关键词: 高温合金, 小孔, 螺旋铣削, 切削力, 切削温度, 表面粗糙度

Abstract: Superalloys have good high temperature resistance,oxidation resistance and corrosion resistance,which are widely used in aerospace,energy,and other fields. However,due to their high tensile strength,low thermal conductivity,large resistance to plastic deformation during cutting,serious cutting heat agglomeration and work hardening,superalloys are considered difficult-to-machine materials,so it is challenging to make small holes on superalloy by cutting. The small hole machining of GH605 cobalt-based superalloy was carried out by means of helical milling.The orthogonal experiment of micro helical milling was designed and carried out to explore the influence of key milling parameters (spindle speed n,feed speed v_f,and pitch s) on cutting force F,cutting temperature T and surface roughness Ra of hole wall. Based on the range analysis results of the experimental data,the appropriate cutting parameters were selected,and the micro helical milling of straight holes and inclined holes were successfully carried out.

Key words: superalloy, small hole, helical milling, cutting force, cutting temperature, surface roughness