Design and application of injection mold

1. Process analysis of plastic parts structure

It mainly discusses the design and process of the mold, and hopes to minimize the problems faced by these two aspects. The processability of the plastic part structure refers to the analysis of the shape and appearance quality of the plastic part, and whether it can meet the requirements of the molding process, which mainly includes geometric shape, surface roughness, dimensional accuracy, wall thickness, and molding. Hole distribution, uniformity and so on. Qualified products are inseparable from the foundation of good structural processability, and they are also a prerequisite for the smooth development of the injection molding process. Before the mold design, the plastic structure should be analyzed to ensure the molding process, and then the relevant design difficulty should be further explored. The production of plastics needs to be designed according to the requirements of use. In order to make the plastic parts meet the requirements, the performance characteristics of the plastics should be fully exerted, and then the structural processability should be considered. Under the premise that the use requirements are basically satisfied, the mold structure should be simplified as much as possible. Improve production efficiency and reduce production costs.

2. Mold structure design

In the injection molding process, it mainly includes filling, holding pressure, cooling and mold opening. The cooling and filling are carried out based on the mold casting system and the cooling system, which directly affect the molding quality of the plastic parts, the equipment requirements and the molding. cycle. Therefore, in the mold design, the design of the gating system and the cooling system is particularly critical, and at the same time, it is also the key to directly measuring whether the mold design can be successful. For large injection molds with long production cycles, high prices, and costly trials, the practical design of the gating system and the cooling system is more significant, and more problems need to be considered.

a pouring system design

In the injection mold, the pouring system bears both heat transfer and mass transfer. Whether the pouring system can be reasonably designed directly affects the flow state during filling, the difficulty of filling the mold, and whether the mold can be smoothly completed. Because the outer dimensions of the instrument panel itself are too large, the structure is relatively complicated, and it takes a long melt filling process. Therefore, it is easy to be difficult to fill in the injection molding process, or the filling is not uniform, directly to the plastic parts. The quality of the molding has an impact.

b cooling system design

In the injection molding process, most of the mold temperature is controlled by a cooling system, except that the pre-heat treatment is required at the beginning. In the cavity, the cooling time of the plastic product occupies 70%-80% of the entire cycle. The quality of the plastic parts is directly affected by the temperature of the mold cavity and the temperature uniformity. Therefore, whether the cooling system can be reasonably designed directly has a direct impact on the quality of the plastic parts and the production efficiency.

In general, in order to improve the mold design and the actual application technology level, it is necessary for the relevant workers in the mechanical industry to continuously summarize and explore in the actual work process, in order to eliminate the various types of defects encountered in the mold injection molding process. To lay a quality foundation for higher quality mold products in the future, so as to meet the development needs of the machinery industry.