Grinding of Fir Tree Slots of Powder Metallurgy Superalloy FGH96 using Profiled Electroplated CBN Wheel

Abstract

\n Broaching is commonly used for machining fir tree slots on turbine disk, which has outstandingadvantages and disadvantages, such as high quality machined surface, high manufacturing accuracy and highproductivity as well as fa st tool wear, extremely high processing costs and long preparation time, poor processflexibility. Utilizing the electroplated cubic boron nitride (CBN) profiled grinding wheels and single sided localprofiled grinding process, the experiments of FGH96 tur bine disk slots are carried out. The results show that thehigh precision of slot profile can be achieved by the developed process. Using the given experimental parametersn =48000 rpm, a p =0.002 mm, v f =100 mm/min and 600# electroplated CBN profiled wheel, the profile error ofFGH96 slots is within ±0.012 mm, and the grinding surface roughness is less than Ra0.8 μm. After four whole slotsare machined completely, the grinding wheel still has grinding capability, which proves that 600 # electroplatedCBN prof iled wheel can meet the grinding needs of FGH96 turbine disk slots.