Abstract: To investigate the machinability of Inconel 718 alloy in dry end milling during laser cladding additive manufacturing,the laser cladding technique was used to coat Inconel 718 alloy on the surface of 27SiMn alloy steel. Orthogonal experimental design was employed to conduct dry end milling experiments and study the influence of milling process parameters on cutting forces and surface quality of the laser cladding layer. The research results indicate that milling depth has the most significant effect on cutting forces,and an increase in spindle speed,feed rate,and milling depth all lead to an increase in cutting forces. Among the milling process parameters,the feed rate has the most significant impact on surface roughness,followed by spindle speed,while the effect of milling depth is the smallest.The minimum surface roughness value was achieved when the spindle speed was set at 2 000 r/min,the feed rate was set at 150 mm/min,and the milling depth was set at 0.5 mm. Additionally,milling depth has the most significant influence on surface microhardness.These findings provide guidance and reference for process parameter selection in the mechanical machining process of laser cladded coatings.

Key words: laser cladding, dry milling, cutting force, surface topography, surface roughness, microhardness