The influence of cutting parameters on the cut quality in cutting of aluminum alloy EN AW 1050A

U prvom dijelu diplomskog rada bit će opisan teorijski dio. U uvodu se govori generalno o toplinskim postupcima rezanja kao što su plazma rezanje, lasersko rezanje i plinsko rezanje, te njihovim prednostima, nedostacima itd . Nadalje će se obrazložiti plazma kao agregatno stanje te će detaljno biti opisan proces plazma rezanja pri korištenju različitih zaštitnih plinova. Nabrajaju se različiti načini izvođenja plazma rezanja te se opisuju najvažniji parametri da bi se dobila najveća kvaliteta plazma rezanja aluminija. Uza sve to, govoriti će se o automatizaciji plazma rezanja, kakvi CNC sustavi se koriste, kako je moguće robotizirati plazma rezanja uz različite senzore i softvere za programiranje. Na kraju teorijskog dijela opisuju se ručni plazma uređaji te plazma uređaj korišten u provođenju eksperimenta. Eksperimentalni dio pokazat će kakav utjecaj imaju parametri na kvalitetu rezne površine aluminija EN AW-1050A, debljine 3 mm, plazma rezanjem sa komprimiranim zrakom. Eksperiment se proveo na način da su se prvo izrezali uzorci različitim jakostima struje i brzinama rezanja, zatim su uzorci obrađeni te se vrši računalna analiza kako bi se ustanovio utjecaj različitih parametara prilikom plazma rezanja. Izrezano je devet uzoraka, jakostima struje 20 – 25 A te brzinama rezanja 50 – 90 cm/min. Analizom se mjeri kut nagiba brazdi i količina troske nastale tijekom rezanja. Na kraju rada odabrani su optimalni parametri jakosti struje i brzine rezanja te je donesen zaključak prema dobivenim rezultatima eksperimenta.The theoretical part will be described in the first part of the thesis. In the introduction, thermal cutting processes such as plasma cutting, laser cutting and autogenous cutting, their advantages, disadvantages, etc. are discussed in general. Furthermore, plasma as an aggregate state will be explained and the process of plasma cutting using different protective gases will be described in detail. Different ways of performing plasma cutting are listed and the most important parameters are described in order to obtain the highest quality plasma cutting of aluminum. In addition to all that, we will talk about the automation of plasma cutting, what kind of CNC systems are used, how it is possible to robotize plasma cutting with different sensors and programming software. At the end of the theoretical part, manual plasma devices are described and the plasma device is used in conducting experiment. The experimental part will show what influence the parameters have on the quality of the cutting surface of aluminum EN AW-1050A, 3 mm thick, by plasma cutting with air. The experiment was conducted in such a way that the samples were first cut with different current strengths and cutting speeds, then the samples were processed and a computer analysis was performed to determine the influence of different parameters during plasma cutting. Nine samples were cut, with currents of 20-25 A and cutting speeds of 50-90 cm/min. The analysis measures the angle of inclination of the furrows and the amount of slag produced during cutting. At the end, optimal parameters are taken for different current strengths and cutting speeds, and a conclusion is written according to the obtained results of the experiment