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[ Mold News ] Requirements of injection mold design (Published:120-5-12)
The characteristics of the injection mold are determined by the characteristics of the raw materials. There are two main points: one is the filling flow characteristics of the plastic melt during injection, the other is the contraction position of the plastic during the cooling and solidification of the cavity. These two points determine the particularity of the injection mold and the difficulty of the design of the injection mold. Because the plastic melt belongs to viscoelastic body, the viscosity changes with the shear stress and shear rate when the melt flows. During the flow process, macromolecules produce orientation along the flow direction. After the mold cavity is filled, the melt is partially compressed. The shrinkage of the plastic during the cooling and curing process is very complex. The shrinkage of the plastic in each part and direction of the mold cavity is different. The shrinkage of the plastic of different types and brands is very different Different, the same brand of resin or plastic in processing, due to the different formula, its filling fluidity and shrinkage are also different. Based on the above characteristics, it is necessary to fully understand the characteristics of the processed plastic raw materials in the design of injection mold, so that the designed injection mold can be used reasonably, and the characteristics of plastic can be effectively used in the design process. Therefore, the following issues need to be considered in the design process of injection mold. 1. Analyze the structure and technical requirements of plastic parts. The structure of the plastic part determines the complexity of the injection mold structure, and the technical requirements of the plastic part (dimensional accuracy, surface roughness, etc.) determine the difficulty of the injection mold manufacturing and molding process. Therefore, for the special requirements that do not meet the plastic injection molding, unreasonable structure shape, etc., the improvement design scheme of the injection mold should be proposed, otherwise the injection mold design will be increased And manufacturing and injection molding process difficulties. 2. Familiar with technical specifications of injection molding machine. The technical specifications of injection molding machine restrict the size of injection mold and the range of injection products that can be molded. 3. Understand the processing and processing properties of plastics. Including the flow position of the plastic melt, the larger flow distance ratio that the melt can reach: analyze the flow resistance of the runner and the mold cavity, the exhaust of the original air in the mold cavity, the possible crystallization, orientation and the internal stress caused by the plastic in the injection mold, the cooling shrinkage and compensation of the plastic, the requirements of the plastic on the temperature of the injection mold, etc.
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