1. Prehardened steel:
Does not last as many cycles as hardened steel, and is less
expensive to create.
Aluminum: Most commonly used for single cavity "Prototype Tooling"
when a relatively low number of parts are needed for testing. Once
the injection molded parts from this tool are tested and approved,
then a multi cavity steel production tool is produced. It is
possible to get many thousands of parts from an aluminum tool but
typically it is used for lower quantities.
Beryllium-Copper alloy: Typically used in areas of the mold that
need fast heat removal or where shear heat is concentrated.
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:
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 |
2. Injection Unit Features
2.1 Injection unit adopts duble-cylinder design, more higher
injection pressure, more simpler structure and lower malfunction
rate.
2.2 Enlarged-cylinder, adopting two -cylinder design,effectively
prevent the adhesive-material leaking phenomenon because of the
machine vibration or other reasons when the nozzle is under
high-speed operation.
2.3 Adopting graphite bush, improving the wear-resistance, reducing
the frequency of using lubrication oil effectively improve the
cleanness of the injection part.
2.4 Injection cylinder adopts low-frictional seals, improving the
response rate and improve the stability under the complicated
processes of injection.
2.5 Bridge-style design, for different L/D plastic parts.