基于RCSA的多轴加工系统动态特性评估与分析

摘要

为了对多轴加工系统在主轴不同位姿时的动态特性进行定量评价和分析,基于子结构响应耦合法(RCSA)建立了机床刀具端动态特性的预测模型,采用锤击实验和有限元相结合的方法来获取主轴不同位姿时的频响函数.并从频响函数中提取动态特性评价指标.利用该方法对WHLG120 x35车铣复合加工中心的综合动态特性进行了评估与分析,指出了其加工的薄弱环节,并通过加工稳定性lobe图进行了验证.%To quantitatively evaluate the dynamic performance of the whole machine tool at the tool tip in different machining position,the prediction model for predicting the dynamic performance of machine tool at the tool tip is established based on receptance coupling substructure analysis ( RCSA) method,experimental and finite element methods are combined to acquire the machining system''s general frequency response function( FRF) ,and the dynamic performance evaluation index is extracted from the FRF. Based on this meth-od,a practical evaluation and analysis of the machining system dynamic performance is performed in the turn-milling machining center WHLG120x35 , the result reveal the weak link of the machining process,and the process stability diagram verify the result.