高速 HSK 热装工具系统结合部的参数辨识

摘要

HSK 工具系统的动态特性直接影响机床的加工效率与质量，获得准确的工具系统结合部参数又是精确预测 HSK 工具系统动态特性的基础。将热装刀柄刀具结合部简化为弹簧阻尼模型，基于 Timoshenko 梁理论建立了 HSK 热装刀柄刀具结合部的有限元模型，采用弹塑性理论辨识结合部的刚度和阻尼，获得了 HSK 热装刀柄刀具结合部内沿轴向不同位置的刚度和阻尼。进而建立了 HSK热装工具系统的有限元动力学模型，分析工具系统刀尖点的频响函数。最后进行了 HSK 热装工具系统频响函数的实验测量，与理论频响函数相比较，验证了将结合部等效为弹簧阻尼的辨识方法的合理性和有效性。%The dynamic characteristics of HSK tool system affected the machine processing effi-ciency and the workpiece surface quality,The basis of accurate prediction of the dynamic characteris-tics of HSK tool system was for obtaining coupling portion precise parameters of tool system.This pa-per simplified coupling portion of HSK shrink toolholder as spring-damping model,based on Timosh-enko beam theory a finite element model of the HSK shrink-tool coupling portion was established,the stiffness and damping of coupling portion was identified by using elastoplastic theory,stiffness and damping of HSK shrink-tool coupling portion was got at different axial locations.And dynamics finite element model of HSK shrink tool system was established,frequency response function(FRF)of sys-tem tool tip point was analyzed.And experimental measurements of HSK shrink tool system FRF were made,which was compared with the theoretical FRF.Equivalent to a spring-damping the reason-able and effective identification method of coupling portion was validated.