Roller brush support mirror surface cold-drawn wire and preparation method thereof

Abstract

The invention provides a roller brush bracket mirror surface cold-drawn wire which comprises the following raw materials in percentage by weight: 0.15 to 0.25 percent of carbon, 0.40 to 0.60 percent of manganese, 0.15 to 0.35 percent of silicon, 0.05 to 0.15 percent of chromium, 0.02 to 0.05 percent of copper and the balance of iron. The carbon element is used for improving the strength and hardness of the mirror surface cold-drawn wire; the manganese element is used for improving the toughness and ductility of the mirror surface cold-drawn wire; the silicon element is used for enhancing the oxidation resistance and wear resistance of the mirror surface cold-drawn wire; and by adding the chromium element and the copper element, the corrosion resistance of the mirror surface cold-drawn wire can be remarkably improved. The mirror surface cold-drawn wire is composed of carbon, manganese, silicon, chromium, copper and iron according to specific components, then a material with surface smoothness and excellent corrosion resistance and strength is formed through the cold drawing technology, then the roller brush support is manufactured through the mirror surface cold-drawn wire, the attractiveness of the support can be improved, the service life of the support can be prolonged, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of roller brush technology, and in particular to a roller brush holder with mirror-finished cold-drawn wire and its preparation method. Background Technology

[0002] Roller brushes are common painting tools widely used in construction, decoration, and other fields. As the core component of the roller brush, the roller brush holder needs to possess sufficient strength and corrosion resistance to ensure its service life. Currently, most roller brush holders on the market are made of ordinary iron wire or stainless steel wire, resulting in low surface finish, susceptibility to rust, and poor aesthetics.

[0003] Cold-drawn wire is a type of metal wire produced through a cold-drawing process, possessing high strength and precision. Mirror-finish cold-drawn wire undergoes a special surface treatment after cold drawing, giving it a mirror-like finish. Applying mirror-finish cold-drawn wire to roller brush holders can effectively improve the holder's performance and appearance. However, existing cold-drawn wires still have shortcomings in composition design and manufacturing processes, making it difficult to meet the special material requirements of roller brush holders. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the existing technology. The present invention proposes a mirror-finished cold-drawn wire for a roller brush holder and its preparation method.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A mirror-finished cold-drawn wire for a roller brush holder, by weight percentage, comprises: 0.15-0.25% carbon, 0.40-0.60% manganese, 0.15-0.35% silicon, 0.05-0.15% chromium, 0.02-0.05% copper, with the balance being iron; carbon is used to improve the strength and hardness of the mirror-finished cold-drawn wire; manganese is used to improve the toughness and ductility of the mirror-finished cold-drawn wire; silicon is used to enhance the oxidation resistance and wear resistance of the mirror-finished cold-drawn wire; and the addition of chromium and copper can significantly improve the corrosion resistance of the mirror-finished cold-drawn wire.

[0006] Preferably, the mirror-finished cold-drawn wire has a carbon content of 0.18-0.22%, a manganese content of 0.45-0.55%, and a silicon content of 0.20-0.30% by weight, which results in better overall performance of the mirror-finished cold-drawn wire.

[0007] Preferably, the surface roughness Ra of the mirror-finished cold-drawn wire is ≤0.2μm, which has an excellent mirror effect, high aesthetic appeal, and is not prone to paint residue adhesion, making it easy to clean.

[0008] Preferably, the mirror-finished cold-drawn wire has a tensile strength ≥550MPa and an elongation ≥20%, which meets the strength requirements of the roller brush holder during use, while also having good toughness and being not easily broken.

[0009] A method for preparing mirror-finished cold-drawn wire for a roller brush holder specifically includes the following steps: Step S1. Raw material smelting Raw material preparation: Based on the precise chemical composition requirements, prepare the following raw materials: carbon content 0.15-0.25%, manganese content 0.40-0.60%, silicon content 0.15-0.35%, chromium content 0.05-0.15%, copper content 0.02-0.05%, with the remainder being iron; the selection and proportioning of these elements are used to optimize the strength, hardness, toughness, ductility, oxidation resistance, wear resistance, and corrosion resistance of the steel. Melting process: Add the above raw materials to the electric arc furnace in proportion, and melt the raw materials rapidly through the high temperature of the electric arc; control the melting temperature between 1550-1650℃ to ensure that all raw materials are fully melted and uniformly mixed; hold at this temperature for 2-3 hours to further homogenize the chemical composition of the molten steel and reduce segregation. Step S2. Casting and Molding Casting preparation: After the molten steel reaches the ideal chemical composition and temperature, prepare the casting mold; the internal forming cavity of the mold is circular; Casting process: Slowly pour molten steel into the mold to avoid the formation of air bubbles and inclusions; after casting, allow the billet to cool naturally to room temperature in the mold to obtain a dense billet, and discard billets with external pores and impurities, selecting high-quality billets. Step S3. Preprocessing Annealing treatment: The selected round billet is annealed to eliminate internal stress and structural defects generated during the casting process; the annealing temperature is set at 850-900℃ and held at this temperature for 4-6 hours to soften the microstructure of the steel and improve its plasticity for subsequent processing. Cooling process: After annealing, the billet is cooled in the furnace to below 400℃ to avoid cracks and deformation caused by rapid cooling; after being taken out of the furnace, the billet is allowed to cool naturally to room temperature in the air. Step S4. Cold drawing process Cold drawing preparation: The pretreated round blank is stretched using a multi-pass cold drawing process; before cold drawing, a cemented carbide mold and a special lubricant are required; the cemented carbide mold has high hardness and wear resistance, which can ensure the dimensional accuracy and surface quality of the wire during the cold drawing process; Cold drawing process: The cold drawing process is carried out at least 5 times, and the deformation amount of each cold drawing is controlled at 10-15%; through multiple cold drawing and gradual deformation, the diameter of the wire is gradually reduced, while its strength and toughness are improved; during the cold drawing process, a special lubricant needs to be applied continuously to ensure the smooth progress of the cold drawing. Step S5. Mirror Finish Electropolishing preparation: The cold-drawn wire is subjected to electropolishing treatment to further improve its surface quality and gloss; then the electrolyte is prepared. Electrolytic polishing process: Immerse the wire in the electrolyte, control the electrolyte temperature at 50-60℃ and the current density at 10-15A / dm²; treat under these conditions for 15-25 minutes to cause electrochemical dissolution of the wire surface, forming a smooth, mirror-like surface; during the electrolytic polishing process, the electrolyte needs to be stirred continuously to ensure the uniformity of the polishing effect; Post-processing: After electropolishing, the filament is removed from the electrolyte, rinsed with clean water and dried; at this point, a cold-drawn filament with a mirror finish is obtained, which is used to manufacture roller brush holders.

[0010] Preferably, the special lubricant in step S4 is composed of the following components in parts by weight: 60-70 parts mineral oil, 5-10 parts polytetrafluoroethylene micro powder, 3-5 parts molybdenum disulfide, 8-12 parts fatty acid soap, and 2-4 parts rust inhibitor. These components work together to provide good lubrication performance, extreme pressure performance and rust prevention performance, and reduce friction and wear during the cold drawing process.

[0011] Preferably, the electrolyte in step S5 consists of the following components by weight percentage: 60-70% phosphoric acid, 10-15% sulfuric acid, 2-5% chromic anhydride, and 15-20% water. These components work together to provide good polishing results and corrosion control.

[0012] A roller brush holder, wherein a portion of the holder's structure is made of the aforementioned mirror-finished cold-drawn wire.

[0013] Compared with the prior art, the beneficial effects of the present invention include: The mirror-finish cold-drawn wire of the present invention is composed of carbon, manganese, silicon, chromium, copper and iron in a specific composition, and then formed into a material with excellent surface smoothness, corrosion resistance and strength through a cold drawing process. The mirror-finish cold-drawn wire is then used to make roller brush holders, which can improve the aesthetics and service life of the holders and reduce production costs. Attached Figure Description

[0014] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1This is a flowchart illustrating the steps of a method for preparing mirror-finished cold-drawn wire for a roller brush holder, as proposed in this invention. Detailed Implementation

[0015] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0016] Example 1 According to one embodiment of the present invention, Figure 1 As shown.

[0017] A method for preparing mirror-finished cold-drawn wire for a roller brush holder specifically includes the following steps: Step S1. Raw material smelting Raw material preparation: Based on the precise chemical composition requirements, prepare the following raw materials: carbon (C) content of 0.15%, manganese (Mn) content of 0.40%, silicon (Si) content of 0.15%, chromium (Cr) content of 0.05%, copper (Cu) content of 0.02%, and the remainder is iron (Fe); the selection and proportion of these elements are used to optimize the strength, hardness, toughness, ductility, oxidation resistance, wear resistance and corrosion resistance of the steel.

[0018] Melting process: The above raw materials are added to the electric arc furnace in proportion, and the high temperature of the electric arc rapidly melts the raw materials. The melting temperature is controlled between 1550℃ to ensure that all raw materials are fully melted and uniformly mixed. This temperature is maintained for 2 hours to further homogenize the chemical composition of the molten steel and reduce segregation.

[0019] Step S2. Casting and Molding Casting preparation: After the molten steel reaches the ideal chemical composition and temperature, prepare the casting mold. The internal forming cavity of the mold is circular.

[0020] Casting process: Slowly pour molten steel into the mold to avoid the formation of air bubbles and inclusions. After casting, allow the billet to cool naturally to room temperature in the mold to obtain a dense billet. Remove billets with external pores and impurities, and select high-quality billets.

[0021] Step S3. Preprocessing Annealing: The selected round billet is annealed to eliminate internal stress and structural defects generated during casting. The annealing temperature is set at 850℃, and the billet is held at this temperature for 4 hours to soften the microstructure of the steel and improve its plasticity for subsequent processing.

[0022] Cooling process: After annealing, the billet is cooled in the furnace to below 400℃ to avoid cracks and deformation caused by rapid cooling. After being removed from the furnace, the billet is allowed to cool naturally to room temperature in the air.

[0023] Step S4. Cold drawing process Cold drawing preparation: The pretreated round billet is stretched using a multi-pass cold drawing process. Before cold drawing, cemented carbide dies and special lubricants are required. The cemented carbide dies have high hardness and wear resistance, which can ensure the dimensional accuracy and surface quality of the wire during the cold drawing process.

[0024] Lubricant Formulation: The special lubricant consists of the following components by weight: 60 parts mineral oil, 5 parts polytetrafluoroethylene micro powder, 3 parts molybdenum disulfide, 8 parts fatty acid soap, and 2 parts rust inhibitor. These components work together to provide excellent lubrication, extreme pressure, and rust prevention properties, reducing friction and wear during cold drawing.

[0025] Cold drawing process: The cold drawing process is performed at least 5 times, with the deformation amount controlled at 10% each time. Through multiple cold drawing and gradual deformation, the diameter of the wire is gradually reduced, while its strength and toughness are improved. During the cold drawing process, a special lubricant must be continuously applied to ensure the smooth progress of the cold drawing.

[0026] Step S5. Mirror Finish Electropolishing Preparation: The cold-drawn wire undergoes electropolishing to further improve its surface quality and gloss. An electrolyte is prepared, consisting of the following components by weight percentage: 60% phosphoric acid, 15% sulfuric acid, 5% chromic anhydride, and 20% water. These components work together to provide excellent polishing results and corrosion control.

[0027] Electropolishing process: The wire is immersed in an electrolyte solution, with the electrolyte temperature controlled at 50℃ and the current density at 10A / dm². Under these conditions, it is treated for 15 minutes to allow electrochemical dissolution of the wire surface, forming a smooth, mirror-like surface. During electropolishing, the electrolyte solution must be continuously stirred to ensure uniform polishing results.

[0028] Post-processing: After electropolishing, the filament is removed from the electrolyte, rinsed with clean water, and dried. At this point, a cold-drawn filament with a mirror finish is obtained, which is used to manufacture roller brush holders.

[0029] Tests showed that the surface roughness Ra of the mirror-finished cold-drawn wire was 0.18 μm, the tensile strength was 560 MPa, the elongation was 24%, and it exhibited excellent corrosion resistance.

[0030] Example 2 According to one embodiment of the present invention, Figure 1 As shown.

[0031] A method for preparing mirror-finished cold-drawn wire for a roller brush holder specifically includes the following steps: Step S1. Raw material smelting Raw material preparation: Based on the precise chemical composition requirements, prepare the following raw materials: carbon (C) content of 0.20%, manganese (Mn) content of 0.5%, silicon (Si) content of 0.25%, chromium (Cr) content of 0.10%, copper (Cu) content of 0.03%, and the remainder is iron (Fe); the selection and proportion of these elements are used to optimize the strength, hardness, toughness, ductility, oxidation resistance, wear resistance and corrosion resistance of the steel.

[0032] Melting process: The above raw materials are added to the electric arc furnace in proportion, and the high temperature of the electric arc rapidly melts the raw materials. The melting temperature is controlled at 1600℃ to ensure that all raw materials are fully melted and uniformly mixed. This temperature is maintained for 2.5 hours to further homogenize the chemical composition of the molten steel and reduce segregation.

[0033] Step S2. Casting and Molding Casting preparation: After the molten steel reaches the ideal chemical composition and temperature, prepare the casting mold. The internal forming cavity of the mold is circular.

[0034] Casting process: Slowly pour molten steel into the mold to avoid the formation of air bubbles and inclusions. After casting, allow the billet to cool naturally to room temperature in the mold to obtain a dense billet. Remove billets with external pores and impurities, and select high-quality billets.

[0035] Step S3. Preprocessing Annealing: The selected round billet is annealed to eliminate internal stress and structural defects generated during casting. The annealing temperature is set at 880℃ and held at this temperature for 5 hours to soften the microstructure of the steel and improve its plasticity for subsequent processing.

[0036] Cooling process: After annealing, the billet is cooled in the furnace to below 400℃ to avoid cracks and deformation caused by rapid cooling. After being removed from the furnace, the billet is allowed to cool naturally to room temperature in the air.

[0037] Step S4. Cold drawing process Cold drawing preparation: The pretreated round billet is stretched using a multi-pass cold drawing process. Before cold drawing, cemented carbide dies and special lubricants are required. The cemented carbide dies have high hardness and wear resistance, which can ensure the dimensional accuracy and surface quality of the wire during the cold drawing process.

[0038] Lubricant Formulation: The special lubricant consists of the following components by weight: 65 parts mineral oil, 8 parts polytetrafluoroethylene micro powder, 4 parts molybdenum disulfide, 10 parts fatty acid soap, and 3 parts rust inhibitor. These components work together to provide excellent lubrication, extreme pressure, and rust prevention properties, reducing friction and wear during cold drawing.

[0039] Cold drawing process: The cold drawing process is performed at least 5 times, with the deformation amount controlled at 12% each time. Through multiple cold drawing and gradual deformation, the diameter of the wire is gradually reduced, while its strength and toughness are improved. During the cold drawing process, a special lubricant must be continuously applied to ensure the smooth progress of the cold drawing.

[0040] Step S5. Mirror Finish Electropolishing Preparation: The cold-drawn wire undergoes electropolishing to further improve its surface quality and gloss. An electrolyte is prepared, consisting of the following components by weight percentage: 65% phosphoric acid, 12% sulfuric acid, 3% chromic anhydride, and 20% water. These components work together to provide excellent polishing results and corrosion control.

[0041] Electropolishing process: The wire is immersed in an electrolyte solution, with the electrolyte temperature controlled at 55℃ and the current density at 12A / dm². Under these conditions, it is treated for 20 minutes to allow electrochemical dissolution of the wire surface, forming a smooth, mirror-like surface. During electropolishing, the electrolyte solution must be continuously stirred to ensure uniform polishing results.

[0042] Post-processing: After electropolishing, the filament is removed from the electrolyte, rinsed with clean water, and dried. At this point, a cold-drawn filament with a mirror finish is obtained, which is used to manufacture roller brush holders.

[0043] Tests showed that the surface roughness Ra of the mirror-finished cold-drawn wire was 0.15μm, the tensile strength was 580MPa, the elongation was 22%, and it exhibited excellent corrosion resistance.

[0044] Example 3 According to one embodiment of the present invention, Figure 1 As shown.

[0045] A method for preparing mirror-finished cold-drawn wire for a roller brush holder specifically includes the following steps: Step S1. Raw material smelting Raw material preparation: Based on the precise chemical composition requirements, prepare the following raw materials: carbon (C) content of 0.25%, manganese (Mn) content of 0.60%, silicon (Si) content of 0.35%, chromium (Cr) content of 0.15%, copper (Cu) content of 0.05%, and the remainder is iron (Fe); the selection and proportion of these elements are used to optimize the strength, hardness, toughness, ductility, oxidation resistance, wear resistance and corrosion resistance of the steel.

[0046] Melting process: The above raw materials are added to the electric arc furnace in proportion, and the high temperature of the electric arc rapidly melts the raw materials. The melting temperature is controlled at 1650℃ to ensure that all raw materials are fully melted and uniformly mixed. This temperature is maintained for 3 hours to further homogenize the chemical composition of the molten steel and reduce segregation.

[0047] Step S2. Casting and Molding Casting preparation: After the molten steel reaches the ideal chemical composition and temperature, prepare the casting mold. The internal forming cavity of the mold is circular.

[0048] Casting process: Slowly pour molten steel into the mold to avoid the formation of air bubbles and inclusions. After casting, allow the billet to cool naturally to room temperature in the mold to obtain a dense billet. Remove billets with external pores and impurities, and select high-quality billets.

[0049] Step S3. Preprocessing Annealing: The selected round billet is annealed to eliminate internal stress and structural defects generated during casting. The annealing temperature is set at 900℃ and held at this temperature for 6 hours to soften the microstructure of the steel and improve its plasticity for subsequent processing.

[0050] Cooling process: After annealing, the billet is cooled in the furnace to below 400℃ to avoid cracks and deformation caused by rapid cooling. After being removed from the furnace, the billet is allowed to cool naturally to room temperature in the air.

[0051] Step S4. Cold drawing process Cold drawing preparation: The pretreated round billet is stretched using a multi-pass cold drawing process. Before cold drawing, cemented carbide dies and special lubricants are required. The cemented carbide dies have high hardness and wear resistance, which can ensure the dimensional accuracy and surface quality of the wire during the cold drawing process.

[0052] Lubricant Formulation: The special lubricant consists of the following components by weight: 70 parts mineral oil, 10 parts polytetrafluoroethylene micro powder, 5 parts molybdenum disulfide, 12 parts fatty acid soap, and 4 parts rust inhibitor. These components work together to provide excellent lubrication, extreme pressure, and rust prevention properties, reducing friction and wear during cold drawing.

[0053] Cold drawing process: The cold drawing process is performed at least 5 times, with the deformation amount controlled at 15% each time. Through multiple cold drawing and gradual deformation, the diameter of the wire is gradually reduced, while its strength and toughness are improved. During the cold drawing process, a special lubricant must be continuously applied to ensure the smooth progress of the cold drawing.

[0054] Step S5. Mirror Finish Electropolishing Preparation: The cold-drawn wire undergoes electropolishing to further improve its surface quality and gloss. An electrolyte is prepared, consisting of the following components by weight percentage: 70% phosphoric acid, 13% sulfuric acid, 2% chromic anhydride, and 15% water. These components work together to provide excellent polishing results and corrosion control.

[0055] Electropolishing process: The wire is immersed in an electrolyte solution, with the electrolyte temperature controlled at 60℃ and the current density at 15A / dm². Under these conditions, it is treated for 25 minutes to allow electrochemical dissolution of the wire surface, forming a smooth, mirror-like surface. During electropolishing, the electrolyte solution must be continuously stirred to ensure uniform polishing results.

[0056] Post-processing: After electropolishing, the filament is removed from the electrolyte, rinsed with clean water, and dried. At this point, a cold-drawn filament with a mirror finish is obtained, which is used to manufacture roller brush holders.

[0057] Tests showed that the surface roughness Ra of the mirror-finished cold-drawn wire was 0.13 μm, the tensile strength was 600 MPa, the elongation was 17%, and it exhibited excellent corrosion resistance.

[0058] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A roller brush holder with mirror-finished cold-drawn wire, characterized in that, By weight percentage, the raw material composition of mirror-finish cold-drawn wire includes: 0.15-0.25% carbon, 0.40-0.60% manganese, 0.15-0.35% silicon, 0.05-0.15% chromium, 0.02-0.05% copper, with the balance being iron. Carbon is used to improve the strength and hardness of mirror-finish cold-drawn wire; manganese is used to improve the toughness and ductility of mirror-finish cold-drawn wire; silicon is used to enhance the oxidation resistance and wear resistance of mirror-finish cold-drawn wire; and the addition of chromium and copper can significantly improve the corrosion resistance of mirror-finish cold-drawn wire.

2. The roller brush holder with mirror-finished cold-drawn wire according to claim 1, characterized in that, The mirror-finished cold-drawn wire, by weight percentage, contains 0.18-0.22% carbon, 0.45-0.55% manganese, and 0.20-0.30% silicon, resulting in superior overall performance.

3. The roller brush holder with mirror-finished cold-drawn wire according to claim 1, characterized in that, The surface roughness Ra of the mirror-finished cold-drawn wire is ≤0.2μm, which has a mirror effect, high aesthetic appeal, and is not easy to adhere to paint residue, making it easy to clean.

4. The roller brush holder with mirror-finished cold-drawn wire according to claim 1, characterized in that, The mirror-finished cold-drawn wire has a tensile strength of ≥550MPa and an elongation of ≥20%, which meets the strength requirements of the roller brush holder during use, while also having good toughness and being not easily broken.

5. A method for preparing mirror-finished cold-drawn wires for a roller brush holder as described in any one of claims 1-4, characterized in that, Includes the following steps: Step S1. Raw material smelting Raw material preparation: Based on the precise chemical composition requirements, prepare the following raw materials: carbon content 0.15-0.25%, manganese content 0.40-0.60%, silicon content 0.15-0.35%, chromium content 0.05-0.15%, copper content 0.02-0.05%, with the remainder being iron; the selection and proportioning of these elements are used to optimize the strength, hardness, toughness, ductility, oxidation resistance, wear resistance, and corrosion resistance of the steel. Melting process: Add the above raw materials to the electric arc furnace in proportion, and melt the raw materials rapidly through the high temperature of the electric arc; control the melting temperature between 1550-1650℃ to ensure that all raw materials are fully melted and uniformly mixed; hold at this temperature for 2-3 hours to further homogenize the chemical composition of the molten steel and reduce segregation. Step S2. Casting and Molding Casting preparation: After the molten steel reaches the ideal chemical composition and temperature, prepare the casting mold; the internal forming cavity of the mold is circular; Casting process: Slowly pour molten steel into the mold to avoid the formation of air bubbles and inclusions; after casting, allow the billet to cool naturally to room temperature in the mold to obtain a dense billet, and discard billets with external pores and impurities, selecting high-quality billets. Step S3. Preprocessing Annealing treatment: The selected round billet is annealed to eliminate internal stress and structural defects generated during the casting process; the annealing temperature is set at 850-900℃ and held at this temperature for 4-6 hours to soften the microstructure of the steel and improve its plasticity for subsequent processing. Cooling process: After annealing, the billet is cooled in the furnace to below 400℃ to avoid cracks and deformation caused by rapid cooling; after being taken out of the furnace, the billet is allowed to cool naturally to room temperature in the air. Step S4. Cold drawing process Cold drawing preparation: The pretreated round billet is stretched using a multi-pass cold drawing process; Before cold drawing, a carbide mold and a special lubricant are required; Carbide molds have high hardness and wear resistance, which can ensure the dimensional accuracy and surface quality of wires during cold drawing. Cold drawing process: The cold drawing process is carried out at least 5 times, and the deformation amount of each cold drawing is controlled at 10-15%; through multiple cold drawing and gradual deformation, the diameter of the wire is gradually reduced, while its strength and toughness are improved; during the cold drawing process, a special lubricant needs to be applied continuously to ensure the smooth progress of the cold drawing. Step S5. Mirror Finish Electropolishing preparation: The cold-drawn wire is subjected to electropolishing treatment to further improve its surface quality and gloss; then the electrolyte is prepared. Electrolytic polishing process: Immerse the wire in the electrolyte, control the electrolyte temperature at 50-60℃ and the current density at 10-15A / dm²; treat under these conditions for 15-25 minutes to cause electrochemical dissolution of the wire surface, forming a smooth, mirror-like surface; during the electrolytic polishing process, the electrolyte needs to be stirred continuously to ensure the uniformity of the polishing effect; Post-processing: After electropolishing, the filament is removed from the electrolyte, rinsed with clean water and dried; at this point, a cold-drawn filament with a mirror finish is obtained, which is used to manufacture roller brush holders.

6. The method for preparing mirror-finished cold-drawn wire of the roller brush holder according to claim 5, characterized in that, The special lubricant in step S4 consists of the following components in parts by weight: 60-70 parts mineral oil, 5-10 parts polytetrafluoroethylene micro powder, 3-5 parts molybdenum disulfide, 8-12 parts fatty acid soap, and 2-4 parts rust inhibitor. These components work together to provide lubrication, extreme pressure and rust prevention properties, and reduce friction and wear during the cold drawing process.

7. The method for preparing mirror-finished cold-drawn wire of the roller brush holder according to claim 5, characterized in that, In step S5, the electrolyte is composed of the following components by weight percentage: 60-70% phosphoric acid, 10-15% sulfuric acid, 2-5% chromium anhydride, and 15-20% water. These components work together to provide good polishing effect and corrosion control.

8. A roller brush holder, characterized in that, The structure of the bracket portion is made of mirror-finished cold-drawn wire as described in any one of claims 1-4.

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