NEWS

In August 2026, as the final batch of products completed the black anodizing process and moved to the full inspection workshop, a large-scale order for custom (non-standard) extruded aluminum profiles—undertaken by our company—officially entered the final pre-shipment quality verification stage. These products are destined for the new energy and energy storage sectors, requiring strict adherence to standards regarding structural strength, aesthetic consistency, and dimensional precision.

We have fully documented every step of the production journey—from the arrival of raw aluminum profiles to cutting, deep processing in large CNC machining centers, deburring, selective surface brushing, and final black anodizing—transforming raw stock into precision-engineered finished products.

Raw Material Arrival: Incoming Inspection of Custom Extruded Aluminum Profiles. This order utilizes custom extruded aluminum profiles—specialized structural components created via custom die extrusion that cannot be satisfied by standard profile shapes.

Upon arrival, our Quality Control department immediately verified material composition reports and conducted visual inspections in accordance with Incoming Quality Control (IQC) protocols.

Given the complex cross-sectional shapes of these custom profiles—which demand high precision for clamping and positioning during subsequent CNC machining—the dimensional verification of incoming materials was a critical step.

Precision Sawing: Cutting Long Profiles into Machining Blanks.

Once materials passed inspection, they proceeded to the first processing stage: sawing. We cut the long extruded profiles into blanks sized to fit the clamping specifications of our CNC machining centers, strictly adhering to engineering drawing requirements.

Deep Processing in Large CNC Machining Centers: Ensuring Precision in Core Operations.

The sawn blanks were immediately transferred to large CNC machining centers for deep processing. The products feature complex structures requiring multiple operations, including slot milling, drilling, tapping, end-face machining, and the milling of irregular internal cavities. By utilizing large-scale CNC machining centers—leveraging their superior machine rigidity and stable cutting performance—we effectively mitigated the risk of bending or deformation caused by the profiles' own weight during the machining process. During machining, we fine-tuned parameters such as cutting speed, spindle speed, and feed rate to address the tendency of aluminum to adhere to the cutting tool and form built-up edges. Tolerances for critical mating dimensions are strictly controlled within a range of ±0.01 mm to ±0.05 mm, meeting the high-precision assembly requirements for non-standard structural components. High-speed operation of large-scale CNC machining centers is maintained throughout the deep processing stage, ensuring both efficiency and consistency for batch orders.

Deburring and Burr Removal: Eliminating Machining Imperfections and Enhancing Surface Quality

Following CNC deep processing, the formation of flash and burrs along product edges is inevitable—a common occurrence in aluminum CNC machining. Due to the softness of aluminum, the cutting tool's pressure against the material surface can easily create micro-scratches and burrs, which directly impact subsequent assembly performance and surface finishing results. We employ specialized deburring equipment alongside precision milling and grinding processes to thoroughly remove flash and burrs from every product. This step not only ensures operator safety (preventing injuries from sharp edges) but also provides a clean, smooth base surface for subsequent processes such as brushing and anodizing.

Selective Brushing: Imparting a Metallic Texture

After deburring, the products undergo the brushing process. Brushing involves creating continuous horizontal or vertical line patterns on designated areas of the product through mechanical friction, resulting in a surface finish characterized by metallic luster and texture. We strictly control the direction, depth, and uniformity of the brushing process to ensure consistent grain patterns and visual style across all products. The microscopic texture created by brushing not only enhances the product's aesthetic appeal but also provides an ideal foundation for uniform coloring during the subsequent anodizing stage.

Black Anodizing: Final Surface Treatment and Coloring

Once brushing is complete, the products are transferred to the anodizing workshop for black anodizing. Anodizing is an electrochemical process that creates a protective aluminum oxide (Al₂O₃) film on the surface of aluminum and aluminum alloys. Our process flow consists of: degreasing → water rinsing → alkaline etching → water rinsing → brightening → water rinsing → anodizing → dyeing → sealing → drying. After the porous oxide film is formed during the anodizing stage, black pigment is infused into the film's pores via the dyeing process, and the color is securely locked in through the final sealing treatment.

Black anodizing offers low reflectivity, a sophisticated appearance, and excellent wear and corrosion resistance; it is widely used for high-end aluminum alloy components in sectors such as industrial equipment, new energy, and electronics.

100% Inspection: A Quality Closed-Loop for Large-Volume Orders

This batch of products has completed the black anodizing process and is now moving to the inspection workshop for Final Quality Control (FQC) prior to shipment. The comprehensive inspection covers multiple dimensions, including screening for surface defects, re-verifying critical dimensions, checking the consistency of the brushed finish, and testing the anodized film thickness and color uniformity. Historically, large-volume orders in the CNC machining industry have often relied on random sampling due to the limitations of manual inspection speeds.

For this order, we are combining manual 100% inspection with high-precision testing equipment to ensure every single piece undergoes rigorous scrutiny, achieving true traceability and full documentation for every unit.

From the arrival of custom extruded aluminum profiles to cutting, deep processing in large CNC machining centers, deburring, brushing, black anodizing, and finally the comprehensive inspection—every step embodies our unwavering commitment to precision manufacturing. As orders in the CNC machining industry increasingly concentrate on top-tier facilities heading into 2026, we will continue to leverage our robust machining capabilities and rigorous quality control to deliver precision aluminum alloy products that stand the test of quality.