锻压操作机夹持长棒料随动过程动态受力分析

研究了锻压操作机夹持长棒料锻件锻压随动过程中夹钳的受力状态。利用拉格朗日方程及有限元方法建立了包含操作机及其锻件的总体动力学方程。操作机系统建立为端部悬挂质量弹簧的Euler-Bernoulli梁模型,随动过程中因为梁上节点位移激励引起操作机系统的瞬态振动。计算结果与LS-DYNA显式有限元模型结果进行了比对,吻合良好。结果表明,对于长棒料锻件,液压机锻压的位置对操作机的动态受力有着十分显著的影响。

Analysis of dynamic force transmitted to the forging manipulator clamping a slender workpiece during the compliance motion

The dynamic force transmitted to the forging manipulator clamping a slender workpiece during the compliance motion is investigated.The dynamic equation of the forging manipulator system is established including the manipulator and the workpiece by using Lagrange equation and finite element method.The system is modeled as an Euler-Bernoulli beam with spring-mass at a sliding end,which experiences a transient vibration due to the displacement excitement of the node on the beam during the compliance motion.The results of the dynamic model are compared with the simulation results of explicit dynamic finite element program LS-DYNA,good agreements could be observed.Results show that the position where the press works along the slender workpiece plays a crucial role for the dynamic force transmitted to the manipulator.