高速铣削振动对航空整体结构件加工变形的影响

Based on the stability lobe diagram of two degrees of freedom milling system obtained by using the numerical method, two kinds of cutting conditions (stable and unstable) are selected to perform the cutting tests of aerospace monolithic components. Cutting distortion and secular distortion are measured and analyzed by using the MISTRAL 775 coordinate measuring machine (CMM), respectively. Influences of chatter on machining distortion are investigated. Machining-induced residual stresses are also simultaneously measured by using the XStress 3000. It is shown that, both cutting distortion and secular distortion are smaller in stable case; in unstable case, cutting distortion is also smaller, while secular distortion is very large, and torsion occurs in the workpiece end with larger box. Machined-induced residual stress is one of the most important factors yielding machined distortion. Therefore, worpiece, need be machined in stable conditions for subsequent assembly tasks, especial aeronautical monolithic components.