Working principle of injection molding machine what are its characteristics

1. The injection device and the mold locking device are on the same vertical centerline, and the mold is opened and closed along the up and down direction. Its floor area is only about half of that of the horizontal machine. Therefore, the productivity converted into floor area is about twice.

2. Easy to realize insert molding. Because the die surface is upward, it is easy to put the insert into position. If the lower formwork is fixed and the upper formwork is movable, and the belt conveyor is combined with the manipulator, the full-automatic insert molding can be easily realized.

3. The weight of the mold is supported by the horizontal formwork to open and close up and down, which will not happen the phenomenon that the formwork cannot be opened and closed due to the forward fall caused by the gravity of the mold similar to the horizontal machine. It is conducive to maintaining the accuracy of machinery and mold for a long time.

4. The cavity of each plastic part can be taken out by a simple manipulator, which is conducive to precision molding.

5. Generally, the mold locking device is open around, which is easy to configure various automatic devices, and is suitable for the automatic forming of complex and exquisite products.

6. The belt drawing conveying device is easy to be installed in series through the middle of the die, which is convenient to realize automatic molding production.

7. It is easy to ensure the consistency of resin fluidity and mold temperature distribution in the mold.

8. Equipped with rotating table, moving table and inclined table, it is easy to realize insert molding and in mold combined molding.

9. The utility model has the advantages of small size, simple structure and easy unloading during trial production.

10. Having withstood the test of many earthquakes, the vertical machine has better seismic resistance than the horizontal machine due to its low center of gravity.

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Characteristics of vertical injection molding machine

Working principle of injection molding machine

The working principle of the injection molding machine is similar to that of the syringe for injection. It is the process of injecting the plasticized molten plastic (i.e. viscous flow) into the closed mold cavity with the help of the thrust of the screw (or plunger), and obtaining the product after curing and shaping.

Injection molding is a cycle process, each cycle mainly includes: quantitative feeding - melting and plasticization - pressure injection - mold filling and cooling - mold opening and taking parts. After taking out the plastic part, close the mold again for the next cycle.

Injection molding machine operation items: injection molding machine operation items include control keyboard operation, electrical control system operation and hydraulic system operation. Select the injection process action, feeding action, injection pressure, injection speed and ejection type, monitor the temperature of each section of the barrel, and adjust the injection pressure and back pressure.

Generally, the molding process of screw injection molding machine is: first, add granular or powdery plastic into the barrel, and make the plastic melt through the rotation of the screw and the heating of the outer wall of the barrel, then the machine closes the mold and moves the injection seat forward to make the nozzle close to the gate of the mold, and then inject pressure oil into the injection cylinder to push the screw forward, Thus, the molten material is injected into the closed mold with low temperature at a high pressure and fast speed. After a certain time and pressure maintenance (also known as pressure holding) and cooling, the mold can be opened and the product can be taken out (the purpose of pressure holding is to prevent the reverse flow of molten material in the mold cavity, supplement materials to the mold cavity, and ensure that the product has a certain density and dimensional tolerance). The basic requirements of injection molding are plasticization, injection and molding. Plasticization is the premise of realizing and ensuring the quality of molded products. In order to meet the requirements of molding, injection must ensure sufficient pressure and speed. At the same time, due to the high injection pressure, a high pressure is generated in the mold cavity (the average pressure in the mold cavity is generally between 20 ~ 45MPa), so there must be enough clamping force. It can be seen that the injection device and clamping device are the key components of the injection molding machine.

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Working principle of injection molding machine

What can injection molding machines produce

Automobile industry: automobile lamp shell, most automobile interior trim parts, automobile bumper, etc.

Electronics industry: mobile phone shell and some mechanism parts, notebook computer shell, computer monitor shell, mouse, keyboard, USB, etc.

Household appliances: TV shell, washing machine, refrigerator, hair dryer, telephone, power switch, socket, electric kettle handle and base, etc.

Daily necessities: Microwave lunch box, water cup, plastic stool, plastic table, plastic sorting box, plastic flowerpot, plastic dustpan, plastic bowl, plastic basin, plastic toy, water dispenser shell, clothes hanger, etc.

Cosmetics industry: some cosmetics packaging (bottles, lids), etc.

Medical industry: disposable syringe, device for adjusting liquid volume on infusion tube, etc.

Office supplies industry: whiteboard pen, ink pen, ruler, document rack, printer shell, copier shell, fax machine shell, etc.

Most of the plastic things around us are injection molded except for the film and the bottle body with big belly and small mouth, which are made by blow molding, Blister molding or hot pressing molding.