Plastic mold processing refers to the processing of plastic molding and plastic blanking tools. It consists of an upper mold and a lower mold. Its basic characteristics are as follows:

　　(1) High machining accuracy requirements

　　 A pair of molds is generally composed of a female mold, a convex mold and a mold base, and some of them may also be multi-piece modular modules. Therefore, the combination of upper and lower molds, the combination of inserts and cavities, and the assembly of modules require high machining accuracy. The dimensional accuracy of precision molds often reaches the μm level.

　　(2) Complex shape and surface

　　Some products, such as car covers, aircraft parts, toys, and household appliances, have a surface that is composed of a variety of curved surfaces. Therefore, the mold cavity surface is very complicated. Some curved surfaces must be processed by mathematical calculation methods.

　　(3) Small batch

　　 The production of molds is not mass production, and in many cases only one pair is produced.

　　(4) Many processes

　　 Various processes such as milling, boring, drilling, reaming and tapping are always used in mold processing.

　　(5) Repeated production

　　The use of molds has a long life. When the use of a pair of molds exceeds its life, a new mold must be replaced, so mold production is often repetitive.

　　(6)Profiling processing

　　There are sometimes neither patterns nor data in mold production, and it is necessary to perform profiling processing according to the actual object. This requires high imitation accuracy and no deformation.

　　(7) Excellent mold material, high hardness

　　The main material of the mold is mostly made of high-quality alloy steel, especially the long-life mold, which is often made of Crl2, CrWMn and other ledeburite steel. This type of steel has strict requirements from blank forging, processing to heat treatment. Therefore, the preparation of processing technology cannot be ignored, and heat treatment deformation is also a problem that needs to be taken seriously in processing.

　　 Understand the basic characteristics of plastic mold processing, and choose the machine tool to meet the processing requirements as much as possible. For example, the function of the CNC system should be strong, the precision of the machine tool should be high, the rigidity should be good, the thermal stability should be good, and it has the function of profiling.