JKM8凸轮轴磨床头架主轴系统动态特性分析  

Dynamic Characteristic Analysis of JKM8 Camshaft Grinding Machine Head Spindle System

作　　者：汤世炎 何勇[1] 王玉琢 

机构地区：[1]东华大学机械工程学院,上海201620 [2]江西杰克机床有限公司,江西吉安343008

出　　处：《机床与液压》2017年第23期132-136,共5页Machine Tool & Hydraulics

基　　金：国家科技重大专项项目(2015ZX04002022-004)

摘　　要：凸轮轴磨削精度主要受机床主轴系统的自激振动、受迫振动和热变形的影响,模态分析是动力学分析的基础,因此有必要深入分析主轴振型对磨削精度的影响。以JKM8凸轮轴磨床头架主轴系统为研究对象,使用弹性支承单元模拟静压轴承,建立转子-轴承系统有限元模型进行模态分析,获取系统前6阶模态参数,运用参数讨论法,研究系统固有频率随支承刚度的变化规律。结果表明:主轴转速远远低于一阶临界转速,因此不会发生共振;静压轴承的支承刚度对主轴系统的低阶固有频率影响很大,支承刚度大于300 N/μm时,固有频率的增加幅度显著减小。研究结果为磨床主轴系统的优化提供了理论依据。Camshaft grinding accuracy is mainly affected by the self-excited vibration of the machine tool spindle system, forced vibration and thermal deformation, and modal analysis is the foundation of dynamic analysis. Therefore, it is necessary to analyze deeply the influence of spindle vibration on grinding precision. By taking JKM8 camshaft grinding machine head spindle system as the research object, the finite element model （FEM） of the rotor-bearing system was established to carry out modal analysis by using the elastic supporting element to simulate hydrostatic beating, obtained the first 6 order modal parameters of the system, and the law of natural frequency of the system changes along with the supporting stiffness was studied by using the parameter discussion method. The results prove that the spindle speed is far below the first critical speed, so it would not happen resonance. The bearing stiffness of the hydrostatic bearing has great influence on the low order natural frequency of the main shaft system, and the amplitude of natural frequency increase is significantly decreased when the stiffness of the hydrostatic bearing is greater than 300 N/μm. The research results provide a theoretical basis for the optimization of spindle system of grinding machine.

关 键 词：磨削精度 模态分析 有限元 参数讨论法 

分 类 号：TG0[金属学及工艺]