The invention discloses an all-electric
ultrasonic drilling machine and a drilling method thereof. The all-electric
ultrasonic drilling machine comprises a rotating mechanism, a feeding mechanism, an ultrasonic vibrating mechanism, a supporting mechanism and a
control system. According to the destruction by ultrasonic frequency vibrational
impact and rock
resonance, ultrasonic frequency vibrating force, pressure and rotational force are combined so that cracks of rock propagate at higher speed to arrive at
resonance-fatigue breaking, and this mode has the advantages of higher rock-breaking efficiency, higher energy
utilization rate and low
slurry usage. The ultrasonic frequency vibrational force generated by piezoelectric
ceramic is applied to rock through the ultrasonic vibrating mechanism, rock-breaking efficiency of the drilling
machine is greatly improved, the service life of a
drill bit is greatly extended, and ultrasonic frequency vibrational drilling is achieved. In normal rotational vibrational drilling, the all-electric
ultrasonic drilling machine of the invention can provide stable
resonance-fatigue destruction under a frequency the same the inherent frequency of rock, hard
rock breaking strength is reduced, bulk breaking is achieved, drilling speed is greatly increased, and drilling cost is greatly reduced.