Injection mold manufacturing has five distinct characteristics
1. The cavity and core present vertical body surface.
Plastic parts of external and internal shape is formed directly by the cavity and core, these complex multiple-layered surface processing difficulty is bigger, especially within the blind groove cavity forming surface processing, using traditional machining method, not only requires workers technical level is high, the auxiliary fixture, cutting tools, and processing cycle is long.
2. High requirements for precision and surface quality and long service life.
At present, the dimension accuracy of general plastic parts is required to be it6-7, with the surface roughness ra0.2-0.1 displacement m. The dimension accuracy of the corresponding injection mold parts is required to be it5-6, and the surface roughness is less than Ra0.1 displacement m.The roughness of the record surface of the laser disc should reach the level of 0.02 to 0.01 mm, which requires the surface roughness of the mold to be below 0.01 mm.
Long life injection moulds are necessary to improve efficiency and reduce cost. At present, the service life of injection moulds generally requires more than 1 million times.For precision injection moulds, a rigid formwork should be used to increase the thickness of the formwork and the thickness of the supporting column or tapered positioning element to prevent deformation of the moulds under pressure. Sometimes the internal pressure can be up to 100MPa.The ejection device is an important factor affecting the deformation and dimensional accuracy of the product.Most of the high-precision injection moulds adopt inlay or full structure in the structure, which requires the machining accuracy and interchangeability of the parts of the moulds to be greatly improved.
3. Long process and tight manufacturing time.
Luo baihui, a mold expert, thinks that for injection parts, most of them are complete products with other parts, and in many cases, they are completed in other parts, eagerly waiting for the injection parts.Because of the high demand for the precision of the shape or size of the products, and because of the different properties of the resin materials, the mold manufacturing after the completion of repeated testing and modification, so that development and delivery time is very tight.
4. Long-distance design and long-distance manufacturing.
Mold making is not the ultimate goal, but the final product design is proposed by the user. Mold manufacturers design and manufacture the mold according to the user's requirements, and in most cases, the product injection production is also in other manufacturers.In this way, the product design, mold design and manufacture and production of products are carried out in different places.
5. Professional division and dynamic combination.
The mold production batch is small, generally belongs to the single-piece production, but the mold needs a lot of standard parts, big to the formwork, small to the thimble, these cannot and cannot be completed by a single manufacturer alone, and the manufacturing process is complex, the common equipment and the numerical control equipment use is extremely unbalanced.