Eight categories of injection molds
(1) When the single parting surface injection 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 or 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 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 mold part. Plate (also called movable gate plate, on which there are gates, runners and other parts and components required by fixed mold), so it is also called three-plate (movable template, intermediate plate, fixed template) injection mold, it is commonly used For single-cavity or multi-cavity injection molds that are fed at a point gate, 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 gating system can be taken out between the two templates Aggregate. 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 laterally 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-molding Take off the core. (4) Injection molds with movable forming parts due to the special structure of plastic parts, the injection mold is required to be equipped with movable forming parts, such as movable punches, movable concave molds, movable inserts, movable thread cores or The molding ring, etc., can be moved out of the mold together with the plastic part during demolding, and then separated 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, or Set up a special transmission device to drive the threaded core or threaded ring to rotate, so as to get out of the plastic part. (6) No-runner injection mould No-runner injection mould refers to the method of adiabatic heating of the runner to keep the plastic between the nozzle and the cavity of the injection moulding machine in a molten state, so that there is no pouring system when the mould is opened and the plastic part is 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. 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. His main channel is opened 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 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) In most injection molds, the demolding device of the injection mold on the fixed mold is installed on the side of the movable mold, which facilitates 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 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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