在現今高精密、高效率與高壽命是帶鋸機發展的主要趨勢,帶鋸機的振動幅度大小決定機台之精密度,所以掌握了帶鋸機的剛性與動態特性,將有助於研究結構的振動,以避免共振,提升帶鋸機之效率及壽命。 本文利用有限元素分析方法對臥式帶鋸機進行結構分析,分析自然頻率以及響應,探討結構自然頻率之模態振型與響應,結合田口方法品質設計的原理,得到最佳因子解,與分析帶鋸機的耗材部分鋸帶,此部分零件容易有應力集中,在鋸帶緊邊扭轉段與主動輪彎矩段為應力最大處,藉由分析軟體可以得知長度與圓徑對於應力關係,最後找出此分析長度與田口法因子之間的關係求得最佳的解答,做為改善帶鋸機結構基準,初步結果顯示在模態一減少48.2%振幅與模態二減少10%振幅,以及鋸弓零件減少22%的質量。
In the present, high precision, high cutting speed and long lifetime have become the main developing trend of band saw machine. The amplitude of vibration of the machine affects the machine accuracy. Therefore, it is important to investigate the rigidity and dynamic characteristics of the band saw machine designed in order to avoid resonance phenomena and upgrade the efficiency and lifetime of the machine. The structural analysis of a selected horizontal metal band saw machine based on 3D finite element model are conducted to obtain the structural natural frequencies and associated mode shapes, and the harmonic responses. The optimal design parameters of the band saw module based on the minimization of amplitude of lower vibration mode are also performed by the Taguchi method. The stress state into the blade is also analyzed to learn the relationship of blade length and driving wheel diameter. Finally, an improved design based on the above analysis is obtained. The preliminary results show that amplitude of vibration is reduced 48.2 % for first mode and 10 % for second mode as compared to original design.
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