Why do the inserts in metal insert injection molding need to be heated?

Metal insert injection molding is a process for adding metal parts to injection molding production, and is mainly used in the electronics industry. Generally speaking, metal inserts are heated before injection molding. Why? Precision-10 years of experience in custom injection molding of inserts, to answer this question. Inserting metal inserts in injection molded products is to better improve the working strength of plastic products and enhance the application of the product (such as improving electrical conductivity or convenient connection with other parts, etc.). Because the thermal characteristics and shrinkage rate of metal inserts and plastics are very different, the temperature of the wear-resistant material injected into the cavity of the forming mold decreases very quickly at the periphery of the metal material inserts, causing stress to the nearby plastics. , When it is more serious, cracks will continue to appear, reducing the firmness of the connection between the two pieces. In order to better adjust the temperature of the metal insert and the temperature when the plastic is injected, the temperature difference between the two pieces when they are embedded is reduced. The insert must be heated and raised before forming with the wear-resistant material. The heating temperature is generally 110. ℃ above. For metal inserts with small diameters, the temperature of injecting wear-resistant materials will quickly heat them, so it is generally not necessary to carry out heating to solve the problem. [Related recommendation] Learn more: Call of precision stamping parts manufacturers Learn more: Comparison of insert injection molding and post-injection assembly Understanding details: What to do if the insert leaks in the injection molded product