What are the factors affecting the machining accuracy of large metal parts?

In the machining of large metal parts, the machining accuracy of parts fundamentally depends on the tool tip of workpiece and tool, as well as the relationship between position and stress in the machining process. In the process of the contact point between the tool tip and the workpiece, the process system will produce various errors, which will affect the machining accuracy of large metal parts.
The influence of machining accuracy mainly includes the following three aspects:
1. Clamping stress deformation: under the action of clamping the workpiece, the part is easy to deform, which affects the dimensional accuracy and shape accuracy of the workpiece;
2. Cutting heating deformation; Under the heat of sheet metal cutting, the workpiece is thermally deformed, which makes the workpiece size difficult to control;
3. Part vibration deformation: under the action of cutting force (especially transverse and longitudinal cutting force), it is easy to produce vibration deformation, which affects the dimensional accuracy, shape, position accuracy and surface roughness of the workpiece.