition of the wire rod is C 0.52-0.60%, S≤0.035%, P≤0.035%, Si 0.17-0.37%, Mn 0.50-0.80% by weight, and the balance is iron and inevitable impurity elements; the tensile strength of the wire rod is ≥800 MPa, the elongation is ≥8%, the reduction of area is ≥35%, the decarburization layer depth of the wire rod is ≤2.0%D, and there should be no quenching structure in the wire rod which affects the use.

[0038] The wire rod for the filling wire has a nominal diameter of 5.50 mm, the allowable deviation of the diameter is ±0.30 mm, the chemical composition of the wire rod is C 0.42-0.50%, S≤0.035%, P≤0.035%, Si 0.17-0.37%, Mn 0.50-0.80% by weight, and the balance is iron and inevitable impurity elements, the tensile strength of the wire rod is ≥750 MPa, the elongation is ≥8%, the reduction of area is ≥40%, the decarburization layer depth of the wire rod is ≤2.0%D, and there should be no quenching structure in the wire rod which affects the use.

[0039] The synthetic fiber core is purchased from Tianjin Mingli Metal Wire Rope Products Co., Ltd., and the specific performance of the synthetic fiber core is as follows: the nominal diameter of the synthetic fiber core is 4.30 mm, the allowable deviation of the diameter is ±0.10 mm, the oil content is 6-10%, the linear density is 11-12 g / m, the breaking tension is >2000 N, the twisting direction is left alternately, and the twisting pitch is ≤3.3 times. The raw material of the synthetic fiber core includes polypropylene, polyethylene and a reinforcing agent, wherein the weight ratio of polypropylene to polyethylene is 5:5, the reinforcing agent is polyvinylamide, and the amount of the reinforcing agent is 2±0.5% of the total weight of polypropylene and polyethylene. The oiling mode of the synthetic fiber core is 2-strand single wire oiling, wherein the oil used has a kinematic viscosity (100℃) ≥25 mm 2 / s, a drop point ≥70℃, an acid value ≤0.35 mg KOH / g, and an appearance of yellow uniform paste.

[0040] Example 1

[0041] A preparation method of a high-strength steel wire rope, comprising the following steps

[0042] (1) wire rod inspection;

[0043] (2) pickling and phosphating surface treatment;

[0044] (3) rough drawing: the center wire is drawn from a 5.50 mm wire rod to 1.98 mm, the diameter deviation is 0-0.03 mm, and the process line deviation is ±0.03 mm;

[0045] The outer layer wire and the inner layer wire are drawn from a 5.50 mm rod to 1.85 mm, with a diameter deviation of 0-0.03 mm and a process line deviation of ±0.03 mm;

[0046] The filling wire is drawn from a 5.50 mm rod to 0.92 mm, with a diameter deviation of 0-0.02 mm and a process line deviation of ±0.03 mm;

[0047] (4) Heat treatment process: after the rough drawing process, the center wire, the inner layer wire, the outer layer wire and the filling wire enter the heating furnace, and the temperature of the five heating zones of the heating furnace is set from the feeding zone to the discharging zone as 950℃, 935℃, 920℃, 905℃, 890℃, while the DV value is controlled to be 65;

[0048] (5) Water tank drawing: after the heat treatment process, the center wire diameter is drawn from 1.98 mm to 0.65 mm, with a diameter deviation of ±0.01 mm and a process line deviation of ±0.02 mm;

[0049] The outer layer wire and the inner layer wire are drawn from 1.85 mm to 0.53 mm, with a diameter deviation of ±0.01 mm and a process line deviation of ±0.02 mm;

[0050] The filling wire is drawn from 0.92 mm to 0.22 mm, with a diameter deviation of ±0.01 mm and a process line deviation of ±0.02 mm;

[0051] (6) Strand twisting process: one center wire, six inner layer wires, twelve outer layer wires and six filling wires are matched to form an outer layer strand with a strand diameter of 2.60 mm, and the outer layer strand diameter is allowed to deviate by ±0.03 mm, and the twisting pitch is 21.7 mm, and after twisting, straightening is performed, and the straightening device is provided with six groups;

[0052] (7) Rope combining process, the outer layer strand obtained in the strand twisting process is combined with the synthetic fiber core, and the nominal diameter of the steel wire rope is designed to be 8 mm, and the twisting pitch is 49.0 mm, wherein:

[0053] The pre-deformer wheel pitch is 0.86 times the steel wire rope twisting pitch;

[0054] The deformer pressure is 1.5 times the diameter of the steel wire rope;

[0055] The rope straightening wheel pressure is 1.0-1.2 times the diameter of the steel wire rope;

[0056] The rope straightening wheel pitch is 1.6 times the steel wire rope twisting pitch;

[0057] Design warning: under the tension of 12.4-12.6KN, the minimum diameter of the steel wire rope is 7.85mm, and the maximum diameter of the steel wire rope is 8.10mm, the diameter of the steel wire rope is monitored in real time by using a laser diameter measuring instrument, and an alarm is prompted when the diameter exceeds the allowed range, and the operator should detect and adjust the diameter of the steel wire rope, strand diameter, etc.; straightening after twisting, the straightening device is provided with six groups;

[0058] (8) Product inspection, the twisting direction of the steel wire rope is right alternating twist, the twisting is uniform, tight and not loose, the steel wire in the steel wire rope should not have defects such as overlapping, bending and broken wire, the surface of the steel wire rope should be flat, and uniform gaps are allowed;

[0059] (9) Packaging and warehousing.

[0060] Example 2

[0061] A method for preparing a high-strength steel wire rope, comprising the following steps

[0062] (1) Wire rod inspection;

[0063] (2) Acid pickling and phosphating surface treatment;

[0064] (3) Rough drawing: the center wire is drawn from a 5.50mm wire rod to 1.98mm, the diameter deviation is 0-0.03mm, and the process line deviation is ±0.03mm;

[0065] The outer layer wire and the inner layer wire are drawn from a 5.50mm wire rod to 1.85mm, the diameter deviation is 0-0.03mm, and the process line deviation is ±0.03mm;

[0066] The filling wire is drawn from a 5.50mm wire rod to 0.92mm, the diameter deviation is 0-0.02mm, and the process line deviation is ±0.03mm; (4) Heat treatment process: after the rough drawing process, the center wire, the inner layer wire, the outer layer wire and the filling wire enter the heating furnace, the temperature of the five heating zones of the heating furnace is set from the feeding zone to the discharging zone as 955℃, 930℃, 925℃, 905℃, 895℃, and the DV value is controlled to be 65;

[0067] (5) Water tank drawing: after the heat treatment process, the center wire diameter is drawn from 1.98mm to 0.65mm, the diameter deviation is ±0.01mm, and the process line deviation is ±0.02mm;

[0068] The diameter of the outer layer wire and the inner layer wire is drawn from 1.85mm to 0.53mm, the diameter deviation is ±0.01mm, and the process line deviation is ±0.02mm;

[0069] The diameter of the filling wire is drawn from 0.92mm to 0.22mm, the diameter deviation is ±0.01mm, and the process line deviation is ±0.02mm;

[0070] (6) Stranded rope twisting process: one center wire, six inner layer wires, twelve outer layer wires and six filler wires are matched to form an outer layer strand with a strand diameter of 2.60 mm, the outer layer strand diameter tolerance is ±0.03 mm, the twisting pitch is 22.0 mm, and after twisting, straightening is performed, and the straightening device is provided with six groups;

[0071] (7) Rope combining process, the outer layer strand obtained in the stranded rope twisting process is combined with the synthetic fiber core, and the designed nominal diameter of the steel wire rope is 8 mm, and the twisting pitch is 51 mm, wherein:

[0072] The pre-deformer wheel pitch is 0.86 times the steel wire rope twisting pitch;

[0073] The deformer pressure is 1.5 times the steel wire rope diameter;

[0074] The rope straightening wheel pressure is 1.0-1.2 times the steel wire rope diameter;

[0075] The rope straightening wheel pitch is 1.6 times the steel wire rope twisting pitch;

[0076] The design warning: under the tension of 12.4-12.6 KN, the minimum value of the steel wire rope diameter is 7.85 mm, and the maximum value of the steel wire rope diameter is 8.10 mm, the laser diameter measuring instrument is used to monitor the steel wire rope diameter in real time, and when the diameter exceeds the allowable range, an alarm is given, and the operator should detect and adjust the steel wire rope diameter, strand diameter, etc.; after twisting, straightening is performed, and the straightening device is provided with six groups;

[0077] (8) Product inspection, the steel wire rope twisting direction is right alternating twist, the twisting is uniform, tight and not loose, the steel wire rope inner steel wire does not have defects such as stagger, bending and broken wire, the steel wire rope strand and the rope surface should be flat, and uniform gaps are allowed;

[0078] (9) Packaging and storage.

[0079] Example 3

[0080] A preparation method of a high-strength steel wire rope, comprising the following steps

[0081] (1) Wire rod inspection;

[0082] (2) Acid pickling and phosphating surface treatment;

[0083] (3) Rough drawing: the center wire is drawn from a 5.50 mm wire rod to 1.98 mm, the diameter deviation is 0-0.03 mm, and the process line deviation is ±0.03 mm;

[0084] The outer layer wire and the inner layer wire are drawn from a 5.50 mm wire rod to 1.85 mm, the diameter deviation is 0-0.03 mm, and the process line deviation is ±0.03 mm;

[0085] The filling wire is drawn from 5.50 mm of the rod to 0.92 mm, the diameter deviation is 0-0.02 mm, and the process line deviation is ±0.03 mm;(4) heat treatment process: the center wire, the inner layer wire, the outer layer wire and the filling wire after the rough drawing process enter the heating furnace, the temperature of the five heating zones of the heating furnace is set from the feeding zone to the discharging zone as 945℃, 940℃, 915℃, 910℃, 885℃ in turn, while the DV value is controlled to be 65;

[0086] (5) water tank drawing: after the heat treatment process, the center wire diameter is drawn from 1.98 mm to 0.65 mm, the diameter deviation is ±0.01 mm, and the process line deviation is ±0.02 mm;

[0087] The outer layer wire and the inner layer wire are drawn from 1.85 mm to 0.53 mm, the diameter deviation is ±0.01 mm, and the process line deviation is ±0.02 mm;

[0088] The filling wire is drawn from 0.92 mm to 0.22 mm, the diameter deviation is ±0.01 mm, and the process line deviation is ±0.02 mm;

[0089] (6) strand twisting process: one center wire, six inner layer wires, twelve outer layer wires and six filling wires are matched to form an outer layer strand with a strand diameter of 2.60 mm, the outer layer strand diameter allows deviation of ±0.03 mm, the twisting pitch is 22.4 mm, and after twisting, straightening is performed, and the straightening device is provided with six groups;

[0090] (7) rope combining process, the outer layer strand obtained in the strand twisting process is combined with the synthetic fiber core, the nominal diameter of the steel wire rope is designed to be 8 mm, and the twisting pitch is 52.0 mm, wherein:

[0091] The pre-deformer wheel pitch is 0.88 times the steel wire rope twisting pitch;

[0092] The deformer pressure is 1.6 times the steel wire rope diameter;

[0093] The rope straightening wheel pressure is 1.0-1.2 times the steel wire rope diameter;

[0094] The rope straightening wheel pitch is 1.7 times the steel wire rope twisting pitch;

[0095] Design early warning: under the tension of 12.4-12.6 KN, the minimum value of the steel wire rope diameter is 7.85 mm, and the maximum value of the steel wire rope diameter is 8.10 mm, the laser diameter measuring instrument is used to monitor the steel wire rope diameter in real time, and when the diameter exceeds the allowable range, an alarm is given, and the operator should detect and adjust the steel wire rope diameter, strand diameter, etc.; after twisting, straightening is performed, and the straightening device is provided with six groups;

[0096] (8) Final inspection, the steel wire rope lay direction is right alternating lay, lay uniform, tight, not loose, the steel wire in the steel wire rope should not have staggered, bending and broken wire defects, the steel wire rope strand and rope surface should be flat, allow to have uniform gap;

[0097] (9) Packaging and storage.

[0098] Comparative Example 1

[0099] The difference from Example 1 is that the natural fiber core is used instead of the synthetic fiber core, and the other steps are the same as Example 1, wherein the natural fiber core is prepared from sisal, the diameter is 4.2 mm, the diameter deviation is 4.10-4.40 mm, the linear density is 13-14 g / m, the oil content is 10-14%, and the tensile force is >1290 N.

[0100] Comparative Example 2

[0101] The difference from Example 1 is that in the heat treatment process, the temperature of the five heating zones of the heating furnace is set from the feeding zone to the discharging zone as 940℃, 925℃, 910℃, 895℃, 880℃, and the other steps are the same as Example 1.

[0102] Comparative Example 3

[0103] The difference from Example 1 is that in the rope combining process:

[0104] The pre-deformer wheel pitch is 0.80 times the steel wire rope lay pitch;

[0105] The deformer reduction is 1.3 times the steel wire rope diameter;

[0106] The rope combining straightening wheel reduction is 0.8-0.9 times the steel wire rope diameter;

[0107] The rope combining straightening wheel pitch is 1.4 times the steel wire rope lay pitch, and the other steps are the same as Example 1.

[0108] Comparative Example 4

[0109] The difference from Example 1 is that in the rope combining process:

[0110] The pre-deformer wheel pitch is 0.90 times the steel wire rope lay pitch;

[0111] The deformer reduction is 1.7 times the steel wire rope diameter;

[0112] The rope combining straightening wheel reduction is 1.3-1.4 times the steel wire rope diameter;

[0113] The rope combining straightening wheel pitch is 1.8 times the steel wire rope lay pitch, and the other steps are the same as Example 1.

[0114] Performance test

[0115] The steel wire rope obtained in the above embodiment is subjected to performance detection according to the provisions in GB / T 8903-2018 "Steel wire rope for elevators", and the detection results are shown in the following table.

[0116] Table 1 Detection results of each steel wire of the outer layer strand after drawing of the water tank

[0117]

[0118] Table 2 Steel wire rope performance detection results table

[0119]

[0120] Among them, the bending fatigue test is to see the number of broken wires after 600,000 times of bending.

[0121] As can be seen from Table 2, the steel wire ropes obtained in Examples 1-3 of the present application have a breaking force >40KN, and the elastic elongation and structural elongation are relatively low. No broken wire occurs after 600,000 times of bending, and the diameter uniformity of the steel wire ropes obtained in the present application is good, the roundness is greater than 99%, the out-of-roundness is within 3%, and the performance stability is good.

[0122] When the natural fiber core is replaced by the synthetic fiber core, the elastic elongation, structural elongation, bending fatigue performance, roundness and out-of-roundness of the steel wire rope obtained in Comparative Example 1 are all worse than those in Example 1, which shows that the performance of the steel wire rope obtained in the present application is more stable.

[0123] Comparative Examples 2-4 and Example 1, when the furnace temperature in the heat treatment process and the parameters in the rope combining process are not within the range defined in the present application, the elastic elongation, structural elongation, bending fatigue performance, roundness and out-of-roundness of the steel wire ropes obtained are all worse than those in Example 1, which shows that by adjusting the process parameters in the heat treatment process and the rope combining process, the bending fatigue resistance and the uniformity of the steel wire rope with a structure of 6×25F-SFC can be effectively guaranteed.

[0124] The embodiments of the specific embodiment are preferred embodiments of the present application, but do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A method of making a high strength steel wire rope, characterized by: It comprises the following steps: Wire rod inspection, pickling and phosphating surface treatment, rough drawing, heat treatment process, water tank drawing, strand twisting, rope twisting, inspection; wherein the heat treatment process is: The furnace temperature from the feeding to the discharging is 950±5℃, 935±5℃, 920±5℃, 905±5℃, 890±5℃ in turn, and the DV value is 65; In the rope twisting process: the wheel pitch of the pre-deformer is 0.86-0.88 times of the steel wire rope twisting pitch, the deformation amount of the deformer is 1.5-1.6 times of the steel wire rope diameter, the wheel deformation amount of the rope straightening wheel is 1.0-1.2 times of the steel wire rope diameter, the wheel pitch of the rope straightening wheel is 1.6-1.7 times of the steel wire rope twisting pitch, and the design early warning is that when the pre-tension is designed as 12.4-12.6 KN, the minimum value of the steel wire rope diameter is 7.85 mm and the maximum value of the rope diameter is 8.10 mm; The steel wire rope comprises a center rope core and a plurality of outer layer strands twisted around the center rope core, characterized in that the structure of the steel wire rope is 6×25F-SFC, each of the outer layer strands comprises a center wire, six inner layer wires and twelve outer layer wires from inside to outside, and the gaps between the inner layer wires and the outer layer wires are filled with six filling wires; The center rope core is a synthetic fiber core, the tensile force of the synthetic fiber core is greater than or equal to 2000 N, the oil content is 6-10%, and the raw material of the synthetic fiber core comprises polypropylene, polyethylene and a reinforcing agent, wherein the weight ratio of polypropylene to polyethylene is 5:5, the reinforcing agent is polyvinylamide, and the amount of the reinforcing agent is 2±0.5% of the total weight of polypropylene and polyethylene. The diameter of the steel wire rope is 8.10-8.30 mm, the breaking tension is greater than or equal to 37.4 KN, and the strength is 1770 MPa grade.

2. A method of manufacturing a high strength steel wire rope according to claim 1, characterized in that: The twisting pitch of the steel wire rope is 49.0-52.0 mm, the non-circularity is less than 3%, and the circularity is greater than 99%, the twisting direction of the steel wire rope is right alternating twist, and the strength of the center wire is greater than or equal to 1770 MPa.

3. The method of claim 1, wherein: The diameter of the center wire is 0.65±0.01 mm, the diameters of the inner layer wires and the outer layer wires are both 0.53±0.01 mm, and the diameter of the filling wire is 0.22±0.01 mm.

4. The method of claim 1, wherein: The nominal diameter of the synthetic fiber core is 4.30 mm, the diameter tolerance is 4.20-4.40 mm, and the linear density is 11-12 g / m.

5. The method of claim 1, wherein: In the rough drawing process, the center wire is drawn from a wire rod of 5.50 mm to 1.98 mm, and the diameter deviation is 0-0.03 mm; The outer layer wires and the inner layer wires are drawn from a wire rod of 5.50 mm to 1.85 mm, and the diameter deviation is 0-0.03 mm; The filling wire is drawn from a wire rod of 5.50 mm to 0.92 mm, and the diameter deviation is 0-0.02 mm.

6. The method of claim 1, wherein: The chemical composition of the wire rod used for the center wire, the outer layer wire and the inner layer wire, by weight percentage, is: C 0.52-0.60%, S≤0.035%, P≤0.035%, Si 0.17-0.37%, Mn 0.50-0.80%, and the balance is iron and inevitable impurity elements. The chemical composition of the wire rod used for the filling wire is, by weight percentage: C 0.42-0.50%, S≤0.035%, P≤0.035%, Si 0.17-0.37%, Mn 0.50-0.80%, and the balance being iron and inevitable impurity elements.

7. The method of claim 1, wherein: In the water tank wire drawing process, the center wire is drawn from 1.98 mm to 0.65 mm, with a diameter deviation of ±0.01 mm; The outer layer wire and the inner layer wire are drawn from 1.85 mm to 0.53 mm, with a diameter deviation of ±0.01 mm; The filling wire is drawn from 0.92 mm to 0.22 mm, with a diameter deviation of ±0.01 mm.

8. The method of claim 1, wherein: In the strand twisting process, the outer layer strand diameter is 2.60 mm, with a diameter deviation of ±0.03 mm, and the twisting pitch is 8.5 times ±1.5% of the outer layer strand diameter, and the rear straightening device is provided with 6 groups.

9. The method of claim 1, wherein: The rear straightening device in the rope combining process is provided with 6 groups.

10. A steel wire rope obtainable by the manufacturing process according to any one of claims 1 to 9, characterized in that, The steel wire rope comprises a center rope core and a plurality of outer layer strands twisted around the periphery of the center rope core, characterized in that the steel wire rope structure is 6×25F-SFC, each of the outer layer strands comprises, from inside to outside, one center wire, six inner layer wires and twelve outer layer wires, and six filling wires are filled in the gaps between the inner layer wires and the outer layer wires. The center rope core is a synthetic fiber core, the synthetic fiber core has a tensile force of ≥2000 N and an oil content of 6-10%, and the raw material of the synthetic fiber core comprises polypropylene, polyethylene and a reinforcing agent, wherein the weight ratio of polypropylene to polyethylene is 5:5, the reinforcing agent is polyvinylamide, and the amount of the reinforcing agent is 2±0.5% of the total weight of polypropylene and polyethylene. The steel wire rope has a diameter of 8.10-8.30 mm, a breaking tension of ≥37.4 KN, and a strength of 1770 MPa.

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