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针对重载夹持机构在工作过程中存在弹性振动的情况,以压杆式夹持机构为研究对象,用五次埃尔米特多项式表示梁单元的横向位移,进一步用弹性动力分析-简化方法建立了良好反映重载夹持机构的质量矩阵、刚度矩阵及运动参数的有限元模型,得到系统的运动微分方程组,利用Newmark-β法求解其弹性位移并通过实验验证位移U1,U12,U15。结果显示:夹持机构的一阶固有频率随前臂转角β增大而增大,相应的最大锻件下偏角为0.74°;KES的弹性位移比KED的位移变化幅度减小;定性了解了摩擦力可以减少夹持机构振动的振幅,并可以延迟振动响应。
In view of the existence of elastic vibration in the work process of the heavy-duty clamping mechanism, taking the bar-type clamping mechanism as the research object, the horizontal displacement of the beam element is represented by the Hermite polynomial of five times, and further the elastic dynamic analysis The finite element model of mass matrix, stiffness matrix and motion parameters, which can well reflect the structure of the heavy-duty clamping mechanism, is established. The system of differential equations of motion is obtained. The elastic displacement is solved by Newmark-β method and the displacement U1, U12, U15 . The results show that the first natural frequency of the clamping mechanism increases with the increase of the forearm angle β, and the corresponding maximum forging deflection angle is 0.74 °. The elastic displacement ratio of KES decreases with the change of KED displacement. The frictional force The amplitude of the clamping mechanism vibration can be reduced and the vibration response can be delayed.