CN116815522A - High-strength steel wire rope and preparation method thereof - Google Patents
High-strength steel wire rope and preparation method thereof Download PDFInfo
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Abstract
The application discloses a high-strength steel wire rope and a preparation method thereof, belonging to the technical field of steel wire ropes, and the technical scheme is characterized in that the high-strength steel wire rope comprises a central rope core and a plurality of outer layer strands twisted on the periphery of the central rope core, wherein each outer layer strand sequentially comprises a central wire, a plurality of inner layer wires and a plurality of outer layer wires from inside to outside, and filling wires are filled between the gaps of the inner layer wires and the outer layer wires; the central rope core is a synthetic fiber core, the tension of the synthetic fiber core is more than 2000N, and the oil content is 6-10%; the diameter of the steel wire rope is 8.10-8.30mm, the breaking force is more than or equal to 37.4KN, and the strength is 1770MPa, so that the effects of meeting the use requirement of the elevator without a machine room and having wide use prospect are achieved by improving the rope core performance and the steel wire rope structure on the premise of reducing the cost.
Description
Technical Field
The application relates to the technical field of steel wire ropes, in particular to a high-strength steel wire rope and a preparation method thereof.
Background
The steel wire rope is a spiral body which is formed by twisting steel wires into strands according to a certain rule, has the advantages of good flexibility, strong bearing capacity, stable transmission, strong wear resistance, light dead weight, unique spiral structure and the like, and is widely applied to the fields of elevators, ship transportation, mining machinery, ocean engineering, aerospace and the like. The steel wire rope plays an important role in the operation of the elevator, and is one of important components of the elevator. The existing steel wire rope for the elevator is generally used in a machine room of a medium-high-rise building, and in a low-rise elevator without a machine room, due to limited space, the steel wire rope adjusting device in the elevator has certain defects and shortcomings compared with the existing machine room, so that the low-rise elevator without the machine room has higher requirements on the stability of the whole performance of the steel wire rope.
Aiming at the service environment of the elevator without a machine room, the steel wire rope is required to provide excellent wear resistance and bending fatigue resistance while ensuring lower and more stable elongation. The existing elevator steel wire rope in industry generally adopts an 8 multiplied by 19S structure, the rope core is a natural fiber rope core or a steel core, the strength level is 1370/1770MPa or 1620/1770MPa, and the flexibility of the 19S structure steel wire rope is low under the high strength of 1770MPa, so that the installation and bending fatigue resistance performance are affected. The natural fiber core rope core has excellent oil storage performance and good supporting force, but has poor diameter uniformity, uneven local rope core wire density and greatly influenced performance by environmental factors, and the uniformity of the elongation performance of the elevator rope is influenced; the steel core rope has high strength and good stability, but the oil content is less (2-3%), thereby increasing the maintenance cost of the elevator in use and shortening the maintenance period, and the dead weight of the steel core rope is too large and the manufacturing cost is too high.
Disclosure of Invention
The application provides a high-strength steel wire rope and a preparation method thereof, aiming at designing a steel wire rope with a strength grade of 1770MPa 6 multiplied by 25F-SFC and a high-strength synthetic fiber core, and meeting the use requirement of an elevator without a machine room on the premise of reducing the cost by improving the performance of the rope core and the structure of the steel wire rope.
The first aspect of the application: the technical scheme is as follows:
the high-strength steel wire rope comprises a central rope core and a plurality of outer layer strands twisted on the periphery of the central rope core, wherein the steel wire rope is of a structure of 6 multiplied by 25F-SFC, each outer layer strand sequentially comprises a central wire, six inner layer wires and twelve outer layer wires from inside to outside, and six filling wires are filled between the gaps of the inner layer wires and the outer layer wires;
the central rope core is a synthetic fiber core, the tension of the synthetic fiber core is more than 2000N, the oil content is 6-10%, the synthetic fiber core raw materials comprise polypropylene, polyethylene and a reinforcing agent, wherein the weight ratio of the polypropylene to the polyethylene is 5:5, the reinforcing agent is polyamide, and the dosage of the reinforcing agent is 2+/-0.5% of the sum of the weight of the polypropylene and the polyethylene;
the diameter of the steel wire rope is 8.10-8.30mm, the breaking force is more than or equal to 37.4KN, and the strength is 1770MPa.
Preferably, the twisting length of the steel wire rope is 49.0-52.0mm, the out-of-roundness is less than 3%, the roundness is more than 99%, the twisting direction of the steel wire rope is right-hand alternate twisting, and the strength of the central wire is more than or equal to 1770MPa.
Preferably, the diameter of the central wire is 0.65 plus or minus 0.01mm, the diameters of the inner layer wire and the outer layer wire are 0.53 plus or minus 0.01mm, and the diameter of the filling wire is 0.22 plus or minus 0.01mm.
Preferably, the nominal diameter of the synthetic fiber core is 4.30mm, the diameter allowable deviation is 4.20-4.40mm, and the linear density is 11-12g/m.
The second aspect of the application: the preparation method of the high-strength steel wire rope comprises the following steps:
checking wire rods, pickling phosphating surface treatment, rough wire drawing, heat treatment process, wire drawing by a water tank, twisting and rope combination and checking; the heat treatment process comprises the following steps:
the furnace temperature is 950+/-5 ℃, 935+/-5 ℃, 920+/-5 ℃, 905+/-5 ℃, 890+/-5 ℃ and DV value 65 from the feeding to the discharging;
in the rope combining process: the wheel distance of the pre-deformer is 0.86-0.88 times of the twisting distance of the steel wire rope, the rolling reduction of the deformer is 1.5-1.6 times of the diameter of the steel wire rope, the rolling reduction of the straightening wheel of the combined rope is 1.0-1.2 times of the diameter of the steel wire rope, the wheel distance of the straightening wheel of the combined rope is 1.6-1.7 times of the twisting distance of the steel wire rope, and the pre-warning is designed as follows: when the pretension is designed to be 12.4-12.6KN, the minimum value of the rope diameter of the steel wire rope is 7.85mm, and the maximum value of the rope diameter is 8.10mm.
Preferably, in the rough wire drawing process, the central wire is drawn from a wire rod with the diameter of 5.50mm to 1.98mm, and the diameter deviation is 0-0.03mm;
the outer layer wire and the inner layer wire are drawn to 1.85mm from a wire rod with the diameter of 5.50mm, and the diameter deviation is 0-0.03mm;
the filling wire is drawn from a wire rod of 5.50mm to 0.92mm, and the diameter deviation is 0-0.02mm.
Preferably, the chemical components of the wire rods used for the central wire, the outer wire and the inner wire are as follows in percentage by weight: 0.52-0.60% of C, less than or equal to 0.035% of S, less than or equal to 0.035% of P, 0.17-0.37% of Si, 0.50-0.80% of Mn, and the balance of iron and unavoidable impurity elements;
the wire rod used for the filling wire comprises the following chemical components in percentage by weight: 0.42-0.50% of C, less than or equal to 0.035% of S, less than or equal to 0.035% of P, 0.17-0.37% of Si, 0.50-0.80% of Mn, and the balance of iron and unavoidable impurity elements.
Preferably, in the water tank wire drawing process: drawing the diameter of the central wire from 1.98mm to 0.65mm, wherein the diameter deviation is +/-0.01 mm;
the diameters of the outer layer wire and the inner layer wire are drawn from 1.85mm to 0.53mm, and the diameter deviation is +/-0.01 mm;
the diameter of the filling wire is drawn from 0.92mm to 0.22mm, and the diameter deviation is +/-0.01 mm.
Preferably, in the yarn twisting process: the diameter of the outer strand is 2.60mm, the diameter deviation is +/-0.03 mm, the twisting distance is 8.5 times +/-1.5 percent (namely 21.7-22.4 mm) of the diameter of the outer strand, and 6 groups of post-straightening devices are arranged.
Preferably, the back straightening device in the rope combining process is provided with 6 groups.
In summary, the application has the following beneficial effects:
(2) The 6X 25F-SFC steel wire rope with the strength grade of 1770MPa has the advantages of wear resistance, bending fatigue resistance, low elongation and stable performance, is suitable for the use environment of an elevator without a machine room, and has more excellent elongation performance and structural stability than those of an 8-strand steel wire rope;
(2) The synthetic fiber core is matched with the outer layer strand of the 6X 25F structure, so that the overall stability of the steel wire rope is improved, and meanwhile, the synthetic fiber core has the advantages of high strength, high strength and toughness, low elongation, uniform and consistent linear density, excellent fiber compactness and strong environmental adaptability;
(3) Setting the temperatures of five heating areas of the heating furnace to 950+/-5 ℃ from a feeding area to a discharging area in sequence, wherein the temperature is 935+/-5 ℃, the temperature is 920+/-5 ℃, the temperature is 905+/-5 ℃, the temperature is 890+/-5 ℃, and the DV value is controlled to 65, so that the heat treatment effect of the central wire, the inner wire, the outer wire and the filling wire is ensured while the production efficiency is ensured, the sorbite rate of the central wire, the inner wire, the outer wire and the filling wire is more than 95%, and the steel wire rope is ensured to have the advantages of wear resistance, bending fatigue resistance and stable performance;
(4) According to the application, the diameters of the central wire, the inner wire and the outer wire for the outer strand of the steel wire rope are optimized, so that the performance of the steel wire rope for the elevator without a machine room is met, and meanwhile, the production cost of the steel wire rope is reduced.
Drawings
FIG. 1 is a schematic view of a 6X 25F-SFC-8mm cross-sectional structure of a steel wire rope of the present application.
Reference numerals illustrate:
1. an outer layer wire; 2. an inner layer wire; 3. a center wire; 4. filling wires; 5. a synthetic fiber core.
Detailed Description
The present application will be described in further detail with reference to the accompanying drawings.
The utility model provides a high strength wire rope, its structure is 6X 25F-SFC, as shown in FIG. 1, specifically include the central rope core of making by synthetic fiber core 5 and six outer strands of twisting at central rope core periphery, six outer strand cladding synthetic fiber cores 5, every outer strand includes central silk 3 from inside to outside in proper order, inlayer silk 2 and outer silk 1, central silk 3 sets up to one, inlayer silk 2 and outer silk 1 all set up many, specifically six inlayer silk 2 set up around central silk 3, and the surface butt of inlayer silk 2 and the surface butt of central silk 3, twelve outer silk 1 set up around a plurality of inlayer silk 2, and the surface butt of outer silk 1 has six filler wires 4 in the clearance of inlayer silk 2 and outer silk 1, wherein:
the diameter of the central wire is 0.65 plus or minus 0.01mm, the diameters of the inner layer wire and the outer layer wire are 0.53 plus or minus 0.01mm, and the diameter of the filling wire is 0.22 plus or minus 0.01mm.
The nominal diameter of the wire rods used for the central wire, the inner wire and the outer wire is 5.50mm, the allowable deviation of the diameter is +/-0.30 mm, the chemical components of the wire rods are, by weight, C0.52-0.60%, S less than or equal to 0.035%, P less than or equal to 0.035%, si 0.17-0.37%, mn 0.50-0.80%, and the balance of iron and unavoidable impurity elements; the tensile strength of the wire rod is more than or equal to 800MPa, the elongation is more than or equal to 8%, the area shrinkage is more than or equal to 35%, the depth of a decarburized layer of the wire rod is less than or equal to 2.0% D, and no quenching tissue affecting the use exists in the wire rod.
The nominal diameter of the wire rod used for filling the wire is 5.50mm, the allowable deviation of the diameter is +/-0.30 mm, the chemical components of the wire rod are, by weight, C0.42-0.50%, S less than or equal to 0.035%, P less than or equal to 0.035%, si 0.17-0.37%, mn 0.50-0.80%, and the balance of iron and unavoidable impurity elements, the tensile strength of the wire rod is more than or equal to 750MPa, the elongation is more than or equal to 8%, the reduction of area is more than or equal to 40%, the depth of decarburized layer of the wire rod is less than or equal to 2.0% D, and quenching tissues which do not affect the use in the wire rod exist.
The synthetic fiber core of the application is purchased from Tianjin Ming ladder wire rope products limited company, and the specific performance of the synthetic fiber core is as follows: the synthetic fiber core has nominal diameter of 4.30mm, allowable diameter deviation of +/-0.10 mm, oil content of 6-10%, linear density of 11-12g/m, breaking force of > 2000N, left-hand exchange of twisting direction, twisting distance of less than or equal to 3.3 times, synthetic fiber core raw material comprising polypropylene, polyethylene and reinforcing agent, wherein the weight ratio of polypropylene to polyethylene is 5:5, reinforcing agent is polyethylene amide, the dosage is 2+/-0.5% of the sum of the polypropylene and the polyethylene, the oiling mode of the synthetic fiber core is 2 strand single filament oiling, and the used grease is motion viscousThe degree (100 ℃) is more than or equal to 25mm 2 And/s, the dropping point is more than or equal to 70 ℃, the acid value is less than or equal to 0.35mg KOH/g, and the appearance is yellow uniform ointment.
Example 1
The preparation method of the high-strength steel wire rope comprises the following steps of
(1) Checking a wire rod;
(2) Acid pickling and phosphating the surface;
(3) And (3) rough wire drawing: the central wire is drawn to 1.98mm by a wire rod with the diameter deviation of 0-0.03mm and the process line deviation of +/-0.03 mm;
the outer layer wire and the inner layer wire are drawn to 1.85mm from a wire rod with the diameter deviation of 0-0.03mm, and the process line deviation is +/-0.03 mm;
the filling wire is drawn to 0.92mm by a wire rod with the diameter deviation of 0-0.02mm and the process line deviation of +/-0.03 mm;
(4) The heat treatment process comprises the following steps: the central wire, the inner layer wire, the outer layer wire and the filling wire after the rough wire drawing process enter a heating furnace, the temperature of 5 heating areas of the heating furnace is sequentially set to 950 ℃, 935 ℃, 920 ℃, 905 ℃, 890 ℃ from a feeding area to a discharging area, and the DV value is controlled to be 65;
(5) Drawing in a water tank: after the heat treatment process, drawing the diameter of the central wire from 1.98mm to 0.65mm, wherein the diameter deviation is +/-0.01 mm, and the process line deviation is +/-0.02 mm;
the diameters of the outer layer wire and the inner layer wire are drawn from 1.85mm to 0.53mm, the diameter deviation is +/-0.01 mm, and the process line deviation is +/-0.02 mm;
drawing the diameter of the filling wire from 0.92mm to 0.22mm, wherein the diameter deviation is +/-0.01 mm, and the process line deviation is +/-0.02 mm;
(6) Yarn twisting process: the method comprises the steps of carrying out wire matching on a central wire, six inner layer wires, twelve outer layer wires and six filling wires to form an outer layer strand with a strand diameter of 2.60mm, wherein the allowable deviation of the diameter of the outer layer strand is +/-0.03 mm, the lay length is 21.7mm, straightening is carried out after twisting, and six groups of straightening devices are arranged;
(7) And a rope combining process, wherein the outer layer strand obtained in the strand twisting process and the synthetic fiber core are subjected to rope combining treatment, the nominal diameter of the designed steel wire rope is 8mm, the twisting distance is 49.0mm, and the method comprises the following steps:
the wheel distance of the pre-deformer is 0.86 times of the twisting distance of the steel wire rope;
the reduction of the deformer is 1.5 times of the diameter of the steel wire rope;
the reduction of the rope combination straightening wheel is 1.0-1.2 times of the diameter of the steel wire rope;
the wheel distance of the rope combination straightening wheel is 1.6 times of the twisting distance of the steel wire rope;
designing and early warning: under the tension of 12.4-12.6KN, the minimum value of the wire rope diameter is 7.85mm, the maximum value of the wire rope diameter is 8.10mm, a laser calliper is used for monitoring the wire rope diameter in real time, and when the diameter exceeds the allowable range, an alarm is given, and an operator detects and adjusts the wire rope diameter, the strand diameter and the like; straightening after twisting, wherein the straightening device is provided with six groups;
(8) Inspecting a finished product, wherein the twisting direction of the steel wire rope is right alternate twisting, the twisting is uniform, compact and not loose, the steel wires in the steel wire rope cannot have the defects of interlacing, bending, wire breakage and the like, and the surfaces of the steel wire rope strands and the rope are flat and allow uniform gaps;
(9) Packaging and warehousing.
Example 2
The preparation method of the high-strength steel wire rope comprises the following steps of
(1) Checking a wire rod;
(2) Acid pickling and phosphating the surface;
(3) And (3) rough wire drawing: the central wire is drawn to 1.98mm by a wire rod with the diameter deviation of 0-0.03mm and the process line deviation of +/-0.03 mm;
the outer layer wire and the inner layer wire are drawn to 1.85mm from a wire rod with the diameter deviation of 0-0.03mm, and the process line deviation is +/-0.03 mm;
the filling wire is drawn to 0.92mm by a wire rod with the diameter deviation of 0-0.02mm and the process line deviation of +/-0.03 mm; (4) heat treatment process: the central wire, the inner wire, the outer wire and the filling wire after the rough wire drawing process enter a heating furnace, the temperature of 5 heating areas of the heating furnace is sequentially set to 955 ℃, 930 ℃, 925 ℃, 905 ℃ and 895 ℃ from a feeding area to a discharging area, and the DV value is controlled to be 65;
(5) Drawing in a water tank: after the heat treatment process, drawing the diameter of the central wire from 1.98mm to 0.65mm, wherein the diameter deviation is +/-0.01 mm, and the process line deviation is +/-0.02 mm;
the diameters of the outer layer wire and the inner layer wire are drawn from 1.85mm to 0.53mm, the diameter deviation is +/-0.01 mm, and the process line deviation is +/-0.02 mm;
drawing the diameter of the filling wire from 0.92mm to 0.22mm, wherein the diameter deviation is +/-0.01 mm, and the process line deviation is +/-0.02 mm;
(6) Yarn twisting process: the method comprises the steps of carrying out wire matching on a central wire, six inner layer wires, twelve outer layer wires and six filling wires to form an outer layer strand with a strand diameter of 2.60mm, wherein the allowable deviation of the diameter of the outer layer strand is +/-0.03 mm, the lay length is 22.0mm, straightening is carried out after twisting, and six groups of straightening devices are arranged;
(7) And a rope combining process, wherein the outer layer strand obtained in the strand twisting process and the synthetic fiber core are subjected to rope combining treatment, the nominal diameter of the designed steel wire rope is 8mm, the twisting distance is 51mm, and the method comprises the following steps:
the wheel distance of the pre-deformer is 0.86 times of the twisting distance of the steel wire rope;
the reduction of the deformer is 1.5 times of the diameter of the steel wire rope;
the reduction of the rope combination straightening wheel is 1.0-1.2 times of the diameter of the steel wire rope;
the wheel distance of the rope combination straightening wheel is 1.6 times of the twisting distance of the steel wire rope;
designing and early warning: under the tension of 12.4-12.6KN, the minimum value of the wire rope diameter is 7.85mm, the maximum value of the wire rope diameter is 8.10mm, a laser calliper is used for monitoring the wire rope diameter in real time, and when the diameter exceeds the allowable range, an alarm is given, and an operator detects and adjusts the wire rope diameter, the strand diameter and the like; straightening after twisting, wherein the straightening device is provided with six groups;
(8) Inspecting a finished product, wherein the twisting direction of the steel wire rope is right alternate twisting, the twisting is uniform, compact and not loose, the steel wires in the steel wire rope cannot have the defects of interlacing, bending, wire breakage and the like, and the surfaces of the steel wire rope strands and the rope are flat and allow uniform gaps;
(9) Packaging and warehousing.
Example 3
The preparation method of the high-strength steel wire rope comprises the following steps of
(1) Checking a wire rod;
(2) Acid pickling and phosphating the surface;
(3) And (3) rough wire drawing: the central wire is drawn to 1.98mm by a wire rod with the diameter deviation of 0-0.03mm and the process line deviation of +/-0.03 mm;
the outer layer wire and the inner layer wire are drawn to 1.85mm from a wire rod with the diameter deviation of 0-0.03mm, and the process line deviation is +/-0.03 mm;
the filling wire is drawn to 0.92mm by a wire rod with the diameter deviation of 0-0.02mm and the process line deviation of +/-0.03 mm; (4) heat treatment process: the central wire, the inner wire, the outer wire and the filling wire after the rough wire drawing process enter a heating furnace, the temperature of 5 heating areas of the heating furnace is sequentially set to 945 ℃, 940 ℃, 915 ℃, 910 ℃ and 885 ℃ from a feeding area to a discharging area, and the DV value is controlled to 65;
(5) Drawing in a water tank: after the heat treatment process, drawing the diameter of the central wire from 1.98mm to 0.65mm, wherein the diameter deviation is +/-0.01 mm, and the process line deviation is +/-0.02 mm;
the diameters of the outer layer wire and the inner layer wire are drawn from 1.85mm to 0.53mm, the diameter deviation is +/-0.01 mm, and the process line deviation is +/-0.02 mm;
drawing the diameter of the filling wire from 0.92mm to 0.22mm, wherein the diameter deviation is +/-0.01 mm, and the process line deviation is +/-0.02 mm;
(6) Yarn twisting process: the method comprises the steps of carrying out wire matching on a central wire, six inner layer wires, twelve outer layer wires and six filling wires to form an outer layer strand with a strand diameter of 2.60mm, wherein the allowable deviation of the diameter of the outer layer strand is +/-0.03 mm, the lay length is 22.4mm, straightening is carried out after twisting, and six groups of straightening devices are arranged;
(7) And a rope combining process, wherein the outer layer strand obtained in the strand twisting process and the synthetic fiber core are subjected to rope combining treatment, the nominal diameter of the designed steel wire rope is 8mm, the twisting distance is 52.0mm, and the method comprises the following steps:
the wheel distance of the pre-deformer is 0.88 times of the twisting distance of the steel wire rope;
the reduction of the deformer is 1.6 times of the diameter of the steel wire rope;
the reduction of the rope combination straightening wheel is 1.0-1.2 times of the diameter of the steel wire rope;
the wheel distance of the rope combination straightening wheel is 1.7 times of the twisting distance of the steel wire rope;
designing and early warning: under the tension of 12.4-12.6KN, the minimum value of the wire rope diameter is 7.85mm, the maximum value of the wire rope diameter is 8.10mm, a laser calliper is used for monitoring the wire rope diameter in real time, and when the diameter exceeds the allowable range, an alarm is given, and an operator detects and adjusts the wire rope diameter, the strand diameter and the like; straightening after twisting, wherein the straightening device is provided with six groups;
(8) Inspecting a finished product, wherein the twisting direction of the steel wire rope is right alternate twisting, the twisting is uniform, compact and not loose, the steel wires in the steel wire rope cannot have the defects of interlacing, bending, wire breakage and the like, and the surfaces of the steel wire rope strands and the rope are flat and allow uniform gaps;
(9) Packaging and warehousing.
Comparative example 1
The difference from example 1 is that the synthetic fiber core is replaced by a natural fiber core, which is prepared from sisal hemp, has a diameter of 4.2mm, a diameter deviation of 4.10-4.40mm, a linear density of 13-14g/m, an oil content of 10-14% and a tensile force of > 1290N, in the other steps than example 1.
Comparative example 2
The difference from example 1 is that in the heat treatment process, the temperatures of the 5 heating zones of the heating furnace were set to 940 c, 925 c, 910 c, 895 c, 880 c in this order from the feeding zone to the discharging zone, and the other steps were the same as in example 1.
Comparative example 3
The difference from example 1 is that in the rope combining process:
the wheel distance of the pre-deformer is 0.80 times of the twisting distance of the steel wire rope;
the reduction of the deformer is 1.3 times of the diameter of the steel wire rope;
the reduction of the rope combination straightening wheel is 0.8-0.9 times of the diameter of the steel wire rope;
the lay length of the rope-closing straightening wheels is 1.4 times of the lay length of the steel wire rope, and other steps are the same as in the embodiment 1.
Comparative example 4
The difference from example 1 is that in the rope combining process:
the wheel distance of the pre-deformer is 0.90 times of the twisting distance of the steel wire rope;
the reduction of the deformer is 1.7 times of the diameter of the steel wire rope;
the reduction of the rope combination straightening wheel is 1.3-1.4 times of the diameter of the steel wire rope;
the lay length of the rope-closing straightening wheels is 1.8 times of the lay length of the steel wire rope, and other steps are the same as in the embodiment 1.
Performance detection
The wire ropes obtained in the above examples were subjected to performance tests according to the specifications in GB/T8903-2018 Steel wire rope for Elevator, and the test results are shown in the following table.
TABLE 1 detection results of outer strand wires after Water tank wiredrawing
Table 2 table of the results of the wire rope performance test
Wherein, the bending fatigue test is to look at the number of broken wires after bending for 60 ten thousand times.
From table 2 it can be seen that: the steel wire rope obtained in the embodiment 1-3 has the advantages that the breaking force is more than 40KN, the elastic elongation and the structural elongation are low, no broken wire occurs after 60 ten thousands of times of bending, the diameter uniformity of the steel wire rope obtained in the application is good, the roundness is more than 99%, the non-roundness is within 3%, and the performance stability is good.
When the natural fiber core was used instead of the synthetic fiber core, the elastic elongation, the structural elongation, the bending fatigue property, the roundness and the non-roundness of the steel wire rope obtained in comparative example 1 were all inferior to those in example 1, indicating that the performance of the steel wire rope obtained in the present application was more stable.
Comparative examples 2 to 4 compared with example 1, when the furnace temperature in the heat treatment process and the parameters in the rope closing process are not within the scope of the present application, the obtained steel wire rope has inferior elastic elongation, structural elongation, bending fatigue property, roundness and non-roundness to those of example 1, indicating that the problems of bending fatigue resistance and uniformity of the steel wire rope of 6 x 25F-SFC can be effectively ensured by adjusting the process parameters in the heat treatment process and the rope closing process.
The embodiments of the present application are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (10)
1. The utility model provides a high strength wire rope, includes central rope core and stranded outer strand of twisting in central rope core periphery, its characterized in that: the steel wire rope structure is 6 multiplied by 25F-SFC, each outer strand sequentially comprises a central wire, six inner layer wires and twelve outer layer wires from inside to outside, and six filling wires are filled between the gaps of the inner layer wires and the outer layer wires;
the central rope core is a synthetic fiber core, the tensile force of the synthetic fiber core is larger than or equal to 2000N, the oil content is 6-10%, the synthetic fiber core raw materials comprise polypropylene, polyethylene and a reinforcing agent, wherein the weight ratio of the polypropylene to the polyethylene is 5:5, the reinforcing agent is polyamide, and the dosage of the reinforcing agent is 2+/-0.5% of the total weight of the polypropylene and the polyethylene;
the diameter of the steel wire rope is 8.10-8.30mm, the breaking force is more than or equal to 37.4KN, and the strength is 1770MPa.
2. A high strength steel cord according to claim 1, characterized in that: the twisting length of the steel wire rope is 49.0-52.0mm, the out-of-roundness is less than 3%, the roundness is more than 99%, the twisting direction of the steel wire rope is right-hand alternate twisting, and the strength of the central wire is more than or equal to 1770MPa.
3. A high strength steel cord according to claim 1, characterized in that: the diameter of the central wire is 0.65 plus or minus 0.01mm, the diameters of the inner layer wire and the outer layer wire are 0.53 plus or minus 0.01mm, and the diameter of the filling wire is 0.22 plus or minus 0.01mm.
4. A high strength steel cord according to claim 1, characterized in that: the nominal diameter of the synthetic fiber core is 4.30mm, the diameter allowable deviation is 4.20-4.40mm, and the linear density is 11-12g/m.
5. A method of producing a high strength steel wire rope according to any one of claims 1 to 4, wherein: the method comprises the following steps:
checking wire rods, pickling phosphating surface treatment, rough wire drawing, heat treatment process, wire drawing by a water tank, twisting and rope combination and checking; the heat treatment process comprises the following steps:
the furnace temperature is 950+/-5 ℃, 935+/-5 ℃, 920+/-5 ℃, 905+/-5 ℃, 890+/-5 ℃ and DV value 65 from the feeding to the discharging;
in the rope combining process: the wheel distance of the pre-deformer is 0.86-0.88 times of the twisting distance of the steel wire rope, the rolling reduction of the deformer is 1.5-1.6 times of the diameter of the steel wire rope, the rolling reduction of the straightening wheel of the combined rope is 1.0-1.2 times of the diameter of the steel wire rope, the wheel distance of the straightening wheel of the combined rope is 1.6-1.7 times of the twisting distance of the steel wire rope, and the pre-warning is designed as follows: when the pretension is designed to be 12.4-12.6KN, the minimum value of the rope diameter of the steel wire rope is 7.85mm, and the maximum value of the rope diameter is 8.10mm.
6. The method for manufacturing a high-strength steel wire rope according to claim 5, wherein: in the thick wire drawing process, a central wire is drawn to 1.98mm from a wire rod with the diameter of 5.50mm, and the diameter deviation is 0-0.03mm;
the outer layer wire and the inner layer wire are drawn to 1.85mm from a wire rod with the diameter of 5.50mm, and the diameter deviation is 0-0.03mm;
the filling wire is drawn from a wire rod of 5.50mm to 0.92mm, and the diameter deviation is 0-0.02mm.
7. The method for manufacturing a high-strength steel wire rope according to claim 5, wherein: the wire rods used for the central wire, the outer wire and the inner wire comprise the following chemical components in percentage by weight: 0.52-0.60% of C, less than or equal to 0.035% of S, less than or equal to 0.035% of P, 0.17-0.37% of Si, 0.50-0.80% of Mn, and the balance of iron and unavoidable impurity elements;
the wire rod used for the filling wire comprises the following chemical components in percentage by weight: 0.42-0.50% of C, less than or equal to 0.035% of S, less than or equal to 0.035% of P, 0.17-0.37% of Si, 0.50-0.80% of Mn, and the balance of iron and unavoidable impurity elements.
8. The method for manufacturing a high-strength steel wire rope according to claim 5, wherein: in the water tank wire drawing process, the following steps are adopted: drawing the diameter of the central wire from 1.98mm to 0.65mm, wherein the diameter deviation is +/-0.01 mm;
the diameters of the outer layer wire and the inner layer wire are drawn from 1.85mm to 0.53mm, and the diameter deviation is +/-0.01 mm;
the diameter of the filling wire is drawn from 0.92mm to 0.22mm, and the diameter deviation is +/-0.01 mm.
9. The method for manufacturing a high-strength steel wire rope according to claim 5, wherein: the yarn twisting process comprises the following steps: the diameter of the outer layer strand is 2.60mm, the diameter deviation is +/-0.03 mm, the twisting distance is 8.5 times +/-1.5% of the diameter of the outer layer strand, and 6 groups of post-straightening devices are arranged.
10. The method for manufacturing a high-strength steel wire rope according to claim 5, wherein: the back straightening device in the rope combining process is provided with 6 groups.
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