In-mold cut gate device and injection mold having the same

Abstract

The application discloses an in-mold gate cutting device and an injection mold with the same. The injection mold comprises a fixed mold assembly, a movable mold assembly, a cutting member with a working end, and a driving mechanism. The working end comprises a shearing part opposite to a section of a gating runner close to a molding cavity, and an extruding part with a larger cross-sectional area on the side of the shearing part away from the fixed mold assembly. The driving mechanism drives the cutting member to perform continuous variable-speed pushing processes in the direction close to the fixed mold assembly: in the first stage, the shearing part cuts off the melt in the section at a first speed and traps part of the melt; in the second stage, the extruding part extrudes the trapped melt at a second speed smaller than the first speed and pushes the trapped melt into the molding cavity to compensate for the volume shrinkage of the melt inside the molding cavity during the cooling and solidification process. The application effectively eliminates the surface shrinkage defects of the injection molded product by integrating the cutting and extruding compensation functions, and improves the molding quality.

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