Renewed selection of a material in manufacturing

U radu su dani ograničavajući kriteriji izbora materijala i tehnologije proizvodnje radnog predmeta. Posebno je naglašen utjecaj veličine serije na taj izbor. Istaknuti su kriteriji reizbora materijala i tehnološkog postupka koji su detaljnije razmatrani u ovom magistarskom radu. Izabrani kriteriji su kvalitativnog i kvantitativnog karaktera pa je za definiranje modela izbora optimalne varijante, u danom trenutku, primjenjena metoda težinskih svojstava. Dobivenim modelom provedeno je vrednovanje različitih varijanti materijala i tehnoloških postupaka na primjeru spojnice (cijevnog nastavka). Prikazan je dijagram toka izbora optimalne varijante zamjenskog materijala i tehnološkog postupka u okviru integralnog informacijskog sustava, na osnovi kojeg je definiran model podataka (Entity Relationship Model - ERM dijagram tablični prikaz entiteta).Limiting criteria for the selection of material and manufacturing technology of a workpiece are presented in the work. Special emphasis is given to the effect of the series size to this selection. The criteria for a renewed selection of a material and technological process are pointed out and analysed in more detail. The chosen criteria referring to quality and quantity, the method of weight properties has been applied to define the model for the selection of the optimum variant, at a given instant. The obtained model has been tested on a fitting (pipe fitting) to evaluate the various variants of materials and technological processes. The flow process chart depicting the selection of replacement material and technological process optimum variant within an integral information system has men shown. The definition of the data model has been based upon it (Entity-Relationship Model - ERM chart and tabular display of entity)