Filament Winding Tank Liner Temperature Control
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Solution Overview
Problem
During the filament winding process for manufacturing high-pressure tanks, such as hydrogen tanks, the fibers in the inner hoop layers tend to skid and deviate at the end portions adjacent to the dome parts, leading to reduced initial strength and fatigue strength due to the pressure exerted by outer hoop layers, resulting in positional displacement.
Innovation Solution
The manufacturing method involves sequentially laminating hoop layers with the temperature of the end portions adjacent to the dome parts set lower than the remaining portions, increasing the viscosity and tackiness of the resin, thereby reducing fiber positional displacement. This is achieved by using cold air blowers to maintain the end portions at 16° C. or less, while the remaining parts are kept at 20° C. to 25° C., enhancing the adhesiveness and reducing displacement to 2 mm or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fibers are wound in multiple hoop layers from the outer circumference toward the inner circumference, then the reinforcing effect is improved, but the fibers in inner hoop layers are pushed outward causing positional displacement
Solution Approach 1:
The patent applies preliminary anti-action by pre-cooling the end portions of the body part before fiber winding begins. This creates a temperature difference that increases resin viscosity at the end portions, which prevents fiber displacement before it can occur during the winding process. The cooling is performed in advance to counteract the pushing force that will be generated when outer hoop layers are wound over inner hoop layers.
Solution Approach 2:
The patent implements local quality by applying different temperature conditions to different regions of the tank body. The end portions adjacent to dome parts are cooled to lower temperatures (increasing resin viscosity) while the remaining portions are maintained at higher temperatures. This localized temperature control ensures that fiber positional displacement is prevented specifically at the vulnerable end portions without affecting the overall winding process.
2Manufacturing precision
If the temperature of end portions is lowered to increase resin viscosity, then fiber positional displacement is reduced, but the winding process becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the temperature control into distinct zones: end portions adjacent to dome parts are cooled separately from the remaining portions of the body part. This is achieved by positioning cooling devices (such as cold air blowers) specifically at the end portions, creating independent temperature control zones that simplify the overall control strategy while achieving the desired localized viscosity increase.
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
This method effectively reduces fiber positional displacement at the end portions, enhancing the initial strength and fatigue strength of the tank by improving the resin's tackiness and adhesiveness, resulting in improved pressure capacity and quality of the tank.
Implementation Method 1
by setting the temperature of the end portions of the body part adjacent to the dome parts lower than the temperature of the remaining portion of the body part, it is possible to increase viscosity of the resin
Data Source
AI summary
A manufacturing method for a tank is a method of manufacturing the tank by winding fibers impregnated with an epoxy resin in a plurality of layers around an outer circumference of a liner having a body part and dome parts provided at both ends of the body part. The manufacturing method includes sequentially laminating a plurality of hoop layers by hoop-winding the fibers from a side closer to an outer circumference of the body part toward a side farther from the outer circumference of the body part. When laminating the hoop layers, a temperature of end portions of the body part adjacent to the dome parts is set lower than a temperature of a remaining portion of the body part, the remaining portion being a portion of the body part other than the end portions.