Autoclave Induction Heating for Composite Preforms
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Solution Overview
Problem
Large-scale autoclaves used for processing composite materials are energy-intensive, costly, and hinder efficient manufacturing due to their large thermal mass, high energy requirements, and inefficient processing times, which complicates assembly line operations and increases utility costs.
Innovation Solution
The design of autoclaves with inner surfaces that match the contours of specific preforms, allowing for reduced volume and mass heating, combined with the use of layup mandrels and heaters to efficiently apply heat and pressure, enabling faster processing and reduced gas usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If large scale autoclaves are used to accommodate a wide range of component geometries, then versatility is improved, but energy consumption increases due to large thermal mass and volume
Solution Approach 1:
The autoclave system is segmented into multiple smaller autoclaves, each designed for specific component types, rather than using one large autoclave for all components. This segmentation reduces the thermal mass of each unit while maintaining overall system versatility through multiple specialized units.
Solution Approach 2:
The patent employs movable autoclaves on wheeled carriages that can be transported between processing positions and storage areas. This dynamic arrangement allows flexible allocation of autoclave resources to match production demands for different component geometries, improving versatility without requiring a permanently installed large-scale system.
2Productivity
If large scale autoclaves are used to process multiple components, then productivity is improved, but cycle time increases due to heating and cooling requirements
Solution Approach 1:
Multiple smaller autoclaves are used in parallel instead of one large autoclave. Each smaller autoclave has reduced thermal mass, enabling faster heating and cooling cycles. The segmented approach maintains overall productivity by distributing work across multiple units with shorter cycle times.
Solution Approach 2:
The patent replaces traditional gas-based heating systems with induction heating technology. Induction heating provides faster, more efficient, and more precise temperature control, significantly reducing the heating time portion of the cycle time while maintaining the required processing temperature.
3Temperature
If traditional gas heating is used in autoclaves, then heating capability is achieved, but energy efficiency deteriorates due to significant gas consumption
Solution Approach 1:
The patent substitutes induction heating technology for traditional gas heating systems. Induction heating directly heats the autoclave chamber and components through electromagnetic fields, eliminating the need for large volumes of heated gas. This substitution maintains effective heating capability while dramatically reducing energy consumption and gas usage.
4Ease of manufacture
If centralized autoclave processing is used, then equipment cost is reduced, but manufacturing efficiency deteriorates due to transportation requirements
Solution Approach 1:
The patent implements movable autoclaves on wheeled carriages that can be transported along assembly lines and positioned at various processing stations. This dynamic deployment allows autoclaves to be integrated directly into continuous manufacturing flows, eliminating transportation bottlenecks while maintaining cost-effective equipment sizing through modular units.
Solution Approach 2:
Multiple autoclaves are arranged in nested or serial configurations along the assembly line, with smaller autoclaves positioned within or adjacent to larger processing areas. This nesting optimizes space utilization and allows components to progress through multiple processing stages in a continuous flow, improving manufacturing efficiency without requiring excessive equipment investment.
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 approach reduces cycle time, increases efficiency, and minimizes energy consumption, allowing for continuous processing and optimized factory operations by enabling faster heating and cooling of components.
Implementation Method 1
the thermal cycle time for curing a thermoset composite part in an autoclave is reduced by placing a heating blanket in proximity to an area of the composite part that is slow-to-heat, and inductively heating the area of the composite part that is slow-to-heat using the heating blanket
Data Source
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AI summary
The application relates to an apparatus and method (1000) in relation to an in-line autoclave (180) adapted to perform geometry. The method includes driving a layup mandrel (120) in a process direction (179) into an autoclave (180); and heating (1004) a preform (170) at the layup mandrel via heaters (122) disposed in the layup mandrel and via heaters (182) disposed in the autoclave (180), wherein driving (1002) the layup mandrel (120) into the autoclave (180) forms a pressure chamber (187) between the layup mandrel (120) and the autoclave (180).