Injection molding machine hydraulic system
Injection molding machine
Injection molding machine The injection molding machine is a kind of plastic machinery referred to as theinjection 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.The plastic casts shaper is one kind of heating up the plastic the plasticizing, pours into with the aid of the advancement organization the melting plastic in the mold cavity, after cooling, the stereotypia forms the product the plastic to take shape the processing equipment. It can dispose the different mold, but time takes shape the contour complex product, is in the plastic machinery one of main aircraft types. The plastic injection takes shape already has very many forms. The hydraulic pressure type plastic injection shaper is one of them, it mainly has gathers the mold organization, injects the part, the hydraulic transmission and the plastic casts shaper is one kind of heating up the plastic the plasticizing, pours into with the aid of the advancement organization the melting plastic in the mold cavity, after cooling, the stereotypia forms the product the plastic to take shape the processing equipment. It can dispose the different mold, but time takes shape the contour complex product, is in the plastic machinery one of
main aircraft types. The plastic injection takes shape already has very many forms. The hydraulic pressure type plastic injection shaper is one of them, it mainly has gathers the mold organization, injects the part, the hydraulic transmission and the electricity control system and so on several parts of compositions, but the hydraulic pump, the hydraulic cylinder, each kind of hydraulic valve, the electrical machinery, the electrical part as well as the control measuring appliance are indispensable control part.
Three major components of
(1) clamping components. It is a molded member installation Die. Mainly by fixed templates, dynamic templates clamping mechanism, clamping hydraulic cylinder, ejector device.
(2) injection member. It is a plastics injection molding machine member. Mainly by the feeding device and barrel, screw, nozzle, top plastic device, the injection of hydraulic cylinders, injection seat and its mobile hydraulic cylinders and other components.
(3) hydraulic transmission and electrical control systems installed in the fuselage on the inside and outside the chamber, is the driving force of the injection molding machine and manipulating the control unit. Mainly composed of hydraulic pumps, hydraulic valves, motors, electrical components, and control instruments.
SZ-250A type plastic injection molding machine are small injection molding machine. Each maximum injection capacity of 250 g. Basis for the plastic injection molding process, injection molding machine hydraulic drive system should meet the following requirements:
(1) the mold clamping hydraulic cylinder having a sufficiently large clamping force, and its operating speed can be based on the requirements of the the clamping and Kai mold process varies.
In the injection process, the molten plastic is often injected into the cavity to a high voltage of 4 ~ 15 MPa. Thus, the requirements of the mold clamping mechanism having a sufficiently large clamping force, and to ensure that the movable platen and the stationary platen closely bonded. Otherwise, the mold away from the seam will produce the the overflow edges phenomenon of plastic products. To this end, without making the size of the mold clamping hydraulic cylinder is too large, and the pressure is too high, often using the mechanical linkage force increasing mechanism to achieve the clamping and clamping.
In order to shorten the time of air travel, improve productivity, clamping hydraulic cylinder should be fast-moving action template. However, in order to prevent damage to the mold and products, avoid machine subject to strong vibration and impact-generated noise, but also consider the buffer of mold opening and closing process. Accordingly, the hydraulic cylinder in the mold opening and closing process, the speed of each stage is not the same.
Usually slow—fast—slow process of change faster, and fast slow changes. (2) injection seat overall movement (forward or backward). Forward with sufficient thrust to ensure that the nozzle is brought into close contact with the mold gate. Further, it should be able to feed at a fixed feed, before feeding, and after three different preform its action to be adjusted.
(3) the pressure and velocity of injection should be capable of adjustment, in order to meet the raw material, different the article geometry and layout of the mold gate and so the size of the injection force requirements, as well as the requirements of the different products on the injection speed. (4) melt into the cavity after the pressure keeping the cooling, when the cooling and solidification, should be able to cavity supplemental condensing shrinkage desired melt.
In order to shorten the time of air travel, improve productivity, clamping hydraulic cylinder should be fast-moving action template. However, in order to prevent damage to the mold and products, avoid machine subject to strong vibration and impact-generated noise, but also consider the buffer of mold opening and closing process. Accordingly, the hydraulic cylinder in the mold opening and closing process, the speed of each stage is not the same. Usually slow—fast—slow process of change faster, and fast slow changes. (5) the pre-molding process can be adjusted. Solidification stage cooling of the melt in the cavity, the plastic particles within the hopper by rotary screw barrel embroiled barrel, and goes on to the nozzle direction
continuously. While heating plasticizing, stirring and extruded into the melt. Typically, called the weight of the barrel hourly plasticizing plasticizing capacity, as indicators of the production capacity of the injection molding machine. Premise barrel size to determine the the plasticizing capacity with screw speed. Accordingly, as the plastic melting point, fluidity, and the different products, the screw speed should be adjustable in order to adjust the plasticizing capacity.
(6) the top of the cylinder speed is adjustable. Products during the cooling after molding, demolding the ejector, in order to prevent product damage, requiring top of the smooth motion, and the speed of the top of the cylinder should be able, depending on the product shape which can be adjusted.
Working Principle
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
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