What Is the Finishing Process for CNC-Machined Polycarbonate Parts?

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CNC-machined polycarbonate parts typically undergo various finishing processes depending on the desired outcome. The specific finishing steps might vary, but here's a breakdown of some common processes:

Deburring

After the machining process, the part might have sharp edges or small burrs (raised material) left behind from the cutting tool. Deburring removes these imperfections, creating a smooth and safe finished surface. Techniques for deburring can include hand tools like files or scrapers, abrasive finishing wheels, or vibratory tumblers with abrasive media.

Polishing

Polishing creates a high-gloss finish on the polycarbonate surface. This can be desired for aesthetic reasons, especially for parts used in visible applications. Polishing can also improve the optical clarity of the part, which is crucial for lenses or transparent components. Polishing techniques can involve buffing wheels with polishing compounds or even laser polishing for a mirror-like finish.

Surface Treatments

In some cases, CNC-machined polycarbonate parts might require additional surface treatments to enhance their properties or meet specific application needs. Here are some examples:

 

Flame Retardancy: A flame retardant coating can be applied to improve the fire resistance of the polycarbonate part, making it suitable for applications with flammability regulations.

UV Protection: A UV protective coating can be applied to prevent the polycarbonate from degrading due to prolonged exposure to ultraviolet radiation, especially important for outdoor applications.

Anti-Scratch Coating: A hardcoat or scratch-resistant coating can be applied to improve the surface durability of the part and minimize scratches during use.

Adhesive Bonding: For parts requiring assembly with other materials, the surface might be treated to improve adhesion with specific adhesives.

 

The choice of finishing process depends on the desired outcome for the final part.  Some parts might only require deburring for a functional finish, while others might require polishing and additional surface treatments for specific applications.

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