柔性抛光对叶片表面波纹度影响机制研究

Research on the influence mechanism of flexible polishing on the surface waviness of blade

为掌握砂布轮柔性抛光对航空发动机叶片表面波纹度影响机制,采用傅立叶变换(FFT)分析获取了柔性抛光磨具系统振动主要频谱,利用小波分析法获取了试件柔性抛光前后表面波纹频谱信息。分析结果表明:砂布轮柔性抛光过程会产生间歇式强迫振动,且强迫振动激振频率与砂布轮转速成线性关系;砂布轮柔性抛光没有彻底去除铣削残留的波纹信息,但波纹度值显著降低;强迫振动高频信息会复印在试件柔性抛光表面,形成新的致密的规律性纹理。通过分析柔性抛光表面三维形貌证实了小波分析结果的可靠性。

In order to grasp the influence mechanism of abrasive cloth wheel flexible polishing on the surface waviness of aero-engine blades, the main frequency spectrum of the flexible polishing abrasive system vibration was obtained by FFT analysis, and the wavelet analysis method was used to obtain the surface ripple spectrum information of the specimen before and after flexible polishing.The analysis results show that: the abrasive cloth wheel flexible polishing process will produce intermittent forced vibration, and the forced vibration excitation frequency has a linear relationship with the speed of the abrasive cloth wheel;the abrasive cloth wheel flexible polishing does not completely remove the residual ripple information from milling, but waviness amplitude is significantly reduced;the information of high-frequency of the forced vibration will be copied on the specimen’s flexible polished surface to form a new dense regular texture.The reliability of the wavelet analysis results was confirmed by the analysis of the flexible polished surface 3 D topography.