Design And Manufacturing Of Trash Can Mould

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    Manufacturing and Design of Trash Can Mould
    The design requirements of molded plastic trash cans sometimes do not allow the trash can to be directly taken out of the plastic trash can mold when opened. This is the case when the plastic trash can is undercut relative to the line of travel or the opening and closing of the mold. The usual practice is to modify the design as much as possible to make the simplest mold.
    The waste bin mould loose-rod injection bin mould is a useful design to overcome the difficulty of ejecting long and thin bins. The sliding box cover is shown in Figure 1. It is a typical example of a trash can, which cannot be ejected directly due to its 4-inch long stretch and 0.040-inch thin section. With these characteristics, it is impractical to eject the required end forming directly when the press is opened. This is because the effect of the ejector mechanism depends on the opening stroke. Moreover, the mold will be very bulky-at least twice the length of the waste bin to leave room for the waste bin and ejector. By molding on the core connected to the loose rod, the letters can be molded on the top surface of the box because it is pulled directly out of the cavity when the mold is opened. For the loose rod mold for the lid, the rod will be manually removed and replaced by a duplicate rod so that when the second rod is in the mold, the bin can be peeled off on the workbench. No ejector device is required. The mold is very simple, consisting of front and rear adapter plates, cavity modules and cages, loose rods and core components, guide pins and cages, and gate systems.
    Adapter board
    The two adapter plates of the trash can mold are used as guide pins, bushings and the back plate of the cavity module. The ejector end plate (detail 1) does not need to be hardened because the guide pin has almost no tendency to sink. The end plate is made of ordinary flat billet, and cold rolled steel can be used. If the slab needs to be ground flat, machined steel should be used because it will not warp when the skin is removed. The injection end plate (detail 10) is serviced more strictly because it is the support plate of the cavity. It should harden. The plate has a circular mounting boss and is punched to enter the jet cylinder head. The mounting boss is not shown on the pop-up adapter, because some designers prefer to let the end float and be positioned by the guide pin. A large hole in the pressure plate is undesirable because it weakens the pressure plate so that it bends and deforms. At the injection end, there must be a larger hole to allow the injection cylinder to enter as close to the mold as possible to prevent excessive cooling of the plastic as it enters the gate through the nozzle. Therefore, a mounting boss is already included on the injection end adapter plate.
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