The hottest three plate forced demoulding structur

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Three plate forced demoulding structure

the three plate structure is a widely used structural form in the structure of injection mold, which is mainly applied to the point flexure type in the ordinary pouring system and the lateral core pulling structure of the inclined slider on the cavity plate. The design of these structures has become an example. Here is a three plate structure type applied to the forced demoulding structure. The product form is shown in Figure 1, which is more penetrated into high-end products. The product is the support seat of industrial products, and the material is PE. It can be seen from Figure 1 that there is a convex part in the top structure of the product, and the Ru part is formed by the cavity. The key to the design of the die is how to separate the convex part on the top of the product from the die after forming

1 mold structure analysis

in order to make the convex part on the top of the product come out during the mold opening process and keep the product in the moving mold, the inner core at the molding place must be extracted from the release mold before the product comes out of the cavity, so that the convex part on the top of the product has a space for inward elastic deformation during the meat removal cavity. For this reason, the molded product core is composed of two parts. In the process of mold opening, the package needs to be wrapped on the lower half core, and follow the moving mold to move, and finally realize the ejection of the product. According to the above analysis, the structure of the supporting seat mold is shown in Figure 2

2 mold structure design

the mold of the trial product adopts the structure of one mold, two cavities, side gate and three plates. The side gate structure is simple, and the gate is located on the di II parting surface. Because the mold adopts a three plate structure, in order to prevent the overflow of runner at the first parting surface, the sprue sleeve is long and needs to pass through the first parting room to reach the second parting surface. In order to ensure the smooth cooperation between the sprue sleeve and the formwork when closing the formwork, the front end of the sprue sleeve needs to be inverted at a certain angle

the sequential demoulding action of the three plate tread mechanism usually adopts the fixed distance parting mechanism. The mechanism types include hook fixed distance parting mechanism, slider fixed distance parting mechanism, spring fixed distance parting mechanism and other forms. The products of ISO 7765 extruder with vertical socket mold fluctuate in export ⑴ because the demoulding resistance of the upper half core of the product is small, the nylon pin type is adopted, as shown in Figure 2. When parting, the swelling movement is driven by the friction between the nylon pin and the cavity plate hole, so as to achieve the purpose of one-time parting

Another key part of the three plate structure design is the strength of the limit rod, that is, the cavity plate is supported by the limit cutting after one parting, and the simplified mechanical model is a cantilever structure. The deformation of the limiting rod (cantilever beam) due to the weight of the cavity plate must be within the limited range and as small as possible. In this way, the mold can be closed smoothly and reliably without damaging the mold. This problem has been stated in some literatures

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