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.