Just as with overall product design, mold design is another
opportunity to prevent defects during the injection molding
process. We have previously written blogs on the Top 10 Injection
Molding Defects and Avoiding Mistakes in Injection Molding, but
here are some examples of how poor mold design can be a costly
mistake:
Not designing the proper draft: This refers to the angle at which
the finished product is ejected from the mold. An insufficient
draft can lead to ejection problems, costing significant time and
money.
Improperly placed or sized gates: Gates are the openings in a mold
through which thermoset or thermoplastic material is injected. Each
will leave a vestige (scar), which can create aesthetic or
functional problems if not properly placed.
The number of parts (cycles) required, as well as the material they
will be made of will help drive decision-making as to how and with
what materials to create the mold.
When a product has been properly designed, approved, and die cast,
it’s time to start the actual manufacturing! Here are the basics of
the injection molding process…
Thermoset or thermoplastic material in granular form is fed through
a hopper into a heating barrel. (Learn more about the differences
between plastics in our PLASTICS course.) The plastic is heated to
a predetermined temperature and driven by a large screw through the
gate(s) and into the mold. Once the mold is filled, the screw will
remain in place to apply appropriate pressure for the duration of a
predetermined cooling time. Upon reaching this point, the screw is
withdrawn, the mold opened, and the part ejected. Gates will either
shear off automatically or be manually removed. This cycle will
repeat over and over, and can be used to create hundreds of
thousands of parts in a relatively short amount of time.
| SPECIFICATION | HJF-140 |
| A | B | C |
| Screw Diameter | Mm | 38 | 42 | 45 |
| Screw L/D Ration | L/D | 22.1 | 21.6 | 19.5 |
| Shot Size(Theoretical) | cm3 | 193 | 227 | 278 |
| Injection Weight(PS) | g | 176 | 206 | 252 |
| Injection Rate | g/s | 94 | 105 | 135 |
| Injection Pressure | MPa | 205 | 159 | 140 |
| Screw Speed | rpm | 0~220 |
| Clamp tonnage | KN | 1400 |
| Opening stroke | mm | 380 |
| Space Between Tie Bars | mm | 420*420 |
| Max.Mold Height | mm | 450 |
| Min.Mold Height | mm | 170 |
| Ejector Stroke | mm | 120 |
| Ejector Tonnage | KN | 33 |
| Max.Pump Pressure | MPa | 16 |
| Pump Motor Power | KW | 13 |
| Heater power | KW | 7.2 |
| Machine Dimension(L*W*H) | M | 4.5*1.2*1.7 |
| Machine weight | T | 4.2 |
| Oil Tank Capacity | L | 230 |
1.Providing better lubrication and lower lubrication consumption. A
smooth operation leads to longer lifetime of the clamp. Less
maintenance required.
2.Due to new toggle design with optimized kinematics.
Take 200-ton clamping unit for example
Vm: Moving speed of movable platen
Vo: Moving speed of oil cylinder
3.The rigid one-piece injection base supports the common slide rail
for injection and screw movements.
4.Highly optimized servo-hydraulic technology, with improved
efficiency for lower energy consumption.
5.The technologically matured Jupiter II Series convinces not only
with rapid, smooth mold movements and its highly economical energy
consumption. The latest upgrade to the Jupiter - called “Plus” -
has brought significant additional improvements.
6.FOUR SHORT STROKE MOLD BREAK CYLINDERS
For accurate mold height control with closed loop position
feedback, ensures the mold is clamped with parallel movement.
7.HIGHLY RIGID INJECTION UNIT GUIDANCE
with independent movement of the screw drive support.
8.The Hydraulic Units
High efficiency, Energy-saving and high precise proportional
pressure and flow variable displacement pump system make the out of
the hydraulic system matching the required power for entire machine
operation without loss of high pressure throttle and overflow
energy. As comparedwith constant displacement pump, it saves power
by 30%~60%. A motor with same power may be fitted with an oil pump
of bigger displacement and thus accelerates the speed of
machine.Besides, the low oil temperature will prolong the service
life of sealing elements.
Buffer device is used in every mold opening and clamping oil way to
ensure steady mold opening and clamping operation without any
impact.Besides, differential mold clamping operation is fitted to
ensure high production efficiency.
9.The Machine Introduction
The machine use the high-performance servo dynamic control
system,the oil pump as the power source,having the characteristics
as follow:high response,saving energy, low noise, high-control
precision, and have the breakthrough in the prefect connection of
the electrical servo and hydraulic drive system.
