The cause and treatment of the heating of the ultrasonic transducer
Ultrasonic transducers will generate heat when used, which is mainly caused by three reasons. One is that the workpiece to be welded will heat up or the material processed by ultrasonic will heat up, or the ultrasonic mold (horn) and the horn will heat up for a long time, and these heat will be transferred to the transducer. The second is the power loss of the transducer itself. Since 100% energy conversion efficiency cannot be achieved, the part of energy lost must be converted into heat. The temperature rise will cause changes in the parameters of the transducer, which will gradually deviate from the best matching state. What is more serious is that the temperature rise will cause the degradation of the piezoelectric ceramic wafer performance. This in turn makes the transducer work worse and heat up faster, which is a vicious circle. Therefore, we must provide good cooling conditions for the transducer, which is generally air-cooled at room temperature; if necessary, cold-air air cooling can also be used. Under normal conditions, the temperature rise caused by these two points is also normal. Under normal cooling conditions, there will be no major problems.
In practice, we found that there is a third reason, which is that the customer failed to match the transducer and the ultrasonic power supply to the best working condition during use. The heat caused by this is very large and uncontrollable. Have serious consequences. At the same time, the temperature is high, the mechanical strength of the aluminum material drops sharply, and under the action of high power, cracking is inevitable.
