Needle vale control system for cold runner sprues

Abstract

The invention relates to the technical field of injection molding and discloses a needle vale control system for cold runner sprues. The needle vale control system comprises a front mold, a rear mold, a needle valve hot sprue and a runner assembly, wherein the needle valve hot sprue is used for outputting molten-state plastic, and the runner assembly is mounted on the needle valve hot sprue. The runner assembly is internally provided with a runner which can allow the molten-state plastic to flow therein. The runner assembly is provided with one or more normally-opened sprues and one or more controllable sprues. A control structure is arranged at each controllable sprue, wherein each control structure is used for controlling the corresponding controllable sprue to be opened and closed. By means of the needle vale control system for the cold runner sprues, different numbers of normally-opened sprues and controllable sprues can be designed as needed; each controllable sprue is controlled to be opened and closed according to different injection molding process requirements, thus the injection molding sequence of the multiple sprues can be controlled, and injection molding is conducted at the same time at multiple points; due to the fact that the number of needle valves is reduced, the space occupied by the needle vale control system is small; and after injection molding is achieved, injection molding defects such as welding marks and air trapping cannot be generated easily.

Description

technical field [0001] The invention relates to the technical field of injection molding, in particular to a cold runner gate needle valve control system. Background technique [0002] Injection molding is a common and mature production process, but when faced with complex injection molded parts, such as exterior parts such as automobile grilles and fenders, such large injection molded parts that require a first-level appearance surface have complex product structures and The appearance requirements are extremely high. For such large and complex special-shaped plastic parts, the position of the injection molding inlet needs to use computer-aided analysis (CAE) to simulate the flow of molten plastic in the cavity and analyze the filling effect of each part of the product. In order to determine the ideal position of the feed inlet, defects such as weld lines and trapped air are prone to occur during the molding process, and the control of the gating system is the biggest techn...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a cold runner gate needle valve control system, aiming at problems such as welding marks, trapped air and other injection molding defects that are prone to occur in the injection molding process of complex injection molded parts in the prior art

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