in aircraft structure, in order to reduce the weight, a large number of aluminum alloy materials are used for thin-walled parts. Because of the large thermal expansion coefficient of the aluminum alloy parts, the thin-walled processing process is easy to deform. Especially when using free forging blanks, the machining allowance is large and the deformation problem is more prominent.
the reason of machining deformation: there are many reasons for the deformation of aluminum alloy parts, which are related to material, parts shape, production conditions and so on. It is mainly caused by deformation caused by internal stress, cutting force, deformation caused by cutting heat and deformation caused by clamping force.
(1) reduce the internal stress of the blank; natural or artificial aging and vibration treatment can partially eliminate the internal stress of the blank. Pre processing is also an effective process. As for the blank of fat ears, the deformation is large after processing because of the large allowance. If the redundant part of the blank is processed in advance and the allowance of each part is reduced, it can not only reduce the deformation of the process in the future, but also place a period of time after the process in advance, and can also release a part of the internal stress.
(2) improve the cutting ability of the tool, the material and geometric parameters of the tool have an important influence on the cutting force and the cutting heat, and the correct choice of the cutting tool is very important to reduce the deformation of the parts.
of course, there are other reasons for the deformation of the parts in the process. The operation method is one of the important reasons. It needs to accumulate experience. More information about machining and precision parts processing is concerned about Hangzhou Yu Chen Machinery Co., Ltd.
technological measures to reduce processing deformation: