The difference between precision molds and ordinary molds is mainly reflected in the accuracy. The key dimensions of many precision molds are not allowed to have inclination, but the tolerance zone is generally used to add a small inclination when making molds, such as gear mounting posts. When building a digital model, you must pay attention to the adjustment of the tolerance. Generally, the 3D model provided by the customer is useless, because many of his dimensions are the limit size. If you design the mold according to this, the mold will basically be made. Scrapped.
Secondly, the drawings must be comprehensive, complete and accurate, use inserts as much as possible, consider processing more, and rely on machines to ensure the relevant dimensions as much as possible (the role of the fitter master's technology in precision plastic molds is to strictly follow the drawings). Most of the mold parts are subject to strict design tolerances, not only the working parts of the cavity and core, but also the dimensions related to the installation position of all inserts must be strictly limited. Generally controlled at plus or minus 0.005. So we must pay attention to these issues when designing.