Preparation method of aluminum-magnesium explosive composite board

Abstract

The invention discloses a preparation method of an aluminum-magnesium explosive composite plate. The preparation method comprises the following steps: (1) manufacturing a stable tool according to the size and thickness of an AZ73 magnesium alloy plate; (2) polishing the 6013 aluminum alloy plate and the AZ73 magnesium alloy plate; (3) the AZ73 magnesium alloy plate is installed in a stable tool, and then preheating is conducted; (4) the AZ73 magnesium alloy plate serves as a base plate, a plurality of conventional supporting blocks are placed on the upper end face of the AZ73 magnesium alloy plate, and a plurality of auxiliary supporting blocks are distributed in the supporting blocks and the edges of the periphery of the AZ73 magnesium alloy plate; (5) the 6013 aluminum alloy plate is placed on a plurality of auxiliary supporting blocks, and the upper end face of the 6013 aluminum alloy plate is fully paved with powdery emulsion explosives with the thickness being 30-40 mm; and (6) a detonator is placed on the long edge of the 6013 aluminum alloy plate and is firmly fixed, explosive cladding is carried out, and the aluminum-magnesium explosive cladding plate is obtained. The fitting rate of the prepared aluminum-magnesium explosive composite board can reach 99.9%, and the shearing strength tau b can reach 80 Mpa or more.

Description

Technical Field

[0001] This invention relates to the field of explosive composites, and specifically to a method for preparing an aluminum-magnesium explosive composite plate. Background Technology

[0002] Magnesium materials are characterized by low density, high strength, high elastic modulus, good heat dissipation, good vibration damping, strong impact load resistance, and good resistance to corrosion from organic substances and alkalis.

[0003] Magnesium alloys are alloys composed of magnesium as a base and other elements, with a density of approximately 1.8 g / cm³. 3 Magnesium alloys possess advantages such as high specific strength and specific stiffness, and good thermal and electrical conductivity. Furthermore, they offer excellent electromagnetic shielding, damping, vibration reduction, machinability, low processing costs (processing energy is only 70% of that of aluminum alloys), and ease of recycling. Magnesium alloys have a higher specific strength than aluminum alloys and steel, but slightly lower than fiber-reinforced plastics, which have the highest specific strength. Their specific stiffness is comparable to aluminum alloys and steel, and far exceeds that of fiber-reinforced plastics. Their wear resistance is much better than low-carbon steel, surpassing even die-cast aluminum alloy A380. Their vibration reduction and magnetic shielding properties are far superior to aluminum alloys. These characteristics make magnesium materials sometimes more valuable than aluminum and plastics in automotive structural material applications.

[0004] With the rapid development of China's new energy industry in recent years, many companies have begun to explore the use of aluminum-magnesium composite materials for resource integration. Currently, several large mobile phone manufacturers are preparing to use aluminum-magnesium composite plates to manufacture mobile phone hardware. Magnesium alloy plates have low density, and for the same weight, magnesium alloy components can withstand greater loads and are more rigid than aluminum alloy or steel components. The damping performance of magnesium alloy is 10-25 times that of aluminum alloy and more than 100 times that of steel, effectively absorbing vibration and noise. It is very suitable for manufacturing components that require reduced vibration and noise. Furthermore, magnesium alloy has low cutting resistance, low tool wear, and low processing energy consumption. It also has good heat dissipation and electromagnetic shielding properties, effectively shielding electromagnetic interference (EMI), making it suitable for electronic device housings. Therefore, research has been conducted on aluminum-magnesium composite plates. The mechanism of explosive bonding utilizes the energy generated by an explosive explosion to propel the composite plate towards the substrate at high speed, generating a high-speed jet that achieves interatomic metallurgical bonding. The explosion process generates a jet that self-cleans the surface of the composite plate, allowing fresh metal to bond.

[0005] However, magnesium alloys and aluminum alloys have significantly different plastic deformation capabilities. During the rolling process, due to the mismatch between their coefficients of thermal expansion and rheological stress, the composite plate interface is prone to warping, edge cracking, or delamination. Therefore, how to prepare an aluminum-magnesium composite plate with a high bonding rate has become one of the urgent problems to be solved. Summary of the Invention

[0006] The purpose of this invention is to provide a method for preparing an aluminum-magnesium explosion-proof composite plate, wherein the prepared aluminum-magnesium explosion-proof composite plate can achieve a bonding rate of 99.9% and a shear strength of τ. b ≥80Mpa.

[0007] This invention proposes a method for preparing an aluminum-magnesium exploded composite plate. According to an embodiment of the invention, the method includes the following steps:

[0008] (1) A stabilizing fixture is made according to the size and thickness of the AZ73 magnesium alloy plate, and the stabilizing fixture is in the shape of a U-shape;

[0009] (2) Grind the 6013 aluminum alloy plate and AZ73 magnesium alloy plate to make the explosive bonding surface flat, clean and smooth;

[0010] (3) Install the AZ73 magnesium alloy plate in the stabilizing fixture, and then preheat it to 250°C;

[0011] (4) Using AZ73 magnesium alloy plate as substrate, place several conventional support blocks that are evenly distributed on its upper surface, and distribute several auxiliary support blocks within the edges of the support blocks and the AZ73 magnesium alloy plate, and ensure that the auxiliary support blocks are evenly distributed.

[0012] (5) Place the 6013 aluminum alloy plate on several auxiliary support blocks, and cover the upper surface of the 6013 aluminum alloy plate with powdered emulsion explosive with a thickness of 30~40mm.

[0013] (6) Place a detonator on the long side of the 6013 aluminum alloy plate and secure the detonator, and perform explosive composite to obtain the aluminum-magnesium explosive composite plate.

[0014] In addition, the method for preparing an aluminum-magnesium exploded composite plate according to the above embodiments of the present invention may also have the following additional technical features:

[0015] In some embodiments of the present invention, in step (1), the stabilizing fixture has the same thickness as the AZ73 magnesium alloy plate.

[0016] In some embodiments of the present invention, in step (4), a layer of cardboard is placed between the AZ73 magnesium alloy plate and the foundation, and the upper surface of the AZ73 magnesium alloy plate is wiped with acetone.

[0017] In some embodiments of the present invention, in step (5), the parameters of the powdered emulsion explosive are as follows: detonation velocity ≥1700m / s, heat of explosion 2698KJ / Kg, detonation temperature 2234℃, detonation pressure 452Mpa, and density 0.65~0.95g / cm³. 3 , with a thickness ≥13mm.

[0018] In some embodiments of the present invention, in step (5), the lower end face of the 6013 aluminum alloy plate is wiped with acetone, butter is evenly applied to the upper end face of the 6013 aluminum alloy plate with a brush to form a buffer layer, and a gun frame is placed around the upper end of the 6013 aluminum alloy plate to prevent the powdered emulsion explosive from scattering, and the powdered emulsion explosive is laid in the gun frame.

[0019] In some embodiments of the present invention, the thickness of the buffer layer is 1 mm.

[0020] In some embodiments of the present invention, in step (6), the lead wire of the detonator is connected 50m away from the explosion site.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1) Because the elongation of AZ73 magnesium alloy plate is low, only 4%~15%, and its hardness is low enough to withstand the energy impact generated by the explosion, the present invention first puts a stabilizing fixture around the AZ73 magnesium alloy plate with the same thickness. The characteristic of the explosion composite plate is that the energy it bears is greater towards the edge. The purpose of the stabilizing fixture is mainly to unload the edge energy.

[0023] 2) A large amount of powdered emulsion explosive is laid on a 6013 aluminum alloy plate. Through angled installation at the explosion site, continuous welding is achieved. The final exploded composite plate undergoes ultrasonic testing, achieving a bonding rate of over 99% and a minimum shear strength τ. b ≥80Mpa. Attached Figure Description

[0024] Figure 1 This is a top view of the installation of the stabilizing tooling and the AZ73 magnesium alloy plate in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the installation of the aluminum-magnesium explosion-proof composite plate in an embodiment of the present invention;

[0026] In the diagram, 1. Detonator, 2. Explosive, 3. Buffer layer, 4. 6013 aluminum alloy plate, 5. Support block, 6. AZ73 magnesium alloy plate, 7. Foundation, 8. Stabilizing fixture. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.

[0028] A method for preparing an aluminum-magnesium explosion-proof composite plate includes the following steps:

[0029] (1) such as Figure 1 As shown, a stabilizing fixture 8 is made according to the dimensions and thickness of the AZ73 magnesium alloy plate 6. The stabilizing fixture 8 is U-shaped and has the same thickness as the AZ73 magnesium alloy plate 6, which is 10mm thick. The plate size is 350mm × 250mm (L × W). Including the dimensions of the stabilizing fixture 8 around the plate, the total plate size is 550mm × 450mm (L × W).

[0030] (2) Grind the 6013 aluminum alloy plate 4 and the AZ73 magnesium alloy plate 6 to make the explosive bonding surface flat, clean and smooth. The thickness of the 6013 aluminum alloy plate 4 is 6mm and the plate size is 600mm×500mm (L×W).

[0031] (3) As the temperature rises, the non-basal slip system of the magnesium alloy plate is activated, the plasticity increases sharply, and it becomes very easy to form. Therefore, the AZ73 magnesium alloy plate 6 is installed in the stabilizing fixture and then preheated to 250°C.

[0032] (4) such as Figure 2 As shown, select several conventional support blocks that meet the requirements and several auxiliary support blocks that are 2mm higher than the conventional support blocks. Put a layer of cardboard between the AZ73 magnesium alloy plate 6 and the foundation 7. Wipe the upper surface of the AZ73 magnesium alloy plate 6 with acetone. Using the AZ73 magnesium alloy plate 6 as the base, place several conventional support blocks that are evenly distributed on its upper surface. Distribute several auxiliary support blocks within the edges of the support blocks and the AZ73 magnesium alloy plate, and ensure that the auxiliary support blocks are evenly distributed.

[0033] (5) The main explosive selected is powdered emulsion explosive 2. The parameters of powdered emulsion explosive 2 are: detonation velocity ≥1700m / s, heat of explosion 2698KJ / Kg, detonation temperature 2234℃, detonation pressure 452Mpa, and density 0.65~0.95g / cm³. 3 Stretch (compression value of lead column) ≥13mm;

[0034] (6) Wipe the lower end face of the 6013 aluminum alloy plate 4 with acetone, place the 6013 aluminum alloy plate 4 on several auxiliary support blocks, apply butter evenly to the upper end face of the 6013 aluminum alloy plate with a brush to form a buffer layer 3 with a thickness of 1mm, and place a powder frame around the upper end of the 6013 aluminum alloy plate 4 to prevent the powder emulsion explosive from scattering, lay the powder emulsion explosive 2 in the powder frame, and cover the upper end face of the 6013 aluminum alloy plate 4 with a thickness of 30~40mm of powder emulsion explosive.

[0035] (6) Place detonator 1 on the long side of 6013 aluminum alloy plate 4 and secure detonator 1. Connect the lead wire of detonator 1 to a distance of 50m from the explosion site and perform explosion composite to obtain the aluminum-magnesium explosion composite plate.

[0036] (7) After the explosion and recombination, the initiation point is located at the edge and can be cut off when heat treatment and leveling are performed.

[0037] The bonding rate and shear strength of the prepared exploded composite plate were tested. The bonding rate reached over 99.9%, and the shear strength τ... b ≥80Mpa.

[0038] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the present invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A method for preparing an aluminum-magnesium explosion-proof composite plate, characterized in that, Includes the following steps: (1) A stabilizing fixture is made according to the size and thickness of the AZ73 magnesium alloy plate, and the stabilizing fixture is in the shape of a U-shape; (2) Grind the 6013 aluminum alloy plate and AZ73 magnesium alloy plate to make the explosive bonding surface flat, clean and smooth; (3) Install the AZ73 magnesium alloy plate in the stabilizing fixture, and then preheat it to 250°C; (4) Using AZ73 magnesium alloy plate as substrate, place several conventional support blocks that are evenly distributed on its upper surface, and distribute several auxiliary support blocks within the edges of the support blocks and the AZ73 magnesium alloy plate, and ensure that the auxiliary support blocks are evenly distributed. (5) Place the 6013 aluminum alloy plate on several auxiliary support blocks, and cover the upper surface of the 6013 aluminum alloy plate with powdered emulsion explosive with a thickness of 30~40mm. (6) Place a detonator on the long side of the 6013 aluminum alloy plate and secure the detonator, and perform explosive composite to obtain the aluminum-magnesium explosive composite plate.

2. The method for preparing an aluminum-magnesium explosion-proof composite plate according to claim 1, characterized in that: In step (1), the stabilizing fixture has the same thickness as the AZ73 magnesium alloy plate.

3. The method for preparing an aluminum-magnesium explosion-proof composite plate according to claim 1, characterized in that: In step (4), a layer of cardboard is placed between the AZ73 magnesium alloy plate and the foundation, and the upper surface of the AZ73 magnesium alloy plate is wiped with acetone.

4. The method for preparing an aluminum-magnesium explosion-proof composite plate according to claim 1, characterized in that: In step (5), the parameters of the powdered emulsion explosive are as follows: detonation velocity ≥1700m / s, heat of explosion 2698KJ / Kg, detonation temperature 2234℃, detonation pressure 452Mpa, and density 0.65~0.95g / cm³. 3 , with a thickness ≥13mm.

5. The method for preparing an aluminum-magnesium explosion-proof composite plate according to claim 1, characterized in that: In step (5), the lower end face of the 6013 aluminum alloy plate is wiped with acetone, and butter is evenly applied to the upper end face of the 6013 aluminum alloy plate with a brush to form a buffer layer. A powder frame is placed around the upper end of the 6013 aluminum alloy plate to prevent the powdered emulsion explosive from scattering, and the powdered emulsion explosive is laid in the powder frame.

6. The method for preparing an aluminum-magnesium explosion-proof composite plate according to claim 5, characterized in that: The thickness of the buffer layer is 1 mm.

7. The method for preparing an aluminum-magnesium explosion-proof composite plate according to claim 1, characterized in that: In step (6), the detonator lead is connected 50m from the explosion site.

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