The direct molding method can use different materials in different parts according to requirements. However, the direct molding method is limited by the process itself, and the manufactured mold cannot meet the requirements of high-precision metal molds in terms of surface and dimensional accuracy, size, and shape freedom. The competitive rapid molding method is mainly an indirect molding method that combines rapid prototyping with traditional molding processes such as casting, spraying, electroplating, and powder molding. There are several methods for indirect molding.
1.Epoxy resin mold
The production process is similar to the silicone mold production process, except that the silica gel is replaced with an epoxy resin doped with aluminum powder. The entire mold needs to be cast in two parts because the epoxy resin cannot be cut and cut like a silicone. The epoxy resin is accompanied by a small amount of shrinkage during the curing process, so the master mold is often damaged. The thermal conductivity of epoxy resin is extremely poor, and the heat generated by injection molding using a mold made of pure epoxy resin is difficult to dissipate. The solution is to make the surface of the mold of epoxy resin, and the back is filled with a material with good thermal conductivity. The mold thus produced has a good compressive strength and can be used for pressure forming like injection molding, and the abrasive material can also be injection molded, and the service life is several thousand pieces.