1575 KB64 KB199920252020Cîrţîna, LiviuGîrdu, Constantin CristinelMilesan, MihaelaRadulescu, Constanţaštevilka:2letnik:66str. 127-141ISSN:0039-2480COBISSID_HOST:17048347URN:URN:NBN:SI:doc-M7BT49L0enZveza strojnih inženirjev in tehnikov Slovenije etc.Strojniški vestnikanaliza ANOVAANOVA analysiscarbon dioxide laserhardnesshrapavostkerflaser cuttinglasersko rezanjeogljikov dioksid-laserrežaroughnesstrdotaMathematical modelling study of Hardox400 steel parts' roughness and hardness, cut with CO2 laser|This study supports the research in the field of laser cutting of steel sheets HARDOX400 (H400), a less well-known and analysed material. An H400 sheet with a thickness of 10 mm was used; a cutting plan was prepared according to Taguchi's method; the input parameters (laser power, assistant gas pressure and cutting speed) were varied according to a specific rule, producing nine pieces. The initial factorial experiment was replicated four times under the same conditions as the initial one. The values for the cutting width between the piece and the plate, the hardness, and the roughness of the 45 resulting pieces were measured. The results were interpreted for each measured parameter, and by using design of experiments (DOE) from the Statistics 7.0 software, we obtained the description of roughness (R sub a) in terms of power and speed using Response Surface Method (RSM) for prediction and correlation formulaTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo