Multi-Objective Optimization of the Pneumatic Ejectors for Plastics Thin-wall Injected Parts

In this paper a modern multi-objective optimization of the pneumatic ejectors of the plastic injection mold ispresented. For this Pareto multi-objective optimization, two objective functions (volume and efficiency ofthe ejector) and four genes were taken into consideration and a set of twelve constraints were formulated.In solving the optimization problem we used an original two-phase evolutionary algorithm (2PhEA) inspiredfrom the concept of “punctuated equilibrium”. 2PhEA is implemented in Cambrian v.3.2 which is in operationat the Optimal Design Centre of the Technical University of Cluj-Napoca, Romania. The study on the individualsalong the obtained Pareto front reveals some important conclusions useful in the design of the pneumaticejectors.Keywords: optimal design, evolutionary algorithms, pneumatic ejector, injected part