Mould for plastic injection molding, known as the injection molding die, referred to as the injection mold. With the rapid development of plastics industry, increase and performance of the plastic varieties increased, the scope of application of plastic products continues to expand, in many fields of household appliances, instrumentation, automotive industry, building materials, daily hardware, the proportion of plastic products is rapidly increasing, industrial products, plastic tendency is rising. As one of the main injection molding process, mold, in its quality, accuracy, manufacturing cycle and injection molding process in the production efficiency of the level, directly affect the cost and the injection products quality, yield, renewal. Therefore, mold plays an important role in the production of plastic products. In general, there are several features of injection mold.
  1.design difficult. Because of the plastic melt is viscoelastic, melt flow process with the shear strain, shear strain rate changes, molecular mobility in the process of producing oriented along the flow direction. The cavity is filled melt is part of the compression, and the plastic in the solidification shrinkage in the process is very complex, the site, direction of shrinkage cavity are different, and different grades of resin shrinkage, there is a great difference in the rate of. Above all, both to the injection mold design brings great difficulty. This difficulty is that no other mechanical products.
  2.high manufacturing cost. Die are targeted to specific plastic products shape, specification design, so all kinds of mould structure be quite different, it is not possible in the market can buy, can not be mass production. It is only possible for single production, in particular factory and, the life of the mold are longer, the possibility to repeat manufacturing mold is very small, therefore, the manufacturing cost is higher mold.
  3.short production cycle. The current fierce competition, whose products can first put on the market, there may be seized opportunities, therefore, each manufacturer all are minute, early on the market for products and make every effort, which requires the injection mold design, manufacturing, production from both try to shorten the time, requirements of the production cycle as short as possible in order to seize the market, seize the benefits.
  4.high technological content. Injection molding products have very complex shape, size, accuracy requirements are very high, which is the main components, which brings great difficulty to the design and manufacture of injection mold, mold manufacturing to timely put out, must put the veteran soldiers and able captains, must focus on mechanical design of cash.