Specifications
D-M-E
Runnerless Molding Systems
61
The Hot-One System
4.
Head Height :
Install the nozzles into their respective counterbores. Do
not install the nozzle seal rings at this time. Check the
height from the top of the nozzle head to the plate in
which the nozzles are installed. (
Figure 3
)
(Figure 3)
Grinding Support Pads :
Note:
Mark the nozzle bodies on their outer diameter with the
location in which they will be installed.
Pay particular attention to systems that utilize different
length nozzles. On multi-cavity molds, the marked
number will normally reflect the cavity number, which in
turn will match the temperature control zone number.
Each nozzle counterbore should be numbered with its
appropriate location. Use the “U” corner as a location
reference.
With each manifold and component system,
D-M-E
supplies a wiring diagram indicating probable locations.
If the supplied diagram does not suit your needs, it is
important that the diagram be remarked or a new
diagram be made.
A copy of the revised wiring diagram should be forwar-
ded to
D-M-E
’s Applications Engineering Department to
keep the system file current. This will facilitate trouble-
shooting any problems that might arise at a later time.
5.
If needed, size the manifold center support to a dimen-
sion of +0.000 to -0.025 mm to the height of the nozzle
heads found in Step 4. Grind both sides of the center
support pad to ensure parallelism.
(Please note: The support pads are manufactured from a
non-magnetic material. Fabricate a fixture plate to the
grinder.)
6.
Properly position the manifold using two dowel pins. The
first dowel will be located at the center of the manifold.
Install this dowel through the center support pad. The
second dowel location normally will be positioned at one
of the manifold ends.
The end location will be machined in the form of a slot,
which will allow for expansion of the manifold when it
reaches operating temperature. The length of these
dowel pins should be 1.5 mm less than the combined
depths of their installation holes in the nozzle (or “A”) pla-
te and the manifold, plus the height of the center support
pad determined in Step 6. The 1.5 mm dimension ensu-
res that the dowels do not hold the manifold off the nozz-
les.
The use and proper location of these dowels is impor-
tant to ensure nozzle drop locations line up accurately
with the nozzle flow channel holes. Install dowel pins
and check that their height meets the above criteria.
7.
Check the manifold thickness (dimension “H”). Do not
include the reflector plates in this measurement.)
Next, test-fit the manifold block over the nozzles and
dowel pins, making sure that the manifold lies flat across
the nozzles with no rocking motion.
8.
Establish the “D” dimension by adding the average “C”
dimension to the “H” manifold thickness.
(
Figure 4
)
9.
Before installing the manifold retainer plate, check the
thickness of the retainer plate (dimension “E”).
Carefully install the manifold retainer plate taking care
not to pinch any wiring. Check for proper clearance
around the perimeter of the manifold to the manifold
retainer plate, and also around the manifold heater
termination areas.
Note:
It may be necessary to machine clearance slots in the
manifold retainer plate to clear the nozzle heater leads.
10.
Size and install the upper support pads into the under-
side of the top clamp plate. (Please note: The upper
support pads are manufactured from a non-magnetic ma-
terial. Fabricate a fixture to the grinder to hold the sup-
port pad.) This dimension will be the difference between
the “E” dimension minus the “D” dimension minus cold
clearance.
Seal ring pocket
Nozzle plate
Head height "C"
Guidelines for the use of a manifold block
Dowel pin
Riser pad
Nozzle seat
Manifold retainer plate
Dowel pin
Nozzle plate
"E"
"D"
"H"
1,5
1,5