![]() (4) Flat ejector pin should be used in deep bone position (depth ≥20mm) or difficult to arrange round ejector pin. (3) Avoid crossing steps or setting ejector pin on the inclined plane, the top surface of ejector pin should be as gentle as possible, ejector pin should be arranged in the structure of the adhesive part with better force. In addition, the central Line of the ejector pin on both sides of the column position should be ensured to pass through the center of the column position. The ejector pins on both sides of the bone position and column position should be arranged symmetrically as far as possible, and the distance between the ejector pin and the bone position and column position should be D=1.5mm, as shown in the figure below. (2)Ejector pin should be set in effective parts, such as bone position, column position, step, metal insert, local thick glue and other complex structure parts. The part with complex structure requires larger demounding force, so the number of ejector pin should be increased accordingly. (1)Ejector pin layout should make the top force as balanced as possible. Because the thinner ejector pin may break or bend under stress, we designed the ejector pin as a step type, and the back end is thicker than the ejector end, so as to enhance the strength of the ejector pin. Threeup is no longer producing 65Mn ejector pin products.Ĭ: According to different Ejector pin appearanceĪccording to the appearance of ejector pin, we are divided into ordinary ejector pin (round ejector pin), flat ejector pin, pin and so on.Ĭommon ejector pin are round ejector pin, and flat ejector pin is also called flat pin, mainly used for the top part of the rib of plastic products, and there is a long strip of glue, round Ejector pin can not be placed, we choose to use flat ejector pin. Most companies that have requirements on mold quality have stopped using the ejector pinn of 65Mn material. However, the ejector pin of 65Mn is brittle and easy to break due to its poor quality. SKD11, due to its good wear resistance, high hardness and excellent machinability, is more commonly used to produce punch needles and other products. SKH51 ejector pin has good toughness, SKD61 ejector pin surface after vacuum nitriding treatment can well improve the wear resistance of ejector pin, internal quenching and tempering hardness HRC40-45 degrees, after secondary tempering, SKD61 ejector pin has high toughness, High heat resistance, the working temperature can reach 550 degrees, suitable for long time use of high temperature mold. When purchasing ejector pin, in addition to determining the length and diameter of ejector pin, please be sure to determine the head size of ejector pin, which is the main basis for distinguishing different ejector pin standards.ī: According to ejector pin raw material and heat treatmentīecause ejector pin needs to be frequently pulled and pushed out in the template, ejector pin material needs to have a certain degree of hardness, wear resistance, etc., the common materials of plastic mold ejector PIN are SKH51, SKD61 (1.2344), SKD11 (1.2379), 65Mn, etc. European standards represented by HASCO and MEUSBURGER, Japanese standards represented by MISUMI and PUNCH, and Taiwan standards widely used in China. Mainstream companies have formulated their own ejector pin head standards and specifications, among which the American standard represented by DME is the most commonly used. Definition of ejector pin: In the process of injection molding, when the mold cavity is filled with resin and begins to release, the ejector pin is pushed out to the preset position by the ejector pin after the mold, and the product is pushed out by the ejector pin so as to realize the separation of the product and the mold.Ī:According to ejector pin specificationsĪccording to the usage habits of different countries and regions, the appearance of several mainstream companies in the mold and parts industry is slightly different, mainly reflected in the head size of ejector pin.
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