Wire drawing process of high-strength aluminum conductor

Abstract

The invention relates to a wire drawing process of a high-strength aluminum conductor, belongs to the technical field of metal material processing, in particular to the technical field of metal material processing of a new energy electric automobile, and aims at 1-series aluminum and 6-series aluminum conductors, the 1-series aluminum and 6-series aluminum conductors are drawn from 11 mm bars to 0.20 mm wires, and the 0.20 mm wires are drawn from 11 mm bars to 0.20 mm wires. The wire drawing process of the high-strength aluminum conductor comprises the process steps of S1, raw material preparation and pretreatment, S2, primary wire drawing, S3, intermediate annealing treatment, S4, multiple times of wire drawing and S5, final wire drawing. Through the innovative design thought, the fine process steps, the remarkable process advantages and the unique process innovation, many problems existing when 1-series aluminum and 6-series aluminum conductors are treated through an existing wire drawing process are effectively solved, powerful technical support is provided for wide application of the aluminum conductors in the high-end industrial field, and the method is worthy of popularization and application. The wire drawing process of the high-strength aluminum conductor can effectively reduce the weight of the new energy automobile, and has a great improvement effect on the development of the new energy automobile.

Description

Technical Field

[0001] The invention belongs to the technical field of metal material processing, in particular to the technical field of metal material processing of new energy electric vehicles, and specifically relates to a wire drawing process for a high-strength aluminum conductor. Background Art

[0002] In the modern industrial system, metal processing is of vital importance. Aluminum conductors are key conductive materials, and their processing technology affects many industries. Wire drawing is the key link in stretching aluminum bars into wires of specific sizes. With the rapid development of the industry, aluminum conductors are widely used due to their many advantages. They have low density, can reduce the weight of components, and are favored in industries such as aerospace and automobiles; they have excellent electrical conductivity and are indispensable in the fields of power transmission and electronic equipment manufacturing. 1 series aluminum has high purity, excellent electrical conductivity and thermal conductivity, and is used in high-voltage power transmission and high-precision electronic component manufacturing. After adding alloy elements, 6 series aluminum has improved strength and better machinability, and is widely used in the manufacture of components that need to withstand mechanical loads and have shape processing requirements.

[0003] However, when drawing 1 series aluminum and 6 series aluminum conductors from 11mm rods into 0.20mm wires, there are many problems with the traditional wire drawing process. First, aluminum is relatively soft and is prone to surface scratches and other defects, which affect the appearance and performance. Second, the residual stress generated by wire drawing makes the internal structure of the wire uneven and affects the mechanical properties. Third, the traditional process lacks precision and systematicity in wire drawing speed, die selection, lubrication and cooling, which can easily lead to wire breakage, increased die wear and excessive wire temperature. Fourth, the material property differences between 1 series aluminum and 6 series aluminum are not fully considered, and unified processing parameters are used, which limits the improvement of wire product quality. Therefore, it is urgent to innovate the wire drawing process to meet the needs of modern industry for high-quality and high-strength aluminum conductor wires. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides a wire drawing process for high-strength aluminum conductors. Through innovative design ideas, sophisticated process steps, significant process advantages and unique process innovations, the present invention effectively solves many problems existing in the existing wire drawing process when processing 1 series aluminum and 6 series aluminum conductors, and provides strong technical support for the widespread application of aluminum conductors in high-end industrial fields.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a wire drawing process for a high-strength aluminum conductor, the wire drawing process for the high-strength aluminum conductor is for 1 series aluminum and 6 series aluminum conductors, and the 1 series aluminum and 6 series aluminum conductors are drawn from 11 mm rods into 0.20 mm wires. The process steps of the wire drawing process for the high-strength aluminum conductor are as follows:

[0008] S1: Raw material preparation and pretreatment. During the raw material preparation process, 11mm bars of 1 series aluminum or 6 series aluminum that meet specific quality standards are strictly selected, and then the surface is cleaned. A composite cleaning method is used. First, a special chemical cleaning agent is soaked at a specific temperature (50-60°C) for 15-20 minutes to remove impurities such as oil stains, and then fine mechanical grinding is used to further remove the oxide scale to ensure that the surface of the bar is smooth. After the surface is cleaned, a preheating temperature of 300-350°C is set for 1 series aluminum bars for 2-3 hours, and a preheating temperature of 350-400°C is used for 6 series aluminum bars for the same 2-3 hours to effectively eliminate internal residual stress;

[0009] S2: For the first wire drawing, high-precision carbide wire drawing dies are selected, the hardness of the working area reaches HRC62-65, and the surface roughness Ra is controlled at 0.1-0.2μm. The pre-treated rods are sent to the wire drawing machine and drawn at a speed of 50-80m / min. At the same time, special wire drawing oil is used for lubrication and cooling. The oil temperature is maintained at 40-50℃, and the rods are drawn to a diameter of 8-9mm.

[0010] S3: Intermediate annealing treatment, annealing setting, annealing temperature of 1 series aluminum wire is 250-300℃, annealing time is 1-2 hours; 6 series aluminum wire is 300-350℃, 1-2 hours, eliminate drawing stress, optimize internal structure, and then cool down naturally to room temperature to avoid new stress;

[0011] S4: Multiple wire drawing. During the multiple wire drawing process, the parameters need to be adjusted. As the wire diameter decreases, the wire drawing speed is gradually reduced, such as 40-60m / min for the second wire drawing and 30-50m / min for the third wire drawing. At the same time, the wire drawing oil temperature is reduced accordingly, and the wire diameter is gradually pulled to 1-2mm.

[0012] S5: For the final drawing, a higher precision die (HRC64-66, Ra 0.05-0.08μm) is selected, the wire is drawn at a speed of 10-20m / min, the oil temperature is 30-40℃, and the finished wire is drawn into 0.20mm.

[0013] Preferably, in the wire drawing process of the high-strength aluminum conductor, online inspection is required immediately after the initial wire drawing to check the diameter deviation, surface roughness and defects, and the parameters are adjusted if they do not meet the requirements.

[0014] Preferably, in the wire drawing process of the high-strength aluminum conductor, a comprehensive inspection is performed after each wire drawing process during multiple wire drawing processes, with a focus on the uniformity of the internal organizational structure, and timely adjustments are made when problems are found.

[0015] Preferably, in the wire drawing process of the high-strength aluminum conductor, after the final wire drawing step is completed, the finished wire material needs to be fully tested, including tensile strength, yield strength, electrical conductivity, surface quality, etc., to ensure that it meets the quality requirements of the high-strength aluminum conductor. After all requirements are met, it is packaged and stored using high-quality packaging materials.

[0016] (III) Beneficial effects

[0017] The present invention provides a wire drawing process for a high-strength aluminum conductor, which has the following beneficial effects:

[0018] 1. The present invention provides a wire drawing process for high-strength aluminum conductors. Through fine pretreatment, precise wire drawing control and strict testing process, the prepared wire has high strength, excellent surface quality and uniform internal structure, which can perfectly meet the high standards of high-end industrial applications for aluminum conductor materials. At the same time, reasonable process parameter settings effectively reduce wire breakage and other faults, improve production stability, and thus improve overall production efficiency, meet the needs of large-scale industrial production, and can be applied to 1 series aluminum and 6 series aluminum conductors at the same time. The personalized process parameter design for different material characteristics enables it to show excellent performance in different aluminum conductor wire drawing processes.

[0019] 2. The present invention provides a wire drawing process for high-strength aluminum conductors, which has personalized pretreatment innovation. According to the differences in the chemical and physical properties of 1 series aluminum and 6 series aluminum, different preheating temperatures and times are tailored. This personalized pretreatment method optimizes the material processability from the source, laying a solid foundation for subsequent high-quality wire drawing. At the same time, it has a dynamic parameter control mechanism. During the wire drawing process, as the wire diameter changes, the wire drawing speed, wire drawing oil temperature and other key parameters are dynamically adjusted. This real-time dynamic control can accurately match the processing requirements of the wire at different stages, effectively avoid quality problems caused by unsuitable processing conditions, greatly improve the stability of the wire quality, and has a strengthened detection feedback system. The online detection links of multiple key nodes are set, which can not only monitor the conventional quality indicators of the wire in real time, such as diameter deviation, surface roughness, etc., but also deeply detect the uniformity of the internal organizational structure. At the same time, a fast and effective feedback mechanism is established. Once a quality problem is detected, the process parameters can be adjusted immediately to ensure that the entire wire drawing process is always in the optimal state, thereby ensuring the high-quality output of the finished wire.

[0020] 3. The present invention provides a wire drawing process for high-strength aluminum conductors. Through innovative design ideas, sophisticated process steps, significant process advantages and unique process innovations, it effectively solves many problems existing in the existing wire drawing process when processing 1 series aluminum and 6 series aluminum conductors, and provides strong technical support for the widespread application of aluminum conductors in high-end industrial fields.

[0021] 4. The present invention provides a wire drawing process for high-strength aluminum conductors, which plays a positive role in promoting the development of new energy vehicles, can effectively reduce the weight of the vehicle, optimize the design layout of new energy vehicles, and at the same time reduce the raw material cost of the vehicle, thereby reducing costs and increasing efficiency. At the same time, the wire drawing process can refine the grains of the aluminum conductor, increase its strength and toughness, and make the overall strength of the new energy vehicle higher. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In the description of this application, it should be noted that the terms used here are only for describing specific implementation methods, and are not intended to limit the exemplary implementation methods according to the present application. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0023] Embodiment 1:

[0024] The embodiment of the present invention provides a wire drawing process for high-strength aluminum conductors. The design concept of the process revolves around precise control, personalized processing, and full-process quality assurance. First, the different material properties of 1 series aluminum and 6 series aluminum are fully considered, and a pretreatment process is tailored for them, aiming to optimize the initial state of the material and improve machinability. Secondly, in the wire drawing process, by finely regulating the mold parameters, wire drawing speed, lubrication and cooling, etc., it is ensured that the wire can obtain suitable processing conditions at each wire drawing stage, thereby ensuring the stability and consistency of the wire quality. Finally, a complete detection and feedback mechanism is set up to monitor the wire quality in real time, so as to adjust the process parameters in time and realize the dynamic optimization of the wire drawing process.

[0025] The process steps of the wire drawing process of the high-strength aluminum conductor are:

[0026] S1: Raw material preparation and pretreatment. During the raw material preparation process, 11mm bars of 1 series aluminum or 6 series aluminum that meet specific quality standards are strictly selected, and then the surface is cleaned. A composite cleaning method is used. First, a special chemical cleaning agent is soaked at a specific temperature (50-60°C) for 15-20 minutes to remove impurities such as oil stains, and then fine mechanical grinding is used to further remove the oxide scale to ensure that the surface of the bar is smooth. After the surface is cleaned, a preheating temperature of 300-350°C is set for 1 series aluminum bars for 2-3 hours, and a preheating temperature of 350-400°C is used for 6 series aluminum bars for the same 2-3 hours to effectively eliminate internal residual stress;

[0027] S2: For the first wire drawing, high-precision carbide wire drawing dies are selected, the hardness of the working area reaches HRC62-65, and the surface roughness Ra is controlled at 0.1-0.2μm. The pre-treated rods are sent to the wire drawing machine and drawn at a speed of 50-80m / min. At the same time, special wire drawing oil is used for lubrication and cooling. The oil temperature is maintained at 40-50℃, and the rods are drawn to a diameter of 8-9mm.

[0028] S3: Intermediate annealing treatment, annealing setting, annealing temperature of 1 series aluminum wire is 250-300℃, annealing time is 1-2 hours; 6 series aluminum wire is 300-350℃, 1-2 hours, eliminate drawing stress, optimize internal structure, and then cool down naturally to room temperature to avoid new stress;

[0029] S4: Multiple wire drawing. During the multiple wire drawing process, the parameters need to be adjusted. As the wire diameter decreases, the wire drawing speed is gradually reduced, such as 40-60m / min for the second wire drawing and 30-50m / min for the third wire drawing. At the same time, the wire drawing oil temperature is reduced accordingly, and the wire diameter is gradually pulled to 1-2mm.

[0030] S5: Final wire drawing, using a higher precision die (HRC64-66, Ra 0.05-0.08μm), drawing at a speed of 10-20m / min, oil temperature 30-40℃, and drawing into a 0.20mm finished wire;

[0031] After the first wire drawing, online inspection is required immediately to check the diameter deviation, surface roughness and defects. If they do not meet the requirements, the parameters should be adjusted. During the multiple wire drawing processes, a comprehensive inspection is carried out after each wire drawing, focusing on the uniformity of the internal organizational structure. If problems are found, adjustments are made in time. After the final wire drawing step is completed, the finished wire needs to be fully inspected, including tensile strength, yield strength, conductivity, surface quality, etc., to ensure that it meets the quality requirements of high-strength aluminum conductors. After meeting the requirements, it is packaged and stored with high-quality packaging materials.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wire drawing process for a high-strength aluminum conductor, characterized in that: The wire drawing process of the high-strength aluminum conductor is for 1 series aluminum and 6 series aluminum conductors, and the 1 series aluminum and 6 series aluminum conductors are drawn from 11 mm rods into 0.20 mm wires. The process steps of the wire drawing process of the high-strength aluminum conductor are as follows: S1: Raw material preparation and pretreatment. During the raw material preparation process, 11mm bars of 1 series aluminum or 6 series aluminum that meet specific quality standards are strictly selected, and then the surface is cleaned. A composite cleaning method is used. First, a special chemical cleaning agent is soaked at a specific temperature (50-60°C) for 15-20 minutes to remove impurities such as oil stains, and then fine mechanical grinding is used to further remove the oxide scale to ensure that the surface of the bar is smooth. After the surface is cleaned, a preheating temperature of 300-350°C is set for 1 series aluminum bars for 2-3 hours, and a preheating temperature of 350-400°C is used for 6 series aluminum bars for the same 2-3 hours to effectively eliminate internal residual stress; S2: For the first wire drawing, high-precision carbide wire drawing dies are selected, the hardness of the working area reaches HRC62-65, and the surface roughness Ra is controlled at 0.1-0.2μm. The pre-treated rods are sent to the wire drawing machine and drawn at a speed of 50-80m / min. At the same time, special wire drawing oil is used for lubrication and cooling. The oil temperature is maintained at 40-50℃, and the rods are drawn to a diameter of 8-9mm. S3: Intermediate annealing treatment, annealing setting, annealing temperature of 1 series aluminum wire is 250-300℃, annealing time is 1-2 hours; 6 series aluminum wire is 300-350℃, 1-2 hours, eliminate drawing stress, optimize internal structure, and then cool down naturally to room temperature to avoid new stress; S4: Multiple wire drawing. During the multiple wire drawing process, the parameters need to be adjusted. As the wire diameter decreases, the wire drawing speed is gradually reduced, such as 40-60m / min for the second wire drawing and 30-50m / min for the third wire drawing. At the same time, the wire drawing oil temperature is reduced accordingly, and the wire diameter is gradually pulled to 1-2mm. S5: For the final drawing, a higher precision die (HRC64-66, Ra 0.05-0.08μm) is selected, the wire is drawn at a speed of 10-20m / min, the oil temperature is 30-40℃, and the finished wire is drawn into 0.20mm.

2. The wire drawing process of a high-strength aluminum conductor according to claim 1, characterized in that: In the wire drawing process of the high-strength aluminum conductor, online inspection is required immediately after the initial wire drawing to check the diameter deviation, surface roughness and defects. If they do not meet the requirements, the parameters are adjusted.

3. The wire drawing process of a high-strength aluminum conductor according to claim 1, characterized in that: In the wire drawing process of this high-strength aluminum conductor, a comprehensive inspection is carried out after each drawing process during multiple drawing processes, focusing on the uniformity of the internal organizational structure and making timely adjustments when problems are found.

4. The wire drawing process of a high-strength aluminum conductor according to claim 1, characterized in that: In the wire drawing process of the high-strength aluminum conductor, after the final wire drawing step is completed, the finished wire needs to be fully tested, including tensile strength, yield strength, conductivity, surface quality, etc., to ensure that it meets the quality requirements of high-strength aluminum conductors. After meeting the requirements, it is packaged and stored with high-quality packaging materials.