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Aiming at the residual stress of sprinkler body, simulation analysis of injection molding was carried out by using Moldex3D software. The process parameters in the molding process are taken as the control variables, and the 5 factors and 4 levels of process parameters are matched based on the orthogonal experimental method. The simulation data are processed, and the influence data of each factor on the residual stress are plotted. According to the influence of each factor on the residual stress, two times optimization, and finally get the best combination of process parameters. The calculated results show that the average flow residual stress is 0.141MPa, the average thermal residual stress is 0.276MPa. In actual production, the products formed by the combination of the process parameters have good quality after electroplating, which shows the practicability of the simulation analysis. Introduction The residual stress inevitably appears in the injection molding products[1], too large residual stress will not only affect the quality of the product, shorten the service life of the product, but also affect its subsequent processes, such as electroplating, spraying and so on. In the traditional product development process, it is sometimes difficult to consider and avoid the residual stress problem by experience, and the repeated verification and repair process also make the product development cycle longer and lower efficiency. In recent years, due to the continuous development of computer aided engineering analysis technology, more and more cases also verify the correctness of the injection molding simulation analysis and the effectiveness of solving the problem[2-6].Therefore, this paper carries on the simulation analysis to the residual stress of the sprinkler body in the production process. Orthogonal experimental method was used to select the technological conditions which had obvious influence on the residual stress of injection molding products, the orthogonal experimental matrix was constructed, and the process combination was simulated and analyzed. The injection molding process simulation and process optimization were carried out by using the flow analysis software Moldex3D, and the optimal process parameters combination was obtained. Modeling The sprinkler body model is shown in Figure 1.it’s size is 247 mm long, 46 mm wide and 101 mm high. It’s material grade is ABS727. It’s average thickness is 2.637mm. The entry way is head column, horn gate. one mold with two cavities.

Simulation Analysis to Optimize the Parameters of Injection Molding Process to Improve the Residual Stress of Sprinkler Body