An oblique ultrasonic polishing method by robot for free-form surfaces

This paper develops a new ultrasonic machining system and methodology by which a robot polishes on free-form surfaces at an oblique angle with an elastic tool. On the basis of the theories of reflection of elastic waves and dynamic stress concentration, the conception is brought forward that ultrasonic elastic contact is not continuous, the physical process of the oblique ultrasonic polishing is studied and the cutting mechanism of the abrasive finish machining methods driven by ultrasonic vibration is ascribed to the joint action of the machining operation and shot-blasting. Experimental results verify that the new oblique ultrasonic polishing method by robot is an effective machining method for free-form surfaces.