大型蜗杆铣削颤振稳定性研究

Chatter Stability in Milling Process of A Large-scaled Worm Workpiece

颤振通常会降低产品质量和生产效率,缩短机床和刀具的使用寿命。针对工业现场某大型蜗杆工件铣削加工中出现的颤振问题,建立其铣削颤振数学模型,采取对时滞项进行离散化的方法,利用Floquet理论进行判稳。在不同切削加工参数下试验对比稳定与失稳状态时刀具的振动信号特征,验证稳定性理论分析的正确性,避免了铣削过程颤振的发生。

Chatter vibrations will result in poor surface finish,reduce productivity,and shorten tool life.This study was motivated by an industrial chatter problem during milling a large-scaled worm workpiece.Initially,a regenerative model of the milling process was formulated.The semi-discretization method was employed to deduce the transition matrix,following the Floquet theory was used to obtain the stability chart.Finally,milling experiments were conducted to verify the theoretical results.This study is helpful for choosing reasonable machining parameters so as to avoid chatter occurrence in milling operations.