Hand-Rolled Small-Diameter Composite Tube Formation
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Solution Overview
Problem
Existing methods for forming composite tubes, such as filament winding and extrusion, require significant capital investment and are inefficient for producing small quantities or modifying tube designs, especially for small diameters, as they demand costly and time-consuming adjustments to equipment.
Innovation Solution
A method involving hand-forming small-diameter composite tubes by placing a composite sheet on a slip sheet, using a mandrel, and applying force to wind the sheet into a tube, allowing for rapid adaptation to design changes without extensive tooling costs, using a compression bar and vacuum bagging for compaction and curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If filament winding or extrusion methods are used to form composite tubes, then manufacturing precision and structural integrity are improved, but capital investment and equipment cost increase significantly
Solution Approach 1:
The patent employs disposable mandrels and slip sheets that are used once and discarded, eliminating the need for expensive, reusable tooling and equipment. This allows precise tube formation without the capital investment required for permanent fixtures and machinery.
Solution Approach 2:
The invention extracts the essential forming function from complex automated equipment and concentrates it into simple manual operations using basic tools. The core tube-forming action is separated from the expensive equipment that normally provides it.
2Manufacturing precision
If filament winding equipment is used, then composite tube quality is improved, but adaptability to design changes deteriorates due to costly and time-consuming equipment adjustments
Solution Approach 1:
The manual forming process allows dynamic adaptation to design changes without fixed equipment constraints. Operators can immediately adjust to new tube dimensions, wall thicknesses, or geometries by simply changing the mandrel and composite sheet, enabling rapid design iteration.
Solution Approach 2:
The invention enables easy parameter changes by swapping mandrels of different sizes and shapes, and using composite sheets with varying properties. This allows quick adaptation to different tube specifications without reconfiguring equipment.
3Productivity
If traditional extrusion or filament winding methods are used, then production efficiency is improved for large quantities, but productivity for small quantities deteriorates due to setup time and tooling costs
Solution Approach 1:
The process segments the tube formation into simple, discrete manual steps that can be performed quickly without extensive setup. Each tube can be formed independently using basic materials, enabling efficient small-batch production.
Solution Approach 2:
Composite sheets are pre-cut to required sizes and mandrels are prepared in advance, eliminating setup time during production. This preliminary preparation allows immediate formation of tubes when needed, optimizing responsiveness for small quantities.
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
Enables the cost-effective and flexible production of small-diameter composite tubes tailored to specific design requirements, reducing capital investment and allowing for rapid modification of designs, while maintaining high precision and quality.
Implementation Method 1
the composite sheet may wind around the mandrel, forming the composite tube
Data Source
AI summary
A small-diameter composite tube may be formed by hand rolling. A slip sheet may be placed on a work surface, and then a composite sheet may be placed on the slip sheet. A mandrel may be placed at a first edge of the composite sheet, and a portion of the slip sheet may be folded over the mandrel, and the first edge of the composite sheet, such that the mandrel is enclosed in the slip sheet. A compression bar may then be placed on the folded-over portion of the slip sheet and force may be applied, causing the slip sheet to contact the mandrel. Then, the folded-over portion of the slip sheet may be pulled away from the mandrel while force is maintained on the compression bar. As the folded-over portion of the slip sheet is pulled, the composite sheet may wind around the mandrel, forming the composite tube.