Eight classifications of injection molds

2019-12-27

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(1) Single parting surface injection mold

When the mold is opened, the movable mold and the fixed mold are separated, so that the plastic part is taken out, which is called a single parting surface mold and also called a double-plate mold. It is the simplest and most basic form of injection mold. It can be designed as a single cavity injection mold or a multi-cavity injection mold as required. It is the most widely used injection mold.

(2) Double parting surface injection mold

The double parting surface injection mold has two parting surfaces. Compared with the single parting surface injection mold, the double parting surface injection mold adds a partially movable intermediate plate (also called movable gate plate) in the fixed mold part. It is equipped with gates, runners and other parts and components required for fixed molds), so it is also called a three-plate (moving template, intermediate plate, fixed template) injection mold, which is often used for single-type gate feeding. Cavity or multi-cavity injection molds. When the mold is opened, the intermediate plate is separated from the fixed template at a fixed distance on the guide pillars of the fixed mold in order to remove the condensate of the pouring system between the two templates. Double parting surface injection mold has a complicated structure, high manufacturing cost, and difficult parts processing. It is generally not used for the molding of large or extra large plastic products.

(3) Injection mold with lateral parting and core pulling mechanism

When the plastic part has side holes or undercuts, it is necessary to use a core or a slider that can move sideways. After injection molding, the movable mold is first moved downward for a distance, and then the slanted section of the bent pin fixed on the fixed template forces the slider to move outward. At the same time, the pusher of the demolding mechanism pushes the pusher plate to make the plastic part shape Take off the core.

(4) Injection mold with movable molded parts

Due to some special structures of plastic parts, injection molds are required to be equipped with movable forming parts, such as movable convex molds, movable concave molds, movable inserts, movable threaded cores or rings, etc. Move out of the mold together and separate from the plastic part.

(5) Automatic thread unloading injection mold

For plastic parts with threads, when automatic demolding is required, a rotatable threaded core or ring can be set on the mold, using the mold opening action or the rotating mechanism of the injection molding machine, or a special transmission device to drive the threads The core or threaded ring rotates to release the plastic part.

(6) Non-runner injection mold

The runnerless injection mold refers to the method of adiabatic heating of the runner to keep the plastic between the nozzle and the cavity of the injection molding machine in a molten state, so that there is no pouring system condensate when the plastic part is opened and the plastic part is removed. The former is called adiabatic runner injection mold, and the latter is called hot runner injection mold.

(7) Right-angle injection mold

Right-angle injection molds are only suitable for angle injection molding machines. Unlike other injection molds, the feeding direction of this type of mold during molding is perpendicular to the opening and closing mold direction. His main flow path is set on both sides of the parting surface of the moving and fixed molds, and its cross-sectional area is usually constant. This is different from other molds for injection molding machines. The end of the main flow path is to prevent the injection molding machine. The nozzle and the inlet end of the main channel are worn and deformed, and a replaceable flow channel insert can be provided.

(8) Injection mold of the release mechanism on the fixed mold

In most injection molds, the ejection device is installed on the side of the movable mold, which is conducive to the work of the ejection device in the opening and closing mold system of the injection molding machine. In actual production, because some plastic parts are limited by shape, it is better to leave the plastic part on the side of the fixed mold. This makes the plastic part come out of the mold, so it must be set on the side of the fixed mold. mechanism.

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