Galvanizing treatment process for steel wire rope production and processing

Abstract

The invention discloses a galvanization treatment process for steel wire rope production and processing. The galvanization treatment process comprises the following steps: preparing a steel wire rope needing galvanization processing; preparing a zinc sulfate salt solution; the steel wire rope subjected to surface treatment is subjected to annealing treatment; electroplating is started, the prepared steel wire rope is put into an electroplating pool, and the steel wire rope is connected with a cathode; the method comprises the following steps: taking up a wire after electroplating is completed, washing with hot water in the take-up process, then drawing a steel wire rope, controlling the concentration and current density of an electroplating solution in the electroplating process, optimizing the process, controlling the quality of all electro-galvanized layers to be 80-90g / m < 2 > when batch production is carried out on electro-galvanized steel wires with the diameter of 0.8 mm, and ensuring that the quality of the zinc layers is small in scattering difference. And not only is the quality of the zinc layer surface of the raw material steel wire for electrogalvanizing the rope effectively controlled, but also unnecessary waste is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The invention specifically relates to the technical field of steel wire rope processing technology, in particular to a galvanizing treatment process for steel wire rope production and processing. Background Art

[0002] Wire rope is a spiral bundle of steel wires twisted together according to certain rules with steel wires that meet the requirements of mechanical properties and geometric dimensions. Wire rope consists of steel wire, rope core and grease. In order to improve the corrosion resistance of wire rope during use, it is usually necessary to galvanize the wire rope before twisting.

[0003] At present, there are usually two types of galvanizing processes for steel wire ropes, one is hot-dip galvanizing and the other is electroplating. Compared with hot-dip galvanizing, electroplating is more suitable for steel wire ropes that require high-strength use. However, in the existing electroplating process, due to differences in the concentration of the plating solution and the current density, it is easy to cause burrs or low density in the zinc layer on the surface of the steel wire during the electroplating process, affecting the processing effect. Summary of the invention

[0004] The object of the present invention is to provide a galvanizing process for the production and processing of steel wire ropes, so as to solve the problem that in the existing electroplating process proposed in the above-mentioned background technology, due to the differences in the concentration and current density of the electroplating solution during the processing, the zinc layer on the surface of the steel wire may have burrs or a low density during the electroplating process, thereby affecting the processing effect.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A galvanizing process for producing and processing steel wire ropes comprises the following steps:

[0007] Step 1: Prepare the steel wire rope to be galvanized;

[0008] Step 2: preparing a zinc sulfate solution;

[0009] Step 3: Annealing the steel wire rope after surface treatment;

[0010] Step 4: Start electroplating, put the prepared steel wire rope into the electroplating tank, and connect the steel wire rope to the cathode;

[0011] Step 5: After the electroplating is completed, the wire is reeled in, washed with hot water during the reeling process, and then the wire rope is pulled.

[0012] Preferably, the step 1: degreasing and pickling the surface of the steel wire rope to be galvanized, the quality of the pickling directly affects the bonding strength between the coating and the substrate, and ensures that the surface of the steel wire rope has good cleanliness after the treatment.

[0013] Preferably, in the step 2: during the electrogalvanizing production process, the key factors affecting the quality of galvanizing are the cleanliness of the surface of the steel wire rope, the mass concentration of the electroplating solution, the pH value control, and the size of the single-filament current, so that the mass concentration of zinc sulfate is 400-600 g / L, and the pH value of the electroplating solution is 2-4. The mass concentration of the electroplating solution directly determines the replenishment rate of ions in the solution after ion migration, eliminating concentration polarization.

[0014] Preferably, the step 3: annealing the steel wire rope before electroplating can reduce the overall hardness of the steel wire rope, making it easier to draw the steel wire rope after electroplating.

[0015] Preferably, in step 4: during the electroplating process, the pH value of the plating solution needs to be strictly controlled. The pH value of the plating solution directly affects the quality of the steel wire coating. For example, when the pH value is greater than 3, the steel wire coating has burrs caused by fine dendrites and the surface is not smooth. At the same time, the current density needs to be strictly controlled. The greater the current density, the larger the zinc layer grain deposition, and the less dense the corresponding zinc layer. Conversely, the denser the ion deposition, the better the zinc layer quality.

[0016] Preferably, practice has shown that the process parameters are optimized as follows: when the current density is 15-20A / dm2, the mass concentration of the zinc sulfate solution is 500g / L, and the pH value is 2.4-3, the zinc layer mass per unit area can reach about 80g / m2 while ensuring that the surface zinc layer is dense and smooth. 2 .

[0017] Preferably, the step 5: during the drawing process, it is necessary to strictly follow the multi-pass and small compression rate drawing, the total compression rate is 96.5%, reduce the scraping of the zinc layer, the drawing die is a combination of a tungsten steel die and a polycrystalline die, the angle of the working cone of the drawing die is 12°~16°, and the length of the sizing belt is 0.15 of the diameter of the steel wire to ensure that the deformation of the zinc layer is basically synchronized with the steel wire matrix. At the same time, during the drawing process, the drawing die is cooled by spraying to ensure the quality of the steel wire. During the drawing process, it is necessary to control the wire taking-up speed at 10~11m / s, the wire taking-up tension at 8~10N, the lubricant mass fraction at 3.5~4.5%, the lubricant pH value at 7~8, and the lubricant temperature at 30~40℃.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In the present invention,

[0020] (1) By controlling the concentration and current density of the electroplating solution during the electroplating process: After process optimization, when batch-producing electrogalvanized steel wire with a diameter of 0.8 mm, the quality of the electrogalvanized zinc layer is all controlled at 80-90 g / m2, and the quality dispersion of the zinc layer is very small.

[0021] (2) After the steel wire rope is drawn, the zinc layer on its surface is monitored. The results show that the average zinc layer mass is 14.5g / m2, the zinc layer loss is less than 5%, and the tensile strength of the steel wire is 2300-2500MPa. This not only effectively controls the zinc layer mass of the raw material steel wire for electrogalvanized rope making, but also reduces unnecessary waste and reduces production costs. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] In an embodiment of the present invention, a galvanizing process for producing and processing a steel wire rope comprises the following steps:

[0024] Step 1: Prepare the steel wire rope to be galvanized;

[0025] Step 2: preparing a zinc sulfate solution;

[0026] Step 3: Annealing the steel wire rope after surface treatment;

[0027] Step 4: Start electroplating, put the prepared steel wire rope into the electroplating tank, and connect the steel wire rope to the cathode;

[0028] Step 5: After the electroplating is completed, the wire is reeled in, washed with hot water during the reeling process, and then the wire rope is pulled.

[0029] The step 1 is to degrease and pickle the surface of the steel wire rope to be galvanized. The quality of pickling directly affects the bonding strength between the coating and the substrate, and ensures that the surface of the steel wire rope has good cleanliness after the treatment.

[0030] The step 2: During the electrogalvanizing production process, the key factors affecting the quality of galvanizing are the cleanliness of the surface of the steel wire rope, the mass concentration of the electroplating solution, the pH value control, and the size of the single-wire current, so that the mass concentration of zinc sulfate is 400-600 g / L, and the pH value of the electroplating solution is 2-4. The mass concentration of the electroplating solution directly determines the replenishment rate of ions in the solution after ion migration, eliminating concentration polarization.

[0031] The step 3: annealing the steel wire rope before electroplating can reduce the overall hardness of the steel wire rope, making it easier to draw the steel wire rope after electroplating.

[0032] The step 4: During the electroplating process, the pH value of the plating solution needs to be strictly controlled. The pH value of the plating solution directly affects the quality of the steel wire coating. For example, when the pH value is greater than 3, the steel wire coating has burrs caused by fine dendrites and the surface is not smooth. At the same time, the current density needs to be strictly controlled. The greater the current density, the larger the zinc layer grain deposition, and the less dense the corresponding zinc layer. Conversely, the denser the ion deposition, the better the zinc layer quality.

[0033] Practice has proved that when the process parameters are optimized as follows: current density of 15-20A / dm2, mass concentration of zinc sulfate solution of 500g / L, and pH value of 2.4-3, the zinc surface mass per unit area can reach about 80g / m2 while ensuring that the surface zinc layer is dense and smooth.

[0034] The step 5 described: during the drawing process, it is necessary to strictly follow the multi-pass and small compression rate drawing, the total compression rate is 96.5%, reduce the scraping of the zinc layer, the drawing die is a combination of a tungsten steel die and a polycrystalline die, the angle of the working cone of the wire drawing die is 12° to 16°, and the length of the sizing belt is 0.15 of the wire diameter to ensure that the deformation of the zinc layer is basically synchronized with the steel wire matrix. At the same time, during the drawing process, the wire drawing die is cooled by spraying to ensure the quality of the steel wire. During the drawing process, it is necessary to control the wire drawing speed of 10 to 11 m / s, the wire drawing tension of 8 to 10 N, the lubricant mass fraction of 3.5 to 4.5%, the lubricant pH value of 7 to 8, and the lubricant temperature of 30 to 40°C.

[0035] In the present invention, the concentration and current density of the electroplating solution are controlled during the electroplating process: after process optimization, when batch-producing electrogalvanized steel wires with a diameter of 0.8 mm, the quality of the electrogalvanized zinc layer is all controlled at 80-90 g / m2, and the quality dispersion of the zinc layer is very small. In the subsequent steel wire rope after drawing, the zinc layer on its surface is monitored, and the results show that the average zinc layer quality is 14.5 g / m2, the zinc layer loss is less than 5%, and the tensile strength of the steel wire is 2300-2500 MPa. This not only effectively controls the zinc layer quality of the raw material steel wire for electrogalvanized rope making, but also reduces unnecessary waste and reduces production costs.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A galvanizing process for the production and processing of steel wire ropes, characterized in that: The following steps are involved: Step 1: Prepare the steel wire rope to be galvanized; Step 2: preparing a zinc sulfate solution; Step 3: Annealing the steel wire rope after surface treatment; Step 4: Start electroplating, put the prepared steel wire rope into the electroplating tank, and connect the steel wire rope to the cathode; Step 5: After the electroplating is completed, the wire is reeled in, washed with hot water during the reeling process, and then the wire rope is pulled.

2. The galvanizing process for steel wire rope production and processing according to claim 1, characterized in that: The step 1 is to degrease and pickle the surface of the steel wire rope to be galvanized. The quality of pickling directly affects the bonding strength between the coating and the substrate, and ensures that the surface of the steel wire rope has good cleanliness after the treatment.

3. The galvanizing process for steel wire rope production and processing according to claim 1, characterized in that: The step 2: During the electrogalvanizing production process, the key factors affecting the quality of galvanizing are the cleanliness of the surface of the steel wire rope, the mass concentration of the electroplating solution, the pH value control, and the size of the single-wire current, so that the mass concentration of zinc sulfate is 400-600 g / L, and the pH value of the electroplating solution is 2-4. The mass concentration of the electroplating solution directly determines the replenishment rate of ions in the solution after ion migration, eliminating concentration polarization.

4. The galvanizing process for producing and processing steel wire ropes according to claim 1, characterized in that: The step 3: annealing the steel wire rope before electroplating can reduce the overall hardness of the steel wire rope, making it easier to draw the steel wire rope after electroplating.

5. The galvanizing process for steel wire rope production and processing according to claim 1, characterized in that: The step 4: During the electroplating process, the pH value of the plating solution needs to be strictly controlled. The pH value of the plating solution directly affects the quality of the steel wire coating. For example, when the pH value is greater than 3, the steel wire coating has burrs caused by fine dendrites and the surface is not smooth. At the same time, the current density needs to be strictly controlled. The greater the current density, the larger the zinc layer grain deposition, and the less dense the corresponding zinc layer. Conversely, the denser the ion deposition, the better the zinc layer quality.

6. The galvanizing process for producing and processing steel wire ropes according to claim 4, characterized in that: Practice has shown that when the process parameters are optimized as follows: current density of 15-20A / dm2, zinc sulfate solution concentration of 500g / L, pH value of 2.4-3, the zinc layer mass per unit area can reach about 80g / m2 while ensuring the surface zinc layer is dense and smooth. 2 .

7. The galvanizing process for producing and processing steel wire ropes according to claim 1, characterized in that: The step 5 described: during the drawing process, it is necessary to strictly follow the multi-pass and small compression rate drawing, the total compression rate is 96.5%, reduce the scraping of the zinc layer, the drawing die is a combination of a tungsten steel die and a polycrystalline die, the angle of the working cone of the wire drawing die is 12° to 16°, and the length of the sizing belt is 0.15 of the wire diameter to ensure that the deformation of the zinc layer is basically synchronized with the steel wire matrix. At the same time, during the drawing process, the wire drawing die is cooled by spraying to ensure the quality of the steel wire. During the drawing process, it is necessary to control the wire drawing speed of 10 to 11 m / s, the wire drawing tension of 8 to 10 N, the lubricant mass fraction of 3.5 to 4.5%, the lubricant pH value of 7 to 8, and the lubricant temperature of 30 to 40°C.