A plastic mold is a tool that is matched with plastic molding machines in the plastics processing industry to give plastic products a complete configuration and precise size. The different molding methods can be divided into different types of molds. Through the cooperation of various systems or auxiliary mechanisms in the mold, the plastic particles are liquefied and filled into the mold cavity at high temperature, and a tool for producing industrial parts with a specific shape, size, function, and quality is produced. Common mold classification can be divided into the following categories:
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 parts, which is called a single parting surface mold, also known as 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 according to needs. It is the most widely used injection mold.
2. Double parting surface injection molding
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 the movable gate plate, There are gates, runners, and other parts and components required for the fixed mold), 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. In a cavity or multi-cavity injection mold, when the mold is opened, the intermediate plate is separated from the fixed platen by a certain distance on the guide column of the fixed mold, so that the pouring system condensate can be taken out between the two plates.
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.
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 a certain distance, and then the inclined plane section of the curved pin fixed on the fixed platen forces the slider to move outward, and at the same time, the push rod of the demoulding mechanism pushes the push plate to make the plastic part form itself. Take off the core.
4. Injection mold with movable molding parts
Due to some special structures of plastic parts, the injection mold is required to be equipped with movable molding parts, such as movable punches, movable concave molds, movable inserts, and movable threaded cores or rings, etc., which can be combined with the plastic parts during demolding. They are removed from the mold together and then separated from the plastic part.
5. Automatic unthreading injection mold
For threaded plastic parts, when automatic demolding is required, a rotatable threaded core or ring can be set on the mold, and the mold opening action or the rotation mechanism of the injection molding machine, or a special transmission device can be used to drive the thread. The core or threaded ring rotates, thereby dislodging the part.
6. No runner injection mold
The runners' 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 gating system congealing when the mold is opened and the plastic parts are 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. Different from other injection molds, the feeding direction of this type of mold is perpendicular to the opening and closing direction during molding. Its main flow channel is opened on both sides of the moving and fixed mold parting surfaces, and its cross-sectional area is usually unchanged, which is different from other injection molding machine molds. The end of the main flow channel is used to prevent the injection molding machine. The wear and deformation of the nozzle and the inlet end of the main flow channel can be replaced by a replaceable flow channel insert.
8. The injection mold of the demolding mechanism on the fixed mold
In most injection molds, the demolding device is installed on the side of the movable mold, which is beneficial to the work of the ejector device in the mold opening and closing system of the injection molding machine. In actual production, because some plastic parts are limited by their shape, it is better to leave the plastic parts on the side of the fixed mold for molding. In order to make the plastic parts come out of the mold, it is necessary to set the mold release on the side of the fixed mold. mechanism.
https://www.china-3dprinting.com/metal-3d-printing/metal-3d-printed-injection-mold.html