DEFINING OF MATHEMATICAL MODELS IN HIGH-ALLOYED STEEL CO2 LASER CUTTING
This paper defines mathematical models during laser cutting that describe effects of certain processing regime parameters on values for surface roughness Ra and for width of heat affected zone HAZ. Cutting of high-alloyed steel 1.4864 (X13CrNiSi35-16), with thickness of s = 3 mm and 1.4541 (X6CrNiTi18-10), with thickness of s = 4 mm was performed by laser cutting using O2 and N2 as the assistance gas. For the definition of appropriate mathematical models, multiple linear regression analysis is used, with four independent variables that were varied at five levels. Following most influential cutting parameters were varied: cutting speed (V), assist gas pressure (p), focus position (fs) and stand-off (Nd). It is possible to sufficiently describe the effects of process parameters, with defined models in reliable way, on product quality and also to determine the best parameters of laser cutting of investigated high-alloyed steels.