Please Give The Following Advantages To Choose The Screw Barrel Of Injection Molding Machine
Please give the following advantages to choose the Screw Barrel of injection molding machine
Section description of Screw Barrel for injection molding machine
The injection molding machine screw barrel generally can be divided into the feeding section, the compression section, the homogenization segment (also known as the metering section). (note: the ratio of the three segments of the screw is different, the screw groove is different, and the diameter of the screw is different.)
(1) the feeding section indicates that this segment of spiral groove is fixed in depth, and its function is to be responsible for preheating and plastic solid conveying and pushing. It is necessary to ensure that the plastic begins to melt at the end of the feeding segment.
(2) description of compression section: this section is a tapered Screw Barrel tooth depth, its function is plastic material melting, mixing, shear compression and pressure exhaust. The plastic will dissolve completely in this segment, the volume will shrink, and the design of the compression ratio is important.
(3) the homogenization section: this section for screw fixed screw groove groove depth, its main function is mixed, melt conveying, metering, must also provide enough pressure, maintain stability of the melt temperature and the flow of the molten plastic.
Injection molding machine screw barrel function
Screw is an important part of injection molding machine. It is used to transport, compaction, melt, stir and press the plastic. All of these are accomplished through the rotation of the screw in the cylinder. When the screw is rotated, the plastic can produce friction and movement between the inner wall of the cylinder, the bottom of the screw, the screw edge, and the plastic and plastic. The moving forward of plastic is the result of this combination, and the heat generated by friction is also absorbed to raise plastic temperature and melt plastic. The design structure of the screw will directly affect the degree of these effects.
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Screw barrel forming process is: first, Screw Barrel add the granular or powdered plastic barrel, and with the rotation of the screw and barrel outer wall heating make plastic molten state, then the machine forward, clamping and injection nozzle with mold gate way, then to the injection cylinder pressure oil of our factory, make the screw to move forward, thus at high pressure and fast speed will be within the closed mold injection melting temperature is low, after a certain time and pressure maintenance (also known as the holding), cooling, make its curing, can open mold to take out the products (the holding of the purpose is to prevent cavity in the reverse flow of the molten material, supplementary material within the cavity, and ensure that products have a certain density and size tolerance).
The basic requirements of injection molding are plasticization, injection and molding. Plasticization is the prerequisite to realize and guarantee the quality of molding products. In order to meet the requirement of molding, injection must ensure sufficient pressure and speed. At the same time, due to high injection pressure, high pressure is generated in the mold cavity (the average pressure in the cavity is generally between 20 ~ 45MPa), so there must be a large enough force. Therefore, the injection device and the mould device are the key parts of the injection molding machine.