针对薄壁筒工件切削噪声问题，利用理论建模、数值仿真和实验分析相结合的方法，研究切削加工过程中薄壁筒振动声学特性及其与加工表面形貌的内在关联。建立薄壁筒工件辐射声场模型，根据动态切削力、结构振动和切削噪声三者之间的内在关系，数值仿真获得不同激振频率下工件表面、周围空间的声压分布情况。开展薄壁筒工件切削振动实验，分析获得切削过程中系统振动声学响应信号特性与工件表面形貌特征的映射关系；提取切削路径上声压信号振动频率的时变特征，结合工件尺寸和切削用量等参数，重构预测薄壁筒切削加工表面形貌，结果与实测表面具有一致性。研究成果可为智能制造环境下薄壁筒类零件切削表面质量的在线监测或预测提供一种新思路。
Abstract
Aiming at machining noises of thin-walled cylinder workpieces, this paper investigates the vibration acoustic characteristics and its correlation with the machined surface morphology during cutting of thin-walled cylinders with the method which combines theoretical modeling, numerical simulation and experimental analysis. The radiation sound field model of thin-walled cylinder workpieces was firstly established. Based on the internal relationship among dynamic cutting force, structural vibration and cutting noise, the acoustic pressure distribution of the workpiece surface and the surrounding space under different excitation frequencies were obtained by numerical simulation. Then, the cutting chatter experiment of thin-walled cylinder workpieces was carried out to obtain the mapping relationship between the acoustic response characteristics of the system vibration and the surface morphology characteristics of the workpiece. Furthermore, the time-varying characteristics of the vibration frequency of the sound pressure along the cutting path were extracted. Combined with the workpiece dimensional parameters and the cutting parameters, the surface topography of the thin-walled cylinder was therefore reconstructed. The results show consistency with the measured surface. The research may provide a new idea for on-line monitoring or prediction of machining surface quality of thin-walled cylinder parts in intelligent manufacturing.
关键词
薄壁筒 /
切削颤振 /
声学特性 /
表面形貌
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Key words
thin-walled cylinder /
cutting chatter /
acoustic characteristics /
surface morphology
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