1/4/2024 0 Comments Ejector pin marks![]() ![]() If all goes well they barely leave a mark, but sometimes this is not the. These marks can easily crack during the use of the actual products, so you want to prevent ejector pin marks before they happen. Ejector pins are utterly vital to the process of creating injection moulded parts. In this way, despite regrinding the correct ejector pin length can be guaranteed. Ejector pin marks, sometimes called pin push, are the glossy or white imprints caused by the ejector pins that show on the class-A surface of the part. When removing the Keeper Key, the pin is released again and protrudes the punch in the same length as the wire diameter of the Keeper Key. The pin is held in the punch and reground together with the punch point. It is defined as a restraining device, which is inserted through the side vent hole from the outside into the punch and locks the pressed ejector pin below the head of the pin. Apart from knocking out the solidified casting from the die, ejector pins would leave pin marks on the component. In order to regrind the punch, the Keeper Key is used. In this regard, the slug is released from the punch point. ![]() + If ejector pin is too small, change to new ejector pin with bigger. After breaking out the slug, the spring can decompress and pushes the ejector pin out of the punch. chips made in the 80s and before were rarely laser-marked at the factory, and usually have pad-printed or silkscreen markings. + If sample has scratch at boss, rib -> lapping the mold at these position. The punch can work as usual and produces the desired hole geometry in the part material. At the same time the ejector pin is pushed back and compressed the spring. to position the pins to minimize cosmetic witness marks on your finished parts. The set screw is screwed into the head of the punch and secures the entire system.ĭuring impact the punch first makes contact with the part material. The ejector pin is used to eject plastic parts during injection molding. The spring on top of the Jektole® ensures the necessary force of the ejector pin. Jektole® extends from the punch point to the side vent hole on the punch, which primarily allows pressure equalization inside. All components are removable and can be reordered and possibly replaced. Since in some cases they can leave marks, it is important to give proper forethought to their. The entire system consists of three parts: Jektole® Pin, Spring, Set Screw. Ejector Pins apply a force to eject a part from the mold. Whether Ball Lock, Press Fit, Tuff Punch, 60°or 30° head, trombone neck – Jektole® can be used with every DAYTON punch. Jektole® is integrated in the punch and serves to eject the slug from the punch point. It is a good policy to specify a large draft angle wherever practical but angles of one degree or less are tolerable.The ejector pin is also called Jektole® in the DAYTON world. Draft required on outside walls is half of that required on inside walls. It will vary with alloy used and with the depth of the wall as indicated. Draft RequirementsĪll walls on die castings normally vertical to the parting plane of the die casting die require draft or taper. Note – Complete removal of ejector pin marks and flash by machining or hand scraping operations should be specified only when requirements justify the expense involved in the extra operation or operations necessary. Where this is not suitable, such ejector pin mark flash may be crushed or flattened. If end use permits, ejector pin mark flash will not be removed. Ejector pin marks are surrounded by a flash of metal. Acceptable Ejector Pin MarksĮjector pin marks on most die castings may be raised 0.38mm maximum or may be depressed 0.38mm maximum. Location of Ejector PinsĮjector pin locations shall be at the option of the die caster subject to the customer’s agreement where required. The values shown for hole depths are subject to the draft requirements. Optimum greatest depth of cored holes as related to diameter is shown in the table.
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