Workpiece misunderstanding
Ultrasonic welding machines also have requirements for the material of the workpiece to be welded. Not all materials can be welded. Some people understand that any material can be welded. This is a big misunderstanding.
Process error
Ultrasonic energy is an instantaneous burst, the weld should be a point or a line, and the distance to be transmitted must conform to the ultrasonic welding method. Some people think that as long as it is a plastic material, no matter how the joint surface can be welded well, this is also a misunderstanding.
Structural misunderstanding
There are many types of ultrasonic molds (HORN). The shape of the workpiece determines the shape of the mold. However, the size, curvature and material of each part must be strictly calculated. Some people mistakenly think that it is just a metal block.
Power misunderstanding
The output power of the ultrasonic wave is determined by the diameter and thickness of the piezoelectric ceramic piece, the material, and the design process. Once the transducer is shaped, the maximum power is also fixed. Measuring the output energy is a complicated process, not a The larger the transducer, the more power the circuit uses and the higher the output energy. It requires a fairly complex amplitude meter to accurately measure its amplitude, since most users are too knowledgeable about ultrasound and some The misleading sales staff gives consumers a wrong understanding.
Model selection misunderstanding
How much output power is used, the oscillation frequency and the amplitude range should be considered according to the material of the workpiece, the area of the wire bond, whether there are electronic components in the workpiece, whether it is airtight or not.
Principle misunderstanding
A considerable number of people engaged in ultrasonic welding for many years have a misunderstanding about the transmission of ultrasonic energy. It is considered that the sound wave is welded on the contact surface. In fact, this is a misunderstanding. The real welding principle is: After the transducer converts electrical energy into mechanical Conducted by the material molecules of the workpiece, the acoustic impedance of the sound wave in the solid is much smaller than that in the air. When the sound wave passes through the joint of the workpiece, the sound resistance in the gap is large, and the heat energy generated is quite large.
2017-03-25
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