Production process of aluminum alloy wire

Abstract

The invention discloses a production process of an aluminum alloy wire. The production process comprises the following steps: burdening; melting the batch to obtain molten aluminum; the molten aluminum is refined, and molten aluminum alloy is obtained; continuously casting the aluminum alloy liquid to obtain an aluminum alloy ingot; surface oxides of the aluminum alloy ingot are removed, and the aluminum alloy ingot is cleaned to obtain a clean aluminum alloy ingot; heating the clean aluminum alloy ingot to obtain a heated aluminum alloy ingot; continuously extruding the heated aluminum alloy ingot strip by adopting a continuous extruder, forcibly cooling the continuous extruder, and controlling the extrusion temperature to be 420 DEG C or below to obtain an extruded rod blank; quenching the extrusion rod blank on line to obtain a quenched extrusion rod blank; the quenched and extruded rod blank is subjected to wire drawing, coiled and taken up, and a coiled wire is obtained; and carrying out artificial aging annealing treatment on the coiled wire to obtain an aluminum alloy wire which is used as a conductor material for an overhead conductor. According to the production process, the mechanical and electrical performance of the prepared aluminum alloy wire can be improved, the productivity can be improved, and the supply requirement can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of metal plastic processing, and in particular relates to a production process of aluminum alloy wire. Background Art

[0002] At present, overhead conductors mainly use steel-core aluminum stranded wire. However, the variety and usage of aluminum alloy in the field of overhead conductors are continuing to grow. Compared with steel-core aluminum stranded wire, aluminum alloy is still a small-batch product, and its supply method is usually in the form of multiple bids and multiple winning bids. The specific amount allocated to each supplier is only a few hundred or a few thousand tons. Among them, when aluminum alloy is used as the conductor material of overhead conductors, in the production process of aluminum alloy wire, it is necessary to first carry out the aluminum alloy rod making step.

[0003] At present, manufacturers of aluminum alloy rods mainly adopt continuous casting and rolling technology. Many manufacturers have introduced large-scale continuous casting and rolling production lines. The production capacity of a production line is about 100,000 tons / year, which far exceeds the actual consumption of aluminum alloy wire. The equipment cost of large-scale continuous casting and rolling production lines is very high. However, due to the small required production capacity, the utilization rate of the equipment is very low, resulting in a waste of equipment resources; and most of the continuous casting and rolling production lines use imported material formulas, production processes and equipment, and the mechanical and electrical performance parameters of the products produced are relatively low. If the domestic optimized formula is used for the continuous casting and rolling production line, the corresponding continuous casting and rolling process parameters need to be adjusted. For the introduced production process, parameter adjustment is more difficult. In addition, the continuous casting and rolling production line is not designed according to the process route of the domestic optimized formula, so the test results are not ideal.

[0004] In order to improve the mechanical and electrical properties of the products produced, domestic optimized formulas are adopted in the process of aluminum alloy rod making, and horizontal continuous casting and Kangfu extrusion processes are used for the production of aluminum alloy wire. However, the production capacity of this process is too low to meet the supply requirements, and therefore it cannot be used for the industrial rod production of aluminum alloy wire. Summary of the Invention

[0005] In view of the above-mentioned defects of the prior art, the present invention provides a production process for aluminum alloy wire, which can improve the mechanical and electrical properties of the produced aluminum alloy wire, increase production capacity, and meet supply requirements.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A production process for aluminum alloy wire, comprising the following steps:

[0008] S1. Preparing the materials according to the chemical composition of the aluminum alloy wire to be prepared to obtain a batch material;

[0009] S2, melting the batch material obtained in step S1 to obtain molten aluminum;

[0010] S3, refining the aluminum liquid obtained in step S2 to obtain aluminum alloy liquid;

[0011] S4, continuously casting the aluminum alloy liquid obtained in step S3 to obtain aluminum alloy ingots;

[0012] S5. Remove surface oxides from the aluminum alloy ingot obtained in step S4 and clean it to obtain a clean aluminum alloy ingot;

[0013] S6, heating the clean aluminum alloy ingot obtained in step S5 to a certain temperature to obtain a heated aluminum alloy ingot;

[0014] S7, continuously extruding the heated aluminum alloy ingot obtained in step S6 using a continuous extruder, wherein during the continuous extrusion process, the continuous extruder is forced to cool, and the extrusion temperature is controlled at 460-560° C. and below 420° C. to obtain an extruded rod blank;

[0015] S8, performing online quenching on the extruded rod blank obtained in step S7 to obtain a quenched extruded rod blank;

[0016] S9, drawing the quenched extruded rod blank obtained in step S8 into a coil and collecting the coil to obtain a coiled wire;

[0017] S10. Perform artificial aging annealing on the coiled wire obtained in step S9 to obtain aluminum alloy wire, which is used as a conductor material for overhead wires.

[0018] Furthermore, step S4 is specifically as follows: the aluminum alloy liquid obtained in step S3 is continuously casted by a wheel-belt continuous casting machine, wherein the casting temperature is controlled at 680-750°C, the continuous casting speed is controlled at 8-15m / min, and the area is controlled at 1450-1500mm 2 Aluminum alloy ingots, in which continuous casting adopts zero-point flat casting.

[0019] Furthermore, the following step is included between step S4 and step S5: using a rolling shear to remove the aluminum alloy ingots obtained in step S4 with defects at the head and tail.

[0020] Furthermore, step S5 is specifically as follows: first, a fly-cutter wheel is used to remove burrs and surface oxides from the aluminum alloy ingot obtained in step S4, and then the surface of the aluminum alloy ingot is cleaned by high-pressure spraying, wherein the temperature of the cleaning liquid is controlled at 50-80°C to obtain a clean aluminum alloy ingot.

[0021] Furthermore, step S6 specifically comprises: heating the clean aluminum alloy ingot obtained in step S5 to 460-560° C. to obtain a heated aluminum alloy ingot.

[0022] Furthermore, in step S7: the diameter of the extruded rod blank obtained is controlled within a range of 9.5-17 mm. When the diameter of the extruded rod blank is 9.5 mm, a double-root extrusion method is adopted for extrusion of the rod blank. When the diameter of the extruded rod blank is 17 mm, a single-root extrusion method is adopted for extrusion of the rod blank. During the continuous extrusion process, a circulating coolant is used to forcibly cool the extrusion wheel, shoe seat and mold of the continuous extruder. The mold adopts a central tube cooling structure, specifically, the central core tube of the mold is used as the central cooling pipeline, and the coolant is passed into the central cooling pipeline of the mold.

[0023] Furthermore, in step S7: the mold adopts a split-flow combined mold or a tube extrusion mold; the temperature of the circulating coolant is controlled at 60-85°C.

[0024] Furthermore, step S8 is specifically as follows: using a high-pressure water blowing head to directly water quench the extruded rod blank obtained in step S7 online to obtain a quenched extruded rod blank with a temperature controlled at 60-280°C, and blowing the surface of the quenched extruded rod blank dry and winding it up on a constant tension winding machine.

[0025] Furthermore, step S9 is specifically as follows:

[0026] When the diameter of the extruded rod obtained in step S7 is 17 mm, the quenched extruded rod obtained in step S8 is first cold-rolled to a diameter of 9.5 mm using a six-pass cold rolling mill or a giant drawing mill, and then drawn into wire using a multi-die wire drawing machine, wherein the outlet wire diameter is controlled to be 4-5 mm and the wire is wound into a coil to obtain a coiled wire.

[0027] When the diameter of the extruded rod blank obtained in step S7 is controlled to be 9.5-12 mm, a multi-die wire drawing machine is used to draw the quenched extruded rod blank obtained in step S8 into a wire, wherein the diameter of the wire is controlled to be 1.5-3.99 mm and the wire is wound into a coil to obtain a coiled wire.

[0028] Furthermore, step S10 is specifically as follows: placing the coiled wire obtained in step S9 into a step-type continuous aging furnace and keeping it at 155-350° C. for 2-4 hours to perform artificial aging annealing treatment to obtain aluminum alloy wire, which is used as the conductor material of the overhead wire.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The production process of aluminum alloy wire in the present invention controls the extrusion temperature at 460-560°C and the extrusion temperature at below 420°C during the continuous extrusion process by forced cooling of the continuous extruder 7, so as to improve the cooling intensity before demoulding, reduce the extrusion temperature, increase the demoulding resistance, and form a stable high-temperature extrusion process. Moreover, the leakage can be reduced by cooling, the extrusion force can be increased, and the stability of the extrusion process can be maintained. Compared with the continuous casting and rolling process in the background technology, the production process of the present invention fully utilizes the characteristics of large shear deformation of continuous extrusion, and can regulate the strength and electrical conductivity of the aluminum alloy wire obtained subsequently by the characteristics of rapid die change and specification change of continuous extrusion. The continuous extrusion in the present invention is essentially a high-temperature deformation heat treatment process, which utilizes the combined effect of continuous extrusion deformation and deformation heat to achieve rapid solid solution of aluminum alloy, and since continuous extrusion has the characteristics of uniform product structure and performance, it can ensure The complete solid solution of the aluminum alloy is ensured throughout the entire production process, providing good organizational conditions for the subsequent artificial aging annealing treatment, thereby ensuring that the aluminum alloy wire has good organization, uniform mechanical properties and uniform electrical conductivity; and the production process is simple in steps, easy to operate, has a high yield rate and low cost. The aluminum alloy wire produced has high purity of composition, fully refined grains, uniform performance, excellent surface quality and stable quality, with a yield rate of more than 94%. The low cost is specifically reflected in the low equipment investment of this production process; by regulating the process parameters, this production process can be used for the production of a variety of aluminum alloy wires, such as high-strength aluminum alloy wires, medium-strength aluminum alloy wires, high-temperature resistant aluminum alloy wires and low-creep cable aluminum alloy wires, etc., to suit different application scenarios; this production process can improve the mechanical and electrical properties of the produced aluminum alloy wires, and can increase production capacity to meet supply requirements.

[0031] In step S7 of the present invention: during the continuous extrusion process, a circulating coolant is used to forcibly cool the extrusion wheel, shoe seat and mold of the continuous extruder, wherein the mold adopts a central tube cooling structure, specifically, the central core tube of the mold is used as the central cooling pipeline, and the coolant is passed into the central cooling pipeline of the mold; this can fully improve the cooling intensity before demolding, reduce the extrusion temperature, and increase the demolding resistance, thereby forming a stable high-temperature extrusion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the aluminum alloy rod making process in the production process of the aluminum alloy wire of the present invention;

[0033] Figure 2 The figure is a schematic diagram of the aluminum alloy wire making process in the production process of the aluminum alloy wire of the present invention.

[0034] Explanation of the reference numerals in the figure: 1. vertical furnace, 2. alloying refining furnace, 3. wheel-type continuous casting machine, 4. rolling shear, 5. deoxidation and cleaning station, 6. heater, 7. continuous extruder, 8. online quenching water tank, 9. winding machine, 10. double-head multi-die wire drawing machine. DETAILED DESCRIPTION

[0035] The following is a further detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0036] like Figure 1 and Figure 2 As shown, a production process of aluminum alloy wire includes the following steps:

[0037] S1. Preparing the materials according to the chemical composition of the aluminum alloy wire to be prepared to obtain a batch material;

[0038] S2, melting the batch material obtained in step S1 to obtain molten aluminum;

[0039] S3, refining the aluminum liquid obtained in step S2 to obtain aluminum alloy liquid;

[0040] S4, continuously casting the aluminum alloy liquid obtained in step S3 to obtain aluminum alloy ingots;

[0041] S5. Remove surface oxides from the aluminum alloy ingot obtained in step S4 and clean it to obtain a clean aluminum alloy ingot;

[0042] S6, heating the clean aluminum alloy ingot obtained in step S5 to a certain temperature to obtain a heated aluminum alloy ingot;

[0043] S7, continuously extruding the heated aluminum alloy ingot obtained in step S6 using a continuous extruder 7, wherein during the continuous extrusion process, the continuous extruder 7 is forced to cool, and the extrusion temperature is controlled at 460-560° C. and below 420° C. to obtain an extruded rod blank;

[0044] S8, performing online quenching on the extruded rod blank obtained in step S7 to obtain a quenched extruded rod blank;

[0045] S9, drawing the quenched extruded rod obtained in step S8 into a wire and winding it into a coil to obtain a coiled wire, wherein the outlet temperature of the drawn wire is controlled at 60-120° C.;

[0046] S10. Perform artificial aging annealing on the coiled wire obtained in step S9 to obtain aluminum alloy wire, which is used as a conductor material for overhead wires.

[0047] In this way, during the continuous extrusion process, the extrusion temperature is controlled at 460-560°C by forced cooling of the continuous extruder 7, and the extrusion temperature is controlled below 420°C, so as to improve the cooling intensity before demoulding, reduce the extrusion temperature, increase the demoulding resistance, and form a stable high-temperature extrusion process. Moreover, the leakage can be reduced by cooling, the extrusion force can be increased, and the stability of the extrusion process can be maintained. Compared with the continuous casting and rolling process in the background technology, the production process of the present invention fully utilizes the characteristics of large shear deformation of continuous extrusion, and the characteristics of rapid die change and specification change of continuous extrusion can regulate the strength and conductivity of the aluminum alloy wire obtained subsequently. The continuous extrusion in the present invention is essentially a high-temperature deformation heat treatment process, which utilizes the combined effect of continuous extrusion deformation and deformation heat to achieve rapid solid solution of aluminum alloy, and because continuous extrusion has the characteristics of uniform product organization and performance, it can ensure the entire production process. The complete solid solution of aluminum alloy in the process provides good organizational conditions for subsequent artificial aging annealing treatment, thereby ensuring that the aluminum alloy wire has good organization, uniform mechanical properties and uniform electrical conductivity; moreover, the production process is simple in steps, easy to operate, has a high yield rate and low cost, and the aluminum alloy wire produced has high purity of composition, fully refined grains, uniform performance, excellent surface quality and stable quality, with a yield rate of more than 94%. The low cost is specifically reflected in the low equipment investment of this production process; by adjusting the process parameters, this production process can be used for the production of a variety of aluminum alloy wires, such as high-strength aluminum alloy wires, medium-strength aluminum alloy wires, high-temperature resistant aluminum alloy wires and low creep cable aluminum alloy wires, etc., to suit different application scenarios; this production process can improve the mechanical and electrical properties of the produced aluminum alloy wires, and can increase production capacity to meet supply requirements.

[0048] Traditionally, when preparing aluminum alloy wire of aluminum-magnesium-silicon alloy, the production process control is difficult. However, when adopting this production process, while improving the quality, it can also improve the control level, reduce the process difficulty, and enhance the flexibility of process regulation.

[0049] In one embodiment, step S4 is specifically as follows: the aluminum alloy liquid obtained in step S3 is continuously casted by a belt-type continuous casting machine 3, wherein the casting temperature is controlled at 680-750°C, the continuous casting speed is controlled at 8-15m / min, and the area is controlled at 1450-1500mm 2 Aluminum alloy ingots, in which continuous casting adopts zero-point flat casting.

[0050] In this way, by adopting the zero-point flat pouring method, a small amount of oxides appearing in the aluminum alloy liquid can float to the upper surface of the aluminum alloy ingot.

[0051] In one embodiment, the following step is further included between step S4 and step S5: using a rolling shear 4 to remove the aluminum alloy ingots obtained in step S4 with defects at the head and tail.

[0052] In one embodiment, step S5 specifically comprises first using a fly-cut wheel to remove burrs and surface oxides from the aluminum alloy ingot obtained in step S4, and then cleaning the surface of the aluminum alloy ingot by high-pressure spraying, wherein the temperature of the cleaning solution is controlled at 50-80°C to obtain a clean aluminum alloy ingot. Removing surface oxides can make the aluminum alloy ingot purer and improve the conductivity and plasticity of the resulting aluminum alloy wire.

[0053] In one embodiment, step S6 specifically comprises: heating the clean aluminum alloy ingot obtained in step S5 to 460-560° C. to obtain a heated aluminum alloy ingot.

[0054] In one embodiment,

[0055] In step S7: the diameter of the extruded rod blank obtained is controlled at 9.5-17mm. When the diameter of the extruded rod blank is 9.5mm, the extrusion rod blank is extruded by a double-root extrusion method. When the diameter of the extruded rod blank is 17mm, the extrusion rod blank is extruded by a single-root extrusion method. During the continuous extrusion process, a circulating coolant is used to forcibly cool the extrusion wheel, shoe seat and mold of the continuous extruder 7. The mold adopts a central tube cooling structure, specifically, the central core tube of the mold is used as the central cooling pipeline, and the coolant is passed into the central cooling pipeline of the mold. In this way, the cooling intensity before demolding can be fully improved, the extrusion temperature can be reduced, and the demolding resistance can be increased, thereby forming a stable high-temperature extrusion process. The continuous extruder 7 adopts an extruder of LJ550 or above, and "550 or above" specifically means that the diameter of the extrusion wheel of the continuous extruder 7 is greater than or equal to 550mm.

[0056] Wherein, in step S7: the mold adopts a split-flow combined mold or a tube extrusion mold; the temperature of the circulating coolant is controlled at 60-85°C.

[0057] Wherein, step S9 is specifically as follows:

[0058] When the diameter of the extruded rod obtained in step S7 is 17 mm, the quenched extruded rod obtained in step S8 is first cold-rolled to a diameter of 9.5 mm using a six-pass cold rolling mill or a giant drawing mill, and then drawn into wire using a multi-die wire drawing machine, wherein the outlet wire diameter is controlled to be 4-5 mm and the wire is wound into a coil to obtain a coiled wire.

[0059] When the diameter of the extruded rod blank obtained in step S7 is controlled to be 9.5-12 mm, a multi-die wire drawing machine is used to draw the quenched extruded rod blank obtained in step S8 into a wire, wherein the diameter of the wire is controlled to be 1.5-3.99 mm and the wire is wound into a coil to obtain a coiled wire.

[0060] In this way, by controlling the total deformation during drawing, the strength and conductivity of the resulting aluminum alloy wire can be regulated. If the quenched extruded rod blank is first cold rolled and then drawn into a wire, a wire with a diameter controlled at 4-5 mm can be drawn. Therefore, the cold deformation is larger, which can improve the strength of the wire.

[0061] Preferably, when the diameter of the extruded rod blank obtained in step S7 is 17 mm, the quenched extruded rod blank obtained in step S8 is first cold-rolled to a diameter of 9.5 mm using a six-pass cold rolling mill.

[0062] Preferably, the multi-die wire drawing machine is a double-head multi-die wire drawing machine 10, and the outlet temperature of the drawn wire is controlled at 60-90°C.

[0063] In one embodiment, step S8 is specifically as follows: using a high-pressure water blowing head to directly water quench the extruded rod blank obtained in step S7 online to obtain a quenched extruded rod blank with a temperature controlled at 60-280°C, and blowing the surface of the quenched extruded rod blank dry and winding it up on a constant tension winding machine 9.

[0064] In one embodiment, step S10 specifically involves placing the coiled wire obtained in step S9 directly into a walking-beam continuous aging furnace and maintaining it at 155-350°C for 2-4 hours for artificial aging annealing to produce an aluminum alloy wire for use as a conductor material for overhead conductors. By placing the coiled wire directly into the walking-beam continuous aging furnace for artificial aging annealing, the residual heat from the wire drawing process can be utilized.

[0065] Example 1

[0066] A production process for high-strength and high-conductivity aluminum alloy wire comprises the following steps:

[0067] S1. According to the chemical composition of the aluminum alloy wire to be prepared, 99.7 wt % of aluminum ingot, Al-Si master alloy and Al-Fe master alloy are prepared to obtain a batch material;

[0068] S2, melting the batch material obtained in step S1 in a vertical furnace 1 to obtain molten aluminum;

[0069] S3. The aluminum liquid obtained in step S2 is transferred into the alloying refining furnace 2, and a magnesium ingot is added into the alloying refining furnace 2. After the magnesium ingot is melted, the aluminum liquid is subjected to a primary refining treatment. Then, aluminum boron and aluminum rare earth alloy are added into the alloying refining furnace 2 to perform a secondary refining treatment on the aluminum liquid to obtain an aluminum alloy liquid. The aluminum alloy liquid is then sampled and subjected to a chemical composition analysis using spectroscopy. The measured composition meets the requirements of the predetermined formula.

[0070] S4, the aluminum alloy liquid obtained in step S3 is continuously casted by a wheel-belt continuous casting machine 3, wherein the casting temperature is controlled at 720-740°C, the continuous casting speed is 12m / min, and the area is 1480mm 2 Aluminum alloy ingots;

[0071] S5, using a rolling shear 4 to remove the aluminum alloy ingot obtained in step S4 with defects on the head, and then using a fly wheel to remove the flash and surface oxides of the aluminum alloy ingot in a deoxidation and cleaning station 5, and cleaning the surface of the aluminum alloy ingot by high-pressure spraying to obtain a clean aluminum alloy ingot;

[0072] S6, heating the clean aluminum alloy ingot obtained in step S5 to 520-560° C. in a heater 6 to obtain a heated aluminum alloy ingot;

[0073] S7. The heated aluminum alloy ingot obtained in step S6 is continuously extruded using an LJ650 continuous extruder 7. During the continuous extrusion process, the continuous extruder 7 is forced to cool, and the extrusion temperature is controlled at 510-550° C., and the extrusion temperature is controlled at approximately 400° C. to obtain an extruded rod blank with a diameter of 9.5 mm or 17 mm. When the diameter of the extruded rod blank is 9.5 mm, a double-extrusion method is used for the extrusion of the rod blank. When the diameter of the extruded rod blank is 17 mm, a single-extrusion method is used for the extrusion of the rod blank. The LJ650 continuous extruder indicates that the extrusion wheel diameter of the continuous extruder is 650 mm.

[0074] S8, using a high-pressure water blower to directly water quench the extruded rod blank obtained in step S7 online to obtain a quenched extruded rod blank at a temperature of approximately 80° C., and then drying the surface of the quenched extruded rod blank and winding it onto a constant tension winding machine 9. The online water quenching requires an online quenching water tank 8;

[0075] S9. When the diameter of the extruded rod obtained in step S7 is 17 mm, the quenched extruded rod obtained in step S8 is first cold-rolled to a diameter of 9.5 mm using a six-pass cold rolling mill or a giant drawing mill, and then drawn into a wire using a multi-die wire drawing machine, wherein the wire has a diameter of 4.7 mm and is wound into a coil to obtain a coiled wire.

[0076] When the diameter of the extruded rod blank obtained in step S7 is 9.5 mm, the quenched extruded rod blank obtained in step S8 is drawn into a wire using a multi-die wire drawing machine, wherein the wire having a diameter of 2.35 mm is wound into a coil to obtain a coiled wire;

[0077] During the drawing process, the temperature of the drawn wire is controlled at approximately 80° C., and the temperature of the outlet wire is controlled at approximately 80° C. The multi-mode wire drawing machine can be a single-head multi-mode wire drawing machine or a double-head multi-mode wire drawing machine 10. If the double-head multi-mode wire drawing machine 10 is used, the drawing speed can be appropriately reduced while still having a high production efficiency.

[0078] S10. Place the coiled wire obtained in step S9 directly into a step-type continuous aging furnace and keep it at 180° C. for 4 hours to perform artificial aging annealing to obtain an aluminum alloy wire for use as a conductor material for overhead wires.

[0079] The mechanical properties and resistivity data of the aluminum alloy wire are shown in Table 1.

[0080] Specifications / mm Tensile strength / Mpa Elongation / % 20℃ resistivity / μΩ.m 4.70 332 5.1 31.06 2.35 381 4.2 31.75

[0081] As can be seen from Table 1, the aluminum alloy wire produced by the production process of Example 1 has high tensile strength and strong electrical conductivity, and the produced aluminum alloy wire is a high-strength and high-conductivity aluminum alloy wire.

[0082] Example 2

[0083] A production process for low-creep cable aluminum alloy wire comprises the following steps:

[0084] S1. According to the chemical composition of the aluminum alloy wire to be prepared, 99.7 wt % of aluminum ingot, Al-Fe master alloy and Al-Cu master alloy are prepared to obtain a batch material;

[0085] S2, melting the batch material obtained in step S1 in a vertical furnace 1 to obtain molten aluminum;

[0086] S3. The aluminum liquid obtained in step S2 is transferred into the alloying refining furnace 2 and subjected to a primary refining treatment. Aluminum boron and aluminum rare earth alloy are then added to the alloying refining furnace 2 to perform a secondary refining treatment on the aluminum liquid to obtain an aluminum alloy liquid. The aluminum alloy liquid is then sampled and subjected to a chemical composition analysis using spectroscopy. The measured composition meets the requirements of the predetermined formula.

[0087] S4, the aluminum alloy liquid obtained in step S3 is continuously casted by a wheel-belt continuous casting machine 3, wherein the casting temperature is controlled at 730-740°C, the continuous casting speed is 12.5m / min, and the area is 1480mm 2 Aluminum alloy ingots;

[0088] S5, using a rolling shear 4 to remove the aluminum alloy ingot obtained in step S4 with defects on the head, and then using a fly wheel to remove the flash and surface oxides of the aluminum alloy ingot in a deoxidation and cleaning station 5, and cleaning the surface of the aluminum alloy ingot by high-pressure spraying to obtain a clean aluminum alloy ingot;

[0089] S6, heating the clean aluminum alloy ingot obtained in step S5 to 460-490° C. in a heater 6 to obtain a heated aluminum alloy ingot;

[0090] S7. The heated aluminum alloy ingot obtained in step S6 is continuously extruded using an LJ650 continuous extruder 7. During the continuous extrusion process, the continuous extruder 7 is forced to cool, and the extrusion temperature is controlled at 470-490° C. and close to 400° C. to obtain an extruded rod blank with a diameter of 9.8 mm. The extruded rod blank is extruded using a double-root extrusion method.

[0091] S8, using a high-pressure water blower to directly water quench the extruded rod blank obtained in step S7 online to obtain a quenched extruded rod blank at a temperature of approximately 280° C., and drying the surface of the quenched extruded rod blank and winding it onto a constant tension winding machine 9. The online water quenching requires an online quenching water tank 8;

[0092] S9, using a multi-die wire drawing machine to draw the quenched extruded rod blank obtained in step S8 into a wire having a diameter of 3.2 mm and winding the wire into a coil to obtain a coiled wire;

[0093] The multi-mode wire drawing machine can be a single-head multi-mode wire drawing machine or a double-head multi-mode wire drawing machine 10, and the temperature of the outlet wire can be controlled at approximately 120°C by increasing the drawing speed;

[0094] S10. Place the coiled wire obtained in step S9 directly into a step-type continuous aging furnace and keep it at 320° C. for 2.8 hours to perform artificial aging annealing to obtain an aluminum alloy wire for use as a conductor material for overhead wires.

[0095] The mechanical properties and resistivity data of the aluminum alloy wire are shown in Table 2.

[0096] Specifications / mm Tensile strength / Mpa Elongation / % 20℃ resistivity / μΩ.m 3.20 115 22 28.05

[0097] It can be seen from Table 2 that the aluminum alloy wire produced by the production process of Example 2 has a lower tensile strength and a higher elongation, and the produced aluminum alloy wire is a low creep cable aluminum alloy wire.

[0098] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A production process for aluminum alloy wire, characterized in that: The following steps are involved: S1. preparing a batch according to the chemical composition of the aluminum alloy wire to be prepared; S2, melting the batch material to obtain molten aluminum; S3, refining the aluminum liquid to obtain aluminum alloy liquid; S4, continuously casting the aluminum alloy liquid to obtain aluminum alloy ingots; S5. removing surface oxides from the aluminum alloy ingot and cleaning the ingot to obtain a clean aluminum alloy ingot; S6. heating the clean aluminum alloy ingot to a certain temperature to obtain a heated aluminum alloy ingot; S7, continuously extruding the heated aluminum alloy ingot using a continuous extruder (7), wherein during the continuous extrusion process, the continuous extruder (7) is forced to cool, and the extrusion temperature is controlled at 460-560° C., and the extrusion temperature is controlled below 420° C. to obtain an extruded rod blank; S8, performing online quenching on the extruded rod blank to obtain a quenched extruded rod blank; S9, drawing the quenched extruded rod blank into a wire and winding the wire into a coil to obtain a coiled wire; S10. Performing artificial aging annealing on the coiled wire to obtain aluminum alloy wire, which is used as a conductor material for overhead wires.

2. The production process of an aluminum alloy wire according to claim 1, characterized in that: Step S4 is specifically as follows: the aluminum alloy liquid obtained in step S3 is continuously casted by a belt-type continuous casting machine (3), wherein the casting temperature is controlled at 680-750°C, the continuous casting speed is controlled at 8-15m / min, and the area is controlled at 1450-1500mm 2 Aluminum alloy ingots, in which continuous casting adopts zero-point flat casting.

3. The production process of an aluminum alloy wire according to claim 1, characterized in that: The following step is also included between step S4 and step S5: using a rolling shear (4) to remove the aluminum alloy ingots obtained in step S4 with defects at the head and tail.

4. The production process of an aluminum alloy wire according to claim 1, characterized in that: Step S5 specifically comprises: first using a fly-cutter wheel to remove burrs and surface oxides from the aluminum alloy ingot obtained in step S4, and then cleaning the surface of the aluminum alloy ingot by high-pressure spraying, wherein the temperature of the cleaning liquid is controlled at 50-80°C to obtain a clean aluminum alloy ingot.

5. The production process of an aluminum alloy wire according to claim 1, characterized in that: Step S6 specifically comprises heating the clean aluminum alloy ingot obtained in step S5 to 460-560° C. to obtain a heated aluminum alloy ingot.

6. The production process of an aluminum alloy wire according to claim 1, characterized in that: In step S7: the diameter of the obtained extruded rod blank is controlled to be 9.5-17 mm. When the diameter of the extruded rod blank is 9.5 mm, the extrusion rod blank is extruded by a double-root extrusion method. When the diameter of the extruded rod blank is 17 mm, the extrusion rod blank is extruded by a single-root extrusion method. During the continuous extrusion process, a circulating coolant is used to forcibly cool the extrusion wheel, shoe seat and mold of the continuous extruder (7). The mold adopts a central tube cooling structure, specifically, the central core tube of the mold is used as a central cooling pipeline, and the coolant is passed into the central cooling pipeline of the mold.

7. The production process of an aluminum alloy wire according to claim 6, characterized in that: In step S7: the mold adopts a split-flow combined mold or a tube extrusion mold; the temperature of the circulating coolant is controlled at 60-85°C.

8. The production process of an aluminum alloy wire according to claim 1, characterized in that: Step S8 specifically comprises: using a high-pressure water blowing head to directly water quench the extruded rod blank obtained in step S7 online to obtain a quenched extruded rod blank with a temperature controlled at 60-280°C, and drying the surface of the quenched extruded rod blank and winding it on a constant tension winding machine (9).

9. The production process of an aluminum alloy wire according to claim 6, characterized in that: Step S9 is specifically as follows: When the diameter of the extruded rod obtained in step S7 is 17 mm, the quenched extruded rod obtained in step S8 is first cold-rolled to a diameter of 9.5 mm using a six-pass cold rolling mill or a giant drawing mill, and then drawn into wire using a multi-die wire drawing machine, wherein the outlet wire diameter is controlled to be 4-5 mm and the wire is wound into a coil to obtain a coiled wire. When the diameter of the extruded rod blank obtained in step S7 is controlled to be 9.5-12 mm, a multi-die wire drawing machine is used to draw the quenched extruded rod blank obtained in step S8 into a wire, wherein the diameter of the wire is controlled to be 1.5-3.99 mm and the wire is wound into a coil to obtain a coiled wire.

10. The production process of an aluminum alloy wire according to claim 1, characterized in that: Step S10 specifically includes placing the coiled wire obtained in step S9 into a step-type continuous aging furnace and keeping it at 155-350° C. for 2-4 hours to perform artificial aging annealing to obtain aluminum alloy wire for use as a conductor material for overhead wires.

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