Fishing Rod Concave Outer Convex Inner Surface Manufacturing
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Solution Overview
Problem
Existing methods for manufacturing fishing rods cannot produce a shape with a concave outer surface and a convex inner surface, limiting the ability to create complex shapes such as those with recessed areas on the outer surface and protrusions on the inner surface.
Innovation Solution
A fishing rod is manufactured using a prepreg sheet wound around a core with a silicone tube that has a boss corresponding to the desired convex inner surface, and a tightening tape is applied to create a concave outer surface and a convex inner surface through heat-curing, allowing for the formation of complex shapes with radial and axial recesses and protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a prepreg sheet is wound around a core and heat-cured to form a fishing rod, then the fishing rod can have a bulged section following the core shape, but it is not possible to form a fishing rod with a concave shape
Solution Approach 1:
A silicone rubber tube with a boss (protrusion) on its inner surface is introduced as an intermediary between the core and the prepreg sheet. The boss on the silicone tube creates the concave shape on the outer surface of the fishing rod after heat-curing, while the silicone tube itself acts as a removable mold that enables complex shape formation without requiring the core to have the exact final shape
Solution Approach 2:
The silicone rubber tube with the pre-formed boss structure is placed on the core before winding the prepreg sheet. This preliminary placement of the shaping element allows the concave shape to be formed during the heat-curing process itself, rather than requiring subsequent machining or forming operations
2Shape
If a recess is provided on the outer surface of a fishing rod, then aesthetics and gripping force are improved, but it is not possible to provide a convex inner surface that protrudes into the inner circumference
Solution Approach 1:
The boss (protrusion) on the inner surface of the silicone rubber tube serves as an intermediary that simultaneously creates both the concave outer surface and the convex inner surface. When the prepreg sheet is wound around the silicone tube and heat-cured, the boss impresses its shape into the material, forming the convex inner surface that corresponds to the concave outer recess
Solution Approach 2:
The formation of the concave outer surface and convex inner surface is merged into a single shaping operation using the silicone tube with the boss. Both structural features are created simultaneously during the heat-curing process, rather than requiring separate manufacturing steps for the outer and inner surfaces
3Shape
If a binding tape is spirally bound to follow the shape of the core, then a bulged section can be formed, but the process becomes complex and cannot achieve concave shapes
Solution Approach 1:
The silicone rubber tube replaces the complex binding tape system as the shaping intermediary. Instead of requiring spirally bound tape to follow complex core contours, the silicone tube with its pre-formed boss structure directly provides the desired shape, simplifying the manufacturing process while enabling concave shapes that were previously impossible
Solution Approach 2:
The boss on the silicone tube serves as a negative mold that copies its protruding shape into the prepreg sheet during heat-curing. This copying process automatically creates the corresponding convex inner surface and concave outer surface without requiring complex manual shaping or binding operations
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 method enables the creation of fishing rods with enhanced gripping force due to the concave-convex design, improved aesthetics through smooth and spiral uneven surfaces, and simplifies the manufacturing process by eliminating the need for additional polishing steps.
Implementation Method 1
heat-cured by heating and baking
Data Source
AI summary
A fishing rod is disclosed. The fishing rod includes a rod body. The rod body has a first cylindrical part. The first cylindrical part has a lower portion formed by a concave outer surface that is recessed and a convex inner surface that protrudes convexly along the concave outer surface.