Airfoil Root Polishing via Gravity-Actuated Fixture
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Solution Overview
Problem
Manual polishing of airfoil roots in gas turbine engines is ergonomically and safety challenging, and results in undesirable variations due to operator inconsistencies.
Innovation Solution
An automated apparatus with a fixture, actuation cylinder assembly, rotating brush, motor, switch, and control circuitry that moves the airfoil root into contact with the brush for controlled polishing, ensuring consistent and safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual polishing is used with operator holding blade root in contact with rotating polishing brush, then flexibility and simplicity are maintained, but ergonomic and safety concerns arise and polishing consistency deteriorates
Solution Approach 1:
The workpiece holder automatically moves the airfoil root into contact with the rotating brush through gravitational force when tilted, eliminating the need for operator manual contact with the rotating brush. The system serves itself by using the workpiece's own weight and positioning to achieve the polishing action.
Solution Approach 2:
The operator is extracted from the direct polishing operation. The manual handling and positioning tasks previously performed by the operator are replaced by the automated holder mechanism, separating the operator from the hazardous and repetitive contact with the rotating brush.
2Manufacturing precision
If manual polishing operations are performed by operator, then device complexity remains low, but polishing precision and consistency worsen due to operator variation
Solution Approach 1:
The holder mechanism automatically ensures consistent positioning and contact pressure by using the workpiece's own weight and the fixed geometry of the holder-brush arrangement. Each polishing operation is self-regulating, eliminating variability between operators.
Solution Approach 2:
The holder is designed to tilt and move dynamically during the polishing operation, allowing the workpiece to naturally engage with the brush at the correct angle and pressure. This dynamic adjustment ensures consistent polishing conditions without requiring complex control systems.
3Extent of automation
If automated polishing system is implemented with fixture and actuation cylinder, then operator safety improves, but device complexity increases
Solution Approach 1:
The system uses the workpiece's own gravitational force to perform the positioning and contact-making actions. By tilting the holder, gravity automatically moves the airfoil root into contact with the brush, eliminating the need for complex actuation cylinders, sensors, and control systems.
Solution Approach 2:
Complex mechanical actuation systems (cylinders, motors, sensors) are replaced by a simple gravitational mechanism. The automation is achieved through the natural force of gravity acting on the tilted holder, rather than through powered mechanical systems.
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
The solution provides reliable and repeatable polishing, reducing ergonomic and safety concerns while minimizing capital costs by eliminating the need for complex brush actuation equipment and sensors.
Implementation Method 1
polishing operations were performed manually with an operator manually holding a blade root in contact with a rotating polishing brush
Data Source
AI summary
An apparatus for polishing an airfoil root includes a fixture for holding the airfoil, an actuation cylinder assembly for moving the fixture holding the airfoil, a brush, a motor for rotating the brush, a switch, and control circuitry. The actuation cylinder assembly is configured to move the fixture holding the airfoil toward the brush to trigger the switch, and the control circuitry is configured to run a timer when the switch is triggered to control contact between the airfoil and the brush for polishing.