Electronic Case Hole Structure to Prevent Burr-Induced Film Tearing
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Solution Overview
Problem
The existing methods for shaping patterns on metal products, such as portable electronic devices, often result in burr formation during hole processing, which can lead to anodizing film tearing, surface corrosion, and reduced durability.
Innovation Solution
A case design featuring a base plate with a hole, a pattern of crests and troughs on one surface, an inclined area between the hole and pattern, and at least one step, where the first angle of the inclined area with the central axis is greater than the angle of view through the hole, alternately arranged with varying radii of curvature, to prevent burr formation and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hole processing is performed on a product with a pattern, then the product structure is completed, but burr generation occurs and the anodizing film is torn
Solution Approach 1:
The inclined area is formed in advance before hole processing to prevent burr generation. By creating the inclined surface that guides burrs away from the anodizing film during the subsequent hole formation process, the patent prevents film tearing before it can occur.
Solution Approach 2:
The inclined area acts as an intermediary structure between the hole and the patterned surface. It mediates the interaction during hole processing by redirecting burrs away from the anodizing film, preventing direct contact and film damage.
2Ease of manufacture
If the anodizing film is torn by burrs, then hole processing is completed, but the surface becomes vulnerable to corrosion
Solution Approach 1:
The patent converts the potentially harmful burrs into beneficial elements by using the inclined area to guide them away from the anodizing film. The burrs that would normally cause damage are redirected to safely exit through the inclined surface, protecting the film while still allowing hole formation.
3Shape
If a pattern is formed close to the hole, then the design is optimized, but burr generation increases and film tearing occurs
Solution Approach 1:
The inclined area creates a local quality change in the region between the hole and the pattern. By modifying the surface geometry locally with an inclined surface, the patent enables the pattern to be positioned closer to the hole while preventing burr-induced damage through the localized structural modification.
4Productivity
If fine burrs remain after anodizing, then hole processing is completed, but the surface glittering increases
Solution Approach 1:
The inclined area facilitates the extraction of burrs from the processing zone by providing a designated exit path. Burrs are guided along the inclined surface and removed from the vicinity of the anodized surface, preventing them from remaining as glittering defects on the final product.
Data Source
AI summary
A case includes a base plate, a hole formed through the base plate, a pattern that is on one surface of the base plate and includes a plurality of crests and a plurality of troughs. The case further includes an inclined area that is between the hole and the pattern, and at least one step that is between the inclined area and the hole, in which a first angle that the inclined area forms with a central axis of the hole is greater than a second angle that is an angle of view through the hole.