materjalide töötlemine (lihvimine, poleerimine, avade moodustamine jms) ultraheli abil, process of removing material by abrasive bombardment and crushing in which a relatively soft tool, matching the shape produced, is made to oscillate at ultrasonic frequencies and drives the abrasive grit, suspended in a liquid, against the work, blasting away fine particles of the material; operations include drilling round and odd shaped holes, diesinking and forming wire drawing dies