Branson DC 222, Operating Manual

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Functional Description
3-3 Digital Compact
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3.2 Sequence of a Weld Cycle
When you operate a press unit or send a START signal to the unit, this
causes the weld cycle to be started. A weld cycle involves the following
steps:
l
The horn descends and contacts the workpiece.
l
The joining force is built up.
l
Ultrasonic energy is released by a signal sent to the power supply.
The ultrasonic energy is then fed to the horn.
l
The weld is performed by the trigger force and the weld force. The
trigger force is the pre-set contact pressure force at which ultrasonic
energy is released whereas the weld force is the force being exer-
ted into the workpiece during welding.
l
When the weld time ends or the weld distance has been effected,
the ultrasonic output is terminated. The molten mass in the joint
solidifies. This is known as hold time.
l
The horn is lifted from the workpiece.
l
If the work piece sticks to the horn, an optional afterburst can be
activated. This results in the work piece to be detached from the
horn.
The weld cycle is completed.
3.3 Application Evaluation
If your application has been analysed in the BRANSON Applications
Laboratory, consult the BRANSON Lab Report for appropriate settings.
In case you have no Lab Report, proceed as follows:
Ask the BRANSON Applications Laboratory for default parameters
(e.g. time, distance, force, velocity) suited for your application. Adjust
individual parameters until you have achieved the best weld results for
your application.