Linear Friction Welding Vibration Assembly
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Solution Overview
Problem
Linear friction welding has not been practical for repair welds due to limitations in generating sufficient heat and mechanical advantages in the welding process.
Innovation Solution
The linear friction welding apparatus incorporates a vibrating assembly that simultaneously vibrates both work pieces along the weld axis, using separate oscillators or a single oscillator with rocker arms and linkage mechanisms to control amplitude and frequency, and instantly stops oscillation to form a weld.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single work piece is vibrated against a fixed work piece in conventional linear friction welding, then the welding process can be performed with simpler apparatus, but insufficient heat is generated and the process is not suitable for repair welds
Solution Approach 1:
The patent combines the vibration functions for both work pieces into a single integrated vibrating assembly with a common oscillator, rather than using separate vibration sources. This merging approach generates sufficient heat through dual work piece vibration while avoiding the complexity of multiple independent oscillation systems
Solution Approach 2:
The patent applies mechanical vibration to both work pieces simultaneously along the weld axis using a synchronized oscillation mechanism. This dual vibration approach significantly increases frictional heat generation at the interface compared to conventional single work piece vibration, enabling the process to be suitable for repair welds
2Temperature
If separate vibrating assemblies with independent oscillators are used to vibrate each work piece, then greater vibration amplitude and heat generation are achieved, but the apparatus complexity and power demands increase
Solution Approach 1:
The patent merges the oscillation functions into a single oscillator that drives both work pieces through a synchronized mechanism. This shared oscillation source reduces the total power requirements compared to two independent oscillators while maintaining the vibration amplitude necessary for sufficient heat generation
Solution Approach 2:
The vibrating assembly is segmented into two synchronized oscillation systems that share a common power source and control mechanism. This segmentation allows each work piece to receive adequate vibration for heat generation while the shared oscillator reduces overall power consumption and apparatus complexity
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 enhances mechanical advantages, allowing for effective bonding of components by generating sufficient heat and providing greater vibration amplitude with reduced component size and power demands, making the process suitable for repair welds.
Implementation Method 1
rapidly vibrating the components with respect to one another to generate friction at the interface between the two components. The pressure and movement generate sufficient heat to cause the material at the interface to plasticize.
Implementation Method 2
simultaneously moving, with a vibrating assembly spaced apart from the press axis, the first fixture and the second fixture along a single weld axis so that both the first work piece and the second work piece are moved with respect to one another along the single weld axis
Data Source
AI summary
A method of operating a linear friction welding apparatus includes supporting a first work piece with a first fixture, supporting a second work piece with a second fixture, establishing a load between the first work piece and the second work piece along a press axis with a press assembly while the first fixture and the second fixture are in a fixed position relative to one another, simultaneously moving, with a vibrating assembly spaced apart from the press axis, the first fixture and the second fixture along a single weld axis so that both the first work piece and the second work piece are moved with respect to one another along the single weld axis after establishing the load, and heating at least a portion of the first work piece while simultaneously moving the first fixture and the second fixture under the load.