On the control of plastic injection molding machine
The injection molding machine is a kind of plastic machinery, referred to as the injection molding machine or injection molding machine, thermoplastic or thermosetting material the use of plastic mold into various shapes of plastics molding equipment. Injection molding by the injection molding machine and mold.
Type
The type of injection molding machine: vertical, horizontal, all-electric, but no matter the kind of injection molding machines, the basic functions of two (1) heating plastic to reach the molten state (2) to exert high pressure on the molten plastic. it shot full of mold cavity.
Working principle and mode of
The working principle of injection molding machine and injection syringe, it is with the thrust of the screw (or plunger), the plasticizing good molten state (ie, viscous flow state), the plastic injected into the mold cavity closed good After curing stereotypes made the process of the products. Injection molding is a cyclical process, with each cycle including: dosing - molten plastics - to put pressure injection - filling Cooling - Kai-mode pickup. Remove the plastic parts and then re-closed mode, the next cycle. Injection molding machine operating items: injection molding machine operating projects including the control keyboard operation, the operation of electrical control system and hydraulic systems operating in three aspects. Separate action of the injection process, feeding action, injection pressure, injection speed, the top choice of the type, barrel temperature of each monitor, injection pressure and back pressure regulation. Screw injection molding machine molding process: First, granular or powdered plastic in the machine barrel, through which the screw rotates and the outer wall of the barrel, heating the plastic to become molten state, then the machine before clamping and injection shift, so that the nozzle closely aligns the mold gate Road, then the oil pressure to the injection cylinder Walter, screw forward to high pressure and a faster speed will melt into the closed mold temperature is low , after a certain period of time and pressure to keep (also known as pressure), cooling, curing, the mold can be opened to remove the products (the purpose of holding pressure to prevent the reflux of the melt in the mold cavity, supplementary material to the mold cavity, and to ensure that products have a certain density and dimensional tolerances). The basic requirements of the injection molded plastics, injection and molding. The plasticizing premise to achieve and guarantee the quality of the molded part, to meet the requirements of forming, injection must ensure there is enough pressure and speed. The same time, due to the high injection pressure, the corresponding cavity to produce a high pressure (average pressure of the cavity is generally between 20 ~ 45MPa), so there must be large enough clamping force. Thus, the injection unit and clamping devices are key components of the injection molding machine. Mainly in three aspects of the evaluation of plastic products, and the first appearance of quality, integrity, color, luster; the second is between the size and relative position accuracy; the third is to use the corresponding physical properties, chemical properties, electrical properties. These quality requirements are also different according to the different products using the occasion to require the scale. Defects of products is that the mold design, manufacturing precision and wear. In fact, the technical staff of the plastic processing plants often suffer from the face of technology means to compensate for the problems brought about by the mold defects but not the effectiveness of a difficult situation. Regulation of technology in the production process is the essential way to improve product quality and yield. Injection cycle is very short, if the process conditions are handled badly, the waste will be an endless supply. Adjustment process when the best time to change a condition to observe a few times, pressure, temperature, time, all with the tone, it could easily lead to confusion and misunderstanding, a problem do not know what reason. Measures to adjust the process, means, in many ways. Example: solving products Note dissatisfaction there is more than a dozen possible solutions to choose to address the crux of the problem, two major programs, in order to really solve the problem. In addition, attention should be paid to the dialectical relationship between the solution. Such as: products the depression, sometimes to raise the melt temperature, sometimes to reduce the melt temperature; sometimes to increase the quantity, and sometimes to reduce the feeding amount. To recognize the reverse feasibility of measures to solve the problem.
Classification and characteristics
Injection molding machine in accordance with the arrangement of the injection unit and clamping devices can be divided into vertical, horizontal and vertical and horizontal composite. Its own characteristics as follows: (a) the characteristics of vertical injection molding machine: 1, the injection unit and clamping devices in the same vertical center line, and the mold opening and closing along the upper and lower direction. Its covers an area of only about half of the horizontal plane, therefore, converted into an area of production around about twice. 2, easy to insert molding. Mold surface facing up, insert into the positioning easy. Using fixed under the template, the template movable machine, pull the belt conveyor, then a combination of plant and machinery palmistry can easily implement automatic insert molding. 3, the weight of the mold level template support for up and down the opening and closing movements, similar to the horizontal plane not occur before mold gravity down, making the template can not
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