Stiffener Loading Tool for Composite Assembly
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Solution Overview
Problem
The labor and time-intensive process of assembling stiffened composite structures, particularly in aerospace applications, where the bagging and vacuum compaction of stringers is a bottleneck in manufacturing efficiency.
Innovation Solution
A system and method involving a stiffener loading tool and a stiffener transporting tool, which allows for sequential and efficient loading of stiffeners onto an inner mold line layup mandrel, followed by the application of skin segments, without the need for traditional bagging and vacuum compaction, utilizing a combination of tools to streamline the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional bagging and vacuum compaction methods are used to assemble stiffeners, then structural integrity is maintained, but labor time and manufacturing complexity increase significantly
Solution Approach 1:
The stiffeners are pre-assembled onto the mandrel in their final positions before the skin is applied. This preliminary positioning eliminates the need for time-consuming batch compaction operations during the main assembly process, as the stiffeners are already in place and do not require subsequent handling or compression operations.
Solution Approach 2:
The patent extracts the stiffener positioning function from the traditional bagging process. Instead of incorporating stiffeners into batch vacuum compaction operations, the method separates stiffener placement as a distinct preliminary step, allowing them to be individually positioned and secured before skin application, thereby eliminating the labor-intensive batch compaction step.
2Reliability
If traditional bagging and batch vacuum compaction are used, then stiffeners are properly secured, but device complexity and labor requirements increase
Solution Approach 1:
The patent removes the complex bagging and vacuum compaction equipment from the assembly process. By extracting the stiffener securing function to a simpler preliminary positioning step, the method eliminates the need for gas-impermeable flexible sheets, vacuum pumps, and complex sealing operations, thereby reducing device complexity while maintaining stiffener security.
Solution Approach 2:
The stiffeners are positioned and secured using straightforward mechanical means that do not require complex external equipment. The method enables the assembly process to serve itself through simple, direct positioning techniques rather than relying on elaborate vacuum compaction systems, reducing both equipment and operational complexity.
3Manufacturing precision
If manual hand-alignment and batch compaction are used for stringers, then positioning accuracy is achieved, but productivity decreases
Solution Approach 1:
Stiffeners are positioned and secured in advance before the skin is applied. This preliminary positioning allows for careful placement and alignment without the time pressure of batch operations, maintaining positioning accuracy while enabling continuous workflow that improves overall productivity by eliminating subsequent compaction steps.
Solution Approach 2:
The method enables continuous assembly operations by eliminating the interruptive batch compaction process. Stiffeners are positioned sequentially and permanently secured, allowing the assembly line to proceed without stopping for compression cycles, thereby maintaining precision through deliberate placement while continuously improving productivity through uninterrupted workflow.
Data Source
AI summary
Methods of assembling a stiffened composite structure include loading, with a stiffener loading tool, a respective stiffener from a supply of stiffeners onto an inner mold line layup mandrel; repeating the loading to load a plurality of stiffeners onto the inner mold line layup mandrel; and following the repeating, affixing a respective skin segment from a supply of skin segments to the plurality of stiffeners loaded on the inner mold line layup mandrel to form at least a portion of the stiffened composite structure. Systems for assembling stiffened composite structures include a supply of stiffeners; an inner mold line layup mandrel; and a stiffener loading tool configured to load the respective stiffener onto the inner mold line layup mandrel.