The vibrofinishing (or tumbling) is a mass finishing process which allows to modify the surface roughness of objects (usually metal parts) in order to improve their appearance and functionality. This type of technology allows to optimize the processing costs through the flexibility of the equipment required and the reduced labor costs.
The vibrofinishing (or tumbling) is achieved by combining the following three systems:
The simultaneous interaction of the three systems allows to the abrasive media to modify the surface appearance in a gradual and uniform way.
removal of sharp edges created during the production of the article – in this phase a ceramic abrasive (consisting of abrasive material only) is mainly used for hard materials, or a plastic abrasive (with organic binder) for softer materials
during this phase the edges are “compacted” and the roghness is reduced – this operation is performed mainly by plastic abrasive, preferable for its modular action compared to those ceramic
further reduction of the degree of roughness to obtain a bright surface – it’s usually performed by a low degree of abrasion media (porcelain – high density) in combination with polishing pastes / liquid additives
type of polishing that allows to achieve a shiny surface without changing the roughness – this process is performed with stainless steel media, which allow short working times
The efficiency of these steps can be optimized by assisting the mechanical action with chemical additives: with the addition in the working system of suitable chemical products (liquid or powder), it’s possible to perform the following actions: