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The Description of injection molding

The Description of injection molding
Issue Time:2018-10-11
The Description of injection molding

Injection moulding is a manufacturing process for producing parts by injecting molten material into a mould. 

Injection moulding can be performed with a host of materials mainly including metals, (for which the process is called die-casting), glasses, elastomers, confections, and most commonly thermoplastic and thermosetting polymers. Material for the part is fed into a heated barrel, mixed (Using a helical shaped screw), and injected (Forced) into a mould cavity, where it cools and hardens to the configuration of the cavity.[1]:240 After a product is designed, usually by an industrial designer or an engineer, moulds are made by a mould-maker (or toolmaker) from metal, usually either steel or aluminium, and precision-machined to form the features of the desired part. Injection moulding is widely used for manufacturing a variety of parts, from the smallest components to entire body panels of cars. Advances in 3D printing technology, using photopolymers which do not melt during the injection moulding of some lower temperature thermoplastics, can be used for some simple injection moulds.

Eight Steps to Perfect Parts

The plastic injection molding process can be summarized into eight steps:

1.The part is designed, and prototypes are created and tested.
2.A durable steel or aluminum mold (or tool) is designed and built. This process takes several weeks and includes a lot of complicated systems to control the process.
3.In production, raw material is loaded into a “feed hopper.”
4.The material is fed into a heated “barrel” where it becomes viscous—a state somewhere between solid and liquid.
5.The viscous material is forced by a plunger into a mold, which is held shut by hydraulics to withstand the pressure of the incoming material.
6.The material cools quickly in the mold and is ejected as a finished part after a predetermined time.
7.Quality assurance checks are performed on the part.
8.Meanwhile, the mold is closed again in preparation for the next processing cycle. 

Everything from colors and textures, to lettering, logos, and designs, to hinges and other functionality can be incorporated into the creation of a plastic part.