Plastic Injection Mold, Injection Mold Maker, Mold Parts, JinHong Plastic Mold Factory

    The ejector pin is essential for making the part. They are an important part of the ejection system in the mold, which determines the outcome of the product during the injection molding process.

    The metal injection mold consists of two parts: A side and B side. After the molten material in the mold cools, the two parts are separated to remove the solid plastic. The injection molds are constructed so that when they open, half of the A side is lifted, leaving the molded part and the B side. The extraction pins are located on the B-side half of the injection mold, where they push the molded part out of the mold (or take it out).

    There are many types of ejector pins. Full hard ejector pins are heat treated to ensure consistent hardness across the diameter of the ejector pin. Case hardened ejector pins are much harder than full hard ejector pins and are suitable for die-casting ejector systems. The black ejector pins are painted with a black finish that makes them self-lubricating and withstands high temperatures up to 1000°C.

    The main reason for ejector pin breakage is the difference in the force required to eject the part from the mold and the strength of the ejector pin.

    Force is required to eject the part from the mold. Sometimes, due to its unsupported length, the force required exceeds the strength of the pin, resulting in breakage. Therefore, the most effective way to repair a broken ejector pin is to use a large number of ejector pins with a larger diameter. This way, the required force is evenly distributed across the pins, reducing breakage.