Injection mold with retractable gate runner and electric pouring gate cutting device

Abstract

The invention relates to an injection mold with a retractable gate runner and an electric pouring gate cutting device. The injection mold comprises a gating system capable of controlling the size of the gate runner and a cutting device capable of cutting a pouring gate off in the molten state. In the injection mold with the retractable gate runner and the electric pouring gate cutting device, before injection molding and filling, the retractable gate runner is stretched to the maximum extent through the gating system, so that a fluid quickly fills the mold under lower pressure, and pressure losses are reduced; in the pressure maintenance process, the retractable gate runner can be compressed to the minimum extent through the gating system, so that waste materials are reduced, and pressure maintenance feeding is promoted; in the cooling and shaping process, the pouring gate is quickly cut off through the cutting device, and the gate runner is stretched to the maximum extent through the gating system; and in the mold opening process, a product and the waste materials are ejected. By the injection mold, injection pressure is reduced, the waste materials are reduced, the production efficiency is improved, and the problems of bubbles, dents and insufficiently-filled plastic pieces which are generated in the filling process, unattractive appearance caused by artificially-cut products and the like are solved at the same time.

Description

technical field [0001] The invention relates to the technical field of plastic injection moulds, in particular to a mould with a runner shrinkage function and an electric gate shearing device. Background technique [0002] Plastic injection mold gating system is generally composed of main runner, branch runner, cold material cavity and gate. The design of the gating system requires a small pressure loss, and the injection pressure is transmitted to each part of the cavity to obtain a plastic part with a clear appearance and good quality. While ensuring the pressure, the gating system accommodates as little plastic as possible. The inner diameter of the gating system has a very obvious influence on the pressure drop. At present, the inner diameter of the gating system is usually fixed. The length-diameter ratio of the sprue is large, the pressure loss is large, and a high filling pressure is required, which is easy to produce residual stress, bubbles, etc. Defects such as de...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, provide a plastic injection mold that can control the size of the runner, and can automatically cut off the gate and the product at the same time, so as to solve the problem of high mold filling pressure, uneven mold filling, plastic injection molding, etc. The problem of connecting the product and the handle

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