Fiber Bobbin Unwinding With Sensor-Guided Tension Alignment
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Solution Overview
Problem
Current methods for manufacturing Ceramic Matrix Composites (CMCs) face challenges in maintaining consistent fiber tension during the unwinding process, leading to breakage and non-uniform coating due to excessive friction and tangling, which affects mechanical properties and processing efficiency.
Innovation Solution
An automated unwinding system utilizing sensors and motor-driven alignment to maintain optimal angles and position the fiber tow, minimizing friction and tangling, and ensuring consistent tension, thereby preventing breakage and ensuring uniform coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filament handling apparatus is used to unwind fiber bundles, then the unwinding process can be performed, but fiber bundles break in midstream due to excessive friction or tangling
Solution Approach 1:
The system dynamically adjusts the angle of the fiber bundle relative to the bobbin axis during unwinding, transitioning from a fixed angle to a variable angle that optimizes friction reduction. The bobbin is movable along the axial direction to maintain the optimal angle range, making the system adaptive rather than static.
Solution Approach 2:
A sensor positioned between the bobbin and pulley continuously monitors the fiber bundle position and provides feedback to the control system. This feedback loop enables real-time adjustment of the bobbin position to maintain optimal unwinding conditions and prevent breakage.
2Manufacturing precision
If tension control is applied during fiber unwinding, then coating thickness uniformity can be maintained, but fiber breakage occurs when friction exceeds fiber strength
Solution Approach 1:
The system converts the potentially harmful high friction condition into a beneficial controlled tension condition by optimizing the unwinding angle. By maintaining the fiber bundle at an optimal angle to the bobbin axis, the system reduces excessive friction while preserving sufficient tension for uniform coating application.
3Manufacturing precision
If automated sensor-based angle maintenance system is implemented, then fiber quality and coating uniformity improve, but device complexity increases
Solution Approach 1:
The sensor system serves multiple functions: it monitors fiber bundle position, provides feedback for angle control, and enables automated bobbin positioning. This multi-functionality reduces the need for separate control systems and simplifies the overall device architecture despite the added automation capabilities.
Data Source
AI summary
Unwinding systems and methods are provided for unwinding a fiber from a bobbin. The unwinding system can include an axle defining a first axis extending an axial direction, a bobbin rotatably mounted around the axle, a pulley positioned to receive the fiber from the bobbin, wherein the pulley is rotatable around a second axis, and a sensor positioned between the bobbin and the pulley. The bobbin is moveable along the axial direction, and wherein the fiber extends tangentially from a surface of the bobbin.