Ejection Rods: The relevant function of ejector pins in injection molds
Release time:
2020-09-22 11:06
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Ejection RodThis refers to the ejector pin in an injection mold. The role of the ejection rod in the injection mold is very important.
In thermoplastic injection molds, there is usually a cold material cavity. Its function is to store cold material at the front end of the nozzle during the injection interval and prevent cold material from entering the cavity and affecting the quality of the plastic part. However, after opening the mold, it must be passedEjection RodThe cold material stored in the cold material cavity is ejected from the mold along with the plastic part through the ejector rod to facilitate the injection molding of the plastic part in the next cycle. The function of the ejection rod is to pull out the sprue from the sprue bushing when the mold is opened and discharge the cold material from the cold block hole. Commonly usedEjection RodThe structure mainly includes the following structures: 1.Ejection RodConfiguration: The shape of the head of the ejector rod can hook the sprue and pull it out of the sprue bushing when the mold is opened. Because the tail of the ejector rod is fixed on the mold, the sprue is also ejected when the plastic part is ejected. This type of ejector rod is only suitable for plastic parts that are allowed to move left and right during demolding. Some plastic parts cannot move left and right during demolding, so this type of ejector rod cannot be used.Ejection RodStructure. After the molten plastic enters the cold material hole, it tightly wraps around the ball head of the ejector rod. After opening the mold, the sprue is pulled out from the sprue bushing, and the bottom of the ball head ejector rod is fixed on one side of the movable mold. The core fixing plate does not move with the ejection mechanism. When the push plate pushes the plastic part, the sprue will be forced out of the spherical head ejector rod. Therefore, this type of ejector rod is only suitable for plastic parts with a push plate as the ejection mechanism.Ejection RodStructure. This tapered ejector rod does not have the function of storing cold material. It relies on the packaging force of the plastic to pull out the sprue to increase the friction of the cone. This can be achieved by using a smaller taper or increasing the surface roughness of the conical surface. The tip of the tapered ejector rod also acts as a distributor, often used to form cavity molds with central holes. In addition, for plastic parts with good elasticity, sometimes it is not necessary to use an ejection rod, that is, the cold material cavity is designed into a truncated cone or circular groove shape, and the cold material and condensed water mainly rely on the bottom push rod to force it.
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Zhanwang Machinery Co., Ltd., Dongguan
Dongguan Zhanwang Machinery Co., Ltd. is a manufacturer and supplier of various precision mechanical parts, including rubber and plastic machinery parts, pneumatic and hydraulic machinery parts, precision shafts, piston rods, standard chrome-plated bars, guide columns, uprights, guide pillars, rollers, etc. We provide surface treatments such as super mirror polishing, hard chrome plating for different specifications of precision mechanical parts and various molds. We also offer additional surface treatments such as tempering, medium and high-frequency quenching, nitriding, and blackening for mechanical parts. Our factory is equipped with large CNC lathes, ordinary lathes, external cylindrical grinders, centerless grinders, and milling machines, enabling us to process and manufacture various special mechanical parts. We offer free pick-up and delivery with competitive Price.
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