Method for producing a synchronous rotating steel wire rope

Abstract

The application provides a synchronous rotating steel wire rope production method, comprising the following steps: material selection, selecting 304 stainless steel wire with a diameter of 5.5±0.25 mm; continuous drawing, using a wire drawing machine to draw the 5.5±0.25 mm steel wire into 1.6±0.02 mm steel wire; pickling, using a solution with an acid concentration of 9%-10% for cleaning; large annealing, the steel wire passes through eight annealing zones in a large annealing furnace at a speed of 19.45 m / min; first water tank drawing, using a wire drawing machine to draw the steel wire into 0.55±0.01 mm steel wire; small annealing, the steel wire passes through three annealing zones in a small annealing furnace at a speed of 15.0 m / min; second water tank drawing, using a wire drawing machine to draw the 0.55±0.01 mm steel wire into 0.162±0.01 mm and 0.182±0.01 mm steel wire respectively; twisting, using a double twisting machine to twist six edge wires around a center wire in an S direction into a 1×7 structure synchronous rotating steel wire rope; finishing, improving the qualified rate of unqualified stainless steel wire rope through corresponding processes, and improving the synchronous rotation of the stainless steel wire rope through four processes of wire diameter ratio adjustment, water tank drawing, wire twisting and wire annealing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel wire rope, in particular to a production method of synchronous rotating steel wire rope. BACKGROUND

[0002] In the field of endoscope and endoscope instrument, on the one hand, the steel wire rope needs to have high flexibility so that the steel wire rope can be bent in the patient's body, on the other hand, the angle of the steel wire rope needs to be rotated to find the position of the organ with lesions, and the steel wire rope also needs to have good synchronous rotating performance. The flexibility and the synchronous rotating performance of the steel wire rope are contradictory to each other, the better the flexibility of the steel wire rope, the worse the synchronous rotating performance, and the better the synchronous rotating performance, the higher the hardness of the steel wire rope, which leads to the worse flexibility of the steel wire rope. How to make the steel wire rope have good flexibility and high synchronous rotating performance is a difficult problem in the field of rope making. SUMMARY

[0003] The purpose of the present application is to solve the problems existing in the prior art, and a production method of synchronous rotating steel wire rope is provided.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] The production method of the synchronous rotating steel wire rope comprises the following steps:

[0006] S1: material selection, selecting 304 stainless steel wire with a diameter of 5.5±0.25mm and a smooth surface without hard grinding scratches, cracks, skin buckling and flash;

[0007] S2: continuous drawing, using a wire drawing machine to draw the steel wire rope with a diameter of 5.5±0.25mm to a steel wire rope with a diameter of 1.6±0.02mm through nine passes, and the drawing process is as follows: 4.2-3.4-2.9-2.6-2.3-2.1-

[0008] 1.9-1.75-1.6, and the lubricating powder needs to cover the steel wire rope without coking phenomenon, and the cooling water needs to be kept normal circulation;

[0009] S3: pickling, the drawn steel wire rope passes through an acid concentration of 9%-10% pickling tank, and the pickling tank liquid level is higher than the steel wire rope;

[0010] S4: large annealing, the pickled steel wire rope enters the large annealing furnace, the steel wire rope passes through eight annealing zones in the large annealing furnace at a speed of 19.45m / min, and ammonia gas is sprayed on the steel wire rope by the ammonia decomposition furnace, and the steel wire rope is cooled by cooling water after annealing;

[0011] S5: First water tank drawing: Using a wire drawing machine, the annealed steel wire rope is drawn to a thickness of 0.55±0.01mm through twelve drawing passes. The drawing process is as follows: 1.56-1.42-1.29-

[0012] 1.17-1.6-0.96-0.87-0.79-0.72-0.66-0.60-0.55, during the drawing process, a lubricant with a temperature of 40±5℃, a concentration of 3.0%-4.0%, and a pH of 8.0-8.5 is applied to the wire rope;

[0013] S6: Small annealing. The steel wire rope after being drawn from the water tank passes through the three annealing zones of the small annealing furnace at a speed of 15.0 m / min. At the same time, the ammonia decomposition furnace sprays ammonia gas onto the steel wire rope. After annealing, the steel wire rope is cooled with cooling water.

[0014] S7: Second water tank drawing: Using a wire drawing machine, the cooled 0.55±0.01mm steel wire rope is drawn to 0.162±0.01mm as the edge wire of the synchronous rotating steel wire rope, and 0.182±0.01mm as the center wire of the synchronous rotating steel wire rope. During the drawing process, a lubricant with a temperature of 40±5℃, a concentration of 4.0%-5.0%, and a pH of 8.5-9.0 is applied to the steel wire rope.

[0015] S8: Twisting step, using a double twisting machine to twist the six edge wires around the center wire in the S direction to form a synchronous rotating steel wire rope with a 1×7 structure and a diameter of 0.49-0.51mm;

[0016] S9: Fine finishing, the twisted synchronous rotating steel wire rope is cooled with cooling water at a temperature of 26℃, cleaned with 1.6-2.0 mol of hydrogen and a solution with a pH of 9-11, and cleaned with 3.5MHz ultrasonic waves.

[0017] Preferably, the chemical composition of the stainless steel wire in step S1 is: C: 0.034%, Si: 0.31%, Mn: 0.71%, P: 0.131%, S: 0.002%, Cr: 18.03%, Ni: 8.02%, Cu: 0.3%, Mo: 0.02%, N: 0.05%.

[0018] Preferably, the temperatures of the eight annealing zones in step S4 are 990±10℃, 1080±5℃, 1085±5℃, 1085±5℃, 1085±5℃, 1085±5℃, 1080±5℃, and 1080±5℃, respectively.

[0019] Preferably, the temperatures of the three annealing zones in step S6 are 1050±30℃, 1060±10℃, and 1060±20℃, respectively.

[0020] Preferably, in step S7, the loop diameter is ≥100mm, the warp distance is ≤2mm, and the single filament knotting rate is ≥55%.

[0021] Preferably, in step S8, the twisting machine speed is 2500 rpm, the pressing die is 0.55 mm, and the twist pitch is 4.0 mm.

[0022] Preferably, in steps S2 and S3, the steel wool used for cleaning in the cleaning tank and pickling tank must completely cover the steel wool rope, and the steel wool must be fixed with the weight provided by the equipment.

[0023] Preferably, in step S4, the wire strength is 570-830 MPa and the elongation is ≥30%; in step S5, the single wire strength is 1670-1930 MPa; in step S6, the wire strength is 600-870 MPa and the elongation is ≥20%; and in step S7, the single wire strength is 1730-2000 MPa.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. Control the moving speed and temperature of the stainless steel wire in each annealing zone during the large and small annealing processes to improve the synchronous rotation of the wire rope while ensuring sufficient flexibility.

[0026] 2. During the second water tank pull-out, adjust the winding method of the tower wheel to control the coil diameter and warp distance of the stainless steel wire, and control the moving speed of the stainless steel wire to improve the synchronous rotation of the stainless steel wire.

[0027] 3. In the twisting step, the synchronous rotation of the wire rope is further improved by adjusting and solidifying the wire release tension, tooling standards, routing requirements, and wire rope torsion. Attached Figure Description

[0028] Figure 1 This is a flowchart of the synchronous rotating wire rope production process according to Embodiment 1 of the present invention. Detailed Implementation

[0029] To provide a further understanding of the purpose, structure, features, and functions of the present invention, detailed descriptions are provided below with reference to specific embodiments.

[0030] The production method of synchronous rotating wire rope includes:

[0031] S1: Material selection. 304 stainless steel wire with a diameter of 5.5±0.25mm is selected, with a smooth surface free from hard abrasions, scratches, cracks, peeling, and burrs. Using 304 stainless steel wire with no surface defects prevents breakage during drawing or affects the synchronous rotation of the formed wire rope. It also reduces drawing friction, lowers die wear, and improves the uniformity of wire surface quality and mechanical properties. 304 stainless steel wire has good ductility and corrosion resistance, making it less prone to breakage during drawing. The twisted wire rope exhibits corrosion resistance and has an extended service life.

[0032] S2: Continuous drawing, using a wire drawing machine to draw a 5.5±0.25mm steel wire rope to a 1.6±0.02mm steel wire rope through nine drawing passes. The drawing process is as follows: 4.2-3.4-2.9-2.6-2.3-2.1-

[0033] 1.9-1.75-1.6, and at the same time, during the drawing process, the lubricating powder must cover the wire rope without coking, and the cooling water should maintain normal circulation. The 5.5±0.25mm wire rope reaches the appropriate wire diameter after multiple drawing processes. The lubricating powder forms a lubricating film between the wire rope and the drawing die wall, reducing interface friction, reducing energy consumption, and having good extensibility and lubricity. It can not only be firmly adsorbed on the surface of the wire rope, but also be extended and deformed with the wire rope and is easy to remove.

[0034] S3: Pickling. After drawing, the steel wire rope passes through a pickling tank with an acid concentration of 9%-10%, and the liquid level in the pickling tank is higher than the steel wire rope. The steel wire rope passes through the 9%-10% pickling tank, and the pickling solution in the pickling tank maintains a normal water flow rate to remove the oxide film on the surface of the steel wire rope. The pickling solution completely covers the entire steel wire rope, so that the oxide film on the steel wire rope is completely removed.

[0035] S4: Large annealing. After pickling, the steel wire rope enters the large annealing furnace. The steel wire rope passes through the eight annealing zones of the large annealing furnace at a speed of 19.45 m / min. At the same time, the ammonia decomposition furnace sprays ammonia gas onto the steel wire rope. After annealing, the steel wire rope is cooled with cooling water. The moving speed of the steel wire rope is controlled to ensure the time of the steel wire rope in each annealing zone and improve the synchronous rotation of the steel wire rope. The liquid ammonia is heated to 800±10℃ with a flow rate of 4±0.2, and the liquid ammonia is decomposed into hydrogen and nitrogen to protect the stainless steel wire, achieving a good bright and oxidation-free effect.

[0036] S5: First water tank drawing: Using a wire drawing machine, the annealed steel wire rope is drawn to a thickness of 0.55±0.01mm through twelve drawing passes. The drawing process is as follows: 1.56-1.42-1.29-

[0037] 1.17-1.6-0.96-0.87-0.79-0.72-0.66-0.60-0.55. During the drawing process, a lubricant with a temperature of 40±5℃, a concentration of 3.0%-4.0%, and a pH of 8.0-8.5 is applied to the steel wire rope. A water tank type wire drawing machine is used to draw the 0.55±0.01mm steel wire rope through twelve passes to obtain a wire rope with an output diameter of 0.55±0.01mm. The speed of the stainless steel wire is 168m / min. Selecting a lubricant concentration of 3.0%-4.0% according to the speed of the stainless steel wire can avoid burrs caused by friction during drawing and tearing caused by burrs. At the same time, it can reduce the tendency of stainless steel wire to stick, jam, and break by reducing stress.

[0038] S6: Small annealing. After being drawn from the water tank, the steel wire rope passes through the three annealing zones of the small annealing furnace at a speed of 15.0 m / min. At the same time, the ammonia decomposition furnace sprays ammonia gas onto the steel wire rope. After annealing, the steel wire rope is cooled with cooling water. The three annealing zones correspond to temperatures of 1050±30℃, 1060±10℃, and 1060±20℃, respectively. The flow rate in the ammonia decomposition furnace is adjusted according to the diameter of the steel wire rope to better protect the stainless steel wire, achieving a good bright and oxidation-free effect while preventing surface oxidation and decarburization of the stainless steel wire during heating.

[0039] S7: Second water tank drawing. Using a wire drawing machine, the cooled 0.55±0.01mm steel wire rope is drawn to 0.162±0.01mm as the edge wire of the synchronous rotating steel wire rope, and 0.182±0.01mm as the center wire of the synchronous rotating steel wire rope. During the drawing process, a lubricant with a temperature of 40±5℃, a concentration of 4.0%-5.0%, and a pH of 8.5-9.0 is applied to the steel wire rope. When drawing the water tank, the speed of the stainless steel wire is 300m / min. The concentration of the lubricant is selected according to the speed of the stainless steel wire to meet the requirements of high-speed drawing, prevent melting or sticking, and prevent the stainless steel wire from overheating. Adjusting the pH value of the lubricant can adjust the color of the stainless steel wire.

[0040] S8: Twisting step. Using a double twisting machine, the six edge wires are twisted around the center wire in the S direction to form a 1×7 structure with a diameter of 0.49-0.51mm for synchronous rotating steel wire rope. The double twisting machine produces finer wires, which is more suitable for twisting synchronous rotating steel wire rope. After twisting, the surface of the steel wire rope is smooth and free of burrs, broken wires, and splices. There is no saddle-like phenomenon, and the strands are vertical and do not unravel. The wires are tightly laid out and there are no uneven ends, bulges, or wire pressing phenomena.

[0041] S9: Fine finishing. The twisted synchronous rotating wire rope is cooled with cooling water at 26℃, cleaned with 1.6-2.0 mol of hydrogen and a solution with a pH of 9-11, and cleaned with 3.5MHz ultrasonic waves. For some twisted synchronous rotating wire ropes that do not meet the requirements, they are cooled again, flushed with hydrogen, cleaned with a solution with a pH of 9-11, and ultrasonically cleaned again to ensure that the unqualified synchronous rotating wire ropes meet the requirements in terms of flatness, perpendicularity, tension, torque, elasticity, rotation, and breaking aging.

[0042] Preferably, the chemical composition of the stainless steel wire in step S1 is: C: 0.034%, Si: 0.31%, Mn: 0.71%, P: 0.131%, S: 0.002%, Cr: 18.03%, Ni: 8.02%, Cu: 0.3%, Mo: 0.02%, N: 0.05%.

[0043] Preferably, the temperatures of the eight annealing zones in step S4 are 990±10℃, 1080±5℃, 1085±5℃, 1085±5℃, 1085±5℃, 1085±5℃, 1080±5℃, and 1080±5℃, respectively. By setting the temperatures of the eight annealing zones, the temperature and speed are reasonably matched to improve the synchronous rotation of the stainless steel wire rope.

[0044] Preferably, the temperatures of the three annealing zones in step S6 are 1050±30℃, 1060±10℃, and 1060±20℃, respectively.

[0045] Preferably, in step S7, the loop diameter is ≥100mm, the warp distance is ≤2mm, and the single filament knotting rate is ≥55%.

[0046] Preferably, in step S8, the twisting machine speed is 2500 rpm, the wire pressing die is 0.55 mm, and the lay length is 4.0 mm. The synchronous rotation of the wire rope is improved by adjusting and solidifying the wire release tension, tooling usage standards, wiring location requirements, and wire rope torsion to form standards.

[0047] Preferably, in steps S2 and S3, the steel wool used for cleaning in the cleaning tank and pickling tank must completely cover the stainless steel wire, and the steel wool must be fixed with the weight provided by the equipment. When the steel wire rope enters or exits the cleaning tank or pickling tank, the steel wool completely covering the stainless steel wire can completely remove impurities from the surface of the stainless steel wire.

[0048] Preferably, in step S4, the wire strength is 570-830 MPa and the elongation is ≥30%; in step S5, the single wire strength is 1670-1930 MPa; in step S6, the wire strength is 600-870 MPa and the elongation is ≥20%; and in step S7, the single wire strength is 1730-2000 MPa. By ensuring that the elongation and wire strength of the wire rope meet the corresponding requirements in different steps, the next process can be carried out more effectively, and a qualified synchronous rotating wire rope can be formed after molding.

[0049] In this embodiment, the stainless steel wire diameter ratio is adjusted by using cross-sectional geometry to determine the stainless steel wire diameter ratio; water tank pulling is used to control the coil diameter and warp distance of the stainless steel wire; stainless steel wire twisting is achieved by adjusting and solidifying the stainless steel wire tension, tooling standards, wiring requirements, and stainless steel wire rope twisting to form a standard; and stainless steel wire annealing is achieved by using a reasonable ratio of temperature and speed to ensure that the strength and elongation of the stainless steel wire meet the requirements.

[0050] The present invention has been described in the above-described embodiments; however, these embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. Conversely, any modifications and refinements made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A method for producing synchronous rotating steel wire rope, characterized by the following steps: S1: Material selection, using 304 stainless steel wire with a diameter of 5.5±0.25mm and a smooth surface, free from hard abrasions, cracks, peeling, and burrs; S2: Continuous drawing, using a wire drawing machine to draw a 5.5±0.25mm steel wire rope to a 1.6±0.02mm steel wire rope through nine drawing passes. The drawing process is as follows: 4.2-3.4-2.9-2.6-2.3-2.1- 1.9-1.75-1.6, and at the same time, during the drawing process, the lubricating powder must cover the wire rope and there should be no coking, and the cooling water should maintain normal circulation; S3: Pickling. The drawn steel wire rope passes through a pickling tank with an acid concentration of 9%-10%, and the liquid level in the pickling tank is higher than that of the steel wire rope. S4: Large annealing. The pickled wire rope enters the large annealing furnace and passes through eight annealing zones at a speed of 19.45 m / min. The temperatures of the eight annealing zones are 990±10℃, 1080±5℃, 1085±5℃, 1085±5℃, 1085±5℃, 1085±5℃, 1080±5℃, and 1080±5℃, respectively. At the same time, ammonia gas is injected onto the wire rope from the ammonia decomposition furnace. After annealing, the wire rope is cooled with cooling water. S5: First water tank drawing: Using a wire drawing machine, the annealed steel wire rope is drawn to a thickness of 0.55±0.01mm through twelve drawing passes. The drawing process is as follows: 1.56-1.42-1.29- 1.17-1.6-0.96-0.87-0.79-0.72-0.66-0.60-0.55, during the drawing process, a lubricant with a temperature of 40±5℃, a concentration of 3.0%-4.0%, and a pH of 8.0-8.5 is applied to the wire rope; S6: Small annealing. The steel wire rope after being drawn from the water tank passes through the three annealing zones of the small annealing furnace at a speed of 15.0 m / min. The temperatures of the three annealing zones are 1050±30℃, 1060±10℃, and 1060±20℃, respectively. At the same time, the ammonia decomposition furnace sprays ammonia gas onto the steel wire rope. After annealing, the steel wire rope is cooled down with cooling water. S7: Second water tank drawing: Using a wire drawing machine, the cooled 0.55±0.01mm steel wire rope is drawn to 0.162±0.01mm as the edge wire of the synchronous rotating steel wire rope, and 0.182±0.01mm as the center wire of the synchronous rotating steel wire rope. During the drawing process, a lubricant with a temperature of 40±5℃, a concentration of 4.0%-5.0%, and a pH of 8.5-9.0 is applied to the steel wire rope. S8: Twisting step, using a double twisting machine to twist the six edge wires around the center wire in the S direction to form a synchronous rotating steel wire rope with a 1×7 structure and a diameter of 0.49-0.51mm; S9: Fine finishing, the twisted synchronous rotating steel wire rope is cooled with cooling water at a temperature of 26℃, cleaned with 1.6-2.0 mol of hydrogen and a solution with a pH of 9-11, and cleaned with 3.5MHz ultrasonic waves.

2. The method for producing synchronously rotating steel wire rope as described in claim 1, characterized in that: The chemical composition of the stainless steel wire in step S1 is as follows: C: 0.034%, Si: 0.31%, Mn: 0.71%, P: 0.131%, S: 0.002%, Cr: 18.03%, Ni: 8.02%, Cu: 0.3%, Mo: 0.02%, N: 0.05%.

3. The method for producing synchronously rotating steel wire rope as described in claim 1, characterized in that: In step S7, the loop diameter is ≥100mm, the warp distance is ≤2mm, and the single filament knotting rate is ≥55%.

4. The method for producing synchronously rotating steel wire rope as described in claim 1, characterized in that: In step S8, the twisting machine speed is 2500 rpm, the pressing die is 0.55 mm, and the twist pitch is 4.0 mm.

5. The method for producing synchronously rotating steel wire rope as described in claim 1, characterized in that: In steps S2 and S3, the steel wool used for cleaning in the cleaning tank and pickling tank must completely cover the steel wire rope, and the steel wool must be fixed with the weight provided by the equipment.

6. The method for producing synchronously rotating steel wire rope as described in claim 1, characterized in that: In step S4, the wire strength is 570-830 MPa and the elongation is ≥30%. In step S5, the single wire strength is 1670-1930 MPa. In step S6, the wire strength is 600-870 MPa and the elongation is ≥20%. In step S7, the single wire strength is 1730-2000 MPa.

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