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The working principle of the zipper machine is similar to that of a syringe for injection. It uses the thrust of the screw (or plunger) to inject the plasticized plastic in the molten state (that is, the viscous state) into the closed mold cavity. Inside, the process of obtaining products after curing and shaping. Injection molding is a cycle process, each cycle mainly includes: quantitative feeding - melt plasticization - pressure injection - mold filling and cooling - mold opening and drawing. After the plastic part is pulled out, the mold is closed again for the next cycle. Zipper mechanical operation project: The zipper mechanical operation project includes three aspects: control keyboard operation, electrical control system operation and hydraulic system operation. The selection of injection process action, feeding action, injection pressure, injection speed, ejection type, temperature monitoring of each section of the barrel, adjustment of injection pressure and back pressure, etc. are carried out respectively. The molding process of the general screw zipper machine is as follows: first, the granular or powdery plastic is added to the barrel, and the plastic is melted by the rotation of the screw and the heating of the outer wall of the barrel, and then the machine is clamped and the injection seat is moved forward, Make the nozzle close to the gate of the mold, and then inject pressure oil into the injection cylinder to advance the screw, so that the molten material is injected into the closed mold with low temperature at a high pressure and a fast speed. Time and pressure are maintained (also known as pressure holding), cooled to solidify and form, and then the mold can be opened and the product can be taken out (the purpose of pressure holding is to prevent the backflow of the molten material in the mold cavity, replenish the material into the mold cavity, and ensure the product. with certain density and dimensional tolerances). The basic requirements of injection molding are plasticizing, injection and molding. Plasticization is the premise to realize and ensure the quality of molded products, and in order to meet the requirements of molding, injection must ensure sufficient pressure and speed. This article is from City Machinery Co., Ltd., please indicate the source for reprinting:
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