Our daily production, life in the use of a variety of tools and products, as large as the base of the machine tool, the body shell, as small as an embryo head screws, buttons, and a variety of household appliances shell, all have a close relationship with the mold. The shape of the mold determines the shape of these products, mold processing quality and precision also determines the quality of these products. Because of the material of various products, appearance, specifications and different uses, the mold is divided into a casting mold, forging mold, die-casting mold, stamping mold and other non-plastic molds, as well as plastic molds.
1, in recent years, with the rapid development of the plastics industry and general-purpose and engineering plastics in terms of strength and precision and other aspects of the continuous improvement of the scope of application of plastic products is also expanding, such as: household appliances, instruments, construction equipment, automotive industry, daily-use hardware and many other areas, the proportion of plastic products is increasing rapidly. A reasonably designed plastic parts can often replace a number of traditional metal parts. The trend of plasticization of industrial products and daily-use products is rising.
2, the general definition of the mold: in industrial production, with a variety of presses and mounted on the press on the special tools, metal or non-metallic materials through the pressure to produce the required shape of the parts or products, the special tools collectively referred to as molds.
3, injection molding process description: mold is a tool for the production of plastic products. It is composed of several groups of parts, this combination of molding cavity. Injection, the mold clamped on the injection molding machine, molten plastic is injected into the molding cavity, and in the cavity cooled and shaped, and then the upper and lower molds are separated, by the ejector system will be products from the mold cavity ejected from the mold, and finally the mold is closed for the next injection, the entire injection molding process is cyclic.
4, (1) mold line, with the product in the mold opening together with the mold, the design is the most simple, easy to process, the cost is low, so more people use the large spout system operation. ( 2) fine spout mold: runners and sprues are not in the mold line, generally directly on the product, so to design more than one set of spout mold line, the design is more complex, processing is more difficult, generally depending on the product requirements and the choice of fine spout system. ( 3) Hot runner mold: the structure of such molds and fine spout is basically the same, the biggest difference is that the runners are in
one or more thermostatic hot runner plate and hot kiki-nozzle, no cold material demolding, runner and gate directly on the product, so the runners do not need to be demolded, the system is also known as the system of no spout, can save raw materials for raw materials are more expensive, the product requirements of the case of a high degree of design and processing difficulties, mold cost is higher. Processing difficulties, mold cost is higher.