Carbon Foam Composite Tooling for CTE Matching
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Solution Overview
Problem
Current composite tooling for carbon fiber composites faces challenges in matching the coefficient of thermal expansion (CTE) with the materials used, leading to issues such as part retention, tool damage, and increased costs due to the scarcity of materials with low CTEs like INVAR and graphite, which are heavy, expensive, and difficult to fabricate.
Innovation Solution
The use of tool bodies composed of carbon foam and high-density carbon foam, which are bonded together to create a tool face with a CTE similar to carbon fiber composites, allowing for precise shaping and curing of composite parts while being lightweight and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional low CTE materials like INVAR and graphite are used for tool bodies, then CTE matching with carbon fiber composites is achieved, but weight increases, cost increases, and manufacturing difficulty increases
Solution Approach 1:
The patent uses carbon foam as a composite material that inherently provides low CTE similar to carbon fiber composites, eliminating the need for traditional heavy low-CTE materials like INVAR and graphite. The carbon foam tool body achieves CTE matching while being lightweight and cost-effective.
Solution Approach 2:
The patent changes the material parameter from traditional metals and graphite to carbon foam, which has inherently different thermal expansion properties that match carbon fiber composites. This parameter change resolves the CTE matching problem while improving weight and cost characteristics.
2Reliability
If traditional low CTE materials like INVAR and graphite are used for tool bodies, then CTE matching with carbon fiber composites is achieved, but manufacturing cost increases
Solution Approach 1:
Carbon foam serves as a cost-effective composite material alternative to expensive traditional materials like INVAR and graphite. The carbon foam tool bodies reduce manufacturing cost while maintaining the required low CTE for proper matching with carbon fiber composite parts.
Solution Approach 2:
By changing the material selection from expensive traditional low-CTE materials to carbon foam, the patent achieves the same CTE matching function at lower cost, resolving the technical contradiction between reliability and ease of manufacture.
3Reliability
If traditional low CTE materials like INVAR and graphite are used for tool bodies, then CTE matching with carbon fiber composites is achieved, but manufacturing complexity increases
Solution Approach 1:
Carbon foam provides inherent low CTE properties that match carbon fiber composites, simplifying the tool body design and fabrication process. Unlike traditional materials that require complex fabrication procedures, carbon foam tool bodies are easier to manufacture with reduced complexity.
Solution Approach 2:
The patent changes the material parameter to carbon foam, which naturally provides the required low CTE without requiring complex fabrication processes, thereby resolving the contradiction between reliability and device complexity.
4Ease of manufacture
If carbon foam and high density carbon foam are used for tool bodies, then tooling cost decreases and weight decreases, but CTE matching with composite parts must be maintained
Solution Approach 1:
Carbon foam and high density carbon foam are composite materials that inherently provide low CTE similar to carbon fiber composites. This intrinsic property ensures CTE matching is achieved automatically, resolving the technical contradiction between ease of manufacture and reliability.
5Weight of stationary object
If carbon foam and high density carbon foam are used for tool bodies, then tool weight decreases, but structural strength must be maintained
Solution Approach 1:
The patent uses a composite structure combining carbon foam and high density carbon foam, where each material contributes different properties. The high density carbon foam provides enhanced strength and rigidity in critical areas, while the carbon foam provides lightweight characteristics, achieving local optimization of both weight and strength.
Solution Approach 2:
By combining carbon foam with high density carbon foam, the patent creates a composite tool body that leverages the strengths of both materials. The high density carbon foam reinforces the structure to maintain required strength while the overall foam-based construction keeps weight low, resolving the technical contradiction between weight and strength.
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 solution enables the production of composite parts with precise dimensional accuracy and reduced tooling costs by matching the CTE of the tool face with the composite parts, while also providing a lightweight and durable tooling system that is easier to manufacture and maintain.
Implementation Method 1
carbon foam and high density carbon foam, which are bonded together to create a tool face
Data Source
AI summary
Tools for the forming of composite parts from composite forming materials, having tool bodies that comprise, at least in part, carbon foam and high density carbon foam are described. In some embodiments, a surface of the carbon foam or high density carbon foam may comprise a tool face. In other embodiments, the carbon foam or high density carbon foam may support an other material, referred to as tool face material, wherein a surface of the tool face material may comprise a tool face. The tools of the present invention may be lighter, more durable, and less costly to produce and/or use than conventional tools used for the production of composite parts, particularly those tools used for the production of carbon composites. Additionally, such tools may be reusable, repairable, and more readily modifiable.