Investigation of vibratory bowl finishing

Abstract

Although vibratory finishing has been in commercial use for over 40 years, relatively little fundamental information is known about the process, and industrial practice remains largely based on empiricism and trial and error. An experimental investigation into the vibratory bowl finishing process was conducted using material removal rate and surface roughness as the dependent variables. Bowl performance can best be described in terms of acceleration and depends primarily on the feed weights used, while bowl loading has a relatively minor effect. Furthermore, small changes in bowl loading resulting from normal media wear can be neglected. Results showed that material removal rates were constant over time for aluminium, brass and steel and were sensitive to hardness and bowl acceleration. Surface roughness saturated after a fixed period and was primarily a function of material composition. Surface roughness did not appear to be sensitive to bowl acceleration.

Modeling of material removal mechanism in vibratory finishing process

“…(5) For the first time in vibratory finishing, the equivalent chip thickness h eq and the specific energy u were estimated based on the proposed model. (6) The estimated h eq is (10 À7 -10 À6 ) of typical values in grinding. (7) The estimated u is 200-1200 J/mm 3 which is 10-100 times higher than typical values in grinding.…”

“…Also, very small sliding motion of media on workpieces was indicated. Domblesky et al [6,7] investigated bowl type vibratory finishing processes and proposed a model to describe material removal rate. The model indicated that the rate remained constant over time and was governed by bowl acceleration, workpiece mass and velocity.…”

Modeling of vibratory finishing machines

“…Domblesky et al [14,15] conducted an experimental investigation of the vibratory finishing process, and presented the model of material removal rate as a function of bowl acceleration. Fraas [16] provided useful results in the motion analysis of granular solids in fluidized beds.…”

Design Process Control for Improved Surface Finish of Metal Additive Manufactured Parts of Complex Build Geometry

“…It can also be noted that, for the range of materials used in the study, increasing the diameter of the abrasive grain increases the volume that is removed from the workpiece. Domblesk and Dennis [13,14] suggested that the particle shape is not the only variable that controls the behaviour of manufactured abrasives. The relationship between particle shape and packing behaviour needs to be understood before the former can be used to accurately predict the wear-rate.…”