Vibratory finishing is widely used for deburring, edge rounding, cleaning, and polishing metal parts. However, scratches and unwanted surface marks can sometimes occur when the process is not properly controlled.
The first factor to check is abrasive media. Media that is too large, too aggressive, or unsuitable for the workpiece can create excessive contact and surface damage.
Media cleanliness is equally important. Broken or contaminated media can introduce unwanted particles into the process and cause scratches.
The loading ratio should also be controlled. If too many parts are loaded into the machine, the workpieces may collide with each other. Separating parts with suitable media can reduce direct contact.
Machine vibration intensity and processing time also influence surface quality. Excessive vibration or unnecessarily long cycles may increase the risk of surface damage, especially for soft metals such as aluminum.
For sensitive components, manufacturers should consider using smaller or softer media and lower processing intensity.
Another effective approach is to separate deburring and polishing into different process stages. A stronger media can be used for burr removal first, followed by a finer media for surface refinement.
Preventing scratches is therefore not based on one machine setting. It requires coordinated control of media type, media size, machine intensity, loading ratio, and processing time.
Sample testing is recommended before applying a finishing process to mass production.
