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Injection Molding

Injection molding is a manufacturing process that produces products by re-injecting molted raw material pellets into a mold. Unlike Vacuum Forming, one of the raw materials used in vacuum forming is a piece of plastic sheet that has been melted and extruded. However, injection molding can be done with many different materials, such as metals, glass, elastomers, candy, and most commonly thermoplastic and thermoset polymers. The process of injection molding involves pellets of raw plastic materials being fed into a heated barrel, mixed and melted, and injected into a mold cavity where it cools and hardens to the configuration of the mold cavity before being demolded. In general, our molds are basically made using aluminum or steel, which are precision machined to form the desired plastic part. The products made by injection molding are quite precise in their dimensions and can be made in a wide range of sizes, from insignificant finger-sized products to the entire body panels of a car.

Raw Material In Injection Molding

       The injection molding process is to directly melt the plastic raw material particles after the screw is thrust, injection into the mold commonly used injection materials are ABS, PP, PC, PMMA, PE, TPU, PE, PCTG, etc.

Mold For Injection Molding

       Molds used for injection molding usually go through two main steps, one of which is CNC processing and the other is EDM machine Processing. The use of CNC processing accuracy alone is not sufficient for injection molding. But using EDM machines can meet the need. Firstly, EDM machines are virtually unaffected by heat in the process, thus reducing the heat-affected layer and the high quality of the machined part. Secondly, in the low-speed wire is constantly updated, which is conducive to improving the processing accuracy and reducing surface roughness. Then it can cut a narrow slit of about 0.05mm and the cutting efficiency that EDM wire cutting can achieve is generally 20~60mm 2/min, up to 300mm 2/min; the processing accuracy is generally ±0.01~±0.02 mm, up to ±0.004 mm; the surface roughness is generally R2.5~1.25 micron, up to Rα0.63 micron; the cutting thickness is generally 40~60mm, the thickest can reach 600mm. Finally, EDM processing can achieve the vertical corner of the workpiece; this is the milling process can not be achieved because the milling process is bound to have the R angle exists.

An Injection Molding Processing
How We Mold The Injection Mold

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