Ultrasonic Knurling Technology Creating Texture

Abstract

The sliding surface in the mechanical system is required to move smoothly and stop at the target position. The sliding surface can move and stop by applying adequate friction force. The friction force is controlled by developing technology creating small textures on the surface at a few to a few hundred micrometer intervals. If friction force is reduced by applying this technology to large area sliding surfaces of generators, machine tools and so on, the machining effect is drastically improved. On the other hand, ultrasonic vibration is used in many manufacturing fields. It is well known that surface roughness is improved and stress is reduced using ultrasonic vibration. In this study, knurling is focused on creating texture. Machining technology is developed to create wear-resistant texture on large area sliding surfaces with high precision and efficiency using ultrasonic vibration during knurling. In this paper, the effect of ultrasonic vibration on creating texture using knurling is examined by the fundamental experiment. In the experiment of making a groove on the surface with an indenter using a 2-dimensional table, pressing force and friction force are measured. These forces are reduced using ultrasonic vibration.