Injection moulding process and mould for precision and minitype plastic piece

Abstract

The invention discloses an injection moulding process and mould for a precision and minitype plastic piece. The technological process adopting the mould comprises the following steps: firstly, a material flow flows into a main channel from a main pouring gate, then flows into sub channels, flows from the end part of each sub channel through a secondary pouring gate in a perpendicular manner to a center confluence opening corresponding to sub channel group, and then flows into a cavity of each plastic piece. During injecting moulding, the material flow flows through the sub channel, particularly passes through the secondary pouring gates and flows into the center confluence opening of the sub channel group in a perpendicular manner, so that the material flow which flows into the center confluence opening can spread out uniformly and flows into the sub channel groups uniformly; the material flows can finally reach and fill every cavity of the plastic pieces uniformly and simultaneously, so that the cavity of each plastic piece has excellent welding trace jointing strength, the impact resistance of the plastic piece is improved, the uniformity of the product size is improved, the product yield is high, and the product performance is better.

Description

technical field [0001] The invention relates to the technical field of injection molding of plastic parts, in particular to an injection molding process and mold for precision small plastic parts. Background technique [0002] Precision small plastic products (such as small buttons) are molded by injection molding. In addition to requiring high dimensional accuracy and good uniformity of multiple cavities in the same mold, they also need to have mechanical properties such as high strength and impact resistance. Injection molding process and mold are inseparable. At present, the injection molding process and mold are as follows: the material flow enters the main channel from the main gate, then divides into each runner, and then horizontally divides into several branches located in the same plane and surrounded by the ends of each runner, and finally flows into In the cavity of the plastic part at the end of each branch. Plastic parts and waste obtained after injection mold...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an injection molding process and mold for precision small plastic parts, which overcomes the problems of insufficient seam strength, poor impact resistance, and uneven quality of plastic parts obtained in the prior art.

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