Hauptmenü:
a) principle
- electrical energy is in ultrasonic welding machine change into vibrations with high frequency (usually 20.000 Hz or 40.000 Hz)
- this movement is transeferred by special sonotrode to parts
- one part is moving and the second is holding in the position - it causes friction, which is melting the material
- the machine press both parts together and after cooling are the parts bounded
b) cycle
- insert of parts into the jig and start the ultrasonic welding machine
- sonotrode goes down to parts a start the welding (very short - just several tenths of second)
- the holding force is increased after welding
- the parts are cooling down
- sonotrode goes to the start position
- removing of assembly from ultrasonic welding machine
c) advantages of ultrasonic welding
- when used correctly, are excluded material changes outside the welding zone
- very rigorous
- it's possible to weld visually challenging parts
- very fast process
d) disadvantages of ultrasonic welding
- usually is not possible to weld different types of material (the melting temperature needs to be very similar +/-10-15°C)
- the parts need to be ready for ultrasonic welding - special edges
e) other utilization of this technology
- it's possible to press metal inserts into plastic parts
- riveting - the parts can be made from different materials