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Understand the injection molding machine

Class：Company News
Author：Administrator
From：Ningbo Shuangke Plastic Machinery Manchinery Co.,Ltd
Time：2022-04-10 14:39:34
Hits：159

Understand the injection molding machine

Injection molding machine is also called injection molding machine or injection machine.It is the main molding equipment for making thermoplastic or thermosetting plastic by using plastic molding mold to make plastic products of various shapes.Divided into vertical type, horizontal type, all-electric type.The injection machine can heat the plastic and apply high pressure to the molten plastic to make it shoot out and fill the mold cavity.The working principle of the injection molding machine is similar to that of the syringe for injection. It is the process of injecting the thrust of the screw (or plunger) into the closed cavity of the mold after the injection.Injection molding is a cycle process, each cycle mainly includes: quantitative feeding-melting molding-pressure injection-charging cooling-molding.Remove the plastic parts and then close the mold, for the next cycle.Injection machine operation items: injection machine operation items include control keyboard operation, electrical control system operation and hydraulic system operation.The selection of injection process action, feeding action, injection pressure, injection speed, top-out type, temperature monitoring of each section of the material cylinder, injection pressure and back pressure pressure adjustment, etc.The molding process of general screw injection molding machine is: first, add grain or powder plastic into the cylinder, And through the rotation of the screw and the outer wall of the cylinder, The machine then moves the mold closing and the injection seat forward, Stick the nozzle to the mouth of the mold, Then pour the pressure oil into the injection cylinder, Push the screw forward, Thus injecting the melt into a cooler closed mold at high pressure and high speed, After a certain period of time and pressure maintenance (also known as pressure retention), cooling, Make it by curing and forming, Products can be removed from the mold (the purpose of pressure preservation is to prevent the reflux of the melt in the mold cavity, to supplement the material to the mold cavity, And to ensure that the products have a certain density and size tolerance).The basic requirements for injection molding are plasticizing, injection, and molding.Plasticity is the premise to realize and guarantee the quality of molding products, and in order to meet the requirements of molding, the injection must ensure sufficient pressure and speed.At the same time, because the injection pressure is very high, the correspondingly high pressure in the mold cavity (the average pressure in the mold cavity is generally between 20 and 45 M P a), so there must be a large enough molding force.It shows that the injection device and the molding device are the key components of the injection molding machine.The uation of plastic products mainly has three aspects: the first is the appearance quality, including integrity, color, luster, etc.; the second is the accuracy between size and relative position; the third is the physical properties, chemical properties, electrical properties corresponding to the use.These quality requirements and according to the use of products, the scale is also different.The defects of products mainly lie in the mold design, manufacturing precision and wear degree.But in fact, the technicians of plastic processing plants often suffer from the difficulty of using technology to make up for the problems caused by the mold defects and achieve little results.The regulation of the process in the production process is a necessary way to improve the quality and output of the products.Because the injection molding cycle itself is very short, if the process conditions are not well mastered, the waste will be endless.When adjusting the process, it is best to change only one condition at a time, observe several times, if the pressure, temperature, time are all adjusted together, it is easy to cause mixing