压力机运动副间隙模型及冲击分析

Clearance Model of Kinematic Pair of Presses and Impact Analysis

以大型伺服压力机动力学模型及实测数据为依据,在动力学仿真基础上建立起压力机运动副的刚体接触分离间隙模型。将运动副销轴及轴孔内壁假定为刚体,忽略内壁的摩擦影响,采用程序显示接触点位置从而绘出运动副间隙变化曲线,为判断冲击的发生条件提供依据。在间隙模型基础上,调节压力机的平衡缸力,加速曲线及机构偏置值,确定各控制参数对运动副冲击的影响并探讨减少运动副冲击的可能方式及依据。

Based on the dynamic model and actual measured data of a large servo press, a rigid body-contact clearance model is established for the kinematic pair by the means of dynamic simulation. The shaft and inner surface of the shaft hole of the kinematic pair are assumed to be rigid. The friction on the inner surface is neglectable. A program is developed to show the path of contract points between the shaft and shaft hole to plot the clearance changing curve of the kinematic pair, which provides the basis for judging the impact occuring condition. With this clearance model, the force of the balance cylinder, acceleration curve and offset value of presses can be adjusted, and the effect of various control parameters on kinematic pair impact is can determined. The paper also discusses the possible ways to reduce the impact on kinematic pairs and the reference for them.