Roll extrusion forming method and equipment for continuously rolling and covering graphene metal composite wire

Abstract

The invention relates to the field of material processing, in particular to a continuous winding graphene metal composite wire roll-extrusion forming method and equipment, and the equipment comprises a base material conveying module, a base material pretreatment and winding integrated module, a covering material conveying and pretreatment integrated module, a heat treatment module, a roll-extrusion forming module and a material pulling module. The six modules are connected and combined together through the discharging ports and the feeding hopper, after metal wires are pretreated, the metal wires are extruded and rotated while being driven to advance, the metal wires are wound with the covering material, multi-dimensional and multi-size covering can be carried out on the metal wires, and the covering efficiency is improved. Pretreatment and roll extrusion forming of a base material and a covering material can be continuously carried out in one procedure, the consumption of graphene is reduced, the coated graphene is separated into a thin layer or even a single layer under the action of shear force in the rotary extrusion friction process, the conductivity and mechanical performance of the composite wire are greatly enhanced, and the service life of the composite wire is prolonged. And finally, the graphene metal composite wires and bars with excellent performance and uniform and fine crystal grains are prepared, the coating success rate is increased, meanwhile, the production efficiency is improved, and the method is high in flexibility and easy to repair and maintain.

Description

Technical Field

[0001] The present invention relates to the field of material processing, and particularly to a rolling and extrusion forming method and device for continuously roll-cladding graphene metal composite wire rods. Background Art

[0002] The continuous roll-cladding technology is a processing method for roll-cladding continuous metal materials together to form composite materials. Different from the traditional roll-cladding technology, the continuous roll-cladding technology can achieve uninterrupted continuous production and improve production efficiency. The continuous roll-cladding technology is characterized by high efficiency, continuity, and precision, and is widely used in various fields such as automobiles, construction, and electronics. Especially in the field of wire rods, due to the skin effect, the current will be concentrated on the surface of the conductor. In recent years, the research and development of technologies such as copper-clad aluminum, graphene-coated aluminum, and aluminum-clad steel have been changing rapidly, in order to realize the substitution of copper with aluminum as soon as possible and replace scarce and expensive metals with widely distributed cheap metals. At the same time, this technology can realize the combination of different metal materials, provide customized solutions, and has excellent performance and application potential.

[0003] The processing method of the traditional continuous cladding technology is to use a production line, which is completed by steps such as raw material preparation, cladding material feeding, material feeding, cladding process, drying or curing, and finished product collection and packaging. This process requires feeding devices such as conveyor belts, hoppers, and continuous extruders, as well as drying or curing devices such as drying ovens and ultraviolet curing equipment.

[0004] However, the processing method of the traditional continuous cladding technology is single, and it can only clad continuous materials, unable to perform multi-dimensional and multi-scale cladding. The cladding process is long, and when graphene-coated aluminum is carried out, the consumption rate of graphene is high, and the cladding success rate is low. It is very difficult to obtain wire rods such as graphene-coated aluminum rods and wires with good performance and stable quality. Summary of the Invention

[0005] Aiming at the above deficiencies of the prior art, the present invention provides a rolling and extrusion forming method and device for continuously roll-cladding graphene metal composite wire rods, which can continuously perform the pretreatment and plastic deformation rolling and extrusion processing of the base wire rod and the cladding material in one process, can perform multi-dimensional and multi-scale cladding, reduce the consumption rate of graphene when graphene-coated aluminum is carried out, and improve the cladding success rate, improve the quality of the product, and has high production efficiency.

[0006] The rolling and extrusion forming method for continuously roll-cladding graphene metal composite wire rods provided by the present invention includes:

[0007] Drive the metal wire rod to move forward and rotate the metal wire rod to perform pretreatment on the metal wire rod;

[0008] Spread graphene powder on the metal wire rod and roll-clad a covering material on the metal wire rod to form a multi-layer structure wire rod;

[0009] Extrude and rotate the multi-layer structural wire so that the metal wire, graphene powder and covering material form a mechanical bond and a metallurgical bond to form a composite wire;

[0010] Perform heat treatment on the composite wire;

[0011] Output the composite wire after secondary extrusion after heat treatment.

[0012] Preferably, the method for pre-treating the metal wire includes cleaning the metal wire, degreasing the metal wire, grinding the surface of the metal wire, and removing the oxide layer on the surface of the metal wire.

[0013] Preferably, before winding the covering material, degrease the covering material, grind the surface of the covering material, and remove the oxide layer.

[0014] Based on the above method, the present invention further provides a continuous winding graphene metal composite wire rolling and extrusion forming device, and the device performs the above method when in use.

[0015] Preferably, the continuous winding graphene metal composite wire rolling and extrusion forming device includes a base material pre-treatment and winding integrated module. The base material pre-treatment and winding integrated module includes a housing. One side of the housing is provided with a second base material inlet, and the other side is provided with an outlet. A grinding part is arranged inside the housing. A covering material inlet is arranged on the housing. The covering material inlet is located between the grinding part and the outlet. A powder stirring mechanism is arranged on the top of the housing. The powder stirring mechanism has a powder outlet. The covering material inlet is located between the powder outlet and the outlet. A winding and extrusion integrated die is arranged inside the housing. The winding and extrusion integrated die is arranged between the powder outlet and the outlet.

[0016] Preferably, the winding and extrusion integrated die includes an extrusion channel. One side of the extrusion channel has a first center line. The inlet of the extrusion channel is larger than the outlet, and there is a connection line between the inlet and the outlet. The angle between the connection line and the first center line is set to 5°-10°.

[0017] Preferably, the housing is connected with a covering material inlet channel. The covering material inlet channel is communicated with the covering material inlet. The covering material inlet channel has a second center line. The angle between the second center line and the first center line is set to 45°-55°.

[0018] Preferably, the grinding part includes a horizontally arranged grinding tool and a vertically arranged grinding tool. The horizontally arranged grinding tool is fixedly arranged on one side inside the housing. The vertically arranged grinding tool is arranged on the inner top of the housing. A debris outlet is arranged at the bottom of the housing.

[0019] Preferably, a degreasing hopper is provided above the housing. The bottom outlet of the degreasing hopper communicates with the housing, and the outlet of the degreasing hopper is located between the second substrate inlet and the grinding part.

[0020] Preferably, the powder stirring mechanism includes a powder hopper, which is arranged above the housing, and a turbine is arranged in the powder hopper.

[0021] Compared with the prior art, the continuous roll-coating graphene metal composite wire rolling and extrusion forming method and equipment provided by the present invention have the following beneficial effects:

[0022] 1. After pre-treating the metal wire, the present invention extrudes and rotates the metal wire while driving it forward, so that the covering material is rolled on the metal wire. It can perform multi-dimensional and multi-size coating on the metal wire, and can continuously pre-treat the substrate and the covering material and roll and extrude them into shape in one process, reducing the consumption of graphene. Finally, graphene metal composite wires and rods with excellent performance, uniform and fine grains and high thermal conductivity are prepared, improving the coating success rate and the production efficiency at the same time.

[0023] 2. The graphene coated on the metal wire of the present invention is separated into thin layers or even single layers under the action of shear force during the rotary extrusion friction process, greatly enhancing the electrical conductivity and mechanical properties of the composite wire.

[0024] 3. The present invention can process wires or rods by replacing the roll-coating and extrusion integrated die, and adding a wire coiler can coil the prepared composite wire into a wire coil. With modular design, it is easy to operate, has a short process flow, and the production efficiency is much higher than that of traditional step-by-step pre-treatment non-continuous processing roll-coating and rolling and extrusion forming processing equipment. Due to the modular design, the present invention has strong flexibility, is easy to repair and maintain, and can add, reduce modules or realize combinations of various continuous deformation process methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a cross-sectional view of the substrate conveying module of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the substrate pre-treatment and roll-coating integrated module of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the covering material conveying and pre-treatment integrated module of the present invention;

[0029] Figure 5 It is a schematic diagram of the structure of the covering material conveying and pre-treatment integrated module of the present invention;

[0030] Figure 6 It is a partial cross-sectional view of the rolling and extruding forming module of the present invention;

[0031] Figure 7 For the present invention Figure 6 The cross-sectional view in the A-A direction in;

[0032] Figure 8 It is a partial cross-sectional view of the material pulling module of the present invention.

[0033] Explanation of reference numerals in the drawings:

[0034] 1 Substrate conveying module; 101 First substrate inlet; 102 First material conveying roller shaft; 103 First guiding and limiting roller shaft; 104 Second material conveying roller shaft; 105 First substrate outlet; 106 First box body; 107 First base;

[0035] 2 Substrate pretreatment and coiling integrated module; 201 Material guiding cover; 202 Second substrate inlet; 203 Degreasing hopper; 204 Waste liquid outlet; 205 Horizontally placed grinding tool; 206 Vertically placed grinding tool; 207 Chip outlet; 208 Powder stirring mechanism; 209 Powder hopper; 210 Coiling and extrusion integrated die; 211 Second substrate outlet; 212 Shell; 213 Base; 214 Covering material inlet;

[0036] 3 Covering material conveying and pretreatment integrated module; 301 Covering material inlet; 302 Third material conveying roller shaft; 303 Degreasing integrated block; 304 Coarse grinding block; 305 Fine grinding block; 306 Fourth material conveying roller shaft; 307 Covering material outlet; 308 Second box body; 309 Second base; 310 Solid-liquid waste collection box;

[0037] 4 Heat treatment module; 401 First composite material inlet; 402 Third box body; 403 Heating wire groove; 404 Composite material outlet; 405 Third base;

[0038] 5 Rolling and extruding forming module; 501 Hot composite material inlet; 502 Adjustable extrusion roller; 503 Fixed extrusion roller; 504 Hot composite material outlet; 505 Fourth box body; 506 Fourth base;

[0039] 6 Material pulling module; 601 Second composite material inlet; 602 Primary material pulling shaft; 603 Guiding and limiting roller shaft; 604 Secondary material pulling shaft; 605 Composite material outlet; 606 Fifth box body; 607 Fifth base. Detailed implementation manners

[0040] The following combines the attached Figures 1 to 8 drawings to describe the detailed implementation manners of the present invention in detail, but it should be understood that the protection scope of the present invention is not limited by the detailed implementation manners.

[0041] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0042] In addition, in the description of the present application, "a plurality of" means two or more than two. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as implying or suggesting relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0043] Embodiment 1

[0044] The continuous roll-coated graphene metal composite wire rolling and extrusion forming method provided in this embodiment includes the following steps:

[0045] Drive the metal wire forward and rotate the metal wire to perform pre-treatment on the metal wire;

[0046] Spread graphene powder on the metal wire and roll a covering material on the metal wire to form a multi-layer structure wire;

[0047] Specifically in production, according to actual needs, graphene powder can be spread first and then the covering material is rolled; or the covering material can be rolled first and then graphene powder is spread.

[0048] Extrude and rotate the multi-layer structure wire to form a mechanical bond and a metallurgical bond among the metal wire, graphene powder, and covering material to form a composite wire:

[0049] The metal wire is driven by an external rotary feeder to rotate clockwise and move forward. During the process of rotating and moving forward, the metal wire can roll the covering material and graphene powder onto the metal wire together. Under the action of rotational friction and extrusion deformation, the wire undergoes large plastic deformation, achieving effects such as grain refinement and strain hardening. The graphene coated inside is uniformly spread under the action of shear force and can produce thinner graphene layers. The temperature of the thin plate increases when it undergoes friction and large deformation together with the wire, and mechanical bonding and metallurgical bonding occur among the three.

[0050] Perform on-line continuous heat treatment on the composite wire at 500 °C.

[0051] Perform secondary extrusion on the composite wire after heat treatment and then output it:

[0052] During the rotary swaging process, friction and extrusion deformation occur again. After secondary extrusion and compaction, most of the composite wire shows metallurgical bonding. Fine grains and ultrafine grains are formed after secondary extrusion.

[0053] Under the action of large deformation and torsional friction, a large number of fine grains and ultrafine grains are formed between the base material and the covering material of the composite wire, greatly improving the strength. And the graphene evenly covering its surface can become an excellent conductive medium under the support of the skin effect theory, providing extremely high electrical conductivity. The outermost thin plate can protect the graphene sandwich layer, obtaining a composite wire with excellent performance, fine structure, high strength, high quality and high electrical conductivity, and finally realizing energy-saving and carbon-reducing replacement solutions such as replacing copper with aluminum and replacing heavy materials with light materials.

[0054] Selecting the method of spreading graphene powder first and then winding the covering material can reduce the consumption rate of graphene.

[0055] By the method of winding the covering material and graphene powder together on the metal wire while extruding and rotating, multi-dimensional and multi-scale wire coating can be realized, reducing the coating steps and improving the coating success rate and coating efficiency.

[0056] In this embodiment, the method for pre-treating the metal wire includes cleaning the metal wire, degreasing the metal wire, grinding the surface of the metal wire, and removing the oxide layer on the surface of the metal wire:

[0057] The surface grease and dirt are washed off by the degreasing solution, and the waste degreasing solution is discharged. The wire continues to move forward and successively passes through a horizontally placed grinding tool and a vertically placed grinding tool, and the fresh non-oxidized surface of the wire is exposed.

[0058] In this embodiment, before winding the covering material, the covering material is degreased and the surface of the covering material is ground to remove the oxide layer:

[0059] The covering material is conveyed to the degreasing integrated block by a primary feeding roller. After degreasing treatment, it immediately enters the rough and fine grinding blocks to remove the oxide layer. The debris and waste liquid flow into the solid-liquid waste collection box, and the pre-treated covering material is conveyed to be wound together with the metal wire.

[0060] Embodiment 2

[0061] On the basis of Embodiment 1, the continuous winding graphene metal composite wire rotary swaging forming equipment provided in this embodiment includes a base material conveying module 1, a base material pre-treatment and winding integrated module 2, a covering material conveying and pre-treatment integrated module 3, a heat treatment module 4, a rotary swaging forming module 5, and a pulling module 6. The 6 modules are connected and combined through the discharge port and the feed hopper.

[0062] Such asFigure 2 As shown, the substrate conveying module 1 includes a first substrate inlet 101, a first material conveying roller shaft 102, a first guiding and limiting roller shaft 103, a second material conveying roller shaft 104, a first substrate outlet 105, a first box body 106, and a first base 107.

[0063] Three pairs of material conveying roller shafts are arranged in the first box body 106 of the substrate conveying module 1. The first material conveying roller shaft 102 is close to the first substrate inlet 101, and the second material conveying roller shaft 104 is close to the first substrate outlet 105. The two pairs of material conveying roller shafts are horizontally arranged, and spline grooves are opened at one end of the shaft head for assembling transmission mechanisms such as gears, and are connected to the first box body 106 by bearings and nuts. The middle first guiding and limiting roller shaft 103 is vertically arranged and is connected to the bearing seat by bearings and nuts. The bearing seat is assembled to the first box body 106 by bolts and nuts. The entire first box body 106 is welded to the first base 107.

[0064] Usage method of this embodiment

[0065] In this embodiment, the metal wire is driven by an external rotary feeder to rotate clockwise and advance. The wire is brought into the first guiding and limiting roller shaft 103 as the first material conveying roller shaft 102 rotates, and continues to move forward to the second material conveying roller shaft 104. Under the combined action, the wire is conveyed from the first substrate outlet 105 to the substrate pretreatment and coiling integrated module 2.

[0066] Embodiment 3

[0067] Based on Embodiment 2, the continuous coiling graphene metal composite wire rolling and extrusion forming equipment provided in this embodiment is as Figure 3 As shown, the substrate pretreatment and coiling integrated module 2 includes a material guiding cover 201, a second substrate inlet 202, a degreasing hopper 203, a solid waste outlet 4, a horizontally arranged grinding tool 205, a vertically arranged grinding tool 206, a debris outlet 207, a powder stirring-in mechanism 208, a powder hopper 209, a coiling and extrusion integrated die 210, a second substrate outlet 211, a housing 212, a base 213, and a covering material inlet 214.

[0068] At the second base material inlet 202 of the base material pre-treatment and coiling integrated module 2, a material guiding cover 201 is assembled in a snap-fit manner. At the top of the side shell 212 on the side of the second base material inlet 202, a degreasing hopper 203 is equipped in a plug-in form. A horizontal grinding tool 205 and a vertical grinding tool 206 are assembled on the side and top of the shell 212 respectively. The grinding tools are assembled on the shell 212 in the form of bolts. A waste liquid discharge port 204 and a chip discharge port 207 are opened at the bottom of the side of the shell 212. On one side close to the second base material discharge port 211, a powder hopper 209 is assembled in a plug-in form. A powder stirring turbine is coaxially arranged in the powder hopper 209. The turbine is connected to a turbine shaft and fixed to a bearing bracket on the shell 212 in the form of bearings and nuts, forming an integral powder stirring mechanism 208. At the second base material discharge port 211 in the shell 212, a coiling and extrusion integrated die 210 is assembled in the form of bolts. The inner wall of the die is at an angle of 5° - 10° from the inner opening to the outer opening, preferably 5°. It extends to the intersection of the covering material inlet 214 and the second base material discharge port 211. Its shell 212 is welded to the base 213.

[0069] Usage method of this embodiment

[0070] In this embodiment, the metal wire is output from the first base material discharge port 105 and enters the material guiding cover 201. The wire passes through the material guiding cover 201 and enters the shell 212 through the second base material inlet 202. The surface grease and dirt are cleaned off by the degreasing liquid, and the waste degreasing liquid is discharged from the waste liquid discharge port 204. The wire continues to move forward and successively passes through the horizontal grinding tool 205 and the vertical grinding tool 206. The aluminum chips are discharged from the chip discharge port 207. The wire exposes a fresh and unoxidized surface. After passing through the second base material discharge port 211, the wire continues to be rotationally conveyed to the heat treatment module 4.

[0071] Embodiment 4

[0072] On the basis of Embodiment 2, the continuous coiling graphene-metal composite wire rolling and extrusion forming equipment provided in this embodiment, as Figure 4 shown, the covering material conveying and pre-treatment integrated module 3 includes a covering material inlet 301, a third material conveying roller shaft 302, a degreasing integrated chuck 303, a rough grinding chuck 304, a fine grinding chuck 305, a fourth material conveying roller shaft 306, a covering material discharge port 307, a second box body 308, a second base 309, and a solid-liquid waste collection box 310.

[0073] In the second box body 308 of the integrated module 3 for covering material conveying and pre-treatment, two pairs of material conveying roller shafts are arranged, horizontally placed and assembled in the second box body 308 in the form of bearings and nuts. A spline groove is opened at one end of the material conveying roller shaft for assembling transmission mechanisms such as gears. The third material conveying roller shaft 302 is close to the covering material inlet 301 side, and the fourth material conveying roller shaft 306 is close to the covering material outlet 307 side. Three clamping blocks are arranged at the middle position between the two pairs of material conveying roller shafts, and all are matched with the top cover of the second box body 308 in a plug-in form. The degreasing integrated clamping block 303 is close to the covering material inlet 301 side, with a flow channel opened inside and a degreasing liquid pipe connection port opened at the top. Next to the degreasing integrated block 3 is the rough grinding clamping block 304, and then the fine grinding clamping block 305. The solid-liquid waste collection box 310 is installed on the second base 309 in a pull-out form. The covering material outlet 307 is directly docked with the covering material inlet of the coiling and extrusion integrated module in the form of a connecting neck. The central axes of the two modules form a 45° angle, and the second box body 308 is welded to the second base 309.

[0074] Usage method of this embodiment

[0075] In this embodiment, a continuous thin plate-like covering material is fed into the covering material inlet 301 of the covering material conveying and pre-treatment module 3, conveyed to the degreasing integrated clamping block 303 via the first material conveying roller shaft 302, undergoes degreasing treatment and then immediately enters the rough grinding clamping block 304 and the fine grinding clamping block 305 to remove the oxide layer. The debris and waste liquid flow into the solid-liquid waste collection box 310. The pre-treated covering material is brought into the covering material outlet 307 by the second material conveying roller shaft 306 and then enters the covering material inlet 209 of the substrate pre-treatment and coiling integrated module 2.

[0076] Embodiment 5

[0077] On the basis of Embodiment 2, the continuous coiling graphene metal composite wire rolling and extrusion forming equipment provided in this embodiment is as Figure 5 shown. The heat treatment module 4 includes a first composite material inlet 401, a third box body 402, a heating wire groove 403, a composite material outlet 404, and a third base 405. Heating wire grooves 403 are opened in the two third box bodies 402 of the heat treatment module 4, fixed at the top with fine bolts and at the bottom with thick bolts. A wire groove for leading out the heating wire is opened in the thick threaded hole at the bottom. The entire third box body 402 is placed on the third base 405.

[0078] As Figure 6 and Figure 7As shown in the figure, the rotary swaging forming module 5 includes a hot composite material inlet 501, adjustable extrusion rollers 502, a fixed extrusion roller 503, a hot composite material outlet 504, a fourth box body 505, and a fourth base 506. There are 4 extrusion rollers arranged inside this module. Among them, three adjustable extrusion rollers 502 are longitudinally arranged in the fourth box body 505 in the form of bearings and bolts, and the bearing holes assembled with them are three-section calabash holes for conveniently adjusting the extrusion force and dimensions. The fixed extrusion roller 503 is welded to the fourth box body 505. The four extrusion rollers are parallel and opposed to each other. Among them, a gear structure is provided at the shaft head part of the adjustable extrusion roller 502 close to the fourth box body 505 to cooperate with the external power input. The fourth box body 505 is connected to the fourth base 506 by welding.

[0079] As Figure 8 shown, the material pulling module 6 includes a second composite material inlet 601, a primary material pulling roller shaft 602, a guiding and limiting roller shaft 603, a secondary material pulling roller shaft 604, a composite material outlet 605, a fifth box body 606, and a fifth base 607. A pair of primary material pulling roller shafts 602 are horizontally arranged near the second composite material inlet 601 of this module, and a pair of secondary material pulling roller shafts 604 are horizontally arranged at the composite material outlet 605. A spline groove is provided on one side of the roller shaft to assemble transmission mechanisms such as gears. The two pairs of shafts are connected to the fifth box body 606 in the form of bearings and nuts, and a pair of guiding and limiting roller shafts 603 are longitudinally arranged between these two pairs of shafts and are connected to the bearing seat by means of bearings and nuts. The bearing seat is assembled to the fifth box body 606 with bolts and nuts. The fifth box body 606 is welded to the fifth base 607.

[0080] The usage method of this embodiment

[0081] Taking pure aluminum wire, pure aluminum sheet, and graphene as examples, the gears on the drive shafts of the base material conveying module 1, the covering material pretreatment and conveying integrated module 3, the rotary swaging forming module 5, and the material pulling module 6 are respectively connected to the gearbox and the motor, and the pulley of the powder stirring mechanism in the base material pretreatment and winding module 2 is linked with a belt to the driving wheel.

[0082] Place the degreasing liquid delivery pipes at the inlets of the degreasing hopper 203 of the substrate pretreatment and coating integration module 2 and the degreasing integrated block 303 of the covering material pretreatment and delivery integration module 3 respectively. Fix the graphene powder feeding pipe at the powder hopper 209 of the substrate pretreatment and coating integration module 2. Turn on the power supplies of all drive motors and the degreasing liquid pump. Then, transfer the metal wire to the substrate inlet 1 of the substrate delivery module 1 and the covering material to the covering material inlet 301 of the covering material pretreatment and delivery integration module 3 respectively. The metal wire is driven by an external rotary feeder to rotate clockwise and move forward. It is transported by the substrate delivery module 1 to the substrate pretreatment and coating integration module 2, and after passing through the wire substrate pretreatment and coating integration module 2, it continues to rotate and is transported to the heat treatment module 4, the rolling extrusion forming module 5 until the pulling module 6. Under the action of the pulling module 6, the wire is straightened and the force is balanced.

[0083] At this time, the covering material delivery and pretreatment module 3 feeds a continuous thin plate-like covering material into the substrate pretreatment and coating integration module 2.

[0084] Meanwhile, the graphene powder brought in by the powder stirring mechanism 210 will spread on the surface of the covering material. The covering material contacts the clockwise rotating and advancing wire, and under the combined action of the extrusion force on the inner wall of the coating extrusion integrated die 211 and the frictional force of the wire rotating and advancing, it is coated with the graphene powder on the surface of the wire together and rotates forward to the outlet of the coating extrusion integrated die 211.

[0085] Under the action of rotational friction and extrusion deformation, the wire undergoes large plastic deformation, achieving effects such as grain refinement and strain strengthening. The graphene coated inside is evenly spread under the action of shear force and can produce thinner graphene layers. The thin plate heats up when undergoing friction and large deformation together with the wire, and mechanical bonding and metallurgical bonding occur among the three. The preliminarily bonded composite wire continues to rotate and advance to the heat treatment module 4 for on-line continuous heat treatment at 500 °C, and then immediately enters the rolling extrusion forming module 5 for secondary compaction. During the rolling extrusion forming process, friction and extrusion deformation occur again. After secondary compaction, the composite wire shows mostly metallurgical bonding. After passing through the pulling module 6, it can be sent to a coiler for bundling. The substrate and covering material of the composite wire form a large number of fine grains and ultrafine grains under the action of large deformation and torsional friction, greatly improving the strength. And the graphene evenly covering its surface can become an excellent conductive medium under the support of the skin effect theory, providing extremely high electrical conductivity. The outermost thin plate can protect the graphene interlayer, obtaining a composite wire with excellent performance, fine structure, high strength, high quality and high electrical conductivity.

[0086] The above-disclosed are only the preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A method for roll-extrusion forming of a continuous graphene-metal composite wire, characterized in that, The method includes: Driving the metal wire to move forward and rotating the metal wire to perform pre-treatment on the metal wire; Spreading graphene powder on the metal wire and winding a covering material on the metal wire to form a multi-layer structure wire; Extruding and rotating the multi-layer structure wire to cause the metal wire, graphene powder, and covering material to form a mechanical bond and a metallurgical bond, thereby forming a composite wire; Performing heat treatment on the composite wire; Performing secondary extrusion on the composite wire after heat treatment and then outputting it.

2. The continuous roll-coated graphene metal composite wire rolling and extrusion forming method according to claim 1, characterized in that The method for pre-treating the metal wire includes cleaning the metal wire, degreasing the metal wire, grinding the surface of the metal wire, and removing the oxide layer on the surface of the metal wire.

3. The continuous roll-coated graphene metal composite wire rolling and extrusion forming method according to claim 1, characterized in that Before winding the covering material, degrease the covering material, grind the surface of the covering material, and remove the oxide layer on the surface of the covering material.

4. Continuous roll-coating graphene-metal composite wire rolling and extrusion forming equipment, characterized in that When in use, the device executes the method according to any one of claims 1-3.

5. The continuous roll-coating graphene metal composite wire rolling and extrusion forming equipment according to claim 4, characterized in that, The device includes a substrate pre-treatment and winding integrated module (2). The substrate pre-treatment and winding integrated module (2) includes a housing (212). A second substrate inlet (202) is provided on one side of the housing (212), and an outlet (211) is provided on the other side. A grinding part is arranged inside the housing (212). A covering material inlet (214) is provided on the housing (212). The covering material inlet (214) is located between the grinding part and the outlet (211). A powder stirring mechanism (208) is provided at the top of the housing (212). The powder stirring mechanism (208) has a powder outlet. The covering material inlet (214) is located between the powder outlet and the outlet (211). A winding and extrusion integrated die (210) is arranged inside the housing (212). The winding and extrusion integrated die (210) is arranged between the powder outlet and the outlet (211).

6. The continuous roll-coated graphene metal composite wire rolling and extrusion forming equipment according to claim 5, characterized in that, The winding and extrusion integrated die (210) includes an extrusion channel. One side of the extrusion channel has a first center line. The inlet of the extrusion channel is larger than the outlet, and there is a connecting line between the inlet and the outlet. The angle between the connecting line and the first center line is set to 5°-10°.

7. The continuous roll-coated graphene metal composite wire rolling and extrusion forming equipment according to claim 5, characterized in that, The housing (212) is connected to a covering material inlet channel. The covering material inlet channel is communicated with the covering material inlet (214). The covering material inlet channel has a second center line. The angle between the second center line and the first center line is set to 45°-55°.

8. The continuous roll-coating graphene metal composite wire rolling and extruding forming equipment according to claim 5, characterized in that, The grinding part includes a horizontally arranged grinding tool (205) and a vertically arranged grinding tool (206). The horizontally arranged grinding tool (205) is fixedly arranged on one side inside the housing (212). The vertically arranged grinding tool (206) is arranged on the inner top of the housing (212). A debris outlet (207) is provided at the bottom of the housing (212).

9. The continuous roll-coated graphene metal composite wire rolling and extrusion forming equipment according to claim 5, wherein, Above the said housing (212), there is a degreasing hopper (203). The bottom outlet of the degreasing hopper (203) is communicated with the housing (212), and the outlet of the degreasing hopper (203) is located between the second substrate inlet (202) and the grinding part.

10. The continuous roll-coated graphene metal composite wire rolling and extrusion forming equipment according to claim 5, characterized in that, The said powder stirring mechanism (208) includes a powder hopper (209). The powder hopper (209) is arranged above the housing (212), and a turbine is arranged in the powder hopper (209).

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