运动副间隙对多连杆压力机下死点精度的影响

Effect of the Joints Clearance on The Precision of Bottom Dead Center for Multi-rod Mechanical Press

现代加工业对压力机加工精度的要求越来越高,为了探索多连杆压力机运动副间隙对精度的影响,基于ADAMS计算机仿真软件平台建立多连杆压力机动力学模型,采用冲击函数理论模拟间隙接触的碰撞,研究含间隙的运动副对刚性多连杆机构下死点重复精度的影响。结果表明:间隙的存在影响下死点的重复精度,随着转速的提高下死点波动值增大,且下死点位置的平均值向下漂移。与试验测量数据对比分析,确定出运动副间隙是影响下死点波动值的重要因素,而间隙引起的下死点漂移量占实际漂移量比例很小。

Press processing precision becomes more and more important in Modern processing industry. Based on the computer simulation software ADAMS,the dynamic modeling of multi-rod mechanical press was founded to investigate how the joints clearance for multi-rod mechanical press influence the repeat accuracy of bottom dead center. The impacts between the clearance were simulated using the theory of impulse function to reveal whether the kinematic pairs with clearance have affection on the repeat precision of the bottom dead center（ BDC） for multi-rod mechanical press. The results show that the joints clearance influences the repeat precision. The fluctuating values increase and the mean values location of BDC drift downward with the rising rotary speed. Comparing with the experimental data,it is concluded that the fluctuating values is greatly influenced by the clearance between kinematic pairs,but drift distance of BDC caused by the clearance is small.