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面铣削过程中的噪声大致上可以分为空转噪声和切削噪声,空转噪声主要由铣刀气动噪声组成.基于Ffowcs Williams-Hawkings方程建立高速面铣刀气动噪声数学模型,进行高速面铣刀空转噪声测试,噪声预测值与实验结果吻合良好.模拟刀具参数(齿数、齿距)及测试观察点位置变化的情况下面铣刀气动噪声的变化情况,研究表明面铣刀气动噪声具有方向性,结合频谱分析,发现不等距面铣刀旋转频率的峰值移到高频部分,大大降低面铣刀旋转频率处噪声,可为低噪声铣刀的设计提供理论依据.
The noise in face milling can be roughly divided into idling noise and cutting noise, and the idling noise mainly consists of pneumatic noise of milling cutter.A mathematical model of aerodynamic noise of high-speed face milling cutter is established based on Ffowcs Williams-Hawkings equation, The results show that the prediction of noise is in good agreement with the experimental results.The aerodynamic noise of the milling cutter under the condition of simulated tool parameters (number of teeth and pitch) and the change of test point position shows that the directional noise It is found that the peak value of the rotational frequency of the unequal-pitch face milling cutter is shifted to the high frequency part, which greatly reduces the noise at the rotational frequency of the face milling cutter. This provides a theoretical basis for the design of a low noise milling cutter.