CN117995482A - Rapid forming and insulating method of superconducting wire - Google Patents
Rapid forming and insulating method of superconducting wire Download PDFInfo
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- CN117995482A CN117995482A CN202410404793.7A CN202410404793A CN117995482A CN 117995482 A CN117995482 A CN 117995482A CN 202410404793 A CN202410404793 A CN 202410404793A CN 117995482 A CN117995482 A CN 117995482A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000003973 paint Substances 0.000 claims abstract description 81
- 239000007788 liquid Substances 0.000 claims abstract description 61
- 238000010422 painting Methods 0.000 claims abstract description 42
- 238000000137 annealing Methods 0.000 claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 19
- 239000000725 suspension Substances 0.000 claims abstract description 16
- 238000009413 insulation Methods 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 21
- 230000032683 aging Effects 0.000 claims description 15
- 230000002457 bidirectional effect Effects 0.000 claims description 7
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 7
- 238000010622 cold drawing Methods 0.000 claims description 5
- 230000003746 surface roughness Effects 0.000 claims description 5
- 239000002352 surface water Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 abstract description 4
- 239000007888 film coating Substances 0.000 abstract description 3
- 238000009501 film coating Methods 0.000 abstract description 3
- 239000010949 copper Substances 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 12
- 238000000576 coating method Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 5
- 238000003754 machining Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of superconducting wires, and discloses a rapid forming and insulating method of a superconducting wire. The method comprises the following steps: the superconductive NbTi/Cu composite ingot is extruded, cold drawn, aged heat treated and twisted to prepare a superconductive NbTi/Cu bare round wire; and sequentially carrying out continuous rolling, stretching, cleaning, annealing, painting, solidifying and cooling steps on the superconducting NbTi/Cu bare round wire to obtain the enameled superconducting flat wire. In addition, the uniformity and stability of wire painting are further improved by adding a straightening die, using a paint liquid tank and a suspension die for controlling the temperature and the liquid level, and the like. The invention adopts a continuous processing technology to realize the molding and insulation of the superconducting wire. Compared with the conventional processing mode, the method provided by the invention has the advantages of high production efficiency, uniform paint film coating and excellent wire insulation performance.
Description
Technical Field
The invention belongs to the technical field of superconducting wires, and relates to a rapid forming and insulating method of a superconducting wire.
Background
Enameled superconducting flat wires are an important component of wound nuclear Magnetic Resonance (MRI) magnets, and as the market demand for MRI increases, the demand for enameled superconducting flat wires also increases. The conventional production process of the international enamelled superconducting flat wire mainly comprises rolling and pulling a superconducting bare round wire into a flat wire, and then painting and insulating the flat wire. Aiming at the process, rolling forming and painting insulation are divided into two working procedures, and the production efficiency is lower. In addition, because the superconducting wire belongs to composite material, hardness is higher, stress is difficult to release after rolling and drawing forming and leads to wire to have side bending, and the inclination easily occurs when the flat wire is painted and makes the paint film coating uneven, and flat wire insulating property reduces, influences the quality of enamelled superconducting flat wire.
At present, the forming process of the enamelled copper wire mainly adopts the steps of rolling and stretching the copper wire into a flat wire, and then painting and insulating the flat wire. The process can realize one-time completion of rolling, stretching and painting, namely a continuous rolling continuous drawing continuous coating process, and meanwhile, a paint film is not damaged, so that the insulation performance of the wire rod is ensured, and the production efficiency is greatly improved. However, because the enameled superconducting flat wire is smaller in size and thinner in paint film, the requirement on insulation performance is high (the breakdown voltage of the insulated wire is more than 4000V), and the wire needs to be twisted in order to reduce hysteresis loss in the preparation process of the superconducting wire, so that the wire is easy to incline when rolled and pulled into the flat wire, and the problem of poor painting effect of the superconducting flat wire is further aggravated. Therefore, the continuous rolling and continuous drawing continuous coating process has not been widely used in the processing of superconducting wires. For the characteristics of the superconducting flat wire, improvement of the forming and insulating method is needed to improve the production efficiency and the insulating performance.
Disclosure of Invention
In view of this, the present inventors have proposed a method for rapid forming and insulating a superconducting wire, so as to overcome the technical defects of low processing efficiency and poor insulating performance of the superconducting flat wire in the prior art.
The invention provides a rapid forming and insulating method of a superconducting wire, which comprises the following steps:
s1, extruding, cold drawing, aging heat treatment, twisting and final stretching the superconductive NbTi/Cu composite ingot to obtain the superconductive NbTi/Cu bare round wire.
S2, loading the superconducting NbTi/Cu bare round wire into a paying-off device, and passing the wire through a bidirectional roller to obtain the wire with flattened upper and lower surfaces.
And S3, passing the wire rod through a stretching die, and stretching to a size of 0.800 multiplied by 0.500 mm-3.000 multiplied by 2.000 mm.
S4, the stretched wire rod enters an ultrasonic cleaning tank for surface cleaning, and then the wire rod is air-dried to remove water stains on the surface.
S5, passing the wire rod through an annealing furnace for annealing, and naturally cooling after the annealing is finished.
S6, vertically upwards passing the wire through the correction die 2.
S7, the wire passes through a paint liquid groove 8, so that the surface of the wire is coated with insulating paint 3, then passes through a vertical suspension die 5, excessive paint liquid on the surface is scraped off, and finally the surface of the wire is baked in a baking oven 6, so that a surface paint film is cured.
S8, repeating the step 8-12 times in the step 7 to obtain the enameled superconducting flat wire with the paint film thickness of 0.03-0.30 mm. The schematic diagram of the enamelled superconductive flat wire enamelling module is shown in figure 1. As shown in fig. 1, 1 is a superconducting flat wire; 2 is a correction mould; 3 is insulating paint in a paint liquid tank; 4 is a heating resistor; 5 is a vertical suspension mould, the lower part is a first painting mould, and the upper part is a second painting mould; 6 is a baking oven; 7 is a liquid level sensor; 8 is a paint liquid groove. And 8-12 times of the step S7, and obtaining the enameled superconducting flat wire with the specified paint film thickness.
S9, cooling the enameled superconducting flat wire, and closely arranging the enameled superconducting flat wire to a wire-collecting wheel.
Further, in S1, in the process of processing the superconducting NbTi/Cu composite ingot into a superconducting NbTi/Cu bare round wire, the processing rate of each processing pass is less than or equal to 40%, the ageing times are 3-6, and the single ageing is carried out for 10 hours.
Further, in S2-S3, rolling and stretching speeds are 5-30 m/min, after rolling and stretching, tension is kept stable by passing through a tension wheel, and a correction die is added before stretching and after stretching to ensure the flatness of the wire.
Further, in S2, the bi-directional roll surface roughness Ra < 0.5.
In the step S3, the stretching die is a polycrystalline die, the roughness Ra is smaller than 0.2, the R angle range is 0.25-0.5 mm, and the processing rate of stretching molding is smaller than 40%.
Further, in S5, the annealing temperature is 300-500 ℃.
Further, in S6, the size of the correction die 2 is 0.001-0.002mm smaller than the size of the superconducting flat wire, and the length of the diameter-entering area of the die is 2-3 times that of a conventional die, so that the superconducting flat wire is ensured not to twist.
Further, in S7, the heating resistor 4 and the liquid level sensor 7 are installed in the paint liquid tank 8; the heating resistor 4 is used for heating the insulating paint 3, and the liquid level sensor 7 is used for controlling the liquid level temperature and the liquid level height; the temperature difference of the insulating paint 3 in the paint liquid groove 8 is +/-1 ℃, the liquid level height difference is +/-1 mm, and the insulating paint is used for guaranteeing the uniformity of paint liquid coating of the superconducting wire.
Further, the vertical suspension molds 5 comprise two molds, namely a first painting mold and a second painting mold from bottom to top; the first painting die is 3-5% larger than the second painting die in size; the second painting die is in a suspension state, and the position of the die can be freely adjusted according to the flowing condition of paint liquid and the angle of wires;
Further, the R angle of the second painting die is 10-30% smaller than that of the wire rod, so that the paint film is uniformly coated.
In addition, the invention also claims a superconducting wire prepared by the method.
Compared with the prior art, the technical scheme provided by the invention has at least the following beneficial effects:
The invention provides a continuous processing method of an enamelled superconducting flat wire, which adopts a continuous rolling continuous drawing continuous coating process to continuously carry out the steps of rolling, stretching, cleaning, annealing, painting, solidifying, cooling and the like of the wire, thereby greatly improving the processing efficiency of the existing enamelled superconducting flat wire.
According to the invention, the correction die is added before painting, and the paint liquid tank, the suspension die and the like for controlling the temperature and the liquid level height are used, so that the uniformity and the stability of the superconducting flat wire painting are improved.
The invention completes rolling forming and painting insulation at one time, does not need to wind and twist wires before painting, and avoids uneven paint film coating caused by wire twisting and tilting.
Compared with the conventional technology, the enameled superconducting flat wire prepared by the invention has stronger insulating property and less pinholes per kilometer.
Drawings
Fig. 1 is a schematic diagram of the enamelled superconducting flat wire enamelling module.
The attached drawings are used for identifying and describing: 1 is a superconductive flat wire; 2 is a correction mould; 3 is insulating paint in a paint liquid tank; 4 is a heating resistor; 5 is a vertical suspension mould (a first painting mould is arranged below and a second painting mould is arranged above); 6 is a baking oven; 7 is a liquid level sensor; 8 is a paint liquid groove.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a rapid forming and insulating method of a superconducting wire, which comprises the following steps:
S1, extruding, cold drawing, aging heat treatment and twisting a superconductive NbTi/Cu composite ingot to prepare the superconductive NbTi/Cu bare round wire.
S2, loading the superconducting NbTi/Cu bare round wire into a paying-off device, and passing the wire through a bidirectional roller to obtain the wire with flattened upper and lower surfaces.
And S3, passing the wire rod through a stretching die, and stretching to a size of 0.800 multiplied by 0.500 mm-3.000 multiplied by 2.000 mm.
S4, the stretched wire rod enters an ultrasonic cleaning tank for surface cleaning, and then the wire rod is air-dried to remove water stains on the surface.
S5, passing the wire rod through an annealing furnace for annealing, and naturally cooling after the annealing is finished.
S6, vertically upwards passing the wire through the correction die 2.
S7, the wire passes through a paint liquid groove 8, so that the surface of the wire is coated with insulating paint 3, then passes through a vertical suspension die 5, excessive paint liquid on the surface is scraped off, and finally the surface of the wire is baked in a baking oven 6, so that a surface paint film is cured.
S8, repeating the step 8-12 times in the step 7 to obtain the enameled superconducting flat wire with the paint film thickness of 0.03-0.30 mm. The schematic diagram of the enamelled superconductive flat wire enamelling module is shown in figure 1. As shown in fig. 1, 1 is a superconducting flat wire; 2 is a correction mould; 3 is insulating paint in a paint liquid tank; 4 is a heating resistor; 5 is a vertical suspension mould, the lower part is a first painting mould, and the upper part is a second painting mould; 6 is a baking oven; 7 is a liquid level sensor; 8 is a paint liquid groove. And 8-12 times of the step S7, and obtaining the enameled superconducting flat wire with the specified paint film thickness.
S9, cooling the enameled superconducting flat wire, and closely arranging the enameled superconducting flat wire to a wire-collecting wheel.
Illustratively, in S1, in the process of processing the superconducting NbTi/Cu composite ingot into a superconducting NbTi/Cu bare round wire, the processing rate of each processing pass is less than or equal to 40%, the ageing times are 3-6, and the single ageing is carried out for 10 hours.
Illustratively, in S2-S3, rolling and stretching speeds are 5-30 m/min, after rolling and stretching, tension is kept stable by passing through a tension wheel, and a correction die is added before and after stretching to ensure the flatness of the wire.
Illustratively, in S2, the bi-directional roll surface roughness Ra < 0.5.
Illustratively, in S3, the stretching die is a polycrystalline die, the roughness Ra is less than 0.2, the r angle range is 0.25-0.5 mm, and the processing rate of stretch forming is less than 40%.
Illustratively, in S5, the annealing temperature is 300-500 ℃.
Illustratively, in S6, the size of the straightening die 2 is 0.001-0.002mm smaller than the size of the superconducting flat wire, and the length of the diameter-entering area of the die is 2-3 times that of a conventional die, so as to ensure that the superconducting flat wire is not twisted.
Illustratively, in S7, the paint liquid bath 8 has a heating resistor 4 and a liquid level sensor 7 mounted therein; the heating resistor 4 is used for heating the insulating paint 3, and the liquid level sensor 7 is used for controlling the liquid level temperature and the liquid level height; the temperature difference of the insulating paint 3 in the paint liquid groove 8 is +/-1 ℃, the liquid level height difference is +/-1 mm, and the insulating paint is used for guaranteeing the uniformity of coating of the superconducting wire paint liquid.
Illustratively, the vertical suspension molds 5 each comprise two molds, a first painting mold and a second painting mold, respectively, from bottom to top; the first painting die is 3-5% larger than the second painting die in size; the second painting die is in a suspension state, and the position of the die can be freely adjusted according to the flowing condition of paint liquid and the angle of wires;
Illustratively, the R angle of the second painting die is 10-30% smaller than the R angle of the wire to ensure uniform coating of the paint film.
Example 1
The present embodiment provides a method for rapid forming and insulating superconducting wires with an insulation specification of 1.250mm×0.850 mm.
S1, extruding, cold drawing, aging heat treatment and twisting a superconductive NbTi/Cu composite ingot to prepare the superconductive NbTi/Cu bare round wire. In S1, the machining rate of each machining pass is 30%, 3 times of ageing heat treatment are carried out at intervals, and single ageing is carried out for 10 hours, so that the superconducting NbTi/Cu bare round wire phi=1.200 mm is obtained.
S2, loading the superconducting NbTi/Cu bare round wire into a paying-off device, and passing the wire through a bidirectional roller to obtain the wire with flattened upper and lower surfaces. Both sides are arc-shaped, and the height of the upper part and the lower part is 0.800mm. The surface roughness Ra of the bidirectional roller is 0.40 mu m. After rolling, the wire rod passes through the tension wheel and then is rectified by the rectifying die.
S3, the wire rod passes through a stretching die, the dimension of the stretched flat wire is 1.150mm multiplied by 0.750mm, the processing rate in the stretching process is 28%, the roughness Ra of the stretching die is 0.15 mu m, the R angle is 0.30mm, the wire rod is lubricated by using lubricating liquid during stretching, and the die is cooled by using circulating cooling water. After the wire is stretched, the wire is passed through a tension wheel and a straightening die.
S4, the stretched wire rod enters an ultrasonic cleaning tank for surface cleaning, and then the wire rod is air-dried to remove water stains on the surface. In S4, the water surface in the pool is covered by the wire rod, and ultrasonic cleaning is carried out for 3min.
S5, passing the wire rod through an annealing furnace for annealing, and naturally cooling after the annealing is finished. In S5, the annealing temperature is 320-330 DEG C
S6, vertically upwards passing the wire through a correction die. In S6, the size of the correcting die is 0.001mm smaller than that of the superconducting flat wire, and the length of the diameter entering area of the die is 2.3 times that of a conventional die.
S7, the wire passes through a paint liquid groove to coat insulating paint on the surface of the wire, then passes through a vertical suspension die, scrapes off superfluous paint liquid on the surface, and finally bakes the surface of the wire in a baking oven to solidify a surface paint film. In S7, insulating paint in a paint liquid groove is heated at constant temperature by using a heating resistor, and is fully stirred, and is coated on the surface of the wire rod, wherein the temperature of the paint liquid groove is 29+/-1 ℃, and the liquid level is 70+/-1 mm. And (4) scraping off superfluous paint liquid on the surface by using a first painting die and a second painting die in each pass. The first paint die is 3% larger in size than the second paint die, and the R angle of the second paint die is 10% smaller than the R angle of the wire.
S8, repeating the step S7 for 10 times to obtain the enameled superconducting flat wire with the specified paint film thickness.
S9, cooling the enameled superconducting flat wire, and closely arranging the enameled superconducting flat wire to a wire-collecting wheel.
4 Wires are prepared by the method of the embodiment 1, and the detection shows that the size error range of the 4 wires is within +/-0.003 mm, 4 groups of wires are measured, and the average breakdown voltage of samples is more than 5000V. The number of pinholes per kilometer of the whole wire is less than 0.5 under the condition of 1000V high-voltage pinhole detection equipment. Example 1 molding and painting is a continuous process with higher molding and insulation efficiency. In addition, through adding correction mould, reducing the R angle of painting mould and paint liquid groove optimization for the insulating properties of painted flat wire promotes.
Comparative example 1
The method for forming and insulating the superconducting wire by the existing technology is that the superconducting bare round wire is firstly rolled and formed and then painted for insulation. 3 wires were prepared by the processing method of comparative example 1, and the dimension error of the 3 wires was found to be + -0.005 mm by inspection. The 4-wire prepared in example 1 was compared with the 3-wire prepared in comparative example 1 as follows:
TABLE 1 comparison of the wire properties prepared in example 1 and comparative example 1
As can be seen from Table 1, the average breakdown voltage of the wire rod prepared in comparative example 1 is less than 5000V, and the number of pinholes per kilometer of the whole wire rod is more than 1 under the condition of 1000V high-voltage pinhole detection equipment. The wire quality of this example 1 is better and the insulation performance is better than that of comparative example 1.
Example 2
The present embodiment provides a method for rapid forming and insulating superconducting wires with insulation specifications of 1.680mm×1.230 mm.
S1, extruding, cold drawing, aging heat treatment and twisting a superconductive NbTi/Cu composite ingot to prepare the superconductive NbTi/Cu bare round wire. In S1, the machining rate of each machining pass is 30%, 6 times of aging heat treatment are carried out at intervals, and single aging is carried out for 10 hours, so that the superconducting NbTi/Cu bare round wire phi=1.680 mm is obtained.
S2, loading the superconducting NbTi/Cu bare round wire into a paying-off device, and passing the wire through a bidirectional roller to obtain the wire with flattened upper and lower surfaces. Both sides are arc-shaped, and the height of the upper part and the lower part is 1.200mm. The surface roughness Ra of the bidirectional roller is 0.40 mu m. After rolling, the wire rod passes through the tension wheel and then is rectified by the rectifying die.
S3, the wire rod passes through a stretching die, the wire rod is stretched to 1.600mm multiplied by 1.150mm, the processing rate in the stretching process is 21%, the roughness Ra of the stretching die is 0.15 mu m, the R angle is 0.4mm, the wire rod is lubricated by using lubricating liquid during stretching, and the die is cooled by using circulating cooling water. After the wire is stretched, the wire is passed through a tension wheel and a straightening die.
S4, the stretched wire rod enters an ultrasonic cleaning tank for surface cleaning, and then the wire rod is air-dried to remove water stains on the surface. In S4, the water surface in the pool is covered by the wire rod, and the ultrasonic cleaning time is 4min.
S5, passing the wire rod through an annealing furnace for annealing, and naturally cooling after the annealing is finished. In S5, the annealing temperature is 340-350 DEG C
S6, vertically upwards passing the wire through a correction die. In S6, the size of the correcting die is 0.002mm smaller than that of the superconducting flat wire, and the length of the diameter entering area of the die is 2.5 times that of a conventional die.
S7, the wire passes through a paint liquid groove to coat insulating paint on the surface of the wire, then passes through a vertical suspension die, scrapes off superfluous paint liquid on the surface, and finally bakes the surface of the wire in a baking oven to solidify a surface paint film. In S7, insulating paint in a paint liquid groove is heated at a constant temperature by using a heating resistor, and is fully stirred, and the insulating paint is coated on the surface of the wire rod, wherein the temperature of the paint liquid groove is 32+/-1 ℃, and the liquid level is 75+/-1 mm. And (4) scraping off superfluous paint liquid on the surface by using a first painting die and a second painting die in each pass. The first paint die is 5% larger in size than the second paint die, and the R angle of the second paint die is 30% smaller than the R angle of the wire.
S8, repeating the step S7 for 10 times to obtain the enameled superconducting flat wire with the specified paint film thickness.
S9, cooling the enameled superconducting flat wire, and closely arranging the enameled superconducting flat wire to a wire-collecting wheel.
3 Wires are prepared by the method of the embodiment 2, the error range of the 3 wires is within +/-0.003 mm, 4 groups of wires are measured per wire, the average breakdown voltage of samples is more than 5000V, and the number of pinholes per kilometer of the whole wire is less than 0.5 under 1000V high-voltage pinhole detection equipment. In addition, the insulation performance of the painted flat wire is improved by optimizing the addition of a straightening tool, the reduction of the R angle of a painting die and a paint liquid tank.
Comparative example 2
The method for forming and insulating the superconducting wire by the existing technology is that the superconducting bare round wire is firstly rolled and formed and then painted for insulation. 3 wires were prepared by the processing method of comparative example 2. The detection shows that the dimension error of the branch wire is +/-0.005 mm. The 3-wire prepared in example 2 was compared with the 3-wire prepared in comparative example 2 in terms of performance as follows:
TABLE 2 comparison of wire properties prepared in example 2 and comparative example 2
As can be seen from Table 2, the average breakdown voltage of the wire rod prepared in comparative example 2 is less than 5000V, and the number of pinholes per kilometer of the whole wire rod is more than 1 under the condition of 1000V high-voltage pinhole detection equipment. This example 2 has better wire quality and better insulation performance than comparative example 2.
The embodiments described above are only some, but not all, embodiments of the invention. The detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments obtained without inventive effort by a person skilled in the art, which are related deductions and substitutions made by the person skilled in the art under the condition of the inventive concept, are within the scope of protection of the present invention.
Claims (10)
1. A method for rapid prototyping and insulation of a superconducting wire, comprising:
S1, preparing a superconducting NbTi/Cu bare round wire by extruding, cold drawing, aging heat treatment and twisting a superconducting NbTi/Cu composite ingot;
s2, loading the superconducting NbTi/Cu bare round wire into a paying-off device, and passing the wire through a bidirectional roller to obtain a wire rod with flattened upper and lower surfaces;
s3, the wire rod passes through a stretching die and is stretched to a size of 0.800 multiplied by 0.500 mm-3.000 multiplied by 2.000 mm;
s4, the stretched wire rod enters an ultrasonic cleaning tank for surface cleaning, and then the wire rod is air-dried to remove surface water stains;
s5, enabling the wire rod to pass through an annealing furnace for annealing, and naturally cooling after annealing is finished;
s6, vertically upwards passing the wire through a correction die;
s7, the wire passes through a paint liquid groove to coat insulating paint on the surface of the wire, then passes through a vertical suspension die, scrapes off superfluous paint liquid on the surface, and finally bakes the surface of the wire to solidify a surface paint film;
s8, repeating the step 8-12 times in the step 7 to obtain the enameled superconducting flat wire with the specified paint film thickness;
s9, cooling the enameled superconducting flat wire, and closely arranging the enameled superconducting flat wire to a wire-collecting wheel.
2. The method according to claim 1, wherein in the step S1, in the process of processing the superconducting NbTi/Cu composite ingot into the superconducting NbTi/Cu bare round wire, the processing rate of each processing pass is less than or equal to 40%, the aging times are 3-6, and the single aging is 10 hours.
3. The method according to claim 1, wherein in the steps S2 to S3, rolling and stretching speeds are 5 to 30m/min, tension is kept stable by passing through a tension wheel after rolling and stretching, and a correction die is added before and after stretching to ensure the flatness of the wire.
4. The method according to claim 1, characterized in that in S2 the bi-directional roll surface roughness Ra < 0.5 μm.
5. The method of claim 1, wherein in S3, the drawing die is a polycrystalline die, the roughness Ra is less than 0.2 μm, the R angle is in the range of 0.25 to 0.50mm, and the processing rate of drawing is less than 40%.
6. The method of claim 1, wherein in S5, the annealing temperature is 300-500 ℃.
7. The method of claim 1, wherein in S6, the corrective die size is 0.001-0.002mm smaller than the superconducting flat wire size, and the die run length is 2-3 times that of a conventional die.
8. The method according to claim 1, wherein in S7, a heating resistor and a liquid level sensor are installed in the paint liquid tank; the heating resistor is used for heating the insulating paint, and the liquid level sensor is used for controlling the liquid level temperature and the liquid level height; the temperature difference of the paint liquid tank is +/-1 ℃, and the liquid level height difference is +/-1 mm.
9. The method of claim 1, wherein the vertical suspension mold comprises two molds, a first painting mold and a second painting mold, respectively, from bottom to top; the first painting die is 3-5% larger than the second painting die in size; the second painting die is in a suspension state, and the position of the die can be freely adjusted according to the flowing condition of the paint liquid and the angle of the wire rod.
10. The method of claim 1, wherein the R-angle of the second paint die is 10-30% less than the R-angle of the wire.
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| CN206460809U (en) * | 2017-03-02 | 2017-09-01 | 格力电工（马鞍山）有限公司 | It is a kind of to improve the enamelled wire paint system of paint film tack |
| CN206789329U (en) * | 2017-05-19 | 2017-12-22 | 烟台思为线材技术有限公司 | It is fine vertical around enameling copper strap wire manufacturing equipment |
| CN215917988U (en) * | 2021-08-20 | 2022-03-01 | 白银有色长通电线电缆有限责任公司 | Ultra-fine enameled product production line oiling station |
| CN114141435A (en) * | 2021-11-26 | 2022-03-04 | 江苏锡洲新材料科技有限公司 | Painting device for enameled flat wire |
| CN114496417A (en) * | 2022-02-28 | 2022-05-13 | 先登高科电气有限公司 | Painting process of enameled wire and vertical suspension mold |
| CN115295249A (en) * | 2022-08-23 | 2022-11-04 | 中天科技装备电缆有限公司 | Cable painting production method |
| CN217933306U (en) * | 2022-07-19 | 2022-11-29 | 惠州市登高达电业有限公司 | Novel heating of bull felt japanning enamelling machine paint groove device |
| CN116313314A (en) * | 2023-03-17 | 2023-06-23 | 宁波金田电磁科技有限公司 | Enameled flat wire and preparation method thereof |
| CN116994821A (en) * | 2023-08-04 | 2023-11-03 | 西安聚能超导线材科技有限公司 | Method for improving surface quality of NbTi superconducting wire painting |
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2024
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| JP2016172245A (en) * | 2015-03-18 | 2016-09-29 | 株式会社仲田コーティング | Bus bar coater and bus bar coating method |
| CN206460809U (en) * | 2017-03-02 | 2017-09-01 | 格力电工（马鞍山）有限公司 | It is a kind of to improve the enamelled wire paint system of paint film tack |
| CN107086090A (en) * | 2017-04-17 | 2017-08-22 | 格力电工（马鞍山）有限公司 | The preparation method of enamel-covered wire |
| CN206789329U (en) * | 2017-05-19 | 2017-12-22 | 烟台思为线材技术有限公司 | It is fine vertical around enameling copper strap wire manufacturing equipment |
| CN215917988U (en) * | 2021-08-20 | 2022-03-01 | 白银有色长通电线电缆有限责任公司 | Ultra-fine enameled product production line oiling station |
| CN114141435A (en) * | 2021-11-26 | 2022-03-04 | 江苏锡洲新材料科技有限公司 | Painting device for enameled flat wire |
| CN114496417A (en) * | 2022-02-28 | 2022-05-13 | 先登高科电气有限公司 | Painting process of enameled wire and vertical suspension mold |
| CN217933306U (en) * | 2022-07-19 | 2022-11-29 | 惠州市登高达电业有限公司 | Novel heating of bull felt japanning enamelling machine paint groove device |
| CN115295249A (en) * | 2022-08-23 | 2022-11-04 | 中天科技装备电缆有限公司 | Cable painting production method |
| CN116313314A (en) * | 2023-03-17 | 2023-06-23 | 宁波金田电磁科技有限公司 | Enameled flat wire and preparation method thereof |
| CN116994821A (en) * | 2023-08-04 | 2023-11-03 | 西安聚能超导线材科技有限公司 | Method for improving surface quality of NbTi superconducting wire painting |
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