Micro gear is often used in small gear box, robot toys, mobile phone lift camera, and so on. MIM is replacing traditional processes such as hobbing and powder metallurgy to manufacture the micro gear.
Metal injection molding (MIM) is a metalworking process by which finely-powdered metal is mixed with a measured amount of binder material to comprise a “feedstock” capable of being handled by plastic processing equipment through a process known as injection molding. The molding process allows dilated (oversized due to binder) complex parts to be shaped in a single step and in high volume. After molding, the powder-binder mixture is subjected to steps that remove the binder (debinding) and sinter densify the powders. End products are small components used in various industries and applications.
The types of molds used in micro-gears are usually three-plate molds for cold runners, and three-plate molds for hot runners. The structure of helical gear molds is more complicated, and requires a special mold ejection mechanism. Generally, cylinders are used for ejection, and the ejection speed is required during commissioning. Appropriate, so as not to hurt the product, the mold should be maintained and maintained in time.