Abstract
The method of building a mathematical model of fuzzy structure and the set of its rules, on the basis of experimental results is presented. The developed method is illustrated on the example of modelling the relationship of the transverse shrinkage of HDPE injection-moulded part (moulding) versus the shape of the moulding and the conditions of the injection moulding process. The developed shrinkage model can be helpful at the design stage of the moulding geometry, as well as mould cavity and the runner system. Due to the fuzzy structure, the model can be easily modified and generalised into similar moulding injection processes. It is also a good starting point for the optimisation of the process, aimed at compensating the shrinkage value in the entire volume of the moulding by adjusting the pressure profile in the holding phase of moulding injection cycle.
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