(1) Processing accuracy requires a high pair of molds are generally composed of die, convex mold and mold frame, some may also be a number of flattening modules. So the combination of upper and lower molds, the combination of paneling and cavity, the flattening between modules requires a high processing accuracy. The dimensional accuracy of precision molds is often up to a class of ?m.
(2) Complex some products such as car covering parts, aircraft parts, toys, household appliances, the shape of the surface is composed of a variety of surfaces, therefore, the mold cavity surface is very complex. Some surfaces must be processed mathematically.
(3) The production of small-volume molds is not large-volume mass production, in many cases often only one payment.
(4) The operation of multi-mold processing is always to use milling, boring, drilling, articulation and threading and other operations.
(5) The use of repetitive production molds is life-long. When the use of a pay mold beyond its life, it is necessary to replace the new mold, so the production of mold softens.
(6) The imitation processing mold production sometimes has no pattern, no data, and according to the physical imitation processing. This requires high imitation accuracy and no deformation.
(7) Mold material excellent, high hardness mold of the main materials are made of high-quality alloy steel, especially high-life molds, often using Crl2, CrWMn and other Leishi steel manufacturing. This type of steel from rough forging, processing to heat treatment have strict requirements. Therefore, the preparation of processing technology is more important to ignore, heat treatment deformation is also a serious problem in processing.
According to the above characteristics, in the selection of machine tools to meet the processing requirements as far as possible. Such as numerical control system function should be strong, machine tool accuracy should be high, rigid ity is better, thermal stability is better, with the shape function.