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The key to precision plastic mold processing

source:admin Release date: 2019-03-19 Click:
1. In terms of molds, the need for precision injection molding equipment for micro-injection molding is much higher than traditional injection molding:
There are two general trends in micro-injection processing in mold processing: the first one is the use of mirror-emission machining. In order to ensure the high precision of precision mold processing, it is best to use graphite electrodes for EDM because the loss of graphite electrode is higher than that. The copper electrode is much smaller. The second common method of comparison is to use electroforming molds. The electroforming technology can guarantee very high precision, but the defects are long processing cycles, each hole must be processed independently, and if there is slight damage in production, it cannot be corrected. Only damaged acupuncture points can be replaced from the beginning.
2. In terms of mold, mold temperature is also a very important parameter for micro injection molding. For customers facing high-end needs, the current common practice is to introduce the rapid heating and cooling system by borrowing the concept of high-gloss injection molding:
In theory, high mold temperature is very helpful for micro-injection. For example, it is difficult to avoid thin-wall filling and lack of material. However, too high mold temperature will bring new questions, such as lengthening the cycle and shortening the deformation after mold opening. Therefore, it is important to introduce a new mold temperature control system. During the injection molding process, the mold temperature can be improved (beyond the melting point of the plastic used), so that the melt can quickly fill the cavity and avoid the temperature drop of the melt during the filling process. Too fast to form a filling defect; and when demolding, the mold temperature can be agilely lowered, kept at a temperature slightly lower than the plastic heat distortion temperature, and then the mold is ejected.
In addition, because the micro-injection molding is a product with a mass of milligrams, if a general casting system is used to inject the product, even after the optimization and improvement, the mass ratio of the material in the product and the casting system is still 1: 10. As long as less than 10% of the material is injected into a micro-product, many casting system aggregates occur, so the micro-injection is probably a warm runner casting system.

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