Linear Friction Welder Timing Gear Phasing for Ram Oscillation Control
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Solution Overview
Problem
Linear friction welding (LFW) devices face challenges in achieving consistent welds, requiring massive and expensive components to manage rapid acceleration and deceleration, and complex motor control systems, which limits their efficiency and scalability.
Innovation Solution
A linear friction welding system with two power shafts and a vibrating assembly, where one motor drives a first power timing gear and another motor drives a second power timing gear, with a slave timing gear configuration that allows for controlled oscillation of the ram along a welding axis, enabling precise control of oscillation amplitude and frequency through torque and speed control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional LFW devices use massive components to manage rapid acceleration and deceleration, then the welding process can achieve necessary frequency and amplitude, but the device becomes expensive and complex
Solution Approach 1:
The system divides the power transmission function into two separate power shafts (inner and outer), each driven by independent motors. This segmentation allows distributed control of the oscillation process, eliminating the need for a single massive component while maintaining焊接 consistency through coordinated operation of multiple smaller units.
Solution Approach 2:
The patent implements dynamic control of the two power shafts where their rotational speeds can be independently adjusted. The system transitions from static synchronized operation to dynamic differential operation during welding, allowing real-time optimization of oscillation parameters without requiring oversized components for margin safety.
2Ease of operation
If independent motors with specific speed control are used to phase the power shafts, then oscillation parameters can be controlled, but the motor control system becomes complex
Solution Approach 1:
The control system continuously monitors the rotational positions and speeds of both power shafts, using feedback signals to dynamically adjust motor commands. This closed-loop control automatically maintains the desired phase relationship and oscillation parameters, simplifying operation while reducing control complexity through adaptive regulation rather than complex open-loop programming.
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 system achieves consistent welds with reduced complexity in motor control, allowing for smaller and more cost-effective components, and provides precise control over oscillation parameters, enhancing the efficiency and reliability of the welding process.
Implementation Method 1
pressing one of the two components against the other component with a large amount of force and rapidly moving one of the two components with respect to the other component to generate friction at the interface of the two components. The pressure and movement generate sufficient heat to cause the components to begin to plasticize.
Implementation Method 2
a ram configured to oscillate along a welding axis and two power shafts operably connectable to the ram through a vibrating assembly
Data Source
AI summary
A linear friction welding system includes a processing circuit configured to execute program instructions stored in a memory to control a first motor using one of a torque and speed control, placing a plurality of timing gears in a configuration wherein a fixed projection of one of the timing gears is at a trail position of a slot of another timing gear such that two power shafts of a cam assembly are rotating in phase and a ram is motionless. The processing circuit further controls a hydraulic press to generate a pressure between two components to be welded with the power shafts rotating in phase, and controls the second motor using the one of the torque and speed control to place the timing gears in a second configuration whereat the fixed projection is at a lead position of the slot thereby forcing the ram to oscillate.