What Are The Eight Categories Of Injection Molds?

Injection mold is a processing method used in mass production of some complex shapes. The specific principle refers to: the heated and melted plastic raw material is pushed by the screw of the injection molding machine into the cavity of the plastic mold under high pressure, and after cooling and solidification, the plastic molding product is obtained.

(1) When the single parting surface injection 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 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 middle part that can be moved locally in the fixed part. Plate (also known as movable gate plate, on which there are gates, runners and other parts and components required for fixed mold), so it is also called three-plate (moving template, intermediate plate, fixed template) injection mold, which is commonly used. For single-cavity or multi-cavity injection molds fed by point gate, 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 gating system can be taken out between the two plates. aggregate. The double-parting surface injection mold has a complex structure, high manufacturing cost, and difficult parts processing. It is generally not used for the molding of large or extra-large plastic products.

(3) For the 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 section of the curved pin fixed on the fixed plate 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) Due to some special structures of plastic parts, the injection mold with movable molding parts requires the injection mold to be equipped with movable molding parts, such as movable punches, movable concave molds, movable inserts, movable thread cores or Rings, etc., can be moved out of the mold together with the plastic parts during demolding, and then separated from the plastic parts.

(5) Automatic unthreading injection mold For threaded plastic parts, when automatic mold release 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 can be used, or Set up a special transmission device to drive the threaded core or the threaded ring to rotate, thereby releasing the plastic parts.

(6) No runner injection mold No runner 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 when the mold is opened and the plastic parts are taken out. aggregate. The former is called adiabatic runner injection mold, and the latter is called hot runner injection mold.

(7) Right-angle injection molds Right-angle injection molds are only suitable for angle injection molding machines. Different from other injection molds, the direction of feeding of this type of mold during molding is perpendicular to the direction of opening and closing. 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 with the demoulding mechanism on the fixed mold In most injection molds, the demolding device is installed on the side of the movable mold, which is conducive 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 the 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.

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