1: Design ideas for inclined top:
1). First calculate the tripping stroke of the inclined top, and then calculate the slope of the inclined top according to the ejection stroke;
2). Then make the sealing position in the lateral movement direction of the inclined top. Horizontal sealing is preferred, and vertical sealing can also be used. When using vertical sealing, it should be noted that whether the glue position of the product buckle position will deform laterally with the inclined top. If the space for lateral movement of the inclined top is limited, vertical sealing can be used
3). Then make the processing reference position of the inclined top. The processing reference position is based on the ejection direction of the glue position;
4). From the processing reference position, make the inclined surface of the inclined top downward
5). Adjust the thickness of the lateral movement direction of the inclined top. When the inclined top is always When the length is less than 100mm, the minimum thickness of the inclined top is guaranteed to be 6mm. If the total length exceeds 100mm, the minimum thickness of the inclined top is 8mm. If this thickness cannot be achieved, the total length of the inclined top is shortened.
6). Make glue seals on both sides of the inclined top. The glue seals can be determined based on the strength and position of the inclined top. If the strength is not enough, it can exceed the side of the inclined top. Just meet the glue sealing requirements.
7). Make a hole for the inclined top to pass through the template;
8). Make a pipe block for the inclined top
9). Make a design for the inclined top seat
10). Pay attention to avoid sharp corners as much as possible
B. Principles for selecting ejector pins
(1) Select an ejector pin with a larger diameter. That is, when there is enough ejection position, an ejector pin with a larger diameter and a preferred size should be selected. (2) The specifications of the ejector pin should be as few as possible. When selecting an ejector pin, the size of the ejector pin should be adjusted to minimize the size specifications, and the preferred size series should be selected as much as possible. (3) The selected ejector pin should meet the ejection strength requirements. During ejection, the ejector pin has to bear a large pressure. To avoid the bending and deformation of the small ejector pin, when the ejector pin diameter is less than 2.5mm, a support ejector pin should be selected. Slide position, inclined ejector
welcome
When the side wall of the plastic part has concave and convex shapes, side holes and buckles, the side core must be pulled out before the mold is opened to eject the plastic part. This mechanism is called a slide position. As shown in Figure 3.2.8, the outer hole of the plastic part requires the rear mold slide position to pull the core. As shown in Figure 3.2.9, for the inner groove of the plastic part, if the inclined ejector is used for ejection, the top opening distance is not enough, and the inner slide position must be used. In addition, the ejection mechanism that uses inclined ejection to complete ejection and core pulling at the same time is called an inclined ejector. For the part on the plastic part that needs to pull the core, when the slide position space is insufficient, the inclined ejector mechanism can be used to complete it. In the inclined ejector mechanism, the inclined ejection distance should be greater than the core pulling distance (B > H) as shown in Figure 3.2.10 to prevent ejection interference. As shown in Figure 3.2.11, the inner and outer walls of the plastic part are concave, and the inner side is blocked by bone and has insufficient height. It is necessary to position the front mold of the outer wall and push the inner wall out of the mold at an angle.
