28Kh Ultrasonic Piezoelectric Electric Converter for Ultrasound Portable Riveting Machine

Description:

The ultrasonic transducer can generate regular vibration under the excitation of a suitable electric field, and its amplitude is generally about 10 μm. Such amplitude is not enough to directly complete the welding and processing steps. Therefore, the transducer links a properly designed ultrasonic horn, and the amplitude of the ultrasonic wave can be varied within a wide range, as long as the material strength is sufficient, the amplitude can exceed 100 μm.

The transducer converts the ultrasonic frequency voltage from the generator into ultrasonic mechanical vibration of the same frequency by an inverse piezoelectric effect. It consists of a number of piezoceramic sheets sandwiched between two metal (usually titanium) blocks. A thin metal plate is formed between the sheet and the sheet to form an electrode. When a sinusoidal electrical signal is supplied to the transducer via the electrodes, the piezoelectric sheet expands and contracts, producing an axial peak-to-peak motion of 15-201 xm. The transducer is a precision device and should be handled with care.

Specifications:

Ultrasonic technology:

In ultrasonic welding, it is common for the surface of the product to be scratched, broken or cracked at the joint. Because there are two situations in ultrasonic operation: 1. High thermal energy directly contacts the surface of the plastic product 2. Vibration conduction. Therefore, when ultrasonic vibration is applied to plastic products, the surface of the product is prone to burns, and plastic columns or holes with a thin thickness of 1 m/m are also prone to cracking. This is a prerequisite for ultrasonic operation. Avoided. On the other hand, due to the lack of ultrasonic output energy (extension table and HORN upper mold), it takes a long time to weld when the vibration friction energy is converted into heat energy to accumulate thermal energy to compensate for the lack of output power. This kind of welding method is not the vibration friction heat energy that is achieved in an instant, but the welding time is required to accumulate the heat energy, so that the melting point of the plastic product reaches the welding effect, so that the heat energy stays on the surface of the product for too long, and the accumulated temperature And stress will also cause burns, breaks or breaks in the product. At this time, it is necessary to consider the power output (number of segments), welding time, dynamic pressure and other factors to overcome this type of job loss.
Solution:
1. Reduce the pressure.
2. Reduce the delay time (early vibration)).
3. Reduce the welding time.
4. Quote media coverage (eg PE bags).
5. The mold has a surface treatment (hardened or chrome plated).
6. The number of machine stages is reduced or reduced.
7. For products that are easily cracked or broken, the fixture should be made into a buffer, such as soft resin or covered cork (this means does not affect the welding strength).
8. Easy to break products add R angle at right angles.

28Kh Ultrasonic Piezoelectric Electric Converter for Ultrasound Portable Riveting Machine