What is injection molding precision machining? Precision injection molding means that the appearance accuracy of injection molded products should meet strict dimensional tolerance, geometric tolerance and surface roughness. There are many related conditions for precision injection, and the essence is the four basic factors: plastic material, injection mold, injection process and injection equipment.

Precision injection molding refers to an injection molding method in which the dimensional repetition accuracy of injection molded products is so high that it is difficult to meet the requirements by using general injection molding machine and conventional injection molding process. The concept of "precision injection molding" is mainly different from "conventional injection molding". It is based on the rapid development of polymer materials and the technology of using precision plastic parts to replace high-precision metal parts in the field of instruments and electronics.

In precision injection molding, the mold is one of the keys to obtain precision plastic products that meet the quality requirements. The mold for precision injection molding should really meet the requirements of product size, accuracy and shape. However, even if the precision and size of the mold are consistent, the actual size of the molded plastic products will be inconsistent due to the difference of shrinkage. Therefore, it is very important to effectively control the shrinkage of plastic products in precision injection molding technology.

Engineering plastics for precision injection molding must choose materials with high mechanical properties, stable size, good creep resistance and environmental stress cracking resistance. Secondly, the applicable injection molding machine shall be selected according to the selected plastic materials, dimensional accuracy of finished products, piece weight, quality requirements and expected mold structure.