Device for removing oxidation film on surface to be welded of aluminum alloy for diffusion welding and working method of device

Abstract

The invention relates to the technical field of material connection, in particular to a diffusion welding aluminum alloy surface to-be-welded oxide film removing device which comprises a glove box, an aluminum alloy plate, a grinding machine and a mold core. The grinding machine comprises a grinding wheel, a driver and a stand column. The driver can drive the grinding wheel to rotate. The mold core comprises a central threaded hole, an interference fit part and a guide clearance fit part, and the mold core can be installed in a mold cavity of an aluminum alloy plate. The oxidation film removing mechanism is integrated in the protective atmosphere glove box, efficient removal of an upper aluminum alloy plate, a lower aluminum alloy plate and a middle layer oxidation film can be achieved, the flatness is guaranteed, the diffusion welding quality can be improved, and meanwhile the problems of electrochemical pollution, secondary oxidation, aluminum powder flash explosion and the like are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material connection, in particular to an aluminum alloy welding surface oxide film removal device for diffusion welding and a working method thereof. BACKGROUND

[0002] Diffusion welding is divided into dissimilar material diffusion welding and same material diffusion welding. Same material diffusion welding is mainly aimed at the connection requirements of aluminum alloy precision devices with complex inner curved cavity, flow channel, micro-hole and other special structures. Solid-phase diffusion welding has unique advantages in inhibiting structural deformation and avoiding flow channel blockage due to its non-melting connection characteristics, and is considered as an effective way to realize aluminum alloy precision welding.

[0003] The document "Influence of Al foil interlayer on performance of vacuum diffusion bonding joint of 6061 aluminium alloy, D.S. Liu, J.H. Xu, X.H. Li, et al., Journal of iron and steel research international, 2024, 31 Influence of Al foil interlayer on performance of vacuum diffusion bonding joint of 6061 aluminium alloy (10): 2404-2412." discloses a method of adding aluminum foil interlayer diffusion welding of 6061 aluminum alloy, and the obtained joint is 79 MPa, and the bonding rate is 95.91%. Compared with the joint without adding aluminum foil, the deformation rate is reduced by 1.58%, which is 8.05%. But its equipment cost is high and limited by the size of the workpiece, it is difficult to realize large-scale application.

[0004] The invention patent with application number CN202310735100.8 discloses an aluminum alloy low-temperature and low-pressure connection method based on liquid and solid phase combined diffusion, which removes the gas film and material surface oxide film by mechanical methods such as mutual friction or ultrasonic wave. But for some workpieces with special structure, the structure will fail during the implementation of mechanical methods, and the liquid metal has the risk of blocking the micro-hole.

[0005] The prior art for removing the oxide film on the welding surface of the aluminum alloy for diffusion welding is an electrochemical method. The corrosion degree of the welding surface of the aluminum alloy for diffusion welding is different when the electrochemical method is used, and the sharp edges of the welding surface of the aluminum alloy for diffusion welding and the inner cavity thereof are more severely corroded. Therefore, the planarity of the welding surface of the aluminum alloy for diffusion welding is improved by using the electrochemical method, and the corrosion crack source is formed on the inner cavity and the diffusion welding joint surface of the aluminum alloy forming part after diffusion welding. The aluminum alloy forms an oxide film at room temperature. If the oxide film is removed, the equipment needs to be processed in a protective atmosphere or vacuum, which is high in cost.

[0006] Therefore, the engineering requirement for removing the oxide film on the welding surface of the aluminum alloy for diffusion welding urgently needs to develop a new process method which is low in cost, simple in operation and practical, and provides a new solution for removing the oxide film on the welding surface of the aluminum alloy for diffusion welding. SUMMARY

[0007] In order to solve the above technical problems, the present application discloses a device for removing the oxide film on the welding surface of the aluminum alloy for diffusion welding and a working method thereof.

[0008] The specific technical solutions are as follows: A device for removing the oxide film on the welding surface of the aluminum alloy for diffusion welding, comprising a glove box, a grinding machine, an aluminum alloy plate, a core and an intermediate layer sheet. The glove box provides atmosphere protection for the whole device; The grinding machine comprises a grinding wheel, a drive and a column, the drive provides power for the rotation of the grinding wheel, and the drive is arranged on the column and can move up and down along the column; The aluminum alloy plate comprises a plurality of internal cavities, a welding surface, a cavity and a rib, and comprises a lower aluminum alloy plate and an upper aluminum alloy plate; The core comprises a central threaded hole, an interference fit part and a guide gap fit part; the interference fit part is partially interference fit to tighten the cavity; the guide gap fit part makes the core easier to be installed into the lower aluminum alloy plate and the upper aluminum alloy plate; the central threaded hole is tightened by a bolt to fix the interference fit part and the guide gap fit part, and realizes interference assembly; The core can be installed into the cavity of the aluminum alloy plate, and can also be disassembled by a special tool; the installation position of the upper surface of the core is slightly lower than the welding surface of the aluminum alloy plate.

[0009] The glove box is used for protective atmosphere, comprising gloves and a sealed door, the gloves are used for grabbing and operation, and the sealed door is used for sealing the whole glove box.

[0010] It also comprises an intermediate layer sealing barrel, which can place a vacuum-packed intermediate layer roll or a non-vacuum-packed intermediate layer roll.

[0011] Also include a tool box, internally containing scissors, for cutting the intermediate layer roll into intermediate layer pieces.

[0012] The material of the intermediate layer piece is aluminum foil.

[0013] Also include a dust collector for collecting metal dust generated by grinding.

[0014] The working method of the oxide film removing device for the welding surface of the aluminum alloy for diffusion welding specifically comprises the following steps: Step one: glove box forms argon protective atmosphere, and the dust collector is turned on; Step two: the core is assembled into the lower aluminum alloy plate with interference; Step three: the grinder removes the oxide film of the welding surface of the lower aluminum alloy plate; Step four: the core is assembled into the upper aluminum alloy plate with interference; Step five: the grinder removes the oxide film of the welding surface of the upper aluminum alloy plate; Step six: the core on the lower aluminum alloy plate and the upper aluminum alloy plate is removed; Step seven: the welding surfaces of the lower aluminum alloy plate, the intermediate layer piece and the upper aluminum alloy plate are attached to form a welding assembly; Step eight: the argon protective atmosphere in the glove box is removed, and the welding assembly is placed in a vacuum diffusion welding device for vacuum diffusion welding.

[0015] Compared with the prior art, the present application has the following beneficial technical effects: The present application adopts protective atmosphere grinding processing, which can avoid damaging the oxide film of the non-aluminum alloy welding surface, avoiding aluminum grinding secondary oxidation problem, and avoiding the biggest problem of aluminum dry grinding, i.e. flash explosion. The use of protective atmosphere operation and intermediate layer sealed barrel can solve the problem of room temperature intermediate layer oxidation, and the use of dust collector can prevent occupational diseases caused by metal dust Because the sharp edges of the welding surface of the aluminum alloy for diffusion welding and the inner cavity thereof will be corroded more severely, the use of electrochemical method for the welding surface of the aluminum alloy for diffusion welding will cause a bottleneck in improving the flatness, and the aluminum alloy formed part after diffusion welding will form a corrosion crack source at the inner cavity and the diffusion welding joint surface. The present application can avoid the chemical pollution problem of the electrochemical method and avoid the different corrosion degrees of the welding surface of the aluminum alloy for diffusion welding.

[0016] The core is assembled into the upper aluminum alloy plate with interference, which solves the problem that the different stiffness of the aluminum alloy plate caused by the inner cavity structure leads to the problem that the different places of the internal rib plate sparseness will affect the flatness after grinding. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the removing device of the present application; Figure 2 is Figure 1 a partial enlarged view at A in the middle; Figure 3 is Figure 1 a partial enlarged view at B in the middle; Figure 4 is a schematic diagram of the removal of the oxide film on the aluminum alloy surface to be welded in the present application; Figure 5 is Figure 4 a partial enlarged view at C in the middle; Figure 6 is Figure 4 a partial enlarged view at D in the middle; Figure 7 is a schematic diagram of the assembly to be welded in the present application; In the figure, 1 is a glove box; 101 is a glove; 102 is a sealing door; 2 is a lower aluminum alloy plate; 201 is a surface to be welded; 202 is a cavity; 203 is a rib; 3 is a grinding machine; 301 is a grinding wheel; 302 is a drive; 303 is a column; 4 is a core; 401 is a center threaded hole; 402 is an interference fit part; 403 is a guide clearance fit part; 5 is an intermediate layer sealing barrel; 6 is a tool box; 7 is an intermediate layer sheet; 8 is an upper aluminum alloy plate; 9 is a dust collector. DETAILED DESCRIPTION

[0018] The present application will be further described below in conjunction with the accompanying drawings, but the protection scope of the present application is not limited to the drawings.

[0019] Figure 1 is a schematic diagram of the removal device in the present application, Figure 2 is Figure 1 a partial enlarged view at A in the middle, Figure 3 is Figure 1 a partial enlarged view at B in the middle, Figure 4 is a schematic diagram of the removal of the oxide film on the aluminum alloy surface to be welded in the present application, Figure 5 is Figure 4 a partial enlarged view at C in the middle, Figure 6 is Figure 4 a partial enlarged view at D in the middle, Figure 7 is a schematic diagram of the assembly to be welded in the present application, as shown in the figure: The present application is an oxide film removal device for aluminum alloy surface to be welded in diffusion welding, which comprises a glove box 1, a grinding machine 3, an aluminum alloy plate, a core 4 and an intermediate layer sheet 7 of aluminum foil. The glove box 1 provides atmosphere protection for the whole device, including a glove 101 for grabbing and operating and a sealing door 102 for sealing the whole glove box 1.

[0020] The grinding machine 3 comprises a grinding wheel 301, a drive 302 and a column 303, the drive 302 provides power for the rotation of the grinding wheel 301, and the drive 302 is arranged on the column 303 and can move up and down along the column 303; The aluminum alloy plate comprises a plurality of internal cavities, a welding surface 201, a cavity 202 and a rib 203, including a lower aluminum alloy plate 2 and an upper aluminum alloy plate 8. The core 4 comprises a central threaded hole 401, an interference fit portion 402 and a guide clearance fit portion 403; the interference fit portion 402 is partially interference fit, which tightens the cavity 202; the guide clearance fit portion 403 makes the core 4 easier to be installed into the lower aluminum alloy plate 2 and the upper aluminum alloy plate 8; the central threaded hole 401 is fastened by a bolt, which fixes the interference fit portion 402 and the guide clearance fit portion 403, realizing interference assembly; the core 4 can be installed into the cavity 202 of the aluminum alloy plate, or can be disassembled by special tools; the upper surface of the core 4 is slightly lower than the welding surface 201 of the aluminum alloy plate.

[0021] It also comprises an intermediate layer sealing barrel 5, which can place the vacuum-packed intermediate layer roll or the non-vacuum-packed intermediate layer roll inside; it also comprises a tool box 6, which contains scissors inside, used for cutting the intermediate layer roll into intermediate layer pieces 7; it also comprises a dust collector 9, which is used to collect metal dust generated by grinding processing, to ensure safety and prevent occupational diseases.

[0022] The working method of the aluminum alloy welding surface oxide film removal device for diffusion welding, specifically comprises the following steps: Step one: form an argon protective atmosphere in the glove box 1, and turn on the dust collector 9; Step two: interference fit the core 4 into the lower aluminum alloy plate 2; Step three: remove the oxide film of the welding surface 201 of the lower aluminum alloy plate 2 by the grinding machine 3; Step four: interference fit the core 4 into the upper aluminum alloy plate 8; Step five: remove the oxide film of the welding surface 201 of the upper aluminum alloy plate 8 by the grinding machine 3; Step six: remove the core 4 on the lower aluminum alloy plate 2 and the upper aluminum alloy plate 8; Step seven: the welding surfaces 201 between the lower aluminum alloy plate 2, the intermediate layer piece 7 and the upper aluminum alloy plate 8 are attached to form a welding assembly; Step eight: remove the argon protective atmosphere in the glove box 1, and place the above welding assembly in the vacuum diffusion welding equipment for vacuum diffusion welding.

Claims

1. A device for removing oxide film from the surface of aluminum alloy to be welded in diffusion welding, characterized in that: Includes glove box (101), grinding machine (3), aluminum alloy sheet, core (4) and intermediate layer (7); The glove box (101) provides atmosphere protection for the integrated oxide film removal device; The grinding machine (3) includes a grinding wheel (301), a drive (302) and a column (303). The drive (302) provides power for the rotation of the grinding wheel (301). The drive (302) is mounted on the column (303) and can move up and down along the column (303). The aluminum alloy sheet includes multiple internal cavities (202), a surface to be welded (201), cavities (202) and ribs (203), including a lower aluminum alloy sheet (2) and an upper aluminum alloy sheet (8); The core (4) includes a central threaded hole (401), an interference fit part (402), and a guide clearance fit part (403); the upper part of the interference fit part (402) is interference-fitted to support the cavity (202); the guide clearance fit part (403) makes it easier for the core (4) to be installed into the lower aluminum alloy plate (2) and the upper aluminum alloy plate (8); the central threaded hole (401) is tightened by bolts to fix the interference fit part (402) and the guide clearance fit part (403) to achieve interference assembly.

2. The device for removing oxide film from aluminum alloy surfaces to be welded for diffusion welding according to claim 1, characterized in that: The core (4) can be installed into the cavity (202) of the aluminum alloy sheet, or it can be disassembled by special tools; the upper surface of the core (4) is installed slightly lower than the welding surface (201) of the aluminum alloy sheet.

3. The device for removing oxide film from aluminum alloy surfaces to be welded for diffusion welding according to claim 1, characterized in that: The glove box (101) is used to protect the atmosphere and includes gloves (101) and a sealing door (102). The gloves (101) are used for gripping and handling, and the sealing door (102) is used to seal the entire glove box (101).

4. The device for removing oxide film from aluminum alloy surfaces to be welded for diffusion welding according to claim 1, characterized in that: It also includes an intermediate layer sealed container (5), which can hold either vacuum-packed or non-vacuum-packed intermediate layer rolls.

5. The device for removing oxide film from aluminum alloy surfaces to be welded for diffusion welding according to claim 1, characterized in that: It also includes a toolbox (6) containing scissors for cutting intermediate rolls into intermediate sheets (7).

6. The device for removing oxide film from aluminum alloy surfaces to be welded for diffusion welding according to claim 1, characterized in that: The intermediate layer (7) is made of aluminum foil.

7. The device for removing oxide film from aluminum alloy surfaces to be welded for diffusion welding according to claim 1, characterized in that: It also includes a dust collector (9) for collecting metal dust generated during grinding.

8. The operating method of the device for removing oxide film from aluminum alloy surfaces to be welded for diffusion welding as described in claim 1, characterized in that, Specifically, the steps include the following: Step 1: Create an argon protective atmosphere inside the glove box (101) and turn on the dust collector (9); Step 2: The core (4) is interference-fitted into the lower aluminum alloy sheet (2); Step 3: Grinding machine (3) removes the oxide film from the welding surface (201) of the lower aluminum alloy sheet (2); Step 4: The core (4) is interference-fitted into the upper aluminum alloy sheet (8); Step 5: Grinding machine (3) removes the oxide film from the welding surface (201) of the upper aluminum alloy plate (8); Step 6: Remove the core (4) from the lower aluminum alloy sheet (2) and the upper aluminum alloy sheet (8); Step 7: The surfaces (201) to be welded between the lower aluminum alloy sheet (2), the intermediate layer (7), and the upper aluminum alloy sheet (8) are bonded together to form the assembly to be welded; Step 8: Remove the argon protective atmosphere inside the glove box (101) and place the above-mentioned components to be welded in the vacuum diffusion welding equipment for vacuum diffusion welding.

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