Manufacturing method of automobile seat heating enameled wire

Abstract

The invention provides an automobile seat heating enameled wire manufacturing method, which relates to the technical field of enameled wire manufacturing, and comprises the following steps: paying off: selecting a paying-off device according to the specification and production requirement of an enameled wire, and setting paying-off tension; annealing: preheating, annealing and cooling the wire, and introducing steam to prevent oxidation; performing surface treatment: performing freezing treatment on the annealed wire, and enabling the surface of the wire to be full of water drops in a high-humidity and high-temperature environment; painting: uniformly coating the paint liquid on the surface of the wire by using painting equipment, and controlling the flow and temperature of the paint liquid; drying and cooling: drying the painted wire in a drying furnace, and then cooling to room temperature; and winding: winding the dried and cooled enameled wire by using a winding machine, and setting the winding tension. By accurately controlling each production link, the electrical performance, the mechanical performance and the production efficiency of the enameled wire are improved, the production cost is reduced, and the high requirement of an automobile seat heating system on the enameled wire is met.

Description

Technical Field

[0001] The invention relates to the technical field of enameled wire manufacturing, in particular to a method for manufacturing an enameled wire for automobile seat heating. Background Art

[0002] In the car seat heating system, enameled wire is a key electrical connection and heat conduction component, and its manufacturing quality directly affects the efficiency and safety of seat heating. Traditional enameled wire manufacturing methods often have problems such as insufficient surface treatment, uneven painting, and poor drying effect, which makes it difficult for the electrical and mechanical properties of the enameled wire to meet high standards. Especially in the various production links such as wire release, annealing, surface treatment, painting, drying and cooling, and wire winding, any slight negligence may have a significant impact on the quality of the final product. For example, improper tension control during wire release can cause wire damage or wire paralleling problems; inaccurate temperature and time control during annealing will affect the softness and resistivity of the wire; incomplete surface treatment will affect the adhesion of the paint liquid and the uniformity of the paint film; errors in flow and temperature control during painting will lead to uneven paint film thickness or defects; improper temperature and time control in the drying and cooling links will affect the curing effect of the paint film and the overall performance of the wire; and tension control and wire coil management during winding are directly related to the packaging, transportation and storage quality of the product. Summary of the invention

[0003] The present invention aims to provide an optimized method for manufacturing enameled wire for automobile seat heating, which improves the electrical properties, mechanical properties and production efficiency of the enameled wire by precisely controlling each production link, reduces production costs, and meets the high requirements of the automobile seat heating system for the enameled wire.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: A method for manufacturing a heating enameled wire for an automobile seat comprises the following steps:

[0005] S1. Paying off: Select the pay-off device according to the specifications of the enameled wire and production requirements, and set the pay-off tension;

[0006] S2, Annealing: preheating, annealing and cooling the wire, while introducing steam to prevent oxidation;

[0007] S3, surface treatment: freeze the annealed wire and make its surface covered with water droplets in a high humidity and high temperature environment;

[0008] S4, painting: Use painting equipment to evenly coat the paint liquid on the surface of the wire, and control the flow rate and temperature of the paint liquid;

[0009] S5, drying and cooling: drying the painted wire in a drying furnace, and then cooling to room temperature;

[0010] S6. Wire taking-up: Use the wire taking-up machine to reel up the dried and cooled enameled wire and set the wire taking-up tension.

[0011] In some embodiments, in step S1, the wire pay-off device includes a radial rotary wire pay-off, an over-the-end or brush wire pay-off, a brush or double-cone sleeve wire pay-off.

[0012] In some embodiments, in step S2, the temperature of the annealing zone is controlled at 400°C-550°C.

[0013] In some embodiments, in step S3, the temperature of the freezing treatment is controlled between -30°C and -50°C, lasting for 5 min-10 min, the humidity of the high humidity and high temperature environment is maintained at 90%-95%, and the temperature is controlled at 40°C-50°C.

[0014] In some embodiments, in step S5, the drying temperature is controlled between 450°C and 250°C.

[0015] In some embodiments, in step S6, the wire take-up machine includes a disk-type wire take-up machine, a drum-type wire take-up machine, or a barrel-type wire take-up machine, and the wire take-up tension is controlled within a range of 10%-15% of the non-extension tension of the enameled wire.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention effectively cleans the surface of the wire and increases its wettability through freezing treatment and water droplet formation under high humidity and high temperature environment, so that the paint liquid can be more evenly attached to the surface of the wire to form a smoother and continuous paint film, thereby improving the adhesion of the paint film. In addition, the surface of the wire evenly covered with water droplets avoids the flow, aggregation or loss of the paint liquid due to uneven surface tension during painting, ensuring the thickness and uniformity of the paint film. This helps to improve the insulation resistance, tensile strength and wear resistance of the enameled wire. In addition, the stable surface state provides a predictable basis for the painting process, so that key parameters such as the rotation speed of the painting wheel and the flow rate of the paint liquid can be more accurately regulated, thereby improving the automation of the production line and the consistency of product quality. By pre-treating the surface of the wire, paint defects such as bubbles, cracks or peeling caused by surface contamination, oxidation or grease residue are also effectively reduced, thereby improving the qualified rate of the product and reducing the production cost. In addition, the present invention not only improves the manufacturing quality of the enameled wire, but also optimizes the production process and improves efficiency by precisely controlling the parameters of each production link, thereby providing a more reliable and efficient enameled wire product for the production and application of automobile seat heating systems. DETAILED DESCRIPTION

[0018] This embodiment provides a method for manufacturing a heating enameled wire for an automobile seat, comprising the following steps:

[0019] S1. Paying off: Select the pay-off device according to the specifications and production requirements of the enameled wire. For large-gauge wires (such as copper wires with a diameter greater than 1mm), use a radial rotary pay-off; for medium-gauge wires (diameters between 0.5mm and 1mm), use an over-the-end or brush pay-off; for fine-gauge wires (diameters less than 0.5mm), use a brush or double-cone sleeve pay-off.

[0020] It should be noted that the surface of the bobbin used for winding the wire should be smooth and undamaged. The sides of the bobbin's core and the inside and outside of the side panels should have fillets with a radius of 2mm-4mm. The core refers to the central part of the bobbin, which is usually cylindrical or similar in shape, used to directly support and fix the wire. The sides of the core refer to the two end faces or edge areas of the central part (core) of the bobbin. These areas may come into contact with the wire during the pay-off process, so special attention should be paid to their surface finish and fillet treatment to avoid damage to the wire. The side panels usually refer to the flat plates or similar structures on both sides of the bobbin used to fix and support the wire. Together with the core, they constitute the main structure of the bobbin. The inside and outside of the side panels refer to the inner surface (i.e. the side in direct contact with the wire) and the outer surface (i.e. the side not in direct contact with the wire). Similarly, the surface finish and fillet treatment of these areas are also very important to ensure that the wire can be released evenly and smoothly during the pay-off process and avoid unnecessary scratches. In addition, after the bobbin is processed, a dynamic and static balance test should be carried out to ensure that it does not produce excessive vibration and noise when rotating at high speed.

[0021] In addition, the pay-off tension is one of the key factors affecting the quality of the enameled wire. Excessive tension may cause the conductor to be stretched thin, the surface to lose its gloss, and affect the elongation, resilience and other properties of the enameled wire; while too little tension may cause the wire to jump easily, resulting in problems such as wire merging and wire hitting the furnace mouth. Therefore, it is necessary to accurately set the pay-off tension according to factors such as the specifications, materials and production speed of the conductor. Generally speaking, the pay-off tension should be controlled at about 20% of the non-extension tension. For example, for a soft copper wire with a diameter of 1 mm, its maximum non-extension tension at room temperature is about 15 kg / mm 2 , then the pay-off tension should be controlled at 3kg / mm 2 So in order to control the pay-off tension more accurately, an active control solution can be adopted. The specific method is to install a tension sensor on the pay-off device to monitor the tension change of the enameled wire in real time and feed the signal back to the control system. The control system dynamically adjusts the pay-off speed or applies additional tension compensation according to the feedback signal to ensure that the tension is constant within the set range. Installing a booster wheel in front of the annealing furnace is also an effective means to control the pay-off tension. The booster wheel assists the pay-off by providing a certain friction force, thereby reducing the resistance fluctuation during the pay-off process. The pressure and speed of the booster wheel need to be adjusted according to the specifications of the wire and the production speed to achieve the best tension control effect.

[0022] It should be noted that when replacing the bobbin, special attention should be paid to the handling of the joint. The joint should be flat and firm, and the resistance value should be as small as possible to avoid affecting the electrical properties of the enameled wire. At the same time, the downtime should be minimized during the wire replacement process to improve production efficiency. For used bobbins, they should be cleaned, inspected and repaired in time. In particular, the surface and fillet of the bobbin should be ensured to be free of damage, oil and other impurities to avoid affecting the quality and stability of subsequent pay-off. In addition, during the pay-off process, the operator should strictly abide by the safety operating procedures and wear personal protective equipment (such as gloves, goggles, etc.) to prevent accidents such as scratches or burns on the wire.

[0023] Taking the soft copper wire with a diameter of 1.00mm as an example, its maximum non-extension tension is about 15kg / mm 2 , then in the actual production process, the pay-off tension can be set to 3kg / mm 2 At the same time, the pressure and speed of the power wheel can be adjusted according to the actual situation to achieve the best tension control effect. In addition, parameters such as the pay-off speed and the spool speed also need to be reasonably set according to production requirements and equipment performance.

[0024] S2. Annealing: Before the wire enters the annealing furnace, it is first preheated to gradually increase the temperature of the wire to avoid thermal stress caused by sudden heating. The preheating temperature is generally controlled within a lower temperature range below the melting point of the wire, and the specific temperature is set according to the material and specifications of the wire.

[0025] Next, the preheated wire is sent to the annealing furnace. A continuous annealing furnace can be used. The furnace body material should have good high temperature resistance and heat preservation performance. For example, high temperature resistant alloy or stainless steel material should be used. According to the material and required performance of the wire, the annealing temperature and time should be accurately controlled. The length of the annealing furnace needs to be adjusted according to the specifications of the enameled wire (such as diameter, material) and the line speed, generally ranging from tens of meters to hundreds of meters per minute. For thicker enameled wires, a longer annealing furnace is required to ensure sufficient annealing. The maximum temperature of the annealing zone is generally controlled at around 500°C, but the specific temperature needs to be adjusted according to the material of the enameled wire and the required annealing effect. For example, the annealing temperature of copper wire is usually between 400°C and 550°C, and the annealing time is appropriately adjusted according to the temperature distribution in the furnace, the wire specifications and the annealing effect. During the annealing process, the temperature in the furnace needs to be kept uniform to avoid local overheating that causes the performance of the wire to deteriorate. In addition, during the annealing process, in order to prevent the wire from oxidizing, steam needs to be introduced into the annealing furnace to remove the oxygen in the furnace. The steam flow rate needs to be adjusted according to the volume and line speed of the annealing furnace to ensure that the atmosphere in the furnace is uniform and sufficient to protect the copper wire from oxidation.

[0026] After annealing, the wire needs to be cooled to quickly reduce its temperature and fix the annealing effect. The cooling method can be natural cooling or forced cooling (such as water cooling, air cooling, etc.), and the specific method is selected according to production efficiency and equipment conditions. During the cooling process, the wire should be protected from rapid temperature changes to prevent new internal stress. The annealed wire needs to be inspected for quality, including appearance inspection, resistivity test, flexibility test, etc., to ensure that it meets the requirements of subsequent enameling and use. Unqualified wires need to be reworked or scrapped in a timely manner.

[0027] During the above period, high-precision temperature sensors (such as thermocouples or infrared thermometers) can be used to monitor the temperature of each zone of the annealing furnace in real time, and the power of the heating element can be accurately adjusted through the PID control system to keep the temperature stable. The temperature fluctuation in the annealing zone should be controlled within ±5°C to ensure the stability of the annealing quality. And the line speed needs to be adjusted according to the length and temperature setting of the annealing furnace to ensure that the copper wire stays in the annealing furnace for a sufficient time for sufficient annealing. The general line speed is between tens of meters and hundreds of meters per minute.

[0028] S3, Surface treatment: After the annealing process, in order to ensure the final quality of the enameled wire, the wire needs to undergo a series of fine surface treatments. The key to this stage is to change the physical state of the wire surface through specific environmental conditions to create ideal adhesion conditions for the subsequent painting step. The following is a detailed operation process of this step and the optimization strategy of its technical parameters:

[0029] First, the wire is frozen to reduce the wire temperature, shrink the tiny pores on the wire surface, and remove trace grease or impurities that may remain on the surface, creating a clean foundation for the subsequent formation of water droplets. In specific operations, the annealed wire is quickly transferred to the freezer, and liquid nitrogen or a low-temperature cooling system is used to reduce the wire temperature to close to but not lower than its brittle point, generally controlled between -30°C and -50°C, for about 5-10 minutes. During this process, it is necessary to ensure that the wire is cooled evenly to avoid changes in material properties caused by local temperature differences. The above freezing treatment can not only effectively clean the surface, but also form a thin and uniform layer of ice crystals on the wire surface by rapidly cooling, providing a basis for the subsequent uniform distribution of water droplets.

[0030] After that, the frozen wire is immediately moved to a precisely controlled high humidity and high temperature environment. The ambient humidity should be maintained at 90%-95%, and the temperature should be controlled at 40℃-50℃. In such an environment, the ice crystals on the surface of the wire quickly melt and transform into small, evenly distributed water droplets, and the moisture in the ambient air also liquefies into small water droplets attached to the outer surface of the wire when it is cooled. The formation of water droplets needs to be continuously monitored to ensure that the entire surface of the wire is completely covered without missing any areas. Depending on the wire specifications and environmental conditions, this process takes about 10-20 minutes until a stable layer of water droplets is formed on the surface of the wire. Precise control of humidity and temperature is key. Too high a temperature may cause the water droplets to evaporate quickly, while too low a humidity will not form enough water droplets. Therefore, by installing high-precision temperature and humidity sensors and automatic control systems, environmental parameters can be monitored and adjusted in real time to ensure the best results.

[0031] In the above process, the wettability of the wire surface can be increased by freezing the wire after annealing and covering its surface with water droplets in a high humidity and high temperature environment. When the wet wire enters the painting step, the paint liquid can adhere to the wire surface more evenly to form a smoother and continuous paint film. When the wire surface evenly covered with water droplets is painted, the paint liquid can avoid the flow, aggregation or loss caused by uneven surface tension, thereby ensuring the thickness and uniformity of the paint film. This helps to improve the electrical and mechanical properties of the enameled wire, such as insulation resistance, tensile strength and wear resistance. This step also provides a more stable surface condition for the subsequent painting process, and the stable surface state provides a predictable basis for the painting process, so that key parameters such as the rotation speed of the painting wheel and the flow rate of the paint liquid can be more accurately controlled, thereby improving the automation of the production line and the consistency of product quality. In addition, by pre-treating the wire surface, paint defects such as bubbles, cracks or peeling caused by surface contamination, oxidation or grease residue can be reduced. This helps to improve the product qualification rate and reduce production costs. Therefore, the surface treatment step of freezing the wire and making its surface evenly covered with water droplets in a high humidity and high temperature environment is a key link in improving the manufacturing quality and production efficiency of the enameled wire.

[0032] S4. Painting: First, before painting, the painting equipment needs to be fully inspected and prepared. Make sure that key components such as the paint wheel, paint tank, and paint liquid filtration system are clean and free of impurities to avoid introducing pollutants during the painting process. At the same time, select the appropriate paint liquid type and concentration according to the specifications and performance requirements of the enameled wire. For automotive seat heating enameled wire, a paint liquid with high insulation, heat resistance, and wear resistance is usually selected to ensure that it can maintain stable performance during long-term use.

[0033] Next, set the parameters of the paint wheel. The paint wheel is a key component in the painting process, which is responsible for evenly coating the paint liquid on the surface of the wire. According to the diameter of the wire and the required paint film thickness, the speed, pressure and contact angle of the paint wheel with the wire are precisely adjusted. Generally speaking, the speed of the paint wheel should be controlled between a few hundred and a few thousand revolutions per minute, and the specific value needs to be determined according to the production speed and the characteristics of the paint liquid. The pressure should be adjusted according to the material of the wire and the viscosity of the paint liquid to ensure that the paint liquid can fully penetrate and adhere to the surface of the wire. The contact angle should be optimized according to the shape of the paint wheel and the movement trajectory of the wire to achieve the best painting effect.

[0034] During the painting process, the flow rate and temperature of the paint liquid are also crucial parameters. Too much flow rate may lead to too thick a paint film, affecting the electrical and mechanical properties of the enameled wire; too little flow rate may lead to incomplete paint film, missing coating or thin coating. Therefore, it is necessary to accurately control the flow rate of the paint liquid according to the specifications of the wire and the production speed. Generally speaking, the flow rate of the paint liquid should be controlled between a few milliliters and tens of milliliters per minute. At the same time, the temperature of the paint liquid also needs to be strictly controlled to avoid affecting the fluidity and curing effect of the paint liquid due to too high or too low temperature. Generally, the temperature of the paint liquid should be kept in the range of room temperature to slightly above room temperature, and the specific value needs to be determined according to the characteristics of the paint liquid and production requirements.

[0035] In order to ensure the uniformity and stability of the painting, some advanced painting technologies can also be used. For example, the use of ultrasonic assisted painting technology can make use of the vibration of ultrasound to make the paint liquid adhere to the surface of the wire more evenly, thereby improving the efficiency and quality of painting. In addition, the use of multi-wheel painting technology can also further improve the uniformity of painting and the thickness control accuracy. Through the synergistic effect of multiple painting wheels, multiple coatings and trimmings of the wire surface can be achieved, thereby obtaining a more ideal paint film effect.

[0036] S5. Drying and cooling: Choose an energy-efficient drying furnace. The furnace material should have good high temperature resistance and heat preservation performance, such as stainless steel or high temperature resistant alloy materials, to ensure temperature stability and uniformity during the drying process. The drying furnace is best equipped with an accurate temperature control system, such as a PID temperature controller, to achieve accurate temperature regulation and stable control. The drying furnace is best equipped with evenly distributed heating elements and ventilation systems to ensure uniform temperature in the furnace. Multiple temperature sensors and fans can be installed to achieve real-time monitoring and uniform distribution of temperature.

[0037] According to the characteristics of the paint liquid and production requirements, set the appropriate drying temperature. Generally speaking, the drying temperature should be higher than the curing temperature of the paint liquid, but lower than the melting point of the wire. For commonly used paint liquids, the drying temperature is usually controlled between 450℃ and 250℃. The drying time needs to be appropriately adjusted according to the paint film thickness, wire specifications and drying temperature. Too short drying time may cause the paint film to not be completely cured, while too long drying time may cause the paint film to age or the performance of the wire to deteriorate. Therefore, it is necessary to determine the best drying time through experiments, which is generally controlled to range from a few minutes to tens of minutes. During the drying process, the enameled wire needs to be turned or rotated regularly to avoid uneven paint film or cracking due to local overheating.

[0038] After drying, the enameled wire needs to be inspected for appearance to ensure that the paint film is smooth, free of cracks, bubbles and other defects, and the paint film adhesion test is carried out, such as using the twist stripping method or the stretching method, to test the bonding strength between the paint film and the wire.

[0039] For the enameled wire that has been dried, it is necessary to select an appropriate cooling method based on production efficiency and equipment conditions. Natural cooling is suitable for small-scale production or occasions where the cooling speed is not required; forced cooling (such as water cooling, air cooling, etc.) is suitable for large-scale production or occasions where the cooling speed is required. The cooling speed should be moderate to avoid excessive cooling speed causing cracking of the paint film or stress inside the wire. The cooling speed can be controlled by adjusting the flow rate, temperature or cooling time of the cooling medium. The cooling temperature should be gradually reduced to room temperature or slightly below room temperature to ensure that the paint film is completely cured and to avoid performance degradation caused by rapid temperature changes. After cooling is completed, the enameled wire needs to be inspected again to ensure that the paint film is intact, crack-free, and without shedding. Finally, electrical performance tests, such as insulation resistance test and voltage withstand test, are carried out to check whether the electrical performance of the enameled wire meets the use requirements.

[0040] S6. Wire taking-up: Select a suitable wire taking-up machine according to the specifications (diameter, material) and production speed of the enameled wire. For large diameter or high hardness enameled wire, a disc-type wire taking-up machine with strong tension control capability is used; for small or soft enameled wire, a drum or barrel-type wire taking-up machine is more suitable to reduce pressure damage to the wire. The surface of the turntable or drum of the wire taking-up machine should be smooth and without edges, and the material should have a certain degree of elasticity, such as using rubber or special plastic coating to prevent scratches on the surface of the enameled wire during the wire taking-up process.

[0041] During the wire-winding process, it is necessary to keep synchronization with the previous process of the production line (such as drying and cooling) to avoid wire accumulation or stretching caused by speed mismatch. It is generally set according to the overall beat of the production line and the characteristics of the enameled wire to ensure that the wire remains stable and continuous during the wire-winding process. And based on the diameter, material and required packaging tightness of the enameled wire, the wire-winding tension is accurately set. Too little tension can easily lead to loose wire coils and increase the risk of damage during transportation and storage; too much tension may crush the wire and affect electrical performance and appearance. Usually, the wire-winding tension should be controlled within 10%-15% of the non-extension tension of the enameled wire.

[0042] It is best to implement online monitoring during the winding process, using cameras or sensors to check the arrangement of the wire during the winding process, and promptly detect and correct any deflection or disorder. It is also necessary to regularly check the surface of the turntable or drum of the winding machine to ensure that it is clean and free of foreign matter to avoid contamination or damage to the enameled wire. Finally, the appearance of the wound wire coil is inspected to confirm that the shape of the wire coil is regular, not loose, and without indentations, and the necessary dimensional measurements and weight checks are performed to ensure that it meets product specifications.

[0043] Taking actual production as an example, a soft copper wire with a diameter of 1mm is used as the conductor material to manufacture an enameled wire for a car seat heating system:

[0044] 1. Production preparation

[0045] Raw material preparation: Select soft copper wire with a diameter of 1mm as the conductor material, and ensure that its resistivity, softness and tensile strength meet the production requirements.

[0046] Equipment preparation:

[0047] Wire-releasing device: Choose the over-the-end wire-releasing device, which is suitable for the wire-releasing needs of medium-sized conductors.

[0048] Annealing furnace: A continuous annealing furnace is used, the furnace body material is a high temperature resistant alloy, and the length of the annealing zone is set to 10 meters.

[0049] Freezing equipment: Prepare a liquid nitrogen freezing system for freezing the wires.

[0050] High humidity and high temperature environment box: set the humidity to 95% and the temperature to 45℃, used for the formation of water droplets on the surface of the wire.

[0051] Painting equipment: Use precision painting machine equipped with ultrasonic assisted painting technology.

[0052] Drying furnace: Use high-efficiency and energy-saving drying furnace, equipped with PID temperature controller, and the drying temperature is set at 200℃.

[0053] Wire take-up machine: Choose a drum wire take-up machine, and control the wire take-up tension at 12% of the non-extension tension of the enameled wire.

[0054] Paint liquid preparation: Select paint liquid with high insulation, heat resistance and wear resistance, and adjust it to the appropriate concentration according to production requirements.

[0055] 2. Production Process

[0056] Paying off: Install the copper wire reel on the over-end pay-off device and set the pay-off tension to 3kg / mm 2 , ensuring that the copper wire remains stable and does not jump during the pay-off process.

[0057] Annealing: The copper wire is sent to the annealing furnace for preheating, annealing and cooling. The temperature of the annealing zone is controlled at 500℃, and nitrogen is introduced as a protective gas to prevent oxidation of the copper wire. After annealing, the surface of the copper wire is bright and soft.

[0058] Surface treatment: The annealed copper wire is quickly moved to the freezer, and the temperature of the copper wire is lowered to -40°C using liquid nitrogen for 8 minutes. Then the copper wire is moved to a high humidity and high temperature environment box, and the humidity is maintained at 95% and the temperature is maintained at 45°C for 15 minutes, so that the surface of the copper wire is evenly covered with water droplets.

[0059] Painting: The treated copper wire is fed into the painting equipment, and the paint liquid is evenly coated on the surface of the copper wire using ultrasonic assisted painting technology. The flow rate and temperature of the paint liquid are controlled to ensure that the paint film thickness is uniform and free of defects.

[0060] Drying and cooling: The painted copper wire is sent to the drying furnace for drying. The drying temperature is set to 500℃ for 20 minutes. After drying, the copper wire is naturally cooled to room temperature.

[0061] Wire Rewinding: Use a drum wire rewinding machine to rewind the dried and cooled enameled wire, and set the wire rewinding tension to 12% of the non-stretching tension of the enameled wire. Keep the wire coil tight and free of looseness during the wire rewinding process.

[0062] 3. Quality Inspection

[0063] Appearance inspection: Carry out appearance inspection on the collected enameled wire to ensure that the paint film is smooth and free of defects such as cracks and bubbles.

[0064] Electrical performance test: Conduct insulation resistance test, voltage withstand test and other electrical performance tests to ensure that the electrical performance of the enameled wire meets the use requirements.

[0065] Mechanical performance test: Conduct tensile strength test, wear resistance test and other mechanical performance tests to ensure that the mechanical properties of the enameled wire meet the standards.

[0066] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A method for manufacturing a heating enameled wire for a car seat, characterized in that: The following steps are involved: S1. Paying off: Select the pay-off device according to the specifications of the enameled wire and production requirements, and set the pay-off tension; S2, Annealing: preheating, annealing and cooling the wire, while introducing steam to prevent oxidation; S3, surface treatment: freeze the annealed wire and make its surface covered with water droplets in a high humidity and high temperature environment; S4, painting: Use painting equipment to evenly coat the paint liquid on the surface of the wire, and control the flow rate and temperature of the paint liquid; S5, drying and cooling: drying the painted wire in a drying furnace, and then cooling to room temperature; S6. Wire taking-up: Use the wire taking-up machine to reel up the dried and cooled enameled wire and set the wire taking-up tension.

2. The method for manufacturing the automobile seat heating enameled wire according to claim 1, characterized in that: In step S1, the pay-off device includes a radial rotary pay-off, an over-the-end or brush pay-off, a brush or double-cone sleeve pay-off.

3. The method for manufacturing the automobile seat heating enameled wire according to claim 1, characterized in that: In step S2, the temperature of the annealing zone is controlled at 400°C-550°C.

4. The method for manufacturing the automobile seat heating enameled wire according to claim 1, characterized in that: In step S3, the temperature of the freezing treatment is controlled between -30°C and -50°C for 5-10 minutes, the humidity of the high humidity and high temperature environment is maintained at 90%-95%, and the temperature is controlled at 40°C-50°C.

5. The method for manufacturing the automobile seat heating enameled wire according to claim 1, characterized in that: In step S5, the drying temperature is controlled between 450°C and 250°C.

6. The method for manufacturing the automobile seat heating enameled wire according to claim 1, characterized in that: In step S6, the wire take-up machine includes a disk-type wire take-up machine, a drum-type wire take-up machine or a barrel-type wire take-up machine, and the wire take-up tension is controlled within a range of 10%-15% of the non-extension tension of the enameled wire.