Closed-Die Tooling Motion for C/C Preform Carbonization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for manufacturing carbon/carbon (C/C) composites are limited to simple flat structures, which result in low interlaminar properties, and there is a need to maintain compressive forces during heat treatment to prevent wrinkling and dimpling of complex-shaped parts.
Innovation Solution
A heat treatment tooling fixture arrangement is used, comprising a female die with alignment surfaces and a male die guided by alignment rods, allowing controlled movement along multiple axes to maintain compressive forces during carbonization, preventing wrinkling and dimpling of complex-shaped C/C parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional flat structure manufacturing methods are used, then the process is simple, but the interlaminar properties are low
Solution Approach 1:
The die assembly is segmented into multiple functional components: a female die with alignment surfaces, a male die with alignment rods, and intermediate positioning elements. This segmentation allows each component to perform its specific function independently while working together to achieve complex shaping and maintain compressive forces during heat treatment.
Solution Approach 2:
Alignment rods and alignment surfaces act as intermediary elements between the male and female dies. These intermediaries ensure precise positioning and controlled movement of the male die relative to the female die, enabling complex geometry formation while maintaining the necessary compressive forces during the carbonization process.
2Reliability
If compressive forces are not maintained during heat treatment, then the tooling structure is simpler, but wrinkling and dimpling occur on complex-shaped parts
Solution Approach 1:
The male die is designed to be movable rather than fixed, allowing it to dynamically adjust its position during the heat treatment process. The alignment rods enable the male die to move in controlled manner while maintaining contact with the fibrous preform, ensuring continuous application of compressive forces that prevent wrinkling and dimpling throughout the carbonization process.
Solution Approach 2:
The system changes the mechanical parameters of the tooling arrangement during heat treatment by allowing controlled movement of the male die along the alignment rods. This dynamic adjustment maintains optimal compressive forces on the preform throughout the thermal process, preventing surface defects while managing the complexity of the tooling structure.
3Manufacturing precision
If alignment rods and alignment surfaces are added to control male die movement, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The alignment rods serve multiple functions: they guide the movement of the male die, maintain positioning precision, and facilitate controlled movement along multiple axes. Similarly, the alignment surfaces on the female die provide both positioning reference and movement guidance. This multi-functionality reduces the need for additional separate positioning mechanisms.
Solution Approach 2:
The alignment rods and alignment surfaces create a self-aligning system where the male die automatically positions itself relative to the female die through the interaction between the rods and surfaces. The system uses its own structural features to achieve precise positioning without requiring external adjustment mechanisms or complex control systems.
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
The system effectively maintains compressive forces during carbonization, ensuring high interlaminar properties and preventing unwanted impressions on complex-shaped C/C parts, enhancing their structural integrity.
Implementation Method 1
The first alignment rod is positioned to contact the first alignment surface and the second alignment rod is positioned to contact the second alignment surface, wherein the first alignment rod and the second alignment rod are configured to move along the first alignment surface and the second alignment surface, respectively
Implementation Method 2
performing a heat treatment process on the fibrous preform while the fibrous preform is positioned between the male die and the female die
Implementation Method 3
the heat treatment process is a carbonization process
Implementation Method 4
maintain compressive forces during heat treatment to prevent wrinkling and dimpling of complex-shaped parts
Data Source
AI summary
A heat treatment tooling fixture arrangement includes a male die and a female die. The female die includes a plurality of alignment surfaces and the male die includes a plurality of alignment rods configured to ride along the alignment surfaces to control motion of the male die with respect to the female die along two orthogonal directions (e.g., longitudinally and vertically). As an OPF preform shrinks during heat treatment (e.g., carbonization), the male die can move along a first axis toward the female die and can simultaneously move along a second axis along the female die to maintain compressive forces on the OPF preform.