Causes of heat generation when the transducer is in use
In the working process of an ultrasonic welding machine, the transducer used will generate heat, which can be summarized as the following three reasons:
The first is that the workpiece to be welded will heat up, or the material that has undergone ultrasonic treatment will heat up, or after a long time of work, both the ultrasonic mold (tool head) and the welding head will heat up, and the heat will be transferred to the transducer superior.
The second is the power loss of the transducer itself. Because 100% energy conversion efficiency cannot be achieved in the welding process, part of the lost energy must be converted into heat. When the temperature rises, it will change the parameters of the transducer and gradually deviate from the best matching state. What's more serious is that excessively high temperature will cause the performance of piezoelectric ceramic wafers to decrease. In this way, the working condition of the transducer becomes worse, and the heating speed becomes faster, which becomes a vicious circle. Therefore, it is necessary to provide a good cooling condition for the transducer, which is generally air-cooled at room temperature. Of course, cold air wind can also be used for cooling. Under normal circumstances, the temperature rise of the transducer is normal. Under normal cooling conditions, there will generally be no major problems.
In the continuous operation and use, we have also observed a third reason, that is, the transducer and the driving power supply have not reached the best working condition when the customer is operating the machine, causing the heat generated to be very large and uncontrollable. Serious consequences. When the temperature is too high, the mechanical strength of the aluminum material will drop drastically. Under such high power, cracks in the transducer are inevitable. A good product is damaged due to improper use, which increases the customer's cost.