| (2) Mold Platen
Mold platen is a structural element facing the bolster,
and it has T-shape grooves that take in the upper mold. Mold plate is
connected to the clamping cylinder piston of moving plate in a way that
it moves vertically as mold open/close cylinders are running vertically.
It is designed to put pressures on the mold by the vertical movement of
clamping cylinders or detach the mold from molding products.
(3) Moving Platen
Moving platen is connected to the mold. It opens and closes
(moving up and down) the mold via mold close/open cylinders, and it generates
molding clamp with its built-in clamping cylinders that supply clamping
pressures on injected resin. In addition, the moving platen is built with
lock system that secures it to tie-bar to prevent it from being pushed
back and safety system that secures it when it is up to keep if from dropping
due to gravity.
(4) Lock System
Lock system is designed to secure the moving platen to
the tie-bar to prevent the moving platen from being pushed back when clamping
pressure is applied to the mold located between the molding platen and
the fixing platen.
(5) Clamping Cylinder
Clamping cylinders generate to keep the mold from being
pushed back and supply clamping pressure on injected resin. They are built
on the moving platen and connected to the mold platen by piston load
(6) Mold Open/Close Cylinders
These cylinders open and close the moving platen, and
they are built on right side of the fixing platen diagonally across from
the left side of the platen.
They are connected to the moving platen by pistons.
(7) Tie Bar Tie bars support clamping power, and 4 tie bars are located
between the fixing platen and the support platen. They also guide the
movement of the die platen. Tie bars may be broken if mold has a bad parallel
balance or repeated run is done with a clamp power over the standard.
Therefore, the operator must be care, must appropriate oil or grease to
guide part and must maintain cleanness.
(8) Tie Bar Support
Tie bar support is designed to provide support at the
upper part to the tie bars,
which are supported by the fixing plate at the lower part.
(9) Ejector Cylinders
Ejector cylinders, located at the center of the fixing
plate, are designed to send out products after molding movement through
the eject bar by moving up and down.
Products or the mold may be damaged when the power generated by the upward
moving ejector and stroke do not match; extra caution should be exercised.
(10) Safety System
Low pressure Injection molding machines are built with
following safety system to ensure safe molding operation.
* Photoelectric Safety Device
Installed on the ejector operation side, it stops closing movement of
the mold when the lifted moving platen is dropping due to its gravity.
* Mechanic Safety Device Installed on the upper part of the moving plate,
it stops closing
movement of the mold by the saw-toothed lock device when the lifted moving
platen is dropping due to its gravity
* Safety Bar
When it is necessary to put a body part into the inside of the mold to
repair or removeforeign objects, safety bar located on the left side of
operation area can be pushed into the area between bolster and moving
platen to prevent closing movement of the mold.
* Start Button Switch
This switch is used when an operator(s) starts the cycle.
The number of operators can be chosen so that 1 or 2 operators can use
the machine. Selected safety bar can be pushed into the area between bolster
and moving platen to prevent closing movement of the mold.
* Emergency Stop Switch
There are five locations where the emergency stop switches are located;
inside the
control box located on the right side of operation area, near the safety
bar located on the left side of operation area, inside the injection manual
control box, and upper area of hydraulic tank. When used, pumps and the
all operations will stop.
* Alarm Buzzer
The alarm buzzer will sound when 1cycle is activated or when a bolster
is being moved.
(11) Bolster & Moving unit
This unit, located on each side of injection molding machine,
is designed to install the low mold, and it moves horizontally by hydraulic
motor.
Structure of Injection Unit
Injection unit is a key component of Low preesure injection
molding machine that injects the adequate amount of plastic resins, which
are properly mixed and heated, to the mold.
The major parts of injection unit can be divided as follows
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