In order to reduce the weight, thin-walled parts made of aluminum alloy materials are used, because aluminum alloy parts have a relatively large thermal expansion coefficient and are easily deformed during processing. So how to control the processing of easily deformable aluminum parts? The following is the answer from Shenzhen cnc precision parts processing manufacturer.　　The cause of deformation is the deformation caused by the internal stress of the blank, the deformation caused by the cutting force, the deformation caused by the cutting heat, and the deformation caused by the clamping force.　　The ways to reduce processing deformation are to reduce the internal stress of the blank, improve the cutting ability of the tool, rationally select the tool parameters, improve the tool structure, improve the clamping method of the workpiece, and rationally arrange the process.　　 For the blank with fat head and big ears, because of the large margin, the deformation after processing is also large. If the remaining part of the blank is processed in advance and the margin of each part is reduced, not only can the processing deformation of the future process be reduced, and it can be placed for a period of time after the pre-processing, but also a part of the internal stress can be released.　　Under the condition of maintaining the strength of the cutting edge, the rake angle should be appropriately selected to be larger. On the one hand, it can grind the sharp edge, and on the other hand, it can reduce the cutting deformation and smooth chip removal, thereby reducing the cutting force and cutting temperature. Never use negative rake angle tools.　　 In order to make the milling smooth and reduce the milling force, the helix angle should be selected as large as possible. Properly reducing the entering angle can improve the heat dissipation conditions and reduce the average temperature of the processing area.　　 For the processing of aluminum parts with poor rigidity, clamping methods can be selected to reduce deformation. During high-speed cutting, because of the large machining allowance and intermittent cutting, the milling process often produces oscillations, which affects the machining accuracy and surface roughness.　　 The margin left after roughing should be greater than the deformation, generally 1～2mm. During finishing, the surface of the parts should be uniformly processed. Generally 0.2~0.5mm is appropriate to keep the tool in a stable condition during the processing process, which can reduce cutting deformation, obtain outstanding surface processing quality, and ensure the product Accuracy.　　 There are better heat dissipation conditions during processing to avoid heat concentration. Symmetric processing should be used during processing. When processing, it is not advisable to choose the second processing method of one cavity for one cavity, which simply causes uneven force on the parts and deforms.　　 During down milling, the cutting thickness of the teeth gradually decreases from larger to zero, the degree of work hardening is greatly reduced, and the degree of deformation of the parts is reduced at the same time. The deformation of aluminum parts can be controlled through the above methods.