The working principle of injection molding machine and injection syringe with similar, it is the use of screw (or piston) thrust, the plasticizing good molten state (i.e. viscous flow) plastic injected into the mold cavity closed good after curing stereotypes made the process of the products.
Injection molding is a cycle process, each cycle mainly includes: quantitative feeding - melt plasticizing - pressure injection - mold cooling - die opening pieces. Take out the plastic parts and then close the die 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 three aspects. The injection process action, feeding action, injection pressure, injection speed, ejection type selection, temperature monitoring of each section of the barrel, adjustment of injection pressure and back pressure are carried out respectively.
The molding process of the general screw injection machine is first granular or powdered plastic into the machine barrel and then through the rotation of the screw and barrel wall heating the plastic as molten state, then the machine mold and the injection seat moves forward, to close the mold gate nozzle, the pressure oil through to the injection cylinder then, the screw to move forward at a high pressure and speed will melt into the closed mold temperature low, after a certain period of time and pressure (also called pressure), cooling, the curing, can remove mold products (pressure to prevent molten material the reflux, supplementary materials, to ensure the products with the mold cavity and the density and size tolerance in a certain cavity). The basic requirements of injection molding are plasticization, injection and molding. Plasticizing is the prerequisite to realize and guarantee the quality of molding products, and 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, the corresponding high pressure is produced in the cavity (the average pressure in the cavity is generally between 20~45MPa), so it is necessary to have enough clamping force. Thus, the injection device and clamping device are the key components of the injection molding machine.
The evaluation of plastic products mainly has three aspects, the first is the appearance of quality, including integrity, color and luster; second is between the size and relative position accuracy; the third is to use the corresponding physical properties and chemical properties, electrical properties etc.. These quality requirements are also different according to the occasion of the use of products. The defects of the product mainly lie in the design of the die, the manufacturing accuracy and the wear degree. But in fact, the technical personnel of the plastic processing factory often suffer from the difficult situation which is not effective with the technical means to make up for the defects caused by the mold defects.
The adjustment of process is the necessary way to improve the quality and output of products. Injectioncycle is very short, if the process conditions is not well controlled, the waste will be endless. In the process of adjustment, it is best to change only one condition at a time, observe more than a few times, if the pressure, temperature, time all together tune, it is easy to cause confusion and misunderstanding, the problem also don't know what is the reason. The measures and means to adjust the process are various. For example: to solve the problem of product dissatisfaction, there are more than 10 possible solutions, to choose the one or two major solutions to solve the crux of the problem, in order to truly solve the problem. In addition, attention should be paid to the dialectical relationship in the solution. For example: products appear depression, sometimes to improve the material temperature, and sometimes to reduce the material temperature; sometimes to increase the amount of material, sometimes to reduce the amount of material. The feasibility of solving the problem of reverse measures should be acknowledged.
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