Rod Guide Assembly Welding Fixture for Spring Seat Repair
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Solution Overview
Problem
The maintenance of aircraft engine fuel control units requires frequent replacement of components, leading to wastage and high costs, as existing methods destroy the rod guide assembly during disassembly, lacking a suitable method for resecuring the spring seat to the rod for continued use.
Innovation Solution
A method involving electron beam welding with a circular beam deflection pattern is used to securely attach a replacement spring seat to the existing rod of the rod guide assembly, along with a fixture to align and clamp the components during welding, allowing for the reuse of existing parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If conventional disassembly methods are used to replace components in fuel control units, then component replacement can be performed, but the rod guide assembly is destroyed and cannot be reused, leading to high costs and waste
Solution Approach 1:
The invention enables recovery of the rod guide assembly by developing a welding process that can reattach the spring seat to the rod. Instead of discarding the entire assembly when the spring seat disconnects, the rod guide assembly is recovered through precision welding techniques that rebuild the connection without destroying the rod or other critical components.
Solution Approach 2:
The invention replaces conventional mechanical disassembly methods with electron beam welding technology. This substitution allows for precise reattachment of the spring seat to the rod, enabling repair rather than replacement of the rod guide assembly, thus reducing waste and maintenance costs.
2Ease of repair
If the spring seat is disconnected from the rod during maintenance, then the spring seat can be replaced, but existing methods lack a suitable technique for resecuring it to the rod, requiring complete assembly replacement
Solution Approach 1:
The invention introduces electron beam welding as a sophisticated manufacturing process to replace simple mechanical attachment methods. The electron beam welding system with circular beam deflection pattern provides precise control for resecuring the spring seat to the rod, enabling complex repair tasks to be performed with high precision and reliability.
3Reliability
If frequent component replacement is performed in fuel control units, then maintenance requirements are met, but costs increase and waste is generated
Solution Approach 1:
The invention recovers valuable components (rod, spring seat, and other parts of the rod guide assembly) that would otherwise be discarded during maintenance. By enabling repair through welding rather than replacement, the lifecycle of these components is extended, reducing the consumption of new materials and manufacturing resources.
Solution Approach 2:
The invention changes the physical state and properties of the materials through electron beam welding, creating strong metallurgical bonds between the spring seat and rod. This parameter change in the material structure enables durable repairs that maintain the reliability of the fuel control unit while reducing the frequency of complete replacements.
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 enables the cost-effective reuse of components by securely welding a new spring seat to the existing rod, reducing waste and maintenance costs while maintaining the integrity of the fuel control unit.
Implementation Method 1
welding a replacement spring seat to the rod by: with the rod disposed on a first side of a wall of the replacement spring seat, directing an electron beam toward the wall of the replacement spring seat from a second side of the wall opposite the first side
Implementation Method 2
controlling the electron beam using a circular beam deflection pattern
Data Source
AI summary
A method of repairing a rod guide assembly of a fuel control unit of an aircraft engine is provided. The method comprises disconnecting a used spring seat from the rod of the rod guide assembly and welding a replacement spring seat to the rod using an electron beam controlled using a circular beam deflection pattern.