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13905809167

Wang Jiaming (Manager)

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0580-8231369
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13905809167
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Working principle and technology of injection molding machine

Read: 6777 Release time: 4/24/2014

The following analyzes the working principle and process of the injection molding machine from five aspects:

1. The working principle of injection molding machine: Similar to the injection syringe, it uses the thrust of the screw (or plunger) to inject the plasticized molten state (ie, viscous fluid state) into the closed mold cavity Inside, the process of obtaining products after curing and setting.

2. Injection molding is a cyclic process, and each cycle mainly includes: quantitative feeding-melt plasticization-pressure injection-filling cooling-opening and taking parts. After removing the plastic part, the mold is closed and the next cycle is performed.

3. Injection molding machine operation items: Injection molding machine operation items include control keyboard operation, electrical control system operation, and hydraulic system operation. The injection process action, feeding action, injection pressure, injection speed, ejection type selection, temperature monitoring of each section of the barrel, and adjustment of injection pressure and back pressure are performed separately.

4. The molding process of a general screw injection molding machine is: firstly add granular or powdery plastic into the barrel, and then turn the screw and the outer wall of the barrel to make the plastic into a molten state, and then the machine performs mold clamping and injection Move, make the nozzle close to the gate of the mold, and then pass pressure oil into the injection cylinder to advance the screw, so that the melt is injected into the closed mold with a lower temperature at a higher pressure and faster speed. After a certain period of time and pressure is maintained (also known as holding pressure) and cooling to solidify and mold, the product can be opened to remove the mold (the purpose of holding pressure is to prevent the backflow of the melt in the mold cavity, replenish the material into the mold cavity, and Ensure that the product has a certain density and dimensional tolerance). The basic requirements for injection molding are plasticization, injection and molding. Plasticization is a prerequisite for achieving and guaranteeing the quality of molded products. To meet the requirements of molding, injection must ensure sufficient pressure and speed. Simultaneously,

Due to the high injection pressure, a correspondingly high pressure is generated in the mold cavity (the average pressure in the mold cavity is generally between 20 and 45 MPa), so it must have a sufficient clamping force. It can be seen that the injection device and the mold clamping device are the key components of the injection molding machine.

5. The evaluation of plastic products mainly has three aspects: * is the appearance quality, including integrity, color, gloss, etc .; the second is the accuracy between size and relative position; the third is the physical and chemical properties corresponding to the use , Electrical performance, etc. These quality requirements are also different according to the product's use occasions. The defects of products are mainly in the aspects of mold design, manufacturing accuracy and degree of wear. But in fact, the technicians in the plastic processing plant are often struggling to face the difficult situation that the process means to make up for the problems caused by the defects of the mold is not effective.

Zhoushan Jiaming Machinery Co., Ltd. Main Products: Zhoushan Screw, Rubber Extruder Screw Barrel, Injection Mold Screw Barrel Address: No. 24 Dafeng Road, Xiqiao Industrial Zone, Jintang Town, Dinghai District, Zhoushan City, Zhejiang Province 0580-8231369 Mobile: 13905809167 Fax: 0580-8233517
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