Rad se bavi prijedlogom i teorijskim rješenjem za racionalizaciju proizvodnje dijelova kalupa za ubrizgavanje plastike rezanjem abrazivnim vodenim mlazom. Na temelju eksperimentalnih ispitivanja i primjenom napredne tehnologije abrazivnog vodenog mlaza u procesu proizvodnje kalupa za ubrizgavanje plastike, utvrđeno je da postoji mogućnost prilične uštede vremena, odnosno značajno smanjenje vremena proteklog od narudžbe do isporuke proizvoda. Na taj je način moguće povećati konkurentnost tvrtke i osigurati joj stabilnu poziciju na tržištu, čak i u vrijeme globalne krize. ; The article deals with a proposal and a theoretical solution for the rationalization of manufacturing of parts of plastic injection moulds by abrasive waterjet cutting. On the basis of experimental tests and by the application of advanced abrasive waterjet technology to the process of manufacturing of plastic injection moulds, it has been found that there is a possibility of considerable time saving, i.e. a marked shortage in time period from product ordering to dispatching. In such a way it is possible to increase the competitiveness of a company and to ensure its stable position on the market even in the time of global crisis.