Differential-pressure vacuum injection molding technique

Abstract

The invention relates to a differential pressure vacuum injection molding process, which includes the steps of preparing two constituent materials, mixing, stirring, injecting, and heating for solidification. During the process of mixing and stirring the two constituent materials, circulating air admission for de-foaming is performed continuously, i.e. the vacuumizing process to eliminate the foams in the mixed constituent materials to avoid producing defective products; when injecting the evenly mixed constituent materials, the filling of the evenly mixed constituent materials is accelerated by the pressure difference between a stirring chamber and an injecting chamber; when the mixed constituent materials overflow all air outlets, the stirring chamber and the injecting chamber quickly reach a pressure balance to prevent too many mixed constituent materials from overflowing. The injection molding process is suitable for producing compact, thin-walled, transparent and meshed plastic parts with few or no air holes and complicated shapes.

Description

Technical field: [0001] The invention relates to a process method of differential pressure injection molding in a vacuum environment, which is suitable for manufacturing plastic parts such as thin-walled, transparent, mesh and complex shapes. Background technique: [0002] In the field of rapid design and manufacturing, with the increasingly fierce market competition, the requirements for new product development are getting higher and higher, and enterprises have higher and higher requirements for rapid tooling methods for new products. The current rapid tooling method can no longer adapt to such changes and requirements, especially the existing vacuum injection molding process, which is likely to cause high scrap rates of plastic parts such as thin-walled, transparent, mesh and complex shapes. In order to improve the injection molding quality of such parts in a vacuum environment and reduce the reject rate caused by air bubbles or insufficient filling, it is necessary to us...

AI Technical Summary

Problems solved by technology

The current rapid mold method can no longer adapt to such changes and requirements, especially the existing vacuum injection molding process, which is likely to cause high scrap rates of plastic parts such as thin-walled, transparent, mesh and complex shapes.

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