After the read, you will learn about the following are eight categories of injection molds.
- Single parting surface injection mold
- Double parting surface injection mold
- Injection mold with lateral parting and core pulling mechanism
- Injection mold with movable molded components
- Automatic thread unloading injection mold
- Runnerless injection mold
- Right angle injection mold
- Injection mold with demoulding mechanism on the fixed mold
Injection mold is a tool for producing plastic products; it is also a tool for giving plastic products a complete structure and precise dimensions.
Injection molding is a processing method used in the mass production of some complex-shaped parts. Specifically, it refers to the high-pressure injection of the plastic melted by heat into the mold cavity by the injection molding machine, and the molded product is obtained after cooling and solidification.
Different types of products need to customize injection molds and produce different molds to meet different product needs.
The following are eight categories of injection molds.
(1) Single parting surface injection mold
When the mold is opened, the movable mold and the fixed mold are separated to take out the plastic part, which is called a single parting surface mold, also called a double plate mold. It is the simplest and most basic form of the injection mold. It can be designed as a single cavity injection mold or a multi-cavity injection mold according to needs. 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 an intermediate plate (also called movable gate plate, It is equipped with gates, runners, and other parts and components required by the fixed mold), so it is also called a three-plate (moving plate, intermediate plate, fixed plate) injection mold, which is often used for single-type point gate feeding for injection molds with multiple cavities or multiple cavities when the mold is opened, the intermediate plate is separated from the fixed template at a fixed distance on the guide pin of the fixed mold so that the casting system aggregate can be taken out between the two templates.
The double parting surface injection mold has a complex structure, high manufacturing cost, and difficult parts processing. Generally, it is not used for the molding of large or super 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 side-movable core or slider for molding. After injection molding, the movable mold first moves down for a certain distance, and then the inclined section of the bending pin fixed on the fixed template forces the slider to move outward, and at the same time, the push rod of the demolding mechanism pushes the pusher plate to make the plastic part self-shaped Take off the core.
(4) Injection mold with movable molded components
Due to the special structure of plastic parts, the injection mold is required to be equipped with movable molding parts, such as movable punches, movable concave molds, movable inserts, movable thread cores, or rings, etc., which can be combined with the plastic parts during demolding. Move out of the mold together, and then separate from the plastic part.
(5) Automatic thread unloading injection mold
For plastic parts with threads, when automatic demolding is required, a rotatable thread core or ring can be set on the mold, and the mold opening action or the rotation mechanism of the injection molding machine can be used to drive the thread. The core or the threaded ring rotates so that the plastic part is released.
(6) Runnerless injection mold
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 condensate in the pouring system when the mold is opened and the plastic part is taken out. 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. The difference from other injection molds is that the feeding direction of this type of mold is perpendicular to the opening and closing directions during molding.
Its main channel is opened on both sides of the parting surface of the moving and fixed molds, and its cross-sectional area is usually the same. This is different from the molds used in other injection molding machines. The end of the main channel is to prevent injection molding machines. For the wear and deformation of the nozzle and the inlet end of the main runner, replaceable runner inserts can be set.
(8) Injection mold with demoulding mechanism on the fixed mold
In most injection molds, the demolding device is installed on the side of the movable mold, which facilitates the work of the ejector device in the opening and closing 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 for molding. This makes the plastic part out of the mold, and it is necessary to set a release on the side of the fixed mold. mechanism.