What is a brief understanding of injection mold design?
Plastic injection mould is the most widely used plastic mould, which can form complex and high precision plastic products.
When designing a mold for a product, the basic structure size of the mold should be set first to prepare the material, so as to speed up the mold manufacturing.For complex products, the product diagram should be drawn first, and then the size of the mold should be determined.Nowadays, the molds should be heat treated to improve the hardness and service life of the molds.Before heat treatment to preliminary processing of template, good guide pin holes, return hole (dynamic mode), cavity hole, the screw hole, gate set of holes (static), pull hole (dynamic mode), cooling hole, milling good runner, cavity, some mold should also be good milling oblique guide box, etc.The current common precision mold template generally USES Crl2, Cr12MoV and some professional mold steel, Cr12 and other hardness cannot be too high, often cracking at 60HRC, the common hardness of the template is generally around 55HRC.The hardness of the core can be over 58HRC.If the material is 3Cr2W8V, the surface hardness of the nitriding treatment after manufacturing shall be over 58HRC, and the thicker the nitriding layer, the better.The gate is directly related to the beauty of the plastic parts.It is easy to produce a serpentine flow without any obstruction.For high - demand products, overflow and exhaust should also be designed.Overflow can be used in the top rod, do not leave overflow flying edge on the template, so as not to affect the die life.There are also more and more software for designing molds, most of which have little use for pencil drawing.When designing, without product drawing, it is difficult to give full play to the advantages of software drawing in the more complex mold drawing.After the product drawing is finished, the bottom is saved, and then the size drive or scaling is used to generate the production graphics.In addition, the preservation of drawings is also important.
Mold cooling system for the control of mold temperature, improve the quality of products, shorten the molding cycle, and save energy consumption has a direct impact, so the reasonable design of mold cooling system is very important.
According to the shape of the product, people design the inlet and outlet circuit of cold water or hot water in different templates, especially near the mold core, the cavity and the injection channel.
The following factors should be taken into account in the design of mould cooling system: mould steel type, length of cooling channel, melting temperature and solidification temperature of injection material.Temperature control device should also be considered at the same time, the cooling medium flow and pressure, thus according to processing conditions to the mold to absorb heat and cooling water pipe should be take away heat for heat balance computation design cooling system.Studies have shown that good cooling design can reduce cooling time by about 20 percent.