Molded Casing with Mosaic Surface and Sharp Edges
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Solution Overview
Problem
Conventional methods for manufacturing molded casings with polygonal mosaic surfaces struggle to create sharp edges, resulting in rounded corners and failure to meet appearance requirements due to limitations in manufacturing apparatus precision and cutting tool trimming.
Innovation Solution
A mold assembly composed of mutually-independent composition units with polygonal surfaces that are precisely aligned and tightly connected to form a mosaic tooling surface with sharp intersection lines, allowing for the creation of a molded casing with sharp crest and valley lines by using a mold structure with complementary shapes and heating the material during the molding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cutting tools or electrical discharge machining are used to form the mold surface, then the manufacturing process can be completed, but the resulting mold surface has rounded corners and cannot achieve sharp edges
Solution Approach 1:
The mold is divided into multiple composition units, each forming a portion of the mosaic surface. This segmentation allows each unit to be manufactured independently with standard tools, while the assembly of multiple units creates the overall sharp-edged mosaic pattern. The segmentation principle resolves the contradiction by shifting the precision requirement from individual manufacturing steps to the final assembled structure.
Solution Approach 2:
The invention transitions from forming sharp edges through precise 2D surface machining to creating them through 3D assembly of multiple composition units. Each unit has a thickness dimension that, when assembled with precise positioning, creates the sharp intersection lines visible on the surface. This dimensional approach allows standard manufacturing tools to produce components that achieve sharp edges when assembled.
2Manufacturing precision
If the mold is integrally formed using conventional methods, then manufacturing is simpler, but the appearance quality with rounded corners fails to meet requirements
Solution Approach 1:
The mold structure is segmented into multiple composition units that can be manufactured using conventional methods. Each unit is simpler to manufacture individually, but their assembly creates the complex mosaic pattern with sharp edges. This segmentation resolves the contradiction by trading structural complexity for manufacturing simplicity and appearance quality.
Solution Approach 2:
The mosaic pattern is created by assembling multiple copies of composition units with complementary shapes. Rather than attempting to machine the entire complex mosaic surface as a single integral structure, the invention uses repeated units that copy the basic geometric pattern, achieving high appearance quality through replication rather than direct machining.
3Manufacturing precision
If cutting tools are used to trim the mold surface, then material can be removed to form the pattern, but precision limits prevent achieving sharp corners
Solution Approach 1:
The mold surface is segmented into multiple composition units, each with simpler geometry that can be trimmed with conventional tools. The sharp corners emerge from the interfaces between units rather than from trimming individual surfaces, thereby overcoming the precision limits of cutting tools through geometric assembly.
Solution Approach 2:
Instead of using cutting tools to directly create sharp corners on the mold surface, the invention inverts the approach by assembling pre-manufactured composition units whose interfaces naturally form the sharp corners. The sharp features are created by the arrangement of components rather than by subtractive machining, reversing the conventional methodology.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables the production of molded casings with sharp intersection lines and a uniform thickness, meeting both molding and appearance requirements, and providing a special visual effect suitable for handheld electronic devices and other products.
Implementation Method 1
a heating device is further provided for heating the elastic material
Data Source
AI summary
A molded casing suitable for a handheld electronic device is provided. The handheld electronic device includes a body and the molded casing, and at least one part of the body is covered with the molded casing. The molded casing is in a uniform thickness and has a continuous mosaic surface. The mosaic surface is composed of a plurality of non-coplanar polygons, wherein an intersection line is formed between any two adjacent polygons. An end of any one of the intersection lines is connected to an end of another intersection line or an edge of the mosaic surface.