机夹式球头铣刀有限元及试验模态分析

针对加工过程中机夹式球头铣刀振动控制和铣削稳定性优化等问题,基于通用有限元软件ABAQUS建立了机夹式球头铣刀的有限元模型,对其模态特性进行有限元分析,给出了前6阶固有频率和振型;同时采用锤击激振法对球头铣刀进行了模态试验,应用模态参数识别的新技术PolyMAX方法对试验结果进行了处理,获得了模态参数识别稳态图,拾取了可能的模态频率,并将所得试验结果与有限元模态分析结果作了比较,计算了仿真值与试验值之间的误差,分析了出现误差的主要原因。研究结果表明,有限元模态分析结果与模态试验结果相吻合,模态频率误差在13%以内,较好地反映了结构的物理特性,同时验证了有限元模型的合理性,分析结果为球头铣刀振动控制和铣削稳定性研究提供了依据。

Finite element and experimental modal analysis of clip-type bah end mill

Aiming at the vibration control of chip-type ball end mill and the optimization of milling stability in the machining process, based on the general finite element analysis （FEA） software ABAQUS, FEA model of ball end mill was established, modal characteristics of ball end mill were analyzed by FEA method, and then six extended natural frequency and modal shape were given. Meanwhile hammer excitation method was adapted to conduct modal experiment, modal parameter identification method for new technology PolyMAX was applied to deal with the experimental result, the stabilization chart of modal parameter identification was obtained, the possible modal frequencies were picked, and modal experimental results were compared with the FEA result. The results indicate that the FEA results are in accordance with modal experimental results, error of modal frequency is within 13%, the physical properties of the structure are reflected preferably, and the rationality of the finite element model is validated. The analytical results can provide a basis for vibration control and milling stability study for ball end mill.