the reasons for the deformation of the workpiece in the machining of aluminum alloy parts:
1, the workpiece material and structure will affect the deformation of the workpiece
The amount of deformation and shape complexity, aspect ratio and wall thickness is proportional to the rigidity and stability of the material is proportional to. Therefore, the design of parts as much as possible to reduce the impact of these factors on the deformation of the workpiece.
Especially in the structure of large parts should be more reasonable structure. In the processing of rough hardness before, loose and other defects strictly controlled to ensure the quality of the rough to reduce the deformation of the workpiece.
2, the deformation caused by workpiece clamping
Workpiece clamping, we must first select the correct clamping point, and then select the appropriate clamping force clamping position. Therefore, as far as possible, the clamping point and the support point are the same, so that the clamping force acts on the support. The clamping point should be as close to the machined surface as possible, and the position where the force is not easy to cause the clamping deformation should be selected.
When there are several directions on the workpiece clamping force, to consider the order of the clamping force, the workpiece and the support for the contact clamping force should be the first role, and not easy too much, the main clamping force for the balance of cutting force , Should be used at the end.
Second, to increase the contact area of the workpiece and the fixture or the use of axial clamping force. Increasing the rigidity of the part is an effective solution to the problem of clamping deformation. However, due to the shape and structure of the thin-walled part, it has lower rigidity. This clamping force in the role, it will have deformation.
Increase the contact area of the workpiece and the fixture, which can effectively reduce the deformation of the workpiece when clamping. Such as milling thin-walled parts, the extensive use of elastic plate, the purpose is to increase the contact parts of the force area; in the thin-walled inner diameter and outer circle, whether it is a simple open transition ring, or the use of elastic mandrel , The whole arc claw, etc., are used to increase the contact area when the workpiece clamping. This method is conducive to carrying clamping force, in order to avoid the deformation of the parts. The use of axial clamping force, is also widely used in the production, design and production of special fixture can make the clamping force on the end, you can solve the workpiece wall thin, poor rigidity, resulting in bending deformation of the workpiece.