Diffusion stretching and chemical milling composite forming method for aluminum alloy multi-layer board
A composite forming and stretch forming technology, applied in the field of thermoforming, can solve the problems of low surface quality, long production cycle and high production cost of structural parts, and achieve the effects of saving manpower, low production cost and short production cycle
Pending Publication Date: 2021-05-14
BEIJING HANGXING MACHINERY MFG CO LTD
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Problems solved by technology
The superplastic forming / diffusion bonding method has a long production cycle and high production cost, and is not suitable for the forming of large batches and parts. In addition, the forming is carried out under high pressure, which puts forward higher requirements for thermoforming equipment
The welding forming method is to form first and then weld. The welding is difficult, the tooling is complicated, and the surface quality of the structural parts is low, which is prone to welding deformation.
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Embodiment Construction
[0033] The invention proposes an integral forming tool for the aluminum alloy multilayer board sandwich structure, including diffusion connection and stretch forming tool. The forming method makes the tooling very simple and the operation method is simple and easy.
[0034] Diffusion connection tooling and stretch forming tooling are designed and processed according to the size of the structural parts, and the forming process is described in detail by taking an aluminum alloy three-layer sandwich structure as an example. The upper and lower layers of thick panels and the middle layer of thin core board are pickled first, the purpose of which is to remove the oxide layer on the surface and prepare for the subsequent diffusion connection.
[0035] according to figure 1 As shown, a layer of solder resist is evenly coated on the non-diffusion connection position on the lower side of the upper panel, the upper and lower sides of the middle core board, and the upper side of the low...
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The invention provides a diffusion stretching and chemical milling composite forming method for an aluminum alloy multilayer board, which is suitable for forming a light multilayer sandwich structural part, a tool does not need to be changed, three-layer, four-layer and even multi-layer board sandwich structural parts can be formed by designing the number of layers of middle core veneers and the positions of connecting points, and the product is mainly applied in the field of aerospace. According to the method, the sandwich structural parts of the aluminum alloy multilayer board are formed by adopting the diffusion stretching and chemical milling composite forming method, compared with a superplastic forming / diffusion bonding method, high-pressure gas does not need to be inflated during forming, the safety coefficient is higher, the operation is simpler, the production period is short, and the production cost is low. Compared with welding forming, the method has the advantages that the tool is simpler, the production efficiency is higher, the surface of the structural part is free of welds, welding deformation is avoided, and the forming quality is higher.
Description
technical field [0001] The invention belongs to the field of thermoforming processing, and relates to a welding and overall forming tool and a forming method of an aluminum alloy multilayer board sandwich structure. Background technique [0002] Due to its low density, high specific strength and specific stiffness, and good plasticity and easy deformation, aluminum alloy sheets are mostly used in automobiles, aviation, aerospace and other fields. The role of the ribs ensures that the strength and rigidity of the parts meet the requirements of use. [0003] The existing processing methods of aluminum alloy multilayer sandwich structures are superplastic forming / diffusion bonding and welding forming. The superplastic forming / diffusion bonding method has a long production cycle and high production cost, and is not suitable for the forming of large batches and parts. In addition, the forming is carried out under high pressure, which puts forward higher requirements for thermofo...
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IPC IPC(8): B21C37/02
CPCB21C37/02
Inventor 何慧敏刘伟李保永秦中环刘吉琛张天麟丁科迪刘玉平韩冰
Owner BEIJING HANGXING MACHINERY MFG CO LTD