聚氨酯泡沫辅助加固钛合金薄壁件铣削性能研究

Study on Milling Performance of Titanium Alloy Thin-Walled Parts With Polyurethane Foam Reinforcement

针对钛合金薄壁件刚度低,加工过程中容易产生振动、让刀等问题,通过采用聚氨酯泡沫辅助加固钛合金薄壁结构件来提高工件刚度,以实现钛合金薄壁件高效稳定切削加工的相关工艺理论和关键技术。设计在相同条件下采用聚氨酯泡沫填充以及未填充钛合金框类薄壁件铣削试验,对工件侧壁铣削振动加速度时域信号、加工表面质量以及让刀变形进行对比分析,并利用MATLAB软件对振动信号进行快速傅里叶变换(FFT)来进行频域对比分析。结果表明采用聚氨酯泡沫辅助加固能够显著提高钛合金薄壁件加工过程中的稳定性,改善工件加工表面质量、减小让刀变形。

For the problems of vibration, cutter back-off and so on when cutting titanium alloy thin-walled parts because of its low rigidity, research by filling polyurethane foam to improve the rigidity of titanium alloy thin-walled structure was conducted so as to realize the related process theory and key technology of effectively and stable cutting. Milling experiments with polyurethane foam reinforcement were designed and conducted compared with those without polyurethane foam reinforcement at the same condition. Vibrational acceleration time-domain signals in the milling process were analyzed and compared as well as machined surface quality and part deflection. And the signals in frequency domain obtained by Fast Fourier Transform（FFT） with MATLAB software were also analyzed and compared. Finally, the experiment results show that polyurethane foam reinforcement can significantly improve cutting stability, obtain better surface quality and reduce part deformation.