下压工况下辊压机驱动辊轴的瞬态响应分析

Transient response analysis on drive roll shaft of roller press under pressure working condition

以辊压机的关键部件驱动辊轴为研究对象,用模态叠加法分析驱动辊轴在考虑初始下压的3种工况下的瞬态响应。基于机械振动学理论,构建辊轴自由振动方程。运用三维软件Solid Works,构建辊轴的实体建模。借助ABAQUS有限元软件对辊轴进行模态振动研究,获得其前10阶固有频率和振型,计算结果表明辊轴临界转速为13209. 6 r·min-1,高于其实际最大转速40 r·min-1,辊轴不会出现共振。振型分析表明,辊轴前10阶振型是弯曲振动和扭转振动,辊轴位移变形量随振动阶数提高而增大,最大变形发生在齿轮及轴端处。动态特性表明,辊轴的应力、位移及动能变化受模具安装位置与定位挡板的间距影响,且间距越远影响越大,影响最大的是模具安装位置距离定位挡板320 mm处。

For the drive roll shaft being the key part of roller press,the transient responses of the drive roll shaft under three initial pressures were analyzed by modal superposition method,and the free vibration equation of the drive roll shaft was constructed by the theory of mechanical vibration theory.Then,the physical modeling of the drive roll shafts was built by 3D software SolidWorks,and the modal vibration study of the drive roll shaft was conducted to obtain its first ten order natural frequencies and vibration models with the help of finite element software ABAQUS.The calculation results show that the critical rotating speed of the roll shaft is 13209.6·min^-1,which is higher than the actual maximum speed of 40·min^-1,and the roll shaft is not resonant.The vibration mode analysis shows that the first ten vibration modes of the roll shaft are the bending vibration and torsional vibration,and the deformation of the roller shaft increases with the increase of vibration order number,and the maximum deformation occurs at the gear and shaft end.Dynamic characteristics show that the changes of stress,displacement and kinetic energy of roll shaft are affected by the space between mold installation location and positioning baffle,the farther the space is,the greater the influence is,and the influence reaches the maximum when the space between mold installation location and positioning baffle is 320 mm.