Plastic injection molding is a technique widely used in several areas of
industry, from aerospace to packaging, making up an important part of financial
transactions in Brazil. Variables such as injection time, cooling time, mold
temperature, machine temperature, injection speed, injection pressure, injection
point positioning are important for the process result. Thus, this work proposed
to study, through statistical analysis, the influence of the injection point positioning
on the result of the variables final temperature and final pressure of plastic
injection made by computational simulation. For this, Solidworks Plastics®
software was used for plastic injection simulation and Minitab for statistical
analysis. The results showed that the factorial design and the CCD methodology
achieve results in a regression analysis that are as satisfactory as a planning with
all possible combinations for the predictor variables. The injection point has a
greater influence on the final pressure response variable, and may also influence
the final temperature optimization results depending on the desired result. At the
end of the process, the pressure is higher near the injection point and lower the
further away from it, so the location of the PI has an influence on problems related
to settlement and stress accumulation when related to the final pressure
response variable.
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