Qualification and repair station
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Solution Overview
Problem
Defects such as broken or loose filaments and non-uniform coatings in multi-filament SiC tow can cause perturbations in the coating process, leading to non-uniform coating thickness, filament breakage, and tow rupture, which are not effectively addressed by conventional methods.
Innovation Solution
An apparatus and method for inspecting and repairing multi-filament tow, including a spool system with tensioners, a de-sizing chamber for removing coatings, an inspection chamber for defect detection, and a repair chamber for fixing defects, allowing for pre-processing qualification and repair of individual filaments before coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional coating processes are used on multi-filament tow, then coating can be applied to the fibers, but defects such as broken or loose filaments and non-uniform coatings cause perturbations leading to non-uniform coating thickness and filament breakage
Solution Approach 1:
The system performs preliminary inspection and repair of filament defects before the coating process. The inspection chamber detects broken or loose filaments, and the repair chamber repairs them using a repair coating applied via spray nozzle, preventing these defects from causing perturbations during subsequent coating operations.
Solution Approach 2:
The system uses optical sensors to detect filament defects in real-time during the tow processing. When defects are detected, the system activates the repair mechanism to apply repair coating to the affected areas, creating a feedback loop that maintains filament integrity and coating uniformity.
2Productivity
If broken or loose filaments are present in the multi-filament tow, then the tow can be processed, but these defects create fuzz in the tow transport system causing further filament breakage and tow rupture
Solution Approach 1:
The system performs preliminary repair of filament defects in the repair chamber before the tow enters the coating and transport systems. Broken filaments are repaired with repair coating that bonds them to adjacent filaments, preventing fuzz formation and subsequent breakage during transport and processing.
Solution Approach 2:
The system applies repair coating to filament defects in advance to prevent the harmful effects of broken filaments. This preliminary anti-action stops the chain reaction of fuzz creation, filament breakage, and tow rupture that would otherwise occur during normal processing.
3Ease of manufacture
If non-uniform PVA coating is present on the multi-filament SiC tow, then the tow can proceed to coating, but this causes perturbations in the coating process
Solution Approach 1:
The system performs preliminary inspection of the PVA coating uniformity in the inspection chamber before the main coating process. Areas with non-uniform coating or filament defects are identified and repaired in advance, ensuring uniform coating application during the subsequent coating operation.
Solution Approach 2:
Optical sensors monitor the PVA coating uniformity and filament condition in real-time. When non-uniformities are detected, the system activates the repair mechanism to apply additional coating or repair filaments, creating feedback control that maintains coating uniformity throughout the process.
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 improves the quality and reliability of the tow material by ensuring uniform coating and reducing filament breakage, resulting in increased uptime, throughput, and yield during the chemical vapor infiltration process.
Implementation Method 1
a de-sizing chamber comprising a heater to heat the multi-filament tow to a first temperature suitable for removing a coating on the multi-filament tow
Implementation Method 2
an inspection chamber configured to inspect the multi-filament tow for defects
Implementation Method 3
a repair chamber configured to repair the defects in the multi-filament tow
Data Source
Figure 1
Figure 2
AI summary
Apparatus for qualification and repair of multi-filament tow are provided herein. In some embodiments, an apparatus for inspecting and repairing a multi-filament tow includes a first spool having a multi-filament tow wound on the first spool; a first tow tensioner following the first spool to impart a predetermined tension on the multi-filament tow; a de-sizing chamber comprising a heater to heat the multi-filament tow to a first temperature suitable for removing a coating on the multi-filament tow; an inspection chamber configured to inspect the multi-filament tow for defects; a repair chamber configured to repair the defects in the multi-filament tow; a second tow tensioner following the repair chamber to impart a predetermined tension on the multi-filament tow; and a second spool following the second tow tensioner to collect the multi-filament tow.