Pick To: in the process of ultrasonic plastic welding, in view of the acoustic system input signal affected by load changes directly welding process, a ultrasonic signal test system is developed, can be in the process of ultrasonic plastic welding power, voltage, current RMS, phase difference and the frequency signal fast accurate on-line detection, etc. Moreover, the measurement results can be recorded and analyzed in real time. The test results show that the ultrasonic signal can reflect the change of welding process effectively, which provides the possibility to realize the quality control of welding process. The system can also be applied to other fields of power ultrasound.
At present, ultrasonic plastic welding quality control has been widely paid attention to by welding workers, and the premise of its quality control is the extraction and detection of welding process quality information. The core part of ultrasonic welding equipment is the acoustic system, which can convert the input high-frequency electrical signal into mechanical vibration of the same frequency, acting on the welder. Plastic in the welding process to undergo heat softening, melting, wetting spread and a series of changes, the situation is very complex.
The change of the mechanical state of the weldment in the welding process is inevitably reflected in the change of the electrical signal of the electromechanical conversion device of the acoustic system. Therefore, it is very important to study the change of input electrical signal in ultrasonic plastic welding process to extract the quality information of welding process.
In order to study the dynamic change of ultrasonic plastic welding process, it is necessary to measure the electrical parameters of the ultrasonic transducer online. At present, there is no special high-power ultrasonic electrical signal detection equipment in the market, the detection of high-power ultrasonic electrical signal mainly adopts memory oscilloscope, power meter and vibration meter, or other power frequency electrical signal detection equipment to replace.
Ultrasonic plastic welder of ultrasonic transducer not only input power is large (from hundreds of watts to a few kilowatts), welding time is very short only about 1 s, and the load change is very complex (not pure resistance), so that its signal waveform often has a certain degree of distortion. This makes the current commonly used detection equipment is difficult to meet the needs of ultrasonic welding electrical signal detection. In THIS paper, A MULTIfunctional ultrasonic signal detection system is developed, which can measure the effective value, power, phase difference and frequency of the input ultrasonic transducer in real time, and can record and analyze the measurement results at any time, and draw the measurement curve.
In the next part, we will refer to the measurement of voltage and current during ultrasonic welding. If you are interested in our content, please pay attention and bookmark our article, and feel free to contact us if you have any questions.
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Post time: Oct-17-2022