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Difficult to manufacture injection molds? May be caused by t

source:admin Release date: 2020-07-11 Click:
The cavity and core are three-dimensional profiles.
The external and internal shapes of the plastic parts are directly formed by the cavity and the core. These complex three-dimensional profiles are more difficult to process, especially the blind cavity inner molding surface of the cavity. If the traditional processing method is used, not only Workers are required to have a high technical level, many auxiliary jigs and tools, and a long processing cycle.
High precision and surface quality requirements and long service life requirements.
At present, the dimensional accuracy requirements of general plastic parts are IT6-7, and the surface roughness Ra0.2-0.1μm, and the corresponding dimensional accuracy requirements of injection mold parts reach IT5-6, and the surface roughness Ra0.1μm or less.
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 reach 0.01 μm or less. 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 need to use a mold frame with high rigidity, increase the thickness of the template, increase the support column or tapered positioning element to prevent the mold from deforming after being pressed, and sometimes the internal pressure can reach 100MPa.
The ejection device is an important factor that affects the deformation and dimensional accuracy of the product, so the best ejection point should be selected to make the demolding uniform everywhere. Most high-precision injection molds are inlaid or fully assembled in structure, which requires that the processing accuracy and interchangeability of mold parts are greatly improved.
Long process flow and tight manufacturing time.
For injection molded parts, most of them are completed with other parts to form a complete product, and in many cases, other parts have been completed, eagerly waiting for the matching of injection molded parts to market. Because of the high requirements on the shape or dimensional accuracy of the products, and due to the different characteristics of the resin material, after the mold is completed, it is necessary to repeatedly try and correct the mold, which makes the development and delivery time very tight.
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 user's requirements. In most cases, the injection production of the product is also produced by other manufacturers. This has caused the situation of product design, mold design and manufacture and product production going on in different places.
Professional division of labor, dynamic combination.
The production volume of the mold is small, generally belongs to the production of a single piece, but the mold requires a lot of standard parts, ranging from the mold frame to the thimble. These cannot and cannot be completed by only one manufacturer, and the manufacturing process is complicated, common equipment and CNC The use of equipment is extremely uneven.

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