Method for producing a metal composite plate

Abstract

The application relates to the technical field of metal composite plate preparation, and provides a preparation method of a metal composite plate, which comprises the following steps: stacking a first metal plate and a second metal plate to form a first to-be-welded interface between the first metal plate and the second metal plate; performing high-frequency laser line scanning on the first to-be-welded interface along the width direction of the first metal plate to form a line molten pool, and pressing the line molten pool; performing high-frequency laser line scanning multiple times along the length direction of the first to-be-welded interface to form multiple line molten pools and pressing, so that the first metal plate and the second metal plate at the first to-be-welded interface are combined. The preparation method of the metal composite plate can continuously weld the metal plates by performing high-frequency laser line scanning on the first to-be-welded interface and pressing the line molten pool, the metal composite plate is formed, the interface of the metal composite plate is not prone to cracking, warping and other problems, the preparation efficiency of the metal composite plate is improved, and the preparation quality of the metal composite plate is improved.

Description

Technical Field

[0001] This invention relates to the field of metal composite plate preparation technology, and in particular to a method for preparing a metal composite plate. Background Technology

[0002] Metal composite plates are materials made by laminating two layers of dissimilar metals together using a special process to achieve interfacial metallurgical bonding. Some metal resources, such as Ti, Cr, and Ni, possess excellent advantages such as corrosion resistance, oxidation resistance, high strength, wear resistance, and good biocompatibility; however, their high price and limited resources restrict their widespread application. Therefore, the preparation of dissimilar metal composite plates has gradually become a hot topic. Currently, the most widely used methods for preparing metal composite plates are explosive welding, rolling, and explosive-rolling composite methods.

[0003] (1) Explosive welding method: This method involves cleaning and stacking the metal layers to be laminated, placing explosives on the top layer of the metal plates, and using the high temperature and shock wave generated by the explosion to cause the metal plates to be squeezed, deformed, bonded and diffused, thus achieving interface bonding. The advantages of explosive welding are: low cost, relatively simple process, and no need for complex equipment. However, the disadvantages of explosive welding are also quite prominent: the noise and smoke generated by the explosion pollute the environment; the interface of the composite plate is generally wavy, and the interface bonding is uneven; the size is limited, suitable for small-sized thick composite plates, and cannot produce large-sized thin plates; single-piece production, unable to achieve continuous production, and low production efficiency.

[0004] (2) Rolling method: This method uses the pressure of rolls to cause the metal to deform violently. It usually requires preheating of the material. Under the dual action of temperature and pressure, the mutual diffusion between metal atoms is promoted, and the interfacial metallurgical bonding is achieved. Advantages of rolling method: continuous production, high efficiency; wide production range, can process large-size plates; uniform interface, high surface quality. However, it also has unavoidable disadvantages: interface anti-oxidation treatment is required before hot rolling. For active metals such as Ti and Al, sealing welding is required in a vacuum environment, which increases the processing cycle and cost. At the same time, preheating treatment increases energy consumption; cold rolling requires high-power rolling equipment to achieve large deformation rolling, and the workpiece is prone to interface cracking or edge cracking and warping.

[0005] (3) Explosive-Rolling Composite Method: This method involves first preparing metal composite plate blanks using explosive welding, and then hot-rolling or cold-rolling them to produce composite plates of the required thickness. Although this method does not require pretreatment before rolling, it still suffers from the defects of explosive welding, resulting in continuous production, low efficiency, and high equipment costs. Therefore, providing a new method for preparing metal composite plates has become an urgent problem to be solved in the industry. Summary of the Invention

[0006] This invention provides a method for preparing a metal composite plate, which solves the defects of existing technologies such as explosive welding and explosive-rolling composite methods, which cannot produce continuously, and the easy occurrence of interface cracking, edge cracking, and warping of rolled workpieces.

[0007] This invention provides a method for preparing a metal composite plate, comprising: stacking a first metal plate and a second metal plate to form a first V-shaped structure, wherein the first V-shaped structure is a first weld interface; performing high-frequency laser line scanning along the width direction of the first metal plate to form a molten pool, and pressing the molten pool; performing multiple high-frequency laser line scannings along the length direction of the first weld interface to form multiple molten pools and pressing them together, so that the first metal plate and the second metal plate at the first weld interface achieve inter-plate bonding.

[0008] According to a method for preparing a metal composite plate provided by the present invention, the step of performing multiple high-frequency laser line scans along the length direction of the first interface to be welded to form multiple molten pools and pressing them together to achieve inter-plate bonding between the first metal plate and the second metal plate at the first interface to be welded includes: performing high-frequency laser line scans along a first bonding line between the first metal plate and the second metal plate at the first interface to be welded to form a first molten pool; pressing the first molten pool together to bond the first metal plate and the second metal plate at the first bonding line; performing high-frequency laser line scans along a second bonding line between the first metal plate and the second metal plate at the first interface to be welded to form a second molten pool; pressing the second molten pool together to bond the first metal plate and the second metal plate at the second bonding line; repeating the above steps until the first metal plate and the second metal plate at the first interface to be welded are completely welded together.

[0009] According to a method for preparing a metal composite plate provided by the present invention, the step of performing high-frequency laser line scanning on the first interface to be welded along the width direction of the first metal plate to form a line molten pool, and pressing the line molten pool includes: setting a pressure device on one side of the first metal plate, or on both sides of the first metal plate and the second metal plate; and controlling the movement of the pressure device or the first metal plate and the second metal plate when welding the first interface to be welded.

[0010] According to a method for preparing a metal composite plate provided by the present invention, the method includes: setting the pressure device on one side of the first metal plate; when welding the first interface to be welded, controlling the pressure device to roll along the first metal plate, and simultaneously controlling the laser source to move synchronously with the pressure device.

[0011] According to a method for preparing a metal composite plate provided by the present invention, the method includes: arranging a pair of pressure devices opposite to each other on both sides of a first metal plate and a second metal plate; and controlling the pair of pressure devices to rotate simultaneously during welding of the first interface to be welded, so as to drive the first metal plate and the second metal plate to move.

[0012] According to a method for preparing a metal composite plate provided by the present invention, the step of stacking a first metal plate and a second metal plate to form a first V-shaped structure, wherein the first V-shaped structure is a first interface to be welded, includes: stacking a first end of the first metal plate and a first end of the second metal plate; bending at least one of the second end of the first metal plate and the second end of the second metal plate to form the first V-shaped structure.

[0013] According to a method for preparing a metal composite plate provided by the present invention, the method further includes: after welding the second end of the first metal plate to the second end of the second metal plate, bending at least one of the first end of the first metal plate and the first end of the second metal plate to form a second V-shaped structure, wherein the second V-shaped structure is a second interface to be welded; performing high-frequency laser scanning on the edge of the second interface to be welded while pressing, so that the first metal plate and the second metal plate at the second interface to be welded achieve inter-plate bonding.

[0014] According to a method for preparing a metal composite plate provided by the present invention, the opening angle of the first V-shaped structure is 45°-120°.

[0015] According to a method for preparing a metal composite plate provided by the present invention, before the step of stacking a first metal plate and a second metal plate to form a first V-shaped structure, wherein the first V-shaped structure is a first interface to be welded, the preparation method further includes: setting the laser beam spot size to 50 μm~200 μm and the power density to 5.0×10⁻⁶. 6 W / cm 2 ~5.0×10 8 W / cm 2 Scanning frequency ≥ 50 Hz.

[0016] According to a method for preparing a metal composite plate provided by the present invention, before the step of stacking a first metal plate and a second metal plate to form a first V-shaped structure, wherein the first V-shaped structure is a first interface to be welded, the preparation method further includes: setting the unit length pressure of the first interface to be welded to be 2 N / mm to 100 N / mm.

[0017] The method for preparing a metal composite plate provided by the present invention enables continuous welding of metal plates by performing high-frequency laser line scanning on the edge of the first interface to be welded and pressing the line molten pool, thereby improving the preparation efficiency of the metal composite plate; the interface of the composite plate will not form a wavy shape, and the interface of the metal composite plate is not prone to cracking, warping and other problems, thereby improving the preparation quality of the metal composite plate. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the preparation method of the metal composite plate provided by the present invention.

[0020] Figure label:

[0021] 1. First metal plate; 2. Second metal plate; 3. Laser source; 4. Pressure device. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] The following is combined Figure 1 The method for preparing the metal composite plate of the present invention is described.

[0024] like Figure 1 As shown, in an embodiment of the present invention, the method for preparing a metal composite plate includes the following steps: Step 100, stacking a first metal plate 1 and a second metal plate 2 to form a first V-shaped structure, wherein the first V-shaped structure is a first interface to be welded; Step 200, performing high-frequency laser line scanning on the edge of the first interface to be welded while pressing the line molten pool, repeating this process to achieve inter-plate bonding between the first metal plate 1 and the second metal plate 2 at the first interface to be welded.

[0025] Specifically, when welding two metal plates of different materials into a composite metal plate, the first metal plate 1 and the second metal plate 2 are first stacked. One end of the first metal plate 1 and / or one end of the second metal plate 2 is bent to form a first V-shaped structure between the first metal plate 1 and the second metal plate 2. This first V-shaped structure is the first interface to be welded. A laser source 3 is positioned opposite to the first interface to be welded. The focused spot emitted by the laser source 3 performs a high-frequency laser line scan along the bonding line of the first metal plate 1 and the second metal plate 2. The high-energy-density laser scans along the bonding line, which can quickly melt the surface materials of the first metal plate 1 and the second metal plate 2 to form a molten pool. Then, the molten pool is pressed together to weld the first metal plate 1 and the second metal plate 2 at the bonding line using pressure. Subsequently, laser source 3 continues to perform high-frequency laser line scanning on the new bonding line between the first metal plate 1 and the second metal plate 2. The high-energy-density laser forms a molten pool along the bonding line, and then the molten pool is pressed again to weld the first metal plate 1 and the second metal plate 2 together at the new bonding line using pressure. The above method is repeated until the first metal plate 1 and the second metal plate 2 at the first interface to be welded are completely welded, achieving inter-plate bonding between the first metal plate 1 and the second metal plate 2.

[0026] It should be noted that, in the embodiments of the present invention, the laser beam emitted by the laser source 3 is processed by a focusing lens and a scanning device to obtain a finely focused high-frequency scanning beam. The focused spot diameter of this finely focused high-frequency scanning beam is 50 μm to 200 μm, and the power density is 5.0 × 10⁻⁶. 6 W / cm 2 ~5.0×10 8 W / cm 2 The scanning frequency is ≥50 Hz. When this finely focused high-frequency scanning beam performs a high-frequency scan on the bonding line, it can rapidly heat and melt the surface materials of the first metal plate 1 and the second metal plate 2, and then use pressure to weld the first metal plate 1 and the second metal plate 2 together. In this embodiment, the first metal plate 1 and the second metal plate 2 can be the same type of dissimilar material, such as the first metal plate 1 being a pure aluminum plate and the second metal plate 2 being an aluminum alloy plate; or they can be metal plates of different materials, such as the first metal plate 1 being an aluminum plate and the second metal plate 2 being a copper plate.

[0027] In this embodiment, the opening angle of the first V-shaped structure is 45°-120°.

[0028] The method for preparing a metal composite plate provided in this invention involves performing high-frequency laser line scanning on the edge of the first interface to be welded while simultaneously pressing the molten pool, enabling continuous welding of the metal plate and improving the preparation efficiency of the metal composite plate. Furthermore, the interface of the composite plate does not form a wavy shape, and the interface of the metal composite plate is less prone to cracking, warping, or other problems, thus improving the preparation quality of the metal composite plate.

[0029] Furthermore, in an embodiment of the present invention, the steps of performing high-frequency laser line scanning on the first interface to be welded to form a molten pool, pressing the molten pool together, and repeating this process to achieve inter-plate bonding between the first metal plate 1 and the second metal plate 2 at the first interface to be welded include:

[0030] At the first interface to be welded, a high-frequency laser line scan is performed along the first bonding line between the first metal plate 1 and the second metal plate 2 to form a first molten pool at the first bonding line. After the high-frequency laser line scan, the first molten pool is pressed together to bond the first metal plate 1 and the second metal plate 2 at the first bonding line. At this time, the new bonding area between the first metal plate 1 and the second metal plate 2 is the second bonding line. A high-frequency laser line scan is performed along the second bonding line to form a second molten pool, and the second molten pool is pressed together to bond the first metal plate 1 and the second metal plate 2 at the second bonding line. By repeating the above steps, N molten pools can be pressed together along the length of the first interface to be welded, thereby bonding the first interface to be welded of the first metal plate 1 and the second metal plate 2 into a metal composite plate.

[0031] The method for preparing a metal composite plate provided in this invention forms N molten pools along the length of the first interface to be welded, and presses the molten pools together when each molten pool is formed, so that the surface of the formed metal composite plate is flat and the welding is uniform, thereby improving the preparation quality of the metal composite plate.

[0032] In one embodiment of the present invention, for thinner sheet metal, the raw materials of the thinner metal sheet are usually arranged in rolls. The rolls of the first metal sheet 1 and the second metal sheet 2 are respectively mounted on a rotating shaft, so that the rolls of the first metal sheet 1 and the second metal sheet 2 can rotate when one end of the first metal sheet 1 and the second metal sheet 2 is pulled. The first ends of the first metal sheet 1 and the first ends of the second metal sheet 2 are overlapped to form a bonding line. There is a certain distance between the rolls of the first metal sheet 1 and the rolls of the second metal sheet 2, thus forming a V-shaped structure. High-frequency laser scanning and pressing are performed along the edge of the first V-shaped structure to prepare a metal composite plate of the required length.

[0033] In another embodiment of the present invention, for thicker plates, the thicker plates are usually sheet-like. First, a first metal plate 1 and a second metal plate 2 can be cut to the length of the metal composite plate to be prepared. Taking the center line of the first metal plate 1 and the second metal plate 2 as the starting line, the first ends of the first metal plate 1 and the first ends of the second metal plate 2 are overlapped, and at least one of the second ends of the first metal plate 1 and the second metal plate 2 is bent to form a first V-shaped structure. After welding the first V-shaped structure, at least one of the first ends of the first metal plate 1 and the first ends of the second metal plate 2 is bent to form a second V-shaped structure. High-frequency laser line scanning is performed on the edges of the second V-shaped structure while pressing the molten pool, so that the first ends of the first metal plate 1 and the first ends of the second metal plate 2 are welded together.

[0034] In an embodiment of the present invention, the step of performing high-frequency laser line scanning on the first interface to be welded to form a molten pool, pressing the molten pool, and repeating this process to achieve inter-plate bonding between the first metal plate 1 and the second metal plate 2 at the first interface to be welded further includes: setting a pressure device 4 on one side of the first metal plate 1 or on both sides of the first metal plate 1 and the second metal plate 2; and controlling the movement of the pressure device 4 or the first metal plate 1 and the second metal plate 2 when welding the first interface to be welded.

[0035] Specifically, in the embodiments of the present invention, when welding the first interface to be welded, the pressure device 4 can be controlled to move to press the first metal plate 1 and the second metal plate 2 together; or the first metal plate 1 and the second metal plate 2 can be controlled to move to press the first metal plate 1 and the second metal plate 2 together.

[0036] Optionally, in one embodiment of the present invention, a pressure device 4 may be provided on one side of the first metal plate 1, and the second metal plate 2 may be provided on the platform. In this case, the first metal plate 1 can be bent to form a V-shaped structure with the second metal plate 2. When welding the V-shaped structure, the laser source 3 performs high-frequency laser line scanning on the bonding line. Each time a molten pool is formed, the pressure device 4 rolls forward once to press the molten pool, thus welding the first metal plate 1 and the second metal plate 2 together at the bonding line. Correspondingly, as the pressure device 4 moves forward, the laser source 3 moves forward synchronously with the pressure device 4 to ensure that the distance between the laser source 3 and the bonding line remains equal, thereby guaranteeing the consistency and uniformity of the weld.

[0037] Optionally, in another embodiment of the present invention, a pair of pressure devices 4 can be arranged opposite each other on both sides of the first metal plate 1 and the second metal plate 2. In this case, both the first metal plate 1 and the second metal plate 2 can be bent to form a V-shaped structure. When welding the V-shaped structure, the laser performs high-frequency laser line scanning on the bonding line. Each time a line molten pool is formed, the pressure device 4 rotates, driving the first metal plate 1 and the second metal plate 2 to move backward. The pressure device 4 presses the line molten pool, so that the first metal plate 1 and the second metal plate 2 are welded at the bonding line. In this embodiment, the pressure device 4 can rotate in place to drive the first metal plate 1 and the second metal plate 2 to press the line molten pool. The laser source 3 does not need to move, making the operation more convenient.

[0038] Optionally, in an embodiment of the present invention, the pressure device 4 applies a pressure of 2 N / mm to 100 N / mm per unit length to the first metal plate 1 and the second metal plate 2, and the pressure device 4 may be a pressure roller or the like.

[0039] The following detailed description of the specific steps in the preparation method of the metal composite plate provided by the present invention is based on a specific embodiment:

[0040] Taking the first metal plate 1 as an example, which is made of T2 copper and the second metal plate 2 as made of 1060 aluminum alloy, with both the first metal plate 1 and the second metal plate 2 having a thickness of 1.5mm and a width of 200mm:

[0041] Since the first metal plate 1 and the second metal plate 2 are relatively thin, the raw materials of the first metal plate 1 and the second metal plate 2 are usually rolled up. The rolls of the first metal plate 1 and the second metal plate 2 are respectively mounted on a rotating shaft so that the rolls of the first metal plate 1 and the second metal plate 2 can rotate when one end of the first metal plate 1 and the second metal plate 2 is pulled.

[0042] The first end of the first metal plate 1 and the first end of the second metal plate 2 are stacked together. A pair of pressure devices 4 are respectively set on both sides of the first metal plate 1 and the second metal plate 2 to press the first metal plate 1 and the second metal plate 2 together, forming a bonding line at the bonding point. There is a certain distance between the roll of the first metal plate 1 and the roll of the second metal plate 2, thus forming a V-shaped structure.

[0043] The laser emits a finely focused high-frequency scanning laser beam with a focused spot diameter of 100 μm and a power density of 7.64 × 10⁻⁶. 7 W / cm 2The scanning frequency is 90 Hz. The beam directly acts on the surface of the copper / aluminum dissimilar metal plate to be welded, which has a V-shaped structure, and performs a high-frequency line scan to rapidly heat and melt the surface material. At the same time, the pressure device 4 applies a pressure of 4000 N to the area to be welded. When the pressure device 4 rotates, it drives the copper / aluminum metal composite plate to move backward at a speed of 1 m / min, realizing large-area, high-efficiency welding of the copper / aluminum dissimilar metal composite plate.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a metal composite plate, characterized in that, include: The laser beam spot size was set to 50 μm~200 μm, and the power density was set to 5.0×10⁻⁶. 6 W / cm 2 ~5.0×10 8 W / cm 2 Scanning frequency ≥ 50 Hz; The first metal plate and the second metal plate are stacked to form a first V-shaped structure, and the first V-shaped structure is the first interface to be welded. The first interface to be welded is scanned with a high-frequency laser along the width direction of the first metal plate to form a molten pool, and the molten pool is pressed together. Along the length of the first interface to be welded, multiple high-frequency laser line scans are performed to form multiple molten pools and then pressed together, so that the first metal plate and the second metal plate at the first interface to be welded can achieve inter-plate bonding.

2. The method for preparing the metal composite plate according to claim 1, characterized in that, The step of performing multiple high-frequency laser line scans along the length of the first interface to be welded to form multiple molten pools and pressing them together to achieve inter-plate bonding between the first metal plate and the second metal plate at the first interface to be welded includes: At the first interface to be welded, a high-frequency laser line scan is performed along the first bonding line between the first metal plate and the second metal plate to form a first line molten pool. The first line molten pool is then pressed to bond the first metal plate and the second metal plate at the first bonding line. At the first interface to be welded, a high-frequency laser line scan is performed along the second bonding line between the first metal plate and the second metal plate to form a second line molten pool. The second line molten pool is then pressed to bond the first metal plate and the second metal plate at the second bonding line. Repeat the above steps until the first metal plate and the second metal plate at the first interface to be welded are completely welded together.

3. The method for preparing the metal composite plate according to claim 1, characterized in that, The step of performing high-frequency laser line scanning along the width direction of the first metal plate to form a wire weld pool on the first interface to be welded, and pressing the wire weld pool together includes: A pressure device is provided on one side of the first metal plate, or on both sides of the first metal plate and the second metal plate. When welding the first interface to be welded, the pressure device or the first metal plate and the second metal plate are controlled to move.

4. The method for preparing the metal composite plate according to claim 3, characterized in that, The preparation method includes: The pressure device is disposed on one side of the first metal plate; When welding the first interface to be welded, the pressure device is controlled to roll along the first metal plate, and at the same time, the laser source is controlled to move synchronously with the pressure device.

5. The method for preparing the metal composite plate according to claim 3, characterized in that, The preparation method includes: A pair of pressure devices are arranged opposite each other on both sides of the first metal plate and the second metal plate; When welding the first interface to be welded, the pair of pressure devices are controlled to rotate simultaneously to drive the first metal plate and the second metal plate to move.

6. The method for preparing the metal composite plate according to claim 1, characterized in that, The step of stacking the first metal plate and the second metal plate to form a first V-shaped structure, wherein the first V-shaped structure is the first interface to be welded, includes: The first end of the first metal plate is stacked with the first end of the second metal plate; At least one of the second end of the first metal plate and the second end of the second metal plate is bent to form the first V-shaped structure.

7. The method for preparing the metal composite plate according to claim 6, characterized in that, Also includes: After welding the second end of the first metal plate to the second end of the second metal plate, at least one of the first end of the first metal plate and the first end of the second metal plate is bent to form a second V-shaped structure, and the second V-shaped structure is the second interface to be welded. The second interface to be welded is subjected to high-frequency laser scanning and pressing to achieve inter-plate bonding between the first metal plate and the second metal plate at the second interface to be welded.

8. The method for preparing the metal composite plate according to claim 1, characterized in that, The opening angle of the first V-shaped structure is 45°-120°.

9. The method for preparing the metal composite plate according to claim 1, characterized in that, Before the step of stacking the first metal plate and the second metal plate to form a first V-shaped structure, wherein the first V-shaped structure is the first interface to be welded, the preparation method further includes: Set the unit length pressure of the first interface to be welded to 2 N / mm~100 N / mm.

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