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In the aircraft structure, in order to reduce the weight, a large number of thin-walled parts of aluminum alloy material are used, and since the aluminum alloy part material has a large thermal expansion coefficient, it is easily deformed during the thin-wall processing. Especially when using free forging blanks, the machining allowance is large and the deformation problem is more prominent.
There are many reasons for the deformation of aluminum alloy parts, which are related to materials, part shapes and production conditions. There are mainly the following aspects: deformation caused by internal stress of the blank, deformation caused by cutting force, cutting heat, and deformation caused by clamping force.
(1) Reducing the internal stress of the blank The natural stress of the blank can be partially eliminated by natural or artificial aging and vibration treatment. Pre-processing is also an effective process. For the blank of the big head of the fat head, due to the large margin, the deformation after processing is also large. If the excess part of the blank is processed in advance and the remaining amount of each part is reduced, not only the processing deformation of the subsequent process can be reduced, but also a part of the internal stress can be released after being pre-processed and placed for a certain period of time.
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