CN113948253A - Preparation method of enameled wire with better physical properties - Google Patents
Preparation method of enameled wire with better physical properties Download PDFInfo
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- CN113948253A CN113948253A CN202111244803.8A CN202111244803A CN113948253A CN 113948253 A CN113948253 A CN 113948253A CN 202111244803 A CN202111244803 A CN 202111244803A CN 113948253 A CN113948253 A CN 113948253A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0026—Apparatus for manufacturing conducting or semi-conducting layers, e.g. deposition of metal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0006—Apparatus or processes specially adapted for manufacturing conductors or cables for reducing the size of conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/065—Insulating conductors with lacquers or enamels
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/16—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying
- H01B13/165—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying by spraying
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/30—Drying; Impregnating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a preparation method of an enameled wire with better physical properties, which takes an industrial copper rod as a raw material, preheats the enameled wire after peeling, and uses composite acid of nitric acid and sulfuric acid to pickle the enameled wire in a preheated state; after pickling, carrying out cold air drying, carrying out surface molybdenum plating, and carrying out primary stretching after a molybdenum plating layer is stable to obtain a copper wire I; cleaning the copper wire I, then annealing, painting the surface after annealing, baking and curing to obtain a copper wire II; and (3) after the copper wire II is stretched to the required diameter, painting the stretched copper wire again, baking and curing the painted copper wire, coating a lubricant on the surface of the cured copper wire, lubricating the surface of the cured copper wire, and rolling to obtain the finished enameled wire. Compared with the conventional enameled wire, the enameled wire treated by the method has better physical strength and has advantages in the aspects of surface abrasion resistance and tensile property.
Description
Technical Field
The invention relates to the technical field of enameled wire processing, in particular to a preparation method of an enameled wire with better physical properties.
Background
The enameled wire is used as a main variety in winding wires and mainly comprises a conductor and an insulating layer, the wire is stretched in a stretching die during preparation, annealing treatment is carried out after stretching is finished, the wire after annealing softening is subjected to multiple times of painting and baking, and then is processed and formed, the quality of the enameled wire is influenced by various factors such as material quality, process conditions, production equipment and environment, wherein the influence of the process conditions on the quality of the enameled wire is most direct and obvious, and the enameled wires produced under different process conditions have different quality characteristics and have better mechanical properties, chemical properties, electrical properties and surface thermal properties.
In addition, in certain fields of application, there may be higher requirements for certain specific properties of the enamelled wire. For example, in a winding set of a direct-current variable-frequency motor, higher requirements are placed on the physical strength and tensile resistance of an enameled wire, because the direct-current variable-frequency compressor is mainly characterized by small volume and small copper wire consumption, the adopted enameled wire is usually thin, the enameled wire produced by the conventional method has poor surface lubricity, physical strength and surface wear resistance, when the enameled wire with thin wire diameter is wound on the winding set of the direct-current compressor, the surface of the enameled wire is easy to generate friction damage due to abrasion on winding equipment, so that the wound compressor coil is subjected to electrical performance test, inter-turn discharge occurs, the compressor is finally burnt due to short circuit, and the winding requirements of the direct-current variable-frequency compressor coil cannot be met; in addition, the enameled wire may be broken due to the winding speed and the winding pretightening force, so that the yield is reduced. Due to the reasons, the enameled wire under the traditional process condition is not easy to produce a product which meets the standard requirements and the customer requirements when the direct-current variable-frequency compressor is prepared; some processes for improving the strength and the quality of the enameled wire by carrying out heat treatment on the enameled wire are also available in the market, but the processes often cause the condition of uneven heat treatment of the enameled wire, so that the conditions of bulging and wire breakage of the formed enameled wire are caused, and the forming quality of the enameled wire is also influenced.
In view of the above, it is necessary to improve the existing process for manufacturing an enameled wire to improve the physical properties of the enameled wire so as to meet the winding requirements of the coil in the dc variable frequency compressor.
Disclosure of Invention
The invention aims to provide a preparation method of an enameled wire with better physical properties, which is used for pretreating a copper rod or a copper wire serving as an enameled wire raw material to improve the processing performance of the enameled wire and can be used for overcoming the defects in the technical background.
The technical problem solved by the invention is realized by adopting the following technical scheme:
a preparation method of an enameled wire with better physical properties is used for treating the enameled wire in a processing process to improve the tensile, compressive and surface scratch resistance of the enameled wire, and comprises the following operation steps:
s1, selecting an industrial copper rod with the purity of more than 99.5 percent and the electric conductivity of more than 98 percent as a raw material, recording the diameter of the raw material industrial copper rod as M, stripping an oxidation layer of the raw material copper rod in a protective gas environment by using a stripping machine, and cleaning the copper rod with the oxidation layer stripped.
S2, preheating the cleaned copper rod to 450-600 ℃ in a protective gas environment, and then sending the copper rod into a pickling tank for pickling without contacting with air, wherein the pickling solution is a composite acid and comprises 3-5 wt% of nitric acid and 5-15 wt% of sulfuric acid, and saturated bisulfate is also added into the pickling solution.
S3, taking out the copper rod after pickling in a pickling solution under the condition of reducing the temperature to room temperature, air-drying the surface of the copper rod by using cold air, plating molybdenum on the surface of the copper rod after air-drying, stretching the copper rod for the first time by using a stretching die after a molybdenum plating layer is stable, stretching the copper rod for the first time to be large, stretching the diameter of the industrial copper rod to N, wherein N is 1/5-1/8M, and obtaining a copper wire I.
S4, cleaning the copper wire I, annealing after cleaning, painting the surface of the annealed copper wire, and baking and curing after painting to obtain a copper wire II.
And S5, carrying out secondary stretching on the copper wire II to the required diameter of the copper wire, ensuring that the required diameter of the copper wire is 0.85-0.95N, then painting the stretched copper wire again, baking and curing the painted copper wire after painting is finished, coating a lubricant on the surface of the cured copper wire, carrying out surface lubrication, and rolling to obtain the finished enameled wire.
Further, when the peeling process is performed in step S1, the peeling thickness of the peeling machine on the surface of the industrial copper bar is 100 to 150 μm.
Further, when cleaning is performed in step S1 and step S4, cleaning is performed in a hot water tank at 70-80 ℃; and in order to improve the cleaning efficiency, a soft hair cylinder brush can be arranged in the length direction of the bottom of the hot water tank, and the copper rod or the surface of the copper wire in the corresponding step is scrubbed through the soft hair cylinder brush so as to remove oil stains, reagents or impurities on the surface of the copper rod or the surface of the copper wire in the corresponding step.
The pickling solution is further limited to be added with one or a combination of an antioxidant, a stabilizer and a corrosion inhibitor, wherein the antioxidant is BHA or BHT, and the addition amount is 50-80 ppm; the stabilizer is persulfate, preferably one of ammonium persulfate, potassium persulfate and sodium persulfate, and the addition amount is 120-150 ppm; the corrosion inhibitor is benzotriazole or diethylenetriamine pentamethylene phosphoric acid; the addition amount is 30-120 ppm.
As a further limitation, the processing mode of the molybdenum plating of the copper rod is electroplating.
Further, when the first stretching is performed in step S3, the stretching process can be continuously performed 2 to 3 times, and the stretching rate during the stretching process is controlled to be 650 to 800 m/min.
Further, when the annealing treatment is performed in step S4, the annealing temperature set in the annealing furnace is 500 to 550 ℃.
Further, when the second stretching is performed in step S5, the stretching process is performed once, and the stretching rate in the stretching process is 900 to 950 m/min.
Has the advantages that: the invention relates to a preparation method of an enameled wire with better physical properties, which optimizes the traditional enameled wire production process, wherein a copper rod is firstly pickled by composite acid in the production process, molybdenum is plated on the surface layer after pickling to form a stable molybdenum film layer, which is beneficial to improving the physical properties of the copper wire, the processability and the surface properties of the copper wire are improved through multiple times of heat treatment and molybdenum film layer formation, the enameled wire with the molybdenum film layer is stretched to generate cracks on the molybdenum film layer so as to improve the surface adhesion property, then painting is respectively carried out in the process of two times of stretching, so that the enameled wire body forms a stable insulating paint layer on the surface of the treated copper wire to ensure the insulating property without influencing the insulating property of the enameled wire body, the effect of improving the enameled linear properties is finally achieved, the enameled wire with small surface friction coefficient, easy winding and processing, The enameled wire has the advantages of wear-resistant, corrosion-resistant, smooth surface layer and long service life.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the technical solutions required to be used in the description of the embodiments or the prior art, and it is obvious that the technical contents in the following description are only some embodiments of the present invention, and for those skilled in the art, other derivative technical solutions can be obtained according to the technical contents without creative efforts, and the technical solutions also belong to the protection scope of the present invention.
The first embodiment is as follows:
in example one, an enamel wire was prepared using an industrial copper rod having a purity of 99.9% and a conductivity of 98.5% as a raw material, and the maximum wire diameter of the enamel wire to be required was defined as 0.22mm, the wire diameter of the copper wire in the enamel wire was 0.2mm, and the diameter of the industrial copper rod as a raw material was 1.5 mm. The preparation method of the enameled wire comprises the following operation steps:
the method comprises the steps of firstly carrying out peeling treatment on a raw material industrial copper rod by using a peeling machine, peeling off the surface with the surface thickness of 100 mu m so as to completely remove the surface skin and an oxidation layer part, and carrying out the whole peeling treatment process under the protection of nitrogen so as to prevent secondary oxidation of the surface caused by high temperature in the peeling process. The industrial copper rod after being peeled is cleaned, the cleaning process is carried out in a hot water tank, the water temperature in the hot water tank is set to be 75 ℃, a soft hair cylinder brush is arranged at the bottom of the hot water tank to scrub the surface of the industrial copper rod passing through the hot water tank, and the cleaning treatment of the hot water tank can be used for cooling the surface of the industrial copper rod after being peeled and can be matched with the soft hair cylinder brush to remove oil stains on the surface of the copper rod or impurities brought in the technical process.
Preheating the cleaned copper rod to 600 ℃ in a protective gas environment, then sending the copper rod into a pickling tank for pickling in a mode of not contacting with air under the protection of protective gas, carrying out pickling treatment in the pickling tank by using composite acid as pickling solution, wherein the composite acid comprises 5 wt% of nitric acid and 12 wt% of sulfuric acid, saturated sodium bisulfate is also added into the pickling solution, the pickling time is 15min, taking out the copper rod after pickling is finished, and air-drying the surface of the copper wire by using cold air at 5 ℃; and taking out the air-dried copper rod, and electroplating molybdenum to obtain the copper rod with the molybdenum-plated surface. In the process, the pickling of the composite acid can enable the surface of the copper rod under the high-temperature condition to be attached with a protective acid substance film at the surface of the copper rod during the cooling process, the surface of the copper rod can have a certain time-long oxidation resistance under the action of the acid substance film, oxides cannot be generated on the surface of the copper rod within a period of time after the pickling and cooling process, the copper rod is taken out to be electroplated under the condition, the surface of the copper rod can form a molybdenum-plated copper rod with a stable form, molybdenum has the advantages of high strength, high melting point, corrosion resistance, grinding resistance and the like, the molybdenum-plated copper rod can be used for modifying the surface of the copper rod, meanwhile, the molybdenum plating layer can also effectively prevent the oxidation of the copper rod, and the electrical property of the molded enameled wire is ensured.
And then stretching the copper rod with the molybdenum plated on the surface layer, wherein the stretching treatment comprises two stages, one stretching stage is large stretching, namely large-proportion stretching, the stretching process stretches the copper rod with the wire diameter of 1.4mm to 1/5-1/8 of the wire diameter, in the embodiment, the stretching process is continuously carried out twice, the stretching speed in the stretching process is 800m/min, the wire diameter of the copper rod is stretched to 0.35mm through a stretching die in the first stretching process in the two continuous stretching processes, and the wire diameter of the copper rod is stretched to 0.22mm through the stretching die in the second stretching process. Due to the characteristics of molybdenum, a paint layer is not easy to form on the surface of the copper rod, the stretching operation according to the proportion can pull out a large number of gaps from the molybdenum-plated layer on the surface of the copper rod, the gaps are convenient for the adhesion of paint, in this case, the copper wire subjected to one-time stretching stage is cleaned by the stretching in the first stage according to the cleaning mode of the raw material industrial copper rod, oil stains and reagents on the surface of the copper wire are cleaned, and then the performance of the copper wire is improved by annealing treatment in an annealing furnace at the temperature of 500 ℃.
The surface of the copper wire after annealing treatment is painted, in the embodiment, the surface of the copper wire is painted with three times of polyester imide paint by using an inner hole die, the painted copper wire is baked and cured, secondary stretching of the copper wire is carried out by a stretching die after the polyester imide paint is cured, the stretching process is small-proportion stretching, the stretching proportion of the stretching process is crossed, the copper wire only needs to be stretched to 0.2mm, the stretching of the stretching die is carried out for one time, and the surface of the copper wire is painted with three times of polyester imide paint again after the stretching is finished at a stretching speed of 900 m/min. In the embodiment, the painted and cured copper wire is stretched for the second time to form a cracking gap of the paint layer on the surface of the thermosetting polyester imide paint, the paint layer with good adhesiveness can be obtained after the previous polyester imide paint is used as an adhesion layer on the surface of the cracking gap of the polyester imide paint and is painted, meanwhile, the molybdenum-plated layer on the inner side of the paint layer can provide good surface performance for the copper wire, the influence of the stretching for a small proportion on the performance of the annealed copper wire is small, secondary annealing is not needed, and the finished enameled wire can be obtained only by coating a lubricant on the surface of the copper wire after the paint layer is baked and cured, and then performing surface lubrication and rolling.
Under the technical characteristics of the embodiment, the copper wire in the enameled wire has better flexibility and tensile property through annealing and twice stretching, and meanwhile, the molybdenum-plated layer is formed on the surface of the copper wire, so that the formed enameled wire has better surface abrasion resistance. Using a commercially available 0.20mm polyesterimide paint enameled wire with the same size as the enameled wire as a comparison, and applying continuous tensile force to two ends of a copper wire until the copper wire is broken to test the tensile property, wherein the tensile property is improved by 16-19%; and continuously brushing the surface of the enameled wire by using the same soft bristle rolling brush until the area of the copper wire exposed on the surface exceeds 30%, and recording the minimum abrasion duration, so that the abrasion resistance of the enameled wire is improved to 32-46%.
Example two:
in example two, an enamel wire was prepared using an industrial copper rod having a purity of 99.9% and a conductivity of 98.5% as a raw material, and the maximum wire diameter of the enamel wire to be required was defined as 0.49mm, the wire diameter of the copper wire in the enamel wire was 0.44mm, and the diameter of the industrial copper rod as a raw material was 3 mm. The preparation method of the enameled wire comprises the following operation steps:
the method comprises the steps of firstly peeling raw industrial copper rods by using a peeling machine, peeling the surfaces with the surface thickness of 120 mu m, carrying out the whole peeling process under the protection of nitrogen, cleaning the peeled industrial copper rods in a hot water tank, setting the water temperature in the hot water tank to be 78 ℃, and brushing the surfaces of the industrial copper rods passing through the hot water tank by arranging a soft hair cylinder brush at the bottom of the hot water tank.
Preheating the cleaned copper rod to 500 ℃ in a protective gas environment, then sending the copper rod into a pickling tank for pickling in a mode of not contacting with air under the protection of protective gas, and carrying out pickling treatment in the pickling tank by using composite acid as pickling liquid, wherein the composite acid comprises 4 wt% of nitric acid and 13 wt% of sulfuric acid, saturated sodium bisulfate is added into the pickling liquid, and in order to improve the performance of the pickled copper wire, 50ppm of BHA (butylated hydroxyanisole) is used as an antioxidant and 150ppm of sodium persulfate is used as a stabilizer; controlling the pickling time to be 12min, taking out after pickling is finished, and air-drying the surface of the copper wire by using cold air at 5 ℃; and taking out the air-dried copper rod, and electroplating molybdenum to obtain the copper rod with the molybdenum-plated surface.
And then drawing the copper rod with the molybdenum plated on the surface layer, drawing the copper rod with the wire diameter of 2.88mm to 1/5-1/8 of the wire diameter in a primary drawing stage, wherein the drawing process is continuously carried out twice in the embodiment, the drawing speed in the drawing process is 650m/min, the wire diameter of the copper rod is drawn to 1.25mm through a drawing die in the first time of the two continuous drawing processes, the wire diameter of the copper rod is drawn to 0.5mm through the drawing die in the second time, then the copper wire after the primary drawing stage is cleaned according to the cleaning mode of the industrial copper rod, and then annealing treatment is carried out in an annealing furnace at the temperature of 550 ℃.
Painting the surface of the annealed copper wire, in the embodiment, coating four times of polyester imide paint on the surface of the copper wire by using an inner hole die, baking and curing the painted copper wire, performing secondary stretching on the copper wire by using a stretching die after the polyester imide paint is cured, controlling the stretching speed to be 900m/min, stretching the copper wire to the wire diameter of 0.44mm, then coating five times of polyester imide paint on the surface of the stretched copper wire, coating a lubricant on the surface of the copper wire after the paint layer is baked and cured, performing surface lubrication, and then rolling to obtain the finished enameled wire.
Under the technical characteristics of the embodiment, the copper wire in the enameled wire has better flexibility and tensile property through annealing and twice stretching, and meanwhile, the molybdenum-plated layer is formed on the surface of the copper wire, so that the formed enameled wire has better surface abrasion resistance. Using a commercially available 0.44mm polyester imide enameled wire with the same size as the enameled wire as a comparison, and applying continuous tension to two ends of a copper wire until the copper wire is broken to test the tensile property, wherein the tensile property is improved by 19-22%; and continuously brushing the surface of the enameled wire by using the same soft bristle rolling brush until the area of the copper wire exposed on the surface exceeds 30%, and recording the minimum abrasion duration, so that the abrasion resistance of the enameled wire is improved to 38-45%.
Example three:
in example three, an enamel wire was prepared using an industrial copper rod having a purity of 99.9% and a conductivity of 98.5% as a raw material, and the maximum wire diameter of the enamel wire to be required was defined as 0.67mm, the wire diameter of the copper wire in the enamel wire was 0.62mm, and the diameter of the industrial copper rod as a raw material was 3 mm. The preparation method of the enameled wire comprises the following operation steps:
the method comprises the steps of firstly peeling raw industrial copper rods by using a peeling machine, wherein the peeling surface thickness is 150 microns, the whole peeling process is carried out under the protection of nitrogen, the peeled industrial copper rods are cleaned in a hot water tank, the water temperature in the hot water tank is set to be 80 ℃, and a soft hair cylinder brush is arranged at the bottom of the hot water tank to scrub the surfaces of the industrial copper rods passing through the hot water tank.
Preheating the cleaned copper rod to 550 ℃ in a protective gas environment, then sending the copper rod into a pickling tank for pickling in a mode of not contacting with air under the protection of protective gas, and carrying out pickling treatment in the pickling tank by using composite acid as pickling liquid, wherein the composite acid comprises 5 wt% of nitric acid and 10 wt% of sulfuric acid, saturated sodium bisulfate is added into the pickling liquid, and 60ppm of BHT (butylated hydroxytoluene) is added into the pickling liquid as an antioxidant, 130ppm of sodium persulfate is used as a stabilizer and 40ppm of benzotriazole is used as a corrosion inhibitor in order to improve the performance of the pickled copper wire; controlling the pickling time to be 10min, taking out after pickling is finished, and air-drying the surface of the copper wire by using cold air at 6 ℃; and taking out the air-dried copper rod, and electroplating molybdenum to obtain the copper rod with the molybdenum-plated surface.
And then drawing the copper rod with the molybdenum plated on the surface layer, drawing the copper rod with the wire diameter of 2.85mm to 1/5-1/8 of the wire diameter in a primary drawing stage, wherein the drawing process is continuously carried out twice in the embodiment, the drawing speed in the drawing process is 720m/min, the wire diameter of the copper rod is drawn to 1.90mm through a drawing die in the first time of the two continuous drawing processes, the wire diameter of the copper rod is drawn to 0.75mm through the drawing die in the second time, then the copper wire after the primary drawing stage is cleaned according to the cleaning mode of the industrial copper rod, and then annealing treatment is carried out in an annealing furnace at the temperature of 530 ℃.
Painting the surface of the annealed copper wire, in the embodiment, coating six times of polyester imide paint on the surface of the copper wire by using an inner hole die, baking and curing the painted copper wire, performing secondary stretching on the copper wire by using a stretching die after the polyester imide paint is cured, controlling the stretching speed to be 930m/min, stretching the copper wire to the wire diameter of 0.62mm, then coating five times of polyester imide paint on the surface of the stretched copper wire, coating a lubricant on the surface of the copper wire after the paint layer is baked and cured, performing surface lubrication, and then rolling to obtain the finished enameled wire.
Under the technical characteristics of the embodiment, the copper wire in the enameled wire has better flexibility and tensile property through annealing and twice stretching, and meanwhile, the molybdenum-plated layer is formed on the surface of the copper wire, so that the formed enameled wire has better surface abrasion resistance. Using a commercially available 0.62mm polyester imide enameled wire with the same size as the enameled wire as a comparison, and applying continuous tension to two ends of a copper wire until the copper wire is broken to test the tensile property, wherein the tensile property is improved by 23-28%; and continuously brushing the surface of the enameled wire by using the same soft bristle rolling brush until the area of the copper wire exposed on the surface exceeds 30%, and recording the minimum abrasion duration, so that the abrasion resistance of the enameled wire is improved to 36-40%.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The preparation method of the enameled wire with better physical properties is characterized by comprising the following operation steps:
s1, selecting an industrial copper rod with the purity of more than 99.5% and the electric conductivity of more than 98% as a raw material, recording the diameter of the raw material industrial copper rod as M, stripping an oxide layer of the raw material copper rod in a protective gas environment by using a stripping machine, and cleaning the copper rod with the oxide layer stripped;
s2, preheating the cleaned copper rod to 450-600 ℃ in a protective gas environment, and then sending the copper rod into a pickling tank for pickling without contacting with air, wherein the pickling solution is a composite acid and comprises 3-5 wt% of nitric acid and 5-15 wt% of sulfuric acid, and saturated bisulfate is also added into the pickling solution;
s3, cooling the copper rod in a pickling solution to room temperature, taking out the copper rod after pickling, air-drying the surface of the copper rod by using cold air, plating molybdenum on the surface of the copper rod after air-drying, stretching the copper rod for the first time by using a stretching die after a molybdenum plating layer is stable, stretching the copper rod for the first time to be large stretching, and stretching the diameter of the industrial copper rod to N, wherein N is 1/5-1/8M, so that a copper wire I is obtained;
s4, cleaning the copper wire I, annealing after cleaning, painting the surface of the annealed copper wire, and baking and curing after painting to obtain a copper wire II;
and S5, carrying out secondary stretching on the copper wire II to the required diameter of the copper wire, ensuring that the required diameter of the copper wire is 0.85-0.95N, then painting the stretched copper wire again, baking and curing the painted copper wire after painting is finished, coating a lubricant on the surface of the cured copper wire, carrying out surface lubrication, and rolling to obtain the finished enameled wire.
2. The method for preparing an enameled wire with better physical properties according to claim 1, wherein, in the peeling process at step S1, the peeling thickness of the peeling machine on the surface of the industrial copper bar is 100-150 μm.
3. The method for preparing an enamel wire having preferable physical properties according to claim 1, wherein the cleaning is performed in a hot water bath of 70 to 80 ℃ in the steps of S1 and S4.
4. The method for preparing an enameled wire with better physical properties according to claim 3, wherein a soft hair brush is arranged at the bottom of the hot water tank in the length direction, and the surface of the copper rod or the copper wire in the corresponding step is brushed by the soft hair brush.
5. The method for preparing enameled wires with better physical properties according to claim 1, wherein, one or a combination of antioxidant, stabilizer and corrosion inhibitor is added in the pickling solution; the antioxidant is BHA or BHT, and the addition amount is 50-80 ppm; the stabilizer is persulfate, and the addition amount is 120-150 ppm; the corrosion inhibitor is benzotriazole or diethylenetriamine pentamethylene phosphoric acid; the addition amount is 30-120 ppm.
6. The method for preparing an enameled wire with better physical properties according to claim 1, wherein the processing mode of the copper rod molybdenum plating is electroplating.
7. The method for preparing an enamel wire having preferable physical properties according to claim 1, wherein the drawing process is continuously performed 2 to 3 times at the first drawing in step S3, and the drawing rate during the drawing process is controlled to be 650 to 800 m/min.
8. The method for preparing an enamel wire having preferable physical properties according to claim 1, wherein the annealing temperature set in the annealing furnace is 500 to 550 ℃ when the annealing treatment is performed in the step S4.
9. The method for preparing an enamel wire with better physical properties according to claim 1, wherein the second drawing is performed in step S5, and the drawing rate during the drawing is 900 to 950 m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111244803.8A CN113948253B (en) | 2021-10-26 | 2021-10-26 | Preparation method of enameled wire with better physical properties |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111244803.8A CN113948253B (en) | 2021-10-26 | 2021-10-26 | Preparation method of enameled wire with better physical properties |
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| Publication Number | Publication Date |
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| CN113948253A true CN113948253A (en) | 2022-01-18 |
| CN113948253B CN113948253B (en) | 2023-09-05 |
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| CN113948253B (en) | 2023-09-05 |
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