This is some of the plastic parts we customise for our customers. At the same time we can also customize other dispenser plastic parts! For example: water dispenser housing, smart seat, water box, faucet, panel, rear cover.
About plastic mold design
The plastics industry is one of the modern emerging industries. It includes the production of plastic raw materials (resins and auxiliaries) and molding of plastic products. Because plastics have the advantages of small specific gravity, good chemical stability, high electrical insulation performance, and large specific strength, they are widely used in machinery, instruments, radio, telecommunications, daily necessities, defense, and advanced science and technology. The injection mold is mainly used for the molding of thermoplastic plastic products. The mold itself does not have a feeding chamber, and the plastic is added to a heating barrel having a predetermined temperature in the injection machine. The plastic is heated to convert into a flowable melt, which is driven by the screw or piston of the injection machine at a certain pressure and speed. It is injected into the closed mold cavity through the injection nozzle of the injection machine and the casting system of the mold and cooled for a certain period of time. Hardened to obtain the desired shape of plastic products. This molding method is called plastic injection molding, and the mold used is called injection mold. With the development of the plastics industry, injection molding has been used for thermosetting plastic molding but the mold used has its own characteristics. Plastic injection molds are the most widely used molds in all plastic molds and can form complex, high-precision plastic products. This article is only a brief introduction. The design of plastic injection molds must first have a certain understanding of plastics. The main component of plastics is polymers. As we often say, ABS plastics are acrylonitrile, butadiene, and styrene. The three monomers are produced by emulsion, bulk or suspension polymerization, which gives them the superior properties and moldability of three monomers. The temperature and pressure are injected into the mold cavity, resulting in flow deformation, to obtain the shape of the cavity, and after extrusion cooling, the plastic product is ejected. Polymer molecules generally have a chain structure, and linear molecular chains and branched molecules are considered as thermoplastics, and can be repeatedly heated and cooled, and a plurality of molecules are heated to undergo a cross-linking reaction to form a network-like molecular structure. Plastics are usually of a time and cannot be repeatedly processed by injection, ie thermosetting plastics. Since it is a chain structure, the direction of shrinkage of the plastic during processing is also related to the orientation of the polymer chains under stress and the cooling contraction, and the contraction in the flow direction is more than that in the vertical direction. Product shrinkage is also related to the shape of the product, gate, thermal expansion and contraction, temperature, pressure holding time and internal stress and other factors. In general, the book provides a wide range of shrinkage. In practical applications, consideration is given to the product’s wall thickness, structure, and the size and orientation of the temperature pressure during injection molding. If there is no core support for the general product, the shrinkage is correspondingly larger. Plastic injection mold is basically divided into static mold and dynamic mold. The sprue bushing on the side of the injection head of the injection molding machine is a static mold. The static mold generally consists of a sprue bushing, a back plate, and a template. A simple mold (especially a mold without a core in a static mold) may not use a back plate. , use a thick template directly on it. Sprue bushings are generally standard parts and are not recommended for cancellation unless for special reasons. The use of sprue bushings facilitates the installation of molds and the ease of replacement without the need for self-polishing. Some special mold sprue bushes can be drilled or cut with a taper line. When some molds must be released from the mold, the static mold release mechanism must be added.
The structure of the moving mold is generally a moving platen, a moving plate, a stripping mechanism, and a die leg and a mounting plate. . In the demoulding mechanism, in addition to the stripper rod and the return rod, some molds also need to increase the spring to achieve functions such as automatic stripping. There are pillars, cooling water holes, runners, etc., which are indispensable basic structures of the mold. Of course, oblique guide molds also have oblique guide boxes, inclined guide posts, and so on. When designing a mold for a product, it is first necessary to set the basic structure size of the mold to prepare materials to speed up the mold manufacturing. Complex products should first draw a good product map, and then set the size of the mold. The current molds are basically heat treated, increasing the hardness of the molds and increasing the service life of the molds. Before the heat treatment, the template is first processed: drilling the guide post hole, return hole (moving mold), cavity hole, screw hole, gate sleeve hole (static mold), feeding hole (moving mold), cooling Water holes, etc., Milled runners, cavity, some molds should also be milled into a diagonal guide box. Now the general precision mold template generally uses Cr12, Cr12Mov and some professional mold steel, Cr12 and other hardness can not be too high, crack often in HRC60 degrees, the common hardness of the template is generally about HRC55 degrees. The hardness of the core can be above HRC58. If the material is 3Cr2W8v, the hardness of the surface after nitriding treatment is to be more than HRC58, and the nitriding layer should be as thick as possible. The gate is directly related to the appearance of the plastic parts. If the gate design is not good, defects may easily occur. Snake flow is easily generated without any blockage. For demanding products, overflows and exhausts should also be designed. Overhead can be used in the overflow, do not leave overflow flash on the template, it will not affect the die life. The clamping force of an existing injection molding machine is proportional to the area of the installation tool table. Correspondingly, the large-tonnage injection force injection mold can also be installed with a large closing height. When molding flat plastic parts, the projected area of the plastic parts is often large, but the required clamping force is small. In order to make full use of the injection molding machine clamping force, laminated molds can be used. This type of mold contains two layers of cavities that can be removed from the two parting surfaces when demoulding. This will allow this to double production. Because the plastic part is flat, even if it is designed as a two-layer cavity, the height of the mold will not exceed the allowable closing height of the injection machine. Another advantage of this type of mold is that it can mold matching plastic parts simultaneously in a pair of molds to achieve a precise fit. With the development of hydraulic technology, the hydraulic system has been widely used in various industries with its good controllability and stable output performance. In the current four major types of transmission methods (mechanical, electrical, hydraulic, and pneumatic), hydraulic transmissions are increasingly being used due to their unique technological advantages in terms of power-to-weight ratio, stepless speed regulation, automatic control, and overload protection. Designed and used by producers. In the mold manufacturing industry, the removal of the fully automatic thread-pulling core system has been difficult to solve, and the traditional motor drives often cause thread strain because of unstable performance and unrestricted limits. This paper takes a pure water machine filter cover as an example to introduce the low-speed and large-torque cycloidal hydraulic motor thread release mechanism. This mechanism inherits the advantages of traditional molds, and also greatly improves the shortcomings of traditional molds. It can not only guarantee the automatic production of molds, but also guarantee the high precision and high quality of products, and maintain the stability of product functions.
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Over 15 years of experience in injection molding and plastic mold manufacturing industries. More than 30 8-year-plus operators have developed tailor-made plastic product development solutions to create what you really want!
Constantly update the advanced equipment introduced into the industry, plus or minus 0.02mm tolerance precision molds, imported high-speed injection molding machines to complete the processing of injection molding products that are not comparable to ordinary injection molding machines.
Application of auto parts, medical cosmetology equipment, electronic appliances, toys, industrial accessories, household appliances and other fields; Wuling Po Chun, Vanke Real Estate, Lanshen Fresh Air System, Songfeng Co., Ltd., Four Seasons Mu Ge, Jiaotong University, China Railway, etc. Business supplier.
Preferred NAK80, S136 die steel, up to 50-100 million die life.
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