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Exhaust design of mold in injection mold, exhaust design is essential, especially in fast Precision Injection molding. The exhaust design of precision injection mold is stricter. It is the exhaust of the cavity and gating system. It mainly includes the air in the cavity, the air in the runner, the vapor of the moisture in the plastic at high temperature and the volatile gas of the plastic raw materials of some additives. These gases must be discharged outside the mold in time to connect the mold cavity with the outside atmosphere. Moreover, the quality, molding cycle and production efficiency of plastic products will be affected. The function of exhaust design is not only to eliminate the air in the mold cavity and various gases generated in the heating process when the mold is injected with glue, but also to improve the product quality; It also improves the mold filling speed, shortens the molding cycle, reduces the injection pressure and injection time, improves the production efficiency, reduces the production cost, and reduces the energy consumption of the machine.
NJPE has strict design principles for the exhaust design of precision injection molds, which makes it have incomparable advantages over other injection mold factories. The following are the design principles of exhaust gas: 1. Exhaust gas by using the exhaust groove of parting surface; 2. Exhaust with thimble and push tube; 3, the use of inlay clearance and needle exhaust; 4, breathable steel exhaust; 5, exhaust insert exhaust. The matters needing attention when designing the exhaust of precision injection mold are as follows: 1. When the exhaust is difficult, the inlay structure must be adopted-if the dead angle of some molds is not easy to open the exhaust groove, first of all, the mold should be appropriately changed into a mosaic structure without affecting the appearance and precision of the product, which is not only beneficial to processing exhaust, but also can improve the original processing difficulty and facilitate maintenance. 2. In the closed shape of plastic products, Thimble should be added for exhaust to prevent burns and fusion marks. 3. For product molds with complex geometric shapes and the opening of exhaust tanks, CAE analysis results should be referred. 4. The thinner the product is, the farther away from the gate, the more important it is to open the exhaust tank. 5. Attention should be paid to the opening of exhaust tanks for small parts or precision parts, because it can not only avoid burns on the surface of products and insufficient injection volume, but also eliminate various defects of products.
Exhaust example: cold fan middle shell NJPE is a leading domestic precision injection mold processing factory, with advanced equipment capability, innovative research and development strength, strong financial strength and strong production capacity. Optimize precision injection mold products for customers free of charge, save customers’ expenses in the long run, and enter NJPE’s official website. https://www.njprecisionengineering.com/ learn more. Gating system design.