ࡱ> kmj[ bjbj k,ΐΐFF$$!& !!!!!!!$G#%@!@!U!!!rT ЕX. !k!0!< u&.u& u& ,@!@!!u&F O: PNEUMATIC INJECTION MOULDING MACHINE SYNOPSIS The aim of our project is to DESIGN AND FABRICATE A PNEUMATIC INJECTION MOULDING MACHINE. The project deals about the injection-moulding machine. The main principle is to compress the plastic material in a barrel and pneumatic loading develops the compressing motion. The pneumatic circuit consists of a compressor, air tank, control valves and a cylinder. The compressor gives power to the system. The control valves controls the Air flow in the system. According to the valve position the piston moves downwards and upwards. The plastic materials are poured in a barrel. The heater surrounding the barrel heats the plastic material. Then it is converted into molten state. The molten plastic is injected through the nozzle in a barrel to the die by the compressing force. The die is placed just below the nozzle. After completing the process, we will get the product from the die. Different shape of the component can be made according to the die what are used. Commercial product like bushes, couplings, switches etc. can be produced. INTRODUCTION The main principle is to compress the plastic material in a barrel and the compressing motion is developed by hydraulic motion. The heater surrounding the barrel the molten plastic is injected through the nozzle in barrel to the compressing force heats the plastic material. FABRICATION TECHNIQUES: The polymer material are converted in to plastics and used as tubes, sheets, foams, rods, adhesives etc. The theological properties, softening, tempering, stabilizing the size and shapes are important in describing the method. These methods are different for different kinds of plastics. Broadly speaking the methods may be discussed under the following headings. MOULDING PROCESS. FOAMING PROCESS. WORKING PRINCIPLE The Pneumatic injection-moulding process is best suited for producing articles made of thermoplastic materials. Here, the equipment cost is relatively high but the main attraction is the amenability of the pneumatic injection-moulding process to a high production rate. In pneumatic injection molding, a definite quantity of molten thermoplastic material is injected under pressure into a relatively cold mold where it solidifies to the shape of the mould. The pneumatic injection moulding machine is shown in the process consists of feeding the compounded plastic material as granules, pellets or powder through the hopper at definite time intervals into the hot molten plastics. Pressure is applied through a pneumatically driven piston to push the molten material through a barrel into a mould fitted at the bellow the nozzle. The molten plastic material from the Hooper is then injected through a nozzle material. The mould used, in its simplest form, is a two-part system. One is a movable part and the other stationary. The stationary part is fixed to the end of the cylinder while the movable part can be opened or locked on to the stationary part. By using a mechanical locking device, the mould is proper held in position as the molten plastic material is injected under a pressure as high as 1500kg/cm. The locking device has to be very skillfully designed in order to withstand high operating pressures. Further more, a proper flow of the molten material to the interior regions of the mold is achieved by preheating the mould to an appropriate temperature. Usually, this temperature is slightly lower than the softening temperature of the plastic material under going moulding. After the mould is filled with the molten material under pressure, then it is cooled by cold water circulation and then opened so as to eject the molded article. The whole cycle could be repeated several times by the same procedure. The double acting pneumatic cylinder is used to inject the molten plastic material into the die. The flow control valve is used to control the flow of air in to the cylinder. The direction control valve is used to control the direction of piston movement. These all valves are already explained in the above chapter. ADVANTAGES This product is an alternative for plastic cups and plates. Cheaper and easily available material is used. The pneumatic arm is more efficient in the technical field. Quick response is achieved Simple in construction. Easy to maintain and repair. Cost of the unit is less when compared other moulding machine. No fire hazard problem due to over loading. Comparatively the operation cost is less. Continuous operation is possible without stopping. It reduces the manual work. It reduces the production time. Occupies less floor space. Less skilled operator is sufficient. Different shape of the components can be made according to the die what are used. Adjustable Temperature setting is done with the help of thermo stator. APPLICATIONS The daily using plastic components can be easily made. It is very useful in small scale moulding industry Textile products can be produced. By changing proper die, we can produce any shape of plastic materials with low cost. 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