The process of arranging plastic molds is a highly comprehensive task. Designers must have a good understanding of the method of gluing, the design and processing of the parting surface, the distribution technique of the ejector pin, the appearance requirements of plastic products, common defects, etc., in order to do this with confidence.

Firstly, when receiving a plastic product for mold design, the first thing to consider is the injection position and method. The glue feeding is also affected by the number of holes in the the first mock examination and whether the molded product is a exterior part. There are also ways to produce one, usually for large items or those with strange shapes; The best way is to use a one out two layout, which is most suitable for side entry or submerged entry of large water outlets; The second method is the one out four method, which is equivalent to adding two one out two together. However, the length of the flow channel needs to be considered here. An appropriate length of the flow channel can not only save glue, but also make the glue injection smoother; And the ways of one out of six, one out of eight, one out of sixteen, etc. can all be said to be the evolution of one out of four.

When designing the flow channel, it is recommended that the upper flow channel be 25% larger than the lower flow channel. In addition, if the molded product is an exterior part, it is often not advisable to use a large water inlet for side gluing, as this can damage the appearance of the product. At this time, it is advisable to use more point gluing or diving on the top pin. However, caution should be taken when using diving on the top pin, as sometimes the surface of the product may be scratched.

Secondly, the design of the parting surface. When designing a parting surface, the first thing to check is the issue of reverse buckling. When designing the parting surface, the structure of the mold should also be considered, such as the strength and feasibility of the mold structure, the ease of processing of the parting surface, and the actual processing capacity of the factory. When designing, try to use flat parting surfaces and avoid using curved parting surfaces.

Thirdly, once all of the above are confirmed, the size of the mold can be determined. At this point, design all the 3D images corresponding to the plastic product images, using a 1:1 ratio. Then, make a copy and mirror it, and multiply it by the shrinkage rate of the plastic product.

Next, use a mirrored and scaled graph to rank. For example, if there is a flow channel between two products, how should the length of this channel be determined? Generally, the nozzle is designed at the center of the mold base, so the distance between two products should be at least enough to accommodate one nozzle, and the steel strength of the adhesive position should be ensured. For example, if the diameter of the mouthpiece is 12, the distance between two products should be at least 30mm. Of course, this also depends on the size and height of the product, and it is best to ensure that the center distance between the two products is an integer. Once the center distance between the two products is determined, the size of the inner mold can be determined. The usual practice is to move the edge of the product outward by 30mm, and then make some adjustments to the details according to the actual situation.

The size of the inner mold is mainly influenced by the water channel and the screws that lock the inner mold. The water channel is mainly affected by the size of the product and the distribution of the top pins, which are based on the product.

Once all of the above is done, the size of the mold base can be determined. The size of the mold base is about the size of the inner mold plus 50mm. However, it is still necessary to take a look at the mold base, which should follow a principle that the edge of the inner mold to the return needle edge should be at least 10mm, and the edge to the top needle plate should be plus or minus 5mm.

Fourthly, once all the sizes mentioned above have been determined, the next step is to focus on the details, such as refining the mold base and exhaust the internal mold.