基于虚拟材料方法的龙门数控机床动态特性影响机制分析  

Influence mechanism analysis of dynamic characteristics of gantry CNC machine tool based on virtual material method

作　　者：陈勇将[1] 王二化 郭魂[1] 华洪良 刘宵阳 CHEN Yongjiang;WANG Erhua;GUO Hun;HUA Hongliang;LIU Xiaoyang(School of Aerospace and Mechanical Engineering,Changzhou Institute of Technology,Changzhou 213032,China;Changzhou Key Laboratory of Intelligent Technology for High and Manufacturing Equipment,Changzhou 213164,China)

机构地区：[1]常州工学院航空与机械工程学院,常州213032 [2]常州市高端制造装备智能化技术重点实验室,常州213164

出　　处：《现代制造工程》2021年第6期135-141,154,共8页Modern Manufacturing Engineering

基　　金：中国博士后科学基金面上资助项目(2019M651965);江苏省高等学校自然科学研究项目(20KJB460023)。

摘　　要：为了对龙门数控机床动态特性的影响机制进行分析,基于多目标优化方法获取其结合部虚拟材料模型的参数,构建了精确的结合部虚拟材料模型,从而建立了准确的龙门数控机床动力学模型,并对此方法建立的动力学模型进行了试验验证。基于此动力学模型,对龙门数控机床动态特性的影响机制进行分析,结果表明:螺栓固定结合部的虚拟材料参数对龙门数控机床的固有频率影响最大;在结合部虚拟材料参数中,弹性模量对龙门数控机床的固有频率影响最大;前三阶固有频率皆随表面粗糙度的增大而变小,而固有频率受结合部真实接触面积与名义接触面积的比值的影响情况较为复杂。In order to analyze the influence mechanism of the dynamic characteristics of gantry CNC machine tools,obtaining parameters of virtual material model of joint based on multi-objective optimization method,the accurate virtual material model of the joint was constructed,thus the accurate dynamic model of the gantry CNC machine tool was established,the dynamic model established by this method was verified by experiments.Based on this dynamic model,the influence mechanism of the dynamic characteristics of gantry CNC machine tool was analyzed:the virtual material parameters of bolted joint has the greatest influence on the natural frequency of gantry CNC machine tool;in the virtual material parameters of the joint,the elastic modulus has the greatest influence on the natural frequency of the gantry CNC machine tool;the first three natural frequencies decrease with the increase of surface roughness,but the influence of the ratio of the real contact area to the nominal contact area is more complex.

关 键 词：龙门数控机床 结合部 虚拟材料 多目标优化 固有频率 

分 类 号：TH113.1[机械工程—机械设计及理论]