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What is a mold and what are its classifications?

TIME:2021-03-04 Share

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 injecting the material melted by heat into the mold cavity by high pressure, and after cooling and solidifying, the molded product is obtained.

What are the 4 major categories of injection molds?
1. Single parting surface injection mould
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 injection molds. 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 mould
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 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 post of the fixed mold, so that the condensate of the pouring system 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 extra-large plastic products.
injection mold
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 slider that can move laterally. 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-shape Take off the core.

4. Injection mold with movable molded parts
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.

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 the 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.

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