考虑直径和质量变化的车削工件振动建模和试验分析

根据实际车削加工过程,建立了受轴向移动三维荷载作用的工件振动力学模型,其中考虑了被加工件的直径和质量随时间变化对振动的影响.在Matlab中,对工件振动模型的运动方程进行数值求解,得到不同车削条件下,直径和质量随时间变化的工件的振动响应.计算结果表明,车削加工中工件直径和质量变化对工件振动响应影响较大,荷载移动速度也影响工件的振动幅度.车削加工试验和测量表明工件振动力学模型的计算结果与试验结果基本相吻合,该振动模型符合实际车削轴加工过程的情况.

Establishment of vibration model and experimental analyses of workpiece with variable mass and diameter in turning process

Vibration dynamic model of workpiece subjected to axially moving three-dimension load along its axis is established in turning operation according to actual turning process, in which the effect of time-varying diameter and mass of workpiece is considered. Moreover, the equation of motion of the model is solved and computed with Matlab; dynamic response of workpiece is obtained under different cutting conditions with consideration of the effect of time-varying diameter and mass of workpiece. The computational results show the time-varying diameter and mass of workpiece have an obvious influence on the dynamic response of workpiece, and moving speed of load has a distinctive effect on amplitude of vibration of the shaft. Machining the shaft in turning operation, experimental result is basically in good agreement with the computational one of the model, which accords with the actual turning operation.