Device for ultrasonic peening of metals

A device for the ultrasonic peening of metals comprising:

• an ultrasonic generator;
• an uncooled piezoelectric transducer operatively connected to said ultrasonic generator;
• an ultrasonic transformer operatively connected to said piezoelectric transducer;
• a working head releasably connected to said ultrasonic transformer, said working head including a holder having one or more freely moving pins extending therefrom for working a work-piece, said pins being sized and shaped to be vibrated by said transducer;
• wherein said ultrasonic generator has sufficient power to cause said pins to vibrate at amplitudes of about between 25 to 40 μm under axial loading of about 25 to 50 N for uninterrupted working of a work piece.