Ultrasonic cutter quality inspection method and device

An ultrasonic cutter detection method, comprising the following steps:

• performing a preliminary detection by frequency amplitude detection and/or by fall-of-potential detection:
• wherein the frequency amplitude detection comprises:
• causing an ultrasonic cutter to be in a resonant state, and collecting resonant frequency and vibration amplitude of the ultrasonic cutter at a plurality of positions on the ultrasonic cutter;
• and if the resonant frequencies and the amplitudes collected all fluctuate within a normal range, determining that the ultrasonic cutter passes the preliminary detection,
• wherein the fall-of-potential detection comprises:
• contacting a detection head with the ultrasonic cutter, then causing the ultrasonic cutter to be in a resonant state, and detecting a voltage and current between a first contact point between the ultrasonic cutter and the detection head and a point on the ultrasonic cutter that is other than the first contact point detecting voltage and current between a second contact point between the ultrasonic cutter and the detection head and a point on the ultrasonic cutter that is other than the second contact point;
• and if the voltages and the currents detected all fluctuate within a normal range, determining that the ultrasonic cutter passes preliminary detection;
• and
• performing reinspection by free mode detection and by pressure mode detection,
• wherein the free mode detection comprises:
• causing the ultrasonic cutter to vibrate in a frequency range of 15 kHz to 40 kHz, identifying all resonant modes of the ultrasonic cutter in the frequency range of 15 kHz to 40 kHz and causing the ultrasonic cutter to resonate at said resonant modes, if the ultrasonic cutter does not fracture after vibrating with an amplitude exceeding a normal working amplitude by at least 20%, determining that the ultrasonic cutter passes the free mode detection, and
• wherein the pressure mode detection comprises:
• contacting the detection head with the ultrasonic cutter at a third contact point and applying a first pressure with the detection head at the third contact point on the ultrasonic cutter, wherein the first pressure exceeds a normal working pressure by at least 20%, and identifying all resonant modes of the ultrasonic cutter in the frequency range of 15 kHz to 40 kHz and causing the ultrasonic cutter to resonate at said resonant modes;
• if the ultrasonic cutter does not fracture, applying a second pressure that exceeds the normal working pressure by at least 20% to a fourth contact point between the detection head and the ultrasonic cutter, identifying all resonate modes in the frequency range of 15 kHz to 40 kHz, and causing the ultrasonic cutter to resonate at said resonant modes;
• and if the ultrasonic cutter does not fracture, determining that the ultrasonic cutter passes the reinspection.