The ultrasonic wave principle and Application Technology

The ultrasonic wave principle and Application Technology

What is meant by ultrasonic welding? In ultrasonic vibration while applying pressure to the plastic products, with a portion of the generated by friction heat softening, method of welding together.

Acoustic sound intensity and frequency is proportional to the square, and the ultrasonic frequency is much larger than the audible sound wave. Thus an ultrasonic sound intensity is much greater than the audible sound sound intensity. This is the important reason of ultrasonic energy for flaw detection.

Ultrasonic cleaning principle is composed of ultrasonic generator sends out high frequency oscillatory signal, through the transducer into high frequency mechanical vibration and spread to medium, solvent cleaning ultrasonic cleaning fluid density in the forward-and radiation, so that the liquid flow generated tens of thousands of tiny bubbles present in the liquid, the tiny bubbles in the field under the action of vibration, when pressure reaches a certain value, the bubble increases rapidly, and then suddenly closed, in the bubble is closed when the shock wave, around which generate thousands of atmospheric pressure, failure of insoluble contaminants to scatter them in the cleaning liquid, when a group of particles are oil wrapped and adhesion in cleaning the surface, oil to be emulsified, solid particles and detachment, thereby achieving the purpose of purifying cleaning parts. While the cleaning effect can reach 90%. This high-tech products does save a lot of manpower, material resources and time, can fully meet the current era people simple and efficient way of life. Therefore, R & D and throw on the market only ten years short, then obtains the rapid promotion. Now has become an industry, especially the car care, such as an inevitable trend of the industry. Sales potential is considerable.

In addition, in the use of ultrasonic treatment of sharp cutter blade, electronic machinery used in thin metal films, due to cavitation damage things often happen, and it is the low frequency ultrasonic cavitation intensity is larger. Therefore, in the use of ultrasonic cleaning, the cleaning of the shape of the object, the nature of the material must be taken into account. Only select the appropriate ultrasonic frequency, using appropriate method can obtain the good cleaning effect.

Role of ultrasonic cleaning is a very complex process, here makes one simple introduction. The ultrasonic effects include ultrasonic itself has the effect of energy, the energy released when cavitation damage effect and ultrasonic on medium stirring flow effect.

Ultrasonic is a kind of elastic medium mechanical oscillation, which is in contact with the medium of the oscillation source caused by, their frequencies above 20KHz. Ultrasonic linear transmission mode, the higher the frequency, the diffraction ability is weak, but the reflection of ability is more strong. Ultrasonic wave propagating in the medium at different interfaces with reflection character, because it has strong directivity, good direction, transmitted energy, communication distance etc., used to measure the object distance, thickness, liquid level. The propagation velocity of ultrasonic wave and medium density and elastic properties, it spread in the air speed is 340m / s. Launch a certain frequency ultrasonic, with air medium communication, reach a measurement target or obstructions after back reflection, the experience of the time length and the propagation of ultrasonic distance proximity, a test transmission time can be derived from the long. Using the ultrasonic characteristics, SCM control, electronic counting can be combined to achieve non-contact distance. As a result of ultrasonic testing, convenient rapid, simple calculation, and is not affected by light, electromagnetic wave, dust and other disturbances, the measuring precision is higher. Commonly used in the bridge, culvert, tunnel distance detection.

We know that, when the vibrating objects will sound. The scientists will be the number of vibrations per second is called frequency of sound, it is the unit hz. We the human ear can hear sound wave frequency is 20 ~ 20000 hz. When sonic vibration frequencies greater than 20000 Hz or less than 20 Hz, then we can't hear. Therefore, we put the frequencies higher than 20000 Hz waves called" ultrasonic". Often used in medical diagnostic ultrasonic frequency is 1 ~ 5 mhz. Ultrasound is a good direction, strong penetrating ability, easy access to more focused acoustic energy in the water, transmission distance and so on. Can be used for distance, velocity, cleaning, welding, such as gravel. In the medical, military, industry, agriculture has the obvious effect.

The principle of ultrasonic welding machine is achieved by an ultrasonic generator will be 50 / 60 Hz current into 15, 20, 30 or 40000 Hz electric energy. High frequency electric energy is converted through the transducer were converted back into the same frequency of mechanical movement, followed by a set of mechanical motion and can change the amplitude modulation device is delivered to the welding head. Head received vibration energy is delivered to the workpiece to be welded junction, in the region, the vibration energy is converted into heat energy by friction, the plastic melt. Ultrasound can be used not only to welding of hard thermoplastic plastics, can also be processed fabrics and films.

| Updated:2012.01.19    Source:    Clicks:
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