Creating an appropriate edge and surface finish on extruded and cut aluminum parts that need to be anodized requires both deburring and a smooth surface finish. Anodizing creates a protective oxide layer which can range from a matte to a high polish finish. A major factor in the aesthetics of the final anodized part is based on the pre-anodized surface finish.
Extruded and cut
This aluminum part was extruded and cut to size. The part shows an uneven, rough surface finish, sharp edges and burrs. There are also aluminum shavings and scratches that need to be cleaned and removed.
Vibratory tumbling the aluminum parts with a Ceramic Media will produce a beautifully rounded edge and smooth, matte surface finish. The cycle time will be short (as little as 30 minutes) but the anodized finish will typically be a smooth, matte finish.
Tumbling the part for a slightly longer time with a less aggressive Synthetic Media will also result in a deburred, slightly rounded edge but a much smoother, more uniform surface finish. A slightly longer cycle time with a ‘softer’ media will significantly improve the anodized finish resulting in a bright, polished part.