Clamping Phase; Welding Phase; Hold Phase - Dukane 5000 Series User Manual

Linear Vibration Welder 5000 Series
If the compressed air supply is not turned on, the door will
not be able to move. In this case, the lift table will begin
to move, but will stop after a short time because the door-
open sensor has not been released. Again, the welder will
stop and must be reset.

Clamping Phase

As the access door begins to close, the lift table rises until
it reaches either the preset trigger position or zero motion
is achieved (depending on whether trigger-by-position or
trigger by zero motion force is selected). This is illustrated
in Figure 5- 2.

Welding Phase

When the table reaches the trigger point, the magnetic drive
heads are energized for the programmed time (typically a
few seconds) or until the programmed collapse distance is
achieved. This is illustrated in Figure 5-3. The drive head
vibrates the upper part against the fixed lower part, under
relatively high pressure which results in frictional heating.
This heating melts the joint surfaces and continues until
the melt layer has sufficiently penetrated the material. The
frequency of vibration is between 200 and 240 Hz, and the
total vibration amplitude can be set to between 0.020 and
0.070 inches (0.5 to 1.8mm). The weld cycle can be set
to run for a predetermined time (0.01 to 30.00 seconds)
or until a specified collapse distance (0.10 to 8.00mm) is
achieved.

Hold Phase

After the welding phase is complete, the parts are held
together under pressure for the hold time. This allows the
molten plastic to fuse together and solidify. Clamping
under pressure while the bond hardens. This clamping also
corrects any warping problems by forcing the parts into the
proper geometry. The hold pressure is specified separately
from the welding pressure to control flash and produce a
stronger weld by reducing shear thinning.
Page 36
User's Manual
Figure 5 - 2 Parts Clamped Together at Trigger Point
Electromagnetic Lamination
Drive Head Carrier
Figure 5 - 3 Parts Being Welded Together
NOTE
Hold time should be no less than half
of actual weld time. It is usually best
to set hold time equal to weld time.
Dukane Manual Part No. 403-589-01
Parts Clamped
Lift Table
Springs
Vibration