Assurance of microgeometric state of parts surface made of plastic materials by ultrasonic machining

Abstract

The possibility for using of surface plastic deformation when applying ultrasonic vibrations to the instrument to form microgeometric state of the parts surface made of copper M1 and aluminum alloy D16 are studied. Two ultrasonic machining schemes are compared: when the direction of vibration is normal to the surface of the part and tangent to this surface. It is shown that the use of tangent scheme changes the interaction nature of the tool with the surface of the part and the trajectory of the tool motion. It is established that the angle β between the direction of the rotation speed vector of the part and the vibration speed vector of the tool significantly affects on the microgeometry being formed. Therefore, angle β together with the main motion speed, feed, static load, frequency and amplitude of the tool’s vibrations, is technological parameter that extend the capabilities of tangential scheme in surface roughness forming. It is revealed that processing according to this scheme allows escaping the intensive flow of material in the deformation zone and the formation of waves on the surface of the part.