Tue Oct 25 14:37:39 CST 2022
All kinds of tools and products used in our daily production and life, from the base of machine tools and machine shells to a small embryonic head screw, button and the shell of various household appliances, all have a close relationship with the mold. The shape of the mold determines the shape of these products, and the processing quality and precision of the mold also determines the quality of these products. Because of the different materials, appearance, specifications and uses of various products, the moulds are divided into non-plastic moulds such as casting moulds, forging moulds, die-casting moulds, stamping moulds, and plastic moulds.
In recent years, with the rapid development of the plastics industry and general and engineering plastics in terms of strength and precision continue to improve, the scope of application of plastic products is also expanding, such as: household appliances, instruments, construction equipment, automotive industry, daily hardware and many other fields, the proportion of plastic products is rapidly increasing. A reasonably designed plastic parts can often replace multiple traditional metal parts. The trend of plasticization of industrial products and daily-use products is increasing.
The general definition of mold: In industrial production, using a variety of presses and special tools mounted on the press, through the pressure of metal or non-metallic materials to make the required shape of parts or products, this special tool is collectively known as the mold.
Description of injection molding process:A mold is a tool for producing plastic products. It consists of several groups of parts, and this combination contains the molding cavity. During injection molding, the mold is clamped on the injection molding machine, the molten plastic is injected into the molding cavity and cooled and shaped in the cavity, then the upper and lower molds are separated and the product is ejected from the cavity and leaves the mold through the ejector system, and finally the mold is closed again for the next injection, the whole injection molding process is cyclic.
A. Injection molding mold - TV casing, keyboard buttons, electronic products outside, computer peripheral plastic products, toys, household products (the most common application)
B. Blow mold - beverage bottles
C. Compression molding mold - Bakelite switch, scientific porcelain dishes
D.Transfer molding die - integrated circuit products
E.Extrusion mold---glue tube, plastic bag
F.Thermoforming mold--transparent molding packaging shell
G.Rotational molding mold - soft rubber doll toys
According to the different types of pouring system, the molds can be divided into three categories:
(1) Large spout mold: the runner and gate are on the parting line, and the product is demolded together when the mold is opened, the design is the simplest, easy to process, and the cost is low, so more people use the large spout system to work.
(2) Fine spout mold: the runner and gate are not on the parting line, generally directly on the product, so to design more than one group of spout parting line, the design is more complicated, processing is more difficult, generally depending on the product requirements and choose fine spout system.
(3) hot runner mold: the structure of this kind of mold and fine water mouth is largely the same, the biggest difference is that the runner is in one or more hot runner plate and hot water mouth with constant temperature, no cold material demold, runner and gate directly on the product, so the runner does not need to be demolded, this system is also called no water mouth system, can save raw materials, suitable for raw materials are more expensive, products require high situation, design and processing difficulties, mold Higher cost.