Ejection structure of low-pressure injection molding mold

Abstract

The invention relates to the field of injection molds, in particular to an ejection structure of a low-pressure injection molding mold. The low-pressure injection molding mold comprises a second male mold plate, a second ejector plate and a second lower fixing plate. The ejection structure comprises a guide column and an elastic piece, wherein the guide column is vertically arranged at the top of the second lower fixing plate, and a first through hole through which the guide column can pass is formed in the second ejector plate; and the resilience force of the elastic piece is larger than the injection molding pressure and smaller than the mold closing force. In the compression stage, the second male mold plate abuts against the guide column, the second ejector plate abuts against the elastic piece, and the elastic piece is in a compressed state; and in the injection molding stage, the second male mold plate abuts against the guide column, the second ejector plate abuts against the elastic piece, and the elastic piece is in a rebound state. The ejection structure with a novel stacked spring is applied to the low-pressure injection molding mold, and replaces an oil cylinder to complete the pre-pressing ejection action, oil leakage is avoided as the oil cylinder is omitted, and pressure maintaining and maintenance are not needed.

Description

technical field [0001] The invention relates to the field of injection molds, in particular to an ejection structure of a low-pressure injection molding mold. Background technique [0002] Products corresponding to large PC transparent parts need low-pressure injection molding due to the uncontrollable warpage and deformation during the injection molding process, and the appearance is prone to defects such as shrinkage, flow marks, and weld lines. Compared with traditional injection molding, low-pressure injection molding has the following advantages: [0003] 1. The number of gates is small, and the trimming cost is low; [0004] 2. The warping deformation of the product is small; [0005] 3. The appearance and wall thickness of the product are uniform; [0006] 4. The surface of the product has no shrinkage, no flow marks, and no weld lines; [0007] 5. The injection pressure is small, and the internal stress of the product is small. [0008] The mold opening sequence...

AI Technical Summary

Problems solved by technology

from figure 2 It can be seen from the figure that there are a lot of oil circuits connected to the mold, oil leakage problems often occur during installation and production, and the cycle of pressure maintenance and maintenance is very short, the cost is particularly high, and the production is unstable

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