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Abstract: The design of the injection mold cooling system is not only related to the quality of the plastic parts but also related to the injection molding production efficiency. Due to the properties of the plastic used in the plastic part, the structure of the plastic part and the molding process parameters, the injection mold has different requirements for its cooling system. This paper describes the application of CAE (Moldflow) technology in the injection molding cooling system of plastic products (cup top cover) and carries out simulation analysis. According to the results of cooling analysis, the corresponding optimization scheme is proposed, and finally a good cooling effect is obtained.
Foreword
In injection molding, the mold temperature directly affects the quality of the plastic part (for example: warpage, shrinkage, stress crack resistance), the mold filling ability of the melt, the temperature of the melt, and the productivity of injection molding. By adjusting the temperature and maintaining the proper mold temperature, the deformation of the product can be reduced, the mechanical properties of the product can be enhanced, the surface quality of the product can be improved, and the dimensional accuracy of the product can be improved. At the same time, the cooling time of about 80% of the entire injection cycle is shortened, which will It is beneficial to increase the productivity of injection molding. Therefore, analyzing and optimizing the design of the cooling system of the injection molding mold is beneficial to the improvement of the quality of the plastic parts and the reduction of the production cost to a certain extent.
1 Factors affecting the cooling system
There are many factors that affect the injection mold cooling system. Such as the structural shape of the plastic part and the design of the parting surface, the type of cooling medium, temperature, flow rate, geometric parameters and spatial arrangement of the cooling pipe, mold material, melt temperature, ejection temperature required for plastic parts, mold temperature, plastic The thermal cycle interaction between the piece and the mold, cooling time, etc. For example, increasing the mold temperature increases the cooling time of the part, increases the shrinkage of the part, and warps after demolding. The molding cycle of the part is also prolonged by the increase of the cooling time, which reduces the productivity. On the other hand, the mold is lowered. The temperature, although shortening the cooling time and increasing the productivity, will reduce the flowability of the melt in the cavity, and cause the workpiece to generate large internal stress or form a defective defect such as a weld line. The length of the cooling time determines the temperature at which the part is demolded and the length of the molding cycle, which directly affects the cost and quality of the product.
Based on the analysis of the above various factors, and considering MPI/Cool provides the cooling pipeline (including the separator pipe, the jet pipe, the connecting hose), the insert, various mold materials, cold runners and hot runners, classification The ability of the surface and mold boundaries to simulate the cooling of the mold and product temperature provides a reliable basis for optimizing the design of the cooling system.
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