Two-Layer Watch Band Link Structure for Wear-Resistant Styling
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Solution Overview
Problem
Conventional watch bands composed of single-layer metallic band links lack design flexibility and are not optimal in terms of wear resistance and manufacturing process efficiency.
Innovation Solution
A band link with a two-layer structure, comprising a base layer of a first metallic material (e.g., titanium) and a cover layer of a second metallic material (e.g., COBARION) with different densities and hardnesses, where the base layer forms the inner surface and the cover layer forms the outer surface, enhancing designability and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer metallic structure is used for band links, then the manufacturing process is simple, but the design flexibility and wear resistance are insufficient
Solution Approach 1:
The band link is divided into two separate layers: a base layer and a cover layer. Each layer can be manufactured independently using appropriate processes (base layer by forging/casting, cover layer by precision machining), then joined together. This segmentation allows each layer to be optimized for its specific function while maintaining manufacturing efficiency.
Solution Approach 2:
The invention uses a composite structure combining two different metallic materials with distinct properties. The base layer uses a material optimized for strength and formability, while the cover layer uses a material optimized for wear resistance and aesthetic appearance. This composite approach resolves the contradiction by achieving enhanced design flexibility and wear resistance without significantly complicating the manufacturing process.
2Device complexity
If a single-layer metallic structure is used for band links, then the structure is simple, but the wear resistance is insufficient
Solution Approach 1:
The cover layer is specifically designed with higher wear resistance properties and is positioned only where wear occurs (the outer surface of the band link). This local quality approach enhances wear resistance at critical areas without requiring the entire structure to be made of high-wear-resistance material, thus maintaining structural simplicity while improving reliability.
3Reliability
If different metallic materials with different densities are used in a two-layer structure, then wear resistance and designability improve, but the manufacturing complexity increases
Solution Approach 1:
The base layer is manufactured first using forging or casting processes to establish the fundamental shape and structural integrity. Subsequently, the cover layer is precision-machined to fit over the base layer. This preliminary action sequence allows each layer to be optimized for its manufacturing process, reducing overall complexity despite using different materials.
Solution Approach 2:
The base layer and cover layer are joined together through interference fitting or mechanical fastening, merging two independently manufactured components into a unified band link structure. This merging approach allows each layer to be manufactured using the most appropriate process for its material properties, thereby managing manufacturing complexity while achieving enhanced wear resistance and design flexibility.
4Adaptability or versatility
If a two-layer structure with different metallic materials is used, then design flexibility and wear resistance improve, but the processing freedom may be reduced
Solution Approach 1:
By segmenting the band link into base layer and cover layer, each layer can be processed independently with appropriate methods. The base layer can undergo forming operations while the cover layer receives precision machining, allowing design flexibility without requiring the entire structure to be processed through all operations.
Data Source
AI summary
A band link according to an embodiment of the present disclosure includes: a base layer formed of a first metallic material and the base layer being with a hole portion in which a coupling member is disposed; and a cover layer formed of a second metallic material that is different from the first metallic material, the cover layer being stacked on one side of the base layer, the base layer and the cover layer being formed as one piece.