ANALYSIS OF FORGING PRESS OPERATION AT METAL RAVNE

Cilj diplomske naloge je analizirati električne razmere med kovanjem na 40/45 MN hidravlični stiskalnici. Pri analizi se bomo osredotočili predvsem na moči in energije v času obratovanja stiskalnice. Pri analizi delovanja nas zanimajo predvsem realne razmere, katere nastajajo med delovanjem (kovanjem stiskalnice) ter razmere, pridobljene s pomočjo simulacije s programom Matlab. Realne razmere se spreminjajo zelo hitro, saj vsak cikel traja nekje od 2,5 do 3 s (čas, ko pehalo stiskalnice potuje iz zgornje točke v spodnjo ter znova v zgornjo), temu primerno pa se spreminjajo tudi obremenitve – od 30 do 125 % nazivnih. Iz izmerjenih vrednosti bomo določili velikost delovne, jalove moči ter tok za posamezen cikel. V sklepu diplomskega dela odgovorimo na vprašanje, ali je potrebna naprava za kompenzacijo jalove moči ter kakšne vrste kompenzacijska naprava bi bila najprimernejša za takšno vrsto obratovanja oziroma bremena.The diploma thesis focuses on the analysis of electrical conditions during forging on the 40/45 MN hydraulic press, in particular on powers and energy at the time of press operation. In the analysis of operation, we are especially interested in realistic conditions which develop during operation (press forging) and in the conditions obtained in a simulation with Matlab programme. In real operation conditions change very rapidly since each cycle takes about 2.5 to 3 seconds (time when press slide travels from top to bottom position and then upwards again). Adequately, loads change as well from 30 to 125 % nominal. Based on the obtained results the size of active and reactive powers and current in each cycle of operation is determined. The conclusion of diploma thesis provides answers to the question if a reactive power compensation device is required and what kind of compensation device would be most suitable for this type of operation and load