Improving the Surface Finish of Concave and Convex Surfaces Using a Ball Burnishing Process

Abstract

OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. The ball burnishing process is done to improve the surface finish of workpieces that have been previously machined. In this article we present the results of tests performed with this process that was applied to workpieces with a convex or concave surface of two different materials: aluminum A92017 and steel G10380. An experiment to do the tests was designed. The results of measurements of surface roughness are presented in this paper as well. These results are compared to those measured in the workpieces before being burnished. After that conclusions are drawn about the improvement of surface roughness applied to the workpieces through the ball burnishing process. The main innovation of this paper is that we work with concave and convex geometries. We also obtain a table of recomended parameter values for the process. Improving the

Topological surface integrity modification of AISI 1038 alloy after vibration-assisted ball burnishing

“…Shiou & Cheng (2008) [2] proved that burnishing on NAK 80 steel moulds achieved up to 90% improvement. Travieso- Rodríguez et al (2011) [3] also observed similar improvement rates on AISI 1038 concave and convex surfaces. Positive results on the increase of surface hardness due to strain hardening, were demonstrated by Loh et al (1990) [4], showing an increase by 55% after ball burnishing of a medium carbon steel alloy.…”

Study of a ball-burnishing vibration-assisted process

“…The process parameters used (shown in Table 2) were defined in relation to those obtained by Travieso-Rodriguez J.A. et al [1]. To obtain the vibration, the tool was coupled to a vibration generator with coupled plates vibrating at a frequency of 2500Hz (the sinusoidal excitation frequency that produces the resonance of the plate), which is defined in the simulation for the thicknesses, h, in this study ( Figure 3).…”

“…The spring is joined to a rod that is in contact with the coil core. The coil is inside the cylinder closed on both faces using two plates, M 1 …”

“…Ball-burnishing is defined as a technological operation that consists of plastically deforming surface irregularities by the action of the force exerted by a ball [1]. 1 This process could be performed with a conventional tool [2] or be assisted by vibration, as presented in this study.…”

“…1 This process could be performed with a conventional tool [2] or be assisted by vibration, as presented in this study. The vibration-assisted process affords a greater dislocation movement of the material work piece, which allows us to work on harder materials with less force and even improve the results of the process [3].…”