激振装置是梯形螺纹振动辅助冷挤压机床的核心装置,是一种基于扭矩平衡状态下的新型机械式的扭转激振装置.在介绍激振装置结构原理的基础上,对其产生的辅助振动在梯形螺纹冷挤压加工过程中所起的双重性作用进行了探究分析.一方面,探究了整个加工过程中的丝锥角振幅变化过程以及主轴转速和激振频率这两个挤压工艺参数对丝锥角振幅的影响情况,得出激振装置的振动确实有效地传递到了丝锥工作部分;另一方面,通过对机床不同工作状态下的信号进行频域分析,得出激振装置确实引起了机床部件的受迫振动.最后,通过对比传统冷挤压加工方法与振动辅助冷挤压加工方法得到梯形螺纹的加工质量和加工表面质量,得出激振装置的辅助振动的作用以有利作用为主.%The excitation device is the core device of the trapezoidal thread vibration-assisted cold extrusion machine, which is a new type of mechanical torsional vibration device based on the torque balance state. On the basis of introducing its structural principle, the dual effect of auxiliary vibration on the trapezoidal thread cold extrusion process is analyzed. On the one hand, the change of the taper angle amplitude in the whole process is explored, as well as the influence of the spindle speed and the excitation frequency on the tap angle. It is concluded that the vibration of the excitation device is effectively transmitted to the working part of the tap. On the other hand, through the frequency domain analysis of machine signals under different operating conditions, the excitation device does cause the forced vibration of machine parts. Finally, by comparing the processing quality and the processing surface quality of the trapezoidal thread obtained by the traditional cold extrusion method and the vibration-assisted cold extrusion method, it is concluded that the auxiliary vibration of the exciting device is dominated by the beneficial effect.
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