Effectively prolong the life of cosmetics packaging production mold

With the constant improvement of the industrial automation level, the more the more widely used. But at present many enterprises in our country, the service life of mould is still relatively low, into the equivalent of 1/3 ~ 1/5. Working parts of die life is low, poor accuracy stable, will not only affect the quality of the product, and will cause the mould in serious waste of materials, processing time and cost, greatly increase the cost of product and reduce the production efficiency, serious impact on the competitiveness of the products. Research has shown that the service life of mould and inappropriate improper heat treatment, material selection, mold structure is not reasonable, unreasonable mechanical processing technology, mould lubrication is not good, and poor design level of many factors. According to the analysis of the die for large failure statistics, in the cause of die failure factors, the improper heat treatment accounted for about 45%, improper material selection, mold structure is not reasonable account for about 25%, process problems accounts for about 10%; Lubrication problem, equipment factors accounted for about 20%. Therefore, in the mold design and manufacturing process, choose appropriate material, the reasonable die structure design, selection and reasonable heat treatment process, the processing technology of the mould the parts shall be properly arranged route, improve the mould working conditions are conducive to improve the mould quality and service life. Reasonable choice mold material 1. 1 the principle of reasonable mould structure mould design is to ensure sufficient strength, stiffness, concentricity, to neutral and reasonable blanking clearance, and reduce stress concentration, to ensure that the mold to produce parts meet the design requirements. So the main work zero of mould ( Such as convex and concave die of punching die, injection mold dynamic and fixed mold, stamping die, lower die, etc. ) Require the guidance of high precision, good concentricity and neutral and blanking clearance is reasonable. In the mold design, should be considered are: (1) punch design must pay attention to the support and to guide the protection. Especially when design holes punch with their guide structure, can extend the life of the mold. (2) the Angle, narrow slot, such as weak positions, in order to reduce the stress concentration, with circular arc transition, arc radius R may take 3 ~ 5 mm. (3) for complex structure of die structure of set spell, also can reduce stress concentration.

1。 2 choose mold material selection of die material, should according to different production batch, process method and process of object selection. In mass production, should choose long life of the die material, such as cemented carbide, Gao Qiangren, high wear-resistant steel ( Such as YG15, YG20) ； Can be used for small batch or new product production mold material such as zinc alloy, tin bismuth alloy; For easy to deformation, easy to fracture failure of the general mold, need to choose the material with high strength and high toughness ( T10A) ； Hot forging die are should choose good toughness, strength, mould resistance and resistance to cold and hot fatigue properties of the materials ( Such as CRM - 5 nMo) ； Die mold to adopt high thermal fatigue resistance, high temperature and high strength alloy steel ( Such as 3 cr2w8v) ； Plastic mould, should choose free-cutting, compact structure and good property of polishing materials. In addition, in the design of punch and die, appropriate chooses different hardness or mold matching of different materials, such as: punch tool steel ( Such as T10A) And die with high carbon high chromium steel ( Such as Cr12, Cr12MoV) , the service life of the mold can improve the 5 ~ 6 times.