Rotor Blade Bond Fixture With Segmented Clamps
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Solution Overview
Problem
The manufacturing and repair of rotor blades for rotary-wing aircraft face challenges in efficiently bonding sheath assemblies due to high stresses and strains from aerodynamic forces, requiring effective application of heat and pressure without damaging the blades.
Innovation Solution
A bond fixture with a heater and clamps that apply localized and constant heat and pressure, using a combination of pivotable members and a root end lift mechanism to securely hold the rotor blade, allowing for even heat distribution and pressure application through a vacuum bag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a bond fixture with heater and clamps is used to apply localized heat and pressure, then bonding efficiency and consistency are improved, but device complexity increases
Solution Approach 1:
The bond fixture is divided into multiple independent clamps (first clamp, second clamp, third clamp, fourth clamp) that can be positioned and adjusted separately along the rotor blade. Each clamp has its own heater and pressure application mechanism, allowing localized bonding operations at different positions without requiring a single complex centralized system.
Solution Approach 2:
The clamps are designed with movable and adjustable components that can be dynamically positioned along the rotor blade length. The first and second clamps can move along the upper and lower surfaces respectively, while the third and fourth clamps can position themselves on opposite sides of the blade, enabling flexible adaptation to different bonding locations and configurations.
2Manufacturing precision
If multiple clamps with pads are used to apply pressure, then bonding consistency is improved, but ease of operation deteriorates
Solution Approach 1:
The pads are designed to automatically conform to the rotor blade surface geometry through their material properties and mounting mechanisms. The first pad conforms to the upper surface while the second pad conforms to the lower surface, reducing the need for manual adjustment and positioning by operators while maintaining consistent pressure distribution across the bonding area.
3Use of energy by moving object
If localized heat application is used instead of walk-in ovens, then energy efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
Each clamp is equipped with its own heater that applies heat locally to the specific bonding position on the rotor blade. This localized heating approach allows precise temperature control at each bonding point independently, eliminating the need for large walk-in ovens while maintaining the thermal conditions required for consistent bonding quality.
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 solution enables efficient bonding of sheath assemblies to rotor blades, ensuring consistent performance and reducing the need for large walk-in ovens, while minimizing damage to the rotor blades during the bonding process.
Implementation Method 1
applying localized and constant heat and pressure to the sheath assembly laminate
Implementation Method 2
applying localized and constant heat and pressure to the sheath assembly laminate through a vacuum bag
Data Source
AI summary
A bond fixture includes a first fixture having a heater and a plurality of clamps. Each of the plurality of clamps includes a first member and a second member rotatable between a first position and a second position. A second fixture includes a root end lift translatable vertically between a retracted position and an extended position and a root end clamp translatable along a horizontal axis. The root end clamp is configured to cooperate with the root end.