Injection mold design is a complex systems engineering, must consider many aspects, and should follow the following basic requirements.
  1.for reasonable selection of die structure, die structure selection is critical, the mold structure is related to many factors, and therefore, according to the drawings and technical requirements of plastic parts, selection of equipment and molding method, combining with the machining capacity of the plant, the mold structure scheme, and then fully solicit opinions, so as to make the mould structure reasonable.
  2.die should be convenient manufacture, from drawings into parts, go through a series of processes, some parts, such as punch, die, its surface, high precision, processing is not easy, therefore, in the design should give priority to processing machinery and equipment in general, less use of special equipment for processing. Then, in part after processing, but also consider the ease of assembly, a mold repair margin.
  3.to correctly determine the plastic parts of the size, the melt solidification shrinkage at will, and the shrinkage is not the same, the plastic parts size and cavity size difference. In the calculation of molding parts, the general use of average shrinkage method, and control the product mold repair allowance for high precision, it can be calculated according to the tolerance zone method; for large precision products, the best analogy method. In a word, because the melt contraction effect, the change of plastic parts size is not the same, therefore, in the mold design should seriously consider.
  4.to reduce the processing of plastic parts, plastic parts molding after processing is often not less, the post processing is time-consuming and laborious, greatly influence the productivity. Therefore, should be able to meet the product design characteristics of plastic parts with mould forming directly, including the hole, slot, convex, concave part, reduce the overflow port, gate size, reduce or avoid unnecessary after processing, which can greatly improve the economic benefit. Therefore, in the mold design should give full consideration to this point.
  5.die should be durable, a mold, can produce tens of thousands or even hundreds of thousands of pieces of plastic, die life is longer, the more significant economic benefits. In each set of molds, various parts of the durability is not the same, the easy to wear, damage parts, in the aspects of material, processing method, heat treatment should provide the necessary requirements, but also consider the easy damaged parts to conveniently adjust and change. In addition, but also pay attention to the life of parts and die adaptation.
  6.die should be reliable, mould made from a blend of many organizations organically together, they carry out their duties, any agency problems, will affect the quality and efficiency of plastic parts, such as mold closing system should be reliable, locking good, pouring system need filling fast, melt flow channel flow, temperature control temperature control system accurate, demoulding mechanism can accurately, smoothly products stripping, only the die is reliable in operation, to the stable production of qualified plastic parts.
  7.The is suitable for forming properties of plastics, each kind of plastic, has the very big difference and its forming characteristics, and the die structure should be considered different forming characteristics of different plastics, to design the mold on the basis of these different characteristics, try to meet the requirements, it is also an important means to obtain high quality plastic parts.