Device and method for laser and pulse current synergistic preparation of dissimilar metal plate strip

Abstract

The application relates to the technical field of preparation of dissimilar metal composite plate strips, and proposes a device and a method for cooperatively preparing dissimilar metal plate strips through laser and pulse current, which comprises a laser-pulse current composite rolling mechanism, a rolling mill feeding mechanism, a laser, a pulse current applying mechanism and the like.Two dissimilar metal plate strips are transported to the laser-pulse current composite rolling mechanism through the rolling mill feeding mechanism, and the rolling mill feeding mechanism can adjust the transport angle of the two dissimilar metal plate strips, the plate tension and the misalignment degree of the two dissimilar metal plate strips according to actual needs through two tensioning devices.The composite effect of laser pulses and electric current makes the two different metal materials well combined at the micro level.The production of double-layer composite dissimilar metal plates with high precision and high efficiency is realized, and the application prospect is important.The composite metal plate strips which are lighter, stronger and more durable can be produced, and the demand for high-strength and high-performance materials can be met.

Description

Technical Field

[0001] This invention relates to the field of dissimilar metal composite strip preparation technology, specifically to an apparatus and method for preparing dissimilar metal strips using laser and pulsed current synergistic methods. Background Technology

[0002] With the increasing demand for high-performance, multifunctional metallic materials in engineering and manufacturing, double-layer dissimilar metal composite plates and strips have become a highly sought-after option. These composite plates can fully utilize the advantages of various metallic materials to meet the specific requirements of different application scenarios and achieve varying material performance requirements. Laser technology has made significant progress in materials processing; its high precision and localized heating capabilities make it a powerful tool for preparing dissimilar metal composite plates. Lasers can achieve precise heating and melting of materials, helping to improve interfacial bonding and material properties. Pulsed current co-rolling is an emerging metal processing technology that combines current and rolling processes. It can introduce localized heating and stress on the material surface, thereby affecting the material's structure and properties. This technology provides a new approach for the preparation of dissimilar metal composite plates.

[0003] Traditional methods for preparing bilayer dissimilar metal composite plates face several limitations, including interface issues, material waste, high energy consumption, and high cost. First, integrating laser and pulsed current heat sources requires precise process control, including heat input, rolling speed, and current parameters, to ensure metal layer uniformity and interface quality. Second, intermetallic interface treatment is crucial, necessitating the removal of impurities such as oxides to guarantee high bonding strength. Furthermore, material selection and compatibility are challenging, requiring consideration of the differences in properties among different metals to ensure alloy layer stability. Researching thermo-mechanical coupling effects and microstructure properties also presents challenges. Energy efficiency and cost are critical issues, and integrating materials science and engineering knowledge is essential for optimizing processes and improving performance. Therefore, a new and more efficient method is needed to overcome these limitations.

[0004] In view of this, the present invention proposes an apparatus and method for the synergistic preparation of dissimilar metal strips using laser and pulsed current. Summary of the Invention

[0005] This invention proposes an apparatus and method for the synergistic preparation of dissimilar metal strips using laser and pulsed current, which solves the problems of low production efficiency, high energy consumption and high cost, and weak interfacial bonding performance in the rolling process of metal composite strips in related technologies.

[0006] The technical solution of the present invention is as follows: an apparatus for the synergistic fabrication of dissimilar metal strips using laser and pulsed current, comprising:

[0007] A laser-pulsed current composite rolling mechanism is used to composite two dissimilar metal sheets and strips.

[0008] The mill feeding mechanism is located on one side of the laser-pulse current composite rolling mechanism and is used to adjust the placement angle of the two dissimilar metal strips and to transport the two dissimilar metal strips into the laser-pulse current composite rolling mechanism.

[0009] A laser is positioned between the mill feeding mechanism and the laser-pulse current composite rolling mechanism to emit a laser path towards the intersection of two dissimilar metal strips in the laser-pulse current composite rolling mechanism.

[0010] The protective gas nozzle is located on one side of the laser-pulse current composite rolling mechanism and is connected to an external protective gas generator. It is used to deliver protective gas to the junction of two dissimilar metal strips and to provide the required atmosphere for the rolling environment.

[0011] There are three pulse current application mechanisms. The three pulse current application mechanisms are respectively sleeved on the two metal strips in the separated state and on the outside of the two metal strips after being combined by the laser-pulse current composite rolling mechanism.

[0012] Preferably, the mill feeding mechanism includes two bases, each with a vertical guide rail. The two sets of vertical guide rails are arranged in parallel, and each vertical guide rail has two sets of vertical self-locking sliders installed on it. The two sets of vertical self-locking sliders are slidably and self-lockingly mounted on the vertical guide rails. Between the two sets of vertical guide rails, there are two sets of horizontal guide rails arranged in parallel. Both ends of the horizontal guide rails are detachably fixed to the vertical self-locking sliders on the vertical guide rails via connectors. A horizontal self-locking slider is provided on each horizontal guide rail, and it is slidably and self-lockingly mounted on the horizontal guide rail. Each set of horizontal self-locking sliders has a tensioning device, which is detachably fixed to the horizontal self-locking slider via a connecting bracket. Each of the four corners of the base has a height-adjustable support foot for adjusting the height of the base.

[0013] Preferably, the tensioning device includes an upper substrate and a lower substrate arranged in parallel. Two vertical bearing seats are detachably fixed between the inner walls of the upper substrate and the lower substrate by bolts. An upper roller is rotatably connected between the two vertical bearing seats on the upper substrate, and a lower roller is rotatably connected between the two vertical bearing seats on the lower substrate. Two parallel lead screws are symmetrically connected between the upper substrate and the lower substrate. The lead screws are detachably bolted through the upper substrate and the lower substrate. A long slot is formed through the lower substrate, and two parallel limiting rods are detachably fixed inside the long slot by bolts.

[0014] Preferably, the laser-pulse current composite rolling mechanism includes a main structure, a pressure-applying component disposed inside the main structure, an mounting component disposed on the main structure for mounting the pressure-applying component, a transmission component disposed outside the mounting component and connected to the pressure-applying component, a drive motor disposed on the main structure for driving the transmission component, and a lifting adjustment component disposed on the main structure for adjusting the pressing thickness of the pressure-applying component.

[0015] Preferably, the main structure includes a top plate, a middle plate, and a bottom plate, which are arranged sequentially from top to bottom and are parallel to each other. Four columns are fixedly connected between the top plate and the bottom plate.

[0016] Preferably, the mounting component includes a first bearing seat and a second bearing seat fixed parallel to the top of the base plate, and a shaft bracket is provided on the upper side of both the first bearing seat and the second bearing seat. The two shaft brackets are detachably fixed to the bottom of the middle plate by bolts, and a suspension bearing seat is fixed to the bottom of both shaft brackets.

[0017] The pressure-applying component includes a first roller and a second roller arranged in parallel. The first roller is rotatably connected between two suspension bearing seats, and the second roller is rotatably connected between the first bearing seat and the second bearing seat.

[0018] Preferably, the lifting adjustment component includes four guide rails, which are detachably fixed to four columns by bolts. The four guide rails slide through the four corners of the middle plate. A pressure sensor is provided on each side of the top of the middle plate directly above the first roller. A flange is fixed to each of the two pressure sensors. A screw is rotatably connected to the upper end of each of the two flanges. The screw passes through the interior of the top plate and is threaded to it. A handwheel is fixed to the top of the screw. A hydraulic device is connected between the top plate and the middle plate.

[0019] Preferably, the transmission component includes a first large gear rotatably connected to the side wall of the suspension bearing seat and a second large gear rotatably connected to the side wall of the first bearing seat. The second large gear is connected to the output shaft of the drive motor via a coupling. The first large gear is coaxially arranged with the first roller, and the second large gear is coaxially arranged with the second roller.

[0020] The transmission component further includes a first pinion, a second pinion, a third pinion, and a fourth pinion, which are arranged sequentially from bottom to top. Adjacent pinions mesh with each other, the fourth pinion meshes with the first large gear, and the first pinion meshes with the second large gear.

[0021] A shaft is rotatably mounted at the center of each of the first, second, third, and fourth pinions. The shaft on the fourth pinion is fixedly connected to a shaft frame. The shafts on the first and second pinions are both connected to the first bearing seat. Connecting rods are hinged between the rear side of the shaft on the fourth pinion and the shaft on the third pinion, and between the front side of the shaft on the third pinion and the shaft on the second pinion.

[0022] Preferably, the pulse current application mechanism includes an outer frame, with two rollers rotatably connected inside the outer frame. Inside each roller is a water channel for coolant circulation. Two coolant inlets, each connected to the water channel inside the two rollers, are provided on one side wall of the outer frame. Two coolant outlets, each connected to the water channel inside the two rollers, are provided on the outer wall of the outer frame opposite to the coolant inlets. Two control terminals are provided at the bottom of the outer frame; these terminals are a circuit control terminal and a current input terminal, respectively, and are connected to an external controller.

[0023] A method for synergistically preparing dissimilar metal strips using laser and pulsed current, employing any of the apparatuses for synergistically preparing dissimilar metal strips as described in the preceding claims, characterized by comprising the following steps:

[0024] S1: Using a pre-processing device for metal coils, preferably an uncoiler, to unwind, flatten, or cut the metal coil material for further processing or use;

[0025] S2: The oxide layer and impurities on the surface of the metal sheet are removed by the metal sheet surface treatment device, and the roughness of the metal sheet is changed, thereby further improving the interfacial bonding strength.

[0026] S3: The processed two dissimilar metal strips are fed into the laser-pulse current composite rolling mechanism through the mill feeding mechanism. The tensioning device on the mill feeding mechanism can move freely up, down, left, and right on the same vertical plane through a combination of vertical guide rails, vertical self-locking sliders, horizontal guide rails, and horizontal self-locking sliders. This allows the two tensioning devices to adjust the conveying angle, tension, and misalignment of the two dissimilar metal strips according to actual needs.

[0027] S4: When two dissimilar metal strips enter the laser-pulse current composite rolling mechanism, the protective gas nozzle is connected to the external protective gas generator. The protective gas nozzle is used to deliver protective gas to the junction of the two dissimilar metal strips to provide the required atmosphere for the rolling environment.

[0028] S5: A laser path is emitted at the intersection of two dissimilar metal strips by a laser. Under the action of the laser as a heat source to melt the surface of the metal strips, a pulse current is applied to the metal strips by a pulse current application mechanism, and the two dissimilar metal strips are pressed and composited by the first roller and the second roller.

[0029] The working principle and beneficial effects of this invention are as follows:

[0030] 1. This invention combines multiple technologies to provide a novel method for the production of double-layer composite dissimilar metal sheets. It utilizes the combined effect of laser pulses and electric current to effectively achieve the composite of dissimilar metal sheets and strips, enabling a strong bond between the two different metal materials at the microscopic level. This achieves high-precision and high-efficiency production of double-layer composite dissimilar metal sheets, with significant application prospects, particularly in automotive manufacturing, aerospace, and other engineering fields. It can produce lighter, stronger, and more durable composite metal sheets and strips, meeting the demand for high-strength, high-performance materials.

[0031] 2. This invention enables precise parameter control, allowing for accurate adjustment of the thickness, size, and shape of the metal sheet. By using laser technology to locally heat the metal, the material's plasticity is improved, making it easier to roll and deform, thus facilitating the manufacture of high-strength, high-toughness materials. Compared to traditional rolling methods, this invention reduces heat loss and energy consumption because the laser can heat the material more precisely. Furthermore, compared to traditional metal sheet and strip manufacturing methods, this invention utilizes laser technology and electric current, along with precise laser-pulse current control and improved energy efficiency, which can reduce production costs and minimize waste and resource waste.

[0032] 3. In this invention, the laser-pulsed current composite rolling device has a high degree of automation, enabling continuous and stable production without waiting for heating or cooling processes. This is highly advantageous for industrial production lines, allowing for rapid and continuous production, thereby improving production efficiency and meeting market demands more quickly. Traditional double-layer metal sheet and strip manufacturing typically requires multiple processing steps, while the laser-pulsed current composite rolling device integrates multiple processes into one unit, significantly reducing production steps and improving production efficiency. Attached Figure Description

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0034] Figure 1 This is a schematic diagram of the device structure for the synergistic fabrication of dissimilar metal strips using laser and pulsed current, as proposed in this invention.

[0035] Figure 2This is a schematic diagram of the structural composition of the rolling mill feeding mechanism proposed in this invention;

[0036] Figure 3 This is a schematic diagram of the structure of the tensioning device proposed in this invention;

[0037] Figure 4 This is a schematic diagram of the structure of the laser-pulse current composite rolling mechanism proposed in this invention;

[0038] Figure 5 This is a schematic diagram of the structural composition of the transmission component and mounting component proposed in this invention;

[0039] Figure 6 This is a schematic diagram of the pulse current application mechanism proposed in this invention;

[0040] Figure 7 This is a schematic diagram illustrating the working principle of using pulsed current to further process rolled dissimilar metal composite sheets, as proposed in this invention.

[0041] In the diagram: 1. Mill feeding mechanism; 11. Support foot; 12. Vertical guide rail; 13. Base; 14. Vertical self-locking slider; 15. Connecting component; 16. Horizontal guide rail; 17. Horizontal self-locking slider; 18. Tensioning device; 181. Upper base plate; 182. Lower base plate; 183. Upper roller; 184. Lower roller; 185. Vertical bearing seat; 186. Lead screw; 187. Long slot; 188. Limiting bar; 19. Connecting frame; 2. Pulse current application mechanism; 21. Outer frame; 22. Roller; 23. Coolant inlet; 24. Coolant outlet; 25. Control terminal; 3. Metal strip; 4. Laser; 41. Laser path; 5. Protective gas nozzle; 6. Laser-pulse current composite rolling mechanism; 61. Main structure; 611. Top plate; 612. Middle plate; 613. Bottom plate; 614. Column; 62. Pressure application component; 621. First roller; 622. Second roller; 63. Drive motor; 64. Transmission component; 641. First large gear; 642. Second large gear; 643. Coupling; 644. Connecting rod; 645. First small gear; 646. Second small gear; 647. Third small gear; 648. Fourth small gear; 65. Lifting and adjusting component; 651. Handwheel; 652. Screw; 653. Hydraulic device; 654. Guide rail; 655. Flange; 656. Pressure sensor; 66. Mounting component; 661. First bearing seat; 662. Second bearing seat; 663. Shaft bracket; 664. Suspension bearing seat. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] Please see Figure 1 An apparatus and method for the synergistic preparation of dissimilar metal strips using laser and pulsed current are disclosed, comprising: a laser-pulsed current composite rolling mechanism 6, a mill feeding mechanism 1, a laser 4, a protective gas nozzle 5, and a pulsed current application mechanism 2. During the composite processing, firstly, a pre-prepared pre-treatment device for metal coils, preferably an uncoiler, is used to unwind, level, or shear the metal coil material for further processing or use. Then, a pre-prepared surface treatment device for metal sheets removes oxide layers, impurities, etc., from the surface of the metal sheet and alters its roughness, thereby further improving the interfacial bonding strength. The two dissimilar metal strips 3 are then conveyed into the laser-pulsed current composite rolling mechanism 6 via the mill feeding mechanism 1. When the two dissimilar metal strips 3 enter the laser-pulsed current composite rolling mechanism 6, the protective gas nozzle 5 is connected to an external protective gas generator. The protective gas nozzle 5 is used to deliver protective gas to the junction of the two dissimilar metal strips 3, providing the necessary atmosphere for the rolling environment. Laser path 41 is emitted at the intersection of two dissimilar metal strips 3 by laser 4. Under the action of the laser as a heat source to melt the surface of the metal strip, pulse current is applied to the metal strip 3 by pulse current application mechanism 2, and the two dissimilar metal strips 3 are pressed and composite by laser-pulse current composite rolling mechanism 6.

[0044] For details, please refer to Figure 1 , Figure 2 as well as Figure 3The mill feeding mechanism 1 is located on one side of the laser-pulse current composite rolling mechanism 6. It is used to adjust the placement angle of the two dissimilar metal strips 3 and to transport the two dissimilar metal strips 3 into the laser-pulse current composite rolling mechanism 6. The mill feeding mechanism 1 includes two bases 13, each with a vertical guide rail 12. The two sets of vertical guide rails 12 are arranged in parallel, and each vertical guide rail 12 is equipped with two sets of vertical self-locking sliders 14. The two sets of vertical self-locking sliders 14 are self-lockingly slidable on the vertical guide rails 12, meaning they can move up and down on the vertical guide rails 12 and can be locked where needed. Between the two sets of vertical guide rails 12, two sets of horizontal guide rails 16 are arranged parallel to each other. Both ends of the horizontal guide rails 16 are detachably fixed to the connecting parts 15. On the vertical self-locking slider 14 on the vertical guide rail 12, a horizontal self-locking slider 17 is provided on the horizontal guide rail 16. The horizontal self-locking slider 17 is slidably and self-lockingly mounted on the horizontal guide rail 16, that is, it can move left and right on the horizontal guide rail 16 and can be locked where needed. Each set of horizontal self-locking sliders 17 is provided with a tensioning device 18. The tensioning device 18 is detachably fixed to the horizontal self-locking slider 17 through the connecting bracket 19. At each of the four corners of the base 13, a height-adjustable support foot 11 is provided for adjusting the height of the base 13.

[0045] The tensioning device 18 includes an upper substrate 181 and a lower substrate 182 arranged in parallel. Two vertical bearing seats 185 are detachably fixed between the inner walls of the upper substrate 181 and the lower substrate 182 by bolts. An upper roller 183 is rotatably connected between the two vertical bearing seats 185 on the upper substrate 181, and a lower roller 184 is rotatably connected between the two vertical bearing seats 185 on the lower substrate 182. Two parallel lead screws 186 are symmetrically connected between the upper substrate 181 and the lower substrate 182. The lead screws 186 are detachably bolted through the upper substrate 181 and the lower substrate 182. A long slot 187 is formed through the lower substrate 182. Two parallel limiting rods 188 are detachably fixed inside the long slot 187 by bolts. Adjusting the position of the bolt on the lead screw 186 controls the distance between the upper substrate 181 and the lower substrate 182, thereby adjusting the gap between the upper roller 183 and the lower roller 184 to accommodate plates of different thicknesses. Two limit bars 188, in conjunction with the elongated slot 187 on the lower substrate 182, control the direction of the plate entering the laser-pulse current composite rolling mechanism 6. Two tensioning devices 18 adjust the conveying angle of the two dissimilar metal strips 3, the tension of the plate, and the degree of misalignment between the two dissimilar metal strips 3.

[0046] For further details, please refer to Figure 4 and Figure 5The laser-pulse current composite rolling mechanism 6 includes a main structure 61, a pressure-applying component 62 disposed inside the main structure 61, a mounting component 66 disposed on the main structure 61 for mounting the pressure-applying component 62, a transmission component 64 disposed outside the mounting component 66 and connected to the pressure-applying component 62, a drive motor 63 disposed on the main structure 61 for driving the transmission component 64, and a lifting adjustment component 65 disposed on the main structure 61 for adjusting the pressing thickness of the pressure-applying component 62.

[0047] The main structure 61 includes a top plate 611, a middle plate 612, and a bottom plate 613, which are arranged sequentially from top to bottom and are parallel to each other. Four columns 614 are fixedly connected between the top plate 611 and the bottom plate 613. The mounting component 66 includes a first bearing seat 661 and a second bearing seat 662 fixed parallel to the top of the bottom plate 613. A shaft bracket 663 is provided on the upper side of the first bearing seat 661 and the second bearing seat 662. The two shaft brackets 663 are detachably fixed to the bottom of the middle plate 612 by bolts. A suspension bearing seat 664 is fixed to the bottom of the two shaft brackets 663. The pressure-applying component 62 includes a first roller 621 and a second roller 622 arranged in parallel. The first roller 621 is rotatably connected between two suspension bearing seats 664, and the second roller 622 is rotatably connected between the first bearing seat 661 and the second bearing seat 662.

[0048] The lifting adjustment component 65 includes four guide rails 654, which are detachably fixed to four columns 614 by bolts. The four guide rails 654 slide through the four corners of the middle plate 612. A pressure sensor 656 is set on each side of the top of the middle plate 612, which is directly above the first roller 621. A flange 655 is fixed to each of the two pressure sensors 656. A screw 652 is rotatably connected to the upper end of each of the two flanges 655. The screw 652 passes through the interior of the top plate 611 and is threaded to it. A handwheel 651 is fixed to the top of the screw 652. A hydraulic device 653 is connected between the top plate 611 and the middle plate 612. Rotating the handwheel 651 drives the screw 652 to rotate, causing it to rise and fall on the top plate 611. This adjusts the height of the middle plate 612, thereby moving the first roller 621 up and down. During this process, the pressure sensor 656 records the downward pressure on the first roller 621 in real time and displays it on a computer via an external monitor. The hydraulic device 653 is connected to the top plate 611 at the top and to the middle plate 612 at the bottom. When greater downward pressure is required, the hydraulic device 653 can be activated to provide additional rolling pressure to the first roller 621.

[0049] The transmission component 64 includes a first large gear 641 rotatably connected to the side wall of the suspension bearing housing 664 and a second large gear 642 rotatably connected to the side wall of the first bearing housing 661. The second large gear 642 is connected to the output shaft of the drive motor 63 via a coupling 643. The first large gear 641 is coaxially arranged with the first roller 621, and the second large gear 642 is coaxially arranged with the second roller 622. The transmission component 64 also includes a first small gear 645, a second small gear 646, a third small gear 647, and a fourth small gear 648, arranged sequentially from bottom to top. Adjacent small gears mesh with each other. The fourth small gear 648 meshes with the first large gear 641, and the first small gear 645 meshes with the second large gear 642. A shaft is rotatably mounted at the center of each of the first pinion 645, the second pinion 646, the third pinion 647, and the fourth pinion 648. The shaft on the fourth pinion 648 is fixedly connected to the shaft bracket 663. The shafts on the first pinion 645 and the second pinion 646 are both connected to the first bearing seat 661. A connecting rod 644 is hinged between the shaft on the fourth pinion 648 and the rear side of the shaft on the third pinion 647, and between the shaft on the third pinion 647 and the front side of the shaft on the second pinion 646.

[0050] The drive motor 63 is started, and it drives the second large gear 642 to rotate via the coupling 643. Under the action of the first small gear 645, second small gear 646, third small gear 647, and fourth small gear 648, the power of the drive motor 63 is transmitted to the first large gear 641. These four small gears are of the same size, and based on their gear ratios, the angular velocities of the second large gear 642 and the first large gear 641 are the same but opposite in direction, ensuring the synchronous movement of the first roller 621 and the second roller 622 with the same angular velocity but opposite direction. Under the action of the two connecting rods 644, during the lifting and lowering of the middle plate 612, the two connecting rods 644 change the included angle between them to ensure that adjacent small gears are in a meshing state.

[0051] It should be noted that you should refer to [link / reference]. Figure 1 , Figure 6 as well as Figure 7A laser 4 is positioned between the mill feeding mechanism 1 and the laser-pulse current composite rolling mechanism 6, and is used to emit a laser path 41 at the junction of the two dissimilar metal strips 3 within the laser-pulse current composite rolling mechanism 6. A protective gas nozzle 5 is positioned on one side of the laser-pulse current composite rolling mechanism 6 and connected to an external protective gas generator, used to deliver protective gas to the junction of the two dissimilar metal strips 3, providing the necessary atmosphere for the rolling process. Three pulse current application mechanisms 2 are provided, respectively fitted onto the two metal strips 3 in their separated state and onto the outer sides of the two metal strips 3 after being combined by the laser-pulse current composite rolling mechanism 6. The pulse current application mechanism 2 includes an outer frame 21, with two rollers 22 rotatably connected inside the outer frame 21. Inside the rollers 22, there is a water channel for coolant circulation. On one side wall of the outer frame 21, there are two coolant inlets 23 that are respectively connected to the water channels inside the two rollers 22. On the outer wall of the outer frame 21 opposite to the coolant inlets 23, there are two coolant outlets 24 that are respectively connected to the water channels inside the two rollers 22. At the bottom of the outer frame 21, there are two control terminals 25, which are a circuit control terminal and a current input terminal, respectively. The control terminals 25 are connected to an external controller.

[0052] like Figure 7 As shown, the assembly includes electrodes, clamping devices, wires, and a controller. A set of clamping devices holds the strip at both ends. These clamping devices, acting as electrodes, are connected to the controller via wires. The controller controls the magnitude and density of the pulsed current; this step further improves the mechanical properties of the dissimilar metal interface bonding. (Reference) Figure 1 and Figure 6 Three pulse current application mechanisms 2 are respectively sleeved on the two metal strips 3 in the separated state and on the outside of the two metal strips 3 after being combined by the laser-pulse current composite rolling mechanism 6, serving as electrodes for the pulse current. Different energizing methods can be selected according to different materials; for example, the upper metal strip 3 can form a current path with the rear end of the formed composite material, or the lower metal strip 3 can form a current path with the rear end of the formed composite material. The usage of the pulse current application mechanism 2 is adjusted according to the combination of parameters such as the thickness and type of the material, the rolling force, and the laser power.

[0053] Working principle and usage process: Using a pre-prepared pre-processing device for metal coils, preferably an uncoiler, the metal coil material is unrolled, leveled, or sheared for further processing or use. A pre-prepared surface treatment device for metal sheets removes oxide layers and impurities from the surface of the metal sheet and alters its roughness, thereby further improving the interfacial bonding strength. The treated two dissimilar metal strips 3 are conveyed to the laser-pulse current composite rolling mechanism 6 via the mill feeding mechanism 1. The tensioning device 18 on the mill feeding mechanism 1, through a combination of a vertical guide rail 12, a vertical self-locking slider 14, a horizontal guide rail 16, and a transverse self-locking slider 17, can move arbitrarily up, down, left, and right on the same vertical and horizontal plane. This allows for adjustment of the conveying angle, sheet tension, and misalignment of the two dissimilar metal strips 3 according to actual needs via the two tensioning devices 18. When the two dissimilar metal strips 3 enter the laser-pulse current composite rolling mechanism 6, the protective gas nozzle 5 is connected to an external protective gas generator. The protective gas nozzle 5 is used to deliver protective gas to the junction of the two dissimilar metal strips 3, providing the necessary atmosphere for the rolling environment. The laser 4 emits a laser path 41 at the junction of the two dissimilar metal strips 3. Under the action of the laser as a heat source to melt the surface of the metal sheet, the pulse current application mechanism 2 applies a pulse current to the metal strips 3, and the two dissimilar metal strips 3 are pressed and composited by the first roller 621 and the second roller 622.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An apparatus for the synergistic fabrication of dissimilar metal strips using laser and pulsed current, characterized in that, include: A laser-pulse current composite rolling mechanism (6) is used to composite two dissimilar metal strips (3); The mill feeding mechanism (1) is located on one side of the laser-pulse current composite rolling mechanism (6) and is used to adjust the placement angle of the two dissimilar metal strips (3) and to transport the two dissimilar metal strips (3) to the laser-pulse current composite rolling mechanism (6). A laser (4) is positioned between the mill feeding mechanism (1) and the laser-pulse current composite rolling mechanism (6) to emit a laser path (41) to the intersection of two dissimilar metal strips (3) in the laser-pulse current composite rolling mechanism (6). The protective gas nozzle (5) is located on one side of the laser-pulse current composite rolling mechanism (6) and connected to the external protective gas generator. It is used to deliver protective gas to the junction of the two dissimilar metal strips (3) and provide the required atmosphere for the rolling environment. There are three pulse current application mechanisms (2). The three pulse current application mechanisms (2) are respectively sleeved on the two metal strips (3) in the separated state and on the outside of the two metal strips (3) after being combined by the laser-pulse current composite rolling mechanism (6).

2. The apparatus for the synergistic fabrication of dissimilar metal sheets and strips using laser and pulsed current according to claim 1, characterized in that, The mill feeding mechanism (1) includes two bases (13), each of which is provided with a vertical guide rail (12). The two sets of vertical guide rails (12) are arranged in parallel, and each of the vertical guide rails (12) is equipped with two sets of vertical self-locking sliders (14). The two sets of vertical self-locking sliders (14) are slidably and self-lockingly mounted on the vertical guide rails (12). Between the two sets of vertical guide rails (12) are two sets of horizontal guide rails (16) arranged in parallel to each other. Both ends of the horizontal guide rails (16) are detachably fixed to the vertical guide rails (15) by connectors (15). On the vertical self-locking slider (14) on the straight guide rail (12), a horizontal self-locking slider (17) is provided on the horizontal guide rail (16). The horizontal self-locking slider (17) is slidably and self-lockingly mounted on the horizontal guide rail (16). Each set of horizontal self-locking sliders (17) is provided with a tensioning device (18). The tensioning device (18) is detachably fixed to the horizontal self-locking slider (17) through a connecting frame (19). At each of the four corners of the base (13), a height-adjustable support foot (11) is provided for adjusting the height of the base (13).

3. The apparatus for the synergistic fabrication of dissimilar metal strips using laser and pulsed current according to claim 2, characterized in that, The tensioning device (18) includes an upper base plate (181) and a lower base plate (182) arranged in parallel. Two vertical bearing seats (185) are detachably fixed between the inner walls of the upper base plate (181) and the lower base plate (182) by bolts. An upper roller (183) is rotatably connected between the two vertical bearing seats (185) on the upper base plate (181), and a lower roller (184) is rotatably connected between the two vertical bearing seats (185) on the lower base plate (182). Two parallel lead screws (186) are symmetrically connected between the upper base plate (181) and the lower base plate (182). The lead screws (186) are detachably bolted between the upper base plate (181) and the lower base plate (182). A long slot (187) is opened through the lower base plate (182). Two parallel limiting rods (188) are detachably fixed inside the long slot (187) by bolts.

4. The apparatus for the synergistic fabrication of dissimilar metal sheets and strips using laser and pulsed current according to claim 1, characterized in that, The laser-pulse current composite rolling mechanism (6) includes a main structure (61), a pressure-applying component (62) disposed inside the main structure (61), an installation component (66) disposed on the main structure (61) for mounting the pressure-applying component (62), a transmission component (64) disposed outside the installation component (66) and connected to the pressure-applying component (62), a drive motor (63) disposed on the main structure (61) for driving the transmission component (64), and a lifting adjustment component (65) disposed on the main structure (61) for adjusting the pressing thickness of the pressure-applying component (62).

5. The apparatus for the synergistic fabrication of dissimilar metal sheets and strips using laser and pulsed current according to claim 4, characterized in that, The main structure (61) includes a top plate (611), a middle plate (612) and a bottom plate (613). The top plate (611), the middle plate (612) and the bottom plate (613) are arranged sequentially from top to bottom, and the top plate (611), the middle plate (612) and the bottom plate (613) are parallel to each other. Four columns (614) are fixedly connected between the top plate (611) and the bottom plate (613).

6. The apparatus for the synergistic fabrication of dissimilar metal sheets and strips using laser and pulsed current according to claim 5, characterized in that, The mounting component (66) includes a first bearing seat (661) and a second bearing seat (662) fixed parallel to the top of the base plate (613). A shaft bracket (663) is provided on the upper side of the first bearing seat (661) and the second bearing seat (662). The two shaft brackets (663) are detachably fixed to the bottom of the middle plate (612) by bolts. A suspension bearing seat (664) is fixed to the bottom of the two shaft brackets (663). The pressure-applying component (62) includes a first roller (621) and a second roller (622) arranged in parallel. The first roller (621) is rotatably connected between two suspension bearing seats (664), and the second roller (622) is rotatably connected between the first bearing seat (661) and the second bearing seat (662).

7. The apparatus for the synergistic fabrication of dissimilar metal sheets and strips using laser and pulsed current according to claim 6, characterized in that, The lifting adjustment component (65) includes four guide rails (654). The four guide rails (654) are detachably fixed to four columns (614) by bolts. The four guide rails (654) slide through the four corners of the middle plate (612). A pressure sensor (656) is provided on both sides of the top of the middle plate (612) located directly above the first roller (621). A flange (655) is fixed to each of the two pressure sensors (656). A screw (652) is rotatably connected to the upper end of each of the two flanges (655). The screw (652) passes through the inside of the top plate (611) and is threaded to it. A handwheel (651) is fixed to the top of the screw (652). A hydraulic device (653) is connected between the top plate (611) and the middle plate (612).

8. The apparatus for the synergistic fabrication of dissimilar metal sheets and strips using laser and pulsed current according to claim 7, characterized in that, The transmission component (64) includes a first large gear (641) rotatably connected to the side wall of the suspension bearing seat (664) and a second large gear (642) rotatably connected to the side wall of the first bearing seat (661). The second large gear (642) is connected to the output shaft of the drive motor (63) through a coupling (643). The first large gear (641) is coaxially arranged with the first roller (621), and the second large gear (642) is coaxially arranged with the second roller (622). The transmission component (64) further includes a first pinion (645), a second pinion (646), a third pinion (647), and a fourth pinion (648). The first pinion (645), the second pinion (646), the third pinion (647), and the fourth pinion (648) are arranged sequentially from bottom to top. Adjacent pinions mesh with each other. The fourth pinion (648) meshes with the first large pinion (641), and the first pinion (645) meshes with the second large pinion (642). A shaft is rotatably sleeved at the center of the first pinion (645), the second pinion (646), the third pinion (647), and the fourth pinion (648). The shaft on the fourth pinion (648) is fixedly connected to the shaft bracket (663). The shafts on the first pinion (645) and the second pinion (646) are both connected to the first bearing seat (661). A connecting rod (644) is hinged between the shaft on the fourth pinion (648) and the rear side of the shaft on the third pinion (647), and between the shaft on the third pinion (647) and the front side of the shaft on the second pinion (646).

9. The apparatus for the synergistic fabrication of dissimilar metal strips using laser and pulsed current according to claim 1, characterized in that, The pulse current application mechanism (2) includes an outer frame (21), with two rollers (22) rotatably connected inside the outer frame (21). Inside the rollers (22) is a water channel for coolant circulation. On one side wall of the outer frame (21) are two coolant inlets (23) respectively connected to the water channels inside the two rollers (22). On the outer wall of the outer frame (21) opposite to the coolant inlets (23) are two coolant outlets (24) respectively connected to the water channels inside the two rollers (22). At the bottom of the outer frame (21) are two control terminals (25), which are respectively circuit control terminals and current input terminals. The control terminals (25) are connected to an external controller.

10. A method for synergistic preparation of dissimilar metal strips using laser and pulsed current, comprising using the apparatus for synergistic preparation of dissimilar metal strips using laser and pulsed current as described in claim 2 or 3, characterized in that, Includes the following steps: S1: Using a pre-processing device for metal coils, the metal coil material is unrolled, flattened, or cut for further processing or use; S2: The oxide layer and impurities on the surface of the metal sheet are removed by the metal sheet surface treatment device, and the roughness of the metal sheet is changed, thereby further improving the interfacial bonding strength. S3: The processed two dissimilar metal strips (3) are fed into the laser-pulse current composite rolling mechanism (6) through the mill feeding mechanism (1). The tensioning device (18) on the mill feeding mechanism (1) can move freely up, down, left, and right on the same vertical plane through the combination of vertical guide rail (12), vertical self-locking slider (14), horizontal guide rail (16) and horizontal self-locking slider (17). Thus, the conveying angle, sheet tension and misalignment of the two dissimilar metal strips (3) can be adjusted according to actual needs through the two tensioning devices (18). S4: When the two dissimilar metal strips (3) enter the laser-pulse current composite rolling mechanism (6), the protective gas nozzle (5) is connected to the external protective gas generator. The protective gas nozzle (5) is used to deliver protective gas to the junction of the two dissimilar metal strips (3) to provide the required atmosphere environment for the rolling environment. S5: A laser path (41) is emitted at the intersection of two dissimilar metal strips (3) by a laser (4). Under the action of the laser as a heat source to melt the surface of the metal strip, a pulse current is applied to the metal strip (3) by a pulse current application mechanism (2), and the two dissimilar metal strips (3) are pressed and composite by the first roller (621) and the second roller (622) in the laser-pulse current composite rolling mechanism (6).

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