JLCCNC Appearance Standard Guidelines

This article aims to provide a clear and unified set of standards and guidelines for product appearance inspection. By defining different levels of appearance requirements, we expect to ensure product functionality while meeting aesthetic and quality demands across various scenarios. This document elaborates on specific acceptance criteria for common appearance issues such as racking points, scratches, color variation, tool marks and so on. We offer two tiers of specifications: "Standard Appearance Requirements" and "Strict Appearance Requirements". Furthermore, the article concludes with special notes on processes such as bead blasting and anodizing, intended to help relevant personnel mitigate potential process risks and ensure ultimate product quality.

Appearance Details

Standard Appearance Requirements: Suitable for scenarios where structural functionality takes priority.

Strict Appearance Requirements: Suitable for products of important purpose with strict appearance demands. For aluminum materials, please select 'Bead blasting + Anodizing treatment' to ensure uniform surface texture of the product and meet the appearance requirements of being flawless and free from obvious defects.

Premium Appearance Requirements: Suitable for high-end display scenarios. For aluminum alloy parts, "bead blasting +anodizing" shall be adopted to ensure uniform surface texture and meet flawless appearance requirements.

Notes

Bead Blasting Process

• Deformation Risk for Thin-Walled Parts: Excessively thin workpieces may undergo significant deformation under the impact force of bead blasting. Therefore, if bead blasting is required, it is recommended to increase the wall thickness to above 1.5 mm, or alternatively select a process without sandblasting.

• Risk of Small Part Loss: For small parts (length < 5 mm, weight < 1 g, or lightweight/thin structures), the clamping contact area is limited. During bead blasting and anodizing, high-pressure blasting and stirring of the anodizing bath may cause parts to loosen or fall off, resulting in a relatively high risk of part loss. Therefore, bead blasting and anodizing are not recommended for very small parts.

• Threaded Hole Treatment: Bead blasting media may become trapped in fine threads, potentially affecting the usability of threaded holes smaller than M5. To prevent this, protective rubber plugs will be used, and threaded holes below M5 will not undergo anodizing treatment. Please be aware of this process arrangement; if special anodizing requirements are needed, please inform us in advance.

Anodizing Process

• Differences in Machining Finishes: Parts with the same raw materials but different machining finishes (e.g., wire-cut surface, milled surface, polished surface) can result in color variations after anodizing.

• Differences in Hanging Positions: Parts hung at different heights in the same anodizing tank may exhibit slight color differences after surface treatment.

• Batch Differences: Comparatively obvious color variations may occur after anodizing for parts from different order batches or different orders in the same batches.