Compared with other types of molds such as stamping die […]
Compared with other types of molds such as stamping dies and die-casting dies, there are five obvious characteristics of injection mold manufacturing. The analysis is as follows:
1. The cavity and core are three-dimensional.
The outer and inner shape of the plastic part is directly formed by the cavity and the core. These complicated three-dimensional surface processing is more difficult, especially the blind hole type inner molding surface processing of the cavity, if the traditional processing method is used, Workers are required to have high technical level, many auxiliary fixtures, many tools, and long processing cycles.
2. High precision and surface quality requirements, long service life requirements.
At present, the dimensional accuracy of general plastic parts is IT6-7, the surface roughness is Ra0.2-0.1μm, and the dimensional accuracy of the corresponding injection mold parts is required to reach IT5-6, and the surface roughness Ra is less than 0.1μm. The roughness of the recording surface of the laser disk should reach 0.02-0.01 μm of the level of mirror processing, which requires the surface roughness of the mold to be less than 0.01 μm. Long-life injection molds are necessary to improve high efficiency and reduce costs. At present, the service life of injection molds generally requires more than 1 million times. Precision injection molds use a rigid mold frame, increase the thickness of the template, increase the support column or tapered positioning elements to prevent deformation of the mold after pressure, sometimes the internal pressure can reach 100MPa. The ejector device is an important factor affecting the deformation and dimensional accuracy of the product, so the best ejector point should be selected to make the mold release evenly. Most of the high-precision injection molds are inlaid or fully assembled in the structure, which requires the processing precision and interchangeability of the mold parts to be greatly improved.
3, long process flow, tight manufacturing time.
For injection molded parts, most of them are matched with other parts to form a complete product, and in many cases, other parts have been completed, and eagerly awaiting the listing of injection molded parts. Because the shape or dimensional accuracy of the product is very high, and because the characteristics of the resin material are different, after the mold is manufactured, it is necessary to repeatedly try and correct the mold, so that the development and delivery time is very tight.
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4, off-site design, off-site manufacturing.
Mold manufacturing is not the ultimate goal, but the final product design is proposed by the user. The mold manufacturer designs and manufactures the mold according to the requirements of the user. In most cases, the injection production of the product is also in other manufacturers. This results in the design of the product, the design and manufacture of the mold, and the production of the product at different locations.
5, professional division of labor, dynamic combination.
The mold production batch is small, generally belongs to the production of single piece, but the mold needs a lot of standard parts, from the mold base to the small thimble. These can not and cannot be completed by only one manufacturer, and the manufacturing process is complicated, common equipment and numerical control. Equipment usage is extremely uneven.