Ningbo haijiang machinery manufacturing co.,Ltd
Haijia Injection Machine,Energy Saving More
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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 Upon reaching this point, the screw is withdrawn, the mold opened, and the part ejected.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 | ||
■ The Clamping Parts
The new generation mold locking device and computer emulation optimized parameter makes motions of the moving plate, fixed plate and high rigidity toggle structure, the characteristic of high strength and anti-fatigue is secured. As compared with similar machines, it owns bigger internal spur between tie bars, mold space and mold opening stroke and may process plastic products of bigger size.
■ The Injection Units
Short and forceful double-cylinder injection system is used to ensure the steady injection motion.The strain free fixed mold plate and screw assembly with optimized design help to reach better plasticing capacity and effect. PID temperature control regulate the speed and pressure of injection, pressure keeping, smelting, back pressure and other motions to ensure the quality of formed products and continuation of production.Auto material preparation, drooling proof,and anti cold start lapse functions ensure the high efficent,simple and safe operations.
■ 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, t 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.
