Tribological properties of vibro-mechanical texturing during face turning processes

Abstract

The surface modification process with specific characteristics is an important subject to achieve the high-performance contact behavior of pair surfaces. (Low frequency) vibration-assisted machining is one of the interesting processes which fabricates large-scale textures. This process can fabricate textures with various geometries in regular periodic distances. Current research develops a novel configuration that employs low-frequency vibrations during face turning to fabricate various textures on the surface of Al-7075 flexibly and efficiently. Process characteristics (rotational speed and feed) are controlled to adjust texture geometry.Results showed that the dimple length has a direct relation to the rotational speed. However, dimples number presented a reverse relation to the feed and rotational speed. Reducing rotational speed from 90 to 31.5 rpm could decrease the dimple length up to 73% and increase the dimples number up to 68%. Texture density was evaluated according to surface parameters of Sdr and Sds. Contrasting effects of mentioned parameters on the wettability achieved the minimum contact angle in the optimum rotational speed of 63 rpm. In the same procedure and the case of the friction coefficient, the rotational speed of 45 rpm was determined as the optimum condition with the smallest friction coefficient. The optimum condition has been determined for the developed configuration and assumed constant and variable (specific variation interval) parameters.

Keywords

• Vibration
• Face turning
• Texture
• Rotational speed
• Feed
• Density