Chiral Composite Part Molding With a Single Preform Fixture
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Solution Overview
Problem
The use of preform charges in compression-molding processes for chiral parts requires two separate fixtures, increasing design and tooling costs, especially for parts like fiber-composite footbeds that need to be produced in multiple sizes.
Innovation Solution
A single preform-charge fixture is used to create flat-planar preform charges that can be rotated 180 degrees to produce both a chiral part and its mirror image, eliminating the need for separate fixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a preform charge is used as a feed structure for compression-molding chiral parts, then manufacturing precision and fiber alignment are improved, but device complexity and tooling costs increase due to requiring separate fixtures for each chiral configuration
Solution Approach 1:
The patent applies universality by designing a single preform charge fixture that can produce preform charges for both chiral and mirror-image chiral parts. The fixture is configured with a cavity and cleats that can accommodate preforms arranged in different orientations, allowing one fixture to replace what would traditionally require two separate fixtures, thereby reducing tooling costs while maintaining precise fiber alignment for both part types
Solution Approach 2:
The patent addresses asymmetry by designing the fixture cavity and cleat arrangement to inherently accommodate the asymmetric nature of chiral parts. The fixture structure includes specific geometric features that allow preforms to be positioned for both left-handed and right-handed chiral configurations through a single tooling system, resolving the contradiction between maintaining manufacturing precision for asymmetric parts and reducing the number of fixtures required
2Manufacturing precision
If separate fixtures are used for each chiral part configuration, then manufacturing precision is maintained, but productivity decreases due to increased tooling requirements and setup complexity
Solution Approach 1:
The fixture design enables a single tooling system to produce both chiral and mirror-image parts, effectively doubling the productivity of the tooling investment. The universal fixture eliminates the need to manufacture, store, and maintain separate fixtures for each chiral configuration, reducing setup time and tooling costs while maintaining the geometric precision required for both part types through its specially designed cavity and cleat arrangement
3Manufacturing precision
If preform charges are created in a special fixture with clamps and cleats, then fiber alignment and part geometry are improved, but ease of manufacture deteriorates due to the complexity of fixture design and fabrication
Solution Approach 1:
The patent reduces ease of manufacture difficulties by creating a universal fixture design that consolidates what would otherwise require multiple specialized fixtures. The single fixture incorporates a cavity and cleat system that can accommodate both chiral and mirror-image part geometries, reducing the overall number of fabrication operations required and simplifying the manufacturing workflow while maintaining precise preform arrangement capabilities
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 manufacturing costs and tooling requirements by enabling the production of chiral parts and their mirror images using a single fixture, improving manufacturing efficiency.
Implementation Method 1
The term 'tacking' references heating to the point of softening (but not melting) to effectively join the preforms
Implementation Method 2
the applied pressure is typically low (less than 100 psig and in some cases nothing more than the force of 'gravity' acting on the preforms)
Data Source
AI summary
A method that enables the use of a single preform-charge fixture to create preform charges suitable for creating a chiral part and its mirror image is disclosed. The method utilizes a preform charge having a flat-planar form, unlike the near net shape preform charges used in applicant's legacy methods. Two identical instances of a preform charge are fabricated from the preform-charge fixture. The first instance of the preform charge is placed, in a first orientation, in a first compression mold for fabricating a first part. The second instance of the preform charge is placed, in a second orientation, in a second compression mold for fabricating the second part. The second orientation is obtained by rotating the second instance of the flat planar preform charge 180 degrees relative to the first orientation about an axis that is parallel to a reflection axis of the first and second instance of the preform charge.