基于结合部的HSK主轴-刀柄系统动态特性分析

Dynamic PropertyAnalysis of HSK Spindle-toolholder System Based on Joint Part

建立了HSK主轴-刀柄结合部的有限元模型(FEM),利用弹性理论和黏性阻尼理论辨识结合部内各位置的刚度和阻尼参数。提出将HSK主轴刀柄系统分为HSK主轴、主轴刀柄结合部和刀柄三部分:HSK主轴与刀柄简化为多段Timoshenko梁,并使用响应耦合法来计算其频响函数;主轴刀柄结合部简化为多点弹簧阻尼模型,采用多点响应耦合法来计算其频响函数;将各个部件的频响函数进行刚性耦合,进而获得基于结合部的HSK主轴-刀柄系统频响函数。分别假定HSK主轴刀柄结合部为刚性连接、5点弹性连接和7点弹性连接,计算其频响函数,并与实验结果相比较得到相应的结论。

The HSK spindle-toolholder FEM was modeled and the stiffness and damp parameters of joint part were identified with elastic theory and damp theory.The HSK spindle-toolholder system could be divided into three parts, such as HSK spindle,spindle-toolholder joint part and toolholder. HSK spindle and toolholder could he simplified as Timoshenko beam, and the FRF could be gained with receptance coupling theory.The spindle-toolholder ioint part might be simplified as spring-clamp model,and the FRF could be achieved with multi-points receptance coupling theory. Then the FRF of system was gained with rigid coupling theory.The spindle-toolholder was treated as rigid connection, five-points connection and seven-points connection,and the tip-point FRFs of system were computed. At last, comparing these FRFs with experimental FRF, some results may be obtained.