Study of surface roughness in high speed milling of 1.7765 hard alloyed steel

High speed machining has many advantages such as increasing productivity, reducing production cost and improving final workpiece properties. On the other hand, final surface roughness is one of the most important of machined workpiece. In present study, relationship between high speed milling parameters and workpiece surface quality made of 1.7765 steel alloy and hardness of 50 HRC in presence of minimum quantity lubrication method was investigated. Cutting speed, feed rate and axial and radial cutting depth were studied and totally 30 experiments were done. Results showed that among main cutting parameters, feed rate and cutting speed had the most effect on surface roughness and surface roughness reduced with increasing cutting speed. In addition, using minimum quantity lubrication had a good performance in high cutting speed and cutting depth.