Heat treatment method and device for conductive cable

Abstract

The invention relates to a heat treatment method of a conductive cable, which comprises the following steps of: spirally winding the cable on a first barrel, and insulating the part, wound with the cable, of the first barrel; and the first barrel is heated and rotated, so that the cable wound on the first barrel is conveyed while being heated by the first barrel. The device comprises a cylinder assembly, a heat preservation box body and a heating part, the cylinder assembly comprises a first cylinder body, and a winding part is formed on the periphery of the first cylinder body and can rotate around the axis of the first cylinder body; the heat preservation box at least sleeves the winding part, and the heating component is arranged in the first barrel. The temperature uniformity can be improved, the stability of the heat treatment process is guaranteed, and then the product performance stability is improved; the heating efficiency and the production efficiency are greatly improved; the temperature range and the temperature precision are improved, the heat energy utilization rate is high, various heat treatment functions such as solid solution, homogenization, annealing, aging and quenching can be achieved, the device can be matched with a production line and can also be independently used off line, and multiple purposes are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum alloy material processing, and in particular relates to a heat treatment method and device for a conductive cable. Background Art

[0002] Aluminum and aluminum alloys have high specific strength, good corrosion resistance and excellent electrical conductivity, and are widely used in the wire and cable industry. Compared with traditional copper wires and cables, aluminum alloy wires and cables (hereinafter referred to as aluminum poles and cables) have the advantages of light weight, high transmission capacity and low price. They are widely used in power transmission and distribution, building electrical, mechanical equipment, communications and automation systems. In recent years, with the rise of new industries such as wind farms and pure electric vehicles, the demand for the application of aluminum poles and cables is very strong. At present, various industries are constantly refining and improving the performance indicators of aluminum poles and cables, and at the same time, they also put forward higher requirements for the stability of cable product performance.

[0003] Heat treatment is very important for improving the performance of aluminum poles and wires. Appropriate heat treatment processes (solid solution, homogenization, annealing, aging, etc.) can effectively improve the mechanical strength, fatigue life, creep strength and electrical properties of aluminum poles and wires. For example, homogenization heat treatment can solve the fatigue fracture of aluminum alloy core aluminum stranded wires caused by the segregation of alloy elements to form magnesium-silicon brittleness; quenching, aging and other heat treatment methods for aluminum alloy rods can solve the problem of easy fatigue and creep; and aging treatment after solid solution treatment can significantly improve the conductivity and electrical properties of aluminum alloy conductors.

[0004] At present, the mass production heat treatment equipment for aluminum rods and wires in the industry is mostly batch-type, special heat treatment equipment in the form of box-type heating furnaces. After a batch of aluminum rods and wires are arranged in the form of coils and stacked and loaded into the heating furnace for heat treatment, they can be taken out before the next batch of heat treatment can be carried out. This type of heat treatment equipment has the following problems: First, the equipment is limited by heating capacity and temperature control accuracy, and can only achieve 1-2 heat treatment methods within a certain temperature range, and cannot achieve multiple heat treatment processes. For example, the aging furnace and annealing furnace have a temperature upper limit generally below 250°C and 400°C, and cannot perform solid solution and homogenization heat treatment (generally 450-600°C); second, the heat source and the aluminum rod wire rely on hot air for heat transfer, with low heat exchange efficiency and slow heating speed. For example, the heating process time in a common 10T furnace takes 3-5 hours; third, the heat source is located on one side of the furnace body, and the aluminum rod wires are at different distances from the heat source in space, so different positions The heating temperature is uneven. There are great differences in the heating speed, temperature reaching time and insulation time of the aluminum rod wires coiled at different positions in the furnace, the inside and outside of the same coil, and the far and near ends. In the common box-type heating furnace, the time difference in reaching the set temperature of the aluminum rod wires close to the heat source and far away from the heat source can reach tens of minutes. There are differences in the performance of various parts after heat treatment, and batch stability cannot be achieved; Fourth, the existing heating furnace can only be taken out of the furnace for air cooling after the heating is completed. The cooling speed is weak. Aluminum materials that require cooling intensity need to be transferred out of the furnace to a special quenching device. The transfer time is long, and the material has been reduced to below the temperature required by the process, and effective cooling cannot be achieved.

[0005] For example, the patent with publication number CN216347774U discloses a heating and insulation furnace for producing electrical round aluminum rods. A reinforcement net is arranged on the outer surface of the insulation furnace. The reinforcement net improves the stability of the aluminum-melting insulation furnace. A number of grids are formed between the reinforcement nets. Each grid is provided with an insulation layer. The heat loss of the aluminum-melting insulation furnace is reduced and the heat utilization rate is improved. Although the heat loss is reduced, there are still problems such as single heat treatment function, uneven temperature and slow heating speed. Summary of the invention

[0006] An object of the present invention is to provide a method for heat treatment of a conductive cable, such as heat treatment of a conductive aluminum rod wire.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A heat treatment method for a conductive cable comprises spirally winding the cable on a first cylinder and keeping at least the portion of the first cylinder on which the cable is wound warm; rotating the first cylinder while heating the first cylinder so that the cable wound on the first cylinder is transported while being heated by the first cylinder.

[0009] In the above technical solution, preferably, the cable is cooled immediately after being heated by the first cylinder, and the cooling method includes air cooling and / or water cooling, which can reduce the transfer time of quenching.

[0010] Preferably, in the above technical solution, the heating component is arranged inside the first cylinder, and the cable is heated by heat conduction and radiation of the first cylinder, thereby achieving the purpose of rapid and uniform heating.

[0011] The above technical solution is preferably based on the circumference C of a single winding of the cable, the number of windings N, the discharge speed V, the heating time T 升 , calculate the holding time T by the following formula 保 :

[0012] T 保 =N×C / VT 升 ,

[0013] The holding time is one of the key process parameters in the heat treatment method of cables. By controlling the number of cable windings and combining the feeding and discharging speeds, the holding time can be precisely controlled.

[0014] Another object of the present invention is to provide a heat treatment device for a conductive cable to achieve heat treatment process requirements with multiple functions.

[0015] In order to achieve the above object, the technical solution adopted by the present invention is:

[0016] A heat treatment device for a conductive cable, comprising:

[0017] Cylinder assembly: The cylinder assembly comprises a first cylinder, the outer periphery of which forms a winding portion for winding the cable, and the first cylinder can rotate around its own axis;

[0018] Insulation box: the insulation box is at least sleeved on the outside of the winding part and covers the winding part, and a feed inlet is opened on one side of the insulation box and a discharge outlet is opened on the other side;

[0019] Heating component: The heating component is arranged inside the first cylinder.

[0020] Preferably, in the above technical solution, the winding portion extends spirally along the axial direction of the first cylinder, and the spiral extension conveying method can effectively utilize the space in the heat preservation box.

[0021] Preferably, the above technical solution is such that the barrel assembly also includes a second barrel, which is fixedly sleeved on the outside of the first barrel, and the second barrel is provided with a groove penetrating through its barrel wall, and the groove extends in an axial spiral along the second barrel, and the side walls of the groove and the outer periphery of the first barrel jointly form the winding portion, and the width and depth dimensions of the groove are adapted to the diameter of the cable.

[0022] Further preferably, the device further comprises a fixing seat, and both ends of the second cylinder extend out of the heat preservation box and are supported on the fixing seat.

[0023] Preferably, in the above technical solution, the device further comprises a cooling component, which is arranged at the discharge port, and a plurality of groups are arranged along the conveying direction of the cable, and / or the cooling component is arranged on the upper and lower sides of the cable output line, so that the cable can be cooled immediately after being discharged, thereby reducing the transfer time of quenching.

[0024] Further preferably, the cooling assembly comprises a first tube body and / or a second tube body, the first tube body and the second tube body are connected to a water source and / or an air source, the outlets of the first tube body and the second tube body face the cable, and the cooling mode can be controlled individually or in combination of the two modes (water cooling and air cooling).

[0025] More preferably, the second tube body extends into the first tube body, and the outlet of the second tube body is located inside the first tube body, and air cooling and thermal cooling can be performed to cool the cable through the outlet of one tube body.

[0026] Preferably, in the above technical solution, the heating component is located at least inside the first cylinder of the winding portion, and the heating component is closer to the winding position of the cable, so as to facilitate accurate control of the heating temperature.

[0027] Preferably, the above technical solution is such that the device further comprises a driving component, a feed controller and a traction component; the driving component cooperates with the first cylinder to drive the first cylinder to rotate; the feed controller is arranged upstream of the feed port to assist in the transportation of the cable; the traction component is arranged downstream of the discharge port to pull the cable for transportation; the feed controller, the driving component and the traction component cooperate together to realize the transportation of the cable.

[0028] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0029] 1. By heating a single cable, compared with traditional coiled wire heating, the temperature uniformity can be greatly improved, the stability of the heat treatment process can be guaranteed, and the stability of product performance can be improved;

[0030] 2. Using contact heat transfer to heat the cable can greatly improve heating efficiency and production efficiency;

[0031] 3. The heating component is built into the first cylinder, which greatly improves the temperature range and temperature accuracy, and has a high thermal energy utilization rate. Together with the cooling component near the outlet, it can achieve a variety of heat treatment functions such as solid solution, homogenization, annealing, aging and quenching. It can be used in conjunction with the production line to achieve online heat treatment, or it can be used offline alone, achieving multiple uses of one machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Attached Figure 1 is a schematic diagram of the appearance of the device of the present invention;

[0033] Attached Figure 2 is a schematic cross-sectional view of the device of the present invention;

[0034] Attached Figure 3 It is a partial cross-sectional schematic diagram of the winding part in the present invention;

[0035] Attached Figure 4 It is a schematic diagram of the structure of the cooling assembly in the present invention;

[0036] Attached Figure 5 This is a schematic diagram comparing the heating rate of the device of the present invention with that of a traditional heating furnace;

[0037] Attached Figure 6a This is the solid solution effect diagram of the traditional device;

[0038] Attached Figure 6b This is a diagram showing the solid solution effect of the device of the present invention.

[0039] In the above attached figure:

[0040] 10. first cylinder; 100. winding portion; 11. second cylinder; 110. tank;

[0041] 2. Driving components;

[0042] 3. Insulation box; 30. Feed inlet;

[0043] 4. Fixed seat;

[0044] 5. Heating components;

[0045] 6. Cooling assembly; 60. First tube body; 61. Second tube body; 62. Nozzle;

[0046] 7. Feed controller;

[0047] 8. Cables. DETAILED DESCRIPTION

[0048] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0050] like Figure 1 , 2 The heat treatment device of a conductive cable shown mainly includes a barrel assembly, a driving component 2, a heat preservation box 3, a fixing seat 4, a heating component 5, a cooling component 6, a feed controller 7, a traction component, etc. The following specifically introduces each assembly and component in detail:

[0051] The barrel assembly includes a first barrel 10, and the outer periphery of the first barrel 10 forms a winding portion 100 for winding the cable, and the winding portion 100 extends spirally along the axial direction of the first barrel 10, that is, the cable can be spirally wound on the winding portion 100, wherein: the winding portion 100 can be a certain section on the first barrel 10, or it can be a specific structure on the first barrel 10.

[0052] The first cylinder 10 can rotate around its own axis, and the driving component 2 cooperates with the first cylinder 10 to drive the first cylinder 10 to rotate. The driving component 2 drives the first cylinder 10 in any manner, for example, it can be driven by a motor, and the output shaft of the motor and the first cylinder 10 are respectively provided with gears, and the gears of the two are meshed, so that the motor-gear transmission-the rotation of the first cylinder 10, of course, other driving methods are also possible, which do not involve the invention of the present application, and will not be listed one by one here.

[0053] In a preferred embodiment of the present application: the barrel assembly further includes a second barrel 11, which is fixedly sleeved on the outside of the first barrel 10, that is, the second barrel 11 is immovable, and the first barrel 10 can rotate around its own axis in the second barrel 11. The second barrel 11 is provided with a groove 110 that penetrates its barrel wall, and the groove 110 extends spirally along the axial direction of the second barrel 11. The side wall of the groove 110 and the outer periphery of the first barrel 10 jointly form a winding portion 100, and the width and depth of the groove 110 are adapted to the diameter of the cable, such as Figure 3 In this way, the cable can be spirally wound around the first cylinder 10 along the slot 110 .

[0054] The insulation box body 3 is at least sleeved on the outside of the winding part 100 and covers the winding part 100 to achieve insulation. A feed port 30 is opened on one side of the insulation box body 3 and a discharge port (not shown in the figure) is opened on the other side. The cable enters the insulation box body 3 from the feed port 30, is wound around the first cylinder 10, and is output from the discharge port. Similarly, the spiral winding method of the winding part 100 can also effectively utilize the space in the insulation box body 3.

[0055] Both ends of the second cylinder 11 extend out of the heat preservation box 3 and are supported on the fixing seat 4 ; the portion of the first cylinder 10 that needs to cooperate with the driving component 2 needs to extend out of the first cylinder 11 .

[0056] The heating component 5 is disposed inside the first cylinder 10. Preferably, the heating component 5 is at least located inside the first cylinder 10 of the winding part 100. The heating component 5 is closer to the winding position of the cable, and can achieve precise control over a large temperature range. The heating component 5 can be electrically heated, such as a spiral heating wire. Of course, other heating methods are also possible. The heating component 5 itself does not involve the invention of the present application, and will not be listed one by one here.

[0057] The cooling component 6 is arranged at the discharge port, and multiple groups are arranged along the conveying direction of the cable, and / or the cooling component 6 is arranged on the upper and lower sides of the cable output line. Preferably, cooling components 6 are arranged on the upper and lower sides of the cable and multiple groups are also arranged along the conveying direction of the cable. The cable can be cooled immediately after being discharged, thereby reducing the transfer time of quenching.

[0058] In this embodiment: the cooling assembly 6 includes a first tube body 60 and / or a second tube body 61, the first tube body 60 and the second tube body 61 are connected to a water source and / or an air source, and the outlets of the first tube body 60 and the second tube body 61 face the cable. The cooling assembly 6 can be used alone or in combination of two methods (water cooling and air cooling). Preferably, the first tube body 60 and the second tube body 61 are provided at the same time, and water cooling is performed while air cooling is performed. In addition, adding a nozzle 62 at the outlet can also realize the spraying of water mist.

[0059] In a preferred embodiment of the present application: the second tube 61 extends into the first tube 60, and the outlet of the second tube 61 is located inside the first tube 60, such as Figure 4 Air cooling and energy cooling can be used to cool the cable through the outlet of the first tube body 60, making the structure of the cooling assembly 6 more compact.

[0060] The feed controller 7 is arranged upstream of the feed port 30 to assist in the transportation of the cables; the traction component (not shown in the figure) is arranged downstream of the discharge port to pull the cables for transportation. The feed controller 7, the driving component and the traction component cooperate with each other to realize the transportation of the cables.

[0061] The device of this embodiment has a fast heating speed, a wide temperature range (50-600°C), and a temperature control accuracy of ±2°C; it has various cooling methods and can meet the requirements of heat treatment processes with various functions.

[0062] The heat treatment method of this device is described in detail below:

[0063] The cable is input from the feed port 30 on one side of the heat preservation box 3 , wound in the groove 110 of the second cylinder 11 to form multiple turns around the second cylinder 11 , and finally output from the discharge port on the other side of the heat preservation box 3 .

[0064] In the heat preservation box 3, the first cylinder 10 is heated by the heating component 5, and the cable contacts the outer periphery of the first cylinder 10 for heat conduction and heat transfer. At the same time, the heating component 5 also performs heat radiation and heat transfer to the cable, and heats the cable quickly and evenly.

[0065] The first cylinder 10 is driven by the driving component 2 and cooperates with the traction component to realize the transportation of the cable.

[0066] After the cable is heated and output from the insulation box 3, it can be cooled by the cooling component 6. The cooling component 6 can select quantitative adjustment of various cooling methods such as water spraying, misting, blowing, natural cooling, etc. The cooling speed can also be set according to the heat treatment requirements, and finally the heat treatment is completed.

[0067] The key process parameters of the heat treatment process of the cable are the insulation temperature, insulation time and cooling method. When the device is used, the heating temperature is controlled by the heating component 5 by measuring the temperature of the winding part 100 in the insulation box 3; the insulation time is determined by the circumference C of the cable single winding, the number of windings N, the discharge speed V, the heating time T 升 , the insulation time T is calculated by the following formula 保 :

[0068] T 保 =N×C / VT 升 .

[0069] Embodiment 1:

[0070] The φ9.5mm 6201 alloy round aluminum rod wire is solution heat treated, and the heat treatment requires a solution process at 560℃.

[0071] This device is used, and the heating temperature of the insulation box is set to 560°C, the radial circumference of the first cylinder is 2m, the number of winding turns is 60, the discharge speed is 10m / min, the residence time in the insulation box is 12min, and after exiting the insulation box, all the first pipeline and the second pipeline are sprayed with water for cooling, the water volume of the nozzle is 10L / min, and the cooling rate is >1000°C / h.

[0072] Comparative Example 1:

[0073] The φ9.5mm 6201 alloy round aluminum rod wire is solution heat treated, and the heat treatment requires a solution process at 560℃.

[0074] A traditional box-type solid solution furnace is used to place the alloy round aluminum rod wire in the solid solution furnace in the form of a coil. The heating temperature of the solid solution furnace is set to 560°C, the heating time is 270 minutes, the insulation time is 10 minutes, and the cooling is completed in the solid solution furnace.

[0075] Evaluate the effect of heating and solid solution. The heating results are as follows: Figure 5 As shown, the heating rate of the heat treatment device of the present invention is very fast. It only takes 1-2 minutes to heat up to about 560°C, compared with 3-5 hours required by the traditional heating furnace. The solid solution effect is as follows Figure 6a , Figure 6b As shown in the figure, after the solution heat treatment, the second phase structure of the aluminum rod wire is completely dissolved back into the matrix, and the solid solution is sufficient.

[0076] T6 aging heat treatment was performed to measure its mechanical properties and electrical conductivity. The aging treatment results are shown in Table 1. Compared with the performance of aluminum rods without the device, the performance (tensile strength, elongation, and electrical conductivity) has been significantly improved.

[0077] Table 1: Comparison of heat treatment results of φ9.5mm 6201 aluminum alloy conductive aluminum rods and wires

[0078] Tensile strength MPa Elongation % Conductivity %IACS The present invention processes 6201 360 18 53.5 Traditional Processing 6201 320 15 52.3

[0079] Embodiment 2:

[0080] The φ2.0mm 8030 aluminum alloy wire is annealed and heat treated, and the annealing process requires 380℃.

[0081] The device is used and the heating temperature is set to 380°C, the radial circumference of the first cylinder is 3m, the number of winding turns is 200, the discharge speed is 10m / min, the insulation time in the insulation box is 60min, and air cooling is adopted after outputting the insulation box.

[0082] Comparative Example 2:

[0083] The φ2.0mm 8030 aluminum alloy wire is annealed and heat treated, and the annealing process requires 380℃.

[0084] A traditional box-type heating furnace is used to place the aluminum alloy wire in the form of a coil in the heating furnace, and the heating temperature is set to 380°C, the heating time is 210 minutes, the insulation time is 60 minutes, and the wire is taken out of the heating furnace and cooled naturally.

[0085] The strength and conductivity of the annealed conductive aluminum wire were measured, and repeated bending tests were performed. The results are shown in Table 2. The data were very stable after multiple measurements, and the conductivity reached 61.9% IACS, which was 1% IACS higher than the conductivity of the material obtained by the traditional heat treatment furnace. The tensile strength, elongation, and bending times were significantly improved.

[0086] Table 2: Comparison of heat treatment effects of 8030 aluminum alloy

[0087]

[0088] In addition, both Example 1 and Example 2 (solid solution and annealing) can be completed using the device of the present application, with one machine for multiple purposes; whereas existing solid solution and annealing both require the use of a dedicated furnace body (solid solution furnace, heating furnace), require multiple devices, and the heat treatment effect is not as good as that of the present application.

[0089] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat treatment method for a conductive cable, characterized in that: The method comprises spirally winding the cable on a first cylinder and keeping at least the portion of the first cylinder on which the cable is wound warm; heating the first cylinder and rotating the first cylinder at the same time, so that the cable wound on the first cylinder is transported while being heated by the first cylinder.

2. The heat treatment method for a conductive cable according to claim 1, characterized in that: The cable heated by the first cylinder is then cooled, and the cooling method includes air cooling and / or water cooling.

3. The heat treatment method of a conductive cable according to claim 1, characterized in that: The heating component is arranged inside the first cylinder, and the cable is heated by heat conduction and radiation of the first cylinder.

4. The heat treatment method for a conductive cable according to claim 1, characterized in that: The circumference C of a single cable winding, the number of windings N, the discharge speed V, and the heating time T 升 , calculate the holding time T by the following formula 保 : T 保 =N×C / V-T 升 。 5. A device for implementing the heat treatment method of a conductive cable according to any one of claims 1 to 4, characterized in that: include: Cylinder assembly: The cylinder assembly comprises a first cylinder, the outer periphery of which forms a winding portion for winding the cable, and the first cylinder can rotate around its own axis; Insulation box: the insulation box is at least sleeved on the outside of the winding part and covers the winding part, and a feed inlet is opened on one side of the insulation box and a discharge outlet is opened on the other side; Heating component: The heating component is arranged inside the first cylinder.

6. The device according to claim 5, characterized in that: The winding portion spirally extends along the axial direction of the first cylinder.

7. The device according to claim 5 or 6, characterized in that: The barrel assembly also includes a second barrel, which is fixedly sleeved on the outside of the first barrel, and the second barrel is provided with a groove that penetrates its barrel wall, and the groove extends in an axial spiral along the second barrel, and the side wall of the groove and the outer periphery of the first barrel together form the winding portion.

8. The device according to claim 7, characterized in that: The device also includes a fixing seat, and both ends of the second cylinder extend out of the heat preservation box and are supported on the fixing seat.

9. The device according to claim 5, characterized in that: The device also includes a cooling assembly, which is arranged at the discharge port and multiple groups are arranged along the conveying direction of the cable, and / or the cooling assembly is arranged on the upper and lower sides of the cable output line.

10. The device according to claim 9, characterized in that: The cooling assembly includes a first tube body and / or a second tube body. The first tube body and the second tube body are connected to a water source and / or an air source. The outlets of the first tube body and the second tube body face the cable.

11. The device according to claim 10, characterized in that: The second tube body extends into the first tube body, and the outlet of the second tube body is located inside the first tube body.

12. The device according to claim 5, characterized in that: The heating component is at least located inside the first cylinder of the winding portion.

13. The device according to claim 5, characterized in that: The device also includes a driving component, a feed controller, and a traction component. The driving component cooperates with the first cylinder to drive the first cylinder to rotate; the feed controller is arranged upstream of the feed port to assist in the transportation of the cable; the traction component is arranged downstream of the discharge port to pull the cable for transportation.

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