A device and method for preparing a metal composite structure with a periodic heterogeneous interface by laser synergistic rolling

Abstract

The application discloses a device and method for preparing a metal composite structure with a periodic heterogeneous interface by laser and rolling, and belongs to the technical field of metal processing. The device mainly comprises an uncoiler, a laser, a rolling mill and a cross shear. The uncoiler flattens two metal strips and a metal net. The two metal strips are arranged in an upper-lower staggered mode and have a lap joint area. The metal net is arranged at the lap joint position of the interface between the upper and lower metal strips. The interface position of the metal lap joint area is tightly contacted by pre-pressing the rolling mill. Then, the upper surface of the metal strip is irradiated by laser, the interface of the lap joint area is slightly melted by heat conduction, and then a rolling pressure is applied. The rolling pressure promotes the metallurgical bonding of the interface and reduces the residual stress caused by laser. The application utilizes laser and rolling technology to form a periodic heterogeneous interface at the joint interface of the dissimilar metal lap joint, has the characteristics of metallurgical bonding and mechanical interlocking, and the rolling offsets the residual stress induced by laser.

Description

Technical Field

[0001] This invention relates to an apparatus and method for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling, belonging to the field of metal processing technology. Background Technology

[0002] Metal composite structures, such as copper-steel, aluminum-steel, and steel-titanium composites, are widely used in aerospace, new energy, petrochemical, and electronic instrumentation fields. Combining the performance advantages of different metals, metal composite structures possess excellent comprehensive performance and are a key metal material structure area for development in my country. However, due to the significant differences in thermophysical properties between different metals, the joints in composite structures are weak points, representing potential failure sites and limiting their further promotion and application. How to further improve the bonding performance of dissimilar metal composite structure joints is one of the current technical challenges facing the metal strip processing field.

[0003] For example, Chinese patent 2020116296133 discloses a method for preparing dissimilar metal composite structures by strong deformation and strong pressure assisted cold welding. It first generates a plastic deformation layer on the metal surface through friction stir welding, and then contacts the metal plastic deformation layers together and obtains a metal composite structure through vacuum diffusion welding. However, this method is limited to small-sized parts and has a long production cycle.

[0004] Chinese patent 2021109757619 discloses a method for preparing a copper-steel composite structure based on an electroplated nickel interlayer. The method first electroplats a nickel layer on the surface of a steel plate, and then deposits a copper alloy on the surface of the nickel layer by welding. After heat treatment and surface treatment, a copper-steel composite structure is obtained. However, this method involves electroplating and welding, which not only has high production costs, but also poses potential pollution during the electroplating process.

[0005] Chinese patent 2025107196730 discloses a laser composite-roll annealing method for high-strength steel-stainless steel composite plates. It utilizes a laser to directly act on the interface between high-strength steel and stainless steel, reduces the difference in strength and plasticity between carbon steel and high-strength steel through laser heating, and achieves the bonding of dissimilar metals through rolling composite. However, this method is for layered composite plates, which not only requires high-performance laser equipment, but also makes it impossible to form effective mechanical interlocking features at the interface.

[0006] In summary, to further promote the application of metal composite structures, it is necessary to improve the bonding performance of dissimilar metal composite structures. Metal composite structures can be obtained through methods such as rolling deformation, vacuum diffusion welding, and surfacing, but these methods have limitations in terms of production cycle, cost, and performance. Therefore, shortening the production cycle and reducing energy consumption and pollution are of great significance while ensuring good bonding performance. Summary of the Invention

[0007] To address the problems in related technologies, this invention provides a device for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling, thereby overcoming the problems existing in the prior art.

[0008] Meanwhile, this invention provides a method for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An apparatus for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling includes an upper uncoiler for unwinding an upper metal strip, an intermediate uncoiler for unwinding a metal mesh, and a lower uncoiler for unwinding a lower metal strip. The limiting and guiding device stacks the unfolded upper metal strip, lower metal strip and metal mesh, with an overlap area of ​​0.25-20mm between the upper and lower metal strips. The overlap area is equipped with metal mesh to obtain an overlap metal composite structure. The overlapping metal composite structure enters the pre-pressing rolling mill through guide rollers, and after pre-pressing, a metal composite structure with initial close contact is obtained; A metal composite structure that is initially in close contact is transformed into a metal composite structure with metallurgical bonding through a laser device; the laser head of the laser device is placed on the upper side of the overlapping area of ​​the initially in close contact metal composite structure. The metal composite structure with metallurgical bonding is conveyed to the rolling mill for rolling and pressing to obtain a metal composite structure with periodic heterogeneous interface.

[0010] Preferably, the periodic heterogeneous interface metal composite structure is cut by a cross-cutting device.

[0011] Preferably, the metal composite structure with metallurgical bonding is conveyed to the rolling mill by the first transmission roller; the metal composite structure with periodic heterogeneous interface is conveyed to the cross-cutting device by the second transmission roller, and the cut metal composite structure with periodic heterogeneous interface is conveyed by the third transmission roller.

[0012] Preferably, the limiting and guiding device includes two opposing vertical plates. The upper part of the vertical plates is provided with a first bearing seat for mounting the first roller and the second roller, and the lower part of the vertical plates is provided with a second bearing seat for mounting the third roller and the fourth roller. The sides of the two vertical plates are provided with a first stop bar for passing through the upper metal strip, a third stop bar for passing through the metal mesh, and a second stop bar for passing through the lower metal strip in sequence from top to bottom. Adjusting knobs are movably provided on the through holes of the first stop bar, the third stop bar, and the second stop bar. Adjusting rods for achieving lateral constraint of the upper metal strip, the metal mesh, or the lower metal strip are connected to the adjusting knobs. The hydraulic device is located on the lower side of the first bearing seat at both ends of the second roller and on the upper side of the second bearing seat at both ends of the third roller.

[0013] Preferably, the laser head of the laser device is mounted on a gantry that can move in three axes, with the laser head at an angle of 15-30° to the vertical direction, and the spot size generated by the laser head is 2~5 mm × 5~10 mm.

[0014] Preferably, the mill applies load hydraulically, and the upper and lower rolls are connected to the motor gearbox via a cross-shaft universal coupling. A copper cooling water tank to shield and reflect laser energy is installed on the upper roll support seat of the upper roll. The lower roll is installed on the lower roll support seat. The upper and lower rolls are arranged opposite each other and are used to roll a metal composite structure for metallurgical bonding. Hydraulic pressure is applied to the upper roll. Bearing seats are provided on both the upper and lower roll support seats. The bearings of the rolls pass through the bearing seats and are connected to the cross-shaft universal coupling.

[0015] Preferably, the thickness of the upper metal strip is 0.5~1.0 mm, the thickness of the lower metal strip is 0.5~1.0 mm, the width of the metal mesh and the overlapping area is 0.25-20 mm, the mesh spacing L is 0.2-0.6 mm, the wire diameter D is 0.05~0.25 mm, and the mesh size includes squares, rectangles, or hexagons; the L / D ratio of the metal mesh is 2.0-4.0, and D = (0.1-0.25) × the thickness of the lower metal strip; the upper metal strip includes 304 stainless steel strip, the lower metal strip includes T2 copper strip, the metal mesh is a woven stainless steel mesh, the metal wires in the metal mesh are in a cold-drawn state, and the mass percentage of each element in the metal mesh is C 0.04~0.06 wt%, Mn 1.0~2.0 wt%, Si 0.65~0.85 wt%, Cr 18.0~20.0 wt%, Ni 8.0~10.5 wt%. wt%, P≤0.04wt%, S≤0.03wt%, and the balance Fe.

[0016] A method for preparing a periodic heterogeneous interface metal composite structure using a laser-coordinated rolling process includes the following steps: S1. Select the upper metal strip, lower metal strip, and metal mesh; S2. The uncoiler unfolds the upper metal strip, the lower metal strip, and the metal mesh, and conveys them to the limiting guide device. After passing through the limiting guide device, the metal mesh is located in the overlapping area between the upper metal strip and the lower metal strip. S3. The upper metal strip, lower metal strip and metal mesh are conveyed to the pre-pressing rolling mill via guide rollers. The pre-pressing rolling mill subject the overlapping area to 0.1%-1.0% compressive strain, and the interface of the upper metal strip, lower metal strip and metal mesh achieves initial close contact, thus obtaining a metal composite structure with initial close contact. S4. The metal composite structure that has initially made close contact enters the laser action area. The rectangular spot generated by the laser head directly acts on the upper surface of the upper metal strip. The laser energy causes the interface where the metal mesh is located to melt slightly through heat conduction, forming a metallurgically bonded metal composite structure. The size of the rectangular laser spot is 2~5 mm × 5~10 mm, the distance between the laser spot and the mill roll gap is 20~50 mm, the width of the mill roll is 20~50 mm, and the laser power is 2000~2500 W. S5. After laser treatment, the metal composite structure with metallurgical bonding is transferred to the rolling mill for rolling and pressing. The compressive strain in the overlapping area is 0.05%~1.5%, thus obtaining a metal composite structure with a periodic heterogeneous interface. S6. A periodic heterogeneous interface metal composite structure is conveyed to the cross-cutting zone and cut according to the dimensions.

[0017] Preferably, the heterogeneous interface includes copper-steel, aluminum-steel, and steel-titanium heterogeneous interfaces, and the heterogeneous interface has a mechanical interlocking structure with a bonding strength of 220~225MPa.

[0018] The present invention relates to the application of the periodic heterogeneous interface metal composite structure in the fields of aerospace, new energy, petrochemicals, and electronic instruments.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. This invention addresses the technical challenge of weak joint performance in metal composite structures by proposing a method to obtain a copper-steel composite structure with a periodic heterogeneous interface through the addition of a specific mesh intermediate layer and laser-co-rolling. The interface exhibits both metallurgical bonding and mechanical interlocking characteristics, and the heterogeneous characteristics of the periodically distributed elements and microstructures at the interface contribute to the overall bonding performance.

[0020] 2. Laser-co-rolling technology makes full use of the high energy density and high heating efficiency of lasers, enabling the efficient preparation of metal composite structures and avoiding the problem of long production cycles. The rolling technology behind the laser helps to reduce the internal stress caused by the laser, and the surface of the composite structure is relatively flat and has better surface quality than the laser connection process alone.

[0021] 3. The periodic heterogeneous interface copper-steel composite structure obtained by laser-coordinated rolling technology can achieve customized preparation of periodic interfaces through specific metal meshes, making up for the shortcomings of weak bonding of traditional flat interfaces.

[0022] 4. Compared with conventional laser lap welding, this invention uses a rectangular spot + rolling technology to achieve the connection of dissimilar metal interfaces through heat conduction, resulting in a larger interface area.

[0023] This invention discloses an apparatus and method for preparing a periodic heterogeneous interface metal composite structure using laser-assisted rolling, belonging to the field of metal processing technology. It mainly includes: an uncoiler, a laser, a rolling mill, and a cross-cutting shear. The uncoiler flattens two metal strips and a metal mesh, with the two metal strips arranged in a staggered manner, creating an overlapping area. The metal mesh is located at the overlapping position between the upper and lower metal strips. Pre-pressing the rolling mill ensures tight contact at the interface of the overlapping area. Then, laser irradiation is applied to the upper surface of the metal strips, causing micro-melting of the interface through heat conduction. Rolling pressure is then applied. The rolling pressure promotes metallurgical bonding at the interface and reduces residual stress induced by the laser. This invention, by synergistically utilizing laser and rolling technologies, forms a periodic heterogeneous interface at the overlapping joint of dissimilar metals, possessing both metallurgical bonding and mechanical interlocking characteristics. Furthermore, rolling offsets the residual stress induced by the laser.

[0024] In this invention, the upper and lower metal strips have an overlap area of ​​0.25-20 mm, preferably 5-15 mm, with a metal mesh installed in the overlap area. Normal overlaps do not have the heterogeneous interface of this invention. This invention introduces a metal mesh during the overlap connection, creating a heterogeneous interface on the two-dimensional plane where the upper and lower metals meet. The invention also incorporates rolling processes simultaneously with the metal mesh, which helps to improve stress and deformation issues.

[0025] This invention essentially pertains to the welding of two metals. Lap welding, also known as overlapping welding, involves two metals overlapping and staggered, with the laser moving within the overlapping area. The difference between this invention and lap welding (overlap welding) is that the laser spot in this invention can move in three directions. The upper and lower metal strips move under the influence of the rollers, and a mesh-like intermediate layer fills the interface, ultimately forming a dissimilar metal composite structure.

[0026] The use of a metal mesh in this invention results in a stronger bond in the metal composite structure. In existing technologies, conventional lap joints using Gaussian lasers are a type of fusion welding, where the mesh melts away, making it impossible to form a heterogeneous interface. Even if the mesh doesn't melt, a heterogeneous interface with a mechanically interlocking structure cannot be achieved. This invention selects a specific rectangular laser spot and a specific metal mesh combined with a specific rolling process to obtain a heterogeneous interface with strong bond and a mechanically interlocking structure. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1This is an overall schematic diagram of an apparatus for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling according to an embodiment of the present invention. Figure 2 This is a schematic diagram of a limiting and guiding device in an apparatus for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the laser device and gantry in an apparatus for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the laser device and gantry in an apparatus for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a rolling mill and cooling water tank in an apparatus for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling according to an embodiment of the present invention. Figure 6 This is a schematic diagram of the rolling mill and cooling water tank from another angle in an apparatus for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling according to an embodiment of the present invention. Figure 7 This is a schematic cross-sectional view of a product with a periodic heterogeneous interface metal composite structure prepared by laser-coordinated rolling according to an embodiment of the present invention. Figure 8 This is a cross-sectional microstructure of a periodic heterogeneous interface metal composite structure prepared by laser-coordinated rolling according to an embodiment of the present invention; In the picture: 1. Upper uncoiler; 2. Middle uncoiler; 3. Lower uncoiler; 4. Upper metal strip; 5. Metal mesh; 6. Lower metal strip; 7. Limiting and guiding device; 701. First roller; 702. Second roller; 703. First bearing housing; 704. First stop bar; 705. Hydraulic device; 706. Third stop bar; 707. Third roller; 708. Second stop bar; 709. Fourth roller; 710. Second bearing housing; 8. Guide roller; 9. Pre-pressing lower mill; 10. Laser device; 1001. Laser head; 1002. First motor ; 1003, Second motor; 1004, Rack; 1005, Third motor; 1006, Slider; 1008, Fourth motor; 11, First transfer roll; 12, Rolling mill; 1201, Hydraulic system; 1202, Upper roll support; 1203, Upper roll; 1204, Copper cooling water tank; 1205, Lower roll; 1206, Lower roll support; 1207, Cross-shaft universal coupling; 1208, Motor gearbox; 1209, Bearing housing; 13, Second transfer roll; 14, Cross shearing device; 15, Third transfer roll. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The following embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0030] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0031] According to embodiments of the present invention, an apparatus and method for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling are provided.

[0032] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1 As shown. According to an embodiment of the present invention, an apparatus for preparing a periodic heterogeneous interface metal composite structure by laser-assisted rolling includes an upper uncoiler 1, a middle uncoiler 2, a lower uncoiler 3, a limiting and guiding device 7, a pre-pressing lower rolling mill 9, a laser device 10, a rolling mill 12, a cross-cutting device 14, and a plurality of transfer rollers 15.

[0033] Specifically, the upper uncoiler 1 unfolds the coiled metal into an upper metal strip 4, the lower uncoiler 3 unfolds the coiled metal into a lower metal strip 6, and the middle uncoiler 2 unfolds the metal mesh 5.

[0034] The limiting guide device 7 arranges the upper and lower metal strips and metal mesh in a specific position (i.e., the metal mesh 5 is located in the overlapping area between the upper metal strip 4 and the lower metal strip 6), and then enters the pre-pressing rolling mill 9 by the guide roller 8. The metal strip and metal mesh are brought into close contact through pre-pressing deformation.

[0035] The laser device 10 is fixed on the gantry frame. The laser spot directly irradiates the upper surface of the upper metal strip 4. The laser energy is transferred to the interface between the upper and lower metal strips through heat conduction, and micro-melting occurs at the interface to form a bond.

[0036] After laser treatment, the metal strip passes through the rolling mill 12, and the rolling mill 12 causes the lap area to bear a compressive strain of 0.05%~1.5%.

[0037] After the rolling mill 12 is deformed, the metal strip is cut to specific dimensions by a cross-cutting machine (i.e., cross-cutting device 14).

[0038] like Figure 2As shown, in one embodiment, the limiting guide device 7 includes four rollers. The upper metal strip 4 passes through the roll gap between the first roller 701 and the second roller 702, and is laterally constrained by the first stop bar 704. The lower metal strip 6 passes through the roll gap between the third roller 707 and the fourth roller 709, and is laterally constrained by the second stop bar 708. The metal mesh 5 is positionally constrained by the third stop bar 706.

[0039] Specifically, the limiting guide device 7 includes two opposing vertical plates. The upper part of the vertical plates is provided with a first bearing seat 703 for mounting the first roller 701 and the second roller 702, and the lower part of the vertical plates is provided with a second bearing seat 710 for mounting the third roller 707 and the fourth roller 709. From top to bottom, the sides of the two vertical plates are sequentially provided with a first stop bar 704 for passing through the upper metal strip 4, a third stop bar 706 for passing through the metal mesh 5, and a second stop bar 708 for passing through the lower metal strip 6. Adjustment knobs are movably mounted on the through holes of the first stop bar 704, the third stop bar 706, and the second stop bar 708. Adjustment knobs are connected to adjustment mechanisms for achieving lateral constraint of the upper metal strip 4, the metal mesh 5, or the lower metal strip 6. A hydraulic device 705 is used to transmit vertical loads to the first roller 701, the second roller 702, the third roller 707, and the fourth roller 709. By transmitting vertical loads, the first roller 701 and the second roller 702 clamp the upper metal strip 4, and the third roller 707 and the fourth roller 709 clamp the lower metal strip 6, thereby ensuring that the upper metal strip 4 and the lower metal strip 6 are taut and do not move laterally. The hydraulic device 705 is located on the lower side of the first bearing seat 703 at both ends of the second roller 702 and on the upper side of the second bearing seat 710 at both ends of the third roller 707. The two ends of the hydraulic device 705 are respectively bolted to the lower side of the first bearing seat 703 and the upper side of the second bearing seat 710.

[0040] like Figures 3~4 As shown, in one embodiment, for the laser device 10, the laser head 1001 is fixed on a gantry that can move in three axes. The gantry is equipped with a first motor 1002, a second motor 1003, a third motor 1005 and a fourth motor 1008. The motors drive the laser head to move in three axes, so that the light spot generated by the laser acts on the overlapping area of ​​the upper surface of the upper metal strip 4.

[0041] Specifically, the laser head 1001 is slidably connected to a vertical sliding column via a slider 1006. A first motor 1002 is mounted on the sliding column and electrically connected to the slider 1006 (to enable the laser head 1001 to move up and down). A toothed plate is also provided on the sliding column. The lower surface of the toothed plate meshes with a rack 1004. A second motor 1003 is mounted on the upper surface of the toothed plate, and the second motor 1003 drives the toothed plate to move back and forth on the rack 1004 (to enable the laser head 1001 to move back and forth). The rack 1004 is mounted on a horizontal plate. Two toothed plates are provided at both ends of the horizontal plate. The two toothed plates are movably connected to the two racks. A third motor 1005 and a fourth motor 1008 drive the toothed plates to move left and right on the racks (to enable the laser head 1001 to move left and right). The racks are mounted on the four bottom columns of the gantry frame.

[0042] like Figures 5~6 As shown, in one embodiment, for the rolling mill 12, the mill applies a load via hydraulic pressure 1201. The upper roll 1203 and the lower roll 1205 are connected to the motor gearbox 1208 via a universal joint 1207. A copper cooling water tank 1204 to shield and reflect laser energy is installed on the upper roll support 1202 of the upper roll 1203. The lower roll 1205 is mounted on the lower roll support 1206. The upper roll 1203 and the lower roll 1205 are arranged opposite each other and used for rolling. Hydraulic pressure 1201 applies pressure to the upper roll 1203, thereby realizing the rolling of the overlapping area of ​​the metal strip. Bearing seats 1209 are provided on both the upper roll support 1202 and the lower roll support 1206. The bearings of the rolls pass through the bearing seats 1209 and are connected to the universal joint 1207. The telescopic head of hydraulic 1201 is connected to the upper roll support seat 1202.

[0043] like Figure 1 As shown, according to another embodiment of the present invention, a method for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling is also provided, the method comprising the following steps: S1. Select copper or steel strips; S2. The uncoiler unfolds the metal strip and metal mesh 5 and conveys them to the limiting guide device 7. After passing through the limiting guide device 7, the metal mesh 5 is in the overlapping area between the upper metal strip 4 and the lower metal strip 6. S3, the metal strip and the metal mesh 5 are conveyed to the pre-pressing mill 9 via the guide roller 8. The pre-pressing mill 9 subjectes the overlapping area to 0.1%-1.0% compressive strain, and the interface of the metal strip and the metal mesh 5 achieves initial close contact. S4, the metal strip and metal mesh 5 enter the laser action area, and the light spot generated by the laser head 1001 directly acts on the upper surface of the upper metal strip 4. The laser energy causes the interface where the metal mesh 5 is located to melt slightly through heat conduction, forming a metallurgically bonded composite structure. S5. After laser treatment, the metal composite structure is conveyed to the rolling mill 12 for rolling and pressing, and the compressive strain in the overlapping area is 0.05%~1.5%; S6. The metal composite structure is conveyed to the shearing zone and cut to specific dimensions.

[0044] To facilitate understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in actual process will be described in detail below.

[0045] In practical applications, the metal strip and metal mesh 5 are first uncoiled using an uncoiler and overlapped using a limiting guide device 7. They are then transported to a pre-pressing mill 9 via guide rollers 8. The pre-pressing mill 9 enables the metal strip and metal mesh to achieve initial tight contact. Subsequently, they enter a laser device 10, where the laser beam directly acts on the upper surface of the upper metal strip 4. The laser energy is transmitted to the interface between the upper metal strip 4 and the lower metal strip 6, achieving initial interface bonding of the metal composite structure. The strip then enters a mill 12 to achieve slight deformation, further promoting interface bonding and offsetting the stress generated by the laser. Finally, the strip is cut using a cross shear 14. Example 1

[0046] A laser-coordinated rolling apparatus for preparing a periodic heterogeneous interface metal composite structure includes an upper uncoiler 1 for unwinding an upper metal strip 4, a middle uncoiler 2 for unwinding a metal mesh 5, and a lower uncoiler 3 for unwinding a lower metal strip 6. The limiting and guiding device 7 stacks the unfolded upper metal strip 4, lower metal strip 6 and metal mesh 5. There is a 5mm overlap area between the upper metal strip 4 and the lower metal strip 6. The overlap area is equipped with metal mesh to obtain an overlap metal composite structure. The overlapping metal composite structure enters the pre-pressing mill 9 through the guide roller 8, and after pre-pressing, a metal composite structure with initial close contact is obtained; The metal composite structure that is initially in close contact is transformed into a metal composite structure with metallurgical bonding by the laser device 10; the laser head 1001 of the laser device 10 is placed on the upper side of the overlapping area of ​​the metal composite structure that is initially in close contact. The metal composite structure with metallurgical bonding is conveyed to the rolling mill 12 for rolling and pressing to obtain a metal composite structure with periodic heterogeneous interface.

[0047] Preferably, the periodic heterogeneous interface metal composite structure is cut by the cross-cutting device 14.

[0048] Preferably, the metal composite structure with metallurgical bonding is conveyed to the rolling mill 12 by the first transmission roller 11; the metal composite structure with periodic heterogeneous interface is conveyed to the cross-cutting device 14 by the second transmission roller 13, and the cut metal composite structure with periodic heterogeneous interface is conveyed by the third transmission roller 15.

[0049] Preferably, the limiting guide device 7 includes two opposing vertical plates. The upper part of the vertical plates is provided with a first bearing seat 703 for mounting the first roller 701 and the second roller 702, and the lower part of the vertical plates is provided with a second bearing seat 710 for mounting the third roller 707 and the fourth roller 709. The sides of the two vertical plates are provided with a first stop bar 704 for passing through the upper metal strip 4, a third stop bar 706 for passing through the metal mesh 5, and a second stop bar 708 for passing through the lower metal strip 6, arranged sequentially from top to bottom. Adjusting knobs are movably provided on the through holes of the first stop bar 704, the third stop bar 706, and the second stop bar 708. Adjusting rods for achieving lateral constraint of the upper metal strip 4, the metal mesh 5, or the lower metal strip 6 are connected to the adjusting knobs.

[0050] Preferably, the laser head 1001 of the laser device 10 is mounted on a gantry that can move in three axes, the laser head 1001 has an angle of 15° with the vertical direction, and the spot size generated by the laser head 1001 is 2mm × 5mm.

[0051] Preferably, the mill 12 applies load via hydraulic pressure 1201. The upper roll 1203 and the lower roll 1205 are connected to the motor gearbox 1208 via a universal joint 1207. A copper cooling water tank 1204 to shield and reflect laser energy is installed on the upper roll support 1202 of the upper roll 1203. The lower roll 1205 is installed on the lower roll support 1206. The upper roll 1203 and the lower roll 1205 are arranged opposite each other and are used to roll a metal composite structure with metallurgical bonding. Hydraulic pressure 1201 applies pressure to the upper roll 1203. Bearing seats 1209 are provided on both the upper roll support 1202 and the lower roll support 1206. The bearings of the rolls pass through the bearing seats 1209 and are connected to the universal joint 1207.

[0052] Preferably, the upper metal strip 4 has a thickness of 1.0 mm, the lower metal strip 6 has a thickness of 1.0 mm, the width of the metal mesh 5 and the overlapping area is 5 mm, the hole spacing L of the metal mesh 5 is 0.5 mm, the wire diameter D of the metal mesh 5 is 0.25 mm, and the mesh of the metal mesh 5 is square; the L / D ratio of the metal mesh is 2.0, and D = 0.25 × the thickness of the lower metal strip 6 = 0.25 mm; the upper metal strip 4 is 304 stainless steel strip, the lower metal strip 6 is T2 copper strip, the metal mesh 5 is a stainless steel mesh prepared by weaving, the metal wires in the metal mesh 5 are in a cold-drawn state, and the mass percentage of each element in the metal mesh 5 is C 0.05wt%, Mn 1.5wt%, Si 0.75wt%, Cr 19.0wt%, Ni 9.5wt%, P 0.02wt%, S 0.01wt%, and the balance Fe.

[0053] A method for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling includes the following steps: unfolding a 1mm thick 304 stainless steel strip and a 1mm thick T2 copper strip, with an overlap area of ​​5mm between the 304 stainless steel and the T2 copper strip; using a steel mesh with a mesh spacing of 0.5mm, a wire diameter of 0.25mm, and a square mesh; placing the metal mesh in the overlap area between the 304 stainless steel and the T2 copper strip (e.g., ...). Figure 7 (As shown in the image). After a compressive strain of 1.0%, the energy generated by the laser spot directly acts on the upper surface of the 304 stainless steel. The laser spot size is 2 × 5 mm, the distance between the laser spot and the 12 roll gap of the rolling mill is 30 mm, the laser power is 2500 W, and the laser head 1001 has a 15° angle with the vertical direction. The strip after laser treatment is directly rolled with a compressive strain of 1.5% to obtain a copper-steel composite structure with a heterogeneous interface. The microstructure at the interface is shown in the image. Figure 8 As shown; the bonding performance was tested according to the tensile-shear test specimen in GB / T6396-2008 Test Method for Mechanical and Technological Properties of Composite Steel Plates, and the bonding strength was 225 MPa.

[0054] This embodiment describes the application of a periodic heterogeneous interface metal composite structure in the fields of aerospace, new energy, petrochemicals, and electronic instruments. Example 2

[0055] The difference between this embodiment and Embodiment 1 lies only in the following: A method for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling includes the following steps: unfolding a 1mm thick 304 stainless steel strip and a 1mm thick T2 copper strip, with an overlap area of ​​15mm between the 304 stainless steel and the T2 copper strip; and using a metal mesh (the mass percentages of each element in the metal mesh 5 are C 0.04wt%, Mn 1.0wt%, Si 0.65wt%, Cr 18.0wt%, Ni 8.0wt%, P 0.04wt%, S...). A steel mesh with a mesh spacing L of 0.6 mm, a wire diameter D of 0.2 mm, and a hexagonal mesh (L / D = 3.0) containing 0.03 wt% Fe and the balance of Fe was used. The mesh was placed in the overlapping area between 304 stainless steel and T2 copper. After a compressive strain of 0.5%, the energy generated by the laser spot was directly applied to the upper surface of the 304 stainless steel. The laser head 1001 was at a 30° angle to the vertical direction, the laser spot size was 5 × 10 mm, the distance between the laser spot and the 12 roll gap of the rolling mill was 20 mm, and the laser power was 2000 W. The strip after laser treatment was directly rolled with a compressive strain of 1.0% to obtain a copper-steel composite structure with a heterogeneous interface. The bonding performance was tested according to the tensile-shear test method in GB / T6396-2008 Test Method for Mechanical and Technological Properties of Composite Steel Plates, and the bonding strength was 220 MPa. Example 3

[0056] The only difference between this embodiment and Embodiment 1 is that: A method for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling includes the following steps: unfolding a 0.5mm thick 304 stainless steel strip and a 0.5mm thick T2 copper strip, with an overlap area of ​​0.25mm between the 304 stainless steel and the T2 copper strip; and preparing a metal mesh (metal mesh 5 with the following elemental mass percentages: C 0.06wt%, Mn 2.0wt%, Si 0.85wt%, Cr 20.0wt%, Ni 10.5wt%, P 0.01wt%, S...). A rectangular steel mesh with a mesh size L of 0.2 mm and a wire diameter D of 0.05 mm (D = 0.1 × 0.5 mm = 0.05 mm) and a balance Fe of 0.01 wt% was used. The mesh was placed in the overlapping area between 304 stainless steel and T2 copper. After 0.1% compressive strain, the energy generated by the laser spot was directly applied to the upper surface of 304 stainless steel. The laser head 1001 had a 20° angle with the vertical direction. The laser spot size was 3 × 5 mm. The distance between the laser spot and the 12 roll gap of the rolling mill was 50 mm. The laser power was 2000 W. The strip after laser treatment was directly rolled with a compressive strain of 0.05% to obtain a copper-steel composite structure with a heterogeneous interface. Example 4

[0057] The only difference between this embodiment and Embodiment 1 is that: A method for preparing a periodic heterogeneous interface metal composite structure by laser-assisted rolling includes the following steps: unfolding a 0.8mm thick 304 stainless steel strip and a 1.0mm thick T2 copper strip, with an overlap area of ​​20mm between the 304 stainless steel and the T2 copper, a metal mesh with a mesh spacing L of 0.45mm, a wire diameter D of 0.15mm (D=0.15×1.0mm=0.15mm), and a rectangular steel mesh with L / D=3.0, and placing the metal mesh in the overlap area between the 304 stainless steel and the T2 copper; after applying a 0.5% compressive strain, the energy generated by the laser spot is directly applied to the upper surface of the 304 stainless steel, with the laser head 1001 at a 30° angle to the vertical direction, a laser spot size of 5×10mm, and a laser power of 2500W; the strip after laser application is directly rolled with a compressive strain of 0.8% to obtain a copper-steel composite structure with a heterogeneous interface. Example 5

[0058] The only difference between this embodiment and Embodiment 1 is that: The upper metal strip 4 is aluminum strip, and the lower metal strip 6 is T2 copper strip. Example 6

[0059] The only difference between this embodiment and Embodiment 1 is that: The upper metal strip 4 is made of 304 stainless steel, and the lower metal strip 6 is made of titanium.

[0060] Comparative Example 1: (The only difference between this comparative example and Example 1 is that the metal mesh is omitted in this comparative example.) A method for preparing a copper-steel composite structure with a periodic heterogeneous interface by laser-assisted rolling includes the following steps: unfolding a 1mm thick 304 stainless steel strip and a 1mm thick T2 copper strip, with an overlap area of ​​5mm between the 304 stainless steel and the T2 copper; after a compressive strain of 1.0%, the energy generated by the laser spot is directly applied to the upper surface of the 304 stainless steel, the laser spot size is 2×5 mm, and the laser power is 2000 W; the strip after laser treatment is directly rolled with a compressive strain of 1.5%; the bonding performance is tested according to the tensile-shear test method in GB / T6396-2008 Test Method for Mechanical and Technological Properties of Composite Steel Plates, and the bonding strength is 178 MPa.

[0061] Comparative Example 2: (The only difference between this comparative example and Example 1 is that the rolling process is omitted in this comparative example.) A method for preparing a copper-steel composite structure with a periodic heterogeneous interface using laser-assisted rolling includes the following steps: unfolding a 1mm thick 304 stainless steel strip and a 1mm thick T2 copper strip, with a 5mm overlap between the 304 stainless steel and the T2 copper; placing a steel mesh with a hole spacing of 0.5mm, a wire diameter of 0.25mm, and a square grid in the overlap area between the 304 stainless steel and the T2 copper; the energy generated by the laser spot directly acts on the upper surface of the 304 stainless steel, the laser spot size is 2 × 5mm, and the laser power is 2000 W; testing the bonding performance using tensile-shear specimens according to the test methods for mechanical and technological properties of composite steel plates in GB / T6396-2008, the bonding strength is 197 MPa.

[0062] Comparative Example 3: (The only difference between this comparative example and Example 1 is that the metal mesh in this comparative example is different.) A method for preparing a copper-steel composite structure with a periodic heterogeneous interface using laser-assisted rolling includes the following steps: 1mm thick 304 stainless steel and 1mm thick T2 copper strip are unrolled, with a 5mm overlap between the 304 stainless steel and T2 copper. An unoptimized steel mesh with a mesh spacing of 1.4mm, a wire diameter of 0.1mm, and a square grid is placed in the overlap area between the 304 stainless steel and T2 copper, with an L / D ratio of 14. After a 0.5% compressive strain, the energy generated by the laser spot is directly applied to the upper surface of the 304 stainless steel. The laser spot size is 2 × 5 mm, and the laser power is 2000 W. The laser-treated strip is then directly rolled with a compressive strain of 1.0% to obtain the copper-steel composite structure with a heterogeneous interface. The bonding performance is tested according to the tensile-shear test method in GB / T6396-2008, "Test Methods for Mechanical and Technological Properties of Composite Steel Plates," and the bonding strength is 190 MPa.

[0063] Comparative Example 4: (The only difference between this comparative example and Example 1 is that the metal mesh in this comparative example is different.) A method for preparing a copper-steel composite structure with a periodic heterogeneous interface using laser-assisted rolling includes the following steps: 1mm thick 304 stainless steel and 1mm thick T2 copper strip are unrolled, with a 5mm overlap between the 304 stainless steel and T2 copper. An unoptimized steel mesh with a mesh spacing of 0.09mm, a wire diameter of 0.05mm, and a square grid is placed in the overlap area between the 304 stainless steel and T2 copper, with an L / D ratio of 1.8. After a 0.5% compressive strain, the energy generated by the laser spot is directly applied to the upper surface of the 304 stainless steel. The laser spot size is 2 × 5mm, and the laser power is 2000 W. The laser-treated strip is then directly rolled with a compressive strain of 1.0% to obtain the copper-steel composite structure with a heterogeneous interface. The bonding performance is tested according to the tensile-shear test method in GB / T6396-2008, "Test Methods for Mechanical and Technological Properties of Composite Steel Plates," and the bonding strength is 180 MPa.

[0064] Comparative Example 5: (The only difference between this comparative example and Example 1 is that the metal mesh in this comparative example is different.) A method for preparing a copper-steel composite structure with a periodic heterogeneous interface using laser-assisted rolling includes the following steps: 1mm thick 304 stainless steel and 1mm thick T2 copper strip are unrolled, with a 5mm overlap between the 304 stainless steel and T2 copper. An unoptimized steel mesh with a mesh spacing of 0.25mm, a wire diameter of 0.05mm, and a square grid is placed in the overlap area between the 304 stainless steel and T2 copper, with an L / D ratio of 5.0. After a 0.5% compressive strain, the energy generated by the laser spot is directly applied to the upper surface of the 304 stainless steel. The laser spot size is 2 × 5 mm, and the laser power is 2000 W. The laser-treated strip is then directly rolled with a compressive strain of 1.0% to obtain the copper-steel composite structure with a heterogeneous interface. The bonding performance is tested according to the tensile-shear test method in GB / T6396-2008, "Test Methods for Mechanical and Technological Properties of Composite Steel Plates," and the bonding strength is 185 MPa.

[0065] In summary, by utilizing the above-described technical solution of this invention, a copper-steel composite structure with a periodic heterogeneous interface is obtained by combining laser processing with rolling and adding an auxiliary metal mesh. This fully realizes the metallurgical bonding and mechanical interlocking of the interface, and is superior to conventional diffusion welding and surfacing welding in terms of size and production efficiency. Furthermore, the laser processing of this invention facilitates automatic control, and the high laser energy density allows for rapid micro-melting of the interface, thus aiding in continuous production.

[0066] It should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof in the above description of exemplary embodiments of the invention. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed invention requires more features than expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in fewer than all the features of the foregoingly disclosed embodiments. Therefore, the claims, following the detailed description, are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0067] Although the invention has been described with reference to a limited number of embodiments, those skilled in the art will understand from the foregoing description that other embodiments are conceivable within the scope of the invention described herein. Furthermore, it should be noted that the language used in this specification has been chosen primarily for readability and instructional purposes, and not for the purpose of interpreting or limiting the subject matter of the invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the invention is illustrative and not restrictive, and the scope of the invention is defined by the appended claims.

[0068] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a periodic heterogeneous interface metal composite structure by laser-coordinated rolling, characterized in that, The apparatus includes an upper uncoiler (1) for unwinding the upper metal strip (4), an intermediate uncoiler (2) for unwinding the metal mesh (5), and a lower uncoiler (3) for unwinding the lower metal strip (6). The limiting guide device (7) stacks the unfolded upper metal strip (4), lower metal strip (6) and metal mesh (5). There is an overlap area of ​​0.25-20mm between the upper metal strip (4) and the lower metal strip (6). The overlap area is equipped with metal mesh to obtain an overlap metal composite structure. The overlapping metal composite structure enters the pre-pressing mill (9) through the guide roller (8), and after pre-pressing, a metal composite structure with initial close contact is obtained; The metal composite structure that is initially in close contact is used to obtain a metal composite structure with metallurgical bonding through the laser device (10); the laser head (1001) of the laser device (10) is placed on the upper side of the overlapping area of ​​the metal composite structure that is initially in close contact. The metal composite structure with metallurgical bonding is conveyed to the rolling mill (12) for rolling and pressing to obtain a metal composite structure with periodic heterogeneous interface; The upper metal strip (4) has a thickness of 0.5~1.0 mm, the lower metal strip (6) has a thickness of 0.5~1.0 mm, the width of the metal mesh (5) and the overlapping area is 0.25-20 mm, and the hole spacing L of the metal mesh (5) is 0.2-0.6 mm. mm, the wire diameter D of the metal mesh (5) is 0.05~0.25mm, the mesh of the metal mesh (5) includes square, rectangle or hexagon; the L / D of the metal mesh is 2.0-4.0, D = (0.1-0.25) × the thickness of the lower metal strip (6); the upper metal strip (4) includes 304 stainless steel strip, the lower metal strip (6) includes T2 copper strip, the metal mesh (5) is a stainless steel mesh prepared by weaving, the metal wire in the metal mesh (5) is in a cold drawn state, the mass percentage of each element in the metal mesh (5) is C 0.04~0.06wt%, Mn 1.0~2.0wt%, Si 0.65~0.85 wt%, Cr 18.0~20.0wt%, Ni 8.0~10.5 wt%, P≤0.04 wt%, S≤0.03 wt% and the balance Fe; The method includes the following steps: S1. Select the upper metal strip (4), the lower metal strip (6), and the metal mesh (5). S2. The uncoiling machine unfolds the upper metal strip (4), the lower metal strip (6) and the metal mesh (5) and conveys them to the limiting guide device (7). After passing through the limiting guide device (7), the metal mesh (5) is in the overlapping area between the upper metal strip (4) and the lower metal strip (6). S3. The upper metal strip (4), the lower metal strip (6) and the metal mesh (5) are transported to the pre-pressing rolling mill (9) via the guide roller (8). The pre-pressing rolling mill (9) causes the overlapping area to bear 0.1%-1.0% compressive strain, and the interface of the upper metal strip (4), the lower metal strip (6) and the metal mesh (5) achieves initial close contact, thus obtaining a metal composite structure with initial close contact. S4. The metal composite structure that has initially made close contact enters the laser action area. The rectangular spot generated by the laser head (1001) directly acts on the upper surface of the upper metal strip (4). The laser energy causes the interface where the metal mesh (5) is located to melt slightly through heat conduction, forming a metal composite structure with metallurgical bonding. The size of the rectangular laser spot is 2~5 mm × 5~10 mm, the distance between the laser spot and the roll gap of the rolling mill (12) is 20~50 mm, and the laser power is 2000~2500 W; S5. After laser treatment, the metal composite structure with metallurgical bonding is transferred to the rolling mill (12) for rolling and pressing. The compressive strain of the overlapping area is 0.05%~1.5%, and a metal composite structure with periodic heterogeneous interface is obtained. S6. A periodic heterogeneous interface metal composite structure is conveyed to the cross-cutting zone and cut according to the dimensions.

2. The method according to claim 1, characterized in that, The periodic heterogeneous interface metal composite structure is cut by a cross-cutting device (14).

3. The method according to claim 1, characterized in that, The metal composite structure with metallurgical bonding is conveyed to the rolling mill (12) by the first transmission roller (11); the metal composite structure with periodic heterogeneous interface is conveyed to the cross-cutting device (14) by the second transmission roller (13); and the cut metal composite structure with periodic heterogeneous interface is conveyed by the third transmission roller (15).

4. The method according to claim 1, characterized in that, The limiting guide device (7) includes two opposing vertical plates. The upper part of the vertical plates is provided with a first bearing seat (703) for mounting the first roller (701) and the second roller (702), and the lower part of the vertical plates is provided with a second bearing seat (710) for mounting the third roller (707) and the fourth roller (709). The sides of the two vertical plates are provided with a first stop bar (704) for passing through the upper metal strip (4), a third stop bar (706) for passing through the metal mesh (5), and a third stop bar (706) for passing through the upper metal strip (4). Adjustment knobs are movably provided on the through holes of the second stop bar (708), the first stop bar (704), the third stop bar (706), and the second stop bar (708) of the lower metal strip (6). Adjustment rods for achieving lateral constraint of the upper metal strip (4), the metal mesh (5), or the lower metal strip (6) are connected to the adjustment knobs. The hydraulic device (705) is located on the lower side of the first bearing seat (703) at both ends of the second roller (702) and on the upper side of the second bearing seat (710) at both ends of the third roller (707).

5. The method according to claim 1, characterized in that, The laser head (1001) of the laser device (10) is mounted on a gantry that can move in three axes. The laser head (1001) has an angle of 15-30° with the vertical direction. The spot size generated by the laser head (1001) is 2~5 mm × 5~10 mm.

6. The method according to claim 1, characterized in that, The rolling mill (12) applies load via hydraulic pressure (1201). The upper roll (1203) and lower roll (1205) are connected to the motor gearbox (1208) via a cross-type universal coupling (1207). A copper cooling water tank (1204) to shield and reflect laser energy is installed on the upper roll support (1202) of the upper roll (1203). The lower roll (1205) is mounted on the lower roll support (1206). The upper roll (1203) and the lower roll (1205) are arranged opposite each other and are used to roll a metal composite structure for metallurgical bonding. Hydraulic pressure (1201) applies pressure to the upper roll (1203). Bearing seats (1209) are provided on both the upper roll support seat (1202) and the lower roll support seat (1206). The bearing of the roll passes through the bearing seat (1209) and is connected to the cross shaft universal coupling (1207).

7. The periodic heterogeneous interface metal composite structure prepared by the method according to any one of claims 1-6, characterized in that, The heterogeneous interface is a copper-steel heterogeneous interface with a mechanical interlocking structure and a bonding strength of 220~225MPa.

8. The application of the periodic heterogeneous interface metal composite structure according to claim 7 in the fields of aerospace, new energy, petrochemicals, and electronic instruments.

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