The ejector is the simplest and most common form of ejection mechanism in injection molds. Because of its convenient manufacturing, processing, and repairing, and good ejection effect, it is the most widely used in production. However, the circular ejection area is relatively small, and it is easy to produce stress concentration, push through the product, and deform the product.
Try to avoid using it in tubular box-shaped products such as small demolding slopes and large resistance. When the ejector rod is relatively slender, a stepped ejector pin is generally arranged to strengthen the rigidity and avoid bending and breaking.
The ejector tube is also called the cylinder or the cylinder needle, which is suitable for annular, cylindrical, or products with a center hole. The ejection is uniform in contact with the whole circumference, and it will not deform the product, and it is not easy to leave obvious ejection marks, which can improve the concentricity of the product. However, avoid using products with thick and thin surrounding meat to avoid damage caused by processing difficulties and weakened strength. The push plate is suitable for a variety of containers, boxes, cylinders, and slender thin products with a central hole. It ejects smoothly and evenly, with strong ejection force, leaving no ejection marks. Generally, there will be fixed connections to prevent the push plate from being pushed down during production or demolding, but as long as the guide post is long enough and the demolding stroke is strictly controlled, the push plate may not be fixed.
The determination of the ejection type is the most important link in the ejection design. It is very important to optimize the ejector type, quantity, and ejection position according to the ejection force and demolding resistance.