MAKING A TOOTHED WHEEL BY MILLING PROCESSES

U ovom je radu detaljno razrađena konstrukcija, ali i analizirana sama izrada sklopa nazubljenog kola kakvo se često koristi u strojarnicama hidroelektrana u cilju mjerenja brzina vrtnje rotacionih elemenata sklopa turbine i generatora. Takvo se mjerenje vrši za različite svrhe, no izdvaja se ona najbitnija – za svrhu sigurnosnog sustava turbine, tj. za njenu zaštitu od prekomjernog povećanja brzina vrtnje. To se još naziva i zaštitom od nadbrzine ili pobjega čija su dva sustava (elektro i mehaničko-hidraulički) ovdje opisani. Kako je vidljivo iz naslova da je naglasak stavljen na procese glodanja prilikom izrade, rad se dotakao i njegovog teorijskog dijela, odnosno njegove međusobne podijele i karakteristike, a sve je to potkrijepljeno nizom slika i primjera za lakše razumijevanje i vizualiziranje pojedinih postupaka. Tehnološkom se pak pripremom proizvodnje nazubljenog kola prolazi kroz sve faze projektiranja tehnološkog procesa te se objašnjavaju najvažniji režimi obrade (tj. parametri obrade), a nakon toga je ukratko prikazana i sama izrada njegove pozicije u programu „SolidWorks“ s nadogradnjom „CamWorks“. Rad završava proračunom opruge (pri djelovanju centripetalne sile) kako bi ju mogli ispravno dimenzionirati, a sve to za uspješno razrađenu konstrukciju i funkcioniranje sklopa s mehanički aktiviranim hidrauličkim ventilom. U PRILOZIMA se nalazi detaljno razrađena konstrukcija nazubljenog kola. Ti nacrti, kao i nekolicina drugih unutar završnog rada, napravljeni su pomoću programa SolidWorks za 3D, odnosno AutoCAD za 2D modele.In this paper, the construction is elaborated in detail, but also the production of the toothed wheel assembly, which is often used in hydroelectric power plant engine rooms, is analyzed in order to measure the rotational speeds of the rotating elements of the turbine and generator assembly. Such measurement is performed for various purposes, but the most important one is singled out - for the purpose of the turbine safety system, ie to protect it from excessive speed. This is also called overspeed or escape protection, whose two systems (electrical and mechanicalhydraulic) are described here. As can be seen from the title that the emphasis is placed on milling processes during production, the paper also touched on its theoretical part, ie its mutual divisions and characteristics, all supported by a series of images and examples to facilitate understanding and visualization of individual procedures. The technological preparation of the production of the toothed wheel goes through all phases of designing the technological process and explains the most important speeds and feeds (ie cutting speed and feed rate), and then briefly shows the creation of its position in the software "SolidWorks" with the upgrade of "CamWorks". The work ends with the calculation of the spring (under the action of centripetal force) so that it can be properly dimensioned, all for the successfully developed construction and operation of the assembly with a mechanically activated hydraulic valve. In the attachments there is a detailed construction of the toothed wheel. These drawings, as well as several others within the final work, were made using softwares like SolidWorks for 3D and AutoCAD for 2D models