(1) The precision of die machining is high. The auxiliary mouldis generally composed of a concave mold, a convex mouldand a mouldframe, and some may also be a multi-piece assembly module. Therefore, the combination of the upper and lower molds, the combination of the insert block and the cavity, and the combination between the modules require high processing accuracy. The dimensional accuracy of precision molds often reaches the μm level.
(2) Complex shape and surface For some products such as automobile covers, aircraft parts, toys, and household appliances, the shape of the surface is composed of a variety of curved surfaces, so the mouldcavity surface is very complicated. Some surfaces must be processed with mathematical calculations.
(3) Small batches The production of molds is not mass production in batches, and in many cases only one production is usually paid.
(4) Multiple processes Various processes such as milling, boring, drilling, reaming and tapping are always used in mouldprocessing.
(5) Repeatable commissioning The use of molds has a long life. When the use of a set of molds exceeds its life, new molds must be replaced, so the production of molds is often repeatable.
(6) Copy processing In mouldproduction, sometimes there are neither drawings nor data, and copy processing is carried out according to the actual product. This requires high copy accuracy and no deformation.
(7) The mouldmaterial is excellent and the hardness is high. The main material of the mouldis mostly made of high-quality alloy steel, especially the mouldwith a long life, and it is often made of Crl2, CrWMn and other laisenite steel.treatment. Therefore, the preparation of processing technology can not be ignored, and heat treatment deformation is also a problem that needs to be taken seriously in processing.
According to the above-mentioned many characteristics, the machine tool should meet the processing requirements as much as possible. For example, the function of the numerical control system is stronger, the precision of the machine tool is higher, the rigidity is better, the thermal stability is better, and the copy function is provided.