(1) the mold processing precision requirements are high: a mold is generally composed of concave die, punch die and die frame, some may also be a multi-piece assembly module. Therefore, the combination of upper and lower die, the combination of inserts and cavity, and the assembly between modules all require high machining accuracy. The dimensional accuracy of precision die is often up to μm.
(2) the shape surface is complex: some products such as car cover parts, aircraft parts, toys, household appliances, the shape of the surface is composed of a variety of curved surface combination, therefore, the mold cavity surface is very complex. Some surfaces must be dealt with mathematically.
(3) small batch: the production of the mold is not a large batch production, in many cases often only produce a pay.
(4) many processes: always used in mold processing milling, boring, drilling, reaming and tapping and other processes.
(5) Repeatable production: the use of the mold has a long life. When a mold is used beyond its life, it is necessary to replace a new mold, so the production of the mold is often repetitive.
(6) profiling mold processing: sometimes there is no pattern, no data in mold production, and according to the real kind of profiling processing. This requires high imitation accuracy, no deformation.
(7) Mold material is excellent, high hardness: the main material of the mold is mostly made of high quality alloy steel, especially the high life mold, which is often made of leistenite steel such as CrL2 and CrWMn. This kind of steel from blank forging, processing and heat treatment have strict requirements. Therefore, the establishment of mold processing technology can not be ignored, 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. For example, the function of CNC system should be strong, the accuracy of machine tools should be high, the rigidity is better, the thermal stability is better, and the profiling function is better.