Hollow Body Fiber Winding With Roller Compression for Void Removal
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Solution Overview
Problem
The entrainment of air during fiber winding around an object creates voids in the fiber layer, leading to a decrease in strength after curing.
Innovation Solution
A method involving impregnating fibers with resin, winding them on a mandrel, and applying a load using rollers to compress the fiber layer, expelling air from voids and stabilizing the strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fibers are wound around the mandrel surface, then the fiber layer is formed efficiently, but air is entrained creating voids that decrease strength
Solution Approach 1:
A loading roller is introduced to apply a load to the fiber layer in advance before curing, compressing the layer and expelling air that would otherwise form voids. This preliminary compression action prevents the formation of strength-reducing voids while maintaining efficient fiber winding production.
2Loss of time
If fibers are wound around the mandrel surface, then the fiber layer is formed quickly, but voids with air are created reducing strength
Solution Approach 1:
The loading roller applies compression to the fiber layer during the winding process itself, rather than requiring separate post-processing steps. This preliminary action removes air voids in real-time during production, maintaining both speed and strength.
Solution Approach 2:
The natural tendency of air to become trapped during fast winding is converted into a controlled process by using the loading roller to deliberately expel air through applied load. The harmful air entrapment is transformed into a manageable condition where air is systematically removed during the winding operation.
3Strength
If a load is applied to compress the fiber layer, then air is expelled and strength improves, but additional equipment is required
Solution Approach 1:
The loading roller is designed to perform multiple functions: it applies compressive load to expel air, supports the fiber layer during winding, and can be integrated into the existing mandrel winding system. This multi-functionality reduces the need for separate dedicated equipment for each function.
Solution Approach 2:
The loading roller function is merged with the existing winding apparatus, combining the compression function with the fiber layer formation process. Instead of separate equipment for winding and compression, the system integrates both functions into a unified process.
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 improves and stabilizes the strength of the fiber layer by removing voids and excess resin, resulting in a more robust fiber layer after curing.
Implementation Method 1
applying a load to a fiber layer formed on the surface of the mandrel by the winding by pressing a roller against the fiber layer
Data Source
AI summary
A method of manufacturing a hollow body using a mandrel includes an impregnation step of impregnating a fiber with a resin, a winding step of winding the fiber impregnated with the resin around a surface of the mandrel, and a loading step of applying a load to a fiber layer formed on a surface of the mandrel by the winding step by pressing a roller.