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      1. 歡迎訪問濟南立強模具有限公司!



        來源:http://www.lasagnafarm.com/ 日期:2021-09-28

        Injection mold is an indispensable part of injection molding. We introduced the design principles of cavity quantity, gate position, hot runner, assembly drawing and material selection of injection mold. Today we will continue to introduce the design of exhaust system of plastic injection mold.
        In addition to the original air in the cavity, the gas in the cavity also contains low molecular volatile gases produced by the heating or curing of injection molding materials. It is necessary to consider the sequential discharge of these gases. Generally speaking, for the mold with complex structure, it is difficult to estimate the accurate position of air lock in advance. Therefore, it is usually necessary to determine its position through die test, and then open the exhaust slot. The exhaust slot is usually opened where cavity Z is filled.
        The exhaust mode is to open the exhaust slot for exhaust by using the matching clearance of die parts.
        Exhaust is required for injection molding, and exhaust is required for injection mold demoulding. For deep cavity shell injection molding parts, after injection molding, the gas in the cavity is blown away. In the demoulding process, a vacuum is formed between the appearance of plastic parts and the appearance of core, which is difficult to demould. If forced demoulding, the injection molded parts are easy to deform or damage. Therefore, it is necessary to introduce air, that is, between the injection molded part and the core, so that the plastic injection molded part can be demoulded smoothly. At the same time, several shallow grooves are machined on the parting surface to facilitate exhaust.
        1.腔體和芯的模板需要使用錐形定位塊或精 密定位塊,該指南安裝在四個側面或模具周圍。
        1. The template of cavity and core needs to use conical positioning block or precision positioning block, and the guide is installed on four sides or around the mold.
        2. Flat pad or round pad shall be used for the contact surface between the a plate of the mold base and the reset rod to avoid damaging the a plate.
        3. The perforated part of the guide rail shall be inclined more than 2 degrees to avoid burrs and burrs. The perforated part shall not be of thin blade structure.
        4. In order to prevent dents on injection molded products, the width of stiffener shall be less than 50% of the wall thickness of the appearance surface (ideal value < 40%).
        5. The wall thickness of the product shall be the average value, and at least sudden change shall be considered to avoid dents.
        6. If the injection molded part is electroplated, the movable mold also needs polishing. Polishing requirements are second only to mirror polishing requirements to reduce the generation of cold materials in the forming process.
        7. Ribs and grooves in poorly ventilated cavities and cores must be embedded to avoid dissatisfaction and scorch marks.
        8. Inserts, inserts, etc. shall be positioned and fixed firmly, and the disc shall be provided with anti rotation measures. It is not allowed to pad copper and iron under the insert. If the welding pad is high, the welded part shall form a large surface contact and be ground flat.

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