CN114334281A - Preparation process of copper-clad aluminum flat wire stretched and rolled by mold - Google Patents
Preparation process of copper-clad aluminum flat wire stretched and rolled by mold Download PDFInfo
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- CN114334281A CN114334281A CN202111641786.1A CN202111641786A CN114334281A CN 114334281 A CN114334281 A CN 114334281A CN 202111641786 A CN202111641786 A CN 202111641786A CN 114334281 A CN114334281 A CN 114334281A
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Abstract
The invention discloses a preparation process of a copper-clad aluminum flat wire stretched and rolled by a die, which comprises the following steps: preparing materials; copper-aluminum cladding welding; drawing and forming; processing a roller; annealing the clad wire; and (5) post-treatment. The invention has the following beneficial effects: the wire drawing die with the oval die groove and the flat wire roller with the oval roller surface are used for respectively drawing and rolling the copper-aluminum covered wire, the stability of the copper-aluminum covered wire in the drawing and rolling processes can be effectively improved, the copper-aluminum covered wire is prevented from being scratched, and meanwhile, the stress of the copper-aluminum covered wire is enabled to be more uniform, so that the wire is effectively prevented from cracking, the wire drawing die can be suitable for machining wires with smaller diameters, and the wire drawing die has the advantages of being difficult to crack, low in production efficiency and low in cost.
Description
Technical Field
The invention relates to a preparation process of a copper-clad aluminum flat wire, in particular to a preparation process of a copper-clad aluminum flat wire stretched and rolled by a mold.
Background
The copper-clad aluminum wire is an electric wire with an aluminum core wire as a main body and a copper layer arranged on the outer layer, and can be used as a conductor for a coaxial cable and a conductor for an electric wire and a cable in electric equipment. The copper-clad aluminum wire adopts a cladding welding manufacturing technology, a high-quality copper strip is concentrically clad on the outer surface of a core wire such as an aluminum rod or a steel wire, and firm metallurgical bonding is formed between a copper layer and the core wire, so that two different metal materials are combined into an integral body which can not be divided, drawing and annealing treatment can be carried out like processing a single metal wire, the copper and the aluminum are varied in the same proportion in the drawing process, and the volume ratio of the copper layer is kept relatively constant. The copper-clad aluminum wire has the advantages of good local performance and good conductivity, and is widely applied to the fields of coaxial cables and power lines in recent years.
The invention patent with the publication number of CN100474458C discloses a method for manufacturing a copper-clad aluminum flat wire, which comprises the following process steps: (1) copper-aluminum cladding welding under the protection of inert gas; (2) drawing by a series of wire drawing dies of a wire drawing machine, wherein the wire drawing temperature is lower than 240 ℃ and reaches a preset total deformation; (3) loading the mixture into an annealing furnace protected by inert gas for annealing the limited diffusion layer, and preserving the heat for 60-150 minutes after the preset temperature is reached; (4) rolling at least once on a two-roller flat rolling mill with the diameter of the roller matched with the diameter of the wire and reaching the preset size; (5) drawing a finished product on a drawing machine by using a rectangular wire drawing die to reach the geometric dimension of the finished product; (6) and carrying out softening annealing and wire rewinding in an inert atmosphere. It saves copper material by 53-60%, and its performance is stable and reliable, and integrates the advantages of copper and aluminium, and the contact surface can be metallurgically combined, and its self-weight can be reduced. Along with the increasing requirements of people on copper-clad aluminum wire products, people put forward higher requirements on the weight of copper-clad aluminum wires, and in order to reduce the weight of the copper-clad aluminum wires, the diameters of copper and aluminum need to be reduced in equal proportion.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a preparation process of a copper-clad aluminum flat wire drawn and rolled by a die, which comprises the following steps: preparing materials; copper-aluminum cladding welding; drawing and forming; processing a roller; annealing the clad wire; and post-treatment, the preparation process of the copper-clad aluminum flat wire stretched and rolled by the die has the advantage that the wire is not easy to crack.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation process of a copper-clad aluminum flat wire stretched and rolled by a mold comprises the following steps:
s1, preparing materials: presetting an aluminum core and a copper strip for later use, wherein the cross section of the aluminum core is oval as a whole;
s2, copper-aluminum cladding welding: coating the surface of the aluminum core with the copper strip, welding the copper strip under the protection of inert gas, and fixing the copper strip on the aluminum core to obtain a copper-aluminum coated wire;
s3, drawing and forming: drawing the copper-aluminum covered wire by using a wire drawing die with an oval die slot on a drawing machine, and clamping the copper-aluminum covered wire into the oval die slot;
s4, roll processing: performing roll machining on the copper-aluminum clad wire on a rolling mill by using a flat wire roll with an oval roll surface, and extruding the copper-aluminum clad wire to a finished product size through the oval roll surface;
s5, annealing of the clad wire: annealing the copper-aluminum clad wire in an inert atmosphere;
s6, post-processing: and (6) taking up the wire.
By such an arrangement: the wire drawing die with the oval die groove and the flat wire roller with the oval roller surface are used for respectively drawing and rolling the copper-aluminum covered wire, the stability of the copper-aluminum covered wire in the drawing and rolling processes can be effectively improved, the copper-aluminum covered wire is prevented from being scratched, and meanwhile, the stress of the copper-aluminum covered wire is enabled to be more uniform, so that the wire is effectively prevented from cracking, the advantage that the wire is not prone to cracking is achieved, and the wire drawing die can be suitable for processing the wire with the smaller diameter.
Preferably, the step of S1 further includes the steps of:
and rolling the aluminum core on a rolling mill by using a roller with an oval abutting surface, and extruding the aluminum core through the oval abutting surface to enable the cross section of the aluminum core to be oval as a whole.
By such an arrangement: the function of processing the cross section of the aluminum core into an oval shape is realized.
Preferably, the step of S1 further includes the steps of:
and annealing the aluminum core with the oval cross section in the inert atmosphere.
By such an arrangement: when guaranteeing the plasticity of copper aluminium covered wire, reduce the deflection of copper strips as far as possible to when can preventing that the copper strips from breaking, make the copper strips thickness on copper aluminium covered wire surface even, reached the wire rod be difficult to break and the even advantage of copper strips thickness.
Preferably, the step of S1 further includes the steps of:
in the annealing treatment of the aluminum core, the annealing temperature is 330-350 ℃, and the annealing heat preservation time is 2 hours.
By such an arrangement: the plasticity of the copper-aluminum covered wire is guaranteed, and meanwhile, the deformation of the copper strip is reduced as much as possible, so that the copper strip on the surface of the copper-aluminum covered wire is uniform in thickness while the copper strip is prevented from being broken. The advantages of difficult breakage of the wire and uniform thickness of the copper strip are achieved.
Preferably, the step of S2 further includes the steps of:
the copper strips are attached to the surface of the aluminum core and are uniformly distributed on the surface of the aluminum core.
By such an arrangement: the copper strips on the copper-aluminum covered wire are uniform in thickness, and the copper strips with uniform thickness are stressed more uniformly, so that the copper strips on the copper-aluminum covered wire are further prevented from cracking, and the advantage that the wire is not easy to crack is achieved.
Preferably, the step of S3 further includes the steps of:
and carrying out drawing processing on the copper-aluminum clad wire for multiple times, wherein the single-drawing reducing rate is controlled within 10%.
By such an arrangement: the copper-aluminum covered wire can be prevented from being damaged by pulling, and the cracking phenomenon on the copper-aluminum covered wire can be prevented.
Preferably, the step of S3 further includes the steps of:
the feeding speed of the drawing machine is 30-50 m/min.
By such an arrangement: the effect of improving the production efficiency is achieved, the stability of the copper-aluminum covered wire in the drawing process is improved, the copper-aluminum covered wire is prevented from generating cracks in violent shaking, and the effect of preventing the wire from cracking is achieved.
Preferably, the step of S4 further includes the steps of:
the feeding speed of the rolling mill is 1-3 m/min.
By such an arrangement: the effect of improving the production efficiency is achieved, the stability of the copper-aluminum covered wire in the roller machining process is improved, the copper-aluminum covered wire is prevented from generating cracks in violent shaking, and the effect of preventing the wire from cracking is achieved.
Preferably, the step of S5 further includes the steps of:
in the annealing treatment of the copper-aluminum coated wire, the annealing temperature is 200-300 ℃, and the annealing heat preservation time is 0.5-1.5 hours.
By such an arrangement: the copper-aluminum clad wire is prevented from cracking after being processed, the service life of the product is prolonged, the energy consumption is reduced, and the production cost is reduced.
Preferably, the step of S1 further includes the steps of:
the ratio of the minor axis to the major axis of the cross section of the aluminum core is 1: 3-1: 5.
by such an arrangement: when the requirement of a user on the overall dimension of the copper-clad aluminum flat wire is met, the aluminum core and the copper strip are stressed more uniformly in the drawing processing and roller processing processes, the structural strength of the aluminum core is ensured, and the effects of preventing the copper-clad aluminum flat wire from cracking and improving the reliability of a product are achieved.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the copper strip is coated on the aluminum core with the oval cross section, so that the cross section of the copper-aluminum coated wire formed after coating is oval, and the copper-clad aluminum flat wire with the oval cross section is convenient to process. The cross section of the copper-aluminum covered wire is wholly oval before the copper-aluminum covered wire is subjected to drawing forming and roll machining, the pressure of the copper-aluminum covered wire in the drawing forming and roll machining process can be effectively reduced, the uneven pressure of the copper-aluminum covered wire can be particularly reduced, and therefore the copper-aluminum covered wire can be effectively prevented from being crushed, and the effect of preventing the copper-aluminum covered wire from cracking is achieved.
2. In the drawing process, the copper-aluminum covered wire is clamped into the oval die groove, so that the wire drawing die can be attached to the surface of the copper-aluminum covered wire, the wire drawing die can stably clamp the copper-aluminum covered wire, the stability between the wire drawing die and the copper-aluminum covered wire is improved, the copper strip is prevented from being scratched due to relative sliding of the wire drawing die and the copper-aluminum covered wire, and the effect of preventing the wire from being cracked and damaged is achieved. Meanwhile, the wire drawing die is attached to the surface of the copper-aluminum covered wire, so that the wire drawing die can apply a more uniform clamping force on the surface of the copper-aluminum covered wire, the wire drawing die is prevented from scratching a copper strip on the copper-aluminum covered wire, and the effect of preventing the wire from cracking and being damaged can be achieved. And the copper-aluminum covered wire is clamped into the oval die groove, so that the influence of a wire drawing die on the cross section shape of the copper-aluminum covered wire can be reduced to the maximum extent, the cross section shape of the copper-aluminum covered wire is ensured to be stable, the stress of the copper-aluminum covered wire in the roller processing is uniform, the wire is further prevented from cracking, and the product percent of pass is improved.
3. In the roll processing process, the oval roll surface is attached to the copper-aluminum covered wire, so that the flat wire roll can be stably attached to the copper-aluminum covered wire, the stability between the flat wire roll and the copper-aluminum covered wire is improved, the copper strip is prevented from being scratched due to the relative sliding between the flat wire roll and the copper-aluminum covered wire, and the effect of preventing the wire from cracking and being damaged is achieved. Meanwhile, the flat wire roller is attached to the surface of the copper-aluminum coated wire, so that the flat wire roller can apply more uniform clamping force on the surface of the copper-aluminum coated wire, the copper strip on the copper-aluminum coated wire is prevented from being scratched by the flat wire roller, and the effect of preventing the wire from being cracked and damaged can be achieved. Moreover, the influence of the flat wire roller on the cross section shape of the copper-aluminum covered wire can be reduced to the maximum extent, the cross section shape of the copper-aluminum covered wire is ensured to be stable, the stress of the copper-aluminum covered wire in the roller processing is uniform, the wire is further prevented from cracking, and the product percent of pass is improved.
4. The wire drawing die with the oval die groove and the flat wire roller with the oval roller surface are used for respectively drawing and rolling the copper-aluminum covered wire, the stability of the copper-aluminum covered wire in the drawing and rolling processes can be effectively improved, the copper-aluminum covered wire is prevented from being scratched, and meanwhile, the stress of the copper-aluminum covered wire is enabled to be more uniform, so that the wire is effectively prevented from cracking, the advantage that the wire is not prone to cracking is achieved, and the wire drawing die can be suitable for processing the wire with the smaller diameter.
Drawings
FIG. 1 is a schematic flow chart of a process for manufacturing a copper clad aluminum flat wire drawn and rolled by a mold in example 1 of the present invention;
FIG. 2 is a schematic view showing the structure of a wire-drawing die and an elliptical die cavity in example 1 of the present invention;
fig. 3 is a schematic view of the structure of the flat wire roll and the oval roll surface in embodiment 1 of the present invention.
Reference numerals:
11. drawing a wire die; 12. an elliptical die cavity; 13. rolling the flat wire; 14. oval roll surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following embodiments.
Example 1:
referring to fig. 1, fig. 2 and fig. 3, a process for preparing a copper-clad aluminum flat wire by die drawing and rolling comprises the following steps:
s1, preparing materials: predetermine aluminium core and copper strips for use, the whole ellipse that is of aluminium core cross section uses the roll that is equipped with oval butt face to roll the aluminium core on the rolling mill to through oval butt face extrusion aluminium core, make the whole ellipse that is of aluminium core cross section, the ratio of aluminium core cross section minor axis and major axis is 1: 3-1: 5, annealing the aluminum core with the overall oval cross section in an inert atmosphere, wherein in the annealing treatment of the aluminum core, the annealing temperature is 330-350 ℃, and the annealing heat preservation time is 2 hours; the thickness of aluminium core is greater than the thickness of copper strips, and the copper sheet is made for red copper, and red copper has the advantage that electric conductivity is good and hardness is higher, when guaranteeing wire rod electric conductivity, plays the effect that prevents the copper strips damage.
S2, copper-aluminum cladding welding: and coating the surface of the aluminum core with the copper strip, welding the copper strip under the protection of inert gas, and fixing the copper strip on the aluminum core to obtain the copper-aluminum coated wire, wherein the copper strip is attached to the surface of the aluminum core and is uniformly distributed on the surface of the aluminum core.
S3, drawing and forming: drawing the copper-aluminum covered wire by using a wire drawing die 11 with an elliptical die cavity 12 on a drawing machine, clamping the copper-aluminum covered wire into the elliptical die cavity 12, and drawing the copper-aluminum covered wire for multiple times, wherein the single-drawing reducing rate is controlled within 10%, and the feeding speed of the drawing machine is 30-50 m/min; the wire drawing die 11 is used for clamping the wire, and after the wire drawing die 11 clamps the wire, the wire drawing die 11 is driven to move on the drawing machine, so that the wire drawing processing function is realized.
S4, roll processing: performing roll machining on the copper-aluminum clad wire on a rolling mill by using a flat wire roll 13 provided with an oval roll surface 14, and extruding the copper-aluminum clad wire to a finished product size through the oval roll surface 14, wherein the feeding speed of the rolling mill is 1-3 m/min; the flat wire roller 13 is integrally cylindrical, the cross section contour line of the oval roller surface 14 is arc-shaped, the oval roller surface 14 extends along the circumferential direction of the flat wire roller 13 and surrounds the outer wall of the flat wire roller 13, the flat wire roller 13 rolls on a workpiece and extrudes a copper-aluminum clad wire in the roller processing process, and the oval roller surface 14 keeps contact with the copper-aluminum clad wire.
S5, annealing of the clad wire: annealing the copper-aluminum coated wire in an inert atmosphere, wherein in the annealing treatment of the copper-aluminum coated wire, the annealing temperature is 200-300 ℃, and the annealing heat preservation time is 0.5-1.5 hours.
S6, post-processing: and (4) taking up, namely rolling and packaging the processed wire.
The embodiment has the following advantages:
the copper strip is coated on the aluminum core with the oval cross section, so that the cross section of the copper-aluminum coated wire formed after coating is oval, and the copper-clad aluminum flat wire with the oval cross section is convenient to process. The cross section of the copper-aluminum covered wire is wholly oval before the copper-aluminum covered wire is subjected to drawing forming and roll machining, the pressure of the copper-aluminum covered wire in the drawing forming and roll machining process can be effectively reduced, the uneven pressure of the copper-aluminum covered wire can be particularly reduced, and therefore the copper-aluminum covered wire can be effectively prevented from being crushed, and the effect of preventing the copper-aluminum covered wire from cracking is achieved.
In the drawing process, the copper-aluminum covered wire is clamped into the oval die groove, so that the wire drawing die can be attached to the surface of the copper-aluminum covered wire, the wire drawing die can stably clamp the copper-aluminum covered wire, the stability between the wire drawing die and the copper-aluminum covered wire is improved, the copper strip is prevented from being scratched due to relative sliding of the wire drawing die and the copper-aluminum covered wire, and the effect of preventing the wire from being cracked and damaged is achieved. Meanwhile, the wire drawing die is attached to the surface of the copper-aluminum covered wire, so that the wire drawing die can apply a more uniform clamping force on the surface of the copper-aluminum covered wire, the wire drawing die is prevented from scratching a copper strip on the copper-aluminum covered wire, and the effect of preventing the wire from cracking and being damaged can be achieved. And the copper-aluminum covered wire is clamped into the oval die groove, so that the influence of a wire drawing die on the cross section shape of the copper-aluminum covered wire can be reduced to the maximum extent, the cross section shape of the copper-aluminum covered wire is ensured to be stable, the stress of the copper-aluminum covered wire in the roller processing is uniform, the wire is further prevented from cracking, and the product percent of pass is improved.
In the roll processing process, the oval roll surface is attached to the copper-aluminum covered wire, so that the flat wire roll can be stably attached to the copper-aluminum covered wire, the stability between the flat wire roll and the copper-aluminum covered wire is improved, the copper strip is prevented from being scratched due to the relative sliding between the flat wire roll and the copper-aluminum covered wire, and the effect of preventing the wire from cracking and being damaged is achieved. Meanwhile, the flat wire roller is attached to the surface of the copper-aluminum coated wire, so that the flat wire roller can apply more uniform clamping force on the surface of the copper-aluminum coated wire, the copper strip on the copper-aluminum coated wire is prevented from being scratched by the flat wire roller, and the effect of preventing the wire from being cracked and damaged can be achieved. Moreover, the influence of the flat wire roller on the cross section shape of the copper-aluminum covered wire can be reduced to the maximum extent, the cross section shape of the copper-aluminum covered wire is ensured to be stable, the stress of the copper-aluminum covered wire in the roller processing is uniform, the wire is further prevented from cracking, and the product percent of pass is improved.
The wire drawing die with the oval die groove and the flat wire roller with the oval roller surface are used for respectively drawing and rolling the copper-aluminum covered wire, the stability of the copper-aluminum covered wire in the drawing and rolling processes can be effectively improved, the copper-aluminum covered wire is prevented from being scratched, and meanwhile, the stress of the copper-aluminum covered wire is enabled to be more uniform, so that the wire is effectively prevented from cracking, the advantage that the wire is not prone to cracking is achieved, and the wire drawing die can be suitable for processing the wire with the smaller diameter.
The roller with the oval abutting surface is used for rolling the aluminum core to deform the aluminum core, so that the cross section of the aluminum core is oval integrally, and the function of processing the cross section of the aluminum core into the oval shape is realized.
The hardness of the aluminum core can be reduced by annealing the aluminum core alone. In drawing process and roll course of working, when copper aluminium covered wire received pressure, can take place deformation through the lower and great aluminium core of thickness of hardness, when guaranteeing copper aluminium covered wire's plasticity, reduce the deflection of copper strips as far as possible to when can preventing that the copper strips from breaking, make the copper strips thickness on copper aluminium covered wire surface even. The advantages of difficult breakage of the wire and uniform thickness of the copper strip are achieved.
The annealing temperature of the aluminum core is 330-350 ℃, the annealing heat preservation time is 2 hours, the hardness of the aluminum core in the copper-aluminum covered wire is low enough, the plasticity of the copper-aluminum covered wire is guaranteed, and meanwhile, the deformation of the copper strip is reduced as much as possible, so that the copper strip thickness on the surface of the copper-aluminum covered wire is uniform while the copper strip is prevented from being broken. The advantages of difficult breakage of the wire and uniform thickness of the copper strip are achieved.
The annealing temperature of the aluminum core is more than 330 ℃, the heat preservation time is not less than 2 hours, and the aluminum core in the copper-aluminum clad wire is ensured to have low enough hardness; the annealing temperature of the aluminum core is less than 350 ℃, the heat preservation time is not more than 2 hours, the effect of reducing energy consumption is achieved, and the production cost is reduced.
The copper strip is attached to the surface of the aluminum core and is uniformly distributed on the surface of the aluminum core, so that the thickness of the copper strip on the copper-aluminum covered wire is uniform, and the copper strip on the copper-aluminum covered wire is not easy to crack. And when the copper-aluminum covered wire is stressed, the copper strips with uniform thickness are stressed more uniformly, so that the copper strips on the copper-aluminum covered wire are further prevented from cracking, and the advantage that the wire is not easy to crack is achieved.
The copper-aluminum covered wire is subjected to drawing processing for multiple times, the single drawing reducing rate is controlled within 10%, the effect of preventing the copper-aluminum covered wire from being damaged by drawing is achieved, and the phenomenon of cracking on the copper-aluminum covered wire is prevented.
The feeding speed of the drawing machine is more than 30m/min, so that the production efficiency is improved; the feeding speed of the drawing machine is less than 50m/min, the copper-aluminum covered wire is prevented from shaking violently in the drawing process, the effect of improving the stability of the copper-aluminum covered wire in the drawing process is achieved, the copper-aluminum covered wire is prevented from cracking in the violent shaking process, and the effect of preventing the wire from cracking is achieved.
The feeding speed of the rolling mill is more than 1m/min, so that the production efficiency is improved; the feeding speed of the rolling mill is less than 3m/min, the copper-aluminum covered wire is prevented from shaking violently in the roll machining process, the effect of improving the stability of the copper-aluminum covered wire in the roll machining process is achieved, the copper-aluminum covered wire is prevented from cracking in the violent shaking, and the effect of preventing the wire from cracking is achieved.
The annealing temperature of the aluminum core is more than 200 ℃, the heat preservation time is more than 0.5 hour, the internal stress of the copper-aluminum clad wire is eliminated, the copper-aluminum clad wire is prevented from cracking after being processed, and the effect of prolonging the service life of the product is achieved; the annealing temperature of the aluminum core is less than 350 ℃, the heat preservation time is less than 2 hours, the effect of reducing energy consumption is achieved, and the production cost is reduced.
By setting the ratio of the major axis to the minor axis of the elliptical cross-section of the aluminum core to 1: 3-1: 5, when the requirement of users on the overall dimension of the copper-clad aluminum flat wire is met, the aluminum core and the copper strip are stressed more uniformly in the drawing processing and roller processing processes, the structural strength of the aluminum core is ensured, and the effects of preventing the copper-clad aluminum flat wire from cracking and improving the reliability of products are achieved.
The ratio of the major axis to the minor axis of the elliptical cross-section of the aluminum core is greater than 1: 5, prevent that aluminium core minor axis length undersize from influencing the structural strength of aluminium core, play the effect that improves aluminium core structural stability. The ratio of the major axis to the minor axis of the elliptical cross-section of the aluminum core is less than 1: and 3, the copper-aluminum covered wire formed after the copper strip covers the aluminum core is flatter, so that the stress of the copper-aluminum covered wire in the drawing processing and roller processing processes is more uniform, and the function of preventing the copper-aluminum covered wire from cracking is achieved.
Example 2:
a preparation process of a copper-clad aluminum flat wire stretched and rolled by a mold comprises the following steps:
s1, preparing materials: predetermine aluminium core and copper strips for use, the whole ellipse that is of aluminium core cross section uses the roll that is equipped with oval butt face to roll the aluminium core on the rolling mill to through oval butt face extrusion aluminium core, make the whole ellipse that is of aluminium core cross section, the ratio of aluminium core cross section minor axis and major axis is 1: 4, annealing the aluminum core with the oval cross section in the inert atmosphere, wherein the annealing temperature is 350 ℃ and the annealing heat preservation time is 2 hours; the thickness of aluminium core is greater than the thickness of copper strips, and the copper sheet is made for red copper, and red copper has the advantage that electric conductivity is good and hardness is higher, when guaranteeing wire rod electric conductivity, plays the effect that prevents the copper strips damage.
S2, copper-aluminum cladding welding: and coating the surface of the aluminum core with the copper strip, welding the copper strip under the protection of inert gas, and fixing the copper strip on the aluminum core to obtain the copper-aluminum coated wire, wherein the copper strip is attached to the surface of the aluminum core and is uniformly distributed on the surface of the aluminum core.
S3, drawing and forming: performing drawing processing on the copper-aluminum covered wire by using a drawing die with an oval die slot on a drawing machine, clamping the copper-aluminum covered wire into the oval die slot, performing drawing processing on the copper-aluminum covered wire for multiple times, controlling the single drawing reducing rate within 10%, and controlling the feeding speed of the drawing machine to be 30 m/min; the wire drawing die is used for clamping the wire, and after the wire is clamped by the wire drawing die, the wire drawing die is driven to move on the drawing machine, so that the wire is drawn.
S4, roll processing: performing roll machining on the copper-aluminum clad wire on a rolling mill by using a flat wire roll with an oval roll surface, and extruding the copper-aluminum clad wire to a finished product size through the oval roll surface, wherein the feeding speed of the rolling mill is 1 m/min; the flat wire roller is integrally cylindrical, the cross section contour line of the oval roller surface is arc-shaped, the oval roller surface extends along the circumferential direction of the flat wire roller and surrounds the outer wall of the flat wire roller, the flat wire roller rolls on a workpiece and extrudes a copper-aluminum clad wire in the roller machining process, and the oval roller surface is kept in contact with the copper-aluminum clad wire.
S5, annealing of the clad wire: annealing the copper-aluminum coated wire in an inert atmosphere, wherein the annealing temperature is 200 ℃ and the annealing heat preservation time is 1 hour.
S6, post-processing: and (4) taking up, namely rolling and packaging the processed wire.
Example 3:
a preparation process of a copper-clad aluminum flat wire stretched and rolled by a mold comprises the following steps:
s1, preparing materials: predetermine aluminium core and copper strips for use, the whole ellipse that is of aluminium core cross section uses the roll that is equipped with oval butt face to roll the aluminium core on the rolling mill to through oval butt face extrusion aluminium core, make the whole ellipse that is of aluminium core cross section, the ratio of aluminium core cross section minor axis and major axis is 1: 4, annealing the aluminum core with the oval cross section in the inert atmosphere, wherein the annealing temperature is 350 ℃ and the annealing heat preservation time is 2 hours; the thickness of aluminium core is greater than the thickness of copper strips, and the copper sheet is made for red copper, and red copper has the advantage that electric conductivity is good and hardness is higher, when guaranteeing wire rod electric conductivity, plays the effect that prevents the copper strips damage.
S2, copper-aluminum cladding welding: and coating the surface of the aluminum core with the copper strip, welding the copper strip under the protection of inert gas, and fixing the copper strip on the aluminum core to obtain the copper-aluminum coated wire, wherein the copper strip is attached to the surface of the aluminum core and is uniformly distributed on the surface of the aluminum core.
S3, drawing and forming: performing drawing processing on the copper-aluminum covered wire by using a drawing die with an oval die slot on a drawing machine, clamping the copper-aluminum covered wire into the oval die slot, performing drawing processing on the copper-aluminum covered wire for multiple times, controlling the single drawing reducing rate within 8%, and controlling the feeding speed of the drawing machine to be 50 m/min; the wire drawing die is used for clamping the wire, and after the wire is clamped by the wire drawing die, the wire drawing die is driven to move on the drawing machine, so that the wire is drawn.
S4, roll processing: performing roll machining on the copper-aluminum clad wire on a rolling mill by using a flat wire roll with an oval roll surface, and extruding the copper-aluminum clad wire to a finished product size through the oval roll surface, wherein the feeding speed of the rolling mill is 3 m/min; the flat wire roller is integrally cylindrical, the cross section contour line of the oval roller surface is arc-shaped, the oval roller surface extends along the circumferential direction of the flat wire roller and surrounds the outer wall of the flat wire roller, the flat wire roller rolls on a workpiece and extrudes a copper-aluminum clad wire in the roller machining process, and the oval roller surface is kept in contact with the copper-aluminum clad wire.
S5, annealing of the clad wire: annealing the copper-aluminum coated wire in an inert atmosphere, wherein the annealing temperature is 280 ℃ and the annealing heat preservation time is 0.5 hour.
S6, post-processing: and (4) taking up, namely rolling and packaging the processed wire.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A preparation process of a copper-clad aluminum flat wire stretched and rolled by a mold is characterized by comprising the following steps:
s1, preparing materials: presetting an aluminum core and a copper strip for later use, wherein the cross section of the aluminum core is oval as a whole;
s2, copper-aluminum cladding welding: coating the surface of the aluminum core with the copper strip, welding the copper strip under the protection of inert gas, and fixing the copper strip on the aluminum core to obtain a copper-aluminum coated wire;
s3, drawing and forming: drawing the copper-aluminum covered wire by using a wire drawing die with an oval die slot on a drawing machine, and clamping the copper-aluminum covered wire into the oval die slot;
s4, roll processing: performing roll machining on the copper-aluminum clad wire on a rolling mill by using a flat wire roll with an oval roll surface, and extruding the copper-aluminum clad wire to a finished product size through the oval roll surface;
s5, annealing of the clad wire: annealing the copper-aluminum clad wire in an inert atmosphere;
s6, post-processing: and (6) taking up the wire.
2. The process for preparing copper clad aluminum flat wire by die drawing and rolling according to claim 1, wherein in the step of S1, the process further comprises the following steps:
and rolling the aluminum core on a rolling mill by using a roller with an oval abutting surface, and extruding the aluminum core through the oval abutting surface to enable the cross section of the aluminum core to be oval as a whole.
3. The process for preparing copper clad aluminum flat wire by die drawing and rolling according to claim 2, wherein in the step of S1, the process further comprises the following steps:
and annealing the aluminum core with the oval cross section in the inert atmosphere.
4. The process for preparing copper clad aluminum flat wire by die drawing and rolling according to claim 3, wherein in the step of S1, the process further comprises the following steps:
in the annealing treatment of the aluminum core, the annealing temperature is 330-350 ℃, and the annealing heat preservation time is 2 hours.
5. The process for preparing copper clad aluminum flat wire by die drawing and rolling according to claim 1, wherein in the step of S2, the process further comprises the following steps:
the copper strips are attached to the surface of the aluminum core and are uniformly distributed on the surface of the aluminum core.
6. The process for preparing copper clad aluminum flat wire by die drawing and rolling according to claim 1, wherein in the step of S3, the process further comprises the following steps:
and carrying out drawing processing on the copper-aluminum clad wire for multiple times, wherein the single-drawing reducing rate is controlled within 10%.
7. The process for preparing copper clad aluminum flat wire by die drawing and rolling according to claim 1, wherein in the step of S3, the process further comprises the following steps:
the feeding speed of the drawing machine is 30-50 m/min.
8. The process for preparing copper clad aluminum flat wire by die drawing and rolling according to claim 1, wherein in the step of S4, the process further comprises the following steps:
the feeding speed of the rolling mill is 1-3 m/min.
9. The process for preparing copper clad aluminum flat wire by die drawing and rolling according to claim 1, wherein in the step of S5, the process further comprises the following steps:
in the annealing treatment of the copper-aluminum coated wire, the annealing temperature is 200-300 ℃, and the annealing heat preservation time is 0.5-1.5 hours.
10. The process for preparing copper clad aluminum flat wire by die drawing and rolling according to claim 1, wherein in the step of S1, the process further comprises the following steps:
the ratio of the minor axis to the major axis of the cross section of the aluminum core is 1: 3-1: 5.
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