基于ANSYS圆锯片模态分析及谐响应分析

摘要

针对ϕ2482 mm 圆锯片使用过程中出现散射状与蝌蚪状裂纹的现象，基于 ANSYS 对圆锯片进行模态分析及谐响应分析。研究表明：在700~840 Hz(即300~360 r/min)频率范围内，锯片的相邻固有频率之间的差值较小，易发生共振效应；轴孔处与距轴孔1/3~2/3圆周处的振动幅度较大，可通过在锯片轴孔两侧固定夹盘或在距轴孔1/3~2/3圆周处滚压处理减小弯曲裂纹。通过对圆锯片的谐响应分析，计算出：锯片在775~800 Hz 及725 Hz 时发生共振效应；在800 Hz 附近出现应力主峰，是产生疲劳裂纹的主要原因。为了避开共振敏感区域，推荐锯片工作转速范围为317~330 r/min、348~360 r/min。%Widely scattered and tadpole-like cracks appeared onϕ 2482 mm circular saw blade during sawing.Circular saw blade modal analysis and harmonic response analysis were carried out based on ANSYS.The results showed that the difference of circular saw blade' s natural frequency was small among 700 —840 Hz(300 —360 r∕min),which easily led to resonance effects.The vibration amplitude was lager in axis hole and 1∕3 to 2∕3 circumference from the hole.To reduce the bending crack,it was good to fix chuck on both sides of the blade or press along the 1∕3 to 2∕3 circumference from the hole. It was calculated that the circular saw blade’s resonance effects occurred at 775 —800 Hz and 725 Hz and a stress peak appeared at 800 Hz,which might be the main reason for fatigue crack.So as to avoid the resonance sensitive areas when using the circular saw blade,the blade working speed should be 317—330 r∕min or 348—360 r∕min.