RINCO ULTRASONICS AG
Machine description | 3
BA_Standard3000_GB_V5.1_36566
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Welding technology
The following parameters must be used to ensure a high-quality ultrasonic
welding process within tight tolerances:
▪
Amplitude A [μm]
as energy source and
▪
Contact force F [N]
as the interface between the plastic parts to be
welded. It is significantly important to ensure the weld intensity.
The more accurate the two variables can be controlled, the better the
reproducibility of the welding process.
Plastics often have very different melting points.
Especially semi-crystalline thermoplastics such as polypropylene (PP) or
polyoxymethylene (POM) require a high level of energy to reach the melting
point and then become liquid very quickly.
Stop conditions (welding modes)
The stop conditions can be preselected constantly as:
▪ Time
▪ Energy
▪ Travel
▪ Contact breaker
▪ Time and/or energy
.
Limits
can be used to set thresholds that, when exceeded, will cause the
process to be interrupted.
In addition, a prompt dialog can appear on the screen.
Ultrasonic trigger point (trigger)
The presses of the "Standard" series are equipped with a differential pressu-
re measuring system that constantly measures the pressure difference
between the upper and lower end of the piston.
To ensure high reproducibility, the ultrasound is preferably triggered with a
certain prestress force. This is achieved by measuring the pressure diffe-
rence at the pneumatic cylinder.
See Trigger DP in chapter
Programming an initial application [
}
43]
Other triggers such as travel and Time can be set under "System parame-
ters".
Ways to trigger the ultrasound:
▪ Contact force at sonotrode on the object to be welded (differential pressu
-
re measurement)
▪ Vertical travel coordinates of the sonotrode
▪ Time from press rest position
3.6
Fig. 20:
Welding parameters -
contact force and amplitude
Fig. 21:
Stop conditions
