Induction Heating Smart Susceptors Composite Curing
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Solution Overview
Problem
Current methods for out-of-autoclave curing of composite parts face challenges in achieving uniform and precise temperature control, especially for larger parts, often requiring complex and expensive tooling, which is not suitable for prototype or short-run production.
Innovation Solution
The use of a method and apparatus incorporating inductive heating circuits with smart susceptors, where multiple inductive heating coils are coupled in parallel and series with an AC power supply, allowing for simple and cost-effective tooling that provides uniform temperature control across large composite parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional oven or autoclave methods are used for curing composite parts, then uniform temperature control is achieved, but the equipment complexity and cost increase significantly
Solution Approach 1:
The curing system is segmented into multiple independent induction heating coils distributed across the tooling surface. Each coil can be independently controlled to heat specific zones, replacing the need for a single complex autoclave or oven system while achieving uniform temperature distribution through coordinated operation of multiple simpler units.
Solution Approach 2:
The patent replaces traditional mechanical heating systems (ovens and autoclaves that rely on conduction and convection) with electromagnetic induction heating. The induction heating system uses magnetic fields to directly generate heat in the composite parts and tooling, eliminating the need for complex mechanical heating chambers and enabling more precise, uniform temperature control.
2Temperature
If complex tooling is used to achieve uniform heating, then temperature distribution improves, but manufacturing cost increases
Solution Approach 1:
The tooling incorporates multiple discrete induction heating coils that can be independently positioned and controlled. This segmentation allows for flexible heating zones that can be tailored to the specific part geometry without requiring complex integrated tooling designs, reducing overall manufacturing cost while maintaining uniform temperature distribution.
Solution Approach 2:
The induction heating system provides dynamic control over heating zones through independent coil operation. The system can adapt heating patterns to different part sizes and geometries by activating different coil combinations, eliminating the need for expensive custom tooling for each application while ensuring uniform temperature distribution.
3Measurement precision
If induction heating with smart susceptors is used, then temperature precision improves, but the complexity of the heating system increases
Solution Approach 1:
The system incorporates temperature sensors and control electronics that provide feedback to the induction heating coils. This feedback mechanism enables precise temperature control by automatically adjusting coil power output based on measured temperatures, achieving accurate temperature management while keeping the control system modular and manageable.
Solution Approach 2:
The patent introduces smart susceptors as intermediary elements between the induction coils and the composite parts. These susceptors with specific magnetic properties enhance the heating efficiency and uniformity by concentrating and distributing the electromagnetic fields, thereby improving temperature precision without requiring direct complex control of each heating zone.
4Area of stationary object
If multiple induction heating coils are used for large parts, then the size of parts that can be cured increases, but the electrical circuit complexity increases
Solution Approach 1:
The electrical system is segmented into multiple independent coil circuits that can be controlled separately. Each coil or coil group has its own power supply and control circuitry, allowing large parts to be heated by activating only the necessary coils for the specific area being cured, thereby managing electrical complexity through modular architecture.
Solution Approach 2:
The system enables selective activation of induction coils based on the part size and heating requirements. Rather than requiring all coils to be active simultaneously, the control system can apply partial heating to specific zones, reducing the total electrical load and simplifying circuit management while still capable of handling large parts when needed.
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 enables precise and uniform temperature control during the curing process, facilitating the curing of large composite parts without the need for ovens or autoclaves, while maintaining cost-effectiveness and simplicity in tooling design.
Implementation Method 1
induction heating circuits with smart susceptors
Implementation Method 2
heating blankets using inductively heated smart susceptors
Implementation Method 3
Each of the inductive coil circuits includes a smart susceptor having a preselected Curie temperature
Data Source
AI summary
A composite part is cured out-of-autoclave using an inductively heated, stand-alone tooling. The part in placed on a tool and is covered by a heating blanket. One side of the part is heated by inductive coil circuits in the tool, and the other side of the part is heated by inductive coil circuits in the blanket.