A production method for double-die drawing and single-shot forming of steel wire rope

Abstract

The present invention provides a production method for double-mode drawing and single-shot forming of a steel wire rope, the production method comprising obtaining a center wire, a second layer wire and a third layer wire from a stainless steel busbar after wet drawing, the center wire and the second layer wire passing through a first die to form a center strand, and then entering a second die together with the third layer wire, and undergoing twisting and rope closing and post-deformation stress relief treatment to obtain a steel wire rope product. The production method of the present invention is simple to operate, and the obtained steel wire rope product has a higher breaking tensile force, higher dimensional accuracy and a certain degree of flexibility, and the surface of the steel wire rope product is smoother.

Description

Technical Field

[0001] The invention relates to the technical field of metal product processing, and in particular to a production method for double-die drawing and single-shot forming of a steel wire rope. Background Art

[0002] The use of wire ropes in different fields is increasing, and the requirements for their quality and performance are getting higher and higher. Under the premise that the diameter of the wire rope does not increase basically, higher requirements are put forward for the breaking tension of the wire rope, requiring the wire rope to have stronger fatigue resistance and lower elongation.

[0003] CN108316028A discloses a steel wire rope composite fiber core and its preparation method and application, wherein the steel wire rope composite fiber core is formed by twisting a plurality of composite fiber core strands; each composite fiber core strand includes a jute main core and a polypropylene outer core, and a plurality of polypropylene filaments form the polypropylene outer core and are uniformly twisted on the outside of the jute main core. The present invention adopts jute yarn to replace sisal yarn to prepare the steel wire rope core, thereby avoiding the problem of large fluctuation of the rope core diameter. The jute rope core has uniform rope diameter and good oil absorption, which effectively reduces the vibration and noise during the operation of the elevator; the fatigue wire breaking rate of the whole rope is worse than that of the sisal rope core; and the composite structure of the polypropylene filament outer core twisting the jute main core makes up for the disadvantage that the strength of jute fiber is not as good as that of sisal fiber, and makes the strength of the composite fiber core better than that of the sisal rope core.

[0004] CN103757952A discloses a double compacted steel wire rope for port machinery, which includes 1 steel core center strand, 6 steel core outer strands and 6 outer strands, the steel core outer strands are symmetrically twisted around the steel core center strand to form a steel core, and the outer strands are symmetrically twisted around the steel core. The steel wire rope is a compacted rope, the strands inside the rope are in surface contact, the outer strands are compacted strands, and the steel wires inside the strands are in surface contact. The double compacted steel wire rope for port machinery has super high breaking tensile force, strong wear resistance, extrusion resistance and impact load resistance, because the structure of the strands is in surface contact after die extrusion, and the contact surface of the steel wire rope with the pulley after compaction. Compared with steel wire ropes of the same diameter and strength, its load-bearing capacity is increased by 20%, and its wear resistance is increased by nearly 25%. The service life of the steel wire rope is long, which correspondingly reduces the operating cost of port machinery.

[0005] CN104594083A discloses a steel wire rope for railway compensation device and a production method thereof, which is composed of a center strand, a center side strand arranged outside the center strand and in a hexagonal arrangement with the center strand, and an outer layer strand arranged outside the center side strand and in an octagonal arrangement with the center side strand, wherein the number of center side strands is six and the number of outer layer strands is eight; point contact is made between the center strand and the center side strand, and between the center side strand and the outer layer strand. The steel wire rope for railway compensation device has a simple structure, low production cost, strong tensile strength, fatigue resistance, corrosion resistance and wear resistance, and long service life. Compared with conventional steel wire ropes, the steel wire rope has a high filling coefficient and thickened steel wire on the contact surface, so that the steel wire rope has the advantages of high strength, high fatigue resistance and high electrical conductivity.

[0006] Existing technologies focus on improving steel wire ropes for large equipment such as elevators, port machinery and railway compensation devices, but have not yet improved steel wire ropes for small devices such as brakes or transmissions of high-end fitness equipment, high-end bicycles / motorcycles, etc. The steel wire ropes for these small devices not only require higher breaking tension and lower elongation, but also must have a smooth surface and a certain degree of flexibility.

[0007] Therefore, it is of great significance to develop a method for producing a steel wire rope for small devices, and to produce a steel wire rope with higher breaking tension and lower elongation, smooth surface and certain flexibility. Summary of the invention

[0008] In view of the problems existing in the prior art, the present invention provides a production method for double-mode drawing and single-forming of steel wire ropes. Under the premise of using the original stainless steel busbar, the production method can enable 12+6+1 steel wire rope products with the same diameter and the same structure to obtain higher breaking tension, higher precision, lower elongation, smoother surface, and a certain degree of flexibility.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] In a first aspect, the present invention provides a production method for a steel wire rope by double-mold drawing and single-shot forming, the production method comprising the following steps:

[0011] (1) The stainless steel busbar is drawn to obtain a stainless steel wire; the stainless steel wire is divided into a center wire, a second layer wire and a third layer wire;

[0012] (2) The center wire, the second layer wire and the third layer wire of step (1) pass through the center hole, the second layer positioning hole and the third layer positioning hole of the distribution plate respectively, and the center wire and the second layer wire enter the first mold for twisting and drawing to obtain the center strand;

[0013] (3) The central strand and the third layer of wire in step (2) enter a second die for drawing and twisting to obtain a twisted steel wire rope;

[0014] (4) After twisting in step (3), the steel wire rope is subjected to post-deformation stress relief treatment to obtain a steel wire rope product.

[0015] The production method of the present invention adopts a splitter disc double-mode drawing, firstly, the center strand is made of the center wire and the second layer wire; then the center strand passes through the first die and enters the second die together with the third layer wire, and is twisted and connected and post-deformed to eliminate stress, so as to obtain a steel wire rope product. The present invention adopts a reasonable wire diameter ratio and a stainless steel busbar with certain quality requirements, a splitter disc and two dies, so as to obtain a steel wire rope product with higher breaking tension, higher dimensional accuracy, certain flexibility and smoother surface.

[0016] Preferably, the stainless steel busbar in step (1) comprises a 304 stainless steel busbar.

[0017] Preferably, the 304 stainless steel busbar comprises the following components in mass percentage: C: 0.042-0.048%, 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: 0.67-0.90%, for example, 0.67%, 0.69%, 0.70%, 0.72%, 0.75% , 0.80%, 0.85% or 0.90%; Si: 0.29-0.35%, for example, it can be 0.29%, 0.30%, 0.31%, 0.34% or 0.35%; P≤0.032%, for example, it can be 0.0032%, 0.0031%, 0.0030%, 0.0028%, 0.0025% or 0.0020%; S≤0.003%, for example, it can be 0.003%, 0.002%, 0.001% or 0.0005%; N≤0.008%, for example, it can be 0.008%, 0.007%, 0.005%, 0.004%, 0.002% or 0.001%; ​​the balance is Fe and unavoidable impurities.

[0018] Preferably, the strength of the 304 stainless steel busbar is 720-780 MPa, for example, 720 MPa, 730 MPa, 740 MPa, 750 MPa, 760 MPa, 770 MPa or 780 MPa.

[0019] The present invention preferably has a strength of 720-780 MPa and a grain size of 7±1. When the strength of the drawing production is greater than 1960 MPa, the 304 stainless steel busbar has a high torsion value and good toughness, which is conducive to subsequent processing and forming, thereby obtaining a steel wire rope product with high breaking force.

[0020] Preferably, the elongation of the 304 stainless steel busbar is 35% to 45%, for example, it may be 35%, 37%, 49%, 40%, 42%, 44% or 45%.

[0021] The present invention preferably has an elongation of 304 stainless steel busbar of 35% to 45%, and a grain size of 7±1. When the strength of the drawing production is greater than 1960 MPa, the 304 stainless steel busbar has a high torsion value, good toughness, and is conducive to subsequent processing and forming, thereby obtaining a steel wire rope product with high breaking force.

[0022] The production method of the present invention further preferably adopts a wire diameter ratio of: 0.39mm / 0.35mm / 0.28mm / 0.35mm, and the main process of the wire drawing process is: 1.4→0.39mm, 1.2→0.35mm, 1.0mm→0.28mm.

[0023] Preferably, the drawing in step (1) comprises wet drawing.

[0024] Preferably, the oil temperature of the wet drawing is ≤45°C, for example, it may be 45°C, 44°C, 42°C, 40°C, 38°C, 35°C, 30°C or 25°C.

[0025] Preferably, the third layer of silk includes a first third layer of silk and a second third layer of silk.

[0026] Preferably, the wet drawing makes the area reduction ratio of the 304 stainless steel busbar be 91.4-92.5%, for example, 91.4%, 91.8%, 92.0%, 92.1%, 92.3% or 92.5%.

[0027] The wet drawing of the present invention preferably makes the area reduction rate of the 304 stainless steel busbar be 91.4-92.5%. If the area reduction rate is too low, its strength will be reduced, thereby resulting in a reduction in the breaking tension of the final steel wire rope product; if the area reduction rate is too high, the toughness of the 304 stainless steel busbar will be poor, and the breaking tension of the final steel wire rope product will be reduced.

[0028] Preferably, after the wet drawing, the diameter ratio of the center wire, the second layer wire, the first third layer wire and the second third layer wire is 39:35:28:35.

[0029] Preferably, the strength of the stainless steel wire is greater than 1960 MPa, for example, it may be 1960 MPa, 1965 MPa, 1970 MPa, 1980 MPa, 1990 MPa or 2000 MPa.

[0030] Preferably, the loop diameter of the stainless steel wire is greater than 15 cm, for example, it may be 16 cm, 17 cm, 18 cm, 19 cm, 20 cm, 23 cm, or 25 cm.

[0031] 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.

[0032] Preferably, the distribution plate includes 1 central hole, 6 second-layer positioning holes and 12 third-layer positioning holes.

[0033] Preferably, the material of the distribution plate includes iron.

[0034] Preferably, the material of the center hole, the second layer positioning holes and the third layer positioning holes of the distribution plate are independently made of hard alloy steel.

[0035] The present invention preferably adopts the material of the center hole, the second layer positioning hole and the third layer positioning hole of the distribution disk to independently include carbide steel rather than iron and other materials, because carbide steel has high hardness and strong wear resistance, ensuring that the distribution disk will not be damaged when the stainless steel wire passes through the distribution disk.

[0036] Preferably, the included angle between the center line of the second layer positioning holes and the center line of the distribution plate is 60°.

[0037] Preferably, the distance between the center of the second layer positioning hole and the center of the distribution plate is 34-40 mm, for example, 34 mm, 35 mm, 37 mm, 38 mm, 39 mm or 40 mm.

[0038] The present invention preferably has a distance between the center of the second layer positioning hole and the center of the distribution plate of 34 to 40 mm, and the angle between the center wire and the second layer wire passing through the positioning hole and entering the mold and the horizontal line is close to 50°, which is beneficial for the center wire and the second layer wire to not be staggered at the closing point of the mold entrance, and the center strand is smoother.

[0039] Preferably, the angle between the center line of the third layer positioning hole and the center line of the distribution plate is 30°.

[0040] Preferably, the distance between the center of the third layer positioning hole and the center of the distribution plate is 44-50 mm, for example, 44 mm, 45 mm, 48 mm, 49 mm or 50 mm.

[0041] The naming of the center hole, the second layer positioning hole and the third layer positioning hole of the distribution plate in the present invention is as follows: Figure 1 As shown, the center hole is named 1, the second layer positioning holes are named 2, 3, 4, 5, 6, and 7 clockwise from the north, and the third layer positioning holes are named 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 and 19 clockwise from the north, among which the third layer positioning holes 8, 10, 12, 14, 16, 18 are aligned with the second layer positioning holes 2, 3, 4, 5, 6, and 7 in sequence.

[0042] Preferably, the six No. 1 third layer wires and the six No. 2 third layer wires are staggered and passed through the third positioning holes.

[0043] The six No. 1 third layer wires and six No. 2 third layer wires described in the present invention are staggered through the third positioning hole, which means that the No. 1 third layer wire with a diameter of 0.35 mm passes through the positioning hole 8, the No. 2 third layer wire with a diameter of 0.28 mm passes through the positioning hole 9, the No. 1 third layer wire with a diameter of 0.35 mm passes through the positioning hole 10, the No. 2 third layer wire with a diameter of 0.28 mm passes through the positioning hole 11, and so on, or the No. 2 third layer wire with a diameter of 0.28 mm passes through the positioning hole 8, the No. 1 third layer wire with a diameter of 0.35 mm passes through the positioning hole 9, the No. 2 third layer wire with a diameter of 0.28 mm passes through the positioning hole 10, and the No. 1 third layer wire with a diameter of 0.35 mm passes through the positioning hole 11. The purpose of staggered stainless steel wires of different diameters passing through the third positioning hole is to make the surface of the final steel wire rope product smoother and convenient for subsequent use.

[0044] Preferably, the aperture size of the first mold in step (2) is 1.02-1.03 mm, for example, it can be 1.02 mm, 1.022 mm, 1.025 mm, 1.027 mm, 1.029 mm or 1.03 mm.

[0045] Preferably, the length of the sizing belt of the first die is 0.7-1.7 mm, for example, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.5 mm or 1.7 mm.

[0046] The present invention preferably sets the sizing band length of the first die to be 0.7-1.7 mm. By controlling the sizing band length of the first die, the deformation degree of the center strand can be controlled to avoid excessive internal stress of the obtained steel wire rope product, which leads to a reduction in its breaking tension.

[0047] Preferably, the aperture size of the second mold in step (3) is 1.502-1.518 mm, for example, it can be 1.502 mm, 1.505 mm, 1.507 mm, 1.509 mm, 1.512 mm, 1.515 mm or 1.518 mm.

[0048] Preferably, the length of the sizing belt of the second die is 0.87-1.87 mm, for example, it can be 0.87 mm, 0.89 mm, 0.91 mm, 0.93 mm, 1.00 mm, 1.20 mm, 1.40 mm, 1.50 mm or 1.87 mm.

[0049] The preferred length of the sizing band of the second die of the present invention is 0.87-1.87 mm, so that the obtained steel wire rope product has more stable dimensional accuracy and better surface quality.

[0050] Preferably, the outer materials of the first mold and the second mold each independently include hard alloy steel.

[0051] Preferably, the cores of the first mold and the second mold each independently include a polycrystalline core.

[0052] Preferably, the entrance angles of the first mold and the second mold are each independently 60°±3°, for example, 57°, 58°, 59°, 60°, 61°, 62° or 63°.

[0053] The present invention preferably has the entrance angles of the first die and the second die independently set to 60°±3°. Enlarging the entrance angles can facilitate the insertion of the second and third layers of wire, which is beneficial for obtaining a steel wire rope product with high breaking strength.

[0054] Preferably, the compression zone angles of the first mold and the second mold are independently 45°±1°, for example, 44°, 44.5°, 45°, 45.5° or 46°.

[0055] Preferably, the outlet angles of the first die and the second die are independently 53°±2°, for example, 51°, 51.2°, 52°, 52.5°, 53°, 54° or 55°.

[0056] Preferably, the twist direction of the rope twisted in step (3) is S twist.

[0057] Preferably, the lay length of the S twist is 10 to 11.5 times the diameter of the twisted steel wire rope, for example, it can be 10 times, 10.3 times, 10.4 times, 10.5 times, 10.7 times, 11 times or 11.5 times.

[0058] Preferably, the post-deformation stress relief treatment in step (4) is performed using two sets of deformation devices.

[0059] Preferably, each group of deformation devices includes a transverse deformer and a vertical deformer.

[0060] Preferably, the center distances between adjacent pulleys in the transverse deformer and the vertical deformer are independently 28-35 mm, for example, 28 mm, 29 mm, 30 mm, 32 mm, 33 mm or 35 mm.

[0061] In the present invention, the center distance between adjacent pulleys in the horizontal deformer and the vertical deformer should be controlled to be greater than the lay pitch of the twisted rope, preferably 28 to 35 mm.

[0062] The numerical range described in the present invention not only includes the point values ​​listed above, but also includes any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0063] As a preferred technical solution of the present invention, the production method comprises the following steps:

[0064] (1) A 304 stainless steel busbar having a strength of 720 to 780 MPa and an elongation of 35% to 45% is wet-drawn at an oil temperature of ≤45°C with a surface reduction ratio of 91.4 to 92.5% to obtain a stainless steel wire; the stainless steel wire is divided into a center wire, a second layer wire and a third layer wire; the third layer wire comprises a No. 1 third layer wire and a No. 2 third layer wire; after the wet-drawing, the diameter ratio of the center wire, the second layer wire, the No. 1 third layer wire and the No. 2 third layer wire is 39:35:28:35; the strength of the stainless steel wire is greater than 1960 MPa, the circle diameter is greater than 15 cm, and the number of twists is greater than 40 times;

[0065] (2) Step (1) The center wire, six second-layer wires and the third-layer wires are respectively passed through one center hole, six second-layer positioning holes and twelve third-layer positioning holes of the distribution disk, and the center wire and the second-layer wire enter a first mold with a hole size of 1.02-1.03 mm and a sizing band length of 0.7-1.7 mm for twisting and drawing to obtain a center strand; the material of the distribution disk includes iron; the material of the center hole, the second-layer positioning holes and the third-layer positioning holes of the distribution disk each independently includes hard alloy steel; the angle between the center line of the second-layer positioning holes and the center line of the distribution disk is 60°; the distance between the center of the second-layer positioning holes and the center of the distribution disk is 34-40 mm; the angle between the center line of the third-layer positioning holes and the center line of the distribution disk is 30°; the distance between the center of the third-layer positioning holes and the center of the distribution disk is 44-50 mm; the No. 1 third-layer wire and the No. 2 third-layer wire are staggered through the third positioning holes;

[0066] (3) In step (2), the central strand and the third layer of wire enter a second die having an aperture of 1.502 to 1.518 mm and a sizing band length of 0.87 to 1.87 mm for drawing and twisting with a twist pitch of 10 to 11.5 times the diameter of the twisted steel wire rope and an S twist direction to obtain a twisted steel wire rope; the outer material of the first die and the second die independently comprises carbide steel; the cores of the first die and the second die independently comprise a polycrystalline core; the inlet angles of the first die and the second die independently are 60°±3°; the compression zone angles of the first die and the second die independently are 45°±1°; the outlet angles of the first die and the second die independently are 53°±2°;

[0067] (4) After twisting in step (3), the steel wire rope is subjected to post-deformation stress relief treatment to obtain a steel wire rope product; the post-deformation stress relief process is carried out using two sets of deformation devices; each set of the deformation devices includes a transverse deformer and a vertical deformer; the center distances between adjacent pulleys in the transverse deformer and the vertical deformer are independently 28 to 35 mm.

[0068] In a second aspect, the present invention further provides a steel wire rope, which is produced by the production method described in the first aspect.

[0069] The steel wire rope of the present invention has a large breaking tensile force, high dimensional accuracy, certain flexibility and a smoother surface, and can be used on brakes and transmissions of high-end fitness equipment and high-end bicycles / motorcycles, so that it has a higher safety factor and service life.

[0070] Compared with the prior art, the present invention has at least the following beneficial effects:

[0071] (1) The production method of double-die drawing and single-shot forming of steel wire rope provided by the present invention adopts a stainless steel busbar with a reasonable wire diameter ratio and certain quality requirements, passes through a distribution plate and two molds, and obtains 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 ±0.003mm, and the breaking force can reach more than 3050N;

[0072] (2) The production method of double-mold drawing and single-shot forming of steel wire rope provided by the present invention is simple to operate, has low production cost, and is suitable for large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Figure 1 It is a main view of a distribution disk in a production method for double-mode drawing and single-shot forming of a steel wire rope provided by the present invention.

[0074] Figure 2It is a cross-sectional view of a wire distribution plate and a first mold and a second mold in a production method for double-mold drawing and single-shot molding of a steel wire rope provided by the present invention.

[0075] Figure 3 It is a front view of the first mold in a production method for double-mold drawing and single-shot molding of a steel wire rope provided by the present invention.

[0076] In the figure: 1: center hole; 2-7: second layer positioning holes; 8-19: third layer positioning holes; 20: distribution plate; 21: first mold; 22: second mold. DETAILED DESCRIPTION

[0077] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0078] The present invention is further described in detail below. However, the following examples are only simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0079] Example 1

[0080] This embodiment provides a production method for double-mold drawing and single-shot forming of a steel wire rope, the production method comprising the following steps:

[0081] (1) 304 stainless steel busbars (C: 0.042%, Cr: 18.6%, Ni: 8.25%, Mn: 0.69%, Si: 0.30%, P: 0.032%, S: 0.003%, N: 0.008%, the balance being Fe and unavoidable impurities) with diameters of 1.0 mm, 1.2 mm and 1.4 mm, strength of 750 MPa and elongation of 40% were wet drawn at an oil temperature of 40 °C. The stainless steel busbar is subjected to 16 passes of polycrystalline die drawing, with a surface reduction rate of 92.2%, and is drawn into a stainless steel wire with a diameter of 0.28 mm; the 304 stainless steel busbar with a diameter of 1.2 mm is subjected to 16 passes of polycrystalline die drawing, with a surface reduction rate of 91.5%, and is drawn into a stainless steel wire with a diameter of 0.35 mm; the 304 stainless steel busbar with a diameter of 1.4 mm is subjected to 15 passes of polycrystalline die drawing, with a surface reduction rate of 92.2%, and is drawn into a stainless steel wire with a diameter of 0.39 mm; the stainless steel wire is divided into a center wire, a second layer wire and a third layer wire;

[0082] The strength of the 0.28mm diameter stainless steel wire is 2150MPa, the circle diameter is 17cm, and the number of twists is 62 times; the strength of the 0.35mm diameter stainless steel wire is 2150MPa, the circle diameter is 25cm, and the number of twists is 65 times; and the strength of the 0.39mm diameter stainless steel wire is 2100MPa, the circle diameter is 28cm, and the number of twists is 48 times;

[0083] (2) The central wire with a diameter of 0.39 mm, the six second-layer wires with a diameter of 0.35 mm, and the third-layer wires of step (1) are respectively passed through the distribution plate (such as Figure 1 and Figure 2 The center wire and the second layer wire enter the first mold (as shown) with a hole size of 1.02mm and a sizing belt length of 1.2mm. Figure 3 The wire distribution disk is made of iron; the center hole, the second layer positioning hole and the third layer positioning hole of the wire distribution disk are made of carbide steel; the angle between the center line of the second layer positioning hole and the center line of the wire distribution disk is 60°; the distance between the center of the second layer positioning hole and the center of the wire distribution disk is 36mm; the angle between the center line of the third layer positioning hole and the center line of the wire distribution disk is 30°; the distance between the center of the third layer positioning hole and the center of the wire distribution disk is 47mm;

[0084] (3) Step (2) The center strand and the third layer of wire enter a second die with an aperture of 1.51 mm and a sizing band length of 1.37 mm for drawing and twisting with a twist pitch of 15 mm, 11 times the diameter of the twisted wire rope, and an S twist direction to obtain a twisted wire rope; the outer materials of the first die and the second die are both hard alloy steel; the cores of the first die and the second die are both polycrystalline cores; the entrance angle of the first die is 60°; the entrance angle of the second die is 62°; the compression zone angle of the first die is 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 wires includes six No. 1 third layer wires with a diameter of 0.35 mm and six No. 2 third layer wires with a diameter of 0.28 mm; the six No. 1 third layer wires with a diameter of 0.35 mm and the six No. 2 third layer wires with a diameter of 0.28 mm are staggered through the third positioning hole;

[0085] (4) After twisting in step (3), the steel wire rope is subjected to post-deformation stress relief treatment to obtain a steel wire rope product; the post-deformation stress relief process is carried out using two groups of deformation devices; each group of the deformation devices includes a transverse deformer and a vertical deformer; the center distances between adjacent pulleys in the transverse deformer and the vertical deformer are each independently 30 mm.

[0086] Example 2

[0087] This embodiment provides a production method for double-mold drawing and single-shot forming of a steel wire rope, the production method comprising the following steps:

[0088] (1) 304 stainless steel busbars with diameters of 1.2 mm, 1.4 mm and 1.5 mm, strengths of 720 MPa and elongations of 35% were wet drawn at an oil temperature of 45° C., wherein: the 304 stainless steel busbar with a diameter of 1.2 mm was subjected to 17 passes of polycrystalline die drawing, with a surface reduction rate of 91.4%, and was drawn into a stainless steel wire with a diameter of 0.34 mm; the 304 stainless steel busbar with a diameter of 1.4 mm was subjected to 17 passes of polycrystalline die drawing, with a surface reduction rate of 92%, and was drawn into a stainless steel wire with a diameter of 0.41 mm; the 304 stainless steel busbar with a diameter of 1.5 mm was subjected to 13 passes of polycrystalline die drawing, with a surface reduction rate of 92%, and was drawn into a stainless steel wire with a diameter of 0.44 mm; the stainless steel wires were divided into a center wire, a second layer wire and a third layer wire;

[0089] The strength of the 0.34mm diameter stainless steel wire is 1980MPa, the circle diameter is 17cm, and the number of twists is 42 times; the strength of the 0.41mm diameter stainless steel wire is 2150MPa, the circle diameter is 15cm, and the number of twists is 55 times; and the strength of the 0.44mm diameter stainless steel wire is 2050MPa, the circle diameter is 21cm, and the number of twists is 48 times;

[0090] (2) In step (1), the center wire with a diameter of 0.44 mm, six No. 1 third-layer wires with a diameter of 0.41 mm, and the third-layer wires are respectively passed through the center hole, the second-layer positioning hole, and the third-layer positioning hole of the distribution disk, and the center wire and the second-layer wire enter the first mold with a hole size of 1.025 mm and a sizing band length of 0.7 mm for twisting and drawing to obtain a center strand; the material of the distribution disk includes iron; the material of the center hole, the second-layer positioning hole, and the third-layer positioning hole of the distribution disk each independently includes hard alloy steel; the angle between the center line of the second-layer positioning hole and the center line of the distribution disk is 60°; the distance between the center of the second-layer positioning hole and the center of the distribution disk is 40 mm; the angle between the center line of the third-layer positioning hole and the center line of the distribution disk is 30°; the distance between the center of the third-layer positioning hole and the center of the distribution disk is 44 mm;

[0091] (3) In step (2), the center strand and the third layer wire are respectively passed through a second die with an aperture size of 1.518 mm and a sizing band length of 0.87 mm for drawing and twisting with a twist pitch of 11.5 times the diameter of the twisted wire rope and an S twist direction to obtain a twisted wire rope; the outer materials of the first die and the second die are both hard alloy steel; the cores of the first die and the second die are both polycrystalline cores; the inlet angle of the first die is 59°; the inlet angle of the second die is 63°, the compression zone angle of the first die is 44°; the compression zone angle of the second die is 44.5°; the outlet angle of the first die is 53.5°; the outlet angle of the second die is 54°; the third layer wires include six No. 1 third layer wires with a diameter of 0.41 mm and six No. 2 third layer wires with a diameter of 0.34 mm; the six No. 1 third layer wires with a diameter of 0.41 mm and the six No. 2 third layer wires with a diameter of 0.34 mm are staggered and passed through the third positioning hole;

[0092] (4) After twisting in step (3), the steel wire rope is subjected to post-deformation stress relief treatment to obtain a steel wire rope product; the post-deformation stress relief process is carried out using two sets of deformation devices; each set of the deformation devices includes a transverse deformer and a vertical deformer; the center distances between adjacent pulleys in the transverse deformer and the vertical deformer are each independently 28 mm.

[0093] Example 3

[0094] This embodiment provides a production method for double-mold drawing and single-shot forming of a steel wire rope, the production method comprising the following steps:

[0095] (1) 304 stainless steel busbars with diameters of 1.0 mm, 1.2 mm and 1.5 mm, strengths of 780 MPa and elongations of 45% were wet drawn at an oil temperature of 38° C., wherein: the 304 stainless steel busbar with a diameter of 1.0 mm was subjected to 16 polycrystalline die drawing passes, with a surface reduction rate of 92.2%, and was drawn into a stainless steel wire with a diameter of 0.28 mm; the 304 stainless steel busbar with a diameter of 1.2 mm was subjected to 17 polycrystalline die drawing passes, with a surface reduction rate of 91.4%, and was drawn into a stainless steel wire with a diameter of 0.34 mm; the 304 stainless steel busbar with a diameter of 1.5 mm was subjected to 13 polycrystalline die drawing passes, with a surface reduction rate of 92%, and was drawn into a stainless steel wire with a diameter of 0.44 mm; the stainless steel wires were divided into a center wire, a second layer wire and a third layer wire;

[0096] The strength of the 0.28 mm diameter stainless steel wire, the 0.34 mm diameter stainless steel wire and the 0.44 mm diameter stainless steel wire are all 2050 MPa, the circle diameter is all 26 cm, and the number of twists is all 44 times;

[0097] (2) In step (1), the center wire with a diameter of 0.44 mm, six second-layer wires with a diameter of 0.34 mm, and the third-layer wires are respectively passed through the center hole, the second-layer positioning hole, and the third-layer positioning hole of the distribution disk, and the center wire and the second-layer wire enter a first mold with a hole size of 1.03 mm and a sizing band length of 1.7 mm for twisting and drawing to obtain a center strand; the distribution disk is made of iron; the center hole, the second-layer positioning hole, and the third-layer positioning hole of the distribution disk are made of cemented carbide steel independently; the center line of the second-layer positioning hole and the center line of the distribution disk are at an angle of 60°; the distance between the center of the second-layer positioning hole and the center of the distribution disk is 34 mm; the center line of the third-layer positioning hole and the center line of the distribution disk are at an angle of 30°; the distance between the center of the third-layer positioning hole and the center of the distribution disk is 50 mm;

[0098] (3) In step (2), the center strand and the third layer wire are respectively passed through a second die with an aperture size of 1.502 mm and a sizing band length of 1.87 mm for drawing and twisting with a twist pitch of 10 times the diameter of the twisted wire rope and an S twist direction to obtain a twisted wire rope; the outer materials of the first die and the second die are both hard alloy steel; the cores of the first die and the second die are both polycrystalline cores; the entrance angle of the first die is 57°; the entrance angle of the second die is 63°, 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 is 53.5°; the exit angle of the second die is 55°; the third layer wires include six 0.34 mm diameter No. 1 third layer wires and six 0.28 mm diameter No. 2 third layer wires; the six 0.34 mm diameter No. 1 third layer wires and the six 0.28 mm diameter No. 2 third layer wires are staggered and passed through the third positioning hole;

[0099] (4) After twisting in step (3), the steel wire rope is subjected to post-deformation stress relief treatment to obtain a steel wire rope product; the post-deformation stress relief process is carried out using two sets of deformation devices; each set of the deformation devices includes a transverse deformer and a vertical deformer; the center distances between adjacent pulleys in the transverse deformer and the vertical deformer are each independently 35 mm.

[0100] Example 4

[0101] The present embodiment provides a production method for double-mode drawing and single-forming of a steel wire rope. The production method is the same as that of Example 1 except that the "304 stainless steel busbars with diameters of 1.0 mm, 1.2 mm and 1.4 mm, strengths of 750 MPa and elongations of 40%" in step (1) are replaced by "304 stainless steel busbars with diameters of 0.8 mm, strengths of 750 MPa and elongations of 40%".

[0102] Example 5

[0103] The present embodiment provides a production method for double-mode drawing and single-forming of a steel wire rope. In the production method, except that the "304 stainless steel busbars with diameters of 1.0 mm, 1.2 mm and 1.4 mm, a strength of 750 MPa and an elongation of 40%" in step (1) are replaced by "304 stainless steel busbars with diameters of 1.0 mm, 1.2 mm and 1.4 mm, a strength of 800 MPa and an elongation of 25%", the rest are the same as in Example 1.

[0104] Example 6

[0105] The present embodiment provides a production method for double-die drawing and single-shot forming of a steel wire rope, wherein the production method is the same as that of Embodiment 1 except that "the length of the sizing band of the first die is 1.2 mm" in step (3) is replaced by "the length of the sizing band of the first die is 2.1 mm".

[0106] Example 7

[0107] The present embodiment provides a production method for single-shot double-die drawing of a steel wire rope, which is the same as that of Embodiment 1 except that "the length of the sizing band of the first die is 1.2 mm" in step (3) is replaced by "the length of the sizing band of the first die is 0.5 mm".

[0108] Example 8

[0109] The present embodiment provides a production method for double-mode drawing and single-shot forming of a steel wire rope, and the production method is the same as that of Embodiment 1 except that "the entrance angle of the first mold is 60°" in step (3) is replaced by "the entrance angle of the first mold is 45°".

[0110] Comparative Example 1

[0111] This comparative example provides a method for producing a steel wire rope, which is the same as Example 1 except that in step (3), the center strand does not pass through the first mold, and the center strand and the third layer of wire do not enter the second mold, but directly enter the stranding machine to twist and form a rope.

[0112] Comparative Example 2

[0113] This comparative example provides a method for producing a steel wire rope, which is the same as Example 1 except that step (2) is deleted and a center wire with a diameter of 0.39 mm, six second-layer wires with a diameter of 0.35 mm, six No. 1 third-layer wires with a diameter of 0.35 mm and six No. 2 third-layer wires with a diameter of 0.28 mm are simultaneously passed through a distribution disk into a second mold.

[0114] The breaking tensile force of the steel wire rope products obtained in the above embodiments and comparative examples was measured using the actual breaking tensile force measurement method of GB / T 8358. The results are shown in Table 1.

[0115] Table 1

[0116] Dimensional accuracy (mm) Breaking force(N) Is the surface smooth? Example 1 ±0.001 3695 yes Example 2 ±0.003 3325 yes Example 3 ±0.002 3275 yes Example 4 ±0.002 2865 yes Example 5 ±0.002 3050 yes Example 6 ±0.001 3573 yes Example 7 ±0.001 3645 yes Example 8 ±0.001 3450 yes Comparative Example 1 ±0.005 2700 no Comparative Example 2 ±0.003 3057 no

[0117] From Table 1 we can see that:

[0118] (1) It can be seen from Examples 1 to 8 that the steel wire rope product obtained by the production method of double-die drawing and single forming of the steel wire rope provided by the present invention has high dimensional accuracy, large breaking tensile force, and smooth surface, wherein the dimensional accuracy can reach less than ±0.003 mm, and the breaking tensile force can reach more than 3050 N;

[0119] (2) Combining Example 1 and Example 4, it can be seen that Example 1 uses 304 stainless steel busbars with diameters of 1.0 mm, 1.2 mm and 1.4 mm, strengths of 750 MPa and elongations of 40%. Compared with Example 4 using 304 stainless steel busbars with diameters of 0.8 mm, strengths of 750 MPa and elongations of 40%, since both Example 1 and Example 4 ultimately draw the busbars into stainless steel wires with diameters of 0.28 mm, 0.35 mm and 0.39 mm, respectively, the surface reduction rate of wet drawing in Example 4 is not within the preferred surface reduction rate range of 91.4-92.5%, and the breaking tension of the final steel wire rope product is only 2865 N, which is much lower than the breaking tension of 3695 N in Example 1. This shows that the present invention further limits the surface reduction rate of the stainless steel busbar within a specific range, which can ensure that the obtained steel wire rope product has a large breaking tension.

[0120] (3) Combining Example 1 and Example 5, it can be seen that Example 1 uses 304 stainless steel busbars with diameters of 1.0 mm, 1.2 mm and 1.4 mm, strengths of 750 MPa and elongations of 40%. Compared with Example 5 using 304 stainless steel busbars with diameters of 1.0 mm, 1.2 mm and 1.4 mm, strengths of 800 MPa and elongations of 25%, the strength of the 304 stainless steel busbars with different diameters in Example 5 is higher than that in Example 1. As the strength of the 304 stainless steel busbar increases, its elongation decreases, which is 25% in Example 5, lower than the elongation in Example 1, resulting in a significant reduction in the breaking tension of the final steel wire rope product to 3050 N, which is much lower than the breaking tension of 3695 N in Example 1. This shows that the present invention further limits the strength and elongation of the stainless steel busbar within a specific range, which can ensure that the obtained steel wire rope product has a large breaking tension.

[0121] (4) Combining Example 1 with Examples 6-7, it can be seen that the length of the sizing tape of the first die in Example 1 is 1.2 mm. Compared with the lengths of the sizing tape of the first die in Examples 6-7 being 2.1 mm and 0.5 mm respectively, the dimensional accuracy of the steel wire rope products obtained in Examples 6-7 is the same as that in Example 1, and the surface is smooth, and only the breaking tensile force is slightly lower than that in Example 1; thus, it is shown that the present invention further limits the length of the sizing tape of the first die to a specific range, which can improve the breaking tensile force of the final steel wire rope product;

[0122] (5) Combining Example 1 and Example 8, it can be seen that the entrance angle of the first die in Example 1 is 60°, compared with the entrance angle of the first die in Example 8 being 45°, the dimensional accuracy of the steel wire rope product obtained in Example 8 is the same as that in Example 1, both of which are ±0.001 mm, but the breaking tensile force is smaller than that in Example 1, which is 3450 N; this shows that the present invention further limits the entrance angle of the first die to a specific range, which can ensure that the obtained steel wire rope product has a larger breaking tensile force;

[0123] (6) It can be seen from the combination of Example 1 and Comparative Examples 1-2 that in Example 1, the center strand passes through the first die and the center strand and the third layer of wire enter the second die, i.e., a dual-die drawing process. Compared with Comparative Example 1 in which the center strand does not pass through the first die and the center strand and the third layer of wire do not enter the second die, i.e., a mold-free process, and Comparative Example 2 in which the center wire and the second layer of wire do not enter the first die to form the center strand but directly enter the second die together with the third layer of wire, i.e., a single-die drawing process, the steel wire rope product obtained in Example 1 has high dimensional accuracy, high breaking force and a smooth surface, while the steel wire rope product obtained in Comparative Example 1 has a low dimensional accuracy of ±0.005 mm and a breaking force of only 2700 N, and a rough surface. The dimensional accuracy and breaking force of the steel wire rope obtained in Comparative Example 2 are improved over those in Comparative Example 1, but are still lower than those in Example 1, and the surface of the steel wire rope is not smooth. This shows that the present invention can obtain a steel wire rope product with high dimensional accuracy, high breaking force and a smooth surface by adopting a dual-die drawing process.

[0124] In summary, the production method of double-die drawing and single-forming of steel wire rope provided by the present invention adopts a stainless steel busbar with a reasonable wire diameter ratio and certain quality requirements, passes through a distribution disk and two molds, and obtains a 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 promotion and application.

[0125] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A production method for double-mode drawing and single-shot forming of steel wire ropes, It is characterized in that The production method comprises the following steps: (1) The stainless steel busbar is drawn to obtain a stainless steel wire; the stainless steel wire is divided into a center wire, a second layer wire and a third layer wire; The stainless steel busbar comprises a 304 stainless steel busbar; the 304 stainless steel busbar comprises the following components by mass percentage: C: 0.042-0.048%, Cr: 18.3-18.6%, Ni: 8.20-8.30%, Mn: 0.67-0.90%, Si: 0.29-0.35%, P≤0.032%, S≤0.003%, N≤0.008%, and the remainder is Fe and unavoidable impurities; the strength of the 304 stainless steel busbar is 720-780 MPa; The elongation of the 304 stainless steel busbar is 35% to 45%; the drawing includes wet drawing; the wet drawing makes the area reduction rate of the 304 stainless steel busbar 91.4 to 92.5%; the third layer wire includes a No. 1 third layer wire and a No. 2 third layer wire, and after the wet drawing, the diameter ratio of the center wire, the second layer wire, the No. 1 third layer wire and the No. 2 third layer wire is 39:35:28:35; the strength of the stainless steel wire is greater than 1960MPa; the ring diameter of the stainless steel wire is greater than 15cm; the number of torsion of the stainless steel wire is greater than 40 times; (2) The center wire, the second layer wire and the third layer wire of step (1) pass through the center hole, the second layer positioning hole and the third layer positioning hole of the distribution plate respectively, and the center wire and the second layer wire enter the first mold for twisting and drawing to obtain the center strand; The distribution plate includes 1 center hole, 6 second-layer positioning holes and 12 third-layer positioning holes, the angle between the center line of the second-layer positioning holes and the center line of the distribution plate is 60°, and the angle between the center line of the third-layer positioning holes and the center line of the distribution plate is 30°; the aperture size of the first mold is 1.02-1.03 mm; the length of the sizing belt of the first mold is 0.7-1.7 mm; (3) The central strand and the third layer of wire in step (2) enter a second die for drawing and twisting to obtain a twisted steel wire rope; The aperture size of the second die is 1.502-1.518 mm; the length of the sizing belt of the second die is 0.87-1.87 mm; the twist direction of the twisted rope is S twist, and the twist length of the S twist is 10-11.5 times the diameter of the twisted steel wire rope; (4) The twisted steel wire rope in step (3) is subjected to post-deformation stress relief treatment to obtain a steel wire rope product; Among them, the inlet angles of the first mold and the second mold are each independently 60°±3°; the compression zone angles of the first mold and the second mold are each independently 45°±1°; and the outlet angles of the first mold and the second mold are each independently 53°±2°.

2. The production method according to claim 1, It is characterized in that The oil temperature of the wet drawing is ≤45°C.

3. The production method according to claim 1, It is characterized in that The material of the distribution plate includes iron.

4. The production method according to claim 1, It is characterized in that The materials of the center hole, the second layer positioning holes and the third layer positioning holes of the distribution plate are independently made of hard alloy steel.

5. The production method according to claim 1, It is characterized in that The distance between the center of the second layer positioning hole and the center of the distribution plate is 34-40 mm.

6. The production method according to claim 1, It is characterized in that The distance between the center of the third layer positioning hole and the center of the distribution plate is 44-50 mm.

7. The production method according to claim 1, It is characterized in that The six No. 1 third-layer wires and the six No. 2 third-layer wires are staggered and passed through the third-layer positioning holes.

8. The production method according to claim 1, It is characterized in that The outer materials of the first mold and the second mold each independently include hard alloy steel; the cores of the first mold and the second mold each independently include polycrystalline cores.

9. The production method according to claim 1, It is characterized in that The post-deformation stress relief treatment in step (4) is performed using two sets of deformation devices; each set of deformation devices includes a horizontal deformer and a vertical deformer.

10. The production method according to claim 9, It is characterized in that The center distances between adjacent pulleys in the transverse deformer and the vertical deformer are independently 28-35 mm.

11. A steel wire rope, It is characterized in that The steel wire rope is produced by the production method described in any one of claims 1 to 10.

Images