Here complex shape parts can be easily manufactured. This process is very fast and automatically repeated. After removing the part mold is closed again. Then mold is open and some ejectors are used for proper removal of the part without damage. After injection pressure is applied for some time or locked at same position with some force.Īfter the whole process is done the parts manufactured is cooled sufficiently. Injection pressure is generally 100-150 MPa. Pressure applies by the hydraulic system. Molding material goes forward continuously by the rotating screw. Molten plastic material is injected into a closed mold attached on the other side of barrel in this split mold is used.
When powder form of molding material goes dawn into the barrel from hopper it starts melting and a hydraulic ram or rotating screw pushes the material forward into the mold by applying some pressure.
A circumferential heater which is located on the barrel is used to melt the material. After that molding material goes down under the action of gravity into the cylinder (barrel) as shown in diagram. Molding material/ raw material pour into the hopper by feeding device. Working of injection molding similar to extrusion and it works like an injection as name suggest. The life cycle for different material molds are different. Mold is generally made up of copper, aluminum and tool steels. Mold is located inside the mold cavity and a movable pattern is used in whole manufacturing. On the other side of barrel a mold cavity attached. A heating element (heater) is attached to the barrel circumstantially used for melt the molding material comes down from the hopper. A hydraulic ram or rotating screw runs by electric motor used of providing force is located inside the barrel. A hopper is located at one end of the barrel. Injection molding machine consists of a barrel (cylindrical pipe). Generally injection molding machines works in horizontal manner. The main parts of the Injection molding machine are material hopper, barrel, an injection ram/ rotating screw type plunger, heating device (heater), movable pattern, ejectors, and a mold inside mold cavity. Injection Molding: Main parts of Injection Molding Machine: This process is done by heating of raw material and injecting them into the mold cavity by applying pressure at a specific temperature without any change in their chemical composition. In die casting we use metals which require extremely high temperature for melting but injection molding is mainly done on glasses, elastomers and most commonly thermoplastic and thermosetting polymers but this technique is widely used for fabrication of thermoplastic materials. It is little bit similar to die casting but the difference is in raw material used. Injection molding is an important industrial method. Injection Molding Machine : Construction, Working, Application, Advantages and Disadvantages
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