Ultrasonic Welding Frequency Tracking for Resonance Stability
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Solution Overview
Problem
The ultrasonic welding system for mask production experiences instability and false welding due to the natural frequency drift of the transducer caused by changes in welding load, temperature, and environment, leading to inconsistent welding quality.
Innovation Solution
A control method that continuously detects the working frequency of the ultrasonic generator and adjusts it to find and maintain the anti-resonance point within a dynamically updated frequency searching range, ensuring the system operates at resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the ultrasonic generator works in a fixed frequency mode, then the device complexity is reduced, but the welding stability deteriorates due to natural frequency drift of the transducer
Solution Approach 1:
The patent implements automatic frequency tracking by detecting the impedance characteristics of the transducer and adjusting the generator frequency accordingly. The control system continuously monitors the transducer's natural frequency changes caused by temperature, load, and environment variations, and automatically adjusts the operating frequency to maintain resonance, thereby resolving the contradiction between simple fixed-frequency control and stable welding performance.
Solution Approach 2:
The patent transitions from static fixed-frequency operation to dynamic frequency adjustment. The system adapts the operating frequency in real-time based on the transducer's changing characteristics, allowing the ultrasonic welding system to maintain optimal resonance conditions despite variations in temperature, welding load, and environmental factors.
2Ease of operation
If the working frequency is not adjusted to track natural frequency changes, then the ease of operation is improved, but the manufacturing precision deteriorates due to false welding and desoldering
Solution Approach 1:
The ultrasonic welding system performs self-adjustment of the operating frequency without requiring manual intervention. The control system automatically detects when the transducer's natural frequency drifts and adjusts the generator frequency to maintain resonance, eliminating the need for operator involvement in frequency tuning while ensuring consistent welding quality.
Solution Approach 2:
The system uses impedance detection as feedback to automatically adjust the operating frequency. By monitoring the transducer's electrical characteristics and comparing them against resonance conditions, the control system self-corrects frequency deviations, maintaining high welding quality without requiring operator attention or manual adjustment.
3Loss of time
If the ultrasonic generator frequency does not change with transducer natural frequency drift, then the loss of time is reduced, but the reliability deteriorates due to inability to work at resonance point
Solution Approach 1:
The patent implements continuous frequency tracking during welding operations. Rather than performing discrete frequency adjustments that would interrupt production, the system continuously monitors and adjusts the operating frequency to maintain resonance, ensuring uninterrupted welding operations with consistent quality without significant time loss.
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 welding stability, prevents false welding and desoldering, and consistently ensures high-quality welds by maintaining resonance frequency alignment with the system's output.
Implementation Method 1
the ultrasonic generator generates high-voltage and high-frequency signals, and the signals are converted into high-frequency mechanical vibration through the ultrasonic transducer
Implementation Method 2
the natural frequency of the transducer can drift along with the changes of factors such as welding load, transducer temperature, environment temperature and the like; at this time, if the power frequency of the ultrasonic generator does not change, the ultrasonic welding system cannot work at the resonance point
Data Source
AI summary
A control method of an ultrasonic welding system comprises: detecting operation of the ultrasonic welding system immediately while the ultrasonic welding system is in a working state; acquiring a current working frequency of an ultrasonic generator in the ultrasonic welding system while the ultrasonic welding system is detected to complete a preset first operation every time; determining a current frequency searching range of the ultrasonic generator according to the current working frequency of the ultrasonic generator; controlling the ultrasonic generator to search for an anti-resonance point in the current frequency searching range; and adjusting the working frequency of the ultrasonic generator to be an anti-resonance point while the anti-resonance point is searched in the current frequency searching range.