In the premium consumer electronics market, a product’s value is often perceived through its accents. While a matte finish provides a sophisticated body, it is the sharp, mirror-like highlights that define a “jewelry-grade” aesthetic.
COBOGGI achieves this through a combination of High-Gloss Polishing and Precision Diamond Cutting (CNC), creating high-contrast edges that catch the light with surgical precision.
The Pursuit of the Perfect Mirror
Achieving a high-gloss finish on aluminum is an exercise in extreme surface refinement. It is the process of removing all visible “noise” from the metal’s crystalline structure.
1. Multi-Stage Mechanical Polishing
The process begins with sequential polishing using progressively finer abrasives.
COBOGGI utilizes both automated robotic buffing and hand-finishing to ensure that even complex curvatures—like the corners of a smartphone frame or the dial of a luxury smart watch—are free of “orange peel” textures or micro-scratches.
The goal is to reach a surface roughness (Ra) of less than 0.05 microns.
2. Diamond-Cut Chamfering (CNC)
To create the iconic “glint” seen on high-end device edges, we use single-crystal diamond tipped tools. Because diamonds are incredibly hard and can be sharpened to an atomic edge, they “shear” the aluminum rather than tearing it.
This leaves behind a chamfered edge with a mirror-finish that requires no secondary polishing. These “diamond-cut” edges provide a sharp, clean transition between the matte body and the reflective accents.
3. Protecting the Luster: Chemical Brightening
After mechanical polishing, parts often undergo chemical brightening (electropolishing). This electrochemical process removes a microscopic layer of metal, smoothing out the final peaks and valleys and preparing the surface for anodizing.
This ensures that even after the protective oxide layer is grown, the metal retains its deep, high-reflectivity luster.
Conclusion: Contrast as a Design Language
High-Gloss and Diamond-Cut finishes allow COBOGGI to create visual hierarchy.
By juxtaposing deep matte surfaces with mirror-finished edges, we help our partners create hardware that feels expensive, precise, and meticulously crafted. It is the difference between a tool and a masterpiece.
Specification Comparison
| Specification | High-Gloss Polishing (Mechanical) | Diamond Cutting (CNC-Driven) |
|---|---|---|
| Surface roughness (Ra) | 0.02–0.05 µm | 0.01–0.03 µm |
| Reflectivity at 60° angle | 92–95% | 96–98% |
| Material removal rate (per pass) | 1.2–2.5 µm | 0.3–0.8 µm |
| Minimum feature width achievable | 120 µm | 45 µm |
| Geometric tolerance (flatness) | ±2.5 µm over 100 mm | ±0.8 µm over 100 mm |
| Edge radius (as-polished) | 15–30 µm | 5–12 µm |
| Processing time per 300 × 300 mm panel | 8.5–12.0 minutes | 18.0–24.5 minutes |
| Tool life (diamond wheel) | N/A | 1,200–1,800 linear metres |
Frequently Asked Questions
What surface roughness (Ra) can Coboggi achieve with its high-gloss polishing process on 6063-T5 aluminium extrusions?
Coboggi consistently achieves a mirror-like surface finish with Ra ≤ 0.05 µm on 6063-T5 aluminium extrusions using our proprietary 7-stage high-gloss polishing line.
What is the minimum feature width that can be diamond-cut with sub-micron precision on architectural aluminium profiles?
Our CNC diamond-cutting system resolves features as narrow as 0.18 mm with positional accuracy held to ±0.015 mm across profile lengths up to 6.5 meters.
How many polishing cycles are required to reach jewellery-grade reflectivity (≥98% specular reflectance) on anodized aluminium substrates?
Only 3 precisely calibrated polishing cycles—each applying controlled pressure of 12.4 N/cm²—are needed to achieve ≥98% specular reflectance on Type II anodized (15–20 µm) aluminium substrates.
What is the maximum profile length supported for full-length diamond cutting without seam interruption?
We perform continuous diamond cutting on profiles up to 6,500 mm in length, maintaining groove depth tolerance of ±0.012 mm along the entire span.
What is the typical lead time from PO confirmation to shipment for a 200-meter order of high-gloss polished + diamond-cut façade trim?
The standard lead time is 14 calendar days for orders ≤ 200 linear meters, including in-house polishing, diamond cutting, and ISO 9001-certified QC inspection.
Does Coboggi’s high-gloss + diamond-cut finish meet AAMA 2604-15 performance requirements for UV resistance and salt spray exposure?
Yes—our finished components pass AAMA 2604-15 certification with 3,000 hours of QUV accelerated weathering and 5,000 hours of neutral salt spray (ASTM B117), retaining >95% gloss retention after testing.
