Automated air plasma cutting of Cu-ETP sheets

Prvi dio teorijskog dijela rada govori o tehnologiji plazma rezanja. Spomenuta je povijest plazma rezanja, princip rada, plazmeni plinovi, primjene u industrijskim granama, prednosti i nedostaci postupaka, postupci plazma rezanja i vrste industrijskih automatizacija rezanja plazmom. Opisan je proces plazma rezanja od uključenja struje do izlaska plazmenog mlaza prema radnom komadu. Opisuju se postupci plazma rezanja te njihov način rada, prednosti i nedostaci, vrste materijala rezanja, brzine rezanja i debljine rezanja materijala. Definirane su značajke korištenja određenih plinova kako bi odabir odgovarajućeg bio što bolji. Opisani su plazma rezači i sigurnosne mjere koje je potrebno ispuniti pri korištenju. U eksperimentalnom dijelu rada rezao se bakar plazma rezačem koji radi pomoću komprimiranog zraka te je opisan odabir plazma rezača, odabir kompresora i prednosti i nedostaci plazma rezanja pomoću komprimiranog zraka. Na kraju teorijskog dijela, opisan je bakar kao materijal. U eksperimentalnom dijelu izvršeno je rezanje te je mjerena hrapavost i ispitivala vlačna čvrstoća. Opisana je oprema koja se koristila kod rezanja bakra lima 3 mm. Različiti parametri brzine i jakosti struje kod rezanja bakra pokazuju različitost rezova dobivenih uzoraka. Uzorci su nakon plazma rezanja obrađeni strojnom obradom glodanja kako bi se dobili uzorci odgovarajućih oblika i dimenzija. Izmjerena je hrapavost svakog reza uzroka te su uzorci kasnije ispitani na kidalici, gdje je izmjerena vlačna čvrstoća materijala pored mjesta rezanja. Donesen je zaključak na temelju dobivenih rezultata.The first part of the theoretical section of the paper discusses plasma cutting technology. It mentions the history of plasma cutting, the working principle, plasma gases, applications in industrial sectors, advantages and disadvantages of the processes, plasma cutting procedures, and types of industrial plasma cutting automation. The process of plasma cutting is described from the activation of the current to the emergence of the plasma jet towards the workpiece. The plasma cutting procedures are described along with their modes of operation, advantages and disadvantages, types of cutting materials, cutting speeds, and material thicknesses. The characteristics of using specific gases are defined to improve the selection process. Plasma cutters are described, and safety measures to be followed during usage are outlined. In the experimental part of the study, copper was cut using a plasma cutter operating with compressed air. The selection of the plasma cutter, compressor choice, and the pros and cons of plasma cutting with compressed air are described. Towards the end of the theoretical section, copper is described as a material. In the experimental section, cutting was performed, and roughness was measured while tensile strength was tested. The equipment used for cutting 3mm copper sheet is described. Different parameters of speed and current intensity for cutting copper yield variations in the obtained samples. After plasma cutting, the samples were subjected to milling machining to achieve desired shapes and dimensions. The roughness of each cut sample was measured, and the samples were later tested on a tensile testing machine, where the tensile strength of the material adjacent to the cutting area was measured. A conclusion was drawn based on the obtained results