Precision injection molding is mainly distinguished from "conventional injection molding". With the rapid development of polymer materials and microelectronics technology, electronic circuits are highly integrated, and industrial equipment parts are gradually developed into high-performance, high-precision, lightweight, Miniaturization and miniaturization. Such precision plastic parts have been widely used in mechanical, electronic, communication, automotive and other industries to replace some high-precision metal parts because they meet the requirements of high precision and have good mechanical, mechanical and dimensional stability.

According to the definition of precision injection molding, the dimensional tolerance range of precision plastic parts is very narrow. In fact, it is recognized in the plastic molding industry that when the dimensional tolerance of plastic parts is less than 0.1mm, or the positive and negative tolerances of the parts are below 0.1mm, it can be called precision molding, and the dimensional tolerance of the parts is up to micron. Grade, can be called ultra-precision injection molding.

In terms of precision injection molding, the dimensional tolerance of common injection molded parts is usually above 0.1mm, the dimensional tolerance of the parts is relatively wide, and the dimensional tolerance of the parts will increase with the increase of the volume or weight of the parts. Increased. It is worth mentioning that due to the nature of the material itself and the processing methods, the accuracy of the plastic parts cannot be equated with the precision of the metal parts. The higher precision grade of plastic products is three-level precision, that is, the dimensional tolerance can be up to 0.001mm, while the metal parts can be divided into fourteen levels, and the machining accuracy is divided into nine levels.