Mechanical finishing

Many different finishing options are available for extrusions. Among them are mechanical finishes.

They are used to improve the appearance of aluminium. And it is common for aluminium profiles to be anodized after mechanical finishes are applied. Specifying a mechanical finish for your extrusions can be a good way to improve their appearance. Finishes like abrasive blasting, grinding, polishing, buffing, and mass finishing can all be applied to profiles.

Abrasive Blasting

Abrasive blasting is used to smoothen a rough surface or roughen a smooth surface. And it can also be used to shape the surface or remove surface contaminants.

For this, the manufacturer uses pressurized fluid to propel a specific type of media at it. There are different types of media that can be used, including sand, metal shot, baking soda, and glass beads.

Grinding

Surface grinding creates a flat surface on your aluminium extrusions. A rotating abrasive wheel removes material from the extrusion until the desired tolerance is reached.

It is less common to grind aluminium than it is to grind steel. Aluminium tends to clog the cutting wheel because it melts more easily. But, this can be prevented with special techniques.

Polishing

Polishing aluminium gives profiles a smooth and shiny surface. After going through the profile polishing machine, they come out with a significant specular reflection.

To create this effect a soft cloth charged with abrasive grains needs to run over the extrusions.

Buffing

The process of buffing helps to smoothen the surface of the aluminium. It is similar to polishing. But, less abrasive grains are used.

Mass Finishing

These processes can be used to smooth and polish a rough surface. Tumbling is a process where parts are placed into a rotating barrel.