THE USE OF NORMALIZATION IN THE PRODUCTION OF FORGED PARTS

Tema ovog završnog rada je postupak primjena toplinske obrade kovanog dijela (vilica sa batićem), koja čini sastavni dio lanaca dalekovodnih stupova preko kojih se prenosi električna energija. Predmet rada je proizvod tvtke Unidal d.o.o. za proizvodnju otkivaka. Za izradu „vilice sa batićem “ potrebno je nakon provedbe određenih tehnološki operacija (sječenje, zagrijavanje na temperaturu kovanja, kovanje i obrezivanja) provesti i operaciju toplinske obrade normalizacije, u svrhu smanjenja naprezanja i dobivanja finije strukture materijala, čime se postižu i bolja mehanička svojstva proizvoda. Normalizacija se provodi tako da se materijal zagrije na temperaturu 840°-870°C, drži na toj temperaturi neko vrijeme i zatim hladi (na zraku, pomoću ventilatora ili puštanjem zajedno s peći da se ohladi).Subject of this final thesis is a procedure of applying heat treatment to forged piece (fork with a bat), which is a part of a chain of transmission poles that are used to transfer electical energy. Object of the paper is a product of the company "Unidal d.o.o. za proizvodnju otkivaka". For the production of "fork with a bat" is necessary, after making a few tehnical operations (cutting, heating to a temperature level for forging, forging, final cutting), to carry out the operation of heating process (normalization). That is important because of the strain reduction and getting a finer structure of the material, which improves mecanical performances of the product. Normalization is done by heating the material to 840 C – 870°C, holding it for a while and than cooling it ( air cooled, cooled by fan, letting it cool down together with a furnace)