In the aircraft structure, in order to reduce its own weight, a large number of thin-walled parts made of aluminum alloy processing materials are used, but the thermal expansion coefficient of aluminum alloy parts is relatively large, and the thin-walled aluminum alloy is easy to make. Aluminum alloy is deformed during processing, especially when free forgings are used, the processing workload is large, and the deformation problem is more serious.BelowThis paper analyzes the causes and solutions of aluminum alloy processing deformation, hopingEverybodyIt helps.

1. Causes of processing deformation

There are many reasons for the deformation of aluminum alloy processing, which are related to the material, the shape of the part and the production conditions. There are mainly the following aspects: deformation caused by the internal stress of the blank, deformation caused by cutting force and cutting heat, and deformation caused by clamping force.

2. Processing measures to reduce aluminum alloy processing deformation

(1) Reduce the internal stress of the blank. Natural or artificial aging and vibration treatment can partially eliminate the internal stress of the blank. Pretreatment is also an effective treatment method. For the blank, due to the large margin, the deformation after processing is also large. If the excess part of the blank is pretreated and the allowance of each part is reduced, not only the machining deformation of the subsequent process can be reduced, but also a part of the internal stress can be released after the pretreatment of 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 processing of aluminum alloy. The correct choice of tools is very important to reduce the deformation of the part.

Reasonable selection of tool geometry parameters. rake angle: under the condition of maintaining the strength of the cutting edge, choose a larger rake angle. On the one hand, it can grind sharp edges, on the other hand, it can reduce cutting deformation and smooth chip removal, thereby reducing the aluminum alloy processing temperature.

Back angle: The size of the back angle directly affects the wear of the side and the quality of the aluminum alloy processed surface. Cutting thickness is an important condition for selecting the relief angle. In the rough milling process, due to the large feed speed, large cutting load and large heat generation, the tool is required to have good heat dissipation conditions. Therefore, the clearance angle should be chosen small. When finishing milling, the cutting edge is required to be sharp, reduce the friction between the side and the aluminum alloy processing surface, and reduce the elastic deformation. Therefore, the rear angle should be selected larger.